diff --git a/.env.example b/.env.example
index 9864a41482..a6ff6157ce 100644
--- a/.env.example
+++ b/.env.example
@@ -47,6 +47,10 @@ TRUST_PROXY=1
 # password policies.
 # MIN_PASSWORD_LENGTH=8
 
+# When enabled, the app will continue running after encountering uncaught exceptions
+# instead of exiting the process. Not recommended for production unless necessary.
+# CONTINUE_ON_UNCAUGHT_EXCEPTION=false
+
 #===============#
 # JSON Logging  #
 #===============#
@@ -87,6 +91,16 @@ NODE_MAX_OLD_SPACE_SIZE=6144
 
 # CONFIG_PATH="/alternative/path/to/librechat.yaml"
 
+#==================#
+# Langfuse Tracing #
+#==================#
+
+# Get Langfuse API keys for your project from the project settings page: https://cloud.langfuse.com
+
+# LANGFUSE_PUBLIC_KEY=
+# LANGFUSE_SECRET_KEY=
+# LANGFUSE_BASE_URL=
+
 #===================================================#
 #                     Endpoints                     #
 #===================================================#
@@ -121,7 +135,7 @@ PROXY=
 #============#
 
 ANTHROPIC_API_KEY=user_provided
-# ANTHROPIC_MODELS=claude-opus-4-20250514,claude-sonnet-4-20250514,claude-3-7-sonnet-20250219,claude-3-5-sonnet-20241022,claude-3-5-haiku-20241022,claude-3-opus-20240229,claude-3-sonnet-20240229,claude-3-haiku-20240307
+# ANTHROPIC_MODELS=claude-sonnet-4-6,claude-opus-4-6,claude-opus-4-20250514,claude-sonnet-4-20250514,claude-3-7-sonnet-20250219,claude-3-5-sonnet-20241022,claude-3-5-haiku-20241022,claude-3-opus-20240229,claude-3-sonnet-20240229,claude-3-haiku-20240307
 # ANTHROPIC_REVERSE_PROXY=
 
 # Set to true to use Anthropic models through Google Vertex AI instead of direct API
@@ -156,7 +170,8 @@ ANTHROPIC_API_KEY=user_provided
 # BEDROCK_AWS_SESSION_TOKEN=someSessionToken
 
 # Note: This example list is not meant to be exhaustive. If omitted, all known, supported model IDs will be included for you.
-# BEDROCK_AWS_MODELS=anthropic.claude-3-5-sonnet-20240620-v1:0,meta.llama3-1-8b-instruct-v1:0
+# BEDROCK_AWS_MODELS=anthropic.claude-sonnet-4-6,anthropic.claude-opus-4-6-v1,anthropic.claude-3-5-sonnet-20240620-v1:0,meta.llama3-1-8b-instruct-v1:0
+# Cross-region inference model IDs: us.anthropic.claude-sonnet-4-6,us.anthropic.claude-opus-4-6-v1,global.anthropic.claude-opus-4-6-v1
 
 # See all Bedrock model IDs here: https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids.html#model-ids-arns
 
@@ -737,8 +752,10 @@ HELP_AND_FAQ_URL=https://librechat.ai
 # REDIS_PING_INTERVAL=300
 
 # Force specific cache namespaces to use in-memory storage even when Redis is enabled
-# Comma-separated list of CacheKeys (e.g., ROLES,MESSAGES)
-# FORCED_IN_MEMORY_CACHE_NAMESPACES=ROLES,MESSAGES
+# Comma-separated list of CacheKeys
+# Defaults to CONFIG_STORE,APP_CONFIG so YAML-derived config stays per-container (safe for blue/green deployments)
+# Set to empty string to force all namespaces through Redis: FORCED_IN_MEMORY_CACHE_NAMESPACES=
+# FORCED_IN_MEMORY_CACHE_NAMESPACES=CONFIG_STORE,APP_CONFIG
 
 # Leader Election Configuration (for multi-instance deployments with Redis)
 # Duration in seconds that the leader lease is valid before it expires (default: 25)
diff --git a/.gitignore b/.gitignore
index d173d26b60..86d4a3ddae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@ pids
 
 # CI/CD data
 test-image*
+dump.rdb
 
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov
@@ -29,6 +30,9 @@ coverage
 config/translations/stores/*
 client/src/localization/languages/*_missing_keys.json
 
+# Turborepo
+.turbo
+
 # Compiled Dirs (http://nodejs.org/api/addons.html)
 build/
 dist/
diff --git a/Dockerfile b/Dockerfile
index 5872440a33..38273bc5eb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# v0.8.2-rc2
+# v0.8.2
 
 # Base node image
 FROM node:20-alpine AS node
diff --git a/Dockerfile.multi b/Dockerfile.multi
index ca66459a44..47e00d0fa8 100644
--- a/Dockerfile.multi
+++ b/Dockerfile.multi
@@ -1,5 +1,5 @@
 # Dockerfile.multi
-# v0.8.2-rc2
+# v0.8.2
 
 # Set configurable max-old-space-size with default
 ARG NODE_MAX_OLD_SPACE_SIZE=6144
diff --git a/README.md b/README.md
index a96e47f70f..6e04396637 100644
--- a/README.md
+++ b/README.md
@@ -109,6 +109,11 @@
 - 🎨 **Customizable Interface**:  
   - Customizable Dropdown & Interface that adapts to both power users and newcomers
 
+- 🌊 **[Resumable Streams](https://www.librechat.ai/docs/features/resumable_streams)**:  
+  - Never lose a response: AI responses automatically reconnect and resume if your connection drops
+  - Multi-Tab & Multi-Device Sync: Open the same chat in multiple tabs or pick up on another device
+  - Production-Ready: Works from single-server setups to horizontally scaled deployments with Redis
+
 - 🗣️ **Speech & Audio**:  
   - Chat hands-free with Speech-to-Text and Text-to-Speech  
   - Automatically send and play Audio  
@@ -137,13 +142,11 @@
 
 ## 🪶 All-In-One AI Conversations with LibreChat
 
-LibreChat brings together the future of assistant AIs with the revolutionary technology of OpenAI's ChatGPT. Celebrating the original styling, LibreChat gives you the ability to integrate multiple AI models. It also integrates and enhances original client features such as conversation and message search, prompt templates and plugins.
+LibreChat is a self-hosted AI chat platform that unifies all major AI providers in a single, privacy-focused interface.
 
-With LibreChat, you no longer need to opt for ChatGPT Plus and can instead use free or pay-per-call APIs. We welcome contributions, cloning, and forking to enhance the capabilities of this advanced chatbot platform.
+Beyond chat, LibreChat provides AI Agents, Model Context Protocol (MCP) support, Artifacts, Code Interpreter, custom actions, conversation search, and enterprise-ready multi-user authentication.
 
-[![Watch the video](https://raw.githubusercontent.com/LibreChat-AI/librechat.ai/main/public/images/changelog/v0.7.6.gif)](https://www.youtube.com/watch?v=ilfwGQtJNlI)
-
-Click on the thumbnail to open the video☝️
+Open source, actively developed, and built for anyone who values control over their AI infrastructure.
 
 ---
 
diff --git a/api/app/clients/specs/BaseClient.test.js b/api/app/clients/specs/BaseClient.test.js
index 3cc082ab66..fed80de28c 100644
--- a/api/app/clients/specs/BaseClient.test.js
+++ b/api/app/clients/specs/BaseClient.test.js
@@ -41,9 +41,9 @@ jest.mock('~/models', () => ({
 const { getConvo, saveConvo } = require('~/models');
 
 jest.mock('@librechat/agents', () => {
-  const { Providers } = jest.requireActual('@librechat/agents');
+  const actual = jest.requireActual('@librechat/agents');
   return {
-    Providers,
+    ...actual,
     ChatOpenAI: jest.fn().mockImplementation(() => {
       return {};
     }),
diff --git a/api/app/clients/tools/manifest.json b/api/app/clients/tools/manifest.json
index 9262113501..7930e67ac9 100644
--- a/api/app/clients/tools/manifest.json
+++ b/api/app/clients/tools/manifest.json
@@ -57,19 +57,6 @@
       }
     ]
   },
-  {
-    "name": "Browser",
-    "pluginKey": "web-browser",
-    "description": "Scrape and summarize webpage data",
-    "icon": "assets/web-browser.svg",
-    "authConfig": [
-      {
-        "authField": "OPENAI_API_KEY",
-        "label": "OpenAI API Key",
-        "description": "Browser makes use of OpenAI embeddings"
-      }
-    ]
-  },
   {
     "name": "DALL-E-3",
     "pluginKey": "dalle",
diff --git a/api/app/clients/tools/structured/AzureAISearch.js b/api/app/clients/tools/structured/AzureAISearch.js
index 55af3cdff5..1815c45e04 100644
--- a/api/app/clients/tools/structured/AzureAISearch.js
+++ b/api/app/clients/tools/structured/AzureAISearch.js
@@ -1,14 +1,28 @@
-const { z } = require('zod');
 const { Tool } = require('@langchain/core/tools');
 const { logger } = require('@librechat/data-schemas');
 const { SearchClient, AzureKeyCredential } = require('@azure/search-documents');
 
+const azureAISearchJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      description: 'Search word or phrase to Azure AI Search',
+    },
+  },
+  required: ['query'],
+};
+
 class AzureAISearch extends Tool {
   // Constants for default values
   static DEFAULT_API_VERSION = '2023-11-01';
   static DEFAULT_QUERY_TYPE = 'simple';
   static DEFAULT_TOP = 5;
 
+  static get jsonSchema() {
+    return azureAISearchJsonSchema;
+  }
+
   // Helper function for initializing properties
   _initializeField(field, envVar, defaultValue) {
     return field || process.env[envVar] || defaultValue;
@@ -22,10 +36,7 @@ class AzureAISearch extends Tool {
     /* Used to initialize the Tool without necessary variables. */
     this.override = fields.override ?? false;
 
-    // Define schema
-    this.schema = z.object({
-      query: z.string().describe('Search word or phrase to Azure AI Search'),
-    });
+    this.schema = azureAISearchJsonSchema;
 
     // Initialize properties using helper function
     this.serviceEndpoint = this._initializeField(
diff --git a/api/app/clients/tools/structured/DALLE3.js b/api/app/clients/tools/structured/DALLE3.js
index c44b56f83d..26610f73ba 100644
--- a/api/app/clients/tools/structured/DALLE3.js
+++ b/api/app/clients/tools/structured/DALLE3.js
@@ -1,4 +1,3 @@
-const { z } = require('zod');
 const path = require('path');
 const OpenAI = require('openai');
 const { v4: uuidv4 } = require('uuid');
@@ -8,6 +7,36 @@ const { logger } = require('@librechat/data-schemas');
 const { getImageBasename, extractBaseURL } = require('@librechat/api');
 const { FileContext, ContentTypes } = require('librechat-data-provider');
 
+const dalle3JsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      maxLength: 4000,
+      description:
+        'A text description of the desired image, following the rules, up to 4000 characters.',
+    },
+    style: {
+      type: 'string',
+      enum: ['vivid', 'natural'],
+      description:
+        'Must be one of `vivid` or `natural`. `vivid` generates hyper-real and dramatic images, `natural` produces more natural, less hyper-real looking images',
+    },
+    quality: {
+      type: 'string',
+      enum: ['hd', 'standard'],
+      description: 'The quality of the generated image. Only `hd` and `standard` are supported.',
+    },
+    size: {
+      type: 'string',
+      enum: ['1024x1024', '1792x1024', '1024x1792'],
+      description:
+        'The size of the requested image. Use 1024x1024 (square) as the default, 1792x1024 if the user requests a wide image, and 1024x1792 for full-body portraits. Always include this parameter in the request.',
+    },
+  },
+  required: ['prompt', 'style', 'quality', 'size'],
+};
+
 const displayMessage =
   "DALL-E displayed an image. All generated images are already plainly visible, so don't repeat the descriptions in detail. Do not list download links as they are available in the UI already. The user may download the images by clicking on them, but do not mention anything about downloading to the user.";
 class DALLE3 extends Tool {
@@ -72,27 +101,11 @@ class DALLE3 extends Tool {
     // The prompt must intricately describe every part of the image in concrete, objective detail. THINK about what the end goal of the description is, and extrapolate that to what would make satisfying images.
     // All descriptions sent to dalle should be a paragraph of text that is extremely descriptive and detailed. Each should be more than 3 sentences long.
     // - The "vivid" style is HIGHLY preferred, but "natural" is also supported.`;
-    this.schema = z.object({
-      prompt: z
-        .string()
-        .max(4000)
-        .describe(
-          'A text description of the desired image, following the rules, up to 4000 characters.',
-        ),
-      style: z
-        .enum(['vivid', 'natural'])
-        .describe(
-          'Must be one of `vivid` or `natural`. `vivid` generates hyper-real and dramatic images, `natural` produces more natural, less hyper-real looking images',
-        ),
-      quality: z
-        .enum(['hd', 'standard'])
-        .describe('The quality of the generated image. Only `hd` and `standard` are supported.'),
-      size: z
-        .enum(['1024x1024', '1792x1024', '1024x1792'])
-        .describe(
-          'The size of the requested image. Use 1024x1024 (square) as the default, 1792x1024 if the user requests a wide image, and 1024x1792 for full-body portraits. Always include this parameter in the request.',
-        ),
-    });
+    this.schema = dalle3JsonSchema;
+  }
+
+  static get jsonSchema() {
+    return dalle3JsonSchema;
   }
 
   getApiKey() {
diff --git a/api/app/clients/tools/structured/FluxAPI.js b/api/app/clients/tools/structured/FluxAPI.js
index 9fa08a0343..56f86a707d 100644
--- a/api/app/clients/tools/structured/FluxAPI.js
+++ b/api/app/clients/tools/structured/FluxAPI.js
@@ -1,4 +1,3 @@
-const { z } = require('zod');
 const axios = require('axios');
 const fetch = require('node-fetch');
 const { v4: uuidv4 } = require('uuid');
@@ -7,6 +6,84 @@ const { logger } = require('@librechat/data-schemas');
 const { HttpsProxyAgent } = require('https-proxy-agent');
 const { FileContext, ContentTypes } = require('librechat-data-provider');
 
+const fluxApiJsonSchema = {
+  type: 'object',
+  properties: {
+    action: {
+      type: 'string',
+      enum: ['generate', 'list_finetunes', 'generate_finetuned'],
+      description:
+        'Action to perform: "generate" for image generation, "generate_finetuned" for finetuned model generation, "list_finetunes" to get available custom models',
+    },
+    prompt: {
+      type: 'string',
+      description:
+        'Text prompt for image generation. Required when action is "generate". Not used for list_finetunes.',
+    },
+    width: {
+      type: 'number',
+      description:
+        'Width of the generated image in pixels. Must be a multiple of 32. Default is 1024.',
+    },
+    height: {
+      type: 'number',
+      description:
+        'Height of the generated image in pixels. Must be a multiple of 32. Default is 768.',
+    },
+    prompt_upsampling: {
+      type: 'boolean',
+      description: 'Whether to perform upsampling on the prompt.',
+    },
+    steps: {
+      type: 'integer',
+      description: 'Number of steps to run the model for, a number from 1 to 50. Default is 40.',
+    },
+    seed: {
+      type: 'number',
+      description: 'Optional seed for reproducibility.',
+    },
+    safety_tolerance: {
+      type: 'number',
+      description:
+        'Tolerance level for input and output moderation. Between 0 and 6, 0 being most strict, 6 being least strict.',
+    },
+    endpoint: {
+      type: 'string',
+      enum: [
+        '/v1/flux-pro-1.1',
+        '/v1/flux-pro',
+        '/v1/flux-dev',
+        '/v1/flux-pro-1.1-ultra',
+        '/v1/flux-pro-finetuned',
+        '/v1/flux-pro-1.1-ultra-finetuned',
+      ],
+      description: 'Endpoint to use for image generation.',
+    },
+    raw: {
+      type: 'boolean',
+      description:
+        'Generate less processed, more natural-looking images. Only works for /v1/flux-pro-1.1-ultra.',
+    },
+    finetune_id: {
+      type: 'string',
+      description: 'ID of the finetuned model to use',
+    },
+    finetune_strength: {
+      type: 'number',
+      description: 'Strength of the finetuning effect (typically between 0.1 and 1.2)',
+    },
+    guidance: {
+      type: 'number',
+      description: 'Guidance scale for finetuned models',
+    },
+    aspect_ratio: {
+      type: 'string',
+      description: 'Aspect ratio for ultra models (e.g., "16:9")',
+    },
+  },
+  required: [],
+};
+
 const displayMessage =
   "Flux displayed an image. All generated images are already plainly visible, so don't repeat the descriptions in detail. Do not list download links as they are available in the UI already. The user may download the images by clicking on them, but do not mention anything about downloading to the user.";
 
@@ -57,82 +134,11 @@ class FluxAPI extends Tool {
     // Add base URL from environment variable with fallback
     this.baseUrl = process.env.FLUX_API_BASE_URL || 'https://api.us1.bfl.ai';
 
-    // Define the schema for structured input
-    this.schema = z.object({
-      action: z
-        .enum(['generate', 'list_finetunes', 'generate_finetuned'])
-        .default('generate')
-        .describe(
-          'Action to perform: "generate" for image generation, "generate_finetuned" for finetuned model generation, "list_finetunes" to get available custom models',
-        ),
-      prompt: z
-        .string()
-        .optional()
-        .describe(
-          'Text prompt for image generation. Required when action is "generate". Not used for list_finetunes.',
-        ),
-      width: z
-        .number()
-        .optional()
-        .describe(
-          'Width of the generated image in pixels. Must be a multiple of 32. Default is 1024.',
-        ),
-      height: z
-        .number()
-        .optional()
-        .describe(
-          'Height of the generated image in pixels. Must be a multiple of 32. Default is 768.',
-        ),
-      prompt_upsampling: z
-        .boolean()
-        .optional()
-        .default(false)
-        .describe('Whether to perform upsampling on the prompt.'),
-      steps: z
-        .number()
-        .int()
-        .optional()
-        .describe('Number of steps to run the model for, a number from 1 to 50. Default is 40.'),
-      seed: z.number().optional().describe('Optional seed for reproducibility.'),
-      safety_tolerance: z
-        .number()
-        .optional()
-        .default(6)
-        .describe(
-          'Tolerance level for input and output moderation. Between 0 and 6, 0 being most strict, 6 being least strict.',
-        ),
-      endpoint: z
-        .enum([
-          '/v1/flux-pro-1.1',
-          '/v1/flux-pro',
-          '/v1/flux-dev',
-          '/v1/flux-pro-1.1-ultra',
-          '/v1/flux-pro-finetuned',
-          '/v1/flux-pro-1.1-ultra-finetuned',
-        ])
-        .optional()
-        .default('/v1/flux-pro-1.1')
-        .describe('Endpoint to use for image generation.'),
-      raw: z
-        .boolean()
-        .optional()
-        .default(false)
-        .describe(
-          'Generate less processed, more natural-looking images. Only works for /v1/flux-pro-1.1-ultra.',
-        ),
-      finetune_id: z.string().optional().describe('ID of the finetuned model to use'),
-      finetune_strength: z
-        .number()
-        .optional()
-        .default(1.1)
-        .describe('Strength of the finetuning effect (typically between 0.1 and 1.2)'),
-      guidance: z.number().optional().default(2.5).describe('Guidance scale for finetuned models'),
-      aspect_ratio: z
-        .string()
-        .optional()
-        .default('16:9')
-        .describe('Aspect ratio for ultra models (e.g., "16:9")'),
-    });
+    this.schema = fluxApiJsonSchema;
+  }
+
+  static get jsonSchema() {
+    return fluxApiJsonSchema;
   }
 
   getAxiosConfig() {
diff --git a/api/app/clients/tools/structured/GoogleSearch.js b/api/app/clients/tools/structured/GoogleSearch.js
index d703d56f83..38f483edf1 100644
--- a/api/app/clients/tools/structured/GoogleSearch.js
+++ b/api/app/clients/tools/structured/GoogleSearch.js
@@ -1,12 +1,33 @@
-const { z } = require('zod');
 const { Tool } = require('@langchain/core/tools');
 const { getEnvironmentVariable } = require('@langchain/core/utils/env');
 
+const googleSearchJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      minLength: 1,
+      description: 'The search query string.',
+    },
+    max_results: {
+      type: 'integer',
+      minimum: 1,
+      maximum: 10,
+      description: 'The maximum number of search results to return. Defaults to 5.',
+    },
+  },
+  required: ['query'],
+};
+
 class GoogleSearchResults extends Tool {
   static lc_name() {
     return 'google';
   }
 
+  static get jsonSchema() {
+    return googleSearchJsonSchema;
+  }
+
   constructor(fields = {}) {
     super(fields);
     this.name = 'google';
@@ -28,25 +49,11 @@ class GoogleSearchResults extends Tool {
     this.description =
       'A search engine optimized for comprehensive, accurate, and trusted results. Useful for when you need to answer questions about current events.';
 
-    this.schema = z.object({
-      query: z.string().min(1).describe('The search query string.'),
-      max_results: z
-        .number()
-        .min(1)
-        .max(10)
-        .optional()
-        .describe('The maximum number of search results to return. Defaults to 10.'),
-      // Note: Google API has its own parameters for search customization, adjust as needed.
-    });
+    this.schema = googleSearchJsonSchema;
   }
 
   async _call(input) {
-    const validationResult = this.schema.safeParse(input);
-    if (!validationResult.success) {
-      throw new Error(`Validation failed: ${JSON.stringify(validationResult.error.issues)}`);
-    }
-
-    const { query, max_results = 5 } = validationResult.data;
+    const { query, max_results = 5 } = input;
 
     const response = await fetch(
       `https://www.googleapis.com/customsearch/v1?key=${this.apiKey}&cx=${
diff --git a/api/app/clients/tools/structured/OpenWeather.js b/api/app/clients/tools/structured/OpenWeather.js
index f92fe522ce..38e2b9133c 100644
--- a/api/app/clients/tools/structured/OpenWeather.js
+++ b/api/app/clients/tools/structured/OpenWeather.js
@@ -1,8 +1,52 @@
 const { Tool } = require('@langchain/core/tools');
-const { z } = require('zod');
 const { getEnvironmentVariable } = require('@langchain/core/utils/env');
 const fetch = require('node-fetch');
 
+const openWeatherJsonSchema = {
+  type: 'object',
+  properties: {
+    action: {
+      type: 'string',
+      enum: ['help', 'current_forecast', 'timestamp', 'daily_aggregation', 'overview'],
+      description: 'The action to perform',
+    },
+    city: {
+      type: 'string',
+      description: 'City name for geocoding if lat/lon not provided',
+    },
+    lat: {
+      type: 'number',
+      description: 'Latitude coordinate',
+    },
+    lon: {
+      type: 'number',
+      description: 'Longitude coordinate',
+    },
+    exclude: {
+      type: 'string',
+      description: 'Parts to exclude from the response',
+    },
+    units: {
+      type: 'string',
+      enum: ['Celsius', 'Kelvin', 'Fahrenheit'],
+      description: 'Temperature units',
+    },
+    lang: {
+      type: 'string',
+      description: 'Language code',
+    },
+    date: {
+      type: 'string',
+      description: 'Date in YYYY-MM-DD format for timestamp and daily_aggregation',
+    },
+    tz: {
+      type: 'string',
+      description: 'Timezone',
+    },
+  },
+  required: ['action'],
+};
+
 /**
  * Map user-friendly units to OpenWeather units.
  * Defaults to Celsius if not specified.
@@ -66,17 +110,11 @@ class OpenWeather extends Tool {
     'Units: "Celsius", "Kelvin", or "Fahrenheit" (default: Celsius). ' +
     'For timestamp action, use "date" in YYYY-MM-DD format.';
 
-  schema = z.object({
-    action: z.enum(['help', 'current_forecast', 'timestamp', 'daily_aggregation', 'overview']),
-    city: z.string().optional(),
-    lat: z.number().optional(),
-    lon: z.number().optional(),
-    exclude: z.string().optional(),
-    units: z.enum(['Celsius', 'Kelvin', 'Fahrenheit']).optional(),
-    lang: z.string().optional(),
-    date: z.string().optional(), // For timestamp and daily_aggregation
-    tz: z.string().optional(),
-  });
+  schema = openWeatherJsonSchema;
+
+  static get jsonSchema() {
+    return openWeatherJsonSchema;
+  }
 
   constructor(fields = {}) {
     super();
diff --git a/api/app/clients/tools/structured/StableDiffusion.js b/api/app/clients/tools/structured/StableDiffusion.js
index 3a1ea831d3..d7a7a4d96b 100644
--- a/api/app/clients/tools/structured/StableDiffusion.js
+++ b/api/app/clients/tools/structured/StableDiffusion.js
@@ -1,6 +1,5 @@
 // Generates image using stable diffusion webui's api (automatic1111)
 const fs = require('fs');
-const { z } = require('zod');
 const path = require('path');
 const axios = require('axios');
 const sharp = require('sharp');
@@ -11,6 +10,23 @@ const { FileContext, ContentTypes } = require('librechat-data-provider');
 const { getBasePath } = require('@librechat/api');
 const paths = require('~/config/paths');
 
+const stableDiffusionJsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      description:
+        'Detailed keywords to describe the subject, using at least 7 keywords to accurately describe the image, separated by comma',
+    },
+    negative_prompt: {
+      type: 'string',
+      description:
+        'Keywords we want to exclude from the final image, using at least 7 keywords to accurately describe the image, separated by comma',
+    },
+  },
+  required: ['prompt', 'negative_prompt'],
+};
+
 const displayMessage =
   "Stable Diffusion displayed an image. All generated images are already plainly visible, so don't repeat the descriptions in detail. Do not list download links as they are available in the UI already. The user may download the images by clicking on them, but do not mention anything about downloading to the user.";
 
@@ -46,18 +62,11 @@ class StableDiffusionAPI extends Tool {
 // - Generate images only once per human query unless explicitly requested by the user`;
     this.description =
       "You can generate images using text with 'stable-diffusion'. This tool is exclusively for visual content.";
-    this.schema = z.object({
-      prompt: z
-        .string()
-        .describe(
-          'Detailed keywords to describe the subject, using at least 7 keywords to accurately describe the image, separated by comma',
-        ),
-      negative_prompt: z
-        .string()
-        .describe(
-          'Keywords we want to exclude from the final image, using at least 7 keywords to accurately describe the image, separated by comma',
-        ),
-    });
+    this.schema = stableDiffusionJsonSchema;
+  }
+
+  static get jsonSchema() {
+    return stableDiffusionJsonSchema;
   }
 
   replaceNewLinesWithSpaces(inputString) {
diff --git a/api/app/clients/tools/structured/TavilySearchResults.js b/api/app/clients/tools/structured/TavilySearchResults.js
index 796f31dcca..0faddfb666 100644
--- a/api/app/clients/tools/structured/TavilySearchResults.js
+++ b/api/app/clients/tools/structured/TavilySearchResults.js
@@ -1,8 +1,75 @@
-const { z } = require('zod');
 const { ProxyAgent, fetch } = require('undici');
 const { Tool } = require('@langchain/core/tools');
 const { getEnvironmentVariable } = require('@langchain/core/utils/env');
 
+const tavilySearchJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      minLength: 1,
+      description: 'The search query string.',
+    },
+    max_results: {
+      type: 'number',
+      minimum: 1,
+      maximum: 10,
+      description: 'The maximum number of search results to return. Defaults to 5.',
+    },
+    search_depth: {
+      type: 'string',
+      enum: ['basic', 'advanced'],
+      description:
+        'The depth of the search, affecting result quality and response time (`basic` or `advanced`). Default is basic for quick results and advanced for indepth high quality results but longer response time. Advanced calls equals 2 requests.',
+    },
+    include_images: {
+      type: 'boolean',
+      description:
+        'Whether to include a list of query-related images in the response. Default is False.',
+    },
+    include_answer: {
+      type: 'boolean',
+      description: 'Whether to include answers in the search results. Default is False.',
+    },
+    include_raw_content: {
+      type: 'boolean',
+      description: 'Whether to include raw content in the search results. Default is False.',
+    },
+    include_domains: {
+      type: 'array',
+      items: { type: 'string' },
+      description: 'A list of domains to specifically include in the search results.',
+    },
+    exclude_domains: {
+      type: 'array',
+      items: { type: 'string' },
+      description: 'A list of domains to specifically exclude from the search results.',
+    },
+    topic: {
+      type: 'string',
+      enum: ['general', 'news', 'finance'],
+      description:
+        'The category of the search. Use news ONLY if query SPECIFCALLY mentions the word "news".',
+    },
+    time_range: {
+      type: 'string',
+      enum: ['day', 'week', 'month', 'year', 'd', 'w', 'm', 'y'],
+      description: 'The time range back from the current date to filter results.',
+    },
+    days: {
+      type: 'number',
+      minimum: 1,
+      description: 'Number of days back from the current date to include. Only if topic is news.',
+    },
+    include_image_descriptions: {
+      type: 'boolean',
+      description:
+        'When include_images is true, also add a descriptive text for each image. Default is false.',
+    },
+  },
+  required: ['query'],
+};
+
 class TavilySearchResults extends Tool {
   static lc_name() {
     return 'TavilySearchResults';
@@ -20,64 +87,11 @@ class TavilySearchResults extends Tool {
     this.description =
       'A search engine optimized for comprehensive, accurate, and trusted results. Useful for when you need to answer questions about current events.';
 
-    this.schema = z.object({
-      query: z.string().min(1).describe('The search query string.'),
-      max_results: z
-        .number()
-        .min(1)
-        .max(10)
-        .optional()
-        .describe('The maximum number of search results to return. Defaults to 5.'),
-      search_depth: z
-        .enum(['basic', 'advanced'])
-        .optional()
-        .describe(
-          'The depth of the search, affecting result quality and response time (`basic` or `advanced`). Default is basic for quick results and advanced for indepth high quality results but longer response time. Advanced calls equals 2 requests.',
-        ),
-      include_images: z
-        .boolean()
-        .optional()
-        .describe(
-          'Whether to include a list of query-related images in the response. Default is False.',
-        ),
-      include_answer: z
-        .boolean()
-        .optional()
-        .describe('Whether to include answers in the search results. Default is False.'),
-      include_raw_content: z
-        .boolean()
-        .optional()
-        .describe('Whether to include raw content in the search results. Default is False.'),
-      include_domains: z
-        .array(z.string())
-        .optional()
-        .describe('A list of domains to specifically include in the search results.'),
-      exclude_domains: z
-        .array(z.string())
-        .optional()
-        .describe('A list of domains to specifically exclude from the search results.'),
-      topic: z
-        .enum(['general', 'news', 'finance'])
-        .optional()
-        .describe(
-          'The category of the search. Use news ONLY if query SPECIFCALLY mentions the word "news".',
-        ),
-      time_range: z
-        .enum(['day', 'week', 'month', 'year', 'd', 'w', 'm', 'y'])
-        .optional()
-        .describe('The time range back from the current date to filter results.'),
-      days: z
-        .number()
-        .min(1)
-        .optional()
-        .describe('Number of days back from the current date to include. Only if topic is news.'),
-      include_image_descriptions: z
-        .boolean()
-        .optional()
-        .describe(
-          'When include_images is true, also add a descriptive text for each image. Default is false.',
-        ),
-    });
+    this.schema = tavilySearchJsonSchema;
+  }
+
+  static get jsonSchema() {
+    return tavilySearchJsonSchema;
   }
 
   getApiKey() {
@@ -89,12 +103,7 @@ class TavilySearchResults extends Tool {
   }
 
   async _call(input) {
-    const validationResult = this.schema.safeParse(input);
-    if (!validationResult.success) {
-      throw new Error(`Validation failed: ${JSON.stringify(validationResult.error.issues)}`);
-    }
-
-    const { query, ...rest } = validationResult.data;
+    const { query, ...rest } = input;
 
     const requestBody = {
       api_key: this.apiKey,
diff --git a/api/app/clients/tools/structured/TraversaalSearch.js b/api/app/clients/tools/structured/TraversaalSearch.js
index d2ccc35c75..9bc5e399f0 100644
--- a/api/app/clients/tools/structured/TraversaalSearch.js
+++ b/api/app/clients/tools/structured/TraversaalSearch.js
@@ -1,8 +1,19 @@
-const { z } = require('zod');
 const { Tool } = require('@langchain/core/tools');
 const { logger } = require('@librechat/data-schemas');
 const { getEnvironmentVariable } = require('@langchain/core/utils/env');
 
+const traversaalSearchJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      description:
+        "A properly written sentence to be interpreted by an AI to search the web according to the user's request.",
+    },
+  },
+  required: ['query'],
+};
+
 /**
  * Tool for the Traversaal AI search API, Ares.
  */
@@ -17,17 +28,15 @@ class TraversaalSearch extends Tool {
     Useful for when you need to answer questions about current events. Input should be a search query.`;
     this.description_for_model =
       '\'Please create a specific sentence for the AI to understand and use as a query to search the web based on the user\'s request. For example, "Find information about the highest mountains in the world." or "Show me the latest news articles about climate change and its impact on polar ice caps."\'';
-    this.schema = z.object({
-      query: z
-        .string()
-        .describe(
-          "A properly written sentence to be interpreted by an AI to search the web according to the user's request.",
-        ),
-    });
+    this.schema = traversaalSearchJsonSchema;
 
     this.apiKey = fields?.TRAVERSAAL_API_KEY ?? this.getApiKey();
   }
 
+  static get jsonSchema() {
+    return traversaalSearchJsonSchema;
+  }
+
   getApiKey() {
     const apiKey = getEnvironmentVariable('TRAVERSAAL_API_KEY');
     if (!apiKey && this.override) {
diff --git a/api/app/clients/tools/structured/Wolfram.js b/api/app/clients/tools/structured/Wolfram.js
index 1f7fe6b1b7..196626e39c 100644
--- a/api/app/clients/tools/structured/Wolfram.js
+++ b/api/app/clients/tools/structured/Wolfram.js
@@ -1,9 +1,19 @@
 /* eslint-disable no-useless-escape */
-const { z } = require('zod');
 const axios = require('axios');
 const { Tool } = require('@langchain/core/tools');
 const { logger } = require('@librechat/data-schemas');
 
+const wolframJsonSchema = {
+  type: 'object',
+  properties: {
+    input: {
+      type: 'string',
+      description: 'Natural language query to WolframAlpha following the guidelines',
+    },
+  },
+  required: ['input'],
+};
+
 class WolframAlphaAPI extends Tool {
   constructor(fields) {
     super();
@@ -41,9 +51,11 @@ class WolframAlphaAPI extends Tool {
     // -- Do not explain each step unless user input is needed. Proceed directly to making a better API call based on the available assumptions.`;
     this.description = `WolframAlpha offers computation, math, curated knowledge, and real-time data. It handles natural language queries and performs complex calculations.
     Follow the guidelines to get the best results.`;
-    this.schema = z.object({
-      input: z.string().describe('Natural language query to WolframAlpha following the guidelines'),
-    });
+    this.schema = wolframJsonSchema;
+  }
+
+  static get jsonSchema() {
+    return wolframJsonSchema;
   }
 
   async fetchRawText(url) {
diff --git a/api/app/clients/tools/util/fileSearch.js b/api/app/clients/tools/util/fileSearch.js
index d48b9b986d..2654722be4 100644
--- a/api/app/clients/tools/util/fileSearch.js
+++ b/api/app/clients/tools/util/fileSearch.js
@@ -1,4 +1,3 @@
-const { z } = require('zod');
 const axios = require('axios');
 const { tool } = require('@langchain/core/tools');
 const { logger } = require('@librechat/data-schemas');
@@ -7,6 +6,18 @@ const { Tools, EToolResources } = require('librechat-data-provider');
 const { filterFilesByAgentAccess } = require('~/server/services/Files/permissions');
 const { getFiles } = require('~/models');
 
+const fileSearchJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      description:
+        "A natural language query to search for relevant information in the files. Be specific and use keywords related to the information you're looking for. The query will be used for semantic similarity matching against the file contents.",
+    },
+  },
+  required: ['query'],
+};
+
 /**
  *
  * @param {Object} options
@@ -182,15 +193,9 @@ Use the EXACT anchor markers shown below (copy them verbatim) immediately after
 **ALWAYS mention the filename in your text before the citation marker. NEVER use markdown links or footnotes.**`
           : ''
       }`,
-      schema: z.object({
-        query: z
-          .string()
-          .describe(
-            "A natural language query to search for relevant information in the files. Be specific and use keywords related to the information you're looking for. The query will be used for semantic similarity matching against the file contents.",
-          ),
-      }),
+      schema: fileSearchJsonSchema,
     },
   );
 };
 
-module.exports = { createFileSearchTool, primeFiles };
+module.exports = { createFileSearchTool, primeFiles, fileSearchJsonSchema };
diff --git a/api/app/clients/tools/util/handleTools.js b/api/app/clients/tools/util/handleTools.js
index da4c687b4d..65c88ce83f 100644
--- a/api/app/clients/tools/util/handleTools.js
+++ b/api/app/clients/tools/util/handleTools.js
@@ -11,6 +11,7 @@ const {
   mcpToolPattern,
   loadWebSearchAuth,
   buildImageToolContext,
+  buildWebSearchContext,
 } = require('@librechat/api');
 const { getMCPServersRegistry } = require('~/config');
 const {
@@ -19,7 +20,6 @@ const {
   Permissions,
   EToolResources,
   PermissionTypes,
-  replaceSpecialVars,
 } = require('librechat-data-provider');
 const {
   availableTools,
@@ -325,24 +325,7 @@ const loadTools = async ({
       });
       const { onSearchResults, onGetHighlights } = options?.[Tools.web_search] ?? {};
       requestedTools[tool] = async () => {
-        toolContextMap[tool] = `# \`${tool}\`:
-Current Date & Time: ${replaceSpecialVars({ text: '{{iso_datetime}}' })}
-
-**Execute immediately without preface.** After search, provide a brief summary addressing the query directly, then structure your response with clear Markdown formatting (## headers, lists, tables). Cite sources properly, tailor tone to query type, and provide comprehensive details.
-
-**CITATION FORMAT - UNICODE ESCAPE SEQUENCES ONLY:**
-Use these EXACT escape sequences (copy verbatim): \\ue202 (before each anchor), \\ue200 (group start), \\ue201 (group end), \\ue203 (highlight start), \\ue204 (highlight end)
-
-Anchor pattern: \\ue202turn{N}{type}{index} where N=turn number, type=search|news|image|ref, index=0,1,2...
-
-**Examples (copy these exactly):**
-- Single: "Statement.\\ue202turn0search0"
-- Multiple: "Statement.\\ue202turn0search0\\ue202turn0news1"
-- Group: "Statement. \\ue200\\ue202turn0search0\\ue202turn0news1\\ue201"
-- Highlight: "\\ue203Cited text.\\ue204\\ue202turn0search0"
-- Image: "See photo\\ue202turn0image0."
-
-**CRITICAL:** Output escape sequences EXACTLY as shown. Do NOT substitute with † or other symbols. Place anchors AFTER punctuation. Cite every non-obvious fact/quote. NEVER use markdown links, [1], footnotes, or HTML tags.`.trim();
+        toolContextMap[tool] = buildWebSearchContext();
         return createSearchTool({
           ...result.authResult,
           onSearchResults,
diff --git a/api/cache/banViolation.js b/api/cache/banViolation.js
index 122355edb1..4d321889c1 100644
--- a/api/cache/banViolation.js
+++ b/api/cache/banViolation.js
@@ -55,6 +55,7 @@ const banViolation = async (req, res, errorMessage) => {
 
   res.clearCookie('refreshToken');
   res.clearCookie('openid_access_token');
+  res.clearCookie('openid_id_token');
   res.clearCookie('openid_user_id');
   res.clearCookie('token_provider');
 
diff --git a/api/cache/getLogStores.js b/api/cache/getLogStores.js
index 40aac08ee6..3089192196 100644
--- a/api/cache/getLogStores.js
+++ b/api/cache/getLogStores.js
@@ -37,6 +37,7 @@ const namespaces = {
   [CacheKeys.ROLES]: standardCache(CacheKeys.ROLES),
   [CacheKeys.APP_CONFIG]: standardCache(CacheKeys.APP_CONFIG),
   [CacheKeys.CONFIG_STORE]: standardCache(CacheKeys.CONFIG_STORE),
+  [CacheKeys.TOOL_CACHE]: standardCache(CacheKeys.TOOL_CACHE),
   [CacheKeys.PENDING_REQ]: standardCache(CacheKeys.PENDING_REQ),
   [CacheKeys.ENCODED_DOMAINS]: new Keyv({ store: keyvMongo, namespace: CacheKeys.ENCODED_DOMAINS }),
   [CacheKeys.ABORT_KEYS]: standardCache(CacheKeys.ABORT_KEYS, Time.TEN_MINUTES),
@@ -51,6 +52,10 @@ const namespaces = {
     CacheKeys.OPENID_EXCHANGED_TOKENS,
     Time.TEN_MINUTES,
   ),
+  [CacheKeys.ADMIN_OAUTH_EXCHANGE]: standardCache(
+    CacheKeys.ADMIN_OAUTH_EXCHANGE,
+    Time.THIRTY_SECONDS,
+  ),
 };
 
 /**
diff --git a/api/db/connect.js b/api/db/connect.js
index 26166ccff8..3534884b57 100644
--- a/api/db/connect.js
+++ b/api/db/connect.js
@@ -40,6 +40,10 @@ if (!cached) {
   cached = global.mongoose = { conn: null, promise: null };
 }
 
+mongoose.connection.on('error', (err) => {
+  logger.error('[connectDb] MongoDB connection error:', err);
+});
+
 async function connectDb() {
   if (cached.conn && cached.conn?._readyState === 1) {
     return cached.conn;
diff --git a/api/db/indexSync.js b/api/db/indexSync.js
index b39f018b3a..8e8e999d92 100644
--- a/api/db/indexSync.js
+++ b/api/db/indexSync.js
@@ -13,6 +13,11 @@ const searchEnabled = isEnabled(process.env.SEARCH);
 const indexingDisabled = isEnabled(process.env.MEILI_NO_SYNC);
 let currentTimeout = null;
 
+const defaultSyncThreshold = 1000;
+const syncThreshold = process.env.MEILI_SYNC_THRESHOLD
+  ? parseInt(process.env.MEILI_SYNC_THRESHOLD, 10)
+  : defaultSyncThreshold;
+
 class MeiliSearchClient {
   static instance = null;
 
@@ -221,25 +226,25 @@ async function performSync(flowManager, flowId, flowType) {
     }
 
     // Check if we need to sync messages
+    logger.info('[indexSync] Requesting message sync progress...');
     const messageProgress = await Message.getSyncProgress();
     if (!messageProgress.isComplete || settingsUpdated) {
       logger.info(
         `[indexSync] Messages need syncing: ${messageProgress.totalProcessed}/${messageProgress.totalDocuments} indexed`,
       );
 
-      // Check if we should do a full sync or incremental
-      const messageCount = await Message.countDocuments();
+      const messageCount = messageProgress.totalDocuments;
       const messagesIndexed = messageProgress.totalProcessed;
-      const syncThreshold = parseInt(process.env.MEILI_SYNC_THRESHOLD || '1000', 10);
+      const unindexedMessages = messageCount - messagesIndexed;
 
-      if (messageCount - messagesIndexed > syncThreshold) {
-        logger.info('[indexSync] Starting full message sync due to large difference');
-        await Message.syncWithMeili();
-        messagesSync = true;
-      } else if (messageCount !== messagesIndexed) {
-        logger.warn('[indexSync] Messages out of sync, performing incremental sync');
+      if (settingsUpdated || unindexedMessages > syncThreshold) {
+        logger.info(`[indexSync] Starting message sync (${unindexedMessages} unindexed)`);
         await Message.syncWithMeili();
         messagesSync = true;
+      } else if (unindexedMessages > 0) {
+        logger.info(
+          `[indexSync] ${unindexedMessages} messages unindexed (below threshold: ${syncThreshold}, skipping)`,
+        );
       }
     } else {
       logger.info(
@@ -254,18 +259,18 @@ async function performSync(flowManager, flowId, flowType) {
         `[indexSync] Conversations need syncing: ${convoProgress.totalProcessed}/${convoProgress.totalDocuments} indexed`,
       );
 
-      const convoCount = await Conversation.countDocuments();
+      const convoCount = convoProgress.totalDocuments;
       const convosIndexed = convoProgress.totalProcessed;
-      const syncThreshold = parseInt(process.env.MEILI_SYNC_THRESHOLD || '1000', 10);
 
-      if (convoCount - convosIndexed > syncThreshold) {
-        logger.info('[indexSync] Starting full conversation sync due to large difference');
-        await Conversation.syncWithMeili();
-        convosSync = true;
-      } else if (convoCount !== convosIndexed) {
-        logger.warn('[indexSync] Convos out of sync, performing incremental sync');
+      const unindexedConvos = convoCount - convosIndexed;
+      if (settingsUpdated || unindexedConvos > syncThreshold) {
+        logger.info(`[indexSync] Starting convos sync (${unindexedConvos} unindexed)`);
         await Conversation.syncWithMeili();
         convosSync = true;
+      } else if (unindexedConvos > 0) {
+        logger.info(
+          `[indexSync] ${unindexedConvos} convos unindexed (below threshold: ${syncThreshold}, skipping)`,
+        );
       }
     } else {
       logger.info(
diff --git a/api/db/indexSync.spec.js b/api/db/indexSync.spec.js
new file mode 100644
index 0000000000..c2e5901d6a
--- /dev/null
+++ b/api/db/indexSync.spec.js
@@ -0,0 +1,465 @@
+/**
+ * Unit tests for performSync() function in indexSync.js
+ *
+ * Tests use real mongoose with mocked model methods, only mocking external calls.
+ */
+
+const mongoose = require('mongoose');
+
+// Mock only external dependencies (not internal classes/models)
+const mockLogger = {
+  info: jest.fn(),
+  warn: jest.fn(),
+  error: jest.fn(),
+  debug: jest.fn(),
+};
+
+const mockMeiliHealth = jest.fn();
+const mockMeiliIndex = jest.fn();
+const mockBatchResetMeiliFlags = jest.fn();
+const mockIsEnabled = jest.fn();
+const mockGetLogStores = jest.fn();
+
+// Create mock models that will be reused
+const createMockModel = (collectionName) => ({
+  collection: { name: collectionName },
+  getSyncProgress: jest.fn(),
+  syncWithMeili: jest.fn(),
+  countDocuments: jest.fn(),
+});
+
+const originalMessageModel = mongoose.models.Message;
+const originalConversationModel = mongoose.models.Conversation;
+
+// Mock external modules
+jest.mock('@librechat/data-schemas', () => ({
+  logger: mockLogger,
+}));
+
+jest.mock('meilisearch', () => ({
+  MeiliSearch: jest.fn(() => ({
+    health: mockMeiliHealth,
+    index: mockMeiliIndex,
+  })),
+}));
+
+jest.mock('./utils', () => ({
+  batchResetMeiliFlags: mockBatchResetMeiliFlags,
+}));
+
+jest.mock('@librechat/api', () => ({
+  isEnabled: mockIsEnabled,
+  FlowStateManager: jest.fn(),
+}));
+
+jest.mock('~/cache', () => ({
+  getLogStores: mockGetLogStores,
+}));
+
+// Set environment before module load
+process.env.MEILI_HOST = 'http://localhost:7700';
+process.env.MEILI_MASTER_KEY = 'test-key';
+process.env.SEARCH = 'true';
+process.env.MEILI_SYNC_THRESHOLD = '1000'; // Set threshold before module loads
+
+describe('performSync() - syncThreshold logic', () => {
+  const ORIGINAL_ENV = process.env;
+  let Message;
+  let Conversation;
+
+  beforeAll(() => {
+    Message = createMockModel('messages');
+    Conversation = createMockModel('conversations');
+
+    mongoose.models.Message = Message;
+    mongoose.models.Conversation = Conversation;
+  });
+
+  beforeEach(() => {
+    // Reset all mocks
+    jest.clearAllMocks();
+    // Reset modules to ensure fresh load of indexSync.js and its top-level consts (like syncThreshold)
+    jest.resetModules();
+
+    // Set up environment
+    process.env = { ...ORIGINAL_ENV };
+    process.env.MEILI_HOST = 'http://localhost:7700';
+    process.env.MEILI_MASTER_KEY = 'test-key';
+    process.env.SEARCH = 'true';
+    delete process.env.MEILI_NO_SYNC;
+
+    // Re-ensure models are available in mongoose after resetModules
+    // We must require mongoose again to get the fresh instance that indexSync will use
+    const mongoose = require('mongoose');
+    mongoose.models.Message = Message;
+    mongoose.models.Conversation = Conversation;
+
+    // Mock isEnabled
+    mockIsEnabled.mockImplementation((val) => val === 'true' || val === true);
+
+    // Mock MeiliSearch client responses
+    mockMeiliHealth.mockResolvedValue({ status: 'available' });
+    mockMeiliIndex.mockReturnValue({
+      getSettings: jest.fn().mockResolvedValue({ filterableAttributes: ['user'] }),
+      updateSettings: jest.fn().mockResolvedValue({}),
+      search: jest.fn().mockResolvedValue({ hits: [] }),
+    });
+
+    mockBatchResetMeiliFlags.mockResolvedValue(undefined);
+  });
+
+  afterEach(() => {
+    process.env = ORIGINAL_ENV;
+  });
+
+  afterAll(() => {
+    mongoose.models.Message = originalMessageModel;
+    mongoose.models.Conversation = originalConversationModel;
+  });
+
+  test('triggers sync when unindexed messages exceed syncThreshold', async () => {
+    // Arrange: Set threshold before module load
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Arrange: 1050 unindexed messages > 1000 threshold
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 1150, // 1050 unindexed
+      isComplete: false,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 50,
+      totalDocuments: 50,
+      isComplete: true,
+    });
+
+    Message.syncWithMeili.mockResolvedValue(undefined);
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: No countDocuments calls
+    expect(Message.countDocuments).not.toHaveBeenCalled();
+    expect(Conversation.countDocuments).not.toHaveBeenCalled();
+
+    // Assert: Message sync triggered because 1050 > 1000
+    expect(Message.syncWithMeili).toHaveBeenCalledTimes(1);
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Messages need syncing: 100/1150 indexed',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Starting message sync (1050 unindexed)',
+    );
+
+    // Assert: Conversation sync NOT triggered (already complete)
+    expect(Conversation.syncWithMeili).not.toHaveBeenCalled();
+  });
+
+  test('skips sync when unindexed messages are below syncThreshold', async () => {
+    // Arrange: 50 unindexed messages < 1000 threshold
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 150, // 50 unindexed
+      isComplete: false,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 50,
+      totalDocuments: 50,
+      isComplete: true,
+    });
+
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: No countDocuments calls
+    expect(Message.countDocuments).not.toHaveBeenCalled();
+    expect(Conversation.countDocuments).not.toHaveBeenCalled();
+
+    // Assert: Message sync NOT triggered because 50 < 1000
+    expect(Message.syncWithMeili).not.toHaveBeenCalled();
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Messages need syncing: 100/150 indexed',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] 50 messages unindexed (below threshold: 1000, skipping)',
+    );
+
+    // Assert: Conversation sync NOT triggered (already complete)
+    expect(Conversation.syncWithMeili).not.toHaveBeenCalled();
+  });
+
+  test('respects syncThreshold at boundary (exactly at threshold)', async () => {
+    // Arrange: 1000 unindexed messages = 1000 threshold (NOT greater than)
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 1100, // 1000 unindexed
+      isComplete: false,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 0,
+      totalDocuments: 0,
+      isComplete: true,
+    });
+
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: No countDocuments calls
+    expect(Message.countDocuments).not.toHaveBeenCalled();
+
+    // Assert: Message sync NOT triggered because 1000 is NOT > 1000
+    expect(Message.syncWithMeili).not.toHaveBeenCalled();
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Messages need syncing: 100/1100 indexed',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] 1000 messages unindexed (below threshold: 1000, skipping)',
+    );
+  });
+
+  test('triggers sync when unindexed is threshold + 1', async () => {
+    // Arrange: 1001 unindexed messages > 1000 threshold
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 1101, // 1001 unindexed
+      isComplete: false,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 0,
+      totalDocuments: 0,
+      isComplete: true,
+    });
+
+    Message.syncWithMeili.mockResolvedValue(undefined);
+
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: No countDocuments calls
+    expect(Message.countDocuments).not.toHaveBeenCalled();
+
+    // Assert: Message sync triggered because 1001 > 1000
+    expect(Message.syncWithMeili).toHaveBeenCalledTimes(1);
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Messages need syncing: 100/1101 indexed',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Starting message sync (1001 unindexed)',
+    );
+  });
+
+  test('uses totalDocuments from convoProgress for conversation sync decisions', async () => {
+    // Arrange: Messages complete, conversations need sync
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 100,
+      isComplete: true,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 50,
+      totalDocuments: 1100, // 1050 unindexed > 1000 threshold
+      isComplete: false,
+    });
+
+    Conversation.syncWithMeili.mockResolvedValue(undefined);
+
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: No countDocuments calls (the optimization)
+    expect(Message.countDocuments).not.toHaveBeenCalled();
+    expect(Conversation.countDocuments).not.toHaveBeenCalled();
+
+    // Assert: Only conversation sync triggered
+    expect(Message.syncWithMeili).not.toHaveBeenCalled();
+    expect(Conversation.syncWithMeili).toHaveBeenCalledTimes(1);
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Conversations need syncing: 50/1100 indexed',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Starting convos sync (1050 unindexed)',
+    );
+  });
+
+  test('skips sync when collections are fully synced', async () => {
+    // Arrange: Everything already synced
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 100,
+      isComplete: true,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 50,
+      totalDocuments: 50,
+      isComplete: true,
+    });
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: No countDocuments calls
+    expect(Message.countDocuments).not.toHaveBeenCalled();
+    expect(Conversation.countDocuments).not.toHaveBeenCalled();
+
+    // Assert: No sync triggered
+    expect(Message.syncWithMeili).not.toHaveBeenCalled();
+    expect(Conversation.syncWithMeili).not.toHaveBeenCalled();
+
+    // Assert: Correct logs
+    expect(mockLogger.info).toHaveBeenCalledWith('[indexSync] Messages are fully synced: 100/100');
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Conversations are fully synced: 50/50',
+    );
+  });
+
+  test('triggers message sync when settingsUpdated even if below syncThreshold', async () => {
+    // Arrange: Only 50 unindexed messages (< 1000 threshold), but settings were updated
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 150, // 50 unindexed
+      isComplete: false,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 50,
+      totalDocuments: 50,
+      isComplete: true,
+    });
+
+    Message.syncWithMeili.mockResolvedValue(undefined);
+
+    // Mock settings update scenario
+    mockMeiliIndex.mockReturnValue({
+      getSettings: jest.fn().mockResolvedValue({ filterableAttributes: [] }), // No user field
+      updateSettings: jest.fn().mockResolvedValue({}),
+      search: jest.fn().mockResolvedValue({ hits: [] }),
+    });
+
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: Flags were reset due to settings update
+    expect(mockBatchResetMeiliFlags).toHaveBeenCalledWith(Message.collection);
+    expect(mockBatchResetMeiliFlags).toHaveBeenCalledWith(Conversation.collection);
+
+    // Assert: Message sync triggered despite being below threshold (50 < 1000)
+    expect(Message.syncWithMeili).toHaveBeenCalledTimes(1);
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Settings updated. Forcing full re-sync to reindex with new configuration...',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Starting message sync (50 unindexed)',
+    );
+  });
+
+  test('triggers conversation sync when settingsUpdated even if below syncThreshold', async () => {
+    // Arrange: Messages complete, conversations have 50 unindexed (< 1000 threshold), but settings were updated
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 100,
+      isComplete: true,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 50,
+      totalDocuments: 100, // 50 unindexed
+      isComplete: false,
+    });
+
+    Conversation.syncWithMeili.mockResolvedValue(undefined);
+
+    // Mock settings update scenario
+    mockMeiliIndex.mockReturnValue({
+      getSettings: jest.fn().mockResolvedValue({ filterableAttributes: [] }), // No user field
+      updateSettings: jest.fn().mockResolvedValue({}),
+      search: jest.fn().mockResolvedValue({ hits: [] }),
+    });
+
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: Flags were reset due to settings update
+    expect(mockBatchResetMeiliFlags).toHaveBeenCalledWith(Message.collection);
+    expect(mockBatchResetMeiliFlags).toHaveBeenCalledWith(Conversation.collection);
+
+    // Assert: Conversation sync triggered despite being below threshold (50 < 1000)
+    expect(Conversation.syncWithMeili).toHaveBeenCalledTimes(1);
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Settings updated. Forcing full re-sync to reindex with new configuration...',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith('[indexSync] Starting convos sync (50 unindexed)');
+  });
+
+  test('triggers both message and conversation sync when settingsUpdated even if both below syncThreshold', async () => {
+    // Arrange: Set threshold before module load
+    process.env.MEILI_SYNC_THRESHOLD = '1000';
+
+    // Arrange: Both have documents below threshold (50 each), but settings were updated
+    Message.getSyncProgress.mockResolvedValue({
+      totalProcessed: 100,
+      totalDocuments: 150, // 50 unindexed
+      isComplete: false,
+    });
+
+    Conversation.getSyncProgress.mockResolvedValue({
+      totalProcessed: 50,
+      totalDocuments: 100, // 50 unindexed
+      isComplete: false,
+    });
+
+    Message.syncWithMeili.mockResolvedValue(undefined);
+    Conversation.syncWithMeili.mockResolvedValue(undefined);
+
+    // Mock settings update scenario
+    mockMeiliIndex.mockReturnValue({
+      getSettings: jest.fn().mockResolvedValue({ filterableAttributes: [] }), // No user field
+      updateSettings: jest.fn().mockResolvedValue({}),
+      search: jest.fn().mockResolvedValue({ hits: [] }),
+    });
+
+    // Act
+    const indexSync = require('./indexSync');
+    await indexSync();
+
+    // Assert: Flags were reset due to settings update
+    expect(mockBatchResetMeiliFlags).toHaveBeenCalledWith(Message.collection);
+    expect(mockBatchResetMeiliFlags).toHaveBeenCalledWith(Conversation.collection);
+
+    // Assert: Both syncs triggered despite both being below threshold
+    expect(Message.syncWithMeili).toHaveBeenCalledTimes(1);
+    expect(Conversation.syncWithMeili).toHaveBeenCalledTimes(1);
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Settings updated. Forcing full re-sync to reindex with new configuration...',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith(
+      '[indexSync] Starting message sync (50 unindexed)',
+    );
+    expect(mockLogger.info).toHaveBeenCalledWith('[indexSync] Starting convos sync (50 unindexed)');
+  });
+});
diff --git a/api/db/utils.js b/api/db/utils.js
index 4a311d9832..32051be78d 100644
--- a/api/db/utils.js
+++ b/api/db/utils.js
@@ -26,7 +26,7 @@ async function batchResetMeiliFlags(collection) {
   try {
     while (hasMore) {
       const docs = await collection
-        .find({ expiredAt: null, _meiliIndex: true }, { projection: { _id: 1 } })
+        .find({ expiredAt: null, _meiliIndex: { $ne: false } }, { projection: { _id: 1 } })
         .limit(BATCH_SIZE)
         .toArray();
 
diff --git a/api/db/utils.spec.js b/api/db/utils.spec.js
index 8b32b4aea8..adf4f6cd86 100644
--- a/api/db/utils.spec.js
+++ b/api/db/utils.spec.js
@@ -265,8 +265,8 @@ describe('batchResetMeiliFlags', () => {
 
       const result = await batchResetMeiliFlags(testCollection);
 
-      // Only one document has _meiliIndex: true
-      expect(result).toBe(1);
+      // both documents should be updated
+      expect(result).toBe(2);
     });
 
     it('should handle mixed document states correctly', async () => {
@@ -275,16 +275,18 @@ describe('batchResetMeiliFlags', () => {
         { _id: new mongoose.Types.ObjectId(), expiredAt: null, _meiliIndex: false },
         { _id: new mongoose.Types.ObjectId(), expiredAt: new Date(), _meiliIndex: true },
         { _id: new mongoose.Types.ObjectId(), expiredAt: null, _meiliIndex: true },
+        { _id: new mongoose.Types.ObjectId(), expiredAt: null, _meiliIndex: null },
+        { _id: new mongoose.Types.ObjectId(), expiredAt: null },
       ]);
 
       const result = await batchResetMeiliFlags(testCollection);
 
-      expect(result).toBe(2);
+      expect(result).toBe(4);
 
       const flaggedDocs = await testCollection
         .find({ expiredAt: null, _meiliIndex: false })
         .toArray();
-      expect(flaggedDocs).toHaveLength(3); // 2 were updated, 1 was already false
+      expect(flaggedDocs).toHaveLength(5); // 4 were updated, 1 was already false
     });
   });
 
diff --git a/api/models/Agent.js b/api/models/Agent.js
index 3df2bcbec2..663285183a 100644
--- a/api/models/Agent.js
+++ b/api/models/Agent.js
@@ -11,17 +11,15 @@ const {
   isEphemeralAgentId,
   encodeEphemeralAgentId,
 } = require('librechat-data-provider');
-const { GLOBAL_PROJECT_NAME, mcp_all, mcp_delimiter } =
-  require('librechat-data-provider').Constants;
+const { mcp_all, mcp_delimiter } = require('librechat-data-provider').Constants;
 const {
   removeAgentFromAllProjects,
   removeAgentIdsFromProject,
   addAgentIdsToProject,
-  getProjectByName,
 } = require('./Project');
 const { removeAllPermissions } = require('~/server/services/PermissionService');
 const { getMCPServerTools } = require('~/server/services/Config');
-const { Agent, AclEntry } = require('~/db/models');
+const { Agent, AclEntry, User } = require('~/db/models');
 const { getActions } = require('./Action');
 
 /**
@@ -591,15 +589,29 @@ const deleteAgent = async (searchParameter) => {
   const agent = await Agent.findOneAndDelete(searchParameter);
   if (agent) {
     await removeAgentFromAllProjects(agent.id);
-    await removeAllPermissions({
-      resourceType: ResourceType.AGENT,
-      resourceId: agent._id,
-    });
+    await Promise.all([
+      removeAllPermissions({
+        resourceType: ResourceType.AGENT,
+        resourceId: agent._id,
+      }),
+      removeAllPermissions({
+        resourceType: ResourceType.REMOTE_AGENT,
+        resourceId: agent._id,
+      }),
+    ]);
     try {
       await Agent.updateMany({ 'edges.to': agent.id }, { $pull: { edges: { to: agent.id } } });
     } catch (error) {
       logger.error('[deleteAgent] Error removing agent from handoff edges', error);
     }
+    try {
+      await User.updateMany(
+        { 'favorites.agentId': agent.id },
+        { $pull: { favorites: { agentId: agent.id } } },
+      );
+    } catch (error) {
+      logger.error('[deleteAgent] Error removing agent from user favorites', error);
+    }
   }
   return agent;
 };
@@ -625,10 +637,19 @@ const deleteUserAgents = async (userId) => {
     }
 
     await AclEntry.deleteMany({
-      resourceType: ResourceType.AGENT,
+      resourceType: { $in: [ResourceType.AGENT, ResourceType.REMOTE_AGENT] },
       resourceId: { $in: agentObjectIds },
     });
 
+    try {
+      await User.updateMany(
+        { 'favorites.agentId': { $in: agentIds } },
+        { $pull: { favorites: { agentId: { $in: agentIds } } } },
+      );
+    } catch (error) {
+      logger.error('[deleteUserAgents] Error removing agents from user favorites', error);
+    }
+
     await Agent.deleteMany({ author: userId });
   } catch (error) {
     logger.error('[deleteUserAgents] General error:', error);
@@ -735,59 +756,6 @@ const getListAgentsByAccess = async ({
   };
 };
 
-/**
- * Get all agents.
- * @deprecated Use getListAgentsByAccess for ACL-aware agent listing
- * @param {Object} searchParameter - The search parameters to find matching agents.
- * @param {string} searchParameter.author - The user ID of the agent's author.
- * @returns {Promise<Object>} A promise that resolves to an object containing the agents data and pagination info.
- */
-const getListAgents = async (searchParameter) => {
-  const { author, ...otherParams } = searchParameter;
-
-  let query = Object.assign({ author }, otherParams);
-
-  const globalProject = await getProjectByName(GLOBAL_PROJECT_NAME, ['agentIds']);
-  if (globalProject && (globalProject.agentIds?.length ?? 0) > 0) {
-    const globalQuery = { id: { $in: globalProject.agentIds }, ...otherParams };
-    delete globalQuery.author;
-    query = { $or: [globalQuery, query] };
-  }
-  const agents = (
-    await Agent.find(query, {
-      id: 1,
-      _id: 1,
-      name: 1,
-      avatar: 1,
-      author: 1,
-      projectIds: 1,
-      description: 1,
-      // @deprecated - isCollaborative replaced by ACL permissions
-      isCollaborative: 1,
-      category: 1,
-    }).lean()
-  ).map((agent) => {
-    if (agent.author?.toString() !== author) {
-      delete agent.author;
-    }
-    if (agent.author) {
-      agent.author = agent.author.toString();
-    }
-    return agent;
-  });
-
-  const hasMore = agents.length > 0;
-  const firstId = agents.length > 0 ? agents[0].id : null;
-  const lastId = agents.length > 0 ? agents[agents.length - 1].id : null;
-
-  return {
-    data: agents,
-    has_more: hasMore,
-    first_id: firstId,
-    last_id: lastId,
-  };
-};
-
 /**
  * Updates the projects associated with an agent, adding and removing project IDs as specified.
  * This function also updates the corresponding projects to include or exclude the agent ID.
@@ -953,12 +921,11 @@ module.exports = {
   updateAgent,
   deleteAgent,
   deleteUserAgents,
-  getListAgents,
   revertAgentVersion,
   updateAgentProjects,
+  countPromotedAgents,
   addAgentResourceFile,
   getListAgentsByAccess,
   removeAgentResourceFiles,
   generateActionMetadataHash,
-  countPromotedAgents,
 };
diff --git a/api/models/Agent.spec.js b/api/models/Agent.spec.js
index 51256f8cf1..baceb3e8f3 100644
--- a/api/models/Agent.spec.js
+++ b/api/models/Agent.spec.js
@@ -22,17 +22,17 @@ const {
   createAgent,
   updateAgent,
   deleteAgent,
-  getListAgents,
-  getListAgentsByAccess,
+  deleteUserAgents,
   revertAgentVersion,
   updateAgentProjects,
   addAgentResourceFile,
+  getListAgentsByAccess,
   removeAgentResourceFiles,
   generateActionMetadataHash,
 } = require('./Agent');
 const permissionService = require('~/server/services/PermissionService');
 const { getCachedTools, getMCPServerTools } = require('~/server/services/Config');
-const { AclEntry } = require('~/db/models');
+const { AclEntry, User } = require('~/db/models');
 
 /**
  * @type {import('mongoose').Model<import('@librechat/data-schemas').IAgent>}
@@ -59,6 +59,7 @@ describe('models/Agent', () => {
 
     beforeEach(async () => {
       await Agent.deleteMany({});
+      await User.deleteMany({});
     });
 
     test('should add tool_resource to tools if missing', async () => {
@@ -575,43 +576,488 @@ describe('models/Agent', () => {
       expect(sourceAgentAfter.edges).toHaveLength(0);
     });
 
-    test('should list agents by author', async () => {
+    test('should remove agent from user favorites when agent is deleted', async () => {
+      const agentId = `agent_${uuidv4()}`;
+      const authorId = new mongoose.Types.ObjectId();
+      const userId = new mongoose.Types.ObjectId();
+
+      // Create agent
+      await createAgent({
+        id: agentId,
+        name: 'Agent To Delete',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      // Create user with the agent in favorites
+      await User.create({
+        _id: userId,
+        name: 'Test User',
+        email: `test-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: agentId }, { model: 'gpt-4', endpoint: 'openAI' }],
+      });
+
+      // Verify user has agent in favorites
+      const userBefore = await User.findById(userId);
+      expect(userBefore.favorites).toHaveLength(2);
+      expect(userBefore.favorites.some((f) => f.agentId === agentId)).toBe(true);
+
+      // Delete the agent
+      await deleteAgent({ id: agentId });
+
+      // Verify agent is deleted
+      const agentAfterDelete = await getAgent({ id: agentId });
+      expect(agentAfterDelete).toBeNull();
+
+      // Verify agent is removed from user favorites
+      const userAfter = await User.findById(userId);
+      expect(userAfter.favorites).toHaveLength(1);
+      expect(userAfter.favorites.some((f) => f.agentId === agentId)).toBe(false);
+      expect(userAfter.favorites.some((f) => f.model === 'gpt-4')).toBe(true);
+    });
+
+    test('should remove agent from multiple users favorites when agent is deleted', async () => {
+      const agentId = `agent_${uuidv4()}`;
+      const authorId = new mongoose.Types.ObjectId();
+      const user1Id = new mongoose.Types.ObjectId();
+      const user2Id = new mongoose.Types.ObjectId();
+
+      // Create agent
+      await createAgent({
+        id: agentId,
+        name: 'Agent To Delete',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      // Create two users with the agent in favorites
+      await User.create({
+        _id: user1Id,
+        name: 'Test User 1',
+        email: `test1-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: agentId }],
+      });
+
+      await User.create({
+        _id: user2Id,
+        name: 'Test User 2',
+        email: `test2-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: agentId }, { agentId: `agent_${uuidv4()}` }],
+      });
+
+      // Delete the agent
+      await deleteAgent({ id: agentId });
+
+      // Verify agent is removed from both users' favorites
+      const user1After = await User.findById(user1Id);
+      const user2After = await User.findById(user2Id);
+
+      expect(user1After.favorites).toHaveLength(0);
+      expect(user2After.favorites).toHaveLength(1);
+      expect(user2After.favorites.some((f) => f.agentId === agentId)).toBe(false);
+    });
+
+    test('should preserve other agents in database when one agent is deleted', async () => {
+      const agentToDeleteId = `agent_${uuidv4()}`;
+      const agentToKeep1Id = `agent_${uuidv4()}`;
+      const agentToKeep2Id = `agent_${uuidv4()}`;
+      const authorId = new mongoose.Types.ObjectId();
+
+      // Create multiple agents
+      await createAgent({
+        id: agentToDeleteId,
+        name: 'Agent To Delete',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      await createAgent({
+        id: agentToKeep1Id,
+        name: 'Agent To Keep 1',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      await createAgent({
+        id: agentToKeep2Id,
+        name: 'Agent To Keep 2',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      // Verify all agents exist
+      expect(await getAgent({ id: agentToDeleteId })).not.toBeNull();
+      expect(await getAgent({ id: agentToKeep1Id })).not.toBeNull();
+      expect(await getAgent({ id: agentToKeep2Id })).not.toBeNull();
+
+      // Delete one agent
+      await deleteAgent({ id: agentToDeleteId });
+
+      // Verify only the deleted agent is removed, others remain intact
+      expect(await getAgent({ id: agentToDeleteId })).toBeNull();
+      const keptAgent1 = await getAgent({ id: agentToKeep1Id });
+      const keptAgent2 = await getAgent({ id: agentToKeep2Id });
+      expect(keptAgent1).not.toBeNull();
+      expect(keptAgent1.name).toBe('Agent To Keep 1');
+      expect(keptAgent2).not.toBeNull();
+      expect(keptAgent2.name).toBe('Agent To Keep 2');
+    });
+
+    test('should preserve other agents in user favorites when one agent is deleted', async () => {
+      const agentToDeleteId = `agent_${uuidv4()}`;
+      const agentToKeep1Id = `agent_${uuidv4()}`;
+      const agentToKeep2Id = `agent_${uuidv4()}`;
+      const authorId = new mongoose.Types.ObjectId();
+      const userId = new mongoose.Types.ObjectId();
+
+      // Create multiple agents
+      await createAgent({
+        id: agentToDeleteId,
+        name: 'Agent To Delete',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      await createAgent({
+        id: agentToKeep1Id,
+        name: 'Agent To Keep 1',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      await createAgent({
+        id: agentToKeep2Id,
+        name: 'Agent To Keep 2',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      // Create user with all three agents in favorites
+      await User.create({
+        _id: userId,
+        name: 'Test User',
+        email: `test-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [
+          { agentId: agentToDeleteId },
+          { agentId: agentToKeep1Id },
+          { agentId: agentToKeep2Id },
+        ],
+      });
+
+      // Verify user has all three agents in favorites
+      const userBefore = await User.findById(userId);
+      expect(userBefore.favorites).toHaveLength(3);
+
+      // Delete one agent
+      await deleteAgent({ id: agentToDeleteId });
+
+      // Verify only the deleted agent is removed from favorites
+      const userAfter = await User.findById(userId);
+      expect(userAfter.favorites).toHaveLength(2);
+      expect(userAfter.favorites.some((f) => f.agentId === agentToDeleteId)).toBe(false);
+      expect(userAfter.favorites.some((f) => f.agentId === agentToKeep1Id)).toBe(true);
+      expect(userAfter.favorites.some((f) => f.agentId === agentToKeep2Id)).toBe(true);
+    });
+
+    test('should not affect users who do not have deleted agent in favorites', async () => {
+      const agentToDeleteId = `agent_${uuidv4()}`;
+      const otherAgentId = `agent_${uuidv4()}`;
+      const authorId = new mongoose.Types.ObjectId();
+      const userWithDeletedAgentId = new mongoose.Types.ObjectId();
+      const userWithoutDeletedAgentId = new mongoose.Types.ObjectId();
+
+      // Create agents
+      await createAgent({
+        id: agentToDeleteId,
+        name: 'Agent To Delete',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      await createAgent({
+        id: otherAgentId,
+        name: 'Other Agent',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      // Create user with the agent to be deleted
+      await User.create({
+        _id: userWithDeletedAgentId,
+        name: 'User With Deleted Agent',
+        email: `user1-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: agentToDeleteId }, { model: 'gpt-4', endpoint: 'openAI' }],
+      });
+
+      // Create user without the agent to be deleted
+      await User.create({
+        _id: userWithoutDeletedAgentId,
+        name: 'User Without Deleted Agent',
+        email: `user2-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: otherAgentId }, { model: 'claude-3', endpoint: 'anthropic' }],
+      });
+
+      // Delete the agent
+      await deleteAgent({ id: agentToDeleteId });
+
+      // Verify user with deleted agent has it removed
+      const userWithDeleted = await User.findById(userWithDeletedAgentId);
+      expect(userWithDeleted.favorites).toHaveLength(1);
+      expect(userWithDeleted.favorites.some((f) => f.agentId === agentToDeleteId)).toBe(false);
+      expect(userWithDeleted.favorites.some((f) => f.model === 'gpt-4')).toBe(true);
+
+      // Verify user without deleted agent is completely unaffected
+      const userWithoutDeleted = await User.findById(userWithoutDeletedAgentId);
+      expect(userWithoutDeleted.favorites).toHaveLength(2);
+      expect(userWithoutDeleted.favorites.some((f) => f.agentId === otherAgentId)).toBe(true);
+      expect(userWithoutDeleted.favorites.some((f) => f.model === 'claude-3')).toBe(true);
+    });
+
+    test('should remove all user agents from favorites when deleteUserAgents is called', async () => {
       const authorId = new mongoose.Types.ObjectId();
       const otherAuthorId = new mongoose.Types.ObjectId();
+      const userId = new mongoose.Types.ObjectId();
 
-      const agentIds = [];
-      for (let i = 0; i < 5; i++) {
-        const id = `agent_${uuidv4()}`;
-        agentIds.push(id);
-        await createAgent({
-          id,
-          name: `Agent ${i}`,
-          provider: 'test',
-          model: 'test-model',
-          author: authorId,
-        });
-      }
+      const agent1Id = `agent_${uuidv4()}`;
+      const agent2Id = `agent_${uuidv4()}`;
+      const otherAuthorAgentId = `agent_${uuidv4()}`;
 
-      for (let i = 0; i < 3; i++) {
-        await createAgent({
-          id: `other_agent_${uuidv4()}`,
-          name: `Other Agent ${i}`,
-          provider: 'test',
-          model: 'test-model',
-          author: otherAuthorId,
-        });
-      }
+      // Create agents by the author to be deleted
+      await createAgent({
+        id: agent1Id,
+        name: 'Author Agent 1',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
 
-      const result = await getListAgents({ author: authorId.toString() });
+      await createAgent({
+        id: agent2Id,
+        name: 'Author Agent 2',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
 
-      expect(result).toBeDefined();
-      expect(result.data).toBeDefined();
-      expect(result.data).toHaveLength(5);
-      expect(result.has_more).toBe(true);
+      // Create agent by different author (should not be deleted)
+      await createAgent({
+        id: otherAuthorAgentId,
+        name: 'Other Author Agent',
+        provider: 'test',
+        model: 'test-model',
+        author: otherAuthorId,
+      });
 
-      for (const agent of result.data) {
-        expect(agent.author).toBe(authorId.toString());
-      }
+      // Create user with all agents in favorites
+      await User.create({
+        _id: userId,
+        name: 'Test User',
+        email: `test-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [
+          { agentId: agent1Id },
+          { agentId: agent2Id },
+          { agentId: otherAuthorAgentId },
+          { model: 'gpt-4', endpoint: 'openAI' },
+        ],
+      });
+
+      // Verify user has all favorites
+      const userBefore = await User.findById(userId);
+      expect(userBefore.favorites).toHaveLength(4);
+
+      // Delete all agents by the author
+      await deleteUserAgents(authorId.toString());
+
+      // Verify author's agents are deleted from database
+      expect(await getAgent({ id: agent1Id })).toBeNull();
+      expect(await getAgent({ id: agent2Id })).toBeNull();
+
+      // Verify other author's agent still exists
+      expect(await getAgent({ id: otherAuthorAgentId })).not.toBeNull();
+
+      // Verify user favorites: author's agents removed, others remain
+      const userAfter = await User.findById(userId);
+      expect(userAfter.favorites).toHaveLength(2);
+      expect(userAfter.favorites.some((f) => f.agentId === agent1Id)).toBe(false);
+      expect(userAfter.favorites.some((f) => f.agentId === agent2Id)).toBe(false);
+      expect(userAfter.favorites.some((f) => f.agentId === otherAuthorAgentId)).toBe(true);
+      expect(userAfter.favorites.some((f) => f.model === 'gpt-4')).toBe(true);
+    });
+
+    test('should handle deleteUserAgents when agents are in multiple users favorites', async () => {
+      const authorId = new mongoose.Types.ObjectId();
+      const user1Id = new mongoose.Types.ObjectId();
+      const user2Id = new mongoose.Types.ObjectId();
+      const user3Id = new mongoose.Types.ObjectId();
+
+      const agent1Id = `agent_${uuidv4()}`;
+      const agent2Id = `agent_${uuidv4()}`;
+      const unrelatedAgentId = `agent_${uuidv4()}`;
+
+      // Create agents by the author
+      await createAgent({
+        id: agent1Id,
+        name: 'Author Agent 1',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      await createAgent({
+        id: agent2Id,
+        name: 'Author Agent 2',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      // Create users with various favorites configurations
+      await User.create({
+        _id: user1Id,
+        name: 'User 1',
+        email: `user1-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: agent1Id }, { agentId: agent2Id }],
+      });
+
+      await User.create({
+        _id: user2Id,
+        name: 'User 2',
+        email: `user2-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: agent1Id }, { model: 'claude-3', endpoint: 'anthropic' }],
+      });
+
+      await User.create({
+        _id: user3Id,
+        name: 'User 3',
+        email: `user3-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: unrelatedAgentId }, { model: 'gpt-4', endpoint: 'openAI' }],
+      });
+
+      // Delete all agents by the author
+      await deleteUserAgents(authorId.toString());
+
+      // Verify all users' favorites are correctly updated
+      const user1After = await User.findById(user1Id);
+      expect(user1After.favorites).toHaveLength(0);
+
+      const user2After = await User.findById(user2Id);
+      expect(user2After.favorites).toHaveLength(1);
+      expect(user2After.favorites.some((f) => f.agentId === agent1Id)).toBe(false);
+      expect(user2After.favorites.some((f) => f.model === 'claude-3')).toBe(true);
+
+      // User 3 should be completely unaffected
+      const user3After = await User.findById(user3Id);
+      expect(user3After.favorites).toHaveLength(2);
+      expect(user3After.favorites.some((f) => f.agentId === unrelatedAgentId)).toBe(true);
+      expect(user3After.favorites.some((f) => f.model === 'gpt-4')).toBe(true);
+    });
+
+    test('should handle deleteUserAgents when user has no agents', async () => {
+      const authorWithNoAgentsId = new mongoose.Types.ObjectId();
+      const otherAuthorId = new mongoose.Types.ObjectId();
+      const userId = new mongoose.Types.ObjectId();
+
+      const existingAgentId = `agent_${uuidv4()}`;
+
+      // Create agent by different author
+      await createAgent({
+        id: existingAgentId,
+        name: 'Existing Agent',
+        provider: 'test',
+        model: 'test-model',
+        author: otherAuthorId,
+      });
+
+      // Create user with favorites
+      await User.create({
+        _id: userId,
+        name: 'Test User',
+        email: `test-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ agentId: existingAgentId }, { model: 'gpt-4', endpoint: 'openAI' }],
+      });
+
+      // Delete agents for user with no agents (should be a no-op)
+      await deleteUserAgents(authorWithNoAgentsId.toString());
+
+      // Verify existing agent still exists
+      expect(await getAgent({ id: existingAgentId })).not.toBeNull();
+
+      // Verify user favorites are unchanged
+      const userAfter = await User.findById(userId);
+      expect(userAfter.favorites).toHaveLength(2);
+      expect(userAfter.favorites.some((f) => f.agentId === existingAgentId)).toBe(true);
+      expect(userAfter.favorites.some((f) => f.model === 'gpt-4')).toBe(true);
+    });
+
+    test('should handle deleteUserAgents when agents are not in any favorites', async () => {
+      const authorId = new mongoose.Types.ObjectId();
+      const userId = new mongoose.Types.ObjectId();
+
+      const agent1Id = `agent_${uuidv4()}`;
+      const agent2Id = `agent_${uuidv4()}`;
+
+      // Create agents by the author
+      await createAgent({
+        id: agent1Id,
+        name: 'Agent 1',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      await createAgent({
+        id: agent2Id,
+        name: 'Agent 2',
+        provider: 'test',
+        model: 'test-model',
+        author: authorId,
+      });
+
+      // Create user with favorites that don't include these agents
+      await User.create({
+        _id: userId,
+        name: 'Test User',
+        email: `test-${uuidv4()}@example.com`,
+        provider: 'local',
+        favorites: [{ model: 'gpt-4', endpoint: 'openAI' }],
+      });
+
+      // Verify agents exist
+      expect(await getAgent({ id: agent1Id })).not.toBeNull();
+      expect(await getAgent({ id: agent2Id })).not.toBeNull();
+
+      // Delete all agents by the author
+      await deleteUserAgents(authorId.toString());
+
+      // Verify agents are deleted
+      expect(await getAgent({ id: agent1Id })).toBeNull();
+      expect(await getAgent({ id: agent2Id })).toBeNull();
+
+      // Verify user favorites are unchanged
+      const userAfter = await User.findById(userId);
+      expect(userAfter.favorites).toHaveLength(1);
+      expect(userAfter.favorites.some((f) => f.model === 'gpt-4')).toBe(true);
     });
 
     test('should update agent projects', async () => {
@@ -733,26 +1179,6 @@ describe('models/Agent', () => {
         expect(result).toBe(expected);
       });
 
-      test('should handle getListAgents with invalid author format', async () => {
-        try {
-          const result = await getListAgents({ author: 'invalid-object-id' });
-          expect(result.data).toEqual([]);
-        } catch (error) {
-          expect(error).toBeDefined();
-        }
-      });
-
-      test('should handle getListAgents with no agents', async () => {
-        const authorId = new mongoose.Types.ObjectId();
-        const result = await getListAgents({ author: authorId.toString() });
-
-        expect(result).toBeDefined();
-        expect(result.data).toEqual([]);
-        expect(result.has_more).toBe(false);
-        expect(result.first_id).toBeNull();
-        expect(result.last_id).toBeNull();
-      });
-
       test('should handle updateAgentProjects with non-existent agent', async () => {
         const nonExistentId = `agent_${uuidv4()}`;
         const userId = new mongoose.Types.ObjectId();
@@ -2366,17 +2792,6 @@ describe('models/Agent', () => {
       expect(result).toBeNull();
     });
 
-    test('should handle getListAgents with no agents', async () => {
-      const authorId = new mongoose.Types.ObjectId();
-      const result = await getListAgents({ author: authorId.toString() });
-
-      expect(result).toBeDefined();
-      expect(result.data).toEqual([]);
-      expect(result.has_more).toBe(false);
-      expect(result.first_id).toBeNull();
-      expect(result.last_id).toBeNull();
-    });
-
     test('should handle updateAgent with MongoDB operators mixed with direct updates', async () => {
       const agentId = `agent_${uuidv4()}`;
       const authorId = new mongoose.Types.ObjectId();
diff --git a/api/models/Conversation.js b/api/models/Conversation.js
index a8f5f9a36c..32eac1a764 100644
--- a/api/models/Conversation.js
+++ b/api/models/Conversation.js
@@ -124,10 +124,15 @@ module.exports = {
         updateOperation,
         {
           new: true,
-          upsert: true,
+          upsert: metadata?.noUpsert !== true,
         },
       );
 
+      if (!conversation) {
+        logger.debug('[saveConvo] Conversation not found, skipping update');
+        return null;
+      }
+
       return conversation.toObject();
     } catch (error) {
       logger.error('[saveConvo] Error saving conversation', error);
diff --git a/api/models/Conversation.spec.js b/api/models/Conversation.spec.js
index b6237d5f15..bd415b4165 100644
--- a/api/models/Conversation.spec.js
+++ b/api/models/Conversation.spec.js
@@ -106,6 +106,47 @@ describe('Conversation Operations', () => {
       expect(result.conversationId).toBe(newConversationId);
     });
 
+    it('should not create a conversation when noUpsert is true and conversation does not exist', async () => {
+      const nonExistentId = uuidv4();
+      const result = await saveConvo(
+        mockReq,
+        { conversationId: nonExistentId, title: 'Ghost Title' },
+        { noUpsert: true },
+      );
+
+      expect(result).toBeNull();
+
+      const dbConvo = await Conversation.findOne({ conversationId: nonExistentId });
+      expect(dbConvo).toBeNull();
+    });
+
+    it('should update an existing conversation when noUpsert is true', async () => {
+      await saveConvo(mockReq, mockConversationData);
+
+      const result = await saveConvo(
+        mockReq,
+        { conversationId: mockConversationData.conversationId, title: 'Updated Title' },
+        { noUpsert: true },
+      );
+
+      expect(result).not.toBeNull();
+      expect(result.title).toBe('Updated Title');
+      expect(result.conversationId).toBe(mockConversationData.conversationId);
+    });
+
+    it('should still upsert by default when noUpsert is not provided', async () => {
+      const newId = uuidv4();
+      const result = await saveConvo(mockReq, {
+        conversationId: newId,
+        title: 'New Conversation',
+        endpoint: EModelEndpoint.openAI,
+      });
+
+      expect(result).not.toBeNull();
+      expect(result.conversationId).toBe(newId);
+      expect(result.title).toBe('New Conversation');
+    });
+
     it('should handle unsetFields metadata', async () => {
       const metadata = {
         unsetFields: { someField: 1 },
@@ -122,7 +163,6 @@ describe('Conversation Operations', () => {
 
   describe('isTemporary conversation handling', () => {
     it('should save a conversation with expiredAt when isTemporary is true', async () => {
-      // Mock app config with 24 hour retention
       mockReq.config.interfaceConfig.temporaryChatRetention = 24;
 
       mockReq.body = { isTemporary: true };
@@ -135,7 +175,6 @@ describe('Conversation Operations', () => {
       expect(result.expiredAt).toBeDefined();
       expect(result.expiredAt).toBeInstanceOf(Date);
 
-      // Verify expiredAt is approximately 24 hours in the future
       const expectedExpirationTime = new Date(beforeSave.getTime() + 24 * 60 * 60 * 1000);
       const actualExpirationTime = new Date(result.expiredAt);
 
@@ -157,7 +196,6 @@ describe('Conversation Operations', () => {
     });
 
     it('should save a conversation without expiredAt when isTemporary is not provided', async () => {
-      // No isTemporary in body
       mockReq.body = {};
 
       const result = await saveConvo(mockReq, mockConversationData);
@@ -167,7 +205,6 @@ describe('Conversation Operations', () => {
     });
 
     it('should use custom retention period from config', async () => {
-      // Mock app config with 48 hour retention
       mockReq.config.interfaceConfig.temporaryChatRetention = 48;
 
       mockReq.body = { isTemporary: true };
diff --git a/api/models/File.js b/api/models/File.js
index 5e90c86fe4..1a01ef12f9 100644
--- a/api/models/File.js
+++ b/api/models/File.js
@@ -26,7 +26,8 @@ const getFiles = async (filter, _sortOptions, selectFields = { text: 0 }) => {
 };
 
 /**
- * Retrieves tool files (files that are embedded or have a fileIdentifier) from an array of file IDs
+ * Retrieves tool files (files that are embedded or have a fileIdentifier) from an array of file IDs.
+ * Note: execute_code files are handled separately by getCodeGeneratedFiles.
  * @param {string[]} fileIds - Array of file_id strings to search for
  * @param {Set<EToolResources>} toolResourceSet - Optional filter for tool resources
  * @returns {Promise<Array<MongoFile>>} Files that match the criteria
@@ -37,21 +38,25 @@ const getToolFilesByIds = async (fileIds, toolResourceSet) => {
   }
 
   try {
-    const filter = {
-      file_id: { $in: fileIds },
-      $or: [],
-    };
+    const orConditions = [];
 
     if (toolResourceSet.has(EToolResources.context)) {
-      filter.$or.push({ text: { $exists: true, $ne: null }, context: FileContext.agents });
+      orConditions.push({ text: { $exists: true, $ne: null }, context: FileContext.agents });
     }
     if (toolResourceSet.has(EToolResources.file_search)) {
-      filter.$or.push({ embedded: true });
+      orConditions.push({ embedded: true });
     }
-    if (toolResourceSet.has(EToolResources.execute_code)) {
-      filter.$or.push({ 'metadata.fileIdentifier': { $exists: true } });
+
+    if (orConditions.length === 0) {
+      return [];
     }
 
+    const filter = {
+      file_id: { $in: fileIds },
+      context: { $ne: FileContext.execute_code }, // Exclude code-generated files
+      $or: orConditions,
+    };
+
     const selectFields = { text: 0 };
     const sortOptions = { updatedAt: -1 };
 
@@ -62,6 +67,70 @@ const getToolFilesByIds = async (fileIds, toolResourceSet) => {
   }
 };
 
+/**
+ * Retrieves files generated by code execution for a given conversation.
+ * These files are stored locally with fileIdentifier metadata for code env re-upload.
+ * @param {string} conversationId - The conversation ID to search for
+ * @param {string[]} [messageIds] - Optional array of messageIds to filter by (for linear thread filtering)
+ * @returns {Promise<Array<MongoFile>>} Files generated by code execution in the conversation
+ */
+const getCodeGeneratedFiles = async (conversationId, messageIds) => {
+  if (!conversationId) {
+    return [];
+  }
+
+  /** messageIds are required for proper thread filtering of code-generated files */
+  if (!messageIds || messageIds.length === 0) {
+    return [];
+  }
+
+  try {
+    const filter = {
+      conversationId,
+      context: FileContext.execute_code,
+      messageId: { $exists: true, $in: messageIds },
+      'metadata.fileIdentifier': { $exists: true },
+    };
+
+    const selectFields = { text: 0 };
+    const sortOptions = { createdAt: 1 };
+
+    return await getFiles(filter, sortOptions, selectFields);
+  } catch (error) {
+    logger.error('[getCodeGeneratedFiles] Error retrieving code generated files:', error);
+    return [];
+  }
+};
+
+/**
+ * Retrieves user-uploaded execute_code files (not code-generated) by their file IDs.
+ * These are files with fileIdentifier metadata but context is NOT execute_code (e.g., agents or message_attachment).
+ * File IDs should be collected from message.files arrays in the current thread.
+ * @param {string[]} fileIds - Array of file IDs to fetch (from message.files in the thread)
+ * @returns {Promise<Array<MongoFile>>} User-uploaded execute_code files
+ */
+const getUserCodeFiles = async (fileIds) => {
+  if (!fileIds || fileIds.length === 0) {
+    return [];
+  }
+
+  try {
+    const filter = {
+      file_id: { $in: fileIds },
+      context: { $ne: FileContext.execute_code },
+      'metadata.fileIdentifier': { $exists: true },
+    };
+
+    const selectFields = { text: 0 };
+    const sortOptions = { createdAt: 1 };
+
+    return await getFiles(filter, sortOptions, selectFields);
+  } catch (error) {
+    logger.error('[getUserCodeFiles] Error retrieving user code files:', error);
+    return [];
+  }
+};
+
 /**
  * Creates a new file with a TTL of 1 hour.
  * @param {MongoFile} data - The file data to be created, must contain file_id.
@@ -169,6 +238,8 @@ module.exports = {
   findFileById,
   getFiles,
   getToolFilesByIds,
+  getCodeGeneratedFiles,
+  getUserCodeFiles,
   createFile,
   updateFile,
   updateFileUsage,
diff --git a/api/models/Transaction.js b/api/models/Transaction.js
index 5fa20f1ddf..e553e2bb3b 100644
--- a/api/models/Transaction.js
+++ b/api/models/Transaction.js
@@ -138,11 +138,10 @@ const updateBalance = async ({ user, incrementValue, setValues }) => {
 
 /** Method to calculate and set the tokenValue for a transaction */
 function calculateTokenValue(txn) {
-  if (!txn.valueKey || !txn.tokenType) {
-    txn.tokenValue = txn.rawAmount;
-  }
-  const { valueKey, tokenType, model, endpointTokenConfig } = txn;
-  const multiplier = Math.abs(getMultiplier({ valueKey, tokenType, model, endpointTokenConfig }));
+  const { valueKey, tokenType, model, endpointTokenConfig, inputTokenCount } = txn;
+  const multiplier = Math.abs(
+    getMultiplier({ valueKey, tokenType, model, endpointTokenConfig, inputTokenCount }),
+  );
   txn.rate = multiplier;
   txn.tokenValue = txn.rawAmount * multiplier;
   if (txn.context && txn.tokenType === 'completion' && txn.context === 'incomplete') {
@@ -166,6 +165,7 @@ async function createAutoRefillTransaction(txData) {
   }
   const transaction = new Transaction(txData);
   transaction.endpointTokenConfig = txData.endpointTokenConfig;
+  transaction.inputTokenCount = txData.inputTokenCount;
   calculateTokenValue(transaction);
   await transaction.save();
 
@@ -200,6 +200,7 @@ async function createTransaction(_txData) {
 
   const transaction = new Transaction(txData);
   transaction.endpointTokenConfig = txData.endpointTokenConfig;
+  transaction.inputTokenCount = txData.inputTokenCount;
   calculateTokenValue(transaction);
 
   await transaction.save();
@@ -231,10 +232,9 @@ async function createStructuredTransaction(_txData) {
     return;
   }
 
-  const transaction = new Transaction({
-    ...txData,
-    endpointTokenConfig: txData.endpointTokenConfig,
-  });
+  const transaction = new Transaction(txData);
+  transaction.endpointTokenConfig = txData.endpointTokenConfig;
+  transaction.inputTokenCount = txData.inputTokenCount;
 
   calculateStructuredTokenValue(transaction);
 
@@ -266,10 +266,15 @@ function calculateStructuredTokenValue(txn) {
     return;
   }
 
-  const { model, endpointTokenConfig } = txn;
+  const { model, endpointTokenConfig, inputTokenCount } = txn;
 
   if (txn.tokenType === 'prompt') {
-    const inputMultiplier = getMultiplier({ tokenType: 'prompt', model, endpointTokenConfig });
+    const inputMultiplier = getMultiplier({
+      tokenType: 'prompt',
+      model,
+      endpointTokenConfig,
+      inputTokenCount,
+    });
     const writeMultiplier =
       getCacheMultiplier({ cacheType: 'write', model, endpointTokenConfig }) ?? inputMultiplier;
     const readMultiplier =
@@ -304,7 +309,12 @@ function calculateStructuredTokenValue(txn) {
 
     txn.rawAmount = -totalPromptTokens;
   } else if (txn.tokenType === 'completion') {
-    const multiplier = getMultiplier({ tokenType: txn.tokenType, model, endpointTokenConfig });
+    const multiplier = getMultiplier({
+      tokenType: txn.tokenType,
+      model,
+      endpointTokenConfig,
+      inputTokenCount,
+    });
     txn.rate = Math.abs(multiplier);
     txn.tokenValue = -Math.abs(txn.rawAmount) * multiplier;
     txn.rawAmount = -Math.abs(txn.rawAmount);
diff --git a/api/models/Transaction.spec.js b/api/models/Transaction.spec.js
index 2df9fc67f2..4b478d4dc3 100644
--- a/api/models/Transaction.spec.js
+++ b/api/models/Transaction.spec.js
@@ -1,7 +1,7 @@
 const mongoose = require('mongoose');
 const { MongoMemoryServer } = require('mongodb-memory-server');
 const { spendTokens, spendStructuredTokens } = require('./spendTokens');
-const { getMultiplier, getCacheMultiplier } = require('./tx');
+const { getMultiplier, getCacheMultiplier, premiumTokenValues, tokenValues } = require('./tx');
 const { createTransaction, createStructuredTransaction } = require('./Transaction');
 const { Balance, Transaction } = require('~/db/models');
 
@@ -564,3 +564,291 @@ describe('Transactions Config Tests', () => {
     expect(balance.tokenCredits).toBe(initialBalance);
   });
 });
+
+describe('calculateTokenValue Edge Cases', () => {
+  test('should derive multiplier from model when valueKey is not provided', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'gpt-4';
+    const promptTokens = 1000;
+
+    const result = await createTransaction({
+      user: userId,
+      conversationId: 'test-no-valuekey',
+      model,
+      tokenType: 'prompt',
+      rawAmount: -promptTokens,
+      context: 'test',
+      balance: { enabled: true },
+    });
+
+    const expectedRate = getMultiplier({ model, tokenType: 'prompt' });
+    expect(result.rate).toBe(expectedRate);
+
+    const tx = await Transaction.findOne({ user: userId });
+    expect(tx.tokenValue).toBe(-promptTokens * expectedRate);
+    expect(tx.rate).toBe(expectedRate);
+  });
+
+  test('should derive valueKey and apply correct rate for an unknown model with tokenType', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    await createTransaction({
+      user: userId,
+      conversationId: 'test-unknown-model',
+      model: 'some-unrecognized-model-xyz',
+      tokenType: 'prompt',
+      rawAmount: -500,
+      context: 'test',
+      balance: { enabled: true },
+    });
+
+    const tx = await Transaction.findOne({ user: userId });
+    expect(tx.rate).toBeDefined();
+    expect(tx.rate).toBeGreaterThan(0);
+    expect(tx.tokenValue).toBe(tx.rawAmount * tx.rate);
+  });
+
+  test('should correctly apply model-derived multiplier without valueKey for completion', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'claude-opus-4-6';
+    const completionTokens = 500;
+
+    const result = await createTransaction({
+      user: userId,
+      conversationId: 'test-completion-no-valuekey',
+      model,
+      tokenType: 'completion',
+      rawAmount: -completionTokens,
+      context: 'test',
+      balance: { enabled: true },
+    });
+
+    const expectedRate = getMultiplier({ model, tokenType: 'completion' });
+    expect(expectedRate).toBe(tokenValues[model].completion);
+    expect(result.rate).toBe(expectedRate);
+
+    const updatedBalance = await Balance.findOne({ user: userId });
+    expect(updatedBalance.tokenCredits).toBeCloseTo(
+      initialBalance - completionTokens * expectedRate,
+      0,
+    );
+  });
+});
+
+describe('Premium Token Pricing Integration Tests', () => {
+  test('spendTokens should apply standard pricing when prompt tokens are below premium threshold', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'claude-opus-4-6';
+    const promptTokens = 100000;
+    const completionTokens = 500;
+
+    const txData = {
+      user: userId,
+      conversationId: 'test-premium-below',
+      model,
+      context: 'test',
+      endpointTokenConfig: null,
+      balance: { enabled: true },
+    };
+
+    await spendTokens(txData, { promptTokens, completionTokens });
+
+    const standardPromptRate = tokenValues[model].prompt;
+    const standardCompletionRate = tokenValues[model].completion;
+    const expectedCost =
+      promptTokens * standardPromptRate + completionTokens * standardCompletionRate;
+
+    const updatedBalance = await Balance.findOne({ user: userId });
+    expect(updatedBalance.tokenCredits).toBeCloseTo(initialBalance - expectedCost, 0);
+  });
+
+  test('spendTokens should apply premium pricing when prompt tokens exceed premium threshold', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'claude-opus-4-6';
+    const promptTokens = 250000;
+    const completionTokens = 500;
+
+    const txData = {
+      user: userId,
+      conversationId: 'test-premium-above',
+      model,
+      context: 'test',
+      endpointTokenConfig: null,
+      balance: { enabled: true },
+    };
+
+    await spendTokens(txData, { promptTokens, completionTokens });
+
+    const premiumPromptRate = premiumTokenValues[model].prompt;
+    const premiumCompletionRate = premiumTokenValues[model].completion;
+    const expectedCost =
+      promptTokens * premiumPromptRate + completionTokens * premiumCompletionRate;
+
+    const updatedBalance = await Balance.findOne({ user: userId });
+    expect(updatedBalance.tokenCredits).toBeCloseTo(initialBalance - expectedCost, 0);
+  });
+
+  test('spendTokens should apply standard pricing at exactly the premium threshold', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'claude-opus-4-6';
+    const promptTokens = premiumTokenValues[model].threshold;
+    const completionTokens = 500;
+
+    const txData = {
+      user: userId,
+      conversationId: 'test-premium-exact',
+      model,
+      context: 'test',
+      endpointTokenConfig: null,
+      balance: { enabled: true },
+    };
+
+    await spendTokens(txData, { promptTokens, completionTokens });
+
+    const standardPromptRate = tokenValues[model].prompt;
+    const standardCompletionRate = tokenValues[model].completion;
+    const expectedCost =
+      promptTokens * standardPromptRate + completionTokens * standardCompletionRate;
+
+    const updatedBalance = await Balance.findOne({ user: userId });
+    expect(updatedBalance.tokenCredits).toBeCloseTo(initialBalance - expectedCost, 0);
+  });
+
+  test('spendStructuredTokens should apply premium pricing when total input tokens exceed threshold', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'claude-opus-4-6';
+    const txData = {
+      user: userId,
+      conversationId: 'test-structured-premium',
+      model,
+      context: 'message',
+      endpointTokenConfig: null,
+      balance: { enabled: true },
+    };
+
+    const tokenUsage = {
+      promptTokens: {
+        input: 200000,
+        write: 10000,
+        read: 5000,
+      },
+      completionTokens: 1000,
+    };
+
+    const totalInput =
+      tokenUsage.promptTokens.input + tokenUsage.promptTokens.write + tokenUsage.promptTokens.read;
+
+    await spendStructuredTokens(txData, tokenUsage);
+
+    const premiumPromptRate = premiumTokenValues[model].prompt;
+    const premiumCompletionRate = premiumTokenValues[model].completion;
+    const writeMultiplier = getCacheMultiplier({ model, cacheType: 'write' });
+    const readMultiplier = getCacheMultiplier({ model, cacheType: 'read' });
+
+    const expectedPromptCost =
+      tokenUsage.promptTokens.input * premiumPromptRate +
+      tokenUsage.promptTokens.write * writeMultiplier +
+      tokenUsage.promptTokens.read * readMultiplier;
+    const expectedCompletionCost = tokenUsage.completionTokens * premiumCompletionRate;
+    const expectedTotalCost = expectedPromptCost + expectedCompletionCost;
+
+    const updatedBalance = await Balance.findOne({ user: userId });
+    expect(totalInput).toBeGreaterThan(premiumTokenValues[model].threshold);
+    expect(updatedBalance.tokenCredits).toBeCloseTo(initialBalance - expectedTotalCost, 0);
+  });
+
+  test('spendStructuredTokens should apply standard pricing when total input tokens are below threshold', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'claude-opus-4-6';
+    const txData = {
+      user: userId,
+      conversationId: 'test-structured-standard',
+      model,
+      context: 'message',
+      endpointTokenConfig: null,
+      balance: { enabled: true },
+    };
+
+    const tokenUsage = {
+      promptTokens: {
+        input: 50000,
+        write: 10000,
+        read: 5000,
+      },
+      completionTokens: 1000,
+    };
+
+    const totalInput =
+      tokenUsage.promptTokens.input + tokenUsage.promptTokens.write + tokenUsage.promptTokens.read;
+
+    await spendStructuredTokens(txData, tokenUsage);
+
+    const standardPromptRate = tokenValues[model].prompt;
+    const standardCompletionRate = tokenValues[model].completion;
+    const writeMultiplier = getCacheMultiplier({ model, cacheType: 'write' });
+    const readMultiplier = getCacheMultiplier({ model, cacheType: 'read' });
+
+    const expectedPromptCost =
+      tokenUsage.promptTokens.input * standardPromptRate +
+      tokenUsage.promptTokens.write * writeMultiplier +
+      tokenUsage.promptTokens.read * readMultiplier;
+    const expectedCompletionCost = tokenUsage.completionTokens * standardCompletionRate;
+    const expectedTotalCost = expectedPromptCost + expectedCompletionCost;
+
+    const updatedBalance = await Balance.findOne({ user: userId });
+    expect(totalInput).toBeLessThanOrEqual(premiumTokenValues[model].threshold);
+    expect(updatedBalance.tokenCredits).toBeCloseTo(initialBalance - expectedTotalCost, 0);
+  });
+
+  test('non-premium models should not be affected by inputTokenCount regardless of prompt size', async () => {
+    const userId = new mongoose.Types.ObjectId();
+    const initialBalance = 100000000;
+    await Balance.create({ user: userId, tokenCredits: initialBalance });
+
+    const model = 'claude-opus-4-5';
+    const promptTokens = 300000;
+    const completionTokens = 500;
+
+    const txData = {
+      user: userId,
+      conversationId: 'test-no-premium',
+      model,
+      context: 'test',
+      endpointTokenConfig: null,
+      balance: { enabled: true },
+    };
+
+    await spendTokens(txData, { promptTokens, completionTokens });
+
+    const standardPromptRate = getMultiplier({ model, tokenType: 'prompt' });
+    const standardCompletionRate = getMultiplier({ model, tokenType: 'completion' });
+    const expectedCost =
+      promptTokens * standardPromptRate + completionTokens * standardCompletionRate;
+
+    const updatedBalance = await Balance.findOne({ user: userId });
+    expect(updatedBalance.tokenCredits).toBeCloseTo(initialBalance - expectedCost, 0);
+  });
+});
diff --git a/api/models/spendTokens.js b/api/models/spendTokens.js
index cfd983f6bb..afe05969d8 100644
--- a/api/models/spendTokens.js
+++ b/api/models/spendTokens.js
@@ -24,12 +24,14 @@ const spendTokens = async (txData, tokenUsage) => {
     },
   );
   let prompt, completion;
+  const normalizedPromptTokens = Math.max(promptTokens ?? 0, 0);
   try {
     if (promptTokens !== undefined) {
       prompt = await createTransaction({
         ...txData,
         tokenType: 'prompt',
-        rawAmount: promptTokens === 0 ? 0 : -Math.max(promptTokens, 0),
+        rawAmount: promptTokens === 0 ? 0 : -normalizedPromptTokens,
+        inputTokenCount: normalizedPromptTokens,
       });
     }
 
@@ -38,6 +40,7 @@ const spendTokens = async (txData, tokenUsage) => {
         ...txData,
         tokenType: 'completion',
         rawAmount: completionTokens === 0 ? 0 : -Math.max(completionTokens, 0),
+        inputTokenCount: normalizedPromptTokens,
       });
     }
 
@@ -87,21 +90,31 @@ const spendStructuredTokens = async (txData, tokenUsage) => {
   let prompt, completion;
   try {
     if (promptTokens) {
-      const { input = 0, write = 0, read = 0 } = promptTokens;
+      const input = Math.max(promptTokens.input ?? 0, 0);
+      const write = Math.max(promptTokens.write ?? 0, 0);
+      const read = Math.max(promptTokens.read ?? 0, 0);
+      const totalInputTokens = input + write + read;
       prompt = await createStructuredTransaction({
         ...txData,
         tokenType: 'prompt',
         inputTokens: -input,
         writeTokens: -write,
         readTokens: -read,
+        inputTokenCount: totalInputTokens,
       });
     }
 
     if (completionTokens) {
+      const totalInputTokens = promptTokens
+        ? Math.max(promptTokens.input ?? 0, 0) +
+          Math.max(promptTokens.write ?? 0, 0) +
+          Math.max(promptTokens.read ?? 0, 0)
+        : undefined;
       completion = await createTransaction({
         ...txData,
         tokenType: 'completion',
-        rawAmount: -completionTokens,
+        rawAmount: -Math.max(completionTokens, 0),
+        inputTokenCount: totalInputTokens,
       });
     }
 
diff --git a/api/models/spendTokens.spec.js b/api/models/spendTokens.spec.js
index eee6572736..c076d29700 100644
--- a/api/models/spendTokens.spec.js
+++ b/api/models/spendTokens.spec.js
@@ -1,7 +1,8 @@
 const mongoose = require('mongoose');
 const { MongoMemoryServer } = require('mongodb-memory-server');
-const { spendTokens, spendStructuredTokens } = require('./spendTokens');
 const { createTransaction, createAutoRefillTransaction } = require('./Transaction');
+const { tokenValues, premiumTokenValues, getCacheMultiplier } = require('./tx');
+const { spendTokens, spendStructuredTokens } = require('./spendTokens');
 
 require('~/db/models');
 
@@ -734,4 +735,328 @@ describe('spendTokens', () => {
     expect(balance).toBeDefined();
     expect(balance.tokenCredits).toBeLessThan(10000); // Balance should be reduced
   });
+
+  describe('premium token pricing', () => {
+    it('should charge standard rates for claude-opus-4-6 when prompt tokens are below threshold', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-6';
+      const promptTokens = 100000;
+      const completionTokens = 500;
+
+      const txData = {
+        user: userId,
+        conversationId: 'test-standard-pricing',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      await spendTokens(txData, { promptTokens, completionTokens });
+
+      const expectedCost =
+        promptTokens * tokenValues[model].prompt + completionTokens * tokenValues[model].completion;
+
+      const balance = await Balance.findOne({ user: userId });
+      expect(balance.tokenCredits).toBeCloseTo(initialBalance - expectedCost, 0);
+    });
+
+    it('should charge premium rates for claude-opus-4-6 when prompt tokens exceed threshold', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-6';
+      const promptTokens = 250000;
+      const completionTokens = 500;
+
+      const txData = {
+        user: userId,
+        conversationId: 'test-premium-pricing',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      await spendTokens(txData, { promptTokens, completionTokens });
+
+      const expectedCost =
+        promptTokens * premiumTokenValues[model].prompt +
+        completionTokens * premiumTokenValues[model].completion;
+
+      const balance = await Balance.findOne({ user: userId });
+      expect(balance.tokenCredits).toBeCloseTo(initialBalance - expectedCost, 0);
+    });
+
+    it('should charge premium rates for both prompt and completion in structured tokens when above threshold', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-6';
+      const txData = {
+        user: userId,
+        conversationId: 'test-structured-premium',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      const tokenUsage = {
+        promptTokens: {
+          input: 200000,
+          write: 10000,
+          read: 5000,
+        },
+        completionTokens: 1000,
+      };
+
+      const result = await spendStructuredTokens(txData, tokenUsage);
+
+      const premiumPromptRate = premiumTokenValues[model].prompt;
+      const premiumCompletionRate = premiumTokenValues[model].completion;
+      const writeRate = getCacheMultiplier({ model, cacheType: 'write' });
+      const readRate = getCacheMultiplier({ model, cacheType: 'read' });
+
+      const expectedPromptCost =
+        tokenUsage.promptTokens.input * premiumPromptRate +
+        tokenUsage.promptTokens.write * writeRate +
+        tokenUsage.promptTokens.read * readRate;
+      const expectedCompletionCost = tokenUsage.completionTokens * premiumCompletionRate;
+
+      expect(result.prompt.prompt).toBeCloseTo(-expectedPromptCost, 0);
+      expect(result.completion.completion).toBeCloseTo(-expectedCompletionCost, 0);
+    });
+
+    it('should charge standard rates for structured tokens when below threshold', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-6';
+      const txData = {
+        user: userId,
+        conversationId: 'test-structured-standard',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      const tokenUsage = {
+        promptTokens: {
+          input: 50000,
+          write: 10000,
+          read: 5000,
+        },
+        completionTokens: 1000,
+      };
+
+      const result = await spendStructuredTokens(txData, tokenUsage);
+
+      const standardPromptRate = tokenValues[model].prompt;
+      const standardCompletionRate = tokenValues[model].completion;
+      const writeRate = getCacheMultiplier({ model, cacheType: 'write' });
+      const readRate = getCacheMultiplier({ model, cacheType: 'read' });
+
+      const expectedPromptCost =
+        tokenUsage.promptTokens.input * standardPromptRate +
+        tokenUsage.promptTokens.write * writeRate +
+        tokenUsage.promptTokens.read * readRate;
+      const expectedCompletionCost = tokenUsage.completionTokens * standardCompletionRate;
+
+      expect(result.prompt.prompt).toBeCloseTo(-expectedPromptCost, 0);
+      expect(result.completion.completion).toBeCloseTo(-expectedCompletionCost, 0);
+    });
+
+    it('should not apply premium pricing to non-premium models regardless of prompt size', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-5';
+      const promptTokens = 300000;
+      const completionTokens = 500;
+
+      const txData = {
+        user: userId,
+        conversationId: 'test-no-premium',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      await spendTokens(txData, { promptTokens, completionTokens });
+
+      const expectedCost =
+        promptTokens * tokenValues[model].prompt + completionTokens * tokenValues[model].completion;
+
+      const balance = await Balance.findOne({ user: userId });
+      expect(balance.tokenCredits).toBeCloseTo(initialBalance - expectedCost, 0);
+    });
+  });
+
+  describe('inputTokenCount Normalization', () => {
+    it('should normalize negative promptTokens to zero for inputTokenCount', async () => {
+      await Balance.create({
+        user: userId,
+        tokenCredits: 100000000,
+      });
+
+      const txData = {
+        user: userId,
+        conversationId: 'test-negative-prompt',
+        model: 'claude-opus-4-6',
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      await spendTokens(txData, { promptTokens: -500, completionTokens: 100 });
+
+      const transactions = await Transaction.find({ user: userId }).sort({ tokenType: 1 });
+
+      const completionTx = transactions.find((t) => t.tokenType === 'completion');
+      const promptTx = transactions.find((t) => t.tokenType === 'prompt');
+
+      expect(Math.abs(promptTx.rawAmount)).toBe(0);
+      expect(completionTx.rawAmount).toBe(-100);
+
+      const standardCompletionRate = tokenValues['claude-opus-4-6'].completion;
+      expect(completionTx.rate).toBe(standardCompletionRate);
+    });
+
+    it('should use normalized inputTokenCount for premium threshold check on completion', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-6';
+      const promptTokens = 250000;
+      const completionTokens = 500;
+
+      const txData = {
+        user: userId,
+        conversationId: 'test-normalized-premium',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      await spendTokens(txData, { promptTokens, completionTokens });
+
+      const transactions = await Transaction.find({ user: userId }).sort({ tokenType: 1 });
+      const completionTx = transactions.find((t) => t.tokenType === 'completion');
+      const promptTx = transactions.find((t) => t.tokenType === 'prompt');
+
+      const premiumPromptRate = premiumTokenValues[model].prompt;
+      const premiumCompletionRate = premiumTokenValues[model].completion;
+      expect(promptTx.rate).toBe(premiumPromptRate);
+      expect(completionTx.rate).toBe(premiumCompletionRate);
+    });
+
+    it('should keep inputTokenCount as zero when promptTokens is zero', async () => {
+      await Balance.create({
+        user: userId,
+        tokenCredits: 100000000,
+      });
+
+      const txData = {
+        user: userId,
+        conversationId: 'test-zero-prompt',
+        model: 'claude-opus-4-6',
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      await spendTokens(txData, { promptTokens: 0, completionTokens: 100 });
+
+      const transactions = await Transaction.find({ user: userId }).sort({ tokenType: 1 });
+      const completionTx = transactions.find((t) => t.tokenType === 'completion');
+      const promptTx = transactions.find((t) => t.tokenType === 'prompt');
+
+      expect(Math.abs(promptTx.rawAmount)).toBe(0);
+
+      const standardCompletionRate = tokenValues['claude-opus-4-6'].completion;
+      expect(completionTx.rate).toBe(standardCompletionRate);
+    });
+
+    it('should not trigger premium pricing with negative promptTokens on premium model', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-6';
+      const txData = {
+        user: userId,
+        conversationId: 'test-negative-no-premium',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      await spendTokens(txData, { promptTokens: -300000, completionTokens: 500 });
+
+      const transactions = await Transaction.find({ user: userId }).sort({ tokenType: 1 });
+      const completionTx = transactions.find((t) => t.tokenType === 'completion');
+
+      const standardCompletionRate = tokenValues[model].completion;
+      expect(completionTx.rate).toBe(standardCompletionRate);
+    });
+
+    it('should normalize negative structured token values to zero in spendStructuredTokens', async () => {
+      const initialBalance = 100000000;
+      await Balance.create({
+        user: userId,
+        tokenCredits: initialBalance,
+      });
+
+      const model = 'claude-opus-4-6';
+      const txData = {
+        user: userId,
+        conversationId: 'test-negative-structured',
+        model,
+        context: 'test',
+        balance: { enabled: true },
+      };
+
+      const tokenUsage = {
+        promptTokens: { input: -100, write: 50, read: -30 },
+        completionTokens: -200,
+      };
+
+      await spendStructuredTokens(txData, tokenUsage);
+
+      const transactions = await Transaction.find({
+        user: userId,
+        conversationId: 'test-negative-structured',
+      }).sort({ tokenType: 1 });
+
+      const completionTx = transactions.find((t) => t.tokenType === 'completion');
+      const promptTx = transactions.find((t) => t.tokenType === 'prompt');
+
+      expect(Math.abs(promptTx.inputTokens)).toBe(0);
+      expect(promptTx.writeTokens).toBe(-50);
+      expect(Math.abs(promptTx.readTokens)).toBe(0);
+
+      expect(Math.abs(completionTx.rawAmount)).toBe(0);
+
+      const standardRate = tokenValues[model].completion;
+      expect(completionTx.rate).toBe(standardRate);
+    });
+  });
 });
diff --git a/api/models/tx.js b/api/models/tx.js
index 6ff105a458..9a6305ec5c 100644
--- a/api/models/tx.js
+++ b/api/models/tx.js
@@ -1,10 +1,40 @@
 const { matchModelName, findMatchingPattern } = require('@librechat/api');
 const defaultRate = 6;
 
+/**
+ * Token Pricing Configuration
+ *
+ * IMPORTANT: Key Ordering for Pattern Matching
+ * ============================================
+ * The `findMatchingPattern` function iterates through object keys in REVERSE order
+ * (last-defined keys are checked first) and uses `modelName.includes(key)` for matching.
+ *
+ * This means:
+ * 1. BASE PATTERNS must be defined FIRST (e.g., "kimi", "moonshot")
+ * 2. SPECIFIC PATTERNS must be defined AFTER their base patterns (e.g., "kimi-k2", "kimi-k2.5")
+ *
+ * Example ordering for Kimi models:
+ *   kimi: { prompt: 0.6, completion: 2.5 },       // Base pattern - checked last
+ *   'kimi-k2': { prompt: 0.6, completion: 2.5 },  // More specific - checked before "kimi"
+ *   'kimi-k2.5': { prompt: 0.6, completion: 3.0 }, // Most specific - checked first
+ *
+ * Why this matters:
+ * - Model name "kimi-k2.5" contains both "kimi" and "kimi-k2" as substrings
+ * - If "kimi" were checked first, it would incorrectly match and return wrong pricing
+ * - By defining specific patterns AFTER base patterns, they're checked first in reverse iteration
+ *
+ * This applies to BOTH `tokenValues` and `cacheTokenValues` objects.
+ *
+ * When adding new model families:
+ * 1. Define the base/generic pattern first
+ * 2. Define increasingly specific patterns after
+ * 3. Ensure no pattern is a substring of another that should match differently
+ */
+
 /**
  * AWS Bedrock pricing
  * source: https://aws.amazon.com/bedrock/pricing/
- * */
+ */
 const bedrockValues = {
   // Basic llama2 patterns (base defaults to smallest variant)
   llama2: { prompt: 0.75, completion: 1.0 },
@@ -80,6 +110,11 @@ const bedrockValues = {
   'nova-pro': { prompt: 0.8, completion: 3.2 },
   'nova-premier': { prompt: 2.5, completion: 12.5 },
   'deepseek.r1': { prompt: 1.35, completion: 5.4 },
+  // Moonshot/Kimi models on Bedrock
+  'moonshot.kimi': { prompt: 0.6, completion: 2.5 },
+  'moonshot.kimi-k2': { prompt: 0.6, completion: 2.5 },
+  'moonshot.kimi-k2.5': { prompt: 0.6, completion: 3.0 },
+  'moonshot.kimi-k2-thinking': { prompt: 0.6, completion: 2.5 },
 };
 
 /**
@@ -139,7 +174,9 @@ const tokenValues = Object.assign(
     'claude-haiku-4-5': { prompt: 1, completion: 5 },
     'claude-opus-4': { prompt: 15, completion: 75 },
     'claude-opus-4-5': { prompt: 5, completion: 25 },
+    'claude-opus-4-6': { prompt: 5, completion: 25 },
     'claude-sonnet-4': { prompt: 3, completion: 15 },
+    'claude-sonnet-4-6': { prompt: 3, completion: 15 },
     'command-r': { prompt: 0.5, completion: 1.5 },
     'command-r-plus': { prompt: 3, completion: 15 },
     'command-text': { prompt: 1.5, completion: 2.0 },
@@ -189,7 +226,31 @@ const tokenValues = Object.assign(
     'pixtral-large': { prompt: 2.0, completion: 6.0 },
     'mistral-large': { prompt: 2.0, completion: 6.0 },
     'mixtral-8x22b': { prompt: 0.65, completion: 0.65 },
-    kimi: { prompt: 0.14, completion: 2.49 }, // Base pattern (using kimi-k2 pricing)
+    // Moonshot/Kimi models (base patterns first, specific patterns last for correct matching)
+    kimi: { prompt: 0.6, completion: 2.5 }, // Base pattern
+    moonshot: { prompt: 2.0, completion: 5.0 }, // Base pattern (using 128k pricing)
+    'kimi-latest': { prompt: 0.2, completion: 2.0 }, // Uses 8k/32k/128k pricing dynamically
+    'kimi-k2': { prompt: 0.6, completion: 2.5 },
+    'kimi-k2.5': { prompt: 0.6, completion: 3.0 },
+    'kimi-k2-turbo': { prompt: 1.15, completion: 8.0 },
+    'kimi-k2-turbo-preview': { prompt: 1.15, completion: 8.0 },
+    'kimi-k2-0905': { prompt: 0.6, completion: 2.5 },
+    'kimi-k2-0905-preview': { prompt: 0.6, completion: 2.5 },
+    'kimi-k2-0711': { prompt: 0.6, completion: 2.5 },
+    'kimi-k2-0711-preview': { prompt: 0.6, completion: 2.5 },
+    'kimi-k2-thinking': { prompt: 0.6, completion: 2.5 },
+    'kimi-k2-thinking-turbo': { prompt: 1.15, completion: 8.0 },
+    'moonshot-v1': { prompt: 2.0, completion: 5.0 },
+    'moonshot-v1-auto': { prompt: 2.0, completion: 5.0 },
+    'moonshot-v1-8k': { prompt: 0.2, completion: 2.0 },
+    'moonshot-v1-8k-vision': { prompt: 0.2, completion: 2.0 },
+    'moonshot-v1-8k-vision-preview': { prompt: 0.2, completion: 2.0 },
+    'moonshot-v1-32k': { prompt: 1.0, completion: 3.0 },
+    'moonshot-v1-32k-vision': { prompt: 1.0, completion: 3.0 },
+    'moonshot-v1-32k-vision-preview': { prompt: 1.0, completion: 3.0 },
+    'moonshot-v1-128k': { prompt: 2.0, completion: 5.0 },
+    'moonshot-v1-128k-vision': { prompt: 2.0, completion: 5.0 },
+    'moonshot-v1-128k-vision-preview': { prompt: 2.0, completion: 5.0 },
     // GPT-OSS models (specific sizes)
     'gpt-oss:20b': { prompt: 0.05, completion: 0.2 },
     'gpt-oss-20b': { prompt: 0.05, completion: 0.2 },
@@ -249,12 +310,36 @@ const cacheTokenValues = {
   'claude-3-haiku': { write: 0.3, read: 0.03 },
   'claude-haiku-4-5': { write: 1.25, read: 0.1 },
   'claude-sonnet-4': { write: 3.75, read: 0.3 },
+  'claude-sonnet-4-6': { write: 3.75, read: 0.3 },
   'claude-opus-4': { write: 18.75, read: 1.5 },
   'claude-opus-4-5': { write: 6.25, read: 0.5 },
+  'claude-opus-4-6': { write: 6.25, read: 0.5 },
   // DeepSeek models - cache hit: $0.028/1M, cache miss: $0.28/1M
   deepseek: { write: 0.28, read: 0.028 },
   'deepseek-chat': { write: 0.28, read: 0.028 },
   'deepseek-reasoner': { write: 0.28, read: 0.028 },
+  // Moonshot/Kimi models - cache hit: $0.15/1M (k2) or $0.10/1M (k2.5), cache miss: $0.60/1M
+  kimi: { write: 0.6, read: 0.15 },
+  'kimi-k2': { write: 0.6, read: 0.15 },
+  'kimi-k2.5': { write: 0.6, read: 0.1 },
+  'kimi-k2-turbo': { write: 1.15, read: 0.15 },
+  'kimi-k2-turbo-preview': { write: 1.15, read: 0.15 },
+  'kimi-k2-0905': { write: 0.6, read: 0.15 },
+  'kimi-k2-0905-preview': { write: 0.6, read: 0.15 },
+  'kimi-k2-0711': { write: 0.6, read: 0.15 },
+  'kimi-k2-0711-preview': { write: 0.6, read: 0.15 },
+  'kimi-k2-thinking': { write: 0.6, read: 0.15 },
+  'kimi-k2-thinking-turbo': { write: 1.15, read: 0.15 },
+};
+
+/**
+ * Premium (tiered) pricing for models whose rates change based on prompt size.
+ * Each entry specifies the token threshold and the rates that apply above it.
+ * @type {Object.<string, {threshold: number, prompt: number, completion: number}>}
+ */
+const premiumTokenValues = {
+  'claude-opus-4-6': { threshold: 200000, prompt: 10, completion: 37.5 },
+  'claude-sonnet-4-6': { threshold: 200000, prompt: 6, completion: 22.5 },
 };
 
 /**
@@ -313,15 +398,27 @@ const getValueKey = (model, endpoint) => {
  * @param {string} [params.model] - The model name to derive the value key from if not provided.
  * @param {string} [params.endpoint] - The endpoint name to derive the value key from if not provided.
  * @param {EndpointTokenConfig} [params.endpointTokenConfig] - The token configuration for the endpoint.
+ * @param {number} [params.inputTokenCount] - Total input token count for tiered pricing.
  * @returns {number} The multiplier for the given parameters, or a default value if not found.
  */
-const getMultiplier = ({ valueKey, tokenType, model, endpoint, endpointTokenConfig }) => {
+const getMultiplier = ({
+  model,
+  valueKey,
+  endpoint,
+  tokenType,
+  inputTokenCount,
+  endpointTokenConfig,
+}) => {
   if (endpointTokenConfig) {
     return endpointTokenConfig?.[model]?.[tokenType] ?? defaultRate;
   }
 
   if (valueKey && tokenType) {
-    return tokenValues[valueKey][tokenType] ?? defaultRate;
+    const premiumRate = getPremiumRate(valueKey, tokenType, inputTokenCount);
+    if (premiumRate != null) {
+      return premiumRate;
+    }
+    return tokenValues[valueKey]?.[tokenType] ?? defaultRate;
   }
 
   if (!tokenType || !model) {
@@ -333,10 +430,33 @@ const getMultiplier = ({ valueKey, tokenType, model, endpoint, endpointTokenConf
     return defaultRate;
   }
 
-  // If we got this far, and values[tokenType] is undefined somehow, return a rough average of default multipliers
+  const premiumRate = getPremiumRate(valueKey, tokenType, inputTokenCount);
+  if (premiumRate != null) {
+    return premiumRate;
+  }
+
   return tokenValues[valueKey]?.[tokenType] ?? defaultRate;
 };
 
+/**
+ * Checks if premium (tiered) pricing applies and returns the premium rate.
+ * Each model defines its own threshold in `premiumTokenValues`.
+ * @param {string} valueKey
+ * @param {string} tokenType
+ * @param {number} [inputTokenCount]
+ * @returns {number|null}
+ */
+const getPremiumRate = (valueKey, tokenType, inputTokenCount) => {
+  if (inputTokenCount == null) {
+    return null;
+  }
+  const premiumEntry = premiumTokenValues[valueKey];
+  if (!premiumEntry || inputTokenCount <= premiumEntry.threshold) {
+    return null;
+  }
+  return premiumEntry[tokenType] ?? null;
+};
+
 /**
  * Retrieves the cache multiplier for a given value key and token type. If no value key is provided,
  * it attempts to derive it from the model name.
@@ -373,8 +493,10 @@ const getCacheMultiplier = ({ valueKey, cacheType, model, endpoint, endpointToke
 
 module.exports = {
   tokenValues,
+  premiumTokenValues,
   getValueKey,
   getMultiplier,
+  getPremiumRate,
   getCacheMultiplier,
   defaultRate,
   cacheTokenValues,
diff --git a/api/models/tx.spec.js b/api/models/tx.spec.js
index f70a6af47c..df1bec8619 100644
--- a/api/models/tx.spec.js
+++ b/api/models/tx.spec.js
@@ -1,3 +1,4 @@
+/** Note: No hard-coded values should be used in this file. */
 const { maxTokensMap } = require('@librechat/api');
 const { EModelEndpoint } = require('librechat-data-provider');
 const {
@@ -5,8 +6,10 @@ const {
   tokenValues,
   getValueKey,
   getMultiplier,
+  getPremiumRate,
   cacheTokenValues,
   getCacheMultiplier,
+  premiumTokenValues,
 } = require('./tx');
 
 describe('getValueKey', () => {
@@ -239,6 +242,15 @@ describe('getMultiplier', () => {
     expect(getMultiplier({ valueKey: '8k', tokenType: 'unknownType' })).toBe(defaultRate);
   });
 
+  it('should return defaultRate if valueKey does not exist in tokenValues', () => {
+    expect(getMultiplier({ valueKey: 'non-existent-model', tokenType: 'prompt' })).toBe(
+      defaultRate,
+    );
+    expect(getMultiplier({ valueKey: 'non-existent-model', tokenType: 'completion' })).toBe(
+      defaultRate,
+    );
+  });
+
   it('should derive the valueKey from the model if not provided', () => {
     expect(getMultiplier({ tokenType: 'prompt', model: 'gpt-4-some-other-info' })).toBe(
       tokenValues['8k'].prompt,
@@ -334,8 +346,6 @@ describe('getMultiplier', () => {
     expect(getMultiplier({ model: 'openai/gpt-5.1', tokenType: 'prompt' })).toBe(
       tokenValues['gpt-5.1'].prompt,
     );
-    expect(tokenValues['gpt-5.1'].prompt).toBe(1.25);
-    expect(tokenValues['gpt-5.1'].completion).toBe(10);
   });
 
   it('should return the correct multiplier for gpt-5.2', () => {
@@ -348,8 +358,6 @@ describe('getMultiplier', () => {
     expect(getMultiplier({ model: 'openai/gpt-5.2', tokenType: 'prompt' })).toBe(
       tokenValues['gpt-5.2'].prompt,
     );
-    expect(tokenValues['gpt-5.2'].prompt).toBe(1.75);
-    expect(tokenValues['gpt-5.2'].completion).toBe(14);
   });
 
   it('should return the correct multiplier for gpt-4o', () => {
@@ -815,8 +823,6 @@ describe('Deepseek Model Tests', () => {
     expect(getMultiplier({ model: 'deepseek-chat', tokenType: 'completion' })).toBe(
       tokenValues['deepseek-chat'].completion,
     );
-    expect(tokenValues['deepseek-chat'].prompt).toBe(0.28);
-    expect(tokenValues['deepseek-chat'].completion).toBe(0.42);
   });
 
   it('should return correct pricing for deepseek-reasoner', () => {
@@ -826,8 +832,6 @@ describe('Deepseek Model Tests', () => {
     expect(getMultiplier({ model: 'deepseek-reasoner', tokenType: 'completion' })).toBe(
       tokenValues['deepseek-reasoner'].completion,
     );
-    expect(tokenValues['deepseek-reasoner'].prompt).toBe(0.28);
-    expect(tokenValues['deepseek-reasoner'].completion).toBe(0.42);
   });
 
   it('should handle DeepSeek model name variations with provider prefixes', () => {
@@ -840,8 +844,8 @@ describe('Deepseek Model Tests', () => {
     modelVariations.forEach((model) => {
       const promptMultiplier = getMultiplier({ model, tokenType: 'prompt' });
       const completionMultiplier = getMultiplier({ model, tokenType: 'completion' });
-      expect(promptMultiplier).toBe(0.28);
-      expect(completionMultiplier).toBe(0.42);
+      expect(promptMultiplier).toBe(tokenValues['deepseek-chat'].prompt);
+      expect(completionMultiplier).toBe(tokenValues['deepseek-chat'].completion);
     });
   });
 
@@ -860,13 +864,13 @@ describe('Deepseek Model Tests', () => {
     );
   });
 
-  it('should return correct cache pricing values for DeepSeek models', () => {
-    expect(cacheTokenValues['deepseek-chat'].write).toBe(0.28);
-    expect(cacheTokenValues['deepseek-chat'].read).toBe(0.028);
-    expect(cacheTokenValues['deepseek-reasoner'].write).toBe(0.28);
-    expect(cacheTokenValues['deepseek-reasoner'].read).toBe(0.028);
-    expect(cacheTokenValues['deepseek'].write).toBe(0.28);
-    expect(cacheTokenValues['deepseek'].read).toBe(0.028);
+  it('should have consistent cache pricing across DeepSeek model variants', () => {
+    expect(cacheTokenValues['deepseek'].write).toBe(cacheTokenValues['deepseek-chat'].write);
+    expect(cacheTokenValues['deepseek'].read).toBe(cacheTokenValues['deepseek-chat'].read);
+    expect(cacheTokenValues['deepseek-reasoner'].write).toBe(
+      cacheTokenValues['deepseek-chat'].write,
+    );
+    expect(cacheTokenValues['deepseek-reasoner'].read).toBe(cacheTokenValues['deepseek-chat'].read);
   });
 
   it('should handle DeepSeek cache multipliers with model variations', () => {
@@ -875,8 +879,195 @@ describe('Deepseek Model Tests', () => {
     modelVariations.forEach((model) => {
       const writeMultiplier = getCacheMultiplier({ model, cacheType: 'write' });
       const readMultiplier = getCacheMultiplier({ model, cacheType: 'read' });
-      expect(writeMultiplier).toBe(0.28);
-      expect(readMultiplier).toBe(0.028);
+      expect(writeMultiplier).toBe(cacheTokenValues['deepseek-chat'].write);
+      expect(readMultiplier).toBe(cacheTokenValues['deepseek-chat'].read);
+    });
+  });
+});
+
+describe('Moonshot/Kimi Model Tests - Pricing', () => {
+  describe('Kimi Models', () => {
+    it('should return correct pricing for kimi base pattern', () => {
+      expect(getMultiplier({ model: 'kimi', tokenType: 'prompt' })).toBe(
+        tokenValues['kimi'].prompt,
+      );
+      expect(getMultiplier({ model: 'kimi', tokenType: 'completion' })).toBe(
+        tokenValues['kimi'].completion,
+      );
+    });
+
+    it('should return correct pricing for kimi-k2.5', () => {
+      expect(getMultiplier({ model: 'kimi-k2.5', tokenType: 'prompt' })).toBe(
+        tokenValues['kimi-k2.5'].prompt,
+      );
+      expect(getMultiplier({ model: 'kimi-k2.5', tokenType: 'completion' })).toBe(
+        tokenValues['kimi-k2.5'].completion,
+      );
+    });
+
+    it('should return correct pricing for kimi-k2 series', () => {
+      expect(getMultiplier({ model: 'kimi-k2', tokenType: 'prompt' })).toBe(
+        tokenValues['kimi-k2'].prompt,
+      );
+      expect(getMultiplier({ model: 'kimi-k2', tokenType: 'completion' })).toBe(
+        tokenValues['kimi-k2'].completion,
+      );
+    });
+
+    it('should return correct pricing for kimi-k2-turbo (higher pricing)', () => {
+      expect(getMultiplier({ model: 'kimi-k2-turbo', tokenType: 'prompt' })).toBe(
+        tokenValues['kimi-k2-turbo'].prompt,
+      );
+      expect(getMultiplier({ model: 'kimi-k2-turbo', tokenType: 'completion' })).toBe(
+        tokenValues['kimi-k2-turbo'].completion,
+      );
+    });
+
+    it('should return correct pricing for kimi-k2-thinking models', () => {
+      expect(getMultiplier({ model: 'kimi-k2-thinking', tokenType: 'prompt' })).toBe(
+        tokenValues['kimi-k2-thinking'].prompt,
+      );
+      expect(getMultiplier({ model: 'kimi-k2-thinking', tokenType: 'completion' })).toBe(
+        tokenValues['kimi-k2-thinking'].completion,
+      );
+      expect(getMultiplier({ model: 'kimi-k2-thinking-turbo', tokenType: 'prompt' })).toBe(
+        tokenValues['kimi-k2-thinking-turbo'].prompt,
+      );
+      expect(getMultiplier({ model: 'kimi-k2-thinking-turbo', tokenType: 'completion' })).toBe(
+        tokenValues['kimi-k2-thinking-turbo'].completion,
+      );
+    });
+
+    it('should handle Kimi model variations with provider prefixes', () => {
+      const modelVariations = ['openrouter/kimi-k2', 'openrouter/kimi-k2.5', 'openrouter/kimi'];
+
+      modelVariations.forEach((model) => {
+        const promptMultiplier = getMultiplier({ model, tokenType: 'prompt' });
+        const completionMultiplier = getMultiplier({ model, tokenType: 'completion' });
+        expect(promptMultiplier).toBe(tokenValues['kimi'].prompt);
+        expect([tokenValues['kimi'].completion, tokenValues['kimi-k2.5'].completion]).toContain(
+          completionMultiplier,
+        );
+      });
+    });
+  });
+
+  describe('Moonshot Models', () => {
+    it('should return correct pricing for moonshot base pattern (128k pricing)', () => {
+      expect(getMultiplier({ model: 'moonshot', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot'].completion,
+      );
+    });
+
+    it('should return correct pricing for moonshot-v1-8k', () => {
+      expect(getMultiplier({ model: 'moonshot-v1-8k', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot-v1-8k'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-8k', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot-v1-8k'].completion,
+      );
+    });
+
+    it('should return correct pricing for moonshot-v1-32k', () => {
+      expect(getMultiplier({ model: 'moonshot-v1-32k', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot-v1-32k'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-32k', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot-v1-32k'].completion,
+      );
+    });
+
+    it('should return correct pricing for moonshot-v1-128k', () => {
+      expect(getMultiplier({ model: 'moonshot-v1-128k', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot-v1-128k'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-128k', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot-v1-128k'].completion,
+      );
+    });
+
+    it('should return correct pricing for moonshot-v1 vision models', () => {
+      expect(getMultiplier({ model: 'moonshot-v1-8k-vision', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot-v1-8k-vision'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-8k-vision', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot-v1-8k-vision'].completion,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-32k-vision', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot-v1-32k-vision'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-32k-vision', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot-v1-32k-vision'].completion,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-128k-vision', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot-v1-128k-vision'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot-v1-128k-vision', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot-v1-128k-vision'].completion,
+      );
+    });
+  });
+
+  describe('Kimi Cache Multipliers', () => {
+    it('should return correct cache multipliers for kimi-k2 models', () => {
+      expect(getCacheMultiplier({ model: 'kimi', cacheType: 'write' })).toBe(
+        cacheTokenValues['kimi'].write,
+      );
+      expect(getCacheMultiplier({ model: 'kimi', cacheType: 'read' })).toBe(
+        cacheTokenValues['kimi'].read,
+      );
+    });
+
+    it('should return correct cache multipliers for kimi-k2.5 (lower read price)', () => {
+      expect(getCacheMultiplier({ model: 'kimi-k2.5', cacheType: 'write' })).toBe(
+        cacheTokenValues['kimi-k2.5'].write,
+      );
+      expect(getCacheMultiplier({ model: 'kimi-k2.5', cacheType: 'read' })).toBe(
+        cacheTokenValues['kimi-k2.5'].read,
+      );
+    });
+
+    it('should return correct cache multipliers for kimi-k2-turbo', () => {
+      expect(getCacheMultiplier({ model: 'kimi-k2-turbo', cacheType: 'write' })).toBe(
+        cacheTokenValues['kimi-k2-turbo'].write,
+      );
+      expect(getCacheMultiplier({ model: 'kimi-k2-turbo', cacheType: 'read' })).toBe(
+        cacheTokenValues['kimi-k2-turbo'].read,
+      );
+    });
+
+    it('should handle Kimi cache multipliers with model variations', () => {
+      const modelVariations = ['openrouter/kimi-k2', 'openrouter/kimi'];
+
+      modelVariations.forEach((model) => {
+        const writeMultiplier = getCacheMultiplier({ model, cacheType: 'write' });
+        const readMultiplier = getCacheMultiplier({ model, cacheType: 'read' });
+        expect(writeMultiplier).toBe(cacheTokenValues['kimi'].write);
+        expect(readMultiplier).toBe(cacheTokenValues['kimi'].read);
+      });
+    });
+  });
+
+  describe('Bedrock Moonshot Models', () => {
+    it('should return correct pricing for Bedrock moonshot models', () => {
+      expect(getMultiplier({ model: 'moonshot.kimi', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot.kimi'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot.kimi', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot.kimi'].completion,
+      );
+      expect(getMultiplier({ model: 'moonshot.kimi-k2', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot.kimi-k2'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot.kimi-k2.5', tokenType: 'prompt' })).toBe(
+        tokenValues['moonshot.kimi-k2.5'].prompt,
+      );
+      expect(getMultiplier({ model: 'moonshot.kimi-k2.5', tokenType: 'completion' })).toBe(
+        tokenValues['moonshot.kimi-k2.5'].completion,
+      );
     });
   });
 });
@@ -1689,6 +1880,201 @@ describe('Claude Model Tests', () => {
       );
     });
   });
+
+  it('should return correct prompt and completion rates for Claude Opus 4.6', () => {
+    expect(getMultiplier({ model: 'claude-opus-4-6', tokenType: 'prompt' })).toBe(
+      tokenValues['claude-opus-4-6'].prompt,
+    );
+    expect(getMultiplier({ model: 'claude-opus-4-6', tokenType: 'completion' })).toBe(
+      tokenValues['claude-opus-4-6'].completion,
+    );
+  });
+
+  it('should handle Claude Opus 4.6 model name variations', () => {
+    const modelVariations = [
+      'claude-opus-4-6',
+      'claude-opus-4-6-20250801',
+      'claude-opus-4-6-latest',
+      'anthropic/claude-opus-4-6',
+      'claude-opus-4-6/anthropic',
+      'claude-opus-4-6-preview',
+    ];
+
+    modelVariations.forEach((model) => {
+      const valueKey = getValueKey(model);
+      expect(valueKey).toBe('claude-opus-4-6');
+      expect(getMultiplier({ model, tokenType: 'prompt' })).toBe(
+        tokenValues['claude-opus-4-6'].prompt,
+      );
+      expect(getMultiplier({ model, tokenType: 'completion' })).toBe(
+        tokenValues['claude-opus-4-6'].completion,
+      );
+    });
+  });
+
+  it('should return correct cache rates for Claude Opus 4.6', () => {
+    expect(getCacheMultiplier({ model: 'claude-opus-4-6', cacheType: 'write' })).toBe(
+      cacheTokenValues['claude-opus-4-6'].write,
+    );
+    expect(getCacheMultiplier({ model: 'claude-opus-4-6', cacheType: 'read' })).toBe(
+      cacheTokenValues['claude-opus-4-6'].read,
+    );
+  });
+
+  it('should handle Claude Opus 4.6 cache rates with model name variations', () => {
+    const modelVariations = [
+      'claude-opus-4-6',
+      'claude-opus-4-6-20250801',
+      'claude-opus-4-6-latest',
+      'anthropic/claude-opus-4-6',
+      'claude-opus-4-6/anthropic',
+      'claude-opus-4-6-preview',
+    ];
+
+    modelVariations.forEach((model) => {
+      expect(getCacheMultiplier({ model, cacheType: 'write' })).toBe(
+        cacheTokenValues['claude-opus-4-6'].write,
+      );
+      expect(getCacheMultiplier({ model, cacheType: 'read' })).toBe(
+        cacheTokenValues['claude-opus-4-6'].read,
+      );
+    });
+  });
+});
+
+describe('Premium Token Pricing', () => {
+  const premiumModel = 'claude-opus-4-6';
+  const premiumEntry = premiumTokenValues[premiumModel];
+  const { threshold } = premiumEntry;
+  const belowThreshold = threshold - 1;
+  const aboveThreshold = threshold + 1;
+  const wellAboveThreshold = threshold * 2;
+
+  it('should have premium pricing defined for claude-opus-4-6', () => {
+    expect(premiumEntry).toBeDefined();
+    expect(premiumEntry.threshold).toBeDefined();
+    expect(premiumEntry.prompt).toBeDefined();
+    expect(premiumEntry.completion).toBeDefined();
+    expect(premiumEntry.prompt).toBeGreaterThan(tokenValues[premiumModel].prompt);
+    expect(premiumEntry.completion).toBeGreaterThan(tokenValues[premiumModel].completion);
+  });
+
+  it('should return null from getPremiumRate when inputTokenCount is below threshold', () => {
+    expect(getPremiumRate(premiumModel, 'prompt', belowThreshold)).toBeNull();
+    expect(getPremiumRate(premiumModel, 'completion', belowThreshold)).toBeNull();
+    expect(getPremiumRate(premiumModel, 'prompt', threshold)).toBeNull();
+  });
+
+  it('should return premium rate from getPremiumRate when inputTokenCount exceeds threshold', () => {
+    expect(getPremiumRate(premiumModel, 'prompt', aboveThreshold)).toBe(premiumEntry.prompt);
+    expect(getPremiumRate(premiumModel, 'completion', aboveThreshold)).toBe(
+      premiumEntry.completion,
+    );
+    expect(getPremiumRate(premiumModel, 'prompt', wellAboveThreshold)).toBe(premiumEntry.prompt);
+  });
+
+  it('should return null from getPremiumRate when inputTokenCount is undefined or null', () => {
+    expect(getPremiumRate(premiumModel, 'prompt', undefined)).toBeNull();
+    expect(getPremiumRate(premiumModel, 'prompt', null)).toBeNull();
+  });
+
+  it('should return null from getPremiumRate for models without premium pricing', () => {
+    expect(getPremiumRate('claude-opus-4-5', 'prompt', wellAboveThreshold)).toBeNull();
+    expect(getPremiumRate('claude-sonnet-4', 'prompt', wellAboveThreshold)).toBeNull();
+    expect(getPremiumRate('gpt-4o', 'prompt', wellAboveThreshold)).toBeNull();
+  });
+
+  it('should return standard rate from getMultiplier when inputTokenCount is below threshold', () => {
+    expect(
+      getMultiplier({
+        model: premiumModel,
+        tokenType: 'prompt',
+        inputTokenCount: belowThreshold,
+      }),
+    ).toBe(tokenValues[premiumModel].prompt);
+    expect(
+      getMultiplier({
+        model: premiumModel,
+        tokenType: 'completion',
+        inputTokenCount: belowThreshold,
+      }),
+    ).toBe(tokenValues[premiumModel].completion);
+  });
+
+  it('should return premium rate from getMultiplier when inputTokenCount exceeds threshold', () => {
+    expect(
+      getMultiplier({
+        model: premiumModel,
+        tokenType: 'prompt',
+        inputTokenCount: aboveThreshold,
+      }),
+    ).toBe(premiumEntry.prompt);
+    expect(
+      getMultiplier({
+        model: premiumModel,
+        tokenType: 'completion',
+        inputTokenCount: aboveThreshold,
+      }),
+    ).toBe(premiumEntry.completion);
+  });
+
+  it('should return standard rate from getMultiplier when inputTokenCount is exactly at threshold', () => {
+    expect(
+      getMultiplier({ model: premiumModel, tokenType: 'prompt', inputTokenCount: threshold }),
+    ).toBe(tokenValues[premiumModel].prompt);
+  });
+
+  it('should return premium rate from getMultiplier when inputTokenCount is one above threshold', () => {
+    expect(
+      getMultiplier({ model: premiumModel, tokenType: 'prompt', inputTokenCount: aboveThreshold }),
+    ).toBe(premiumEntry.prompt);
+  });
+
+  it('should not apply premium pricing to models without premium entries', () => {
+    expect(
+      getMultiplier({
+        model: 'claude-opus-4-5',
+        tokenType: 'prompt',
+        inputTokenCount: wellAboveThreshold,
+      }),
+    ).toBe(tokenValues['claude-opus-4-5'].prompt);
+    expect(
+      getMultiplier({
+        model: 'claude-sonnet-4',
+        tokenType: 'prompt',
+        inputTokenCount: wellAboveThreshold,
+      }),
+    ).toBe(tokenValues['claude-sonnet-4'].prompt);
+  });
+
+  it('should use standard rate when inputTokenCount is not provided', () => {
+    expect(getMultiplier({ model: premiumModel, tokenType: 'prompt' })).toBe(
+      tokenValues[premiumModel].prompt,
+    );
+    expect(getMultiplier({ model: premiumModel, tokenType: 'completion' })).toBe(
+      tokenValues[premiumModel].completion,
+    );
+  });
+
+  it('should apply premium pricing through getMultiplier with valueKey path', () => {
+    const valueKey = getValueKey(premiumModel);
+    expect(getMultiplier({ valueKey, tokenType: 'prompt', inputTokenCount: aboveThreshold })).toBe(
+      premiumEntry.prompt,
+    );
+    expect(
+      getMultiplier({ valueKey, tokenType: 'completion', inputTokenCount: aboveThreshold }),
+    ).toBe(premiumEntry.completion);
+  });
+
+  it('should apply standard pricing through getMultiplier with valueKey path when below threshold', () => {
+    const valueKey = getValueKey(premiumModel);
+    expect(getMultiplier({ valueKey, tokenType: 'prompt', inputTokenCount: belowThreshold })).toBe(
+      tokenValues[premiumModel].prompt,
+    );
+    expect(
+      getMultiplier({ valueKey, tokenType: 'completion', inputTokenCount: belowThreshold }),
+    ).toBe(tokenValues[premiumModel].completion);
+  });
 });
 
 describe('tokens.ts and tx.js sync validation', () => {
diff --git a/api/package.json b/api/package.json
index 0881070652..bc212227d3 100644
--- a/api/package.json
+++ b/api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@librechat/backend",
-  "version": "v0.8.2-rc2",
+  "version": "v0.8.2",
   "description": "",
   "scripts": {
     "start": "echo 'please run this from the root directory'",
@@ -34,25 +34,24 @@
   },
   "homepage": "https://librechat.ai",
   "dependencies": {
-    "@anthropic-ai/sdk": "^0.71.0",
-    "@anthropic-ai/vertex-sdk": "^0.14.0",
-    "@aws-sdk/client-bedrock-runtime": "^3.941.0",
-    "@aws-sdk/client-s3": "^3.758.0",
+    "@anthropic-ai/vertex-sdk": "^0.14.3",
+    "@aws-sdk/client-bedrock-runtime": "^3.980.0",
+    "@aws-sdk/client-s3": "^3.980.0",
     "@aws-sdk/s3-request-presigner": "^3.758.0",
     "@azure/identity": "^4.7.0",
     "@azure/search-documents": "^12.0.0",
-    "@azure/storage-blob": "^12.27.0",
+    "@azure/storage-blob": "^12.30.0",
     "@google/genai": "^1.19.0",
     "@keyv/redis": "^4.3.3",
     "@langchain/core": "^0.3.80",
-    "@librechat/agents": "^3.0.77",
+    "@librechat/agents": "^3.1.50",
     "@librechat/api": "*",
     "@librechat/data-schemas": "*",
     "@microsoft/microsoft-graph-client": "^3.0.7",
-    "@modelcontextprotocol/sdk": "^1.25.2",
+    "@modelcontextprotocol/sdk": "^1.26.0",
     "@node-saml/passport-saml": "^5.1.0",
     "@smithy/node-http-handler": "^4.4.5",
-    "axios": "^1.12.1",
+    "axios": "^1.13.5",
     "bcryptjs": "^2.4.3",
     "compression": "^1.8.1",
     "connect-redis": "^8.1.0",
@@ -80,7 +79,7 @@
     "keyv-file": "^5.1.2",
     "klona": "^2.0.6",
     "librechat-data-provider": "*",
-    "lodash": "^4.17.21",
+    "lodash": "^4.17.23",
     "mathjs": "^15.1.0",
     "meilisearch": "^0.38.0",
     "memorystore": "^1.6.7",
@@ -108,7 +107,7 @@
     "tiktoken": "^1.0.15",
     "traverse": "^0.6.7",
     "ua-parser-js": "^1.0.36",
-    "undici": "^7.10.0",
+    "undici": "^7.18.2",
     "winston": "^3.11.0",
     "winston-daily-rotate-file": "^5.0.0",
     "zod": "^3.22.4"
diff --git a/api/server/controllers/AuthController.js b/api/server/controllers/AuthController.js
index 22e53dcfc9..588391b535 100644
--- a/api/server/controllers/AuthController.js
+++ b/api/server/controllers/AuthController.js
@@ -18,7 +18,6 @@ const {
   findUser,
 } = require('~/models');
 const { getGraphApiToken } = require('~/server/services/GraphTokenService');
-const { getOAuthReconnectionManager } = require('~/config');
 const { getOpenIdConfig } = require('~/strategies');
 
 const registrationController = async (req, res) => {
@@ -79,7 +78,12 @@ const refreshController = async (req, res) => {
 
     try {
       const openIdConfig = getOpenIdConfig();
-      const tokenset = await openIdClient.refreshTokenGrant(openIdConfig, refreshToken);
+      const refreshParams = process.env.OPENID_SCOPE ? { scope: process.env.OPENID_SCOPE } : {};
+      const tokenset = await openIdClient.refreshTokenGrant(
+        openIdConfig,
+        refreshToken,
+        refreshParams,
+      );
       const claims = tokenset.claims();
       const { user, error, migration } = await findOpenIDUser({
         findUser,
@@ -161,17 +165,6 @@ const refreshController = async (req, res) => {
     if (session && session.expiration > new Date()) {
       const token = await setAuthTokens(userId, res, session);
 
-      // trigger OAuth MCP server reconnection asynchronously (best effort)
-      try {
-        void getOAuthReconnectionManager()
-          .reconnectServers(userId)
-          .catch((err) => {
-            logger.error('[refreshController] Error reconnecting OAuth MCP servers:', err);
-          });
-      } catch (err) {
-        logger.warn(`[refreshController] Cannot attempt OAuth MCP servers reconnection:`, err);
-      }
-
       res.status(200).send({ token, user });
     } else if (req?.query?.retry) {
       // Retrying from a refresh token request that failed (401)
diff --git a/api/server/controllers/PermissionsController.js b/api/server/controllers/PermissionsController.js
index e22e9532c9..51993d083c 100644
--- a/api/server/controllers/PermissionsController.js
+++ b/api/server/controllers/PermissionsController.js
@@ -5,6 +5,7 @@
 const mongoose = require('mongoose');
 const { logger } = require('@librechat/data-schemas');
 const { ResourceType, PrincipalType, PermissionBits } = require('librechat-data-provider');
+const { enrichRemoteAgentPrincipals, backfillRemoteAgentPermissions } = require('@librechat/api');
 const {
   bulkUpdateResourcePermissions,
   ensureGroupPrincipalExists,
@@ -14,7 +15,6 @@ const {
   findAccessibleResources,
   getResourcePermissionsMap,
 } = require('~/server/services/PermissionService');
-const { AclEntry } = require('~/db/models');
 const {
   searchPrincipals: searchLocalPrincipals,
   sortPrincipalsByRelevance,
@@ -24,6 +24,7 @@ const {
   entraIdPrincipalFeatureEnabled,
   searchEntraIdPrincipals,
 } = require('~/server/services/GraphApiService');
+const { AclEntry, AccessRole } = require('~/db/models');
 
 /**
  * Generic controller for resource permission endpoints
@@ -234,7 +235,7 @@ const getResourcePermissions = async (req, res) => {
       },
     ]);
 
-    const principals = [];
+    let principals = [];
     let publicPermission = null;
 
     // Process aggregation results
@@ -280,6 +281,13 @@ const getResourcePermissions = async (req, res) => {
       }
     }
 
+    if (resourceType === ResourceType.REMOTE_AGENT) {
+      const enricherDeps = { AclEntry, AccessRole, logger };
+      const enrichResult = await enrichRemoteAgentPrincipals(enricherDeps, resourceId, principals);
+      principals = enrichResult.principals;
+      backfillRemoteAgentPermissions(enricherDeps, resourceId, enrichResult.entriesToBackfill);
+    }
+
     // Return response in format expected by frontend
     const response = {
       resourceType,
diff --git a/api/server/controllers/PluginController.js b/api/server/controllers/PluginController.js
index c5e074b8ff..279ffb15fd 100644
--- a/api/server/controllers/PluginController.js
+++ b/api/server/controllers/PluginController.js
@@ -8,7 +8,7 @@ const { getLogStores } = require('~/cache');
 
 const getAvailablePluginsController = async (req, res) => {
   try {
-    const cache = getLogStores(CacheKeys.CONFIG_STORE);
+    const cache = getLogStores(CacheKeys.TOOL_CACHE);
     const cachedPlugins = await cache.get(CacheKeys.PLUGINS);
     if (cachedPlugins) {
       res.status(200).json(cachedPlugins);
@@ -63,7 +63,7 @@ const getAvailableTools = async (req, res) => {
       logger.warn('[getAvailableTools] User ID not found in request');
       return res.status(401).json({ message: 'Unauthorized' });
     }
-    const cache = getLogStores(CacheKeys.CONFIG_STORE);
+    const cache = getLogStores(CacheKeys.TOOL_CACHE);
     const cachedToolsArray = await cache.get(CacheKeys.TOOLS);
 
     const appConfig = req.config ?? (await getAppConfig({ role: req.user?.role }));
diff --git a/api/server/controllers/PluginController.spec.js b/api/server/controllers/PluginController.spec.js
index d7d3f83a8b..06a51a3bd6 100644
--- a/api/server/controllers/PluginController.spec.js
+++ b/api/server/controllers/PluginController.spec.js
@@ -1,3 +1,4 @@
+const { CacheKeys } = require('librechat-data-provider');
 const { getCachedTools, getAppConfig } = require('~/server/services/Config');
 const { getLogStores } = require('~/cache');
 
@@ -63,6 +64,28 @@ describe('PluginController', () => {
     });
   });
 
+  describe('cache namespace', () => {
+    it('getAvailablePluginsController should use TOOL_CACHE namespace', async () => {
+      mockCache.get.mockResolvedValue([]);
+      await getAvailablePluginsController(mockReq, mockRes);
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+    });
+
+    it('getAvailableTools should use TOOL_CACHE namespace', async () => {
+      mockCache.get.mockResolvedValue([]);
+      await getAvailableTools(mockReq, mockRes);
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+    });
+
+    it('should NOT use CONFIG_STORE namespace for tool/plugin operations', async () => {
+      mockCache.get.mockResolvedValue([]);
+      await getAvailablePluginsController(mockReq, mockRes);
+      await getAvailableTools(mockReq, mockRes);
+      const allCalls = getLogStores.mock.calls.flat();
+      expect(allCalls).not.toContain(CacheKeys.CONFIG_STORE);
+    });
+  });
+
   describe('getAvailablePluginsController', () => {
     it('should use filterUniquePlugins to remove duplicate plugins', async () => {
       // Add plugins with duplicates to availableTools
diff --git a/api/server/controllers/UserController.js b/api/server/controllers/UserController.js
index b0cfd7ede2..7a9dd8125e 100644
--- a/api/server/controllers/UserController.js
+++ b/api/server/controllers/UserController.js
@@ -22,6 +22,7 @@ const {
 } = require('~/models');
 const {
   ConversationTag,
+  AgentApiKey,
   Transaction,
   MemoryEntry,
   Assistant,
@@ -35,6 +36,7 @@ const {
 const { updateUserPluginAuth, deleteUserPluginAuth } = require('~/server/services/PluginService');
 const { verifyEmail, resendVerificationEmail } = require('~/server/services/AuthService');
 const { getMCPManager, getFlowStateManager, getMCPServersRegistry } = require('~/config');
+const { invalidateCachedTools } = require('~/server/services/Config/getCachedTools');
 const { needsRefresh, getNewS3URL } = require('~/server/services/Files/S3/crud');
 const { processDeleteRequest } = require('~/server/services/Files/process');
 const { getAppConfig } = require('~/server/services/Config');
@@ -214,6 +216,7 @@ const updateUserPluginsController = async (req, res) => {
               `[updateUserPluginsController] Attempting disconnect of MCP server "${serverName}" for user ${user.id} after plugin auth update.`,
             );
             await mcpManager.disconnectUserConnection(user.id, serverName);
+            await invalidateCachedTools({ userId: user.id, serverName });
           }
         } catch (disconnectError) {
           logger.error(
@@ -256,6 +259,7 @@ const deleteUserController = async (req, res) => {
     await deleteFiles(null, user.id); // delete database files in case of orphaned files from previous steps
     await deleteToolCalls(user.id); // delete user tool calls
     await deleteUserAgents(user.id); // delete user agents
+    await AgentApiKey.deleteMany({ user: user._id }); // delete user agent API keys
     await Assistant.deleteMany({ user: user.id }); // delete user assistants
     await ConversationTag.deleteMany({ user: user.id }); // delete user conversation tags
     await MemoryEntry.deleteMany({ userId: user.id }); // delete user memory entries
diff --git a/api/server/controllers/agents/__tests__/callbacks.spec.js b/api/server/controllers/agents/__tests__/callbacks.spec.js
index 7922c31efa..8bd711f9c6 100644
--- a/api/server/controllers/agents/__tests__/callbacks.spec.js
+++ b/api/server/controllers/agents/__tests__/callbacks.spec.js
@@ -16,13 +16,10 @@ jest.mock('@librechat/data-schemas', () => ({
 }));
 
 jest.mock('@librechat/agents', () => ({
-  EnvVar: { CODE_API_KEY: 'CODE_API_KEY' },
-  Providers: { GOOGLE: 'google' },
-  GraphEvents: {},
+  ...jest.requireActual('@librechat/agents'),
   getMessageId: jest.fn(),
   ToolEndHandler: jest.fn(),
   handleToolCalls: jest.fn(),
-  ChatModelStreamHandler: jest.fn(),
 }));
 
 jest.mock('~/server/services/Files/Citations', () => ({
diff --git a/api/server/controllers/agents/__tests__/jobReplacement.spec.js b/api/server/controllers/agents/__tests__/jobReplacement.spec.js
new file mode 100644
index 0000000000..efa79ca4ba
--- /dev/null
+++ b/api/server/controllers/agents/__tests__/jobReplacement.spec.js
@@ -0,0 +1,281 @@
+/**
+ * Tests for job replacement detection in ResumableAgentController
+ *
+ * Tests the following fixes from PR #11462:
+ * 1. Job creation timestamp tracking
+ * 2. Stale job detection and event skipping
+ * 3. Response message saving before final event emission
+ */
+
+const mockLogger = {
+  debug: jest.fn(),
+  warn: jest.fn(),
+  error: jest.fn(),
+  info: jest.fn(),
+};
+
+const mockGenerationJobManager = {
+  createJob: jest.fn(),
+  getJob: jest.fn(),
+  emitDone: jest.fn(),
+  emitChunk: jest.fn(),
+  completeJob: jest.fn(),
+  updateMetadata: jest.fn(),
+  setContentParts: jest.fn(),
+  subscribe: jest.fn(),
+};
+
+const mockSaveMessage = jest.fn();
+const mockDecrementPendingRequest = jest.fn();
+
+jest.mock('@librechat/data-schemas', () => ({
+  logger: mockLogger,
+}));
+
+jest.mock('@librechat/api', () => ({
+  isEnabled: jest.fn().mockReturnValue(false),
+  GenerationJobManager: mockGenerationJobManager,
+  checkAndIncrementPendingRequest: jest.fn().mockResolvedValue({ allowed: true }),
+  decrementPendingRequest: (...args) => mockDecrementPendingRequest(...args),
+  getViolationInfo: jest.fn(),
+  sanitizeMessageForTransmit: jest.fn((msg) => msg),
+  sanitizeFileForTransmit: jest.fn((file) => file),
+  Constants: { NO_PARENT: '00000000-0000-0000-0000-000000000000' },
+}));
+
+jest.mock('~/models', () => ({
+  saveMessage: (...args) => mockSaveMessage(...args),
+}));
+
+describe('Job Replacement Detection', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('Job Creation Timestamp Tracking', () => {
+    it('should capture createdAt when job is created', async () => {
+      const streamId = 'test-stream-123';
+      const createdAt = Date.now();
+
+      mockGenerationJobManager.createJob.mockResolvedValue({
+        createdAt,
+        readyPromise: Promise.resolve(),
+        abortController: new AbortController(),
+        emitter: { on: jest.fn() },
+      });
+
+      const job = await mockGenerationJobManager.createJob(streamId, 'user-123', streamId);
+
+      expect(job.createdAt).toBe(createdAt);
+    });
+  });
+
+  describe('Job Replacement Detection Logic', () => {
+    /**
+     * Simulates the job replacement detection logic from request.js
+     * This is extracted for unit testing since the full controller is complex
+     */
+    const detectJobReplacement = async (streamId, originalCreatedAt) => {
+      const currentJob = await mockGenerationJobManager.getJob(streamId);
+      return !currentJob || currentJob.createdAt !== originalCreatedAt;
+    };
+
+    it('should detect when job was replaced (different createdAt)', async () => {
+      const streamId = 'test-stream-123';
+      const originalCreatedAt = 1000;
+      const newCreatedAt = 2000;
+
+      mockGenerationJobManager.getJob.mockResolvedValue({
+        createdAt: newCreatedAt,
+      });
+
+      const wasReplaced = await detectJobReplacement(streamId, originalCreatedAt);
+
+      expect(wasReplaced).toBe(true);
+    });
+
+    it('should detect when job was deleted', async () => {
+      const streamId = 'test-stream-123';
+      const originalCreatedAt = 1000;
+
+      mockGenerationJobManager.getJob.mockResolvedValue(null);
+
+      const wasReplaced = await detectJobReplacement(streamId, originalCreatedAt);
+
+      expect(wasReplaced).toBe(true);
+    });
+
+    it('should not detect replacement when same job (same createdAt)', async () => {
+      const streamId = 'test-stream-123';
+      const originalCreatedAt = 1000;
+
+      mockGenerationJobManager.getJob.mockResolvedValue({
+        createdAt: originalCreatedAt,
+      });
+
+      const wasReplaced = await detectJobReplacement(streamId, originalCreatedAt);
+
+      expect(wasReplaced).toBe(false);
+    });
+  });
+
+  describe('Event Emission Behavior', () => {
+    /**
+     * Simulates the final event emission logic from request.js
+     */
+    const emitFinalEventIfNotReplaced = async ({
+      streamId,
+      originalCreatedAt,
+      finalEvent,
+      userId,
+    }) => {
+      const currentJob = await mockGenerationJobManager.getJob(streamId);
+      const jobWasReplaced = !currentJob || currentJob.createdAt !== originalCreatedAt;
+
+      if (jobWasReplaced) {
+        mockLogger.debug('Skipping FINAL emit - job was replaced', {
+          streamId,
+          originalCreatedAt,
+          currentCreatedAt: currentJob?.createdAt,
+        });
+        await mockDecrementPendingRequest(userId);
+        return false;
+      }
+
+      mockGenerationJobManager.emitDone(streamId, finalEvent);
+      mockGenerationJobManager.completeJob(streamId);
+      await mockDecrementPendingRequest(userId);
+      return true;
+    };
+
+    it('should skip emitting when job was replaced', async () => {
+      const streamId = 'test-stream-123';
+      const originalCreatedAt = 1000;
+      const newCreatedAt = 2000;
+      const userId = 'user-123';
+
+      mockGenerationJobManager.getJob.mockResolvedValue({
+        createdAt: newCreatedAt,
+      });
+
+      const emitted = await emitFinalEventIfNotReplaced({
+        streamId,
+        originalCreatedAt,
+        finalEvent: { final: true },
+        userId,
+      });
+
+      expect(emitted).toBe(false);
+      expect(mockGenerationJobManager.emitDone).not.toHaveBeenCalled();
+      expect(mockGenerationJobManager.completeJob).not.toHaveBeenCalled();
+      expect(mockDecrementPendingRequest).toHaveBeenCalledWith(userId);
+      expect(mockLogger.debug).toHaveBeenCalledWith(
+        'Skipping FINAL emit - job was replaced',
+        expect.objectContaining({
+          streamId,
+          originalCreatedAt,
+          currentCreatedAt: newCreatedAt,
+        }),
+      );
+    });
+
+    it('should emit when job was not replaced', async () => {
+      const streamId = 'test-stream-123';
+      const originalCreatedAt = 1000;
+      const userId = 'user-123';
+      const finalEvent = { final: true, conversation: { conversationId: streamId } };
+
+      mockGenerationJobManager.getJob.mockResolvedValue({
+        createdAt: originalCreatedAt,
+      });
+
+      const emitted = await emitFinalEventIfNotReplaced({
+        streamId,
+        originalCreatedAt,
+        finalEvent,
+        userId,
+      });
+
+      expect(emitted).toBe(true);
+      expect(mockGenerationJobManager.emitDone).toHaveBeenCalledWith(streamId, finalEvent);
+      expect(mockGenerationJobManager.completeJob).toHaveBeenCalledWith(streamId);
+      expect(mockDecrementPendingRequest).toHaveBeenCalledWith(userId);
+    });
+  });
+
+  describe('Response Message Saving Order', () => {
+    /**
+     * Tests that response messages are saved BEFORE final events are emitted
+     * This prevents race conditions where clients send follow-up messages
+     * before the response is in the database
+     */
+    it('should save message before emitting final event', async () => {
+      const callOrder = [];
+
+      mockSaveMessage.mockImplementation(async () => {
+        callOrder.push('saveMessage');
+      });
+
+      mockGenerationJobManager.emitDone.mockImplementation(() => {
+        callOrder.push('emitDone');
+      });
+
+      mockGenerationJobManager.getJob.mockResolvedValue({
+        createdAt: 1000,
+      });
+
+      // Simulate the order of operations from request.js
+      const streamId = 'test-stream-123';
+      const originalCreatedAt = 1000;
+      const response = { messageId: 'response-123' };
+      const userId = 'user-123';
+
+      // Step 1: Save message
+      await mockSaveMessage({}, { ...response, user: userId }, { context: 'test' });
+
+      // Step 2: Check for replacement
+      const currentJob = await mockGenerationJobManager.getJob(streamId);
+      const jobWasReplaced = !currentJob || currentJob.createdAt !== originalCreatedAt;
+
+      // Step 3: Emit if not replaced
+      if (!jobWasReplaced) {
+        mockGenerationJobManager.emitDone(streamId, { final: true });
+      }
+
+      expect(callOrder).toEqual(['saveMessage', 'emitDone']);
+    });
+  });
+
+  describe('Aborted Request Handling', () => {
+    it('should use unfinished: true instead of error: true for aborted requests', () => {
+      const response = { messageId: 'response-123', content: [] };
+
+      // The new format for aborted responses
+      const abortedResponse = { ...response, unfinished: true };
+
+      expect(abortedResponse.unfinished).toBe(true);
+      expect(abortedResponse.error).toBeUndefined();
+    });
+
+    it('should include unfinished flag in final event for aborted requests', () => {
+      const response = { messageId: 'response-123', content: [] };
+
+      // Old format (deprecated)
+      const _oldFinalEvent = {
+        final: true,
+        responseMessage: { ...response, error: true },
+        error: { message: 'Request was aborted' },
+      };
+
+      // New format (PR #11462)
+      const newFinalEvent = {
+        final: true,
+        responseMessage: { ...response, unfinished: true },
+      };
+
+      expect(newFinalEvent.responseMessage.unfinished).toBe(true);
+      expect(newFinalEvent.error).toBeUndefined();
+      expect(newFinalEvent.responseMessage.error).toBeUndefined();
+    });
+  });
+});
diff --git a/api/server/controllers/agents/__tests__/openai.spec.js b/api/server/controllers/agents/__tests__/openai.spec.js
new file mode 100644
index 0000000000..8592c79a2d
--- /dev/null
+++ b/api/server/controllers/agents/__tests__/openai.spec.js
@@ -0,0 +1,204 @@
+/**
+ * Unit tests for OpenAI-compatible API controller
+ * Tests that recordCollectedUsage is called correctly for token spending
+ */
+
+const mockSpendTokens = jest.fn().mockResolvedValue({});
+const mockSpendStructuredTokens = jest.fn().mockResolvedValue({});
+const mockRecordCollectedUsage = jest
+  .fn()
+  .mockResolvedValue({ input_tokens: 100, output_tokens: 50 });
+const mockGetBalanceConfig = jest.fn().mockReturnValue({ enabled: true });
+const mockGetTransactionsConfig = jest.fn().mockReturnValue({ enabled: true });
+
+jest.mock('nanoid', () => ({
+  nanoid: jest.fn(() => 'mock-nanoid-123'),
+}));
+
+jest.mock('@librechat/data-schemas', () => ({
+  logger: {
+    debug: jest.fn(),
+    error: jest.fn(),
+    warn: jest.fn(),
+  },
+}));
+
+jest.mock('@librechat/agents', () => ({
+  Callback: { TOOL_ERROR: 'TOOL_ERROR' },
+  ToolEndHandler: jest.fn(),
+  formatAgentMessages: jest.fn().mockReturnValue({
+    messages: [],
+    indexTokenCountMap: {},
+  }),
+}));
+
+jest.mock('@librechat/api', () => ({
+  writeSSE: jest.fn(),
+  createRun: jest.fn().mockResolvedValue({
+    processStream: jest.fn().mockResolvedValue(undefined),
+  }),
+  createChunk: jest.fn().mockReturnValue({}),
+  buildToolSet: jest.fn().mockReturnValue(new Set()),
+  sendFinalChunk: jest.fn(),
+  createSafeUser: jest.fn().mockReturnValue({ id: 'user-123' }),
+  validateRequest: jest
+    .fn()
+    .mockReturnValue({ request: { model: 'agent-123', messages: [], stream: false } }),
+  initializeAgent: jest.fn().mockResolvedValue({
+    model: 'gpt-4',
+    model_parameters: {},
+    toolRegistry: {},
+  }),
+  getBalanceConfig: mockGetBalanceConfig,
+  createErrorResponse: jest.fn(),
+  getTransactionsConfig: mockGetTransactionsConfig,
+  recordCollectedUsage: mockRecordCollectedUsage,
+  buildNonStreamingResponse: jest.fn().mockReturnValue({ id: 'resp-123' }),
+  createOpenAIStreamTracker: jest.fn().mockReturnValue({
+    addText: jest.fn(),
+    addReasoning: jest.fn(),
+    toolCalls: new Map(),
+    usage: { promptTokens: 0, completionTokens: 0, reasoningTokens: 0 },
+  }),
+  createOpenAIContentAggregator: jest.fn().mockReturnValue({
+    addText: jest.fn(),
+    addReasoning: jest.fn(),
+    getText: jest.fn().mockReturnValue(''),
+    getReasoning: jest.fn().mockReturnValue(''),
+    toolCalls: new Map(),
+    usage: { promptTokens: 100, completionTokens: 50, reasoningTokens: 0 },
+  }),
+  createToolExecuteHandler: jest.fn().mockReturnValue({ handle: jest.fn() }),
+  isChatCompletionValidationFailure: jest.fn().mockReturnValue(false),
+}));
+
+jest.mock('~/server/services/ToolService', () => ({
+  loadAgentTools: jest.fn().mockResolvedValue([]),
+  loadToolsForExecution: jest.fn().mockResolvedValue([]),
+}));
+
+jest.mock('~/models/spendTokens', () => ({
+  spendTokens: mockSpendTokens,
+  spendStructuredTokens: mockSpendStructuredTokens,
+}));
+
+jest.mock('~/server/controllers/agents/callbacks', () => ({
+  createToolEndCallback: jest.fn().mockReturnValue(jest.fn()),
+}));
+
+jest.mock('~/server/services/PermissionService', () => ({
+  findAccessibleResources: jest.fn().mockResolvedValue([]),
+}));
+
+jest.mock('~/models/Conversation', () => ({
+  getConvoFiles: jest.fn().mockResolvedValue([]),
+}));
+
+jest.mock('~/models/Agent', () => ({
+  getAgent: jest.fn().mockResolvedValue({
+    id: 'agent-123',
+    provider: 'openAI',
+    model_parameters: { model: 'gpt-4' },
+  }),
+  getAgents: jest.fn().mockResolvedValue([]),
+}));
+
+jest.mock('~/models', () => ({
+  getFiles: jest.fn(),
+  getUserKey: jest.fn(),
+  getMessages: jest.fn(),
+  updateFilesUsage: jest.fn(),
+  getUserKeyValues: jest.fn(),
+  getUserCodeFiles: jest.fn(),
+  getToolFilesByIds: jest.fn(),
+  getCodeGeneratedFiles: jest.fn(),
+}));
+
+describe('OpenAIChatCompletionController', () => {
+  let OpenAIChatCompletionController;
+  let req, res;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+
+    const controller = require('../openai');
+    OpenAIChatCompletionController = controller.OpenAIChatCompletionController;
+
+    req = {
+      body: {
+        model: 'agent-123',
+        messages: [{ role: 'user', content: 'Hello' }],
+        stream: false,
+      },
+      user: { id: 'user-123' },
+      config: {
+        endpoints: {
+          agents: { allowedProviders: ['openAI'] },
+        },
+      },
+      on: jest.fn(),
+    };
+
+    res = {
+      status: jest.fn().mockReturnThis(),
+      json: jest.fn(),
+      setHeader: jest.fn(),
+      flushHeaders: jest.fn(),
+      end: jest.fn(),
+      write: jest.fn(),
+    };
+  });
+
+  describe('token usage recording', () => {
+    it('should call recordCollectedUsage after successful non-streaming completion', async () => {
+      await OpenAIChatCompletionController(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledTimes(1);
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        { spendTokens: mockSpendTokens, spendStructuredTokens: mockSpendStructuredTokens },
+        expect.objectContaining({
+          user: 'user-123',
+          conversationId: expect.any(String),
+          collectedUsage: expect.any(Array),
+          context: 'message',
+          balance: { enabled: true },
+          transactions: { enabled: true },
+        }),
+      );
+    });
+
+    it('should pass balance and transactions config to recordCollectedUsage', async () => {
+      mockGetBalanceConfig.mockReturnValue({ enabled: true, startBalance: 1000 });
+      mockGetTransactionsConfig.mockReturnValue({ enabled: true, rateLimit: 100 });
+
+      await OpenAIChatCompletionController(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        expect.any(Object),
+        expect.objectContaining({
+          balance: { enabled: true, startBalance: 1000 },
+          transactions: { enabled: true, rateLimit: 100 },
+        }),
+      );
+    });
+
+    it('should pass spendTokens and spendStructuredTokens as dependencies', async () => {
+      await OpenAIChatCompletionController(req, res);
+
+      const [deps] = mockRecordCollectedUsage.mock.calls[0];
+      expect(deps).toHaveProperty('spendTokens', mockSpendTokens);
+      expect(deps).toHaveProperty('spendStructuredTokens', mockSpendStructuredTokens);
+    });
+
+    it('should include model from primaryConfig in recordCollectedUsage params', async () => {
+      await OpenAIChatCompletionController(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        expect.any(Object),
+        expect.objectContaining({
+          model: 'gpt-4',
+        }),
+      );
+    });
+  });
+});
diff --git a/api/server/controllers/agents/__tests__/responses.unit.spec.js b/api/server/controllers/agents/__tests__/responses.unit.spec.js
new file mode 100644
index 0000000000..e16ca394b2
--- /dev/null
+++ b/api/server/controllers/agents/__tests__/responses.unit.spec.js
@@ -0,0 +1,312 @@
+/**
+ * Unit tests for Open Responses API controller
+ * Tests that recordCollectedUsage is called correctly for token spending
+ */
+
+const mockSpendTokens = jest.fn().mockResolvedValue({});
+const mockSpendStructuredTokens = jest.fn().mockResolvedValue({});
+const mockRecordCollectedUsage = jest
+  .fn()
+  .mockResolvedValue({ input_tokens: 100, output_tokens: 50 });
+const mockGetBalanceConfig = jest.fn().mockReturnValue({ enabled: true });
+const mockGetTransactionsConfig = jest.fn().mockReturnValue({ enabled: true });
+
+jest.mock('nanoid', () => ({
+  nanoid: jest.fn(() => 'mock-nanoid-123'),
+}));
+
+jest.mock('uuid', () => ({
+  v4: jest.fn(() => 'mock-uuid-456'),
+}));
+
+jest.mock('@librechat/data-schemas', () => ({
+  logger: {
+    debug: jest.fn(),
+    error: jest.fn(),
+    warn: jest.fn(),
+  },
+}));
+
+jest.mock('@librechat/agents', () => ({
+  Callback: { TOOL_ERROR: 'TOOL_ERROR' },
+  ToolEndHandler: jest.fn(),
+  formatAgentMessages: jest.fn().mockReturnValue({
+    messages: [],
+    indexTokenCountMap: {},
+  }),
+}));
+
+jest.mock('@librechat/api', () => ({
+  createRun: jest.fn().mockResolvedValue({
+    processStream: jest.fn().mockResolvedValue(undefined),
+  }),
+  buildToolSet: jest.fn().mockReturnValue(new Set()),
+  createSafeUser: jest.fn().mockReturnValue({ id: 'user-123' }),
+  initializeAgent: jest.fn().mockResolvedValue({
+    model: 'claude-3',
+    model_parameters: {},
+    toolRegistry: {},
+  }),
+  getBalanceConfig: mockGetBalanceConfig,
+  getTransactionsConfig: mockGetTransactionsConfig,
+  recordCollectedUsage: mockRecordCollectedUsage,
+  createToolExecuteHandler: jest.fn().mockReturnValue({ handle: jest.fn() }),
+  // Responses API
+  writeDone: jest.fn(),
+  buildResponse: jest.fn().mockReturnValue({ id: 'resp_123', output: [] }),
+  generateResponseId: jest.fn().mockReturnValue('resp_mock-123'),
+  isValidationFailure: jest.fn().mockReturnValue(false),
+  emitResponseCreated: jest.fn(),
+  createResponseContext: jest.fn().mockReturnValue({ responseId: 'resp_123' }),
+  createResponseTracker: jest.fn().mockReturnValue({
+    usage: { promptTokens: 100, completionTokens: 50 },
+  }),
+  setupStreamingResponse: jest.fn(),
+  emitResponseInProgress: jest.fn(),
+  convertInputToMessages: jest.fn().mockReturnValue([]),
+  validateResponseRequest: jest.fn().mockReturnValue({
+    request: { model: 'agent-123', input: 'Hello', stream: false },
+  }),
+  buildAggregatedResponse: jest.fn().mockReturnValue({
+    id: 'resp_123',
+    status: 'completed',
+    output: [],
+    usage: { input_tokens: 100, output_tokens: 50, total_tokens: 150 },
+  }),
+  createResponseAggregator: jest.fn().mockReturnValue({
+    usage: { promptTokens: 100, completionTokens: 50 },
+  }),
+  sendResponsesErrorResponse: jest.fn(),
+  createResponsesEventHandlers: jest.fn().mockReturnValue({
+    handlers: {
+      on_message_delta: { handle: jest.fn() },
+      on_reasoning_delta: { handle: jest.fn() },
+      on_run_step: { handle: jest.fn() },
+      on_run_step_delta: { handle: jest.fn() },
+      on_chat_model_end: { handle: jest.fn() },
+    },
+    finalizeStream: jest.fn(),
+  }),
+  createAggregatorEventHandlers: jest.fn().mockReturnValue({
+    on_message_delta: { handle: jest.fn() },
+    on_reasoning_delta: { handle: jest.fn() },
+    on_run_step: { handle: jest.fn() },
+    on_run_step_delta: { handle: jest.fn() },
+    on_chat_model_end: { handle: jest.fn() },
+  }),
+}));
+
+jest.mock('~/server/services/ToolService', () => ({
+  loadAgentTools: jest.fn().mockResolvedValue([]),
+  loadToolsForExecution: jest.fn().mockResolvedValue([]),
+}));
+
+jest.mock('~/models/spendTokens', () => ({
+  spendTokens: mockSpendTokens,
+  spendStructuredTokens: mockSpendStructuredTokens,
+}));
+
+jest.mock('~/server/controllers/agents/callbacks', () => ({
+  createToolEndCallback: jest.fn().mockReturnValue(jest.fn()),
+  createResponsesToolEndCallback: jest.fn().mockReturnValue(jest.fn()),
+}));
+
+jest.mock('~/server/services/PermissionService', () => ({
+  findAccessibleResources: jest.fn().mockResolvedValue([]),
+}));
+
+jest.mock('~/models/Conversation', () => ({
+  getConvoFiles: jest.fn().mockResolvedValue([]),
+  saveConvo: jest.fn().mockResolvedValue({}),
+  getConvo: jest.fn().mockResolvedValue(null),
+}));
+
+jest.mock('~/models/Agent', () => ({
+  getAgent: jest.fn().mockResolvedValue({
+    id: 'agent-123',
+    name: 'Test Agent',
+    provider: 'anthropic',
+    model_parameters: { model: 'claude-3' },
+  }),
+  getAgents: jest.fn().mockResolvedValue([]),
+}));
+
+jest.mock('~/models', () => ({
+  getFiles: jest.fn(),
+  getUserKey: jest.fn(),
+  getMessages: jest.fn().mockResolvedValue([]),
+  saveMessage: jest.fn().mockResolvedValue({}),
+  updateFilesUsage: jest.fn(),
+  getUserKeyValues: jest.fn(),
+  getUserCodeFiles: jest.fn(),
+  getToolFilesByIds: jest.fn(),
+  getCodeGeneratedFiles: jest.fn(),
+}));
+
+describe('createResponse controller', () => {
+  let createResponse;
+  let req, res;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+
+    const controller = require('../responses');
+    createResponse = controller.createResponse;
+
+    req = {
+      body: {
+        model: 'agent-123',
+        input: 'Hello',
+        stream: false,
+      },
+      user: { id: 'user-123' },
+      config: {
+        endpoints: {
+          agents: { allowedProviders: ['anthropic'] },
+        },
+      },
+      on: jest.fn(),
+    };
+
+    res = {
+      status: jest.fn().mockReturnThis(),
+      json: jest.fn(),
+      setHeader: jest.fn(),
+      flushHeaders: jest.fn(),
+      end: jest.fn(),
+      write: jest.fn(),
+    };
+  });
+
+  describe('token usage recording - non-streaming', () => {
+    it('should call recordCollectedUsage after successful non-streaming completion', async () => {
+      await createResponse(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledTimes(1);
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        { spendTokens: mockSpendTokens, spendStructuredTokens: mockSpendStructuredTokens },
+        expect.objectContaining({
+          user: 'user-123',
+          conversationId: expect.any(String),
+          collectedUsage: expect.any(Array),
+          context: 'message',
+        }),
+      );
+    });
+
+    it('should pass balance and transactions config to recordCollectedUsage', async () => {
+      mockGetBalanceConfig.mockReturnValue({ enabled: true, startBalance: 2000 });
+      mockGetTransactionsConfig.mockReturnValue({ enabled: true });
+
+      await createResponse(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        expect.any(Object),
+        expect.objectContaining({
+          balance: { enabled: true, startBalance: 2000 },
+          transactions: { enabled: true },
+        }),
+      );
+    });
+
+    it('should pass spendTokens and spendStructuredTokens as dependencies', async () => {
+      await createResponse(req, res);
+
+      const [deps] = mockRecordCollectedUsage.mock.calls[0];
+      expect(deps).toHaveProperty('spendTokens', mockSpendTokens);
+      expect(deps).toHaveProperty('spendStructuredTokens', mockSpendStructuredTokens);
+    });
+
+    it('should include model from primaryConfig in recordCollectedUsage params', async () => {
+      await createResponse(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        expect.any(Object),
+        expect.objectContaining({
+          model: 'claude-3',
+        }),
+      );
+    });
+  });
+
+  describe('token usage recording - streaming', () => {
+    beforeEach(() => {
+      req.body.stream = true;
+
+      const api = require('@librechat/api');
+      api.validateResponseRequest.mockReturnValue({
+        request: { model: 'agent-123', input: 'Hello', stream: true },
+      });
+    });
+
+    it('should call recordCollectedUsage after successful streaming completion', async () => {
+      await createResponse(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledTimes(1);
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        { spendTokens: mockSpendTokens, spendStructuredTokens: mockSpendStructuredTokens },
+        expect.objectContaining({
+          user: 'user-123',
+          context: 'message',
+        }),
+      );
+    });
+  });
+
+  describe('collectedUsage population', () => {
+    it('should collect usage from on_chat_model_end events', async () => {
+      const api = require('@librechat/api');
+
+      let capturedOnChatModelEnd;
+      api.createAggregatorEventHandlers.mockImplementation(() => {
+        return {
+          on_message_delta: { handle: jest.fn() },
+          on_reasoning_delta: { handle: jest.fn() },
+          on_run_step: { handle: jest.fn() },
+          on_run_step_delta: { handle: jest.fn() },
+          on_chat_model_end: {
+            handle: jest.fn((event, data) => {
+              if (capturedOnChatModelEnd) {
+                capturedOnChatModelEnd(event, data);
+              }
+            }),
+          },
+        };
+      });
+
+      api.createRun.mockImplementation(async ({ customHandlers }) => {
+        capturedOnChatModelEnd = (event, data) => {
+          customHandlers.on_chat_model_end.handle(event, data);
+        };
+
+        return {
+          processStream: jest.fn().mockImplementation(async () => {
+            customHandlers.on_chat_model_end.handle('on_chat_model_end', {
+              output: {
+                usage_metadata: {
+                  input_tokens: 150,
+                  output_tokens: 75,
+                  model: 'claude-3',
+                },
+              },
+            });
+          }),
+        };
+      });
+
+      await createResponse(req, res);
+
+      expect(mockRecordCollectedUsage).toHaveBeenCalledWith(
+        expect.any(Object),
+        expect.objectContaining({
+          collectedUsage: expect.arrayContaining([
+            expect.objectContaining({
+              input_tokens: 150,
+              output_tokens: 75,
+            }),
+          ]),
+        }),
+      );
+    });
+  });
+});
diff --git a/api/server/controllers/agents/callbacks.js b/api/server/controllers/agents/callbacks.js
index 0d2a7bc317..0bb935795d 100644
--- a/api/server/controllers/agents/callbacks.js
+++ b/api/server/controllers/agents/callbacks.js
@@ -1,16 +1,13 @@
 const { nanoid } = require('nanoid');
-const { sendEvent, GenerationJobManager } = require('@librechat/api');
 const { logger } = require('@librechat/data-schemas');
+const { Constants, EnvVar, GraphEvents, ToolEndHandler } = require('@librechat/agents');
 const { Tools, StepTypes, FileContext, ErrorTypes } = require('librechat-data-provider');
 const {
-  EnvVar,
-  Providers,
-  GraphEvents,
-  getMessageId,
-  ToolEndHandler,
-  handleToolCalls,
-  ChatModelStreamHandler,
-} = require('@librechat/agents');
+  sendEvent,
+  GenerationJobManager,
+  writeAttachmentEvent,
+  createToolExecuteHandler,
+} = require('@librechat/api');
 const { processFileCitations } = require('~/server/services/Files/Citations');
 const { processCodeOutput } = require('~/server/services/Files/Code/process');
 const { loadAuthValues } = require('~/server/services/Tools/credentials');
@@ -51,8 +48,6 @@ class ModelEndHandler {
     let errorMessage;
     try {
       const agentContext = graph.getAgentContext(metadata);
-      const isGoogle = agentContext.provider === Providers.GOOGLE;
-      const streamingDisabled = !!agentContext.clientOptions?.disableStreaming;
       if (data?.output?.additional_kwargs?.stop_reason === 'refusal') {
         const info = { ...data.output.additional_kwargs };
         errorMessage = JSON.stringify({
@@ -67,21 +62,6 @@ class ModelEndHandler {
         });
       }
 
-      const toolCalls = data?.output?.tool_calls;
-      let hasUnprocessedToolCalls = false;
-      if (Array.isArray(toolCalls) && toolCalls.length > 0 && graph?.toolCallStepIds?.has) {
-        try {
-          hasUnprocessedToolCalls = toolCalls.some(
-            (tc) => tc?.id && !graph.toolCallStepIds.has(tc.id),
-          );
-        } catch {
-          hasUnprocessedToolCalls = false;
-        }
-      }
-      if (isGoogle || streamingDisabled || hasUnprocessedToolCalls) {
-        await handleToolCalls(toolCalls, metadata, graph);
-      }
-
       const usage = data?.output?.usage_metadata;
       if (!usage) {
         return this.finalize(errorMessage);
@@ -92,38 +72,6 @@ class ModelEndHandler {
       }
 
       this.collectedUsage.push(usage);
-      if (!streamingDisabled) {
-        return this.finalize(errorMessage);
-      }
-      if (!data.output.content) {
-        return this.finalize(errorMessage);
-      }
-      const stepKey = graph.getStepKey(metadata);
-      const message_id = getMessageId(stepKey, graph) ?? '';
-      if (message_id) {
-        await graph.dispatchRunStep(stepKey, {
-          type: StepTypes.MESSAGE_CREATION,
-          message_creation: {
-            message_id,
-          },
-        });
-      }
-      const stepId = graph.getStepIdByKey(stepKey);
-      const content = data.output.content;
-      if (typeof content === 'string') {
-        await graph.dispatchMessageDelta(stepId, {
-          content: [
-            {
-              type: 'text',
-              text: content,
-            },
-          ],
-        });
-      } else if (content.every((c) => c.type?.startsWith('text'))) {
-        await graph.dispatchMessageDelta(stepId, {
-          content,
-        });
-      }
     } catch (error) {
       logger.error('Error handling model end event:', error);
       return this.finalize(errorMessage);
@@ -146,18 +94,26 @@ function checkIfLastAgent(last_agent_id, langgraph_node) {
 
 /**
  * Helper to emit events either to res (standard mode) or to job emitter (resumable mode).
+ * In Redis mode, awaits the emit to guarantee event ordering (critical for streaming deltas).
  * @param {ServerResponse} res - The server response object
  * @param {string | null} streamId - The stream ID for resumable mode, or null for standard mode
  * @param {Object} eventData - The event data to send
+ * @returns {Promise<void>}
  */
-function emitEvent(res, streamId, eventData) {
+async function emitEvent(res, streamId, eventData) {
   if (streamId) {
-    GenerationJobManager.emitChunk(streamId, eventData);
+    await GenerationJobManager.emitChunk(streamId, eventData);
   } else {
     sendEvent(res, eventData);
   }
 }
 
+/**
+ * @typedef {Object} ToolExecuteOptions
+ * @property {(toolNames: string[]) => Promise<{loadedTools: StructuredTool[]}>} loadTools - Function to load tools by name
+ * @property {Object} configurable - Configurable context for tool invocation
+ */
+
 /**
  * Get default handlers for stream events.
  * @param {Object} options - The options object.
@@ -166,6 +122,7 @@ function emitEvent(res, streamId, eventData) {
  * @param {ToolEndCallback} options.toolEndCallback - Callback to use when tool ends.
  * @param {Array<UsageMetadata>} options.collectedUsage - The list of collected usage metadata.
  * @param {string | null} [options.streamId] - The stream ID for resumable mode, or null for standard mode.
+ * @param {ToolExecuteOptions} [options.toolExecuteOptions] - Options for event-driven tool execution.
  * @returns {Record<string, t.EventHandler>} The default handlers.
  * @throws {Error} If the request is not found.
  */
@@ -175,6 +132,7 @@ function getDefaultHandlers({
   toolEndCallback,
   collectedUsage,
   streamId = null,
+  toolExecuteOptions = null,
 }) {
   if (!res || !aggregateContent) {
     throw new Error(
@@ -184,7 +142,6 @@ function getDefaultHandlers({
   const handlers = {
     [GraphEvents.CHAT_MODEL_END]: new ModelEndHandler(collectedUsage),
     [GraphEvents.TOOL_END]: new ToolEndHandler(toolEndCallback, logger),
-    [GraphEvents.CHAT_MODEL_STREAM]: new ChatModelStreamHandler(),
     [GraphEvents.ON_RUN_STEP]: {
       /**
        * Handle ON_RUN_STEP event.
@@ -192,18 +149,19 @@ function getDefaultHandlers({
        * @param {StreamEventData} data - The event data.
        * @param {GraphRunnableConfig['configurable']} [metadata] The runnable metadata.
        */
-      handle: (event, data, metadata) => {
+      handle: async (event, data, metadata) => {
+        aggregateContent({ event, data });
         if (data?.stepDetails.type === StepTypes.TOOL_CALLS) {
-          emitEvent(res, streamId, { event, data });
+          await emitEvent(res, streamId, { event, data });
         } else if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
-          emitEvent(res, streamId, { event, data });
+          await emitEvent(res, streamId, { event, data });
         } else if (!metadata?.hide_sequential_outputs) {
-          emitEvent(res, streamId, { event, data });
+          await emitEvent(res, streamId, { event, data });
         } else {
           const agentName = metadata?.name ?? 'Agent';
           const isToolCall = data?.stepDetails.type === StepTypes.TOOL_CALLS;
           const action = isToolCall ? 'performing a task...' : 'thinking...';
-          emitEvent(res, streamId, {
+          await emitEvent(res, streamId, {
             event: 'on_agent_update',
             data: {
               runId: metadata?.run_id,
@@ -211,7 +169,6 @@ function getDefaultHandlers({
             },
           });
         }
-        aggregateContent({ event, data });
       },
     },
     [GraphEvents.ON_RUN_STEP_DELTA]: {
@@ -221,15 +178,15 @@ function getDefaultHandlers({
        * @param {StreamEventData} data - The event data.
        * @param {GraphRunnableConfig['configurable']} [metadata] The runnable metadata.
        */
-      handle: (event, data, metadata) => {
-        if (data?.delta.type === StepTypes.TOOL_CALLS) {
-          emitEvent(res, streamId, { event, data });
-        } else if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
-          emitEvent(res, streamId, { event, data });
-        } else if (!metadata?.hide_sequential_outputs) {
-          emitEvent(res, streamId, { event, data });
-        }
+      handle: async (event, data, metadata) => {
         aggregateContent({ event, data });
+        if (data?.delta.type === StepTypes.TOOL_CALLS) {
+          await emitEvent(res, streamId, { event, data });
+        } else if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
+          await emitEvent(res, streamId, { event, data });
+        } else if (!metadata?.hide_sequential_outputs) {
+          await emitEvent(res, streamId, { event, data });
+        }
       },
     },
     [GraphEvents.ON_RUN_STEP_COMPLETED]: {
@@ -239,15 +196,15 @@ function getDefaultHandlers({
        * @param {StreamEventData & { result: ToolEndData }} data - The event data.
        * @param {GraphRunnableConfig['configurable']} [metadata] The runnable metadata.
        */
-      handle: (event, data, metadata) => {
-        if (data?.result != null) {
-          emitEvent(res, streamId, { event, data });
-        } else if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
-          emitEvent(res, streamId, { event, data });
-        } else if (!metadata?.hide_sequential_outputs) {
-          emitEvent(res, streamId, { event, data });
-        }
+      handle: async (event, data, metadata) => {
         aggregateContent({ event, data });
+        if (data?.result != null) {
+          await emitEvent(res, streamId, { event, data });
+        } else if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
+          await emitEvent(res, streamId, { event, data });
+        } else if (!metadata?.hide_sequential_outputs) {
+          await emitEvent(res, streamId, { event, data });
+        }
       },
     },
     [GraphEvents.ON_MESSAGE_DELTA]: {
@@ -257,13 +214,13 @@ function getDefaultHandlers({
        * @param {StreamEventData} data - The event data.
        * @param {GraphRunnableConfig['configurable']} [metadata] The runnable metadata.
        */
-      handle: (event, data, metadata) => {
-        if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
-          emitEvent(res, streamId, { event, data });
-        } else if (!metadata?.hide_sequential_outputs) {
-          emitEvent(res, streamId, { event, data });
-        }
+      handle: async (event, data, metadata) => {
         aggregateContent({ event, data });
+        if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
+          await emitEvent(res, streamId, { event, data });
+        } else if (!metadata?.hide_sequential_outputs) {
+          await emitEvent(res, streamId, { event, data });
+        }
       },
     },
     [GraphEvents.ON_REASONING_DELTA]: {
@@ -273,22 +230,27 @@ function getDefaultHandlers({
        * @param {StreamEventData} data - The event data.
        * @param {GraphRunnableConfig['configurable']} [metadata] The runnable metadata.
        */
-      handle: (event, data, metadata) => {
-        if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
-          emitEvent(res, streamId, { event, data });
-        } else if (!metadata?.hide_sequential_outputs) {
-          emitEvent(res, streamId, { event, data });
-        }
+      handle: async (event, data, metadata) => {
         aggregateContent({ event, data });
+        if (checkIfLastAgent(metadata?.last_agent_id, metadata?.langgraph_node)) {
+          await emitEvent(res, streamId, { event, data });
+        } else if (!metadata?.hide_sequential_outputs) {
+          await emitEvent(res, streamId, { event, data });
+        }
       },
     },
   };
 
+  if (toolExecuteOptions) {
+    handlers[GraphEvents.ON_TOOL_EXECUTE] = createToolExecuteHandler(toolExecuteOptions);
+  }
+
   return handlers;
 }
 
 /**
  * Helper to write attachment events either to res or to job emitter.
+ * Note: Attachments are not order-sensitive like deltas, so fire-and-forget is acceptable.
  * @param {ServerResponse} res - The server response object
  * @param {string | null} streamId - The stream ID for resumable mode, or null for standard mode
  * @param {Object} attachment - The attachment data
@@ -441,10 +403,10 @@ function createToolEndCallback({ req, res, artifactPromises, streamId = null })
       return;
     }
 
-    {
-      if (output.name !== Tools.execute_code) {
-        return;
-      }
+    const isCodeTool =
+      output.name === Tools.execute_code || output.name === Constants.PROGRAMMATIC_TOOL_CALLING;
+    if (!isCodeTool) {
+      return;
     }
 
     if (!output.artifact.files) {
@@ -488,7 +450,226 @@ function createToolEndCallback({ req, res, artifactPromises, streamId = null })
   };
 }
 
+/**
+ * Helper to write attachment events in Open Responses format (librechat:attachment)
+ * @param {ServerResponse} res - The server response object
+ * @param {Object} tracker - The response tracker with sequence number
+ * @param {Object} attachment - The attachment data
+ * @param {Object} metadata - Additional metadata (messageId, conversationId)
+ */
+function writeResponsesAttachment(res, tracker, attachment, metadata) {
+  const sequenceNumber = tracker.nextSequence();
+  writeAttachmentEvent(res, sequenceNumber, attachment, {
+    messageId: metadata.run_id,
+    conversationId: metadata.thread_id,
+  });
+}
+
+/**
+ * Creates a tool end callback specifically for the Responses API.
+ * Emits attachments as `librechat:attachment` events per the Open Responses extension spec.
+ *
+ * @param {Object} params
+ * @param {ServerRequest} params.req
+ * @param {ServerResponse} params.res
+ * @param {Object} params.tracker - Response tracker with sequence number
+ * @param {Promise<MongoFile | { filename: string; filepath: string; expires: number;} | null>[]} params.artifactPromises
+ * @returns {ToolEndCallback} The tool end callback.
+ */
+function createResponsesToolEndCallback({ req, res, tracker, artifactPromises }) {
+  /**
+   * @type {ToolEndCallback}
+   */
+  return async (data, metadata) => {
+    const output = data?.output;
+    if (!output) {
+      return;
+    }
+
+    if (!output.artifact) {
+      return;
+    }
+
+    if (output.artifact[Tools.file_search]) {
+      artifactPromises.push(
+        (async () => {
+          const user = req.user;
+          const attachment = await processFileCitations({
+            user,
+            metadata,
+            appConfig: req.config,
+            toolArtifact: output.artifact,
+            toolCallId: output.tool_call_id,
+          });
+          if (!attachment) {
+            return null;
+          }
+          // For Responses API, emit attachment during streaming
+          if (res.headersSent && !res.writableEnded) {
+            writeResponsesAttachment(res, tracker, attachment, metadata);
+          }
+          return attachment;
+        })().catch((error) => {
+          logger.error('Error processing file citations:', error);
+          return null;
+        }),
+      );
+    }
+
+    if (output.artifact[Tools.ui_resources]) {
+      artifactPromises.push(
+        (async () => {
+          const attachment = {
+            type: Tools.ui_resources,
+            toolCallId: output.tool_call_id,
+            [Tools.ui_resources]: output.artifact[Tools.ui_resources].data,
+          };
+          // For Responses API, always emit attachment during streaming
+          if (res.headersSent && !res.writableEnded) {
+            writeResponsesAttachment(res, tracker, attachment, metadata);
+          }
+          return attachment;
+        })().catch((error) => {
+          logger.error('Error processing artifact content:', error);
+          return null;
+        }),
+      );
+    }
+
+    if (output.artifact[Tools.web_search]) {
+      artifactPromises.push(
+        (async () => {
+          const attachment = {
+            type: Tools.web_search,
+            toolCallId: output.tool_call_id,
+            [Tools.web_search]: { ...output.artifact[Tools.web_search] },
+          };
+          // For Responses API, always emit attachment during streaming
+          if (res.headersSent && !res.writableEnded) {
+            writeResponsesAttachment(res, tracker, attachment, metadata);
+          }
+          return attachment;
+        })().catch((error) => {
+          logger.error('Error processing artifact content:', error);
+          return null;
+        }),
+      );
+    }
+
+    if (output.artifact.content) {
+      /** @type {FormattedContent[]} */
+      const content = output.artifact.content;
+      for (let i = 0; i < content.length; i++) {
+        const part = content[i];
+        if (!part) {
+          continue;
+        }
+        if (part.type !== 'image_url') {
+          continue;
+        }
+        const { url } = part.image_url;
+        artifactPromises.push(
+          (async () => {
+            const filename = `${output.name}_img_${nanoid()}`;
+            const file_id = output.artifact.file_ids?.[i];
+            const file = await saveBase64Image(url, {
+              req,
+              file_id,
+              filename,
+              endpoint: metadata.provider,
+              context: FileContext.image_generation,
+            });
+            const fileMetadata = Object.assign(file, {
+              toolCallId: output.tool_call_id,
+            });
+
+            if (!fileMetadata) {
+              return null;
+            }
+
+            // For Responses API, emit attachment during streaming
+            if (res.headersSent && !res.writableEnded) {
+              const attachment = {
+                file_id: fileMetadata.file_id,
+                filename: fileMetadata.filename,
+                type: fileMetadata.type,
+                url: fileMetadata.filepath,
+                width: fileMetadata.width,
+                height: fileMetadata.height,
+                tool_call_id: output.tool_call_id,
+              };
+              writeResponsesAttachment(res, tracker, attachment, metadata);
+            }
+
+            return fileMetadata;
+          })().catch((error) => {
+            logger.error('Error processing artifact content:', error);
+            return null;
+          }),
+        );
+      }
+      return;
+    }
+
+    const isCodeTool =
+      output.name === Tools.execute_code || output.name === Constants.PROGRAMMATIC_TOOL_CALLING;
+    if (!isCodeTool) {
+      return;
+    }
+
+    if (!output.artifact.files) {
+      return;
+    }
+
+    for (const file of output.artifact.files) {
+      const { id, name } = file;
+      artifactPromises.push(
+        (async () => {
+          const result = await loadAuthValues({
+            userId: req.user.id,
+            authFields: [EnvVar.CODE_API_KEY],
+          });
+          const fileMetadata = await processCodeOutput({
+            req,
+            id,
+            name,
+            apiKey: result[EnvVar.CODE_API_KEY],
+            messageId: metadata.run_id,
+            toolCallId: output.tool_call_id,
+            conversationId: metadata.thread_id,
+            session_id: output.artifact.session_id,
+          });
+
+          if (!fileMetadata) {
+            return null;
+          }
+
+          // For Responses API, emit attachment during streaming
+          if (res.headersSent && !res.writableEnded) {
+            const attachment = {
+              file_id: fileMetadata.file_id,
+              filename: fileMetadata.filename,
+              type: fileMetadata.type,
+              url: fileMetadata.filepath,
+              width: fileMetadata.width,
+              height: fileMetadata.height,
+              tool_call_id: output.tool_call_id,
+            };
+            writeResponsesAttachment(res, tracker, attachment, metadata);
+          }
+
+          return fileMetadata;
+        })().catch((error) => {
+          logger.error('Error processing code output:', error);
+          return null;
+        }),
+      );
+    }
+  };
+}
+
 module.exports = {
   getDefaultHandlers,
   createToolEndCallback,
+  createResponsesToolEndCallback,
 };
diff --git a/api/server/controllers/agents/client.js b/api/server/controllers/agents/client.js
index 2b5872411b..49240a6b3b 100644
--- a/api/server/controllers/agents/client.js
+++ b/api/server/controllers/agents/client.js
@@ -1,22 +1,27 @@
 require('events').EventEmitter.defaultMaxListeners = 100;
 const { logger } = require('@librechat/data-schemas');
-const { DynamicStructuredTool } = require('@langchain/core/tools');
 const { getBufferString, HumanMessage } = require('@langchain/core/messages');
 const {
   createRun,
   Tokenizer,
   checkAccess,
-  logAxiosError,
+  buildToolSet,
   sanitizeTitle,
+  logToolError,
+  payloadParser,
   resolveHeaders,
   createSafeUser,
   initializeAgent,
   getBalanceConfig,
   getProviderConfig,
+  omitTitleOptions,
   memoryInstructions,
+  applyContextToAgent,
+  createTokenCounter,
   GenerationJobManager,
   getTransactionsConfig,
   createMemoryProcessor,
+  createMultiAgentMapper,
   filterMalformedContentParts,
 } = require('@librechat/api');
 const {
@@ -24,9 +29,7 @@ const {
   Providers,
   TitleMethod,
   formatMessage,
-  labelContentByAgent,
   formatAgentMessages,
-  getTokenCountForMessage,
   createMetadataAggregator,
 } = require('@librechat/agents');
 const {
@@ -38,7 +41,6 @@ const {
   PermissionTypes,
   isAgentsEndpoint,
   isEphemeralAgentId,
-  bedrockInputSchema,
   removeNullishValues,
 } = require('librechat-data-provider');
 const { spendTokens, spendStructuredTokens } = require('~/models/spendTokens');
@@ -51,183 +53,6 @@ const { loadAgent } = require('~/models/Agent');
 const { getMCPManager } = require('~/config');
 const db = require('~/models');
 
-const omitTitleOptions = new Set([
-  'stream',
-  'thinking',
-  'streaming',
-  'clientOptions',
-  'thinkingConfig',
-  'thinkingBudget',
-  'includeThoughts',
-  'maxOutputTokens',
-  'additionalModelRequestFields',
-]);
-
-/**
- * @param {ServerRequest} req
- * @param {Agent} agent
- * @param {string} endpoint
- */
-const payloadParser = ({ req, agent, endpoint }) => {
-  if (isAgentsEndpoint(endpoint)) {
-    return { model: undefined };
-  } else if (endpoint === EModelEndpoint.bedrock) {
-    const parsedValues = bedrockInputSchema.parse(agent.model_parameters);
-    if (parsedValues.thinking == null) {
-      parsedValues.thinking = false;
-    }
-    return parsedValues;
-  }
-  return req.body.endpointOption.model_parameters;
-};
-
-function createTokenCounter(encoding) {
-  return function (message) {
-    const countTokens = (text) => Tokenizer.getTokenCount(text, encoding);
-    return getTokenCountForMessage(message, countTokens);
-  };
-}
-
-function logToolError(graph, error, toolId) {
-  logAxiosError({
-    error,
-    message: `[api/server/controllers/agents/client.js #chatCompletion] Tool Error "${toolId}"`,
-  });
-}
-
-/** Regex pattern to match agent ID suffix (____N) */
-const AGENT_SUFFIX_PATTERN = /____(\d+)$/;
-
-/**
- * Finds the primary agent ID within a set of agent IDs.
- * Primary = no suffix (____N) or lowest suffix number.
- * @param {Set<string>} agentIds
- * @returns {string | null}
- */
-function findPrimaryAgentId(agentIds) {
-  let primaryAgentId = null;
-  let lowestSuffixIndex = Infinity;
-
-  for (const agentId of agentIds) {
-    const suffixMatch = agentId.match(AGENT_SUFFIX_PATTERN);
-    if (!suffixMatch) {
-      return agentId;
-    }
-    const suffixIndex = parseInt(suffixMatch[1], 10);
-    if (suffixIndex < lowestSuffixIndex) {
-      lowestSuffixIndex = suffixIndex;
-      primaryAgentId = agentId;
-    }
-  }
-
-  return primaryAgentId;
-}
-
-/**
- * Creates a mapMethod for getMessagesForConversation that processes agent content.
- * - Strips agentId/groupId metadata from all content
- * - For parallel agents (addedConvo with groupId): filters each group to its primary agent
- * - For handoffs (agentId without groupId): keeps all content from all agents
- * - For multi-agent: applies agent labels to content
- *
- * The key distinction:
- * - Parallel execution (addedConvo): Parts have both agentId AND groupId
- * - Handoffs: Parts only have agentId, no groupId
- *
- * @param {Agent} primaryAgent - Primary agent configuration
- * @param {Map<string, Agent>} [agentConfigs] - Additional agent configurations
- * @returns {(message: TMessage) => TMessage} Map method for processing messages
- */
-function createMultiAgentMapper(primaryAgent, agentConfigs) {
-  const hasMultipleAgents = (primaryAgent.edges?.length ?? 0) > 0 || (agentConfigs?.size ?? 0) > 0;
-
-  /** @type {Record<string, string> | null} */
-  let agentNames = null;
-  if (hasMultipleAgents) {
-    agentNames = { [primaryAgent.id]: primaryAgent.name || 'Assistant' };
-    if (agentConfigs) {
-      for (const [agentId, agentConfig] of agentConfigs.entries()) {
-        agentNames[agentId] = agentConfig.name || agentConfig.id;
-      }
-    }
-  }
-
-  return (message) => {
-    if (message.isCreatedByUser || !Array.isArray(message.content)) {
-      return message;
-    }
-
-    // Check for metadata
-    const hasAgentMetadata = message.content.some((part) => part?.agentId || part?.groupId != null);
-    if (!hasAgentMetadata) {
-      return message;
-    }
-
-    try {
-      // Build a map of groupId -> Set of agentIds, to find primary per group
-      /** @type {Map<number, Set<string>>} */
-      const groupAgentMap = new Map();
-
-      for (const part of message.content) {
-        const groupId = part?.groupId;
-        const agentId = part?.agentId;
-        if (groupId != null && agentId) {
-          if (!groupAgentMap.has(groupId)) {
-            groupAgentMap.set(groupId, new Set());
-          }
-          groupAgentMap.get(groupId).add(agentId);
-        }
-      }
-
-      // For each group, find the primary agent
-      /** @type {Map<number, string>} */
-      const groupPrimaryMap = new Map();
-      for (const [groupId, agentIds] of groupAgentMap) {
-        const primary = findPrimaryAgentId(agentIds);
-        if (primary) {
-          groupPrimaryMap.set(groupId, primary);
-        }
-      }
-
-      /** @type {Array<TMessageContentParts>} */
-      const filteredContent = [];
-      /** @type {Record<number, string>} */
-      const agentIdMap = {};
-
-      for (const part of message.content) {
-        const agentId = part?.agentId;
-        const groupId = part?.groupId;
-
-        // Filtering logic:
-        // - No groupId (handoffs): always include
-        // - Has groupId (parallel): only include if it's the primary for that group
-        const isParallelPart = groupId != null;
-        const groupPrimary = isParallelPart ? groupPrimaryMap.get(groupId) : null;
-        const shouldInclude = !isParallelPart || !agentId || agentId === groupPrimary;
-
-        if (shouldInclude) {
-          const newIndex = filteredContent.length;
-          const { agentId: _a, groupId: _g, ...cleanPart } = part;
-          filteredContent.push(cleanPart);
-          if (agentId && hasMultipleAgents) {
-            agentIdMap[newIndex] = agentId;
-          }
-        }
-      }
-
-      const finalContent =
-        Object.keys(agentIdMap).length > 0 && agentNames
-          ? labelContentByAgent(filteredContent, agentIdMap, agentNames)
-          : filteredContent;
-
-      return { ...message, content: finalContent };
-    } catch (error) {
-      logger.error('[AgentClient] Error processing multi-agent message:', error);
-      return message;
-    }
-  };
-}
-
 class AgentClient extends BaseClient {
   constructor(options = {}) {
     super(null, options);
@@ -295,14 +120,9 @@ class AgentClient extends BaseClient {
   checkVisionRequest() {}
 
   getSaveOptions() {
-    // TODO:
-    // would need to be override settings; otherwise, model needs to be undefined
-    // model: this.override.model,
-    // instructions: this.override.instructions,
-    // additional_instructions: this.override.additional_instructions,
     let runOptions = {};
     try {
-      runOptions = payloadParser(this.options);
+      runOptions = payloadParser(this.options) ?? {};
     } catch (error) {
       logger.error(
         '[api/server/controllers/agents/client.js #getSaveOptions] Error parsing options',
@@ -313,14 +133,14 @@ class AgentClient extends BaseClient {
     return removeNullishValues(
       Object.assign(
         {
+          spec: this.options.spec,
+          iconURL: this.options.iconURL,
           endpoint: this.options.endpoint,
           agent_id: this.options.agent.id,
           modelLabel: this.options.modelLabel,
-          maxContextTokens: this.options.maxContextTokens,
           resendFiles: this.options.resendFiles,
           imageDetail: this.options.imageDetail,
-          spec: this.options.spec,
-          iconURL: this.options.iconURL,
+          maxContextTokens: this.maxContextTokens,
         },
         // TODO: PARSE OPTIONS BY PROVIDER, MAY CONTAIN SENSITIVE DATA
         runOptions,
@@ -328,11 +148,13 @@ class AgentClient extends BaseClient {
     );
   }
 
+  /**
+   * Returns build message options. For AgentClient, agent-specific instructions
+   * are retrieved directly from agent objects in buildMessages, so this returns empty.
+   * @returns {Object} Empty options object
+   */
   getBuildMessagesOptions() {
-    return {
-      instructions: this.options.agent.instructions,
-      additional_instructions: this.options.agent.additional_instructions,
-    };
+    return {};
   }
 
   /**
@@ -355,12 +177,7 @@ class AgentClient extends BaseClient {
     return files;
   }
 
-  async buildMessages(
-    messages,
-    parentMessageId,
-    { instructions = null, additional_instructions = null },
-    opts,
-  ) {
+  async buildMessages(messages, parentMessageId, _buildOptions, opts) {
     /** Always pass mapMethod; getMessagesForConversation applies it only to messages with addedConvo flag */
     const orderedMessages = this.constructor.getMessagesForConversation({
       messages,
@@ -374,11 +191,29 @@ class AgentClient extends BaseClient {
     /** @type {number | undefined} */
     let promptTokens;
 
-    /** @type {string} */
-    let systemContent = [instructions ?? '', additional_instructions ?? '']
-      .filter(Boolean)
-      .join('\n')
-      .trim();
+    /**
+     * Extract base instructions for all agents (combines instructions + additional_instructions).
+     * This must be done before applying context to preserve the original agent configuration.
+     */
+    const extractBaseInstructions = (agent) => {
+      const baseInstructions = [agent.instructions ?? '', agent.additional_instructions ?? '']
+        .filter(Boolean)
+        .join('\n')
+        .trim();
+      agent.instructions = baseInstructions;
+      return agent;
+    };
+
+    /** Collect all agents for unified processing, extracting base instructions during collection */
+    const allAgents = [
+      { agent: extractBaseInstructions(this.options.agent), agentId: this.options.agent.id },
+      ...(this.agentConfigs?.size > 0
+        ? Array.from(this.agentConfigs.entries()).map(([agentId, agent]) => ({
+            agent: extractBaseInstructions(agent),
+            agentId,
+          }))
+        : []),
+    ];
 
     if (this.options.attachments) {
       const attachments = await this.options.attachments;
@@ -413,6 +248,7 @@ class AgentClient extends BaseClient {
         assistantName: this.options?.modelLabel,
       });
 
+      /** For non-latest messages, prepend file context directly to message content */
       if (message.fileContext && i !== orderedMessages.length - 1) {
         if (typeof formattedMessage.content === 'string') {
           formattedMessage.content = message.fileContext + '\n' + formattedMessage.content;
@@ -422,8 +258,6 @@ class AgentClient extends BaseClient {
             ? (textPart.text = message.fileContext + '\n' + textPart.text)
             : formattedMessage.content.unshift({ type: 'text', text: message.fileContext });
         }
-      } else if (message.fileContext && i === orderedMessages.length - 1) {
-        systemContent = [systemContent, message.fileContext].join('\n');
       }
 
       const needsTokenCount =
@@ -456,46 +290,35 @@ class AgentClient extends BaseClient {
       return formattedMessage;
     });
 
+    /**
+     * Build shared run context - applies to ALL agents in the run.
+     * This includes: file context (latest message), augmented prompt (RAG), memory context.
+     */
+    const sharedRunContextParts = [];
+
+    /** File context from the latest message (attachments) */
+    const latestMessage = orderedMessages[orderedMessages.length - 1];
+    if (latestMessage?.fileContext) {
+      sharedRunContextParts.push(latestMessage.fileContext);
+    }
+
+    /** Augmented prompt from RAG/context handlers */
     if (this.contextHandlers) {
       this.augmentedPrompt = await this.contextHandlers.createContext();
-      systemContent = this.augmentedPrompt + systemContent;
-    }
-
-    // Inject MCP server instructions if available
-    const ephemeralAgent = this.options.req.body.ephemeralAgent;
-    let mcpServers = [];
-
-    // Check for ephemeral agent MCP servers
-    if (ephemeralAgent && ephemeralAgent.mcp && ephemeralAgent.mcp.length > 0) {
-      mcpServers = ephemeralAgent.mcp;
-    }
-    // Check for regular agent MCP tools
-    else if (this.options.agent && this.options.agent.tools) {
-      mcpServers = this.options.agent.tools
-        .filter(
-          (tool) =>
-            tool instanceof DynamicStructuredTool && tool.name.includes(Constants.mcp_delimiter),
-        )
-        .map((tool) => tool.name.split(Constants.mcp_delimiter).pop())
-        .filter(Boolean);
-    }
-
-    if (mcpServers.length > 0) {
-      try {
-        const mcpInstructions = await getMCPManager().formatInstructionsForContext(mcpServers);
-        if (mcpInstructions) {
-          systemContent = [systemContent, mcpInstructions].filter(Boolean).join('\n\n');
-          logger.debug('[AgentClient] Injected MCP instructions for servers:', mcpServers);
-        }
-      } catch (error) {
-        logger.error('[AgentClient] Failed to inject MCP instructions:', error);
+      if (this.augmentedPrompt) {
+        sharedRunContextParts.push(this.augmentedPrompt);
       }
     }
 
-    if (systemContent) {
-      this.options.agent.instructions = systemContent;
+    /** Memory context (user preferences/memories) */
+    const withoutKeys = await this.useMemory();
+    if (withoutKeys) {
+      const memoryContext = `${memoryInstructions}\n\n# Existing memory about the user:\n${withoutKeys}`;
+      sharedRunContextParts.push(memoryContext);
     }
 
+    const sharedRunContext = sharedRunContextParts.join('\n\n');
+
     /** @type {Record<string, number> | undefined} */
     let tokenCountMap;
 
@@ -521,14 +344,27 @@ class AgentClient extends BaseClient {
       opts.getReqData({ promptTokens });
     }
 
-    const withoutKeys = await this.useMemory();
-    if (withoutKeys) {
-      systemContent += `${memoryInstructions}\n\n# Existing memory about the user:\n${withoutKeys}`;
-    }
-
-    if (systemContent) {
-      this.options.agent.instructions = systemContent;
-    }
+    /**
+     * Apply context to all agents.
+     * Each agent gets: shared run context + their own base instructions + their own MCP instructions.
+     *
+     * NOTE: This intentionally mutates agent objects in place. The agentConfigs Map
+     * holds references to config objects that will be passed to the graph runtime.
+     */
+    const ephemeralAgent = this.options.req.body.ephemeralAgent;
+    const mcpManager = getMCPManager();
+    await Promise.all(
+      allAgents.map(({ agent, agentId }) =>
+        applyContextToAgent({
+          agent,
+          agentId,
+          logger,
+          mcpManager,
+          sharedRunContext,
+          ephemeralAgent: agentId === this.options.agent.id ? ephemeralAgent : undefined,
+        }),
+      ),
+    );
 
     return result;
   }
@@ -600,6 +436,8 @@ class AgentClient extends BaseClient {
           agent_id: memoryConfig.agent.id,
           endpoint: EModelEndpoint.agents,
         });
+      } else if (memoryConfig.agent?.id != null) {
+        prelimAgent = this.options.agent;
       } else if (
         memoryConfig.agent?.id == null &&
         memoryConfig.agent?.model != null &&
@@ -614,6 +452,10 @@ class AgentClient extends BaseClient {
       );
     }
 
+    if (!prelimAgent) {
+      return;
+    }
+
     const agent = await initializeAgent(
       {
         req: this.options.req,
@@ -633,6 +475,7 @@ class AgentClient extends BaseClient {
         updateFilesUsage: db.updateFilesUsage,
         getUserKeyValues: db.getUserKeyValues,
         getToolFilesByIds: db.getToolFilesByIds,
+        getCodeGeneratedFiles: db.getCodeGeneratedFiles,
       },
     );
 
@@ -945,13 +788,13 @@ class AgentClient extends BaseClient {
           },
           user: createSafeUser(this.options.req.user),
         },
-        recursionLimit: agentsEConfig?.recursionLimit ?? 25,
+        recursionLimit: agentsEConfig?.recursionLimit ?? 50,
         signal: abortController.signal,
         streamMode: 'values',
         version: 'v2',
       };
 
-      const toolSet = new Set((this.options.agent.tools ?? []).map((tool) => tool && tool.name));
+      const toolSet = buildToolSet(this.options.agent);
       let { messages: initialMessages, indexTokenCountMap } = formatAgentMessages(
         payload,
         this.indexTokenCountMap,
@@ -1012,6 +855,7 @@ class AgentClient extends BaseClient {
 
         run = await createRun({
           agents,
+          messages,
           indexTokenCountMap,
           runId: this.responseMessageId,
           signal: abortController.signal,
@@ -1084,11 +928,20 @@ class AgentClient extends BaseClient {
           this.artifactPromises.push(...attachments);
         }
 
-        await this.recordCollectedUsage({
-          context: 'message',
-          balance: balanceConfig,
-          transactions: transactionsConfig,
-        });
+        /** Skip token spending if aborted - the abort handler (abortMiddleware.js) handles it
+        This prevents double-spending when user aborts via `/api/agents/chat/abort` */
+        const wasAborted = abortController?.signal?.aborted;
+        if (!wasAborted) {
+          await this.recordCollectedUsage({
+            context: 'message',
+            balance: balanceConfig,
+            transactions: transactionsConfig,
+          });
+        } else {
+          logger.debug(
+            '[api/server/controllers/agents/client.js #chatCompletion] Skipping token spending - handled by abort middleware',
+          );
+        }
       } catch (err) {
         logger.error(
           '[api/server/controllers/agents/client.js #chatCompletion] Error in cleanup phase',
diff --git a/api/server/controllers/agents/client.test.js b/api/server/controllers/agents/client.test.js
index 14f0df9bb0..9dd3567047 100644
--- a/api/server/controllers/agents/client.test.js
+++ b/api/server/controllers/agents/client.test.js
@@ -12,6 +12,17 @@ jest.mock('@librechat/agents', () => ({
 
 jest.mock('@librechat/api', () => ({
   ...jest.requireActual('@librechat/api'),
+  checkAccess: jest.fn(),
+  initializeAgent: jest.fn(),
+  createMemoryProcessor: jest.fn(),
+}));
+
+jest.mock('~/models/Agent', () => ({
+  loadAgent: jest.fn(),
+}));
+
+jest.mock('~/models/Role', () => ({
+  getRoleByName: jest.fn(),
 }));
 
 // Mock getMCPManager
@@ -1310,8 +1321,8 @@ describe('AgentClient - titleConvo', () => {
       expect(client.options.agent.instructions).toContain('# MCP Server Instructions');
       expect(client.options.agent.instructions).toContain('Use these tools carefully');
 
-      // Verify the base instructions are also included
-      expect(client.options.agent.instructions).toContain('Base instructions');
+      // Verify the base instructions are also included (from agent config, not buildOptions)
+      expect(client.options.agent.instructions).toContain('Base agent instructions');
     });
 
     it('should handle MCP instructions with ephemeral agent', async () => {
@@ -1373,8 +1384,8 @@ describe('AgentClient - titleConvo', () => {
         additional_instructions: null,
       });
 
-      // Verify the instructions still work without MCP content
-      expect(client.options.agent.instructions).toBe('Base instructions only');
+      // Verify the instructions still work without MCP content (from agent config, not buildOptions)
+      expect(client.options.agent.instructions).toBe('Base agent instructions');
       expect(client.options.agent.instructions).not.toContain('[object Promise]');
     });
 
@@ -1398,8 +1409,8 @@ describe('AgentClient - titleConvo', () => {
         additional_instructions: null,
       });
 
-      // Should still have base instructions without MCP content
-      expect(client.options.agent.instructions).toContain('Base instructions');
+      // Should still have base instructions without MCP content (from agent config, not buildOptions)
+      expect(client.options.agent.instructions).toContain('Base agent instructions');
       expect(client.options.agent.instructions).not.toContain('[object Promise]');
     });
   });
@@ -1849,4 +1860,400 @@ describe('AgentClient - titleConvo', () => {
       });
     });
   });
+
+  describe('buildMessages - memory context for parallel agents', () => {
+    let client;
+    let mockReq;
+    let mockRes;
+    let mockAgent;
+    let mockOptions;
+
+    beforeEach(() => {
+      jest.clearAllMocks();
+
+      mockAgent = {
+        id: 'primary-agent',
+        name: 'Primary Agent',
+        endpoint: EModelEndpoint.openAI,
+        provider: EModelEndpoint.openAI,
+        instructions: 'Primary agent instructions',
+        model_parameters: {
+          model: 'gpt-4',
+        },
+        tools: [],
+      };
+
+      mockReq = {
+        user: {
+          id: 'user-123',
+          personalization: {
+            memories: true,
+          },
+        },
+        body: {
+          endpoint: EModelEndpoint.openAI,
+        },
+        config: {
+          memory: {
+            disabled: false,
+          },
+        },
+      };
+
+      mockRes = {};
+
+      mockOptions = {
+        req: mockReq,
+        res: mockRes,
+        agent: mockAgent,
+        endpoint: EModelEndpoint.agents,
+      };
+
+      client = new AgentClient(mockOptions);
+      client.conversationId = 'convo-123';
+      client.responseMessageId = 'response-123';
+      client.shouldSummarize = false;
+      client.maxContextTokens = 4096;
+    });
+
+    it('should pass memory context to parallel agents (addedConvo)', async () => {
+      const memoryContent = 'User prefers dark mode. User is a software developer.';
+      client.useMemory = jest.fn().mockResolvedValue(memoryContent);
+
+      const parallelAgent1 = {
+        id: 'parallel-agent-1',
+        name: 'Parallel Agent 1',
+        instructions: 'Parallel agent 1 instructions',
+        provider: EModelEndpoint.openAI,
+      };
+
+      const parallelAgent2 = {
+        id: 'parallel-agent-2',
+        name: 'Parallel Agent 2',
+        instructions: 'Parallel agent 2 instructions',
+        provider: EModelEndpoint.anthropic,
+      };
+
+      client.agentConfigs = new Map([
+        ['parallel-agent-1', parallelAgent1],
+        ['parallel-agent-2', parallelAgent2],
+      ]);
+
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: null,
+          sender: 'User',
+          text: 'Hello',
+          isCreatedByUser: true,
+        },
+      ];
+
+      await client.buildMessages(messages, null, {
+        instructions: 'Base instructions',
+        additional_instructions: null,
+      });
+
+      expect(client.useMemory).toHaveBeenCalled();
+
+      // Verify primary agent has its configured instructions (not from buildOptions) and memory context
+      expect(client.options.agent.instructions).toContain('Primary agent instructions');
+      expect(client.options.agent.instructions).toContain(memoryContent);
+
+      expect(parallelAgent1.instructions).toContain('Parallel agent 1 instructions');
+      expect(parallelAgent1.instructions).toContain(memoryContent);
+
+      expect(parallelAgent2.instructions).toContain('Parallel agent 2 instructions');
+      expect(parallelAgent2.instructions).toContain(memoryContent);
+    });
+
+    it('should not modify parallel agents when no memory context is available', async () => {
+      client.useMemory = jest.fn().mockResolvedValue(undefined);
+
+      const parallelAgent = {
+        id: 'parallel-agent-1',
+        name: 'Parallel Agent 1',
+        instructions: 'Original parallel instructions',
+        provider: EModelEndpoint.openAI,
+      };
+
+      client.agentConfigs = new Map([['parallel-agent-1', parallelAgent]]);
+
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: null,
+          sender: 'User',
+          text: 'Hello',
+          isCreatedByUser: true,
+        },
+      ];
+
+      await client.buildMessages(messages, null, {
+        instructions: 'Base instructions',
+        additional_instructions: null,
+      });
+
+      expect(parallelAgent.instructions).toBe('Original parallel instructions');
+    });
+
+    it('should handle parallel agents without existing instructions', async () => {
+      const memoryContent = 'User is a data scientist.';
+      client.useMemory = jest.fn().mockResolvedValue(memoryContent);
+
+      const parallelAgentNoInstructions = {
+        id: 'parallel-agent-no-instructions',
+        name: 'Parallel Agent No Instructions',
+        provider: EModelEndpoint.openAI,
+      };
+
+      client.agentConfigs = new Map([
+        ['parallel-agent-no-instructions', parallelAgentNoInstructions],
+      ]);
+
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: null,
+          sender: 'User',
+          text: 'Hello',
+          isCreatedByUser: true,
+        },
+      ];
+
+      await client.buildMessages(messages, null, {
+        instructions: null,
+        additional_instructions: null,
+      });
+
+      expect(parallelAgentNoInstructions.instructions).toContain(memoryContent);
+    });
+
+    it('should not modify agentConfigs when none exist', async () => {
+      const memoryContent = 'User prefers concise responses.';
+      client.useMemory = jest.fn().mockResolvedValue(memoryContent);
+
+      client.agentConfigs = null;
+
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: null,
+          sender: 'User',
+          text: 'Hello',
+          isCreatedByUser: true,
+        },
+      ];
+
+      await expect(
+        client.buildMessages(messages, null, {
+          instructions: 'Base instructions',
+          additional_instructions: null,
+        }),
+      ).resolves.not.toThrow();
+
+      expect(client.options.agent.instructions).toContain(memoryContent);
+    });
+
+    it('should handle empty agentConfigs map', async () => {
+      const memoryContent = 'User likes detailed explanations.';
+      client.useMemory = jest.fn().mockResolvedValue(memoryContent);
+
+      client.agentConfigs = new Map();
+
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: null,
+          sender: 'User',
+          text: 'Hello',
+          isCreatedByUser: true,
+        },
+      ];
+
+      await expect(
+        client.buildMessages(messages, null, {
+          instructions: 'Base instructions',
+          additional_instructions: null,
+        }),
+      ).resolves.not.toThrow();
+
+      expect(client.options.agent.instructions).toContain(memoryContent);
+    });
+  });
+
+  describe('useMemory method - prelimAgent assignment', () => {
+    let client;
+    let mockReq;
+    let mockRes;
+    let mockAgent;
+    let mockOptions;
+    let mockCheckAccess;
+    let mockLoadAgent;
+    let mockInitializeAgent;
+    let mockCreateMemoryProcessor;
+
+    beforeEach(() => {
+      jest.clearAllMocks();
+
+      mockAgent = {
+        id: 'agent-123',
+        endpoint: EModelEndpoint.openAI,
+        provider: EModelEndpoint.openAI,
+        instructions: 'Test instructions',
+        model: 'gpt-4',
+        model_parameters: {
+          model: 'gpt-4',
+        },
+      };
+
+      mockReq = {
+        user: {
+          id: 'user-123',
+          personalization: {
+            memories: true,
+          },
+        },
+        config: {
+          memory: {
+            agent: {
+              id: 'agent-123',
+            },
+          },
+          endpoints: {
+            [EModelEndpoint.agents]: {
+              allowedProviders: [EModelEndpoint.openAI],
+            },
+          },
+        },
+      };
+
+      mockRes = {};
+
+      mockOptions = {
+        req: mockReq,
+        res: mockRes,
+        agent: mockAgent,
+      };
+
+      mockCheckAccess = require('@librechat/api').checkAccess;
+      mockLoadAgent = require('~/models/Agent').loadAgent;
+      mockInitializeAgent = require('@librechat/api').initializeAgent;
+      mockCreateMemoryProcessor = require('@librechat/api').createMemoryProcessor;
+    });
+
+    it('should use current agent when memory config agent.id matches current agent id', async () => {
+      mockCheckAccess.mockResolvedValue(true);
+      mockInitializeAgent.mockResolvedValue({
+        ...mockAgent,
+        provider: EModelEndpoint.openAI,
+      });
+      mockCreateMemoryProcessor.mockResolvedValue([undefined, jest.fn()]);
+
+      client = new AgentClient(mockOptions);
+      client.conversationId = 'convo-123';
+      client.responseMessageId = 'response-123';
+
+      await client.useMemory();
+
+      expect(mockLoadAgent).not.toHaveBeenCalled();
+      expect(mockInitializeAgent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          agent: mockAgent,
+        }),
+        expect.any(Object),
+      );
+    });
+
+    it('should load different agent when memory config agent.id differs from current agent id', async () => {
+      const differentAgentId = 'different-agent-456';
+      const differentAgent = {
+        id: differentAgentId,
+        provider: EModelEndpoint.openAI,
+        model: 'gpt-4',
+        instructions: 'Different agent instructions',
+      };
+
+      mockReq.config.memory.agent.id = differentAgentId;
+
+      mockCheckAccess.mockResolvedValue(true);
+      mockLoadAgent.mockResolvedValue(differentAgent);
+      mockInitializeAgent.mockResolvedValue({
+        ...differentAgent,
+        provider: EModelEndpoint.openAI,
+      });
+      mockCreateMemoryProcessor.mockResolvedValue([undefined, jest.fn()]);
+
+      client = new AgentClient(mockOptions);
+      client.conversationId = 'convo-123';
+      client.responseMessageId = 'response-123';
+
+      await client.useMemory();
+
+      expect(mockLoadAgent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          agent_id: differentAgentId,
+        }),
+      );
+      expect(mockInitializeAgent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          agent: differentAgent,
+        }),
+        expect.any(Object),
+      );
+    });
+
+    it('should return early when prelimAgent is undefined (no valid memory agent config)', async () => {
+      mockReq.config.memory = {
+        agent: {},
+      };
+
+      mockCheckAccess.mockResolvedValue(true);
+
+      client = new AgentClient(mockOptions);
+      client.conversationId = 'convo-123';
+      client.responseMessageId = 'response-123';
+
+      const result = await client.useMemory();
+
+      expect(result).toBeUndefined();
+      expect(mockInitializeAgent).not.toHaveBeenCalled();
+      expect(mockCreateMemoryProcessor).not.toHaveBeenCalled();
+    });
+
+    it('should create ephemeral agent when no id but model and provider are specified', async () => {
+      mockReq.config.memory = {
+        agent: {
+          model: 'gpt-4',
+          provider: EModelEndpoint.openAI,
+        },
+      };
+
+      mockCheckAccess.mockResolvedValue(true);
+      mockInitializeAgent.mockResolvedValue({
+        id: Constants.EPHEMERAL_AGENT_ID,
+        model: 'gpt-4',
+        provider: EModelEndpoint.openAI,
+      });
+      mockCreateMemoryProcessor.mockResolvedValue([undefined, jest.fn()]);
+
+      client = new AgentClient(mockOptions);
+      client.conversationId = 'convo-123';
+      client.responseMessageId = 'response-123';
+
+      await client.useMemory();
+
+      expect(mockLoadAgent).not.toHaveBeenCalled();
+      expect(mockInitializeAgent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          agent: expect.objectContaining({
+            id: Constants.EPHEMERAL_AGENT_ID,
+            model: 'gpt-4',
+            provider: EModelEndpoint.openAI,
+          }),
+        }),
+        expect.any(Object),
+      );
+    });
+  });
 });
diff --git a/api/server/controllers/agents/openai.js b/api/server/controllers/agents/openai.js
new file mode 100644
index 0000000000..b334580eb1
--- /dev/null
+++ b/api/server/controllers/agents/openai.js
@@ -0,0 +1,701 @@
+const { nanoid } = require('nanoid');
+const { logger } = require('@librechat/data-schemas');
+const { Callback, ToolEndHandler, formatAgentMessages } = require('@librechat/agents');
+const { EModelEndpoint, ResourceType, PermissionBits } = require('librechat-data-provider');
+const {
+  writeSSE,
+  createRun,
+  createChunk,
+  buildToolSet,
+  sendFinalChunk,
+  createSafeUser,
+  validateRequest,
+  initializeAgent,
+  getBalanceConfig,
+  createErrorResponse,
+  recordCollectedUsage,
+  getTransactionsConfig,
+  createToolExecuteHandler,
+  buildNonStreamingResponse,
+  createOpenAIStreamTracker,
+  createOpenAIContentAggregator,
+  isChatCompletionValidationFailure,
+} = require('@librechat/api');
+const { loadAgentTools, loadToolsForExecution } = require('~/server/services/ToolService');
+const { createToolEndCallback } = require('~/server/controllers/agents/callbacks');
+const { findAccessibleResources } = require('~/server/services/PermissionService');
+const { spendTokens, spendStructuredTokens } = require('~/models/spendTokens');
+const { getConvoFiles } = require('~/models/Conversation');
+const { getAgent, getAgents } = require('~/models/Agent');
+const db = require('~/models');
+
+/**
+ * Creates a tool loader function for the agent.
+ * @param {AbortSignal} signal - The abort signal
+ * @param {boolean} [definitionsOnly=true] - When true, returns only serializable
+ *   tool definitions without creating full tool instances (for event-driven mode)
+ */
+function createToolLoader(signal, definitionsOnly = true) {
+  return async function loadTools({
+    req,
+    res,
+    tools,
+    model,
+    agentId,
+    provider,
+    tool_options,
+    tool_resources,
+  }) {
+    const agent = { id: agentId, tools, provider, model, tool_options };
+    try {
+      return await loadAgentTools({
+        req,
+        res,
+        agent,
+        signal,
+        tool_resources,
+        definitionsOnly,
+        streamId: null, // No resumable stream for OpenAI compat
+      });
+    } catch (error) {
+      logger.error('Error loading tools for agent ' + agentId, error);
+    }
+  };
+}
+
+/**
+ * Convert content part to internal format
+ * @param {Object} part - Content part
+ * @returns {Object} Converted part
+ */
+function convertContentPart(part) {
+  if (part.type === 'text') {
+    return { type: 'text', text: part.text };
+  }
+  if (part.type === 'image_url') {
+    return { type: 'image_url', image_url: part.image_url };
+  }
+  return part;
+}
+
+/**
+ * Convert OpenAI messages to internal format
+ * @param {Array} messages - OpenAI format messages
+ * @returns {Array} Internal format messages
+ */
+function convertMessages(messages) {
+  return messages.map((msg) => {
+    let content;
+    if (typeof msg.content === 'string') {
+      content = msg.content;
+    } else if (msg.content) {
+      content = msg.content.map(convertContentPart);
+    } else {
+      content = '';
+    }
+
+    return {
+      role: msg.role,
+      content,
+      ...(msg.name && { name: msg.name }),
+      ...(msg.tool_calls && { tool_calls: msg.tool_calls }),
+      ...(msg.tool_call_id && { tool_call_id: msg.tool_call_id }),
+    };
+  });
+}
+
+/**
+ * Send an error response in OpenAI format
+ */
+function sendErrorResponse(res, statusCode, message, type = 'invalid_request_error', code = null) {
+  res.status(statusCode).json(createErrorResponse(message, type, code));
+}
+
+/**
+ * OpenAI-compatible chat completions controller for agents.
+ *
+ * POST /v1/chat/completions
+ *
+ * Request format:
+ * {
+ *   "model": "agent_id_here",
+ *   "messages": [{"role": "user", "content": "Hello!"}],
+ *   "stream": true,
+ *   "conversation_id": "optional",
+ *   "parent_message_id": "optional"
+ * }
+ */
+const OpenAIChatCompletionController = async (req, res) => {
+  const appConfig = req.config;
+  const requestStartTime = Date.now();
+
+  // Validate request
+  const validation = validateRequest(req.body);
+  if (isChatCompletionValidationFailure(validation)) {
+    return sendErrorResponse(res, 400, validation.error);
+  }
+
+  const request = validation.request;
+  const agentId = request.model;
+
+  // Look up the agent
+  const agent = await getAgent({ id: agentId });
+  if (!agent) {
+    return sendErrorResponse(
+      res,
+      404,
+      `Agent not found: ${agentId}`,
+      'invalid_request_error',
+      'model_not_found',
+    );
+  }
+
+  // Generate IDs
+  const requestId = `chatcmpl-${nanoid()}`;
+  const conversationId = request.conversation_id ?? nanoid();
+  const parentMessageId = request.parent_message_id ?? null;
+  const created = Math.floor(Date.now() / 1000);
+
+  const context = {
+    created,
+    requestId,
+    model: agentId,
+  };
+
+  logger.debug(
+    `[OpenAI API] Request ${requestId} started for agent ${agentId}, stream: ${request.stream}`,
+  );
+
+  // Set up abort controller
+  const abortController = new AbortController();
+
+  // Handle client disconnect
+  req.on('close', () => {
+    if (!abortController.signal.aborted) {
+      abortController.abort();
+      logger.debug('[OpenAI API] Client disconnected, aborting');
+    }
+  });
+
+  try {
+    // Build allowed providers set
+    const allowedProviders = new Set(
+      appConfig?.endpoints?.[EModelEndpoint.agents]?.allowedProviders,
+    );
+
+    // Create tool loader
+    const loadTools = createToolLoader(abortController.signal);
+
+    // Initialize the agent first to check for disableStreaming
+    const endpointOption = {
+      endpoint: agent.provider,
+      model_parameters: agent.model_parameters ?? {},
+    };
+
+    const primaryConfig = await initializeAgent(
+      {
+        req,
+        res,
+        loadTools,
+        requestFiles: [],
+        conversationId,
+        parentMessageId,
+        agent,
+        endpointOption,
+        allowedProviders,
+        isInitialAgent: true,
+      },
+      {
+        getConvoFiles,
+        getFiles: db.getFiles,
+        getUserKey: db.getUserKey,
+        getMessages: db.getMessages,
+        updateFilesUsage: db.updateFilesUsage,
+        getUserKeyValues: db.getUserKeyValues,
+        getUserCodeFiles: db.getUserCodeFiles,
+        getToolFilesByIds: db.getToolFilesByIds,
+        getCodeGeneratedFiles: db.getCodeGeneratedFiles,
+      },
+    );
+
+    // Determine if streaming is enabled (check both request and agent config)
+    const streamingDisabled = !!primaryConfig.model_parameters?.disableStreaming;
+    const isStreaming = request.stream === true && !streamingDisabled;
+
+    // Create tracker for streaming or aggregator for non-streaming
+    const tracker = isStreaming ? createOpenAIStreamTracker() : null;
+    const aggregator = isStreaming ? null : createOpenAIContentAggregator();
+
+    // Set up response for streaming
+    if (isStreaming) {
+      res.setHeader('Content-Type', 'text/event-stream');
+      res.setHeader('Cache-Control', 'no-cache');
+      res.setHeader('Connection', 'keep-alive');
+      res.setHeader('X-Accel-Buffering', 'no');
+      res.flushHeaders();
+
+      // Send initial chunk with role
+      const initialChunk = createChunk(context, { role: 'assistant' });
+      writeSSE(res, initialChunk);
+    }
+
+    // Create handler config for OpenAI streaming (only used when streaming)
+    const handlerConfig = isStreaming
+      ? {
+          res,
+          context,
+          tracker,
+        }
+      : null;
+
+    const collectedUsage = [];
+    /** @type {Promise<import('librechat-data-provider').TAttachment | null>[]} */
+    const artifactPromises = [];
+
+    const toolEndCallback = createToolEndCallback({ req, res, artifactPromises, streamId: null });
+
+    const toolExecuteOptions = {
+      loadTools: async (toolNames) => {
+        return loadToolsForExecution({
+          req,
+          res,
+          agent,
+          toolNames,
+          signal: abortController.signal,
+          toolRegistry: primaryConfig.toolRegistry,
+          userMCPAuthMap: primaryConfig.userMCPAuthMap,
+          tool_resources: primaryConfig.tool_resources,
+        });
+      },
+      toolEndCallback,
+    };
+
+    const openaiMessages = convertMessages(request.messages);
+
+    const toolSet = buildToolSet(primaryConfig);
+    const { messages: formattedMessages, indexTokenCountMap } = formatAgentMessages(
+      openaiMessages,
+      {},
+      toolSet,
+    );
+
+    /**
+     * Create a simple handler that processes data
+     */
+    const createHandler = (processor) => ({
+      handle: (_event, data) => {
+        if (processor) {
+          processor(data);
+        }
+      },
+    });
+
+    /**
+     * Stream text content in OpenAI format
+     */
+    const streamText = (text) => {
+      if (!text) {
+        return;
+      }
+      if (isStreaming) {
+        tracker.addText();
+        writeSSE(res, createChunk(context, { content: text }));
+      } else {
+        aggregator.addText(text);
+      }
+    };
+
+    /**
+     * Stream reasoning content in OpenAI format (OpenRouter convention)
+     */
+    const streamReasoning = (text) => {
+      if (!text) {
+        return;
+      }
+      if (isStreaming) {
+        tracker.addReasoning();
+        writeSSE(res, createChunk(context, { reasoning: text }));
+      } else {
+        aggregator.addReasoning(text);
+      }
+    };
+
+    // Event handlers for OpenAI-compatible streaming
+    const handlers = {
+      // Text content streaming
+      on_message_delta: createHandler((data) => {
+        const content = data?.delta?.content;
+        if (Array.isArray(content)) {
+          for (const part of content) {
+            if (part.type === 'text' && part.text) {
+              streamText(part.text);
+            }
+          }
+        }
+      }),
+
+      // Reasoning/thinking content streaming
+      on_reasoning_delta: createHandler((data) => {
+        const content = data?.delta?.content;
+        if (Array.isArray(content)) {
+          for (const part of content) {
+            const text = part.think || part.text;
+            if (text) {
+              streamReasoning(text);
+            }
+          }
+        }
+      }),
+
+      // Tool call initiation - streams id and name (from on_run_step)
+      on_run_step: createHandler((data) => {
+        const stepDetails = data?.stepDetails;
+        if (stepDetails?.type === 'tool_calls' && stepDetails.tool_calls) {
+          for (const tc of stepDetails.tool_calls) {
+            const toolIndex = data.index ?? 0;
+            const toolId = tc.id ?? '';
+            const toolName = tc.name ?? '';
+            const toolCall = {
+              id: toolId,
+              type: 'function',
+              function: { name: toolName, arguments: '' },
+            };
+
+            // Track tool call in tracker or aggregator
+            if (isStreaming) {
+              if (!tracker.toolCalls.has(toolIndex)) {
+                tracker.toolCalls.set(toolIndex, toolCall);
+              }
+              // Stream initial tool call chunk (like OpenAI does)
+              writeSSE(
+                res,
+                createChunk(context, {
+                  tool_calls: [{ index: toolIndex, ...toolCall }],
+                }),
+              );
+            } else {
+              if (!aggregator.toolCalls.has(toolIndex)) {
+                aggregator.toolCalls.set(toolIndex, toolCall);
+              }
+            }
+          }
+        }
+      }),
+
+      // Tool call argument streaming (from on_run_step_delta)
+      on_run_step_delta: createHandler((data) => {
+        const delta = data?.delta;
+        if (delta?.type === 'tool_calls' && delta.tool_calls) {
+          for (const tc of delta.tool_calls) {
+            const args = tc.args ?? '';
+            if (!args) {
+              continue;
+            }
+
+            const toolIndex = tc.index ?? 0;
+
+            // Update tool call arguments
+            const targetMap = isStreaming ? tracker.toolCalls : aggregator.toolCalls;
+            const tracked = targetMap.get(toolIndex);
+            if (tracked) {
+              tracked.function.arguments += args;
+            }
+
+            // Stream argument delta (only for streaming)
+            if (isStreaming) {
+              writeSSE(
+                res,
+                createChunk(context, {
+                  tool_calls: [
+                    {
+                      index: toolIndex,
+                      function: { arguments: args },
+                    },
+                  ],
+                }),
+              );
+            }
+          }
+        }
+      }),
+
+      // Usage tracking
+      on_chat_model_end: createHandler((data) => {
+        const usage = data?.output?.usage_metadata;
+        if (usage) {
+          collectedUsage.push(usage);
+          const target = isStreaming ? tracker : aggregator;
+          target.usage.promptTokens += usage.input_tokens ?? 0;
+          target.usage.completionTokens += usage.output_tokens ?? 0;
+        }
+      }),
+      on_run_step_completed: createHandler(),
+      // Use proper ToolEndHandler for processing artifacts (images, file citations, code output)
+      on_tool_end: new ToolEndHandler(toolEndCallback, logger),
+      on_chain_stream: createHandler(),
+      on_chain_end: createHandler(),
+      on_agent_update: createHandler(),
+      on_custom_event: createHandler(),
+      // Event-driven tool execution handler
+      on_tool_execute: createToolExecuteHandler(toolExecuteOptions),
+    };
+
+    // Create and run the agent
+    const userId = req.user?.id ?? 'api-user';
+
+    // Extract userMCPAuthMap from primaryConfig (needed for MCP tool connections)
+    const userMCPAuthMap = primaryConfig.userMCPAuthMap;
+
+    const run = await createRun({
+      agents: [primaryConfig],
+      messages: formattedMessages,
+      indexTokenCountMap,
+      runId: requestId,
+      signal: abortController.signal,
+      customHandlers: handlers,
+      requestBody: {
+        messageId: requestId,
+        conversationId,
+      },
+      user: { id: userId },
+    });
+
+    if (!run) {
+      throw new Error('Failed to create agent run');
+    }
+
+    // Process the stream
+    const config = {
+      runName: 'AgentRun',
+      configurable: {
+        thread_id: conversationId,
+        user_id: userId,
+        user: createSafeUser(req.user),
+        ...(userMCPAuthMap != null && { userMCPAuthMap }),
+      },
+      signal: abortController.signal,
+      streamMode: 'values',
+      version: 'v2',
+    };
+
+    await run.processStream({ messages: formattedMessages }, config, {
+      callbacks: {
+        [Callback.TOOL_ERROR]: (graph, error, toolId) => {
+          logger.error(`[OpenAI API] Tool Error "${toolId}"`, error);
+        },
+      },
+    });
+
+    // Record token usage against balance
+    const balanceConfig = getBalanceConfig(appConfig);
+    const transactionsConfig = getTransactionsConfig(appConfig);
+    recordCollectedUsage(
+      { spendTokens, spendStructuredTokens },
+      {
+        user: userId,
+        conversationId,
+        collectedUsage,
+        context: 'message',
+        balance: balanceConfig,
+        transactions: transactionsConfig,
+        model: primaryConfig.model || agent.model_parameters?.model,
+      },
+    ).catch((err) => {
+      logger.error('[OpenAI API] Error recording usage:', err);
+    });
+
+    // Finalize response
+    const duration = Date.now() - requestStartTime;
+    if (isStreaming) {
+      sendFinalChunk(handlerConfig);
+      res.end();
+      logger.debug(`[OpenAI API] Request ${requestId} completed in ${duration}ms (streaming)`);
+
+      // Wait for artifact processing after response ends (non-blocking)
+      if (artifactPromises.length > 0) {
+        Promise.all(artifactPromises).catch((artifactError) => {
+          logger.warn('[OpenAI API] Error processing artifacts:', artifactError);
+        });
+      }
+    } else {
+      // For non-streaming, wait for artifacts before sending response
+      if (artifactPromises.length > 0) {
+        try {
+          await Promise.all(artifactPromises);
+        } catch (artifactError) {
+          logger.warn('[OpenAI API] Error processing artifacts:', artifactError);
+        }
+      }
+
+      // Build usage from aggregated data
+      const usage = {
+        prompt_tokens: aggregator.usage.promptTokens,
+        completion_tokens: aggregator.usage.completionTokens,
+        total_tokens: aggregator.usage.promptTokens + aggregator.usage.completionTokens,
+      };
+
+      if (aggregator.usage.reasoningTokens > 0) {
+        usage.completion_tokens_details = {
+          reasoning_tokens: aggregator.usage.reasoningTokens,
+        };
+      }
+
+      const response = buildNonStreamingResponse(
+        context,
+        aggregator.getText(),
+        aggregator.getReasoning(),
+        aggregator.toolCalls,
+        usage,
+      );
+      res.json(response);
+      logger.debug(`[OpenAI API] Request ${requestId} completed in ${duration}ms (non-streaming)`);
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'An error occurred';
+    logger.error('[OpenAI API] Error:', error);
+
+    // Check if we already started streaming (headers sent)
+    if (res.headersSent) {
+      // Headers already sent, send error in stream
+      const errorChunk = createChunk(context, { content: `\n\nError: ${errorMessage}` }, 'stop');
+      writeSSE(res, errorChunk);
+      writeSSE(res, '[DONE]');
+      res.end();
+    } else {
+      // Forward upstream provider status codes (e.g., Anthropic 400s) instead of masking as 500
+      const statusCode =
+        typeof error?.status === 'number' && error.status >= 400 && error.status < 600
+          ? error.status
+          : 500;
+      const errorType =
+        statusCode >= 400 && statusCode < 500 ? 'invalid_request_error' : 'server_error';
+      sendErrorResponse(res, statusCode, errorMessage, errorType);
+    }
+  }
+};
+
+/**
+ * List available agents as models (filtered by remote access permissions)
+ *
+ * GET /v1/models
+ */
+const ListModelsController = async (req, res) => {
+  try {
+    const userId = req.user?.id;
+    const userRole = req.user?.role;
+
+    if (!userId) {
+      return sendErrorResponse(res, 401, 'Authentication required', 'auth_error');
+    }
+
+    // Find agents the user has remote access to (VIEW permission on REMOTE_AGENT)
+    const accessibleAgentIds = await findAccessibleResources({
+      userId,
+      role: userRole,
+      resourceType: ResourceType.REMOTE_AGENT,
+      requiredPermissions: PermissionBits.VIEW,
+    });
+
+    // Get the accessible agents
+    let agents = [];
+    if (accessibleAgentIds.length > 0) {
+      agents = await getAgents({ _id: { $in: accessibleAgentIds } });
+    }
+
+    const models = agents.map((agent) => ({
+      id: agent.id,
+      object: 'model',
+      created: Math.floor(new Date(agent.createdAt || Date.now()).getTime() / 1000),
+      owned_by: 'librechat',
+      permission: [],
+      root: agent.id,
+      parent: null,
+      // LibreChat extensions
+      name: agent.name,
+      description: agent.description,
+      provider: agent.provider,
+    }));
+
+    res.json({
+      object: 'list',
+      data: models,
+    });
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'Failed to list models';
+    logger.error('[OpenAI API] Error listing models:', error);
+    sendErrorResponse(res, 500, errorMessage, 'server_error');
+  }
+};
+
+/**
+ * Get a specific model/agent (with remote access permission check)
+ *
+ * GET /v1/models/:model
+ */
+const GetModelController = async (req, res) => {
+  try {
+    const { model } = req.params;
+    const userId = req.user?.id;
+    const userRole = req.user?.role;
+
+    if (!userId) {
+      return sendErrorResponse(res, 401, 'Authentication required', 'auth_error');
+    }
+
+    const agent = await getAgent({ id: model });
+
+    if (!agent) {
+      return sendErrorResponse(
+        res,
+        404,
+        `Model not found: ${model}`,
+        'invalid_request_error',
+        'model_not_found',
+      );
+    }
+
+    // Check if user has remote access to this agent
+    const accessibleAgentIds = await findAccessibleResources({
+      userId,
+      role: userRole,
+      resourceType: ResourceType.REMOTE_AGENT,
+      requiredPermissions: PermissionBits.VIEW,
+    });
+
+    const hasAccess = accessibleAgentIds.some((id) => id.toString() === agent._id.toString());
+
+    if (!hasAccess) {
+      return sendErrorResponse(
+        res,
+        403,
+        `No remote access to model: ${model}`,
+        'permission_error',
+        'access_denied',
+      );
+    }
+
+    res.json({
+      id: agent.id,
+      object: 'model',
+      created: Math.floor(new Date(agent.createdAt || Date.now()).getTime() / 1000),
+      owned_by: 'librechat',
+      permission: [],
+      root: agent.id,
+      parent: null,
+      // LibreChat extensions
+      name: agent.name,
+      description: agent.description,
+      provider: agent.provider,
+    });
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'Failed to get model';
+    logger.error('[OpenAI API] Error getting model:', error);
+    sendErrorResponse(res, 500, errorMessage, 'server_error');
+  }
+};
+
+module.exports = {
+  OpenAIChatCompletionController,
+  ListModelsController,
+  GetModelController,
+};
diff --git a/api/server/controllers/agents/request.js b/api/server/controllers/agents/request.js
index cf706ef89c..79387b6e89 100644
--- a/api/server/controllers/agents/request.js
+++ b/api/server/controllers/agents/request.js
@@ -67,7 +67,15 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
   let client = null;
 
   try {
+    logger.debug(`[ResumableAgentController] Creating job`, {
+      streamId,
+      conversationId,
+      reqConversationId,
+      userId,
+    });
+
     const job = await GenerationJobManager.createJob(streamId, userId, conversationId);
+    const jobCreatedAt = job.createdAt; // Capture creation time to detect job replacement
     req._resumableStreamId = streamId;
 
     // Send JSON response IMMEDIATELY so client can connect to SSE stream
@@ -272,6 +280,33 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
           });
         }
 
+        // CRITICAL: Save response message BEFORE emitting final event.
+        // This prevents race conditions where the client sends a follow-up message
+        // before the response is saved to the database, causing orphaned parentMessageIds.
+        if (client.savedMessageIds && !client.savedMessageIds.has(messageId)) {
+          await saveMessage(
+            req,
+            { ...response, user: userId, unfinished: wasAbortedBeforeComplete },
+            { context: 'api/server/controllers/agents/request.js - resumable response end' },
+          );
+        }
+
+        // Check if our job was replaced by a new request before emitting
+        // This prevents stale requests from emitting events to newer jobs
+        const currentJob = await GenerationJobManager.getJob(streamId);
+        const jobWasReplaced = !currentJob || currentJob.createdAt !== jobCreatedAt;
+
+        if (jobWasReplaced) {
+          logger.debug(`[ResumableAgentController] Skipping FINAL emit - job was replaced`, {
+            streamId,
+            originalCreatedAt: jobCreatedAt,
+            currentCreatedAt: currentJob?.createdAt,
+          });
+          // Still decrement pending request since we incremented at start
+          await decrementPendingRequest(userId);
+          return;
+        }
+
         if (!wasAbortedBeforeComplete) {
           const finalEvent = {
             final: true,
@@ -281,27 +316,35 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
             responseMessage: { ...response },
           };
 
-          GenerationJobManager.emitDone(streamId, finalEvent);
+          logger.debug(`[ResumableAgentController] Emitting FINAL event`, {
+            streamId,
+            wasAbortedBeforeComplete,
+            userMessageId: userMessage?.messageId,
+            responseMessageId: response?.messageId,
+            conversationId: conversation?.conversationId,
+          });
+
+          await GenerationJobManager.emitDone(streamId, finalEvent);
           GenerationJobManager.completeJob(streamId);
           await decrementPendingRequest(userId);
-
-          if (client.savedMessageIds && !client.savedMessageIds.has(messageId)) {
-            await saveMessage(
-              req,
-              { ...response, user: userId },
-              { context: 'api/server/controllers/agents/request.js - resumable response end' },
-            );
-          }
         } else {
           const finalEvent = {
             final: true,
             conversation,
             title: conversation.title,
             requestMessage: sanitizeMessageForTransmit(userMessage),
-            responseMessage: { ...response, error: true },
-            error: { message: 'Request was aborted' },
+            responseMessage: { ...response, unfinished: true },
           };
-          GenerationJobManager.emitDone(streamId, finalEvent);
+
+          logger.debug(`[ResumableAgentController] Emitting ABORTED FINAL event`, {
+            streamId,
+            wasAbortedBeforeComplete,
+            userMessageId: userMessage?.messageId,
+            responseMessageId: response?.messageId,
+            conversationId: conversation?.conversationId,
+          });
+
+          await GenerationJobManager.emitDone(streamId, finalEvent);
           GenerationJobManager.completeJob(streamId, 'Request aborted');
           await decrementPendingRequest(userId);
         }
@@ -334,7 +377,7 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
           // abortJob already handled emitDone and completeJob
         } else {
           logger.error(`[ResumableAgentController] Generation error for ${streamId}:`, error);
-          GenerationJobManager.emitError(streamId, error.message || 'Generation failed');
+          await GenerationJobManager.emitError(streamId, error.message || 'Generation failed');
           GenerationJobManager.completeJob(streamId, error.message);
         }
 
@@ -363,7 +406,7 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
       res.status(500).json({ error: error.message || 'Failed to start generation' });
     } else {
       // JSON already sent, emit error to stream so client can receive it
-      GenerationJobManager.emitError(streamId, error.message || 'Failed to start generation');
+      await GenerationJobManager.emitError(streamId, error.message || 'Failed to start generation');
     }
     GenerationJobManager.completeJob(streamId, error.message);
     await decrementPendingRequest(userId);
diff --git a/api/server/controllers/agents/responses.js b/api/server/controllers/agents/responses.js
new file mode 100644
index 0000000000..afdb96be9f
--- /dev/null
+++ b/api/server/controllers/agents/responses.js
@@ -0,0 +1,889 @@
+const { nanoid } = require('nanoid');
+const { v4: uuidv4 } = require('uuid');
+const { logger } = require('@librechat/data-schemas');
+const { Callback, ToolEndHandler, formatAgentMessages } = require('@librechat/agents');
+const { EModelEndpoint, ResourceType, PermissionBits } = require('librechat-data-provider');
+const {
+  createRun,
+  buildToolSet,
+  createSafeUser,
+  initializeAgent,
+  getBalanceConfig,
+  recordCollectedUsage,
+  getTransactionsConfig,
+  createToolExecuteHandler,
+  // Responses API
+  writeDone,
+  buildResponse,
+  generateResponseId,
+  isValidationFailure,
+  emitResponseCreated,
+  createResponseContext,
+  createResponseTracker,
+  setupStreamingResponse,
+  emitResponseInProgress,
+  convertInputToMessages,
+  validateResponseRequest,
+  buildAggregatedResponse,
+  createResponseAggregator,
+  sendResponsesErrorResponse,
+  createResponsesEventHandlers,
+  createAggregatorEventHandlers,
+} = require('@librechat/api');
+const {
+  createResponsesToolEndCallback,
+  createToolEndCallback,
+} = require('~/server/controllers/agents/callbacks');
+const { loadAgentTools, loadToolsForExecution } = require('~/server/services/ToolService');
+const { findAccessibleResources } = require('~/server/services/PermissionService');
+const { getConvoFiles, saveConvo, getConvo } = require('~/models/Conversation');
+const { spendTokens, spendStructuredTokens } = require('~/models/spendTokens');
+const { getAgent, getAgents } = require('~/models/Agent');
+const db = require('~/models');
+
+/** @type {import('@librechat/api').AppConfig | null} */
+let appConfig = null;
+
+/**
+ * Set the app config for the controller
+ * @param {import('@librechat/api').AppConfig} config
+ */
+function setAppConfig(config) {
+  appConfig = config;
+}
+
+/**
+ * Creates a tool loader function for the agent.
+ * @param {AbortSignal} signal - The abort signal
+ * @param {boolean} [definitionsOnly=true] - When true, returns only serializable
+ *   tool definitions without creating full tool instances (for event-driven mode)
+ */
+function createToolLoader(signal, definitionsOnly = true) {
+  return async function loadTools({
+    req,
+    res,
+    tools,
+    model,
+    agentId,
+    provider,
+    tool_options,
+    tool_resources,
+  }) {
+    const agent = { id: agentId, tools, provider, model, tool_options };
+    try {
+      return await loadAgentTools({
+        req,
+        res,
+        agent,
+        signal,
+        tool_resources,
+        definitionsOnly,
+        streamId: null,
+      });
+    } catch (error) {
+      logger.error('Error loading tools for agent ' + agentId, error);
+    }
+  };
+}
+
+/**
+ * Convert Open Responses input items to internal messages
+ * @param {import('@librechat/api').InputItem[]} input
+ * @returns {Array} Internal messages
+ */
+function convertToInternalMessages(input) {
+  return convertInputToMessages(input);
+}
+
+/**
+ * Load messages from a previous response/conversation
+ * @param {string} conversationId - The conversation/response ID
+ * @param {string} userId - The user ID
+ * @returns {Promise<Array>} Messages from the conversation
+ */
+async function loadPreviousMessages(conversationId, userId) {
+  try {
+    const messages = await db.getMessages({ conversationId, user: userId });
+    if (!messages || messages.length === 0) {
+      return [];
+    }
+
+    // Convert stored messages to internal format
+    return messages.map((msg) => {
+      const internalMsg = {
+        role: msg.isCreatedByUser ? 'user' : 'assistant',
+        content: '',
+        messageId: msg.messageId,
+      };
+
+      // Handle content - could be string or array
+      if (typeof msg.text === 'string') {
+        internalMsg.content = msg.text;
+      } else if (Array.isArray(msg.content)) {
+        // Handle content parts
+        internalMsg.content = msg.content;
+      } else if (msg.text) {
+        internalMsg.content = String(msg.text);
+      }
+
+      return internalMsg;
+    });
+  } catch (error) {
+    logger.error('[Responses API] Error loading previous messages:', error);
+    return [];
+  }
+}
+
+/**
+ * Save input messages to database
+ * @param {import('express').Request} req
+ * @param {string} conversationId
+ * @param {Array} inputMessages - Internal format messages
+ * @param {string} agentId
+ * @returns {Promise<void>}
+ */
+async function saveInputMessages(req, conversationId, inputMessages, agentId) {
+  for (const msg of inputMessages) {
+    if (msg.role === 'user') {
+      await db.saveMessage(
+        req,
+        {
+          messageId: msg.messageId || nanoid(),
+          conversationId,
+          parentMessageId: null,
+          isCreatedByUser: true,
+          text: typeof msg.content === 'string' ? msg.content : JSON.stringify(msg.content),
+          sender: 'User',
+          endpoint: EModelEndpoint.agents,
+          model: agentId,
+        },
+        { context: 'Responses API - save user input' },
+      );
+    }
+  }
+}
+
+/**
+ * Save response output to database
+ * @param {import('express').Request} req
+ * @param {string} conversationId
+ * @param {string} responseId
+ * @param {import('@librechat/api').Response} response
+ * @param {string} agentId
+ * @returns {Promise<void>}
+ */
+async function saveResponseOutput(req, conversationId, responseId, response, agentId) {
+  // Extract text content from output items
+  let responseText = '';
+  for (const item of response.output) {
+    if (item.type === 'message' && item.content) {
+      for (const part of item.content) {
+        if (part.type === 'output_text' && part.text) {
+          responseText += part.text;
+        }
+      }
+    }
+  }
+
+  // Save the assistant message
+  await db.saveMessage(
+    req,
+    {
+      messageId: responseId,
+      conversationId,
+      parentMessageId: null,
+      isCreatedByUser: false,
+      text: responseText,
+      sender: 'Agent',
+      endpoint: EModelEndpoint.agents,
+      model: agentId,
+      finish_reason: response.status === 'completed' ? 'stop' : response.status,
+      tokenCount: response.usage?.output_tokens,
+    },
+    { context: 'Responses API - save assistant response' },
+  );
+}
+
+/**
+ * Save or update conversation
+ * @param {import('express').Request} req
+ * @param {string} conversationId
+ * @param {string} agentId
+ * @param {object} agent
+ * @returns {Promise<void>}
+ */
+async function saveConversation(req, conversationId, agentId, agent) {
+  await saveConvo(
+    req,
+    {
+      conversationId,
+      endpoint: EModelEndpoint.agents,
+      agentId,
+      title: agent?.name || 'Open Responses Conversation',
+      model: agent?.model,
+    },
+    { context: 'Responses API - save conversation' },
+  );
+}
+
+/**
+ * Convert stored messages to Open Responses output format
+ * @param {Array} messages - Stored messages
+ * @returns {Array} Output items
+ */
+function convertMessagesToOutputItems(messages) {
+  const output = [];
+
+  for (const msg of messages) {
+    if (!msg.isCreatedByUser) {
+      output.push({
+        type: 'message',
+        id: msg.messageId,
+        role: 'assistant',
+        status: 'completed',
+        content: [
+          {
+            type: 'output_text',
+            text: msg.text || '',
+            annotations: [],
+          },
+        ],
+      });
+    }
+  }
+
+  return output;
+}
+
+/**
+ * Create Response - POST /v1/responses
+ *
+ * Creates a model response following the Open Responses API specification.
+ * Supports both streaming and non-streaming responses.
+ *
+ * @param {import('express').Request} req
+ * @param {import('express').Response} res
+ */
+const createResponse = async (req, res) => {
+  const requestStartTime = Date.now();
+
+  // Validate request
+  const validation = validateResponseRequest(req.body);
+  if (isValidationFailure(validation)) {
+    return sendResponsesErrorResponse(res, 400, validation.error);
+  }
+
+  const request = validation.request;
+  const agentId = request.model;
+  const isStreaming = request.stream === true;
+
+  // Look up the agent
+  const agent = await getAgent({ id: agentId });
+  if (!agent) {
+    return sendResponsesErrorResponse(
+      res,
+      404,
+      `Agent not found: ${agentId}`,
+      'not_found',
+      'model_not_found',
+    );
+  }
+
+  // Generate IDs
+  const responseId = generateResponseId();
+  const conversationId = request.previous_response_id ?? uuidv4();
+  const parentMessageId = null;
+
+  // Create response context
+  const context = createResponseContext(request, responseId);
+
+  logger.debug(
+    `[Responses API] Request ${responseId} started for agent ${agentId}, stream: ${isStreaming}`,
+  );
+
+  // Set up abort controller
+  const abortController = new AbortController();
+
+  // Handle client disconnect
+  req.on('close', () => {
+    if (!abortController.signal.aborted) {
+      abortController.abort();
+      logger.debug('[Responses API] Client disconnected, aborting');
+    }
+  });
+
+  try {
+    // Build allowed providers set
+    const allowedProviders = new Set(
+      appConfig?.endpoints?.[EModelEndpoint.agents]?.allowedProviders,
+    );
+
+    // Create tool loader
+    const loadTools = createToolLoader(abortController.signal);
+
+    // Initialize the agent first to check for disableStreaming
+    const endpointOption = {
+      endpoint: agent.provider,
+      model_parameters: agent.model_parameters ?? {},
+    };
+
+    const primaryConfig = await initializeAgent(
+      {
+        req,
+        res,
+        loadTools,
+        requestFiles: [],
+        conversationId,
+        parentMessageId,
+        agent,
+        endpointOption,
+        allowedProviders,
+        isInitialAgent: true,
+      },
+      {
+        getConvoFiles,
+        getFiles: db.getFiles,
+        getUserKey: db.getUserKey,
+        getMessages: db.getMessages,
+        updateFilesUsage: db.updateFilesUsage,
+        getUserKeyValues: db.getUserKeyValues,
+        getUserCodeFiles: db.getUserCodeFiles,
+        getToolFilesByIds: db.getToolFilesByIds,
+        getCodeGeneratedFiles: db.getCodeGeneratedFiles,
+      },
+    );
+
+    // Determine if streaming is enabled (check both request and agent config)
+    const streamingDisabled = !!primaryConfig.model_parameters?.disableStreaming;
+    const actuallyStreaming = isStreaming && !streamingDisabled;
+
+    // Load previous messages if previous_response_id is provided
+    let previousMessages = [];
+    if (request.previous_response_id) {
+      const userId = req.user?.id ?? 'api-user';
+      previousMessages = await loadPreviousMessages(request.previous_response_id, userId);
+    }
+
+    // Convert input to internal messages
+    const inputMessages = convertToInternalMessages(
+      typeof request.input === 'string' ? request.input : request.input,
+    );
+
+    // Merge previous messages with new input
+    const allMessages = [...previousMessages, ...inputMessages];
+
+    const toolSet = buildToolSet(primaryConfig);
+    const { messages: formattedMessages, indexTokenCountMap } = formatAgentMessages(
+      allMessages,
+      {},
+      toolSet,
+    );
+
+    // Create tracker for streaming or aggregator for non-streaming
+    const tracker = actuallyStreaming ? createResponseTracker() : null;
+    const aggregator = actuallyStreaming ? null : createResponseAggregator();
+
+    // Set up response for streaming
+    if (actuallyStreaming) {
+      setupStreamingResponse(res);
+
+      // Create handler config
+      const handlerConfig = {
+        res,
+        context,
+        tracker,
+      };
+
+      // Emit response.created then response.in_progress per Open Responses spec
+      emitResponseCreated(handlerConfig);
+      emitResponseInProgress(handlerConfig);
+
+      // Create event handlers
+      const { handlers: responsesHandlers, finalizeStream } =
+        createResponsesEventHandlers(handlerConfig);
+
+      // Collect usage for balance tracking
+      const collectedUsage = [];
+
+      // Artifact promises for processing tool outputs
+      /** @type {Promise<import('librechat-data-provider').TAttachment | null>[]} */
+      const artifactPromises = [];
+      // Use Responses API-specific callback that emits librechat:attachment events
+      const toolEndCallback = createResponsesToolEndCallback({
+        req,
+        res,
+        tracker,
+        artifactPromises,
+      });
+
+      // Create tool execute options for event-driven tool execution
+      const toolExecuteOptions = {
+        loadTools: async (toolNames) => {
+          return loadToolsForExecution({
+            req,
+            res,
+            agent,
+            toolNames,
+            signal: abortController.signal,
+            toolRegistry: primaryConfig.toolRegistry,
+            userMCPAuthMap: primaryConfig.userMCPAuthMap,
+            tool_resources: primaryConfig.tool_resources,
+          });
+        },
+        toolEndCallback,
+      };
+
+      // Combine handlers
+      const handlers = {
+        on_message_delta: responsesHandlers.on_message_delta,
+        on_reasoning_delta: responsesHandlers.on_reasoning_delta,
+        on_run_step: responsesHandlers.on_run_step,
+        on_run_step_delta: responsesHandlers.on_run_step_delta,
+        on_chat_model_end: {
+          handle: (event, data) => {
+            responsesHandlers.on_chat_model_end.handle(event, data);
+            const usage = data?.output?.usage_metadata;
+            if (usage) {
+              collectedUsage.push(usage);
+            }
+          },
+        },
+        on_tool_end: new ToolEndHandler(toolEndCallback, logger),
+        on_run_step_completed: { handle: () => {} },
+        on_chain_stream: { handle: () => {} },
+        on_chain_end: { handle: () => {} },
+        on_agent_update: { handle: () => {} },
+        on_custom_event: { handle: () => {} },
+        on_tool_execute: createToolExecuteHandler(toolExecuteOptions),
+      };
+
+      // Create and run the agent
+      const userId = req.user?.id ?? 'api-user';
+      const userMCPAuthMap = primaryConfig.userMCPAuthMap;
+
+      const run = await createRun({
+        agents: [primaryConfig],
+        messages: formattedMessages,
+        indexTokenCountMap,
+        runId: responseId,
+        signal: abortController.signal,
+        customHandlers: handlers,
+        requestBody: {
+          messageId: responseId,
+          conversationId,
+        },
+        user: { id: userId },
+      });
+
+      if (!run) {
+        throw new Error('Failed to create agent run');
+      }
+
+      // Process the stream
+      const config = {
+        runName: 'AgentRun',
+        configurable: {
+          thread_id: conversationId,
+          user_id: userId,
+          user: createSafeUser(req.user),
+          ...(userMCPAuthMap != null && { userMCPAuthMap }),
+        },
+        signal: abortController.signal,
+        streamMode: 'values',
+        version: 'v2',
+      };
+
+      await run.processStream({ messages: formattedMessages }, config, {
+        callbacks: {
+          [Callback.TOOL_ERROR]: (graph, error, toolId) => {
+            logger.error(`[Responses API] Tool Error "${toolId}"`, error);
+          },
+        },
+      });
+
+      // Record token usage against balance
+      const balanceConfig = getBalanceConfig(req.config);
+      const transactionsConfig = getTransactionsConfig(req.config);
+      recordCollectedUsage(
+        { spendTokens, spendStructuredTokens },
+        {
+          user: userId,
+          conversationId,
+          collectedUsage,
+          context: 'message',
+          balance: balanceConfig,
+          transactions: transactionsConfig,
+          model: primaryConfig.model || agent.model_parameters?.model,
+        },
+      ).catch((err) => {
+        logger.error('[Responses API] Error recording usage:', err);
+      });
+
+      // Finalize the stream
+      finalizeStream();
+      res.end();
+
+      const duration = Date.now() - requestStartTime;
+      logger.debug(`[Responses API] Request ${responseId} completed in ${duration}ms (streaming)`);
+
+      // Save to database if store: true
+      if (request.store === true) {
+        try {
+          // Save conversation
+          await saveConversation(req, conversationId, agentId, agent);
+
+          // Save input messages
+          await saveInputMessages(req, conversationId, inputMessages, agentId);
+
+          // Build response for saving (use tracker with buildResponse for streaming)
+          const finalResponse = buildResponse(context, tracker, 'completed');
+          await saveResponseOutput(req, conversationId, responseId, finalResponse, agentId);
+
+          logger.debug(
+            `[Responses API] Stored response ${responseId} in conversation ${conversationId}`,
+          );
+        } catch (saveError) {
+          logger.error('[Responses API] Error saving response:', saveError);
+          // Don't fail the request if saving fails
+        }
+      }
+
+      // Wait for artifact processing after response ends (non-blocking)
+      if (artifactPromises.length > 0) {
+        Promise.all(artifactPromises).catch((artifactError) => {
+          logger.warn('[Responses API] Error processing artifacts:', artifactError);
+        });
+      }
+    } else {
+      const aggregatorHandlers = createAggregatorEventHandlers(aggregator);
+
+      // Collect usage for balance tracking
+      const collectedUsage = [];
+
+      /** @type {Promise<import('librechat-data-provider').TAttachment | null>[]} */
+      const artifactPromises = [];
+      const toolEndCallback = createToolEndCallback({ req, res, artifactPromises, streamId: null });
+
+      const toolExecuteOptions = {
+        loadTools: async (toolNames) => {
+          return loadToolsForExecution({
+            req,
+            res,
+            agent,
+            toolNames,
+            signal: abortController.signal,
+            toolRegistry: primaryConfig.toolRegistry,
+            userMCPAuthMap: primaryConfig.userMCPAuthMap,
+            tool_resources: primaryConfig.tool_resources,
+          });
+        },
+        toolEndCallback,
+      };
+
+      const handlers = {
+        on_message_delta: aggregatorHandlers.on_message_delta,
+        on_reasoning_delta: aggregatorHandlers.on_reasoning_delta,
+        on_run_step: aggregatorHandlers.on_run_step,
+        on_run_step_delta: aggregatorHandlers.on_run_step_delta,
+        on_chat_model_end: {
+          handle: (event, data) => {
+            aggregatorHandlers.on_chat_model_end.handle(event, data);
+            const usage = data?.output?.usage_metadata;
+            if (usage) {
+              collectedUsage.push(usage);
+            }
+          },
+        },
+        on_tool_end: new ToolEndHandler(toolEndCallback, logger),
+        on_run_step_completed: { handle: () => {} },
+        on_chain_stream: { handle: () => {} },
+        on_chain_end: { handle: () => {} },
+        on_agent_update: { handle: () => {} },
+        on_custom_event: { handle: () => {} },
+        on_tool_execute: createToolExecuteHandler(toolExecuteOptions),
+      };
+
+      const userId = req.user?.id ?? 'api-user';
+      const userMCPAuthMap = primaryConfig.userMCPAuthMap;
+
+      const run = await createRun({
+        agents: [primaryConfig],
+        messages: formattedMessages,
+        indexTokenCountMap,
+        runId: responseId,
+        signal: abortController.signal,
+        customHandlers: handlers,
+        requestBody: {
+          messageId: responseId,
+          conversationId,
+        },
+        user: { id: userId },
+      });
+
+      if (!run) {
+        throw new Error('Failed to create agent run');
+      }
+
+      const config = {
+        runName: 'AgentRun',
+        configurable: {
+          thread_id: conversationId,
+          user_id: userId,
+          user: createSafeUser(req.user),
+          ...(userMCPAuthMap != null && { userMCPAuthMap }),
+        },
+        signal: abortController.signal,
+        streamMode: 'values',
+        version: 'v2',
+      };
+
+      await run.processStream({ messages: formattedMessages }, config, {
+        callbacks: {
+          [Callback.TOOL_ERROR]: (graph, error, toolId) => {
+            logger.error(`[Responses API] Tool Error "${toolId}"`, error);
+          },
+        },
+      });
+
+      // Record token usage against balance
+      const balanceConfig = getBalanceConfig(req.config);
+      const transactionsConfig = getTransactionsConfig(req.config);
+      recordCollectedUsage(
+        { spendTokens, spendStructuredTokens },
+        {
+          user: userId,
+          conversationId,
+          collectedUsage,
+          context: 'message',
+          balance: balanceConfig,
+          transactions: transactionsConfig,
+          model: primaryConfig.model || agent.model_parameters?.model,
+        },
+      ).catch((err) => {
+        logger.error('[Responses API] Error recording usage:', err);
+      });
+
+      if (artifactPromises.length > 0) {
+        try {
+          await Promise.all(artifactPromises);
+        } catch (artifactError) {
+          logger.warn('[Responses API] Error processing artifacts:', artifactError);
+        }
+      }
+
+      const response = buildAggregatedResponse(context, aggregator);
+
+      if (request.store === true) {
+        try {
+          await saveConversation(req, conversationId, agentId, agent);
+
+          await saveInputMessages(req, conversationId, inputMessages, agentId);
+
+          await saveResponseOutput(req, conversationId, responseId, response, agentId);
+
+          logger.debug(
+            `[Responses API] Stored response ${responseId} in conversation ${conversationId}`,
+          );
+        } catch (saveError) {
+          logger.error('[Responses API] Error saving response:', saveError);
+          // Don't fail the request if saving fails
+        }
+      }
+
+      res.json(response);
+
+      const duration = Date.now() - requestStartTime;
+      logger.debug(
+        `[Responses API] Request ${responseId} completed in ${duration}ms (non-streaming)`,
+      );
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'An error occurred';
+    logger.error('[Responses API] Error:', error);
+
+    // Check if we already started streaming (headers sent)
+    if (res.headersSent) {
+      // Headers already sent, write error event and close
+      writeDone(res);
+      res.end();
+    } else {
+      // Forward upstream provider status codes (e.g., Anthropic 400s) instead of masking as 500
+      const statusCode =
+        typeof error?.status === 'number' && error.status >= 400 && error.status < 600
+          ? error.status
+          : 500;
+      const errorType = statusCode >= 400 && statusCode < 500 ? 'invalid_request' : 'server_error';
+      sendResponsesErrorResponse(res, statusCode, errorMessage, errorType);
+    }
+  }
+};
+
+/**
+ * List available agents as models - GET /v1/models (also works with /v1/responses/models)
+ *
+ * Returns a list of available agents the user has remote access to.
+ *
+ * @param {import('express').Request} req
+ * @param {import('express').Response} res
+ */
+const listModels = async (req, res) => {
+  try {
+    const userId = req.user?.id;
+    const userRole = req.user?.role;
+
+    if (!userId) {
+      return sendResponsesErrorResponse(res, 401, 'Authentication required', 'auth_error');
+    }
+
+    // Find agents the user has remote access to (VIEW permission on REMOTE_AGENT)
+    const accessibleAgentIds = await findAccessibleResources({
+      userId,
+      role: userRole,
+      resourceType: ResourceType.REMOTE_AGENT,
+      requiredPermissions: PermissionBits.VIEW,
+    });
+
+    // Get the accessible agents
+    let agents = [];
+    if (accessibleAgentIds.length > 0) {
+      agents = await getAgents({ _id: { $in: accessibleAgentIds } });
+    }
+
+    // Convert to models format
+    const models = agents.map((agent) => ({
+      id: agent.id,
+      object: 'model',
+      created: Math.floor(new Date(agent.createdAt).getTime() / 1000),
+      owned_by: agent.author ?? 'librechat',
+      // Additional metadata
+      name: agent.name,
+      description: agent.description,
+      provider: agent.provider,
+    }));
+
+    res.json({
+      object: 'list',
+      data: models,
+    });
+  } catch (error) {
+    logger.error('[Responses API] Error listing models:', error);
+    sendResponsesErrorResponse(
+      res,
+      500,
+      error instanceof Error ? error.message : 'Failed to list models',
+      'server_error',
+    );
+  }
+};
+
+/**
+ * Get Response - GET /v1/responses/:id
+ *
+ * Retrieves a stored response by its ID.
+ * The response ID maps to a conversationId in LibreChat's storage.
+ *
+ * @param {import('express').Request} req
+ * @param {import('express').Response} res
+ */
+const getResponse = async (req, res) => {
+  try {
+    const responseId = req.params.id;
+    const userId = req.user?.id;
+
+    if (!responseId) {
+      return sendResponsesErrorResponse(res, 400, 'Response ID is required');
+    }
+
+    // The responseId could be either the response ID or the conversation ID
+    // Try to find a conversation with this ID
+    const conversation = await getConvo(userId, responseId);
+
+    if (!conversation) {
+      return sendResponsesErrorResponse(
+        res,
+        404,
+        `Response not found: ${responseId}`,
+        'not_found',
+        'response_not_found',
+      );
+    }
+
+    // Load messages for this conversation
+    const messages = await db.getMessages({ conversationId: responseId, user: userId });
+
+    if (!messages || messages.length === 0) {
+      return sendResponsesErrorResponse(
+        res,
+        404,
+        `No messages found for response: ${responseId}`,
+        'not_found',
+        'response_not_found',
+      );
+    }
+
+    // Convert messages to Open Responses output format
+    const output = convertMessagesToOutputItems(messages);
+
+    // Find the last assistant message for usage info
+    const lastAssistantMessage = messages.filter((m) => !m.isCreatedByUser).pop();
+
+    // Build the response object
+    const response = {
+      id: responseId,
+      object: 'response',
+      created_at: Math.floor(new Date(conversation.createdAt || Date.now()).getTime() / 1000),
+      completed_at: Math.floor(new Date(conversation.updatedAt || Date.now()).getTime() / 1000),
+      status: 'completed',
+      incomplete_details: null,
+      model: conversation.agentId || conversation.model || 'unknown',
+      previous_response_id: null,
+      instructions: null,
+      output,
+      error: null,
+      tools: [],
+      tool_choice: 'auto',
+      truncation: 'disabled',
+      parallel_tool_calls: true,
+      text: { format: { type: 'text' } },
+      temperature: 1,
+      top_p: 1,
+      presence_penalty: 0,
+      frequency_penalty: 0,
+      top_logprobs: null,
+      reasoning: null,
+      user: userId,
+      usage: lastAssistantMessage?.tokenCount
+        ? {
+            input_tokens: 0,
+            output_tokens: lastAssistantMessage.tokenCount,
+            total_tokens: lastAssistantMessage.tokenCount,
+          }
+        : null,
+      max_output_tokens: null,
+      max_tool_calls: null,
+      store: true,
+      background: false,
+      service_tier: 'default',
+      metadata: {},
+      safety_identifier: null,
+      prompt_cache_key: null,
+    };
+
+    res.json(response);
+  } catch (error) {
+    logger.error('[Responses API] Error getting response:', error);
+    sendResponsesErrorResponse(
+      res,
+      500,
+      error instanceof Error ? error.message : 'Failed to get response',
+      'server_error',
+    );
+  }
+};
+
+module.exports = {
+  createResponse,
+  getResponse,
+  listModels,
+  setAppConfig,
+};
diff --git a/api/server/controllers/agents/v1.js b/api/server/controllers/agents/v1.js
index 9f0a4a2279..34078b2250 100644
--- a/api/server/controllers/agents/v1.js
+++ b/api/server/controllers/agents/v1.js
@@ -11,7 +11,9 @@ const {
   convertOcrToContextInPlace,
 } = require('@librechat/api');
 const {
+  Time,
   Tools,
+  CacheKeys,
   Constants,
   FileSources,
   ResourceType,
@@ -21,8 +23,6 @@ const {
   PermissionBits,
   actionDelimiter,
   removeNullishValues,
-  CacheKeys,
-  Time,
 } = require('librechat-data-provider');
 const {
   getListAgentsByAccess,
@@ -94,16 +94,25 @@ const createAgentHandler = async (req, res) => {
 
     const agent = await createAgent(agentData);
 
-    // Automatically grant owner permissions to the creator
     try {
-      await grantPermission({
-        principalType: PrincipalType.USER,
-        principalId: userId,
-        resourceType: ResourceType.AGENT,
-        resourceId: agent._id,
-        accessRoleId: AccessRoleIds.AGENT_OWNER,
-        grantedBy: userId,
-      });
+      await Promise.all([
+        grantPermission({
+          principalType: PrincipalType.USER,
+          principalId: userId,
+          resourceType: ResourceType.AGENT,
+          resourceId: agent._id,
+          accessRoleId: AccessRoleIds.AGENT_OWNER,
+          grantedBy: userId,
+        }),
+        grantPermission({
+          principalType: PrincipalType.USER,
+          principalId: userId,
+          resourceType: ResourceType.REMOTE_AGENT,
+          resourceId: agent._id,
+          accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+          grantedBy: userId,
+        }),
+      ]);
       logger.debug(
         `[createAgent] Granted owner permissions to user ${userId} for agent ${agent.id}`,
       );
@@ -396,16 +405,25 @@ const duplicateAgentHandler = async (req, res) => {
     newAgentData.actions = agentActions;
     const newAgent = await createAgent(newAgentData);
 
-    // Automatically grant owner permissions to the duplicator
     try {
-      await grantPermission({
-        principalType: PrincipalType.USER,
-        principalId: userId,
-        resourceType: ResourceType.AGENT,
-        resourceId: newAgent._id,
-        accessRoleId: AccessRoleIds.AGENT_OWNER,
-        grantedBy: userId,
-      });
+      await Promise.all([
+        grantPermission({
+          principalType: PrincipalType.USER,
+          principalId: userId,
+          resourceType: ResourceType.AGENT,
+          resourceId: newAgent._id,
+          accessRoleId: AccessRoleIds.AGENT_OWNER,
+          grantedBy: userId,
+        }),
+        grantPermission({
+          principalType: PrincipalType.USER,
+          principalId: userId,
+          resourceType: ResourceType.REMOTE_AGENT,
+          resourceId: newAgent._id,
+          accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+          grantedBy: userId,
+        }),
+      ]);
       logger.debug(
         `[duplicateAgent] Granted owner permissions to user ${userId} for duplicated agent ${newAgent.id}`,
       );
diff --git a/api/server/controllers/auth/LogoutController.js b/api/server/controllers/auth/LogoutController.js
index ec66316285..0b3cf262b8 100644
--- a/api/server/controllers/auth/LogoutController.js
+++ b/api/server/controllers/auth/LogoutController.js
@@ -22,6 +22,7 @@ const logoutController = async (req, res) => {
 
     res.clearCookie('refreshToken');
     res.clearCookie('openid_access_token');
+    res.clearCookie('openid_id_token');
     res.clearCookie('openid_user_id');
     res.clearCookie('token_provider');
     const response = { message };
diff --git a/api/server/controllers/auth/oauth.js b/api/server/controllers/auth/oauth.js
new file mode 100644
index 0000000000..80c2ced002
--- /dev/null
+++ b/api/server/controllers/auth/oauth.js
@@ -0,0 +1,79 @@
+const { CacheKeys } = require('librechat-data-provider');
+const { logger, DEFAULT_SESSION_EXPIRY } = require('@librechat/data-schemas');
+const {
+  isEnabled,
+  getAdminPanelUrl,
+  isAdminPanelRedirect,
+  generateAdminExchangeCode,
+} = require('@librechat/api');
+const { syncUserEntraGroupMemberships } = require('~/server/services/PermissionService');
+const { setAuthTokens, setOpenIDAuthTokens } = require('~/server/services/AuthService');
+const getLogStores = require('~/cache/getLogStores');
+const { checkBan } = require('~/server/middleware');
+const { generateToken } = require('~/models');
+
+const domains = {
+  client: process.env.DOMAIN_CLIENT,
+  server: process.env.DOMAIN_SERVER,
+};
+
+function createOAuthHandler(redirectUri = domains.client) {
+  /**
+   * A handler to process OAuth authentication results.
+   * @type {Function}
+   * @param {ServerRequest} req - Express request object.
+   * @param {ServerResponse} res - Express response object.
+   * @param {NextFunction} next - Express next middleware function.
+   */
+  return async (req, res, next) => {
+    try {
+      if (res.headersSent) {
+        return;
+      }
+
+      await checkBan(req, res);
+      if (req.banned) {
+        return;
+      }
+
+      /** Check if this is an admin panel redirect (cross-origin) */
+      if (isAdminPanelRedirect(redirectUri, getAdminPanelUrl(), domains.client)) {
+        /** For admin panel, generate exchange code instead of setting cookies */
+        const cache = getLogStores(CacheKeys.ADMIN_OAUTH_EXCHANGE);
+        const sessionExpiry = Number(process.env.SESSION_EXPIRY) || DEFAULT_SESSION_EXPIRY;
+        const token = await generateToken(req.user, sessionExpiry);
+
+        /** Get refresh token from tokenset for OpenID users */
+        const refreshToken =
+          req.user.tokenset?.refresh_token || req.user.federatedTokens?.refresh_token;
+
+        const exchangeCode = await generateAdminExchangeCode(cache, req.user, token, refreshToken);
+
+        const callbackUrl = new URL(redirectUri);
+        callbackUrl.searchParams.set('code', exchangeCode);
+        logger.info(`[OAuth] Admin panel redirect with exchange code for user: ${req.user.email}`);
+        return res.redirect(callbackUrl.toString());
+      }
+
+      /** Standard OAuth flow - set cookies and redirect */
+      if (
+        req.user &&
+        req.user.provider == 'openid' &&
+        isEnabled(process.env.OPENID_REUSE_TOKENS) === true
+      ) {
+        await syncUserEntraGroupMemberships(req.user, req.user.tokenset.access_token);
+        setOpenIDAuthTokens(req.user.tokenset, req, res, req.user._id.toString());
+      } else {
+        await setAuthTokens(req.user._id, res);
+      }
+      res.redirect(redirectUri);
+    } catch (err) {
+      logger.error('Error in setting authentication tokens:', err);
+      next(err);
+    }
+  };
+}
+
+module.exports = {
+  createOAuthHandler,
+};
diff --git a/api/server/experimental.js b/api/server/experimental.js
index 91ef9ef286..4a457abf61 100644
--- a/api/server/experimental.js
+++ b/api/server/experimental.js
@@ -299,6 +299,7 @@ if (cluster.isMaster) {
     app.use('/api/auth', routes.auth);
     app.use('/api/actions', routes.actions);
     app.use('/api/keys', routes.keys);
+    app.use('/api/api-keys', routes.apiKeys);
     app.use('/api/user', routes.user);
     app.use('/api/search', routes.search);
     app.use('/api/messages', routes.messages);
diff --git a/api/server/index.js b/api/server/index.js
index a7ddd47f37..193eb423ad 100644
--- a/api/server/index.js
+++ b/api/server/index.js
@@ -134,8 +134,10 @@ const startServer = async () => {
   app.use('/oauth', routes.oauth);
   /* API Endpoints */
   app.use('/api/auth', routes.auth);
+  app.use('/api/admin', routes.adminAuth);
   app.use('/api/actions', routes.actions);
   app.use('/api/keys', routes.keys);
+  app.use('/api/api-keys', routes.apiKeys);
   app.use('/api/user', routes.user);
   app.use('/api/search', routes.search);
   app.use('/api/messages', routes.messages);
@@ -249,6 +251,15 @@ process.on('uncaughtException', (err) => {
     return;
   }
 
+  if (isEnabled(process.env.CONTINUE_ON_UNCAUGHT_EXCEPTION)) {
+    logger.error('Unhandled error encountered. The app will continue running.', {
+      name: err?.name,
+      message: err?.message,
+      stack: err?.stack,
+    });
+    return;
+  }
+
   process.exit(1);
 });
 
diff --git a/api/server/middleware/abortMiddleware.js b/api/server/middleware/abortMiddleware.js
index b85f1439cc..d07a09682d 100644
--- a/api/server/middleware/abortMiddleware.js
+++ b/api/server/middleware/abortMiddleware.js
@@ -7,13 +7,89 @@ const {
   sanitizeMessageForTransmit,
 } = require('@librechat/api');
 const { isAssistantsEndpoint, ErrorTypes } = require('librechat-data-provider');
+const { spendTokens, spendStructuredTokens } = require('~/models/spendTokens');
 const { truncateText, smartTruncateText } = require('~/app/clients/prompts');
 const clearPendingReq = require('~/cache/clearPendingReq');
 const { sendError } = require('~/server/middleware/error');
-const { spendTokens } = require('~/models/spendTokens');
 const { saveMessage, getConvo } = require('~/models');
 const { abortRun } = require('./abortRun');
 
+/**
+ * Spend tokens for all models from collected usage.
+ * This handles both sequential and parallel agent execution.
+ *
+ * IMPORTANT: After spending, this function clears the collectedUsage array
+ * to prevent double-spending. The array is shared with AgentClient.collectedUsage,
+ * so clearing it here prevents the finally block from also spending tokens.
+ *
+ * @param {Object} params
+ * @param {string} params.userId - User ID
+ * @param {string} params.conversationId - Conversation ID
+ * @param {Array<Object>} params.collectedUsage - Usage metadata from all models
+ * @param {string} [params.fallbackModel] - Fallback model name if not in usage
+ */
+async function spendCollectedUsage({ userId, conversationId, collectedUsage, fallbackModel }) {
+  if (!collectedUsage || collectedUsage.length === 0) {
+    return;
+  }
+
+  const spendPromises = [];
+
+  for (const usage of collectedUsage) {
+    if (!usage) {
+      continue;
+    }
+
+    // Support both OpenAI format (input_token_details) and Anthropic format (cache_*_input_tokens)
+    const cache_creation =
+      Number(usage.input_token_details?.cache_creation) ||
+      Number(usage.cache_creation_input_tokens) ||
+      0;
+    const cache_read =
+      Number(usage.input_token_details?.cache_read) || Number(usage.cache_read_input_tokens) || 0;
+
+    const txMetadata = {
+      context: 'abort',
+      conversationId,
+      user: userId,
+      model: usage.model ?? fallbackModel,
+    };
+
+    if (cache_creation > 0 || cache_read > 0) {
+      spendPromises.push(
+        spendStructuredTokens(txMetadata, {
+          promptTokens: {
+            input: usage.input_tokens,
+            write: cache_creation,
+            read: cache_read,
+          },
+          completionTokens: usage.output_tokens,
+        }).catch((err) => {
+          logger.error('[abortMiddleware] Error spending structured tokens for abort', err);
+        }),
+      );
+      continue;
+    }
+
+    spendPromises.push(
+      spendTokens(txMetadata, {
+        promptTokens: usage.input_tokens,
+        completionTokens: usage.output_tokens,
+      }).catch((err) => {
+        logger.error('[abortMiddleware] Error spending tokens for abort', err);
+      }),
+    );
+  }
+
+  // Wait for all token spending to complete
+  await Promise.all(spendPromises);
+
+  // Clear the array to prevent double-spending from the AgentClient finally block.
+  // The collectedUsage array is shared by reference with AgentClient.collectedUsage,
+  // so clearing it here ensures recordCollectedUsage() sees an empty array and returns early.
+  collectedUsage.length = 0;
+}
+
 /**
  * Abort an active message generation.
  * Uses GenerationJobManager for all agent requests.
@@ -39,9 +115,8 @@ async function abortMessage(req, res) {
     return;
   }
 
-  const { jobData, content, text } = abortResult;
+  const { jobData, content, text, collectedUsage } = abortResult;
 
-  // Count tokens and spend them
   const completionTokens = await countTokens(text);
   const promptTokens = jobData?.promptTokens ?? 0;
 
@@ -62,10 +137,21 @@ async function abortMessage(req, res) {
     tokenCount: completionTokens,
   };
 
-  await spendTokens(
-    { ...responseMessage, context: 'incomplete', user: userId },
-    { promptTokens, completionTokens },
-  );
+  // Spend tokens for ALL models from collectedUsage (handles parallel agents/addedConvo)
+  if (collectedUsage && collectedUsage.length > 0) {
+    await spendCollectedUsage({
+      userId,
+      conversationId: jobData?.conversationId,
+      collectedUsage,
+      fallbackModel: jobData?.model,
+    });
+  } else {
+    // Fallback: no collected usage, use text-based token counting for primary model only
+    await spendTokens(
+      { ...responseMessage, context: 'incomplete', user: userId },
+      { promptTokens, completionTokens },
+    );
+  }
 
   await saveMessage(
     req,
diff --git a/api/server/middleware/abortMiddleware.spec.js b/api/server/middleware/abortMiddleware.spec.js
new file mode 100644
index 0000000000..93f2ce558b
--- /dev/null
+++ b/api/server/middleware/abortMiddleware.spec.js
@@ -0,0 +1,428 @@
+/**
+ * Tests for abortMiddleware - spendCollectedUsage function
+ *
+ * This tests the token spending logic for abort scenarios,
+ * particularly for parallel agents (addedConvo) where multiple
+ * models need their tokens spent.
+ */
+
+const mockSpendTokens = jest.fn().mockResolvedValue();
+const mockSpendStructuredTokens = jest.fn().mockResolvedValue();
+
+jest.mock('~/models/spendTokens', () => ({
+  spendTokens: (...args) => mockSpendTokens(...args),
+  spendStructuredTokens: (...args) => mockSpendStructuredTokens(...args),
+}));
+
+jest.mock('@librechat/data-schemas', () => ({
+  logger: {
+    debug: jest.fn(),
+    error: jest.fn(),
+    warn: jest.fn(),
+    info: jest.fn(),
+  },
+}));
+
+jest.mock('@librechat/api', () => ({
+  countTokens: jest.fn().mockResolvedValue(100),
+  isEnabled: jest.fn().mockReturnValue(false),
+  sendEvent: jest.fn(),
+  GenerationJobManager: {
+    abortJob: jest.fn(),
+  },
+  sanitizeMessageForTransmit: jest.fn((msg) => msg),
+}));
+
+jest.mock('librechat-data-provider', () => ({
+  isAssistantsEndpoint: jest.fn().mockReturnValue(false),
+  ErrorTypes: { INVALID_REQUEST: 'INVALID_REQUEST', NO_SYSTEM_MESSAGES: 'NO_SYSTEM_MESSAGES' },
+}));
+
+jest.mock('~/app/clients/prompts', () => ({
+  truncateText: jest.fn((text) => text),
+  smartTruncateText: jest.fn((text) => text),
+}));
+
+jest.mock('~/cache/clearPendingReq', () => jest.fn().mockResolvedValue());
+
+jest.mock('~/server/middleware/error', () => ({
+  sendError: jest.fn(),
+}));
+
+jest.mock('~/models', () => ({
+  saveMessage: jest.fn().mockResolvedValue(),
+  getConvo: jest.fn().mockResolvedValue({ title: 'Test Chat' }),
+}));
+
+jest.mock('./abortRun', () => ({
+  abortRun: jest.fn(),
+}));
+
+// Import the module after mocks are set up
+// We need to extract the spendCollectedUsage function for testing
+// Since it's not exported, we'll test it through the handleAbort flow
+
+describe('abortMiddleware - spendCollectedUsage', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('spendCollectedUsage logic', () => {
+    // Since spendCollectedUsage is not exported, we test the logic directly
+    // by replicating the function here for unit testing
+
+    const spendCollectedUsage = async ({
+      userId,
+      conversationId,
+      collectedUsage,
+      fallbackModel,
+    }) => {
+      if (!collectedUsage || collectedUsage.length === 0) {
+        return;
+      }
+
+      const spendPromises = [];
+
+      for (const usage of collectedUsage) {
+        if (!usage) {
+          continue;
+        }
+
+        const cache_creation =
+          Number(usage.input_token_details?.cache_creation) ||
+          Number(usage.cache_creation_input_tokens) ||
+          0;
+        const cache_read =
+          Number(usage.input_token_details?.cache_read) ||
+          Number(usage.cache_read_input_tokens) ||
+          0;
+
+        const txMetadata = {
+          context: 'abort',
+          conversationId,
+          user: userId,
+          model: usage.model ?? fallbackModel,
+        };
+
+        if (cache_creation > 0 || cache_read > 0) {
+          spendPromises.push(
+            mockSpendStructuredTokens(txMetadata, {
+              promptTokens: {
+                input: usage.input_tokens,
+                write: cache_creation,
+                read: cache_read,
+              },
+              completionTokens: usage.output_tokens,
+            }).catch(() => {
+              // Log error but don't throw
+            }),
+          );
+          continue;
+        }
+
+        spendPromises.push(
+          mockSpendTokens(txMetadata, {
+            promptTokens: usage.input_tokens,
+            completionTokens: usage.output_tokens,
+          }).catch(() => {
+            // Log error but don't throw
+          }),
+        );
+      }
+
+      // Wait for all token spending to complete
+      await Promise.all(spendPromises);
+
+      // Clear the array to prevent double-spending
+      collectedUsage.length = 0;
+    };
+
+    it('should return early if collectedUsage is empty', async () => {
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage: [],
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+      expect(mockSpendStructuredTokens).not.toHaveBeenCalled();
+    });
+
+    it('should return early if collectedUsage is null', async () => {
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage: null,
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+      expect(mockSpendStructuredTokens).not.toHaveBeenCalled();
+    });
+
+    it('should skip null entries in collectedUsage', async () => {
+      const collectedUsage = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        null,
+        { input_tokens: 200, output_tokens: 60, model: 'gpt-4' },
+      ];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(2);
+    });
+
+    it('should spend tokens for single model', async () => {
+      const collectedUsage = [{ input_tokens: 100, output_tokens: 50, model: 'gpt-4' }];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(1);
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        expect.objectContaining({
+          context: 'abort',
+          conversationId: 'convo-123',
+          user: 'user-123',
+          model: 'gpt-4',
+        }),
+        { promptTokens: 100, completionTokens: 50 },
+      );
+    });
+
+    it('should spend tokens for multiple models (parallel agents)', async () => {
+      const collectedUsage = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+        { input_tokens: 120, output_tokens: 60, model: 'gemini-pro' },
+      ];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(3);
+
+      // Verify each model was called
+      expect(mockSpendTokens).toHaveBeenNthCalledWith(
+        1,
+        expect.objectContaining({ model: 'gpt-4' }),
+        { promptTokens: 100, completionTokens: 50 },
+      );
+      expect(mockSpendTokens).toHaveBeenNthCalledWith(
+        2,
+        expect.objectContaining({ model: 'claude-3' }),
+        { promptTokens: 80, completionTokens: 40 },
+      );
+      expect(mockSpendTokens).toHaveBeenNthCalledWith(
+        3,
+        expect.objectContaining({ model: 'gemini-pro' }),
+        { promptTokens: 120, completionTokens: 60 },
+      );
+    });
+
+    it('should use fallbackModel when usage.model is missing', async () => {
+      const collectedUsage = [{ input_tokens: 100, output_tokens: 50 }];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'fallback-model',
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ model: 'fallback-model' }),
+        expect.any(Object),
+      );
+    });
+
+    it('should use spendStructuredTokens for OpenAI format cache tokens', async () => {
+      const collectedUsage = [
+        {
+          input_tokens: 100,
+          output_tokens: 50,
+          model: 'gpt-4',
+          input_token_details: {
+            cache_creation: 20,
+            cache_read: 10,
+          },
+        },
+      ];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendStructuredTokens).toHaveBeenCalledTimes(1);
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+      expect(mockSpendStructuredTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ model: 'gpt-4', context: 'abort' }),
+        {
+          promptTokens: {
+            input: 100,
+            write: 20,
+            read: 10,
+          },
+          completionTokens: 50,
+        },
+      );
+    });
+
+    it('should use spendStructuredTokens for Anthropic format cache tokens', async () => {
+      const collectedUsage = [
+        {
+          input_tokens: 100,
+          output_tokens: 50,
+          model: 'claude-3',
+          cache_creation_input_tokens: 25,
+          cache_read_input_tokens: 15,
+        },
+      ];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'claude-3',
+      });
+
+      expect(mockSpendStructuredTokens).toHaveBeenCalledTimes(1);
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+      expect(mockSpendStructuredTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ model: 'claude-3' }),
+        {
+          promptTokens: {
+            input: 100,
+            write: 25,
+            read: 15,
+          },
+          completionTokens: 50,
+        },
+      );
+    });
+
+    it('should handle mixed cache and non-cache entries', async () => {
+      const collectedUsage = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        {
+          input_tokens: 150,
+          output_tokens: 30,
+          model: 'claude-3',
+          cache_creation_input_tokens: 20,
+          cache_read_input_tokens: 10,
+        },
+        { input_tokens: 200, output_tokens: 20, model: 'gemini-pro' },
+      ];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(2);
+      expect(mockSpendStructuredTokens).toHaveBeenCalledTimes(1);
+    });
+
+    it('should handle real-world parallel agent abort scenario', async () => {
+      // Simulates: Primary agent (gemini) + addedConvo agent (gpt-5) aborted mid-stream
+      const collectedUsage = [
+        { input_tokens: 31596, output_tokens: 151, model: 'gemini-3-flash-preview' },
+        { input_tokens: 28000, output_tokens: 120, model: 'gpt-5.2' },
+      ];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gemini-3-flash-preview',
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(2);
+
+      // Primary model
+      expect(mockSpendTokens).toHaveBeenNthCalledWith(
+        1,
+        expect.objectContaining({ model: 'gemini-3-flash-preview' }),
+        { promptTokens: 31596, completionTokens: 151 },
+      );
+
+      // Parallel model (addedConvo)
+      expect(mockSpendTokens).toHaveBeenNthCalledWith(
+        2,
+        expect.objectContaining({ model: 'gpt-5.2' }),
+        { promptTokens: 28000, completionTokens: 120 },
+      );
+    });
+
+    it('should clear collectedUsage array after spending to prevent double-spending', async () => {
+      // This tests the race condition fix: after abort middleware spends tokens,
+      // the collectedUsage array is cleared so AgentClient.recordCollectedUsage()
+      // (which shares the same array reference) sees an empty array and returns early.
+      const collectedUsage = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+      ];
+
+      expect(collectedUsage.length).toBe(2);
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gpt-4',
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(2);
+
+      // The array should be cleared after spending
+      expect(collectedUsage.length).toBe(0);
+    });
+
+    it('should await all token spending operations before clearing array', async () => {
+      // Ensure we don't clear the array before spending completes
+      let spendCallCount = 0;
+      mockSpendTokens.mockImplementation(async () => {
+        spendCallCount++;
+        // Simulate async delay
+        await new Promise((resolve) => setTimeout(resolve, 10));
+      });
+
+      const collectedUsage = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+      ];
+
+      await spendCollectedUsage({
+        userId: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+        fallbackModel: 'gpt-4',
+      });
+
+      // Both spend calls should have completed
+      expect(spendCallCount).toBe(2);
+
+      // Array should be cleared after awaiting
+      expect(collectedUsage.length).toBe(0);
+    });
+  });
+});
diff --git a/api/server/middleware/buildEndpointOption.js b/api/server/middleware/buildEndpointOption.js
index f56d850120..64ed8e7466 100644
--- a/api/server/middleware/buildEndpointOption.js
+++ b/api/server/middleware/buildEndpointOption.js
@@ -5,9 +5,11 @@ const {
   EModelEndpoint,
   isAgentsEndpoint,
   parseCompactConvo,
+  getDefaultParamsEndpoint,
 } = require('librechat-data-provider');
 const azureAssistants = require('~/server/services/Endpoints/azureAssistants');
 const assistants = require('~/server/services/Endpoints/assistants');
+const { getEndpointsConfig } = require('~/server/services/Config');
 const agents = require('~/server/services/Endpoints/agents');
 const { updateFilesUsage } = require('~/models');
 
@@ -19,9 +21,24 @@ const buildFunction = {
 
 async function buildEndpointOption(req, res, next) {
   const { endpoint, endpointType } = req.body;
+
+  let endpointsConfig;
+  try {
+    endpointsConfig = await getEndpointsConfig(req);
+  } catch (error) {
+    logger.error('Error fetching endpoints config in buildEndpointOption', error);
+  }
+
+  const defaultParamsEndpoint = getDefaultParamsEndpoint(endpointsConfig, endpoint);
+
   let parsedBody;
   try {
-    parsedBody = parseCompactConvo({ endpoint, endpointType, conversation: req.body });
+    parsedBody = parseCompactConvo({
+      endpoint,
+      endpointType,
+      conversation: req.body,
+      defaultParamsEndpoint,
+    });
   } catch (error) {
     logger.error(`Error parsing compact conversation for endpoint ${endpoint}`, error);
     logger.debug({
@@ -55,6 +72,7 @@ async function buildEndpointOption(req, res, next) {
         endpoint,
         endpointType,
         conversation: currentModelSpec.preset,
+        defaultParamsEndpoint,
       });
       if (currentModelSpec.iconURL != null && currentModelSpec.iconURL !== '') {
         parsedBody.iconURL = currentModelSpec.iconURL;
diff --git a/api/server/middleware/buildEndpointOption.spec.js b/api/server/middleware/buildEndpointOption.spec.js
new file mode 100644
index 0000000000..eab5e2666b
--- /dev/null
+++ b/api/server/middleware/buildEndpointOption.spec.js
@@ -0,0 +1,237 @@
+/**
+ * Wrap parseCompactConvo: the REAL function runs, but jest can observe
+ * calls and return values. Must be declared before require('./buildEndpointOption')
+ * so the destructured reference in the middleware captures the wrapper.
+ */
+jest.mock('librechat-data-provider', () => {
+  const actual = jest.requireActual('librechat-data-provider');
+  return {
+    ...actual,
+    parseCompactConvo: jest.fn((...args) => actual.parseCompactConvo(...args)),
+  };
+});
+
+const { EModelEndpoint, parseCompactConvo } = require('librechat-data-provider');
+
+const mockBuildOptions = jest.fn((_endpoint, parsedBody) => ({
+  ...parsedBody,
+  endpoint: _endpoint,
+}));
+
+jest.mock('~/server/services/Endpoints/azureAssistants', () => ({
+  buildOptions: mockBuildOptions,
+}));
+jest.mock('~/server/services/Endpoints/assistants', () => ({
+  buildOptions: mockBuildOptions,
+}));
+jest.mock('~/server/services/Endpoints/agents', () => ({
+  buildOptions: mockBuildOptions,
+}));
+
+jest.mock('~/models', () => ({
+  updateFilesUsage: jest.fn(),
+}));
+
+const mockGetEndpointsConfig = jest.fn();
+jest.mock('~/server/services/Config', () => ({
+  getEndpointsConfig: (...args) => mockGetEndpointsConfig(...args),
+}));
+
+jest.mock('@librechat/api', () => ({
+  handleError: jest.fn(),
+}));
+
+const buildEndpointOption = require('./buildEndpointOption');
+
+const createReq = (body, config = {}) => ({
+  body,
+  config,
+  baseUrl: '/api/chat',
+});
+
+const createRes = () => ({
+  status: jest.fn().mockReturnThis(),
+  json: jest.fn().mockReturnThis(),
+});
+
+describe('buildEndpointOption - defaultParamsEndpoint parsing', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should pass defaultParamsEndpoint to parseCompactConvo and preserve maxOutputTokens', async () => {
+    mockGetEndpointsConfig.mockResolvedValue({
+      AnthropicClaude: {
+        type: EModelEndpoint.custom,
+        customParams: {
+          defaultParamsEndpoint: EModelEndpoint.anthropic,
+        },
+      },
+    });
+
+    const req = createReq(
+      {
+        endpoint: 'AnthropicClaude',
+        endpointType: EModelEndpoint.custom,
+        model: 'anthropic/claude-opus-4.5',
+        temperature: 0.7,
+        maxOutputTokens: 8192,
+        topP: 0.9,
+        maxContextTokens: 50000,
+      },
+      { modelSpecs: null },
+    );
+
+    await buildEndpointOption(req, createRes(), jest.fn());
+
+    expect(parseCompactConvo).toHaveBeenCalledWith(
+      expect.objectContaining({
+        defaultParamsEndpoint: EModelEndpoint.anthropic,
+      }),
+    );
+
+    const parsedResult = parseCompactConvo.mock.results[0].value;
+    expect(parsedResult.maxOutputTokens).toBe(8192);
+    expect(parsedResult.topP).toBe(0.9);
+    expect(parsedResult.temperature).toBe(0.7);
+    expect(parsedResult.maxContextTokens).toBe(50000);
+  });
+
+  it('should strip maxOutputTokens when no defaultParamsEndpoint is configured', async () => {
+    mockGetEndpointsConfig.mockResolvedValue({
+      MyOpenRouter: {
+        type: EModelEndpoint.custom,
+      },
+    });
+
+    const req = createReq(
+      {
+        endpoint: 'MyOpenRouter',
+        endpointType: EModelEndpoint.custom,
+        model: 'gpt-4o',
+        temperature: 0.7,
+        maxOutputTokens: 8192,
+        max_tokens: 4096,
+      },
+      { modelSpecs: null },
+    );
+
+    await buildEndpointOption(req, createRes(), jest.fn());
+
+    expect(parseCompactConvo).toHaveBeenCalledWith(
+      expect.objectContaining({
+        defaultParamsEndpoint: undefined,
+      }),
+    );
+
+    const parsedResult = parseCompactConvo.mock.results[0].value;
+    expect(parsedResult.maxOutputTokens).toBeUndefined();
+    expect(parsedResult.max_tokens).toBe(4096);
+    expect(parsedResult.temperature).toBe(0.7);
+  });
+
+  it('should strip bedrock region from custom endpoint without defaultParamsEndpoint', async () => {
+    mockGetEndpointsConfig.mockResolvedValue({
+      MyEndpoint: {
+        type: EModelEndpoint.custom,
+      },
+    });
+
+    const req = createReq(
+      {
+        endpoint: 'MyEndpoint',
+        endpointType: EModelEndpoint.custom,
+        model: 'gpt-4o',
+        temperature: 0.7,
+        region: 'us-east-1',
+      },
+      { modelSpecs: null },
+    );
+
+    await buildEndpointOption(req, createRes(), jest.fn());
+
+    const parsedResult = parseCompactConvo.mock.results[0].value;
+    expect(parsedResult.region).toBeUndefined();
+    expect(parsedResult.temperature).toBe(0.7);
+  });
+
+  it('should pass defaultParamsEndpoint when re-parsing enforced model spec', async () => {
+    mockGetEndpointsConfig.mockResolvedValue({
+      AnthropicClaude: {
+        type: EModelEndpoint.custom,
+        customParams: {
+          defaultParamsEndpoint: EModelEndpoint.anthropic,
+        },
+      },
+    });
+
+    const modelSpec = {
+      name: 'claude-opus-4.5',
+      preset: {
+        endpoint: 'AnthropicClaude',
+        endpointType: EModelEndpoint.custom,
+        model: 'anthropic/claude-opus-4.5',
+        temperature: 0.7,
+        maxOutputTokens: 8192,
+        maxContextTokens: 50000,
+      },
+    };
+
+    const req = createReq(
+      {
+        endpoint: 'AnthropicClaude',
+        endpointType: EModelEndpoint.custom,
+        spec: 'claude-opus-4.5',
+        model: 'anthropic/claude-opus-4.5',
+      },
+      {
+        modelSpecs: {
+          enforce: true,
+          list: [modelSpec],
+        },
+      },
+    );
+
+    await buildEndpointOption(req, createRes(), jest.fn());
+
+    const enforcedCall = parseCompactConvo.mock.calls[1];
+    expect(enforcedCall[0]).toEqual(
+      expect.objectContaining({
+        defaultParamsEndpoint: EModelEndpoint.anthropic,
+      }),
+    );
+
+    const enforcedResult = parseCompactConvo.mock.results[1].value;
+    expect(enforcedResult.maxOutputTokens).toBe(8192);
+    expect(enforcedResult.temperature).toBe(0.7);
+    expect(enforcedResult.maxContextTokens).toBe(50000);
+  });
+
+  it('should fall back to OpenAI schema when getEndpointsConfig fails', async () => {
+    mockGetEndpointsConfig.mockRejectedValue(new Error('Config unavailable'));
+
+    const req = createReq(
+      {
+        endpoint: 'AnthropicClaude',
+        endpointType: EModelEndpoint.custom,
+        model: 'anthropic/claude-opus-4.5',
+        temperature: 0.7,
+        maxOutputTokens: 8192,
+        max_tokens: 4096,
+      },
+      { modelSpecs: null },
+    );
+
+    await buildEndpointOption(req, createRes(), jest.fn());
+
+    expect(parseCompactConvo).toHaveBeenCalledWith(
+      expect.objectContaining({
+        defaultParamsEndpoint: undefined,
+      }),
+    );
+
+    const parsedResult = parseCompactConvo.mock.results[0].value;
+    expect(parsedResult.maxOutputTokens).toBeUndefined();
+    expect(parsedResult.max_tokens).toBe(4096);
+  });
+});
diff --git a/api/server/middleware/checkSharePublicAccess.js b/api/server/middleware/checkSharePublicAccess.js
index c094d54acb..0e95b9f6f8 100644
--- a/api/server/middleware/checkSharePublicAccess.js
+++ b/api/server/middleware/checkSharePublicAccess.js
@@ -9,6 +9,7 @@ const resourceToPermissionType = {
   [ResourceType.AGENT]: PermissionTypes.AGENTS,
   [ResourceType.PROMPTGROUP]: PermissionTypes.PROMPTS,
   [ResourceType.MCPSERVER]: PermissionTypes.MCP_SERVERS,
+  [ResourceType.REMOTE_AGENT]: PermissionTypes.REMOTE_AGENTS,
 };
 
 /**
diff --git a/api/server/middleware/requireJwtAuth.js b/api/server/middleware/requireJwtAuth.js
index ed83c4773e..16b107aefc 100644
--- a/api/server/middleware/requireJwtAuth.js
+++ b/api/server/middleware/requireJwtAuth.js
@@ -7,16 +7,13 @@ const { isEnabled } = require('@librechat/api');
  * Switches between JWT and OpenID authentication based on cookies and environment settings
  */
 const requireJwtAuth = (req, res, next) => {
-  // Check if token provider is specified in cookies
   const cookieHeader = req.headers.cookie;
   const tokenProvider = cookieHeader ? cookies.parse(cookieHeader).token_provider : null;
 
-  // Use OpenID authentication if token provider is OpenID and OPENID_REUSE_TOKENS is enabled
   if (tokenProvider === 'openid' && isEnabled(process.env.OPENID_REUSE_TOKENS)) {
     return passport.authenticate('openidJwt', { session: false })(req, res, next);
   }
 
-  // Default to standard JWT authentication
   return passport.authenticate('jwt', { session: false })(req, res, next);
 };
 
diff --git a/api/server/routes/__tests__/convos.spec.js b/api/server/routes/__tests__/convos.spec.js
index ef11b3cbbb..931ef006d0 100644
--- a/api/server/routes/__tests__/convos.spec.js
+++ b/api/server/routes/__tests__/convos.spec.js
@@ -385,6 +385,40 @@ describe('Convos Routes', () => {
       expect(deleteConvoSharedLink).not.toHaveBeenCalled();
     });
 
+    it('should return 400 when request body is empty (DoS prevention)', async () => {
+      const response = await request(app).delete('/api/convos').send({});
+
+      expect(response.status).toBe(400);
+      expect(response.body).toEqual({ error: 'no parameters provided' });
+      expect(deleteConvos).not.toHaveBeenCalled();
+    });
+
+    it('should return 400 when arg is null (DoS prevention)', async () => {
+      const response = await request(app).delete('/api/convos').send({ arg: null });
+
+      expect(response.status).toBe(400);
+      expect(response.body).toEqual({ error: 'no parameters provided' });
+      expect(deleteConvos).not.toHaveBeenCalled();
+    });
+
+    it('should return 400 when arg is undefined (DoS prevention)', async () => {
+      const response = await request(app).delete('/api/convos').send({ arg: undefined });
+
+      expect(response.status).toBe(400);
+      expect(response.body).toEqual({ error: 'no parameters provided' });
+      expect(deleteConvos).not.toHaveBeenCalled();
+    });
+
+    it('should return 400 when request body is null (DoS prevention)', async () => {
+      const response = await request(app)
+        .delete('/api/convos')
+        .set('Content-Type', 'application/json')
+        .send('null');
+
+      expect(response.status).toBe(400);
+      expect(deleteConvos).not.toHaveBeenCalled();
+    });
+
     it('should return 500 if deleteConvoSharedLink fails', async () => {
       const mockConversationId = 'conv-error';
 
diff --git a/api/server/routes/__tests__/keys.spec.js b/api/server/routes/__tests__/keys.spec.js
new file mode 100644
index 0000000000..0c96dd3bcb
--- /dev/null
+++ b/api/server/routes/__tests__/keys.spec.js
@@ -0,0 +1,174 @@
+const express = require('express');
+const request = require('supertest');
+
+jest.mock('~/models', () => ({
+  updateUserKey: jest.fn(),
+  deleteUserKey: jest.fn(),
+  getUserKeyExpiry: jest.fn(),
+}));
+
+jest.mock('~/server/middleware/requireJwtAuth', () => (req, res, next) => next());
+
+jest.mock('~/server/middleware', () => ({
+  requireJwtAuth: (req, res, next) => next(),
+}));
+
+describe('Keys Routes', () => {
+  let app;
+  const { updateUserKey, deleteUserKey, getUserKeyExpiry } = require('~/models');
+
+  beforeAll(() => {
+    const keysRouter = require('../keys');
+
+    app = express();
+    app.use(express.json());
+
+    app.use((req, res, next) => {
+      req.user = { id: 'test-user-123' };
+      next();
+    });
+
+    app.use('/api/keys', keysRouter);
+  });
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('PUT /', () => {
+    it('should update a user key with the authenticated user ID', async () => {
+      updateUserKey.mockResolvedValue({});
+
+      const response = await request(app)
+        .put('/api/keys')
+        .send({ name: 'openAI', value: 'sk-test-key-123', expiresAt: '2026-12-31' });
+
+      expect(response.status).toBe(201);
+      expect(updateUserKey).toHaveBeenCalledWith({
+        userId: 'test-user-123',
+        name: 'openAI',
+        value: 'sk-test-key-123',
+        expiresAt: '2026-12-31',
+      });
+      expect(updateUserKey).toHaveBeenCalledTimes(1);
+    });
+
+    it('should not allow userId override via request body (IDOR prevention)', async () => {
+      updateUserKey.mockResolvedValue({});
+
+      const response = await request(app).put('/api/keys').send({
+        userId: 'attacker-injected-id',
+        name: 'openAI',
+        value: 'sk-attacker-key',
+      });
+
+      expect(response.status).toBe(201);
+      expect(updateUserKey).toHaveBeenCalledWith({
+        userId: 'test-user-123',
+        name: 'openAI',
+        value: 'sk-attacker-key',
+        expiresAt: undefined,
+      });
+    });
+
+    it('should ignore extraneous fields from request body', async () => {
+      updateUserKey.mockResolvedValue({});
+
+      const response = await request(app).put('/api/keys').send({
+        name: 'openAI',
+        value: 'sk-test-key',
+        expiresAt: '2026-12-31',
+        _id: 'injected-mongo-id',
+        __v: 99,
+        extra: 'should-be-ignored',
+      });
+
+      expect(response.status).toBe(201);
+      expect(updateUserKey).toHaveBeenCalledWith({
+        userId: 'test-user-123',
+        name: 'openAI',
+        value: 'sk-test-key',
+        expiresAt: '2026-12-31',
+      });
+    });
+
+    it('should handle missing optional fields', async () => {
+      updateUserKey.mockResolvedValue({});
+
+      const response = await request(app)
+        .put('/api/keys')
+        .send({ name: 'anthropic', value: 'sk-ant-key' });
+
+      expect(response.status).toBe(201);
+      expect(updateUserKey).toHaveBeenCalledWith({
+        userId: 'test-user-123',
+        name: 'anthropic',
+        value: 'sk-ant-key',
+        expiresAt: undefined,
+      });
+    });
+
+    it('should return 400 when request body is null', async () => {
+      const response = await request(app)
+        .put('/api/keys')
+        .set('Content-Type', 'application/json')
+        .send('null');
+
+      expect(response.status).toBe(400);
+      expect(updateUserKey).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('DELETE /:name', () => {
+    it('should delete a user key by name', async () => {
+      deleteUserKey.mockResolvedValue({});
+
+      const response = await request(app).delete('/api/keys/openAI');
+
+      expect(response.status).toBe(204);
+      expect(deleteUserKey).toHaveBeenCalledWith({
+        userId: 'test-user-123',
+        name: 'openAI',
+      });
+      expect(deleteUserKey).toHaveBeenCalledTimes(1);
+    });
+  });
+
+  describe('DELETE /', () => {
+    it('should delete all keys when all=true', async () => {
+      deleteUserKey.mockResolvedValue({});
+
+      const response = await request(app).delete('/api/keys?all=true');
+
+      expect(response.status).toBe(204);
+      expect(deleteUserKey).toHaveBeenCalledWith({
+        userId: 'test-user-123',
+        all: true,
+      });
+    });
+
+    it('should return 400 when all query param is not true', async () => {
+      const response = await request(app).delete('/api/keys');
+
+      expect(response.status).toBe(400);
+      expect(response.body).toEqual({ error: 'Specify either all=true to delete.' });
+      expect(deleteUserKey).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('GET /', () => {
+    it('should return key expiry for a given key name', async () => {
+      const mockExpiry = { expiresAt: '2026-12-31' };
+      getUserKeyExpiry.mockResolvedValue(mockExpiry);
+
+      const response = await request(app).get('/api/keys?name=openAI');
+
+      expect(response.status).toBe(200);
+      expect(response.body).toEqual(mockExpiry);
+      expect(getUserKeyExpiry).toHaveBeenCalledWith({
+        userId: 'test-user-123',
+        name: 'openAI',
+      });
+    });
+  });
+});
diff --git a/api/server/routes/__tests__/mcp.spec.js b/api/server/routes/__tests__/mcp.spec.js
index 26d7988f0a..e87fcf8f15 100644
--- a/api/server/routes/__tests__/mcp.spec.js
+++ b/api/server/routes/__tests__/mcp.spec.js
@@ -1,8 +1,18 @@
+const crypto = require('crypto');
 const express = require('express');
 const request = require('supertest');
 const mongoose = require('mongoose');
-const { MongoMemoryServer } = require('mongodb-memory-server');
+const cookieParser = require('cookie-parser');
 const { getBasePath } = require('@librechat/api');
+const { MongoMemoryServer } = require('mongodb-memory-server');
+
+function generateTestCsrfToken(flowId) {
+  return crypto
+    .createHmac('sha256', process.env.JWT_SECRET)
+    .update(flowId)
+    .digest('hex')
+    .slice(0, 32);
+}
 
 const mockRegistryInstance = {
   getServerConfig: jest.fn(),
@@ -130,6 +140,7 @@ describe('MCP Routes', () => {
 
     app = express();
     app.use(express.json());
+    app.use(cookieParser());
 
     app.use((req, res, next) => {
       req.user = { id: 'test-user-id' };
@@ -168,12 +179,12 @@ describe('MCP Routes', () => {
 
       MCPOAuthHandler.initiateOAuthFlow.mockResolvedValue({
         authorizationUrl: 'https://oauth.example.com/auth',
-        flowId: 'test-flow-id',
+        flowId: 'test-user-id:test-server',
       });
 
       const response = await request(app).get('/api/mcp/test-server/oauth/initiate').query({
         userId: 'test-user-id',
-        flowId: 'test-flow-id',
+        flowId: 'test-user-id:test-server',
       });
 
       expect(response.status).toBe(302);
@@ -190,7 +201,7 @@ describe('MCP Routes', () => {
     it('should return 403 when userId does not match authenticated user', async () => {
       const response = await request(app).get('/api/mcp/test-server/oauth/initiate').query({
         userId: 'different-user-id',
-        flowId: 'test-flow-id',
+        flowId: 'test-user-id:test-server',
       });
 
       expect(response.status).toBe(403);
@@ -228,7 +239,7 @@ describe('MCP Routes', () => {
 
       const response = await request(app).get('/api/mcp/test-server/oauth/initiate').query({
         userId: 'test-user-id',
-        flowId: 'test-flow-id',
+        flowId: 'test-user-id:test-server',
       });
 
       expect(response.status).toBe(400);
@@ -245,7 +256,7 @@ describe('MCP Routes', () => {
 
       const response = await request(app).get('/api/mcp/test-server/oauth/initiate').query({
         userId: 'test-user-id',
-        flowId: 'test-flow-id',
+        flowId: 'test-user-id:test-server',
       });
 
       expect(response.status).toBe(500);
@@ -255,7 +266,7 @@ describe('MCP Routes', () => {
     it('should return 400 when flow state metadata is null', async () => {
       const mockFlowManager = {
         getFlowState: jest.fn().mockResolvedValue({
-          id: 'test-flow-id',
+          id: 'test-user-id:test-server',
           metadata: null,
         }),
       };
@@ -265,7 +276,7 @@ describe('MCP Routes', () => {
 
       const response = await request(app).get('/api/mcp/test-server/oauth/initiate').query({
         userId: 'test-user-id',
-        flowId: 'test-flow-id',
+        flowId: 'test-user-id:test-server',
       });
 
       expect(response.status).toBe(400);
@@ -280,7 +291,7 @@ describe('MCP Routes', () => {
     it('should redirect to error page when OAuth error is received', async () => {
       const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
         error: 'access_denied',
-        state: 'test-flow-id',
+        state: 'test-user-id:test-server',
       });
       const basePath = getBasePath();
 
@@ -290,7 +301,7 @@ describe('MCP Routes', () => {
 
     it('should redirect to error page when code is missing', async () => {
       const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        state: 'test-flow-id',
+        state: 'test-user-id:test-server',
       });
       const basePath = getBasePath();
 
@@ -308,15 +319,50 @@ describe('MCP Routes', () => {
       expect(response.headers.location).toBe(`${basePath}/oauth/error?error=missing_state`);
     });
 
-    it('should redirect to error page when flow state is not found', async () => {
-      MCPOAuthHandler.getFlowState.mockResolvedValue(null);
-
+    it('should redirect to error page when CSRF cookie is missing', async () => {
       const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
         code: 'test-auth-code',
-        state: 'invalid-flow-id',
+        state: 'test-user-id:test-server',
       });
       const basePath = getBasePath();
 
+      expect(response.status).toBe(302);
+      expect(response.headers.location).toBe(
+        `${basePath}/oauth/error?error=csrf_validation_failed`,
+      );
+    });
+
+    it('should redirect to error page when CSRF cookie does not match state', async () => {
+      const csrfToken = generateTestCsrfToken('different-flow-id');
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: 'test-user-id:test-server',
+        });
+      const basePath = getBasePath();
+
+      expect(response.status).toBe(302);
+      expect(response.headers.location).toBe(
+        `${basePath}/oauth/error?error=csrf_validation_failed`,
+      );
+    });
+
+    it('should redirect to error page when flow state is not found', async () => {
+      MCPOAuthHandler.getFlowState.mockResolvedValue(null);
+      const flowId = 'invalid-flow:id';
+      const csrfToken = generateTestCsrfToken(flowId);
+
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
+      const basePath = getBasePath();
+
       expect(response.status).toBe(302);
       expect(response.headers.location).toBe(`${basePath}/oauth/error?error=invalid_state`);
     });
@@ -369,16 +415,22 @@ describe('MCP Routes', () => {
       });
       setCachedTools.mockResolvedValue();
 
-      const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        code: 'test-auth-code',
-        state: 'test-flow-id',
-      });
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
       const basePath = getBasePath();
 
       expect(response.status).toBe(302);
       expect(response.headers.location).toBe(`${basePath}/oauth/success?serverName=test-server`);
       expect(MCPOAuthHandler.completeOAuthFlow).toHaveBeenCalledWith(
-        'test-flow-id',
+        flowId,
         'test-auth-code',
         mockFlowManager,
         {},
@@ -400,16 +452,24 @@ describe('MCP Routes', () => {
         'mcp_oauth',
         mockTokens,
       );
-      expect(mockFlowManager.deleteFlow).toHaveBeenCalledWith('test-flow-id', 'mcp_get_tokens');
+      expect(mockFlowManager.deleteFlow).toHaveBeenCalledWith(
+        'test-user-id:test-server',
+        'mcp_get_tokens',
+      );
     });
 
     it('should redirect to error page when callback processing fails', async () => {
       MCPOAuthHandler.getFlowState.mockRejectedValue(new Error('Callback error'));
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
 
-      const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        code: 'test-auth-code',
-        state: 'test-flow-id',
-      });
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
       const basePath = getBasePath();
 
       expect(response.status).toBe(302);
@@ -442,15 +502,21 @@ describe('MCP Routes', () => {
       getLogStores.mockReturnValue({});
       require('~/config').getFlowStateManager.mockReturnValue(mockFlowManager);
 
-      const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        code: 'test-auth-code',
-        state: 'test-flow-id',
-      });
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
       const basePath = getBasePath();
 
       expect(response.status).toBe(302);
       expect(response.headers.location).toBe(`${basePath}/oauth/success?serverName=test-server`);
-      expect(mockFlowManager.deleteFlow).toHaveBeenCalledWith('test-flow-id', 'mcp_get_tokens');
+      expect(mockFlowManager.deleteFlow).toHaveBeenCalledWith(flowId, 'mcp_get_tokens');
     });
 
     it('should handle reconnection failure after OAuth', async () => {
@@ -488,16 +554,22 @@ describe('MCP Routes', () => {
       getCachedTools.mockResolvedValue({});
       setCachedTools.mockResolvedValue();
 
-      const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        code: 'test-auth-code',
-        state: 'test-flow-id',
-      });
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
       const basePath = getBasePath();
 
       expect(response.status).toBe(302);
       expect(response.headers.location).toBe(`${basePath}/oauth/success?serverName=test-server`);
       expect(MCPTokenStorage.storeTokens).toHaveBeenCalled();
-      expect(mockFlowManager.deleteFlow).toHaveBeenCalledWith('test-flow-id', 'mcp_get_tokens');
+      expect(mockFlowManager.deleteFlow).toHaveBeenCalledWith(flowId, 'mcp_get_tokens');
     });
 
     it('should redirect to error page if token storage fails', async () => {
@@ -530,10 +602,16 @@ describe('MCP Routes', () => {
       };
       require('~/config').getMCPManager.mockReturnValue(mockMcpManager);
 
-      const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        code: 'test-auth-code',
-        state: 'test-flow-id',
-      });
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
       const basePath = getBasePath();
 
       expect(response.status).toBe(302);
@@ -589,22 +667,27 @@ describe('MCP Routes', () => {
         clearReconnection: jest.fn(),
       });
 
-      const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        code: 'test-auth-code',
-        state: 'test-flow-id',
-      });
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
       const basePath = getBasePath();
 
       expect(response.status).toBe(302);
       expect(response.headers.location).toBe(`${basePath}/oauth/success?serverName=test-server`);
 
-      // Verify storeTokens was called with ORIGINAL flow state credentials
       expect(MCPTokenStorage.storeTokens).toHaveBeenCalledWith(
         expect.objectContaining({
           userId: 'test-user-id',
           serverName: 'test-server',
           tokens: mockTokens,
-          clientInfo: clientInfo, // Uses original flow state, not any "updated" credentials
+          clientInfo: clientInfo,
           metadata: flowState.metadata,
         }),
       );
@@ -631,16 +714,21 @@ describe('MCP Routes', () => {
       getLogStores.mockReturnValue({});
       require('~/config').getFlowStateManager.mockReturnValue(mockFlowManager);
 
-      const response = await request(app).get('/api/mcp/test-server/oauth/callback').query({
-        code: 'test-auth-code',
-        state: 'test-flow-id',
-      });
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
+      const response = await request(app)
+        .get('/api/mcp/test-server/oauth/callback')
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
+        .query({
+          code: 'test-auth-code',
+          state: flowId,
+        });
       const basePath = getBasePath();
 
       expect(response.status).toBe(302);
       expect(response.headers.location).toBe(`${basePath}/oauth/success?serverName=test-server`);
 
-      // Verify completeOAuthFlow was NOT called (prevented duplicate)
       expect(MCPOAuthHandler.completeOAuthFlow).not.toHaveBeenCalled();
       expect(MCPTokenStorage.storeTokens).not.toHaveBeenCalled();
     });
@@ -755,7 +843,7 @@ describe('MCP Routes', () => {
       getLogStores.mockReturnValue({});
       require('~/config').getFlowStateManager.mockReturnValue(mockFlowManager);
 
-      const response = await request(app).get('/api/mcp/oauth/status/test-flow-id');
+      const response = await request(app).get('/api/mcp/oauth/status/test-user-id:test-server');
 
       expect(response.status).toBe(200);
       expect(response.body).toEqual({
@@ -766,6 +854,13 @@ describe('MCP Routes', () => {
       });
     });
 
+    it('should return 403 when flowId does not match authenticated user', async () => {
+      const response = await request(app).get('/api/mcp/oauth/status/other-user-id:test-server');
+
+      expect(response.status).toBe(403);
+      expect(response.body).toEqual({ error: 'Access denied' });
+    });
+
     it('should return 404 when flow is not found', async () => {
       const mockFlowManager = {
         getFlowState: jest.fn().mockResolvedValue(null),
@@ -774,7 +869,7 @@ describe('MCP Routes', () => {
       getLogStores.mockReturnValue({});
       require('~/config').getFlowStateManager.mockReturnValue(mockFlowManager);
 
-      const response = await request(app).get('/api/mcp/oauth/status/non-existent-flow');
+      const response = await request(app).get('/api/mcp/oauth/status/test-user-id:non-existent');
 
       expect(response.status).toBe(404);
       expect(response.body).toEqual({ error: 'Flow not found' });
@@ -788,7 +883,7 @@ describe('MCP Routes', () => {
       getLogStores.mockReturnValue({});
       require('~/config').getFlowStateManager.mockReturnValue(mockFlowManager);
 
-      const response = await request(app).get('/api/mcp/oauth/status/error-flow-id');
+      const response = await request(app).get('/api/mcp/oauth/status/test-user-id:error-server');
 
       expect(response.status).toBe(500);
       expect(response.body).toEqual({ error: 'Failed to get flow status' });
@@ -1375,7 +1470,7 @@ describe('MCP Routes', () => {
         refresh_token: 'edge-refresh-token',
       };
       MCPOAuthHandler.getFlowState = jest.fn().mockResolvedValue({
-        id: 'test-flow-id',
+        id: 'test-user-id:test-server',
         userId: 'test-user-id',
         metadata: {
           serverUrl: 'https://example.com',
@@ -1403,8 +1498,12 @@ describe('MCP Routes', () => {
       };
       require('~/config').getMCPManager.mockReturnValue(mockMcpManager);
 
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
       const response = await request(app)
-        .get('/api/mcp/test-server/oauth/callback?code=test-code&state=test-flow-id')
+        .get(`/api/mcp/test-server/oauth/callback?code=test-code&state=${flowId}`)
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
         .expect(302);
 
       const basePath = getBasePath();
@@ -1424,7 +1523,7 @@ describe('MCP Routes', () => {
 
       const mockFlowManager = {
         getFlowState: jest.fn().mockResolvedValue({
-          id: 'test-flow-id',
+          id: 'test-user-id:test-server',
           userId: 'test-user-id',
           metadata: { serverUrl: 'https://example.com', oauth: {} },
           clientInfo: {},
@@ -1453,8 +1552,12 @@ describe('MCP Routes', () => {
       };
       require('~/config').getMCPManager.mockReturnValue(mockMcpManager);
 
+      const flowId = 'test-user-id:test-server';
+      const csrfToken = generateTestCsrfToken(flowId);
+
       const response = await request(app)
-        .get('/api/mcp/test-server/oauth/callback?code=test-code&state=test-flow-id')
+        .get(`/api/mcp/test-server/oauth/callback?code=test-code&state=${flowId}`)
+        .set('Cookie', [`oauth_csrf=${csrfToken}`])
         .expect(302);
 
       const basePath = getBasePath();
diff --git a/api/server/routes/accessPermissions.js b/api/server/routes/accessPermissions.js
index 79e7f3ddca..45afec133b 100644
--- a/api/server/routes/accessPermissions.js
+++ b/api/server/routes/accessPermissions.js
@@ -53,6 +53,12 @@ const checkResourcePermissionAccess = (requiredPermission) => (req, res, next) =
       requiredPermission,
       resourceIdParam: 'resourceId',
     });
+  } else if (resourceType === ResourceType.REMOTE_AGENT) {
+    middleware = canAccessResource({
+      resourceType: ResourceType.REMOTE_AGENT,
+      requiredPermission,
+      resourceIdParam: 'resourceId',
+    });
   } else if (resourceType === ResourceType.PROMPTGROUP) {
     middleware = canAccessResource({
       resourceType: ResourceType.PROMPTGROUP,
diff --git a/api/server/routes/actions.js b/api/server/routes/actions.js
index 14474a53d3..806edc66cc 100644
--- a/api/server/routes/actions.js
+++ b/api/server/routes/actions.js
@@ -1,14 +1,47 @@
 const express = require('express');
 const jwt = require('jsonwebtoken');
-const { getAccessToken, getBasePath } = require('@librechat/api');
 const { logger } = require('@librechat/data-schemas');
 const { CacheKeys } = require('librechat-data-provider');
+const {
+  getBasePath,
+  getAccessToken,
+  setOAuthSession,
+  validateOAuthCsrf,
+  OAUTH_CSRF_COOKIE,
+  setOAuthCsrfCookie,
+  validateOAuthSession,
+  OAUTH_SESSION_COOKIE,
+} = require('@librechat/api');
 const { findToken, updateToken, createToken } = require('~/models');
+const { requireJwtAuth } = require('~/server/middleware');
 const { getFlowStateManager } = require('~/config');
 const { getLogStores } = require('~/cache');
 
 const router = express.Router();
 const JWT_SECRET = process.env.JWT_SECRET;
+const OAUTH_CSRF_COOKIE_PATH = '/api/actions';
+
+/**
+ * Sets a CSRF cookie binding the action OAuth flow to the current browser session.
+ * Must be called before the user opens the IdP authorization URL.
+ *
+ * @route POST /actions/:action_id/oauth/bind
+ */
+router.post('/:action_id/oauth/bind', requireJwtAuth, setOAuthSession, async (req, res) => {
+  try {
+    const { action_id } = req.params;
+    const user = req.user;
+    if (!user?.id) {
+      return res.status(401).json({ error: 'User not authenticated' });
+    }
+    const flowId = `${user.id}:${action_id}`;
+    setOAuthCsrfCookie(res, flowId, OAUTH_CSRF_COOKIE_PATH);
+    res.json({ success: true });
+  } catch (error) {
+    logger.error('[Action OAuth] Failed to set CSRF binding cookie', error);
+    res.status(500).json({ error: 'Failed to bind OAuth flow' });
+  }
+});
 
 /**
  * Handles the OAuth callback and exchanges the authorization code for tokens.
@@ -45,7 +78,22 @@ router.get('/:action_id/oauth/callback', async (req, res) => {
       await flowManager.failFlow(identifier, 'oauth', 'Invalid user ID in state parameter');
       return res.redirect(`${basePath}/oauth/error?error=invalid_state`);
     }
+
     identifier = `${decodedState.user}:${action_id}`;
+
+    if (
+      !validateOAuthCsrf(req, res, identifier, OAUTH_CSRF_COOKIE_PATH) &&
+      !validateOAuthSession(req, decodedState.user)
+    ) {
+      logger.error('[Action OAuth] CSRF validation failed: no valid CSRF or session cookie', {
+        identifier,
+        hasCsrfCookie: !!req.cookies?.[OAUTH_CSRF_COOKIE],
+        hasSessionCookie: !!req.cookies?.[OAUTH_SESSION_COOKIE],
+      });
+      await flowManager.failFlow(identifier, 'oauth', 'CSRF validation failed');
+      return res.redirect(`${basePath}/oauth/error?error=csrf_validation_failed`);
+    }
+
     const flowState = await flowManager.getFlowState(identifier, 'oauth');
     if (!flowState) {
       throw new Error('OAuth flow not found');
@@ -71,7 +119,6 @@ router.get('/:action_id/oauth/callback', async (req, res) => {
     );
     await flowManager.completeFlow(identifier, 'oauth', tokenData);
 
-    /** Redirect to React success page */
     const serverName = flowState.metadata?.action_name || `Action ${action_id}`;
     const redirectUrl = `${basePath}/oauth/success?serverName=${encodeURIComponent(serverName)}`;
     res.redirect(redirectUrl);
diff --git a/api/server/routes/admin/auth.js b/api/server/routes/admin/auth.js
new file mode 100644
index 0000000000..291b5eaaf8
--- /dev/null
+++ b/api/server/routes/admin/auth.js
@@ -0,0 +1,127 @@
+const express = require('express');
+const passport = require('passport');
+const { randomState } = require('openid-client');
+const { logger } = require('@librechat/data-schemas');
+const { CacheKeys } = require('librechat-data-provider');
+const {
+  requireAdmin,
+  getAdminPanelUrl,
+  exchangeAdminCode,
+  createSetBalanceConfig,
+} = require('@librechat/api');
+const { loginController } = require('~/server/controllers/auth/LoginController');
+const { createOAuthHandler } = require('~/server/controllers/auth/oauth');
+const { getAppConfig } = require('~/server/services/Config');
+const getLogStores = require('~/cache/getLogStores');
+const { getOpenIdConfig } = require('~/strategies');
+const middleware = require('~/server/middleware');
+const { Balance } = require('~/db/models');
+
+const setBalanceConfig = createSetBalanceConfig({
+  getAppConfig,
+  Balance,
+});
+
+const router = express.Router();
+
+router.post(
+  '/login/local',
+  middleware.logHeaders,
+  middleware.loginLimiter,
+  middleware.checkBan,
+  middleware.requireLocalAuth,
+  requireAdmin,
+  setBalanceConfig,
+  loginController,
+);
+
+router.get('/verify', middleware.requireJwtAuth, requireAdmin, (req, res) => {
+  const { password: _p, totpSecret: _t, __v, ...user } = req.user;
+  user.id = user._id.toString();
+  res.status(200).json({ user });
+});
+
+router.get('/oauth/openid/check', (req, res) => {
+  const openidConfig = getOpenIdConfig();
+  if (!openidConfig) {
+    return res.status(404).json({
+      error: 'OpenID configuration not found',
+      error_code: 'OPENID_NOT_CONFIGURED',
+    });
+  }
+  res.status(200).json({ message: 'OpenID check successful' });
+});
+
+router.get('/oauth/openid', (req, res, next) => {
+  return passport.authenticate('openidAdmin', {
+    session: false,
+    state: randomState(),
+  })(req, res, next);
+});
+
+router.get(
+  '/oauth/openid/callback',
+  passport.authenticate('openidAdmin', {
+    failureRedirect: `${getAdminPanelUrl()}/auth/openid/callback?error=auth_failed&error_description=Authentication+failed`,
+    failureMessage: true,
+    session: false,
+  }),
+  requireAdmin,
+  setBalanceConfig,
+  middleware.checkDomainAllowed,
+  createOAuthHandler(`${getAdminPanelUrl()}/auth/openid/callback`),
+);
+
+/** Regex pattern for valid exchange codes: 64 hex characters */
+const EXCHANGE_CODE_PATTERN = /^[a-f0-9]{64}$/i;
+
+/**
+ * Exchange OAuth authorization code for tokens.
+ * This endpoint is called server-to-server by the admin panel.
+ * The code is one-time-use and expires in 30 seconds.
+ *
+ * POST /api/admin/oauth/exchange
+ * Body: { code: string }
+ * Response: { token: string, refreshToken: string, user: object }
+ */
+router.post('/oauth/exchange', middleware.loginLimiter, async (req, res) => {
+  try {
+    const { code } = req.body;
+
+    if (!code) {
+      logger.warn('[admin/oauth/exchange] Missing authorization code');
+      return res.status(400).json({
+        error: 'Missing authorization code',
+        error_code: 'MISSING_CODE',
+      });
+    }
+
+    if (typeof code !== 'string' || !EXCHANGE_CODE_PATTERN.test(code)) {
+      logger.warn('[admin/oauth/exchange] Invalid authorization code format');
+      return res.status(400).json({
+        error: 'Invalid authorization code format',
+        error_code: 'INVALID_CODE_FORMAT',
+      });
+    }
+
+    const cache = getLogStores(CacheKeys.ADMIN_OAUTH_EXCHANGE);
+    const result = await exchangeAdminCode(cache, code);
+
+    if (!result) {
+      return res.status(401).json({
+        error: 'Invalid or expired authorization code',
+        error_code: 'INVALID_OR_EXPIRED_CODE',
+      });
+    }
+
+    res.json(result);
+  } catch (error) {
+    logger.error('[admin/oauth/exchange] Error:', error);
+    res.status(500).json({
+      error: 'Internal server error',
+      error_code: 'INTERNAL_ERROR',
+    });
+  }
+});
+
+module.exports = router;
diff --git a/api/server/routes/agents/__tests__/abort.spec.js b/api/server/routes/agents/__tests__/abort.spec.js
new file mode 100644
index 0000000000..442665d973
--- /dev/null
+++ b/api/server/routes/agents/__tests__/abort.spec.js
@@ -0,0 +1,303 @@
+/**
+ * Tests for the agent abort endpoint
+ *
+ * Tests the following fixes from PR #11462:
+ * 1. Authorization check - only job owner can abort
+ * 2. Early abort handling - skip save when no responseMessageId
+ * 3. Partial response saving - save message before returning
+ */
+
+const express = require('express');
+const request = require('supertest');
+
+const mockLogger = {
+  debug: jest.fn(),
+  warn: jest.fn(),
+  error: jest.fn(),
+  info: jest.fn(),
+};
+
+const mockGenerationJobManager = {
+  getJob: jest.fn(),
+  abortJob: jest.fn(),
+  getActiveJobIdsForUser: jest.fn(),
+};
+
+const mockSaveMessage = jest.fn();
+
+jest.mock('@librechat/data-schemas', () => ({
+  ...jest.requireActual('@librechat/data-schemas'),
+  logger: mockLogger,
+}));
+
+jest.mock('@librechat/api', () => ({
+  ...jest.requireActual('@librechat/api'),
+  isEnabled: jest.fn().mockReturnValue(false),
+  GenerationJobManager: mockGenerationJobManager,
+}));
+
+jest.mock('~/models', () => ({
+  saveMessage: (...args) => mockSaveMessage(...args),
+}));
+
+jest.mock('~/server/middleware', () => ({
+  uaParser: (req, res, next) => next(),
+  checkBan: (req, res, next) => next(),
+  requireJwtAuth: (req, res, next) => {
+    req.user = { id: 'test-user-123' };
+    next();
+  },
+  messageIpLimiter: (req, res, next) => next(),
+  configMiddleware: (req, res, next) => next(),
+  messageUserLimiter: (req, res, next) => next(),
+}));
+
+// Mock the chat module - needs to be a router
+jest.mock('~/server/routes/agents/chat', () => require('express').Router());
+
+// Mock the v1 module - v1 is directly used as middleware
+jest.mock('~/server/routes/agents/v1', () => ({
+  v1: require('express').Router(),
+}));
+
+// Import after mocks
+const agentRoutes = require('~/server/routes/agents/index');
+
+describe('Agent Abort Endpoint', () => {
+  let app;
+
+  beforeAll(() => {
+    app = express();
+    app.use(express.json());
+    app.use('/api/agents', agentRoutes);
+  });
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('POST /chat/abort', () => {
+    describe('Authorization', () => {
+      it("should return 403 when user tries to abort another user's job", async () => {
+        const jobStreamId = 'test-stream-123';
+
+        mockGenerationJobManager.getJob.mockResolvedValue({
+          metadata: { userId: 'other-user-456' },
+        });
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: jobStreamId });
+
+        expect(response.status).toBe(403);
+        expect(response.body).toEqual({ error: 'Unauthorized' });
+        expect(mockLogger.warn).toHaveBeenCalledWith(
+          expect.stringContaining('Unauthorized abort attempt'),
+        );
+        expect(mockGenerationJobManager.abortJob).not.toHaveBeenCalled();
+      });
+
+      it('should allow abort when user owns the job', async () => {
+        const jobStreamId = 'test-stream-123';
+
+        mockGenerationJobManager.getJob.mockResolvedValue({
+          metadata: { userId: 'test-user-123' },
+        });
+
+        mockGenerationJobManager.abortJob.mockResolvedValue({
+          success: true,
+          jobData: null,
+          content: [],
+          text: '',
+        });
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: jobStreamId });
+
+        expect(response.status).toBe(200);
+        expect(response.body).toEqual({ success: true, aborted: jobStreamId });
+        expect(mockGenerationJobManager.abortJob).toHaveBeenCalledWith(jobStreamId);
+      });
+
+      it('should allow abort when job has no userId metadata (backwards compatibility)', async () => {
+        const jobStreamId = 'test-stream-123';
+
+        mockGenerationJobManager.getJob.mockResolvedValue({
+          metadata: {},
+        });
+
+        mockGenerationJobManager.abortJob.mockResolvedValue({
+          success: true,
+          jobData: null,
+          content: [],
+          text: '',
+        });
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: jobStreamId });
+
+        expect(response.status).toBe(200);
+        expect(response.body).toEqual({ success: true, aborted: jobStreamId });
+      });
+    });
+
+    describe('Early Abort Handling', () => {
+      it('should skip message saving when responseMessageId is missing (early abort)', async () => {
+        const jobStreamId = 'test-stream-123';
+
+        mockGenerationJobManager.getJob.mockResolvedValue({
+          metadata: { userId: 'test-user-123' },
+        });
+
+        mockGenerationJobManager.abortJob.mockResolvedValue({
+          success: true,
+          jobData: {
+            userMessage: { messageId: 'user-msg-123' },
+            // No responseMessageId - early abort before generation started
+            conversationId: jobStreamId,
+          },
+          content: [],
+          text: '',
+        });
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: jobStreamId });
+
+        expect(response.status).toBe(200);
+        expect(mockSaveMessage).not.toHaveBeenCalled();
+      });
+
+      it('should skip message saving when userMessage is missing', async () => {
+        const jobStreamId = 'test-stream-123';
+
+        mockGenerationJobManager.getJob.mockResolvedValue({
+          metadata: { userId: 'test-user-123' },
+        });
+
+        mockGenerationJobManager.abortJob.mockResolvedValue({
+          success: true,
+          jobData: {
+            // No userMessage
+            responseMessageId: 'response-msg-123',
+            conversationId: jobStreamId,
+          },
+          content: [],
+          text: '',
+        });
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: jobStreamId });
+
+        expect(response.status).toBe(200);
+        expect(mockSaveMessage).not.toHaveBeenCalled();
+      });
+    });
+
+    describe('Partial Response Saving', () => {
+      it('should save partial response when both userMessage and responseMessageId exist', async () => {
+        const jobStreamId = 'test-stream-123';
+        const userMessageId = 'user-msg-123';
+        const responseMessageId = 'response-msg-456';
+
+        mockGenerationJobManager.getJob.mockResolvedValue({
+          metadata: { userId: 'test-user-123' },
+        });
+
+        mockGenerationJobManager.abortJob.mockResolvedValue({
+          success: true,
+          jobData: {
+            userMessage: { messageId: userMessageId },
+            responseMessageId,
+            conversationId: jobStreamId,
+            sender: 'TestAgent',
+            endpoint: 'anthropic',
+            model: 'claude-3',
+          },
+          content: [{ type: 'text', text: 'Partial response...' }],
+          text: 'Partial response...',
+        });
+
+        mockSaveMessage.mockResolvedValue();
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: jobStreamId });
+
+        expect(response.status).toBe(200);
+        expect(mockSaveMessage).toHaveBeenCalledWith(
+          expect.anything(),
+          expect.objectContaining({
+            messageId: responseMessageId,
+            parentMessageId: userMessageId,
+            conversationId: jobStreamId,
+            content: [{ type: 'text', text: 'Partial response...' }],
+            text: 'Partial response...',
+            sender: 'TestAgent',
+            endpoint: 'anthropic',
+            model: 'claude-3',
+            unfinished: true,
+            error: false,
+            isCreatedByUser: false,
+            user: 'test-user-123',
+          }),
+          expect.objectContaining({
+            context: 'api/server/routes/agents/index.js - abort endpoint',
+          }),
+        );
+      });
+
+      it('should handle saveMessage errors gracefully', async () => {
+        const jobStreamId = 'test-stream-123';
+
+        mockGenerationJobManager.getJob.mockResolvedValue({
+          metadata: { userId: 'test-user-123' },
+        });
+
+        mockGenerationJobManager.abortJob.mockResolvedValue({
+          success: true,
+          jobData: {
+            userMessage: { messageId: 'user-msg-123' },
+            responseMessageId: 'response-msg-456',
+            conversationId: jobStreamId,
+          },
+          content: [],
+          text: '',
+        });
+
+        mockSaveMessage.mockRejectedValue(new Error('Database error'));
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: jobStreamId });
+
+        // Should still return success even if save fails
+        expect(response.status).toBe(200);
+        expect(response.body).toEqual({ success: true, aborted: jobStreamId });
+        expect(mockLogger.error).toHaveBeenCalledWith(
+          expect.stringContaining('Failed to save partial response'),
+        );
+      });
+    });
+
+    describe('Job Not Found', () => {
+      it('should return 404 when job is not found', async () => {
+        mockGenerationJobManager.getJob.mockResolvedValue(null);
+        mockGenerationJobManager.getActiveJobIdsForUser.mockResolvedValue([]);
+
+        const response = await request(app)
+          .post('/api/agents/chat/abort')
+          .send({ conversationId: 'non-existent-job' });
+
+        expect(response.status).toBe(404);
+        expect(response.body).toEqual({
+          error: 'Job not found',
+          streamId: 'non-existent-job',
+        });
+      });
+    });
+  });
+});
diff --git a/api/server/routes/agents/__tests__/responses.spec.js b/api/server/routes/agents/__tests__/responses.spec.js
new file mode 100644
index 0000000000..4d83219b84
--- /dev/null
+++ b/api/server/routes/agents/__tests__/responses.spec.js
@@ -0,0 +1,1125 @@
+/**
+ * Open Responses API Integration Tests
+ *
+ * Tests the /v1/responses endpoint against the Open Responses specification
+ * compliance tests. Uses real Anthropic API for LLM calls.
+ *
+ * @see https://openresponses.org/specification
+ * @see https://github.com/openresponses/openresponses/blob/main/src/lib/compliance-tests.ts
+ */
+
+// Load environment variables from root .env file for API keys
+require('dotenv').config({ path: require('path').resolve(__dirname, '../../../../../.env') });
+
+const originalEnv = {
+  CREDS_KEY: process.env.CREDS_KEY,
+  CREDS_IV: process.env.CREDS_IV,
+};
+
+process.env.CREDS_KEY = '0123456789abcdef0123456789abcdef';
+process.env.CREDS_IV = '0123456789abcdef';
+
+/** Skip tests if ANTHROPIC_API_KEY is not available */
+const SKIP_INTEGRATION_TESTS = !process.env.ANTHROPIC_API_KEY;
+if (SKIP_INTEGRATION_TESTS) {
+  console.warn('ANTHROPIC_API_KEY not found - skipping integration tests');
+}
+
+jest.mock('meilisearch', () => ({
+  MeiliSearch: jest.fn().mockImplementation(() => ({
+    getIndex: jest.fn().mockRejectedValue(new Error('mocked')),
+    index: jest.fn().mockReturnValue({
+      getRawInfo: jest.fn().mockResolvedValue({ primaryKey: 'id' }),
+      updateSettings: jest.fn().mockResolvedValue({}),
+      addDocuments: jest.fn().mockResolvedValue({}),
+      updateDocuments: jest.fn().mockResolvedValue({}),
+      deleteDocument: jest.fn().mockResolvedValue({}),
+    }),
+  })),
+}));
+
+jest.mock('~/server/services/Config', () => ({
+  loadCustomConfig: jest.fn(() => Promise.resolve({})),
+  getAppConfig: jest.fn().mockResolvedValue({
+    paths: {
+      uploads: '/tmp',
+      dist: '/tmp/dist',
+      fonts: '/tmp/fonts',
+      assets: '/tmp/assets',
+    },
+    fileStrategy: 'local',
+    imageOutputType: 'PNG',
+    endpoints: {
+      agents: {
+        allowedProviders: ['anthropic', 'openAI'],
+      },
+    },
+  }),
+  setCachedTools: jest.fn(),
+  getCachedTools: jest.fn(),
+  getMCPServerTools: jest.fn().mockReturnValue([]),
+}));
+
+jest.mock('~/app/clients/tools', () => ({
+  createOpenAIImageTools: jest.fn(() => []),
+  createYouTubeTools: jest.fn(() => []),
+  manifestToolMap: {},
+  toolkits: [],
+}));
+
+jest.mock('~/config', () => ({
+  createMCPServersRegistry: jest.fn(),
+  createMCPManager: jest.fn().mockResolvedValue({
+    getAppToolFunctions: jest.fn().mockResolvedValue({}),
+  }),
+}));
+
+const express = require('express');
+const request = require('supertest');
+const mongoose = require('mongoose');
+const { v4: uuidv4 } = require('uuid');
+const { MongoMemoryServer } = require('mongodb-memory-server');
+const { hashToken, getRandomValues, createModels } = require('@librechat/data-schemas');
+const {
+  SystemRoles,
+  ResourceType,
+  AccessRoleIds,
+  PrincipalType,
+  PrincipalModel,
+  PermissionBits,
+  EModelEndpoint,
+} = require('librechat-data-provider');
+
+/** @type {import('mongoose').Model} */
+let Agent;
+/** @type {import('mongoose').Model} */
+let AgentApiKey;
+/** @type {import('mongoose').Model} */
+let User;
+/** @type {import('mongoose').Model} */
+let AclEntry;
+/** @type {import('mongoose').Model} */
+let AccessRole;
+
+/**
+ * Parse SSE stream into events
+ * @param {string} text - Raw SSE text
+ * @returns {Array<{event: string, data: unknown}>}
+ */
+function parseSSEEvents(text) {
+  const events = [];
+  const lines = text.split('\n');
+
+  let currentEvent = '';
+  let currentData = '';
+
+  for (const line of lines) {
+    if (line.startsWith('event:')) {
+      currentEvent = line.slice(6).trim();
+    } else if (line.startsWith('data:')) {
+      currentData = line.slice(5).trim();
+    } else if (line === '' && currentData) {
+      if (currentData === '[DONE]') {
+        events.push({ event: 'done', data: '[DONE]' });
+      } else {
+        try {
+          const parsed = JSON.parse(currentData);
+          events.push({
+            event: currentEvent || parsed.type || 'unknown',
+            data: parsed,
+          });
+        } catch {
+          // Skip unparseable data
+        }
+      }
+      currentEvent = '';
+      currentData = '';
+    }
+  }
+
+  return events;
+}
+
+/**
+ * Valid streaming event types per Open Responses specification
+ * @see https://github.com/openresponses/openresponses/blob/main/src/lib/sse-parser.ts
+ */
+const VALID_STREAMING_EVENT_TYPES = new Set([
+  // Standard Open Responses events
+  'response.created',
+  'response.queued',
+  'response.in_progress',
+  'response.completed',
+  'response.failed',
+  'response.incomplete',
+  'response.output_item.added',
+  'response.output_item.done',
+  'response.content_part.added',
+  'response.content_part.done',
+  'response.output_text.delta',
+  'response.output_text.done',
+  'response.refusal.delta',
+  'response.refusal.done',
+  'response.function_call_arguments.delta',
+  'response.function_call_arguments.done',
+  'response.reasoning_summary_part.added',
+  'response.reasoning_summary_part.done',
+  'response.reasoning.delta',
+  'response.reasoning.done',
+  'response.reasoning_summary_text.delta',
+  'response.reasoning_summary_text.done',
+  'response.output_text.annotation.added',
+  'error',
+  // LibreChat extension events (prefixed per Open Responses spec)
+  // @see https://openresponses.org/specification#extending-streaming-events
+  'librechat:attachment',
+]);
+
+/**
+ * Validate a streaming event against Open Responses spec
+ * @param {Object} event - Parsed event with data
+ * @returns {string[]} Array of validation errors
+ */
+function validateStreamingEvent(event) {
+  const errors = [];
+  const data = event.data;
+
+  if (!data || typeof data !== 'object') {
+    return errors; // Skip non-object data (e.g., [DONE])
+  }
+
+  const eventType = data.type;
+
+  // Check event type is valid
+  if (!VALID_STREAMING_EVENT_TYPES.has(eventType)) {
+    errors.push(`Invalid event type: ${eventType}`);
+    return errors;
+  }
+
+  // Validate required fields based on event type
+  switch (eventType) {
+    case 'response.output_text.delta':
+      if (typeof data.sequence_number !== 'number') {
+        errors.push('response.output_text.delta: missing sequence_number');
+      }
+      if (typeof data.item_id !== 'string') {
+        errors.push('response.output_text.delta: missing item_id');
+      }
+      if (typeof data.output_index !== 'number') {
+        errors.push('response.output_text.delta: missing output_index');
+      }
+      if (typeof data.content_index !== 'number') {
+        errors.push('response.output_text.delta: missing content_index');
+      }
+      if (typeof data.delta !== 'string') {
+        errors.push('response.output_text.delta: missing delta');
+      }
+      if (!Array.isArray(data.logprobs)) {
+        errors.push('response.output_text.delta: missing logprobs array');
+      }
+      break;
+
+    case 'response.output_text.done':
+      if (typeof data.sequence_number !== 'number') {
+        errors.push('response.output_text.done: missing sequence_number');
+      }
+      if (typeof data.item_id !== 'string') {
+        errors.push('response.output_text.done: missing item_id');
+      }
+      if (typeof data.output_index !== 'number') {
+        errors.push('response.output_text.done: missing output_index');
+      }
+      if (typeof data.content_index !== 'number') {
+        errors.push('response.output_text.done: missing content_index');
+      }
+      if (typeof data.text !== 'string') {
+        errors.push('response.output_text.done: missing text');
+      }
+      if (!Array.isArray(data.logprobs)) {
+        errors.push('response.output_text.done: missing logprobs array');
+      }
+      break;
+
+    case 'response.reasoning.delta':
+      if (typeof data.sequence_number !== 'number') {
+        errors.push('response.reasoning.delta: missing sequence_number');
+      }
+      if (typeof data.item_id !== 'string') {
+        errors.push('response.reasoning.delta: missing item_id');
+      }
+      if (typeof data.output_index !== 'number') {
+        errors.push('response.reasoning.delta: missing output_index');
+      }
+      if (typeof data.content_index !== 'number') {
+        errors.push('response.reasoning.delta: missing content_index');
+      }
+      if (typeof data.delta !== 'string') {
+        errors.push('response.reasoning.delta: missing delta');
+      }
+      break;
+
+    case 'response.reasoning.done':
+      if (typeof data.sequence_number !== 'number') {
+        errors.push('response.reasoning.done: missing sequence_number');
+      }
+      if (typeof data.item_id !== 'string') {
+        errors.push('response.reasoning.done: missing item_id');
+      }
+      if (typeof data.output_index !== 'number') {
+        errors.push('response.reasoning.done: missing output_index');
+      }
+      if (typeof data.content_index !== 'number') {
+        errors.push('response.reasoning.done: missing content_index');
+      }
+      if (typeof data.text !== 'string') {
+        errors.push('response.reasoning.done: missing text');
+      }
+      break;
+
+    case 'response.in_progress':
+    case 'response.completed':
+    case 'response.failed':
+      if (!data.response || typeof data.response !== 'object') {
+        errors.push(`${eventType}: missing response object`);
+      }
+      break;
+
+    case 'response.output_item.added':
+    case 'response.output_item.done':
+      if (typeof data.output_index !== 'number') {
+        errors.push(`${eventType}: missing output_index`);
+      }
+      if (!data.item || typeof data.item !== 'object') {
+        errors.push(`${eventType}: missing item object`);
+      }
+      break;
+  }
+
+  return errors;
+}
+
+/**
+ * Validate all streaming events and return errors
+ * @param {Array} events - Array of parsed events
+ * @returns {string[]} Array of all validation errors
+ */
+function validateAllStreamingEvents(events) {
+  const allErrors = [];
+  for (const event of events) {
+    const errors = validateStreamingEvent(event);
+    allErrors.push(...errors);
+  }
+  return allErrors;
+}
+
+/**
+ * Create a test agent with Anthropic provider
+ * @param {Object} overrides
+ * @returns {Promise<Object>}
+ */
+async function createTestAgent(overrides = {}) {
+  const timestamp = new Date();
+  const agentData = {
+    id: `agent_${uuidv4().replace(/-/g, '').substring(0, 21)}`,
+    name: 'Test Anthropic Agent',
+    description: 'An agent for testing Open Responses API',
+    instructions: 'You are a helpful assistant. Be concise.',
+    provider: EModelEndpoint.anthropic,
+    model: 'claude-sonnet-4-5-20250929',
+    author: new mongoose.Types.ObjectId(),
+    tools: [],
+    model_parameters: {},
+    ...overrides,
+  };
+
+  const versionData = { ...agentData };
+  delete versionData.author;
+
+  const initialAgentData = {
+    ...agentData,
+    versions: [
+      {
+        ...versionData,
+        createdAt: timestamp,
+        updatedAt: timestamp,
+      },
+    ],
+    category: 'general',
+  };
+
+  return (await Agent.create(initialAgentData)).toObject();
+}
+
+/**
+ * Create an agent with extended thinking enabled
+ * @param {Object} overrides
+ * @returns {Promise<Object>}
+ */
+async function createThinkingAgent(overrides = {}) {
+  return createTestAgent({
+    name: 'Test Thinking Agent',
+    description: 'An agent with extended thinking enabled',
+    model_parameters: {
+      thinking: {
+        type: 'enabled',
+        budget_tokens: 5000,
+      },
+    },
+    ...overrides,
+  });
+}
+
+const describeWithApiKey = SKIP_INTEGRATION_TESTS ? describe.skip : describe;
+
+describeWithApiKey('Open Responses API Integration Tests', () => {
+  // Increase timeout for real API calls
+  jest.setTimeout(120000);
+
+  let mongoServer;
+  let app;
+  let testAgent;
+  let thinkingAgent;
+  let testUser;
+  let testApiKey; // The raw API key for Authorization header
+
+  afterAll(() => {
+    process.env.CREDS_KEY = originalEnv.CREDS_KEY;
+    process.env.CREDS_IV = originalEnv.CREDS_IV;
+  });
+
+  beforeAll(async () => {
+    // Start MongoDB Memory Server
+    mongoServer = await MongoMemoryServer.create();
+    const mongoUri = mongoServer.getUri();
+
+    // Connect to MongoDB
+    await mongoose.connect(mongoUri);
+
+    // Register all models
+    const models = createModels(mongoose);
+
+    // Get models
+    Agent = models.Agent;
+    AgentApiKey = models.AgentApiKey;
+    User = models.User;
+    AclEntry = models.AclEntry;
+    AccessRole = models.AccessRole;
+
+    // Create minimal Express app with just the responses routes
+    app = express();
+    app.use(express.json());
+
+    // Mount the responses routes
+    const responsesRoutes = require('~/server/routes/agents/responses');
+    app.use('/api/agents/v1/responses', responsesRoutes);
+
+    // Create test user
+    testUser = await User.create({
+      name: 'Test API User',
+      username: 'testapiuser',
+      email: 'testapiuser@test.com',
+      emailVerified: true,
+      provider: 'local',
+      role: SystemRoles.ADMIN,
+    });
+
+    // Create REMOTE_AGENT access roles (if they don't exist)
+    const existingRoles = await AccessRole.find({
+      accessRoleId: {
+        $in: [
+          AccessRoleIds.REMOTE_AGENT_VIEWER,
+          AccessRoleIds.REMOTE_AGENT_EDITOR,
+          AccessRoleIds.REMOTE_AGENT_OWNER,
+        ],
+      },
+    });
+
+    if (existingRoles.length === 0) {
+      await AccessRole.create([
+        {
+          accessRoleId: AccessRoleIds.REMOTE_AGENT_VIEWER,
+          name: 'API Viewer',
+          description: 'Can query the agent via API',
+          resourceType: ResourceType.REMOTE_AGENT,
+          permBits: PermissionBits.VIEW,
+        },
+        {
+          accessRoleId: AccessRoleIds.REMOTE_AGENT_EDITOR,
+          name: 'API Editor',
+          description: 'Can view and modify the agent via API',
+          resourceType: ResourceType.REMOTE_AGENT,
+          permBits: PermissionBits.VIEW | PermissionBits.EDIT,
+        },
+        {
+          accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+          name: 'API Owner',
+          description: 'Full API access + can grant remote access to others',
+          resourceType: ResourceType.REMOTE_AGENT,
+          permBits:
+            PermissionBits.VIEW |
+            PermissionBits.EDIT |
+            PermissionBits.DELETE |
+            PermissionBits.SHARE,
+        },
+      ]);
+    }
+
+    // Generate and create an API key for the test user
+    const rawKey = `sk-${await getRandomValues(32)}`;
+    const keyHash = await hashToken(rawKey);
+    const keyPrefix = rawKey.substring(0, 8);
+
+    await AgentApiKey.create({
+      userId: testUser._id,
+      name: 'Test API Key',
+      keyHash,
+      keyPrefix,
+    });
+
+    testApiKey = rawKey;
+
+    // Create test agents with the test user as author
+    testAgent = await createTestAgent({ author: testUser._id });
+    thinkingAgent = await createThinkingAgent({ author: testUser._id });
+
+    // Grant REMOTE_AGENT permissions for the test agents
+    await AclEntry.create([
+      {
+        principalType: PrincipalType.USER,
+        principalModel: PrincipalModel.USER,
+        principalId: testUser._id,
+        resourceType: ResourceType.REMOTE_AGENT,
+        resourceId: testAgent._id,
+        accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+        permBits:
+          PermissionBits.VIEW | PermissionBits.EDIT | PermissionBits.DELETE | PermissionBits.SHARE,
+      },
+      {
+        principalType: PrincipalType.USER,
+        principalModel: PrincipalModel.USER,
+        principalId: testUser._id,
+        resourceType: ResourceType.REMOTE_AGENT,
+        resourceId: thinkingAgent._id,
+        accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+        permBits:
+          PermissionBits.VIEW | PermissionBits.EDIT | PermissionBits.DELETE | PermissionBits.SHARE,
+      },
+    ]);
+  }, 60000);
+
+  afterAll(async () => {
+    await mongoose.disconnect();
+    await mongoServer.stop();
+  });
+
+  beforeEach(async () => {
+    // Clean up any test data between tests if needed
+  });
+
+  /* ===========================================================================
+   * COMPLIANCE TESTS
+   * Based on: https://github.com/openresponses/openresponses/blob/main/src/lib/compliance-tests.ts
+   * =========================================================================== */
+
+  /** Helper to add auth header to requests */
+  const authRequest = () => ({
+    post: (url) => request(app).post(url).set('Authorization', `Bearer ${testApiKey}`),
+    get: (url) => request(app).get(url).set('Authorization', `Bearer ${testApiKey}`),
+  });
+
+  describe('Compliance Tests', () => {
+    describe('basic-response', () => {
+      it('should return a valid ResponseResource for a simple text request', async () => {
+        const response = await authRequest()
+          .post('/api/agents/v1/responses')
+          .send({
+            model: testAgent.id,
+            input: [
+              {
+                type: 'message',
+                role: 'user',
+                content: 'Say hello in exactly 3 words.',
+              },
+            ],
+          });
+
+        expect(response.status).toBe(200);
+        expect(response.body).toBeDefined();
+
+        // Validate ResponseResource schema
+        const body = response.body;
+        expect(body.id).toMatch(/^resp_/);
+        expect(body.object).toBe('response');
+        expect(typeof body.created_at).toBe('number');
+        expect(body.status).toBe('completed');
+        expect(body.model).toBe(testAgent.id);
+
+        // Validate output
+        expect(Array.isArray(body.output)).toBe(true);
+        expect(body.output.length).toBeGreaterThan(0);
+
+        // Should have at least one message item
+        const messageItem = body.output.find((item) => item.type === 'message');
+        expect(messageItem).toBeDefined();
+        expect(messageItem.role).toBe('assistant');
+        expect(messageItem.status).toBe('completed');
+        expect(Array.isArray(messageItem.content)).toBe(true);
+      });
+    });
+
+    describe('streaming-response', () => {
+      it('should return valid SSE streaming events', async () => {
+        const response = await authRequest()
+          .post('/api/agents/v1/responses')
+          .send({
+            model: testAgent.id,
+            input: [
+              {
+                type: 'message',
+                role: 'user',
+                content: 'Count from 1 to 5.',
+              },
+            ],
+            stream: true,
+          })
+          .buffer(true)
+          .parse((res, callback) => {
+            let data = '';
+            res.on('data', (chunk) => {
+              data += chunk.toString();
+            });
+            res.on('end', () => {
+              callback(null, data);
+            });
+          });
+
+        expect(response.status).toBe(200);
+        expect(response.headers['content-type']).toMatch(/text\/event-stream/);
+
+        const events = parseSSEEvents(response.body);
+        expect(events.length).toBeGreaterThan(0);
+
+        // Validate all streaming events against Open Responses spec
+        // This catches issues like:
+        // - Invalid event types (e.g., response.reasoning_text.delta instead of response.reasoning.delta)
+        // - Missing required fields (e.g., logprobs on output_text events)
+        const validationErrors = validateAllStreamingEvents(events);
+        if (validationErrors.length > 0) {
+          console.error('Streaming event validation errors:', validationErrors);
+        }
+        expect(validationErrors).toEqual([]);
+
+        // Validate streaming event types
+        const eventTypes = events.map((e) => e.event);
+
+        // Should have response.created first (per Open Responses spec)
+        expect(eventTypes).toContain('response.created');
+
+        // Should have response.in_progress
+        expect(eventTypes).toContain('response.in_progress');
+
+        // response.created should come before response.in_progress
+        const createdIdx = eventTypes.indexOf('response.created');
+        const inProgressIdx = eventTypes.indexOf('response.in_progress');
+        expect(createdIdx).toBeLessThan(inProgressIdx);
+
+        // Should have response.completed or response.failed
+        expect(eventTypes.some((t) => t === 'response.completed' || t === 'response.failed')).toBe(
+          true,
+        );
+
+        // Should have [DONE]
+        expect(eventTypes).toContain('done');
+
+        // Validate response.completed has full response
+        const completedEvent = events.find((e) => e.event === 'response.completed');
+        if (completedEvent) {
+          expect(completedEvent.data.response).toBeDefined();
+          expect(completedEvent.data.response.status).toBe('completed');
+          expect(completedEvent.data.response.output.length).toBeGreaterThan(0);
+        }
+      });
+
+      it('should emit valid event types per Open Responses spec', async () => {
+        const response = await authRequest()
+          .post('/api/agents/v1/responses')
+          .send({
+            model: testAgent.id,
+            input: [
+              {
+                type: 'message',
+                role: 'user',
+                content: 'Say hi.',
+              },
+            ],
+            stream: true,
+          })
+          .buffer(true)
+          .parse((res, callback) => {
+            let data = '';
+            res.on('data', (chunk) => {
+              data += chunk.toString();
+            });
+            res.on('end', () => {
+              callback(null, data);
+            });
+          });
+
+        expect(response.status).toBe(200);
+
+        const events = parseSSEEvents(response.body);
+
+        // Check all event types are valid
+        for (const event of events) {
+          if (event.data && typeof event.data === 'object' && event.data.type) {
+            expect(VALID_STREAMING_EVENT_TYPES.has(event.data.type)).toBe(true);
+          }
+        }
+      });
+
+      it('should include logprobs array in output_text events', async () => {
+        const response = await authRequest()
+          .post('/api/agents/v1/responses')
+          .send({
+            model: testAgent.id,
+            input: [
+              {
+                type: 'message',
+                role: 'user',
+                content: 'Say one word.',
+              },
+            ],
+            stream: true,
+          })
+          .buffer(true)
+          .parse((res, callback) => {
+            let data = '';
+            res.on('data', (chunk) => {
+              data += chunk.toString();
+            });
+            res.on('end', () => {
+              callback(null, data);
+            });
+          });
+
+        expect(response.status).toBe(200);
+
+        const events = parseSSEEvents(response.body);
+
+        // Find output_text delta/done events and verify logprobs
+        const textDeltaEvents = events.filter(
+          (e) => e.data && e.data.type === 'response.output_text.delta',
+        );
+        const textDoneEvents = events.filter(
+          (e) => e.data && e.data.type === 'response.output_text.done',
+        );
+
+        // Should have at least one output_text event
+        expect(textDeltaEvents.length + textDoneEvents.length).toBeGreaterThan(0);
+
+        // All output_text.delta events must have logprobs array
+        for (const event of textDeltaEvents) {
+          expect(Array.isArray(event.data.logprobs)).toBe(true);
+        }
+
+        // All output_text.done events must have logprobs array
+        for (const event of textDoneEvents) {
+          expect(Array.isArray(event.data.logprobs)).toBe(true);
+        }
+      });
+    });
+
+    describe('system-prompt', () => {
+      it('should handle developer role messages in input (as system)', async () => {
+        // Note: For Anthropic, system messages must be first and there can only be one.
+        // Since the agent already has instructions, we use 'developer' role which
+        // gets merged into the system prompt, or we test with a simple user message
+        // that instructs the behavior.
+        const response = await authRequest()
+          .post('/api/agents/v1/responses')
+          .send({
+            model: testAgent.id,
+            input: [
+              {
+                type: 'message',
+                role: 'user',
+                content: 'Pretend you are a pirate and say hello in pirate speak.',
+              },
+            ],
+          });
+
+        expect(response.status).toBe(200);
+        expect(response.body.status).toBe('completed');
+        expect(response.body.output.length).toBeGreaterThan(0);
+
+        // The response should reflect the pirate persona
+        const messageItem = response.body.output.find((item) => item.type === 'message');
+        expect(messageItem).toBeDefined();
+        expect(messageItem.content.length).toBeGreaterThan(0);
+      });
+    });
+
+    describe('multi-turn', () => {
+      it('should handle multi-turn conversation history', async () => {
+        const response = await authRequest()
+          .post('/api/agents/v1/responses')
+          .send({
+            model: testAgent.id,
+            input: [
+              {
+                type: 'message',
+                role: 'user',
+                content: 'My name is Alice.',
+              },
+              {
+                type: 'message',
+                role: 'assistant',
+                content: 'Hello Alice! Nice to meet you. How can I help you today?',
+              },
+              {
+                type: 'message',
+                role: 'user',
+                content: 'What is my name?',
+              },
+            ],
+          });
+
+        expect(response.status).toBe(200);
+        expect(response.body.status).toBe('completed');
+
+        // The response should reference "Alice"
+        const messageItem = response.body.output.find((item) => item.type === 'message');
+        expect(messageItem).toBeDefined();
+
+        const textContent = messageItem.content.find((c) => c.type === 'output_text');
+        expect(textContent).toBeDefined();
+        expect(textContent.text.toLowerCase()).toContain('alice');
+      });
+    });
+
+    // Note: tool-calling test requires tool setup which may need additional configuration
+    // Note: image-input test requires vision-capable model
+
+    describe('string-input', () => {
+      it('should accept simple string input', async () => {
+        const response = await authRequest().post('/api/agents/v1/responses').send({
+          model: testAgent.id,
+          input: 'Hello!',
+        });
+
+        expect(response.status).toBe(200);
+        expect(response.body.status).toBe('completed');
+        expect(response.body.output.length).toBeGreaterThan(0);
+      });
+    });
+  });
+
+  /* ===========================================================================
+   * EXTENDED THINKING TESTS
+   * Tests reasoning output from Claude models with extended thinking enabled
+   * =========================================================================== */
+
+  describe('Extended Thinking', () => {
+    it('should return reasoning output when thinking is enabled', async () => {
+      const response = await authRequest()
+        .post('/api/agents/v1/responses')
+        .send({
+          model: thinkingAgent.id,
+          input: [
+            {
+              type: 'message',
+              role: 'user',
+              content: 'What is 15 * 7? Think step by step.',
+            },
+          ],
+        });
+
+      expect(response.status).toBe(200);
+      expect(response.body.status).toBe('completed');
+
+      // Check for reasoning item in output
+      const reasoningItem = response.body.output.find((item) => item.type === 'reasoning');
+      // If reasoning is present, validate its structure per Open Responses spec
+      // Note: reasoning items do NOT have a 'status' field per the spec
+      // @see https://github.com/openresponses/openresponses/blob/main/src/generated/kubb/zod/reasoningBodySchema.ts
+      if (reasoningItem) {
+        expect(reasoningItem).toHaveProperty('id');
+        expect(reasoningItem).toHaveProperty('type', 'reasoning');
+        // Note: 'status' is NOT a field on reasoning items per the spec
+        expect(reasoningItem).toHaveProperty('summary');
+        expect(Array.isArray(reasoningItem.summary)).toBe(true);
+
+        // Validate content items
+        if (reasoningItem.content && reasoningItem.content.length > 0) {
+          const reasoningContent = reasoningItem.content[0];
+          expect(reasoningContent).toHaveProperty('type', 'reasoning_text');
+          expect(reasoningContent).toHaveProperty('text');
+        }
+      }
+
+      const messageItem = response.body.output.find((item) => item.type === 'message');
+      expect(messageItem).toBeDefined();
+    });
+
+    it('should stream reasoning events when thinking is enabled', async () => {
+      const response = await authRequest()
+        .post('/api/agents/v1/responses')
+        .send({
+          model: thinkingAgent.id,
+          input: [
+            {
+              type: 'message',
+              role: 'user',
+              content: 'What is 12 + 8? Think step by step.',
+            },
+          ],
+          stream: true,
+        })
+        .buffer(true)
+        .parse((res, callback) => {
+          let data = '';
+          res.on('data', (chunk) => {
+            data += chunk.toString();
+          });
+          res.on('end', () => {
+            callback(null, data);
+          });
+        });
+
+      expect(response.status).toBe(200);
+
+      const events = parseSSEEvents(response.body);
+
+      // Validate all events against Open Responses spec
+      const validationErrors = validateAllStreamingEvents(events);
+      if (validationErrors.length > 0) {
+        console.error('Reasoning streaming event validation errors:', validationErrors);
+      }
+      expect(validationErrors).toEqual([]);
+
+      // Check for reasoning-related events using correct event types per Open Responses spec
+      // Note: The spec uses response.reasoning.delta NOT response.reasoning_text.delta
+      const reasoningDeltaEvents = events.filter(
+        (e) => e.data && e.data.type === 'response.reasoning.delta',
+      );
+      const reasoningDoneEvents = events.filter(
+        (e) => e.data && e.data.type === 'response.reasoning.done',
+      );
+
+      // If reasoning events are present, validate their structure
+      if (reasoningDeltaEvents.length > 0) {
+        const deltaEvent = reasoningDeltaEvents[0];
+        expect(deltaEvent.data).toHaveProperty('item_id');
+        expect(deltaEvent.data).toHaveProperty('delta');
+        expect(deltaEvent.data).toHaveProperty('output_index');
+        expect(deltaEvent.data).toHaveProperty('content_index');
+        expect(deltaEvent.data).toHaveProperty('sequence_number');
+      }
+
+      if (reasoningDoneEvents.length > 0) {
+        const doneEvent = reasoningDoneEvents[0];
+        expect(doneEvent.data).toHaveProperty('item_id');
+        expect(doneEvent.data).toHaveProperty('text');
+        expect(doneEvent.data).toHaveProperty('output_index');
+        expect(doneEvent.data).toHaveProperty('content_index');
+        expect(doneEvent.data).toHaveProperty('sequence_number');
+      }
+
+      // Verify stream completed properly
+      const eventTypes = events.map((e) => e.event);
+      expect(eventTypes).toContain('response.completed');
+    });
+  });
+
+  /* ===========================================================================
+   * SCHEMA VALIDATION TESTS
+   * Verify response schema compliance
+   * =========================================================================== */
+
+  describe('Schema Validation', () => {
+    it('should include all required fields in response', async () => {
+      const response = await authRequest().post('/api/agents/v1/responses').send({
+        model: testAgent.id,
+        input: 'Test',
+      });
+
+      expect(response.status).toBe(200);
+      const body = response.body;
+
+      // Required fields per Open Responses spec
+      expect(body).toHaveProperty('id');
+      expect(body).toHaveProperty('object', 'response');
+      expect(body).toHaveProperty('created_at');
+      expect(body).toHaveProperty('completed_at');
+      expect(body).toHaveProperty('status');
+      expect(body).toHaveProperty('model');
+      expect(body).toHaveProperty('output');
+      expect(body).toHaveProperty('tools');
+      expect(body).toHaveProperty('tool_choice');
+      expect(body).toHaveProperty('truncation');
+      expect(body).toHaveProperty('parallel_tool_calls');
+      expect(body).toHaveProperty('text');
+      expect(body).toHaveProperty('temperature');
+      expect(body).toHaveProperty('top_p');
+      expect(body).toHaveProperty('presence_penalty');
+      expect(body).toHaveProperty('frequency_penalty');
+      expect(body).toHaveProperty('top_logprobs');
+      expect(body).toHaveProperty('store');
+      expect(body).toHaveProperty('background');
+      expect(body).toHaveProperty('service_tier');
+      expect(body).toHaveProperty('metadata');
+
+      // top_logprobs must be a number (not null)
+      expect(typeof body.top_logprobs).toBe('number');
+
+      // Usage must have required detail fields
+      expect(body).toHaveProperty('usage');
+      expect(body.usage).toHaveProperty('input_tokens');
+      expect(body.usage).toHaveProperty('output_tokens');
+      expect(body.usage).toHaveProperty('total_tokens');
+      expect(body.usage).toHaveProperty('input_tokens_details');
+      expect(body.usage).toHaveProperty('output_tokens_details');
+      expect(body.usage.input_tokens_details).toHaveProperty('cached_tokens');
+      expect(body.usage.output_tokens_details).toHaveProperty('reasoning_tokens');
+    });
+
+    it('should have valid message item structure', async () => {
+      const response = await authRequest().post('/api/agents/v1/responses').send({
+        model: testAgent.id,
+        input: 'Hello',
+      });
+
+      expect(response.status).toBe(200);
+
+      const messageItem = response.body.output.find((item) => item.type === 'message');
+      expect(messageItem).toBeDefined();
+
+      // Message item required fields
+      expect(messageItem).toHaveProperty('type', 'message');
+      expect(messageItem).toHaveProperty('id');
+      expect(messageItem).toHaveProperty('status');
+      expect(messageItem).toHaveProperty('role', 'assistant');
+      expect(messageItem).toHaveProperty('content');
+      expect(Array.isArray(messageItem.content)).toBe(true);
+
+      // Content part structure - verify all required fields
+      if (messageItem.content.length > 0) {
+        const textContent = messageItem.content.find((c) => c.type === 'output_text');
+        if (textContent) {
+          expect(textContent).toHaveProperty('type', 'output_text');
+          expect(textContent).toHaveProperty('text');
+          expect(textContent).toHaveProperty('annotations');
+          expect(textContent).toHaveProperty('logprobs');
+          expect(Array.isArray(textContent.annotations)).toBe(true);
+          expect(Array.isArray(textContent.logprobs)).toBe(true);
+        }
+      }
+
+      // Verify reasoning item has required summary field
+      const reasoningItem = response.body.output.find((item) => item.type === 'reasoning');
+      if (reasoningItem) {
+        expect(reasoningItem).toHaveProperty('type', 'reasoning');
+        expect(reasoningItem).toHaveProperty('id');
+        expect(reasoningItem).toHaveProperty('summary');
+        expect(Array.isArray(reasoningItem.summary)).toBe(true);
+      }
+    });
+  });
+
+  /* ===========================================================================
+   * RESPONSE STORAGE TESTS
+   * Tests for store: true and GET /v1/responses/:id
+   * =========================================================================== */
+
+  describe('Response Storage', () => {
+    it('should store response when store: true and retrieve it', async () => {
+      // Create a stored response
+      const createResponse = await authRequest().post('/api/agents/v1/responses').send({
+        model: testAgent.id,
+        input: 'Remember this: The answer is 42.',
+        store: true,
+      });
+
+      expect(createResponse.status).toBe(200);
+      expect(createResponse.body.status).toBe('completed');
+
+      const responseId = createResponse.body.id;
+      expect(responseId).toMatch(/^resp_/);
+
+      // Small delay to ensure database write completes
+      await new Promise((resolve) => setTimeout(resolve, 500));
+
+      // Retrieve the stored response
+      const getResponseResult = await authRequest().get(`/api/agents/v1/responses/${responseId}`);
+
+      // Note: The response might be stored under conversationId, not responseId
+      // If we get 404, that's expected behavior for now since we store by conversationId
+      if (getResponseResult.status === 200) {
+        expect(getResponseResult.body.object).toBe('response');
+        expect(getResponseResult.body.status).toBe('completed');
+        expect(getResponseResult.body.output.length).toBeGreaterThan(0);
+      }
+    });
+
+    it('should return 404 for non-existent response', async () => {
+      const response = await authRequest().get('/api/agents/v1/responses/resp_nonexistent123');
+
+      expect(response.status).toBe(404);
+      expect(response.body.error).toBeDefined();
+    });
+  });
+
+  /* ===========================================================================
+   * ERROR HANDLING TESTS
+   * =========================================================================== */
+
+  describe('Error Handling', () => {
+    it('should return error for missing model', async () => {
+      const response = await authRequest().post('/api/agents/v1/responses').send({
+        input: 'Hello',
+      });
+
+      expect(response.status).toBe(400);
+      expect(response.body.error).toBeDefined();
+    });
+
+    it('should return error for missing input', async () => {
+      const response = await authRequest().post('/api/agents/v1/responses').send({
+        model: testAgent.id,
+      });
+
+      expect(response.status).toBe(400);
+      expect(response.body.error).toBeDefined();
+    });
+
+    it('should return error for non-existent agent', async () => {
+      const response = await authRequest().post('/api/agents/v1/responses').send({
+        model: 'agent_nonexistent123456789',
+        input: 'Hello',
+      });
+
+      expect(response.status).toBe(404);
+      expect(response.body.error).toBeDefined();
+    });
+  });
+
+  /* ===========================================================================
+   * MODELS ENDPOINT TESTS
+   * =========================================================================== */
+
+  describe('GET /v1/responses/models', () => {
+    it('should list available agents as models', async () => {
+      const response = await authRequest().get('/api/agents/v1/responses/models');
+
+      expect(response.status).toBe(200);
+      expect(response.body.object).toBe('list');
+      expect(Array.isArray(response.body.data)).toBe(true);
+
+      // Should include our test agent
+      const foundAgent = response.body.data.find((m) => m.id === testAgent.id);
+      expect(foundAgent).toBeDefined();
+      expect(foundAgent.object).toBe('model');
+      expect(foundAgent.name).toBe(testAgent.name);
+    });
+  });
+});
diff --git a/api/server/routes/agents/index.js b/api/server/routes/agents/index.js
index 6933a11534..f8d39cb4d8 100644
--- a/api/server/routes/agents/index.js
+++ b/api/server/routes/agents/index.js
@@ -9,6 +9,9 @@ const {
   configMiddleware,
   messageUserLimiter,
 } = require('~/server/middleware');
+const { saveMessage } = require('~/models');
+const openai = require('./openai');
+const responses = require('./responses');
 const { v1 } = require('./v1');
 const chat = require('./chat');
 
@@ -16,6 +19,20 @@ const { LIMIT_MESSAGE_IP, LIMIT_MESSAGE_USER } = process.env ?? {};
 
 const router = express.Router();
 
+/**
+ * Open Responses API routes (API key authentication handled in route file)
+ * Mounted at /agents/v1/responses (full path: /api/agents/v1/responses)
+ * NOTE: Must be mounted BEFORE /v1 to avoid being caught by the less specific route
+ * @see https://openresponses.org/specification
+ */
+router.use('/v1/responses', responses);
+
+/**
+ * OpenAI-compatible API routes (API key authentication handled in route file)
+ * Mounted at /agents/v1 (full path: /api/agents/v1/chat/completions)
+ */
+router.use('/v1', openai);
+
 router.use(requireJwtAuth);
 router.use(checkBan);
 router.use(uaParser);
@@ -46,6 +63,10 @@ router.get('/chat/stream/:streamId', async (req, res) => {
     });
   }
 
+  if (job.metadata?.userId && job.metadata.userId !== req.user.id) {
+    return res.status(403).json({ error: 'Unauthorized' });
+  }
+
   res.setHeader('Content-Encoding', 'identity');
   res.setHeader('Content-Type', 'text/event-stream');
   res.setHeader('Cache-Control', 'no-cache, no-transform');
@@ -194,9 +215,53 @@ router.post('/chat/abort', async (req, res) => {
   logger.debug(`[AgentStream] Computed jobStreamId: ${jobStreamId}`);
 
   if (job && jobStreamId) {
+    if (job.metadata?.userId && job.metadata.userId !== userId) {
+      logger.warn(`[AgentStream] Unauthorized abort attempt for ${jobStreamId} by user ${userId}`);
+      return res.status(403).json({ error: 'Unauthorized' });
+    }
+
     logger.debug(`[AgentStream] Job found, aborting: ${jobStreamId}`);
-    await GenerationJobManager.abortJob(jobStreamId);
-    logger.debug(`[AgentStream] Job aborted successfully: ${jobStreamId}`);
+    const abortResult = await GenerationJobManager.abortJob(jobStreamId);
+    logger.debug(`[AgentStream] Job aborted successfully: ${jobStreamId}`, {
+      abortResultSuccess: abortResult.success,
+      abortResultUserMessageId: abortResult.jobData?.userMessage?.messageId,
+      abortResultResponseMessageId: abortResult.jobData?.responseMessageId,
+    });
+
+    // CRITICAL: Save partial response BEFORE returning to prevent race condition.
+    // If user sends a follow-up immediately after abort, the parentMessageId must exist in DB.
+    // Only save if we have a valid responseMessageId (skip early aborts before generation started)
+    if (
+      abortResult.success &&
+      abortResult.jobData?.userMessage?.messageId &&
+      abortResult.jobData?.responseMessageId
+    ) {
+      const { jobData, content, text } = abortResult;
+      const responseMessage = {
+        messageId: jobData.responseMessageId,
+        parentMessageId: jobData.userMessage.messageId,
+        conversationId: jobData.conversationId,
+        content: content || [],
+        text: text || '',
+        sender: jobData.sender || 'AI',
+        endpoint: jobData.endpoint,
+        model: jobData.model,
+        unfinished: true,
+        error: false,
+        isCreatedByUser: false,
+        user: userId,
+      };
+
+      try {
+        await saveMessage(req, responseMessage, {
+          context: 'api/server/routes/agents/index.js - abort endpoint',
+        });
+        logger.debug(`[AgentStream] Saved partial response for: ${jobStreamId}`);
+      } catch (saveError) {
+        logger.error(`[AgentStream] Failed to save partial response: ${saveError.message}`);
+      }
+    }
+
     return res.json({ success: true, aborted: jobStreamId });
   }
 
diff --git a/api/server/routes/agents/openai.js b/api/server/routes/agents/openai.js
new file mode 100644
index 0000000000..9a0d9a3564
--- /dev/null
+++ b/api/server/routes/agents/openai.js
@@ -0,0 +1,110 @@
+/**
+ * OpenAI-compatible API routes for LibreChat agents.
+ *
+ * Provides a /v1/chat/completions compatible interface for
+ * interacting with LibreChat agents remotely via API.
+ *
+ * Usage:
+ *   POST /v1/chat/completions - Chat with an agent
+ *   GET /v1/models - List available agents
+ *   GET /v1/models/:model - Get agent details
+ *
+ * Request format:
+ *   {
+ *     "model": "agent_id_here",
+ *     "messages": [{"role": "user", "content": "Hello!"}],
+ *     "stream": true
+ *   }
+ */
+const express = require('express');
+const { PermissionTypes, Permissions } = require('librechat-data-provider');
+const {
+  generateCheckAccess,
+  createRequireApiKeyAuth,
+  createCheckRemoteAgentAccess,
+} = require('@librechat/api');
+const {
+  OpenAIChatCompletionController,
+  ListModelsController,
+  GetModelController,
+} = require('~/server/controllers/agents/openai');
+const { getEffectivePermissions } = require('~/server/services/PermissionService');
+const { validateAgentApiKey, findUser } = require('~/models');
+const { configMiddleware } = require('~/server/middleware');
+const { getRoleByName } = require('~/models/Role');
+const { getAgent } = require('~/models/Agent');
+
+const router = express.Router();
+
+const requireApiKeyAuth = createRequireApiKeyAuth({
+  validateAgentApiKey,
+  findUser,
+});
+
+const checkRemoteAgentsFeature = generateCheckAccess({
+  permissionType: PermissionTypes.REMOTE_AGENTS,
+  permissions: [Permissions.USE],
+  getRoleByName,
+});
+
+const checkAgentPermission = createCheckRemoteAgentAccess({
+  getAgent,
+  getEffectivePermissions,
+});
+
+router.use(requireApiKeyAuth);
+router.use(configMiddleware);
+router.use(checkRemoteAgentsFeature);
+
+/**
+ * @route POST /v1/chat/completions
+ * @desc OpenAI-compatible chat completions with agents
+ * @access Private (API key auth required)
+ *
+ * Request body:
+ * {
+ *   "model": "agent_id",        // Required: The agent ID to use
+ *   "messages": [...],          // Required: Array of chat messages
+ *   "stream": true,             // Optional: Whether to stream (default: false)
+ *   "conversation_id": "...",   // Optional: Conversation ID for context
+ *   "parent_message_id": "..."  // Optional: Parent message for threading
+ * }
+ *
+ * Response (streaming):
+ * - SSE stream with OpenAI chat.completion.chunk format
+ * - Includes delta.reasoning for thinking/reasoning content
+ *
+ * Response (non-streaming):
+ * - Standard OpenAI chat.completion format
+ */
+router.post('/chat/completions', checkAgentPermission, OpenAIChatCompletionController);
+
+/**
+ * @route GET /v1/models
+ * @desc List available agents as models
+ * @access Private (API key auth required)
+ *
+ * Response:
+ * {
+ *   "object": "list",
+ *   "data": [
+ *     {
+ *       "id": "agent_id",
+ *       "object": "model",
+ *       "name": "Agent Name",
+ *       "provider": "openai",
+ *       ...
+ *     }
+ *   ]
+ * }
+ */
+router.get('/models', ListModelsController);
+
+/**
+ * @route GET /v1/models/:model
+ * @desc Get details for a specific agent/model
+ * @access Private (API key auth required)
+ */
+router.get('/models/:model', GetModelController);
+
+module.exports = router;
diff --git a/api/server/routes/agents/responses.js b/api/server/routes/agents/responses.js
new file mode 100644
index 0000000000..431942e921
--- /dev/null
+++ b/api/server/routes/agents/responses.js
@@ -0,0 +1,144 @@
+/**
+ * Open Responses API routes for LibreChat agents.
+ *
+ * Implements the Open Responses specification for a forward-looking,
+ * agentic API that uses items as the fundamental unit and semantic
+ * streaming events.
+ *
+ * Usage:
+ *   POST /v1/responses - Create a response
+ *   GET /v1/models - List available agents
+ *
+ * Request format:
+ *   {
+ *     "model": "agent_id_here",
+ *     "input": "Hello!" or [{ type: "message", role: "user", content: "Hello!" }],
+ *     "stream": true,
+ *     "previous_response_id": "optional_conversation_id"
+ *   }
+ *
+ * @see https://openresponses.org/specification
+ */
+const express = require('express');
+const { PermissionTypes, Permissions } = require('librechat-data-provider');
+const {
+  generateCheckAccess,
+  createRequireApiKeyAuth,
+  createCheckRemoteAgentAccess,
+} = require('@librechat/api');
+const {
+  createResponse,
+  getResponse,
+  listModels,
+} = require('~/server/controllers/agents/responses');
+const { getEffectivePermissions } = require('~/server/services/PermissionService');
+const { validateAgentApiKey, findUser } = require('~/models');
+const { configMiddleware } = require('~/server/middleware');
+const { getRoleByName } = require('~/models/Role');
+const { getAgent } = require('~/models/Agent');
+
+const router = express.Router();
+
+const requireApiKeyAuth = createRequireApiKeyAuth({
+  validateAgentApiKey,
+  findUser,
+});
+
+const checkRemoteAgentsFeature = generateCheckAccess({
+  permissionType: PermissionTypes.REMOTE_AGENTS,
+  permissions: [Permissions.USE],
+  getRoleByName,
+});
+
+const checkAgentPermission = createCheckRemoteAgentAccess({
+  getAgent,
+  getEffectivePermissions,
+});
+
+router.use(requireApiKeyAuth);
+router.use(configMiddleware);
+router.use(checkRemoteAgentsFeature);
+
+/**
+ * @route POST /v1/responses
+ * @desc Create a model response following Open Responses specification
+ * @access Private (API key auth required)
+ *
+ * Request body:
+ * {
+ *   "model": "agent_id",                // Required: The agent ID to use
+ *   "input": "..." | [...],             // Required: String or array of input items
+ *   "stream": true,                     // Optional: Whether to stream (default: false)
+ *   "previous_response_id": "...",      // Optional: Previous response for continuation
+ *   "instructions": "...",              // Optional: Additional instructions
+ *   "tools": [...],                     // Optional: Additional tools
+ *   "tool_choice": "auto",              // Optional: Tool choice mode
+ *   "max_output_tokens": 4096,          // Optional: Max tokens
+ *   "temperature": 0.7                  // Optional: Temperature
+ * }
+ *
+ * Response (streaming):
+ * - SSE stream with semantic events:
+ *   - response.in_progress
+ *   - response.output_item.added
+ *   - response.content_part.added
+ *   - response.output_text.delta
+ *   - response.output_text.done
+ *   - response.function_call_arguments.delta
+ *   - response.output_item.done
+ *   - response.completed
+ *   - [DONE]
+ *
+ * Response (non-streaming):
+ * {
+ *   "id": "resp_xxx",
+ *   "object": "response",
+ *   "created_at": 1234567890,
+ *   "status": "completed",
+ *   "model": "agent_id",
+ *   "output": [...],                    // Array of output items
+ *   "usage": { ... }
+ * }
+ */
+router.post('/', checkAgentPermission, createResponse);
+
+/**
+ * @route GET /v1/responses/models
+ * @desc List available agents as models
+ * @access Private (API key auth required)
+ *
+ * Response:
+ * {
+ *   "object": "list",
+ *   "data": [
+ *     {
+ *       "id": "agent_id",
+ *       "object": "model",
+ *       "name": "Agent Name",
+ *       "provider": "openai",
+ *       ...
+ *     }
+ *   ]
+ * }
+ */
+router.get('/models', listModels);
+
+/**
+ * @route GET /v1/responses/:id
+ * @desc Retrieve a stored response by ID
+ * @access Private (API key auth required)
+ *
+ * Response:
+ * {
+ *   "id": "resp_xxx",
+ *   "object": "response",
+ *   "created_at": 1234567890,
+ *   "status": "completed",
+ *   "model": "agent_id",
+ *   "output": [...],
+ *   "usage": { ... }
+ * }
+ */
+router.get('/:id', getResponse);
+
+module.exports = router;
diff --git a/api/server/routes/apiKeys.js b/api/server/routes/apiKeys.js
new file mode 100644
index 0000000000..29dcc326f5
--- /dev/null
+++ b/api/server/routes/apiKeys.js
@@ -0,0 +1,36 @@
+const express = require('express');
+const { generateCheckAccess, createApiKeyHandlers } = require('@librechat/api');
+const { PermissionTypes, Permissions } = require('librechat-data-provider');
+const {
+  getAgentApiKeyById,
+  createAgentApiKey,
+  deleteAgentApiKey,
+  listAgentApiKeys,
+} = require('~/models');
+const { requireJwtAuth } = require('~/server/middleware');
+const { getRoleByName } = require('~/models/Role');
+
+const router = express.Router();
+
+const handlers = createApiKeyHandlers({
+  createAgentApiKey,
+  listAgentApiKeys,
+  deleteAgentApiKey,
+  getAgentApiKeyById,
+});
+
+const checkRemoteAgentsUse = generateCheckAccess({
+  permissionType: PermissionTypes.REMOTE_AGENTS,
+  permissions: [Permissions.USE],
+  getRoleByName,
+});
+
+router.post('/', requireJwtAuth, checkRemoteAgentsUse, handlers.createApiKey);
+
+router.get('/', requireJwtAuth, checkRemoteAgentsUse, handlers.listApiKeys);
+
+router.get('/:id', requireJwtAuth, checkRemoteAgentsUse, handlers.getApiKey);
+
+router.delete('/:id', requireJwtAuth, checkRemoteAgentsUse, handlers.deleteApiKey);
+
+module.exports = router;
diff --git a/api/server/routes/convos.js b/api/server/routes/convos.js
index 75b3656f59..bb9c4ebea9 100644
--- a/api/server/routes/convos.js
+++ b/api/server/routes/convos.js
@@ -98,7 +98,7 @@ router.get('/gen_title/:conversationId', async (req, res) => {
 
 router.delete('/', async (req, res) => {
   let filter = {};
-  const { conversationId, source, thread_id, endpoint } = req.body.arg;
+  const { conversationId, source, thread_id, endpoint } = req.body?.arg ?? {};
 
   // Prevent deletion of all conversations
   if (!conversationId && !source && !thread_id && !endpoint) {
@@ -160,7 +160,7 @@ router.delete('/all', async (req, res) => {
  * @returns {object} 200 - The updated conversation object.
  */
 router.post('/archive', validateConvoAccess, async (req, res) => {
-  const { conversationId, isArchived } = req.body.arg ?? {};
+  const { conversationId, isArchived } = req.body?.arg ?? {};
 
   if (!conversationId) {
     return res.status(400).json({ error: 'conversationId is required' });
@@ -194,7 +194,7 @@ const MAX_CONVO_TITLE_LENGTH = 1024;
  * @returns {object} 201 - The updated conversation object.
  */
 router.post('/update', validateConvoAccess, async (req, res) => {
-  const { conversationId, title } = req.body.arg ?? {};
+  const { conversationId, title } = req.body?.arg ?? {};
 
   if (!conversationId) {
     return res.status(400).json({ error: 'conversationId is required' });
diff --git a/api/server/routes/files/images.js b/api/server/routes/files/images.js
index b8be413f4f..8072612a69 100644
--- a/api/server/routes/files/images.js
+++ b/api/server/routes/files/images.js
@@ -2,11 +2,11 @@ const path = require('path');
 const fs = require('fs').promises;
 const express = require('express');
 const { logger } = require('@librechat/data-schemas');
-const { isAgentsEndpoint } = require('librechat-data-provider');
+const { isAssistantsEndpoint } = require('librechat-data-provider');
 const {
-  filterFile,
-  processImageFile,
   processAgentFileUpload,
+  processImageFile,
+  filterFile,
 } = require('~/server/services/Files/process');
 
 const router = express.Router();
@@ -21,7 +21,7 @@ router.post('/', async (req, res) => {
     metadata.temp_file_id = metadata.file_id;
     metadata.file_id = req.file_id;
 
-    if (isAgentsEndpoint(metadata.endpoint) && metadata.tool_resource != null) {
+    if (!isAssistantsEndpoint(metadata.endpoint) && metadata.tool_resource != null) {
       return await processAgentFileUpload({ req, res, metadata });
     }
 
diff --git a/api/server/routes/index.js b/api/server/routes/index.js
index f3571099cb..6a48919db3 100644
--- a/api/server/routes/index.js
+++ b/api/server/routes/index.js
@@ -1,6 +1,7 @@
 const accessPermissions = require('./accessPermissions');
 const assistants = require('./assistants');
 const categories = require('./categories');
+const adminAuth = require('./admin/auth');
 const endpoints = require('./endpoints');
 const staticRoute = require('./static');
 const messages = require('./messages');
@@ -9,6 +10,7 @@ const presets = require('./presets');
 const prompts = require('./prompts');
 const balance = require('./balance');
 const actions = require('./actions');
+const apiKeys = require('./apiKeys');
 const banner = require('./banner');
 const search = require('./search');
 const models = require('./models');
@@ -28,7 +30,9 @@ const mcp = require('./mcp');
 module.exports = {
   mcp,
   auth,
+  adminAuth,
   keys,
+  apiKeys,
   user,
   tags,
   roles,
diff --git a/api/server/routes/keys.js b/api/server/routes/keys.js
index 620e4d234b..dfd68f69c4 100644
--- a/api/server/routes/keys.js
+++ b/api/server/routes/keys.js
@@ -5,7 +5,11 @@ const { requireJwtAuth } = require('~/server/middleware');
 const router = express.Router();
 
 router.put('/', requireJwtAuth, async (req, res) => {
-  await updateUserKey({ userId: req.user.id, ...req.body });
+  if (req.body == null || typeof req.body !== 'object') {
+    return res.status(400).send({ error: 'Invalid request body.' });
+  }
+  const { name, value, expiresAt } = req.body;
+  await updateUserKey({ userId: req.user.id, name, value, expiresAt });
   res.status(201).send();
 });
 
diff --git a/api/server/routes/mcp.js b/api/server/routes/mcp.js
index f01c7ff71c..2db8c2c462 100644
--- a/api/server/routes/mcp.js
+++ b/api/server/routes/mcp.js
@@ -8,18 +8,32 @@ const {
   Permissions,
 } = require('librechat-data-provider');
 const {
+  getBasePath,
   createSafeUser,
   MCPOAuthHandler,
   MCPTokenStorage,
-  getBasePath,
+  setOAuthSession,
   getUserMCPAuthMap,
+  validateOAuthCsrf,
+  OAUTH_CSRF_COOKIE,
+  setOAuthCsrfCookie,
   generateCheckAccess,
+  validateOAuthSession,
+  OAUTH_SESSION_COOKIE,
 } = require('@librechat/api');
 const {
-  getMCPManager,
-  getFlowStateManager,
+  createMCPServerController,
+  updateMCPServerController,
+  deleteMCPServerController,
+  getMCPServersList,
+  getMCPServerById,
+  getMCPTools,
+} = require('~/server/controllers/mcp');
+const {
   getOAuthReconnectionManager,
   getMCPServersRegistry,
+  getFlowStateManager,
+  getMCPManager,
 } = require('~/config');
 const { getMCPSetupData, getServerConnectionStatus } = require('~/server/services/MCP');
 const { requireJwtAuth, canAccessMCPServerResource } = require('~/server/middleware');
@@ -27,20 +41,14 @@ const { findToken, updateToken, createToken, deleteTokens } = require('~/models'
 const { getUserPluginAuthValue } = require('~/server/services/PluginService');
 const { updateMCPServerTools } = require('~/server/services/Config/mcp');
 const { reinitMCPServer } = require('~/server/services/Tools/mcp');
-const { getMCPTools } = require('~/server/controllers/mcp');
 const { findPluginAuthsByKeys } = require('~/models');
 const { getRoleByName } = require('~/models/Role');
 const { getLogStores } = require('~/cache');
-const {
-  createMCPServerController,
-  getMCPServerById,
-  getMCPServersList,
-  updateMCPServerController,
-  deleteMCPServerController,
-} = require('~/server/controllers/mcp');
 
 const router = Router();
 
+const OAUTH_CSRF_COOKIE_PATH = '/api/mcp';
+
 /**
  * Get all MCP tools available to the user
  * Returns only MCP tools, completely decoupled from regular LibreChat tools
@@ -53,7 +61,7 @@ router.get('/tools', requireJwtAuth, async (req, res) => {
  * Initiate OAuth flow
  * This endpoint is called when the user clicks the auth link in the UI
  */
-router.get('/:serverName/oauth/initiate', requireJwtAuth, async (req, res) => {
+router.get('/:serverName/oauth/initiate', requireJwtAuth, setOAuthSession, async (req, res) => {
   try {
     const { serverName } = req.params;
     const { userId, flowId } = req.query;
@@ -93,7 +101,7 @@ router.get('/:serverName/oauth/initiate', requireJwtAuth, async (req, res) => {
 
     logger.debug('[MCP OAuth] OAuth flow initiated', { oauthFlowId, authorizationUrl });
 
-    // Redirect user to the authorization URL
+    setOAuthCsrfCookie(res, oauthFlowId, OAUTH_CSRF_COOKIE_PATH);
     res.redirect(authorizationUrl);
   } catch (error) {
     logger.error('[MCP OAuth] Failed to initiate OAuth', error);
@@ -138,6 +146,25 @@ router.get('/:serverName/oauth/callback', async (req, res) => {
     const flowId = state;
     logger.debug('[MCP OAuth] Using flow ID from state', { flowId });
 
+    const flowParts = flowId.split(':');
+    if (flowParts.length < 2 || !flowParts[0] || !flowParts[1]) {
+      logger.error('[MCP OAuth] Invalid flow ID format in state', { flowId });
+      return res.redirect(`${basePath}/oauth/error?error=invalid_state`);
+    }
+
+    const [flowUserId] = flowParts;
+    if (
+      !validateOAuthCsrf(req, res, flowId, OAUTH_CSRF_COOKIE_PATH) &&
+      !validateOAuthSession(req, flowUserId)
+    ) {
+      logger.error('[MCP OAuth] CSRF validation failed: no valid CSRF or session cookie', {
+        flowId,
+        hasCsrfCookie: !!req.cookies?.[OAUTH_CSRF_COOKIE],
+        hasSessionCookie: !!req.cookies?.[OAUTH_SESSION_COOKIE],
+      });
+      return res.redirect(`${basePath}/oauth/error?error=csrf_validation_failed`);
+    }
+
     const flowsCache = getLogStores(CacheKeys.FLOWS);
     const flowManager = getFlowStateManager(flowsCache);
 
@@ -302,13 +329,47 @@ router.get('/oauth/tokens/:flowId', requireJwtAuth, async (req, res) => {
   }
 });
 
+/**
+ * Set CSRF binding cookie for OAuth flows initiated outside of HTTP request/response
+ * (e.g. during chat via SSE). The frontend should call this before opening the OAuth URL
+ * so the callback can verify the browser matches the flow initiator.
+ */
+router.post('/:serverName/oauth/bind', requireJwtAuth, setOAuthSession, async (req, res) => {
+  try {
+    const { serverName } = req.params;
+    const user = req.user;
+
+    if (!user?.id) {
+      return res.status(401).json({ error: 'User not authenticated' });
+    }
+
+    const flowId = MCPOAuthHandler.generateFlowId(user.id, serverName);
+    setOAuthCsrfCookie(res, flowId, OAUTH_CSRF_COOKIE_PATH);
+
+    res.json({ success: true });
+  } catch (error) {
+    logger.error('[MCP OAuth] Failed to set CSRF binding cookie', error);
+    res.status(500).json({ error: 'Failed to bind OAuth flow' });
+  }
+});
+
 /**
  * Check OAuth flow status
  * This endpoint can be used to poll the status of an OAuth flow
  */
-router.get('/oauth/status/:flowId', async (req, res) => {
+router.get('/oauth/status/:flowId', requireJwtAuth, async (req, res) => {
   try {
     const { flowId } = req.params;
+    const user = req.user;
+
+    if (!user?.id) {
+      return res.status(401).json({ error: 'User not authenticated' });
+    }
+
+    if (!flowId.startsWith(`${user.id}:`) && !flowId.startsWith('system:')) {
+      return res.status(403).json({ error: 'Access denied' });
+    }
+
     const flowsCache = getLogStores(CacheKeys.FLOWS);
     const flowManager = getFlowStateManager(flowsCache);
 
@@ -375,7 +436,7 @@ router.post('/oauth/cancel/:serverName', requireJwtAuth, async (req, res) => {
  * Reinitialize MCP server
  * This endpoint allows reinitializing a specific MCP server
  */
-router.post('/:serverName/reinitialize', requireJwtAuth, async (req, res) => {
+router.post('/:serverName/reinitialize', requireJwtAuth, setOAuthSession, async (req, res) => {
   try {
     const { serverName } = req.params;
     const user = createSafeUser(req.user);
@@ -421,6 +482,11 @@ router.post('/:serverName/reinitialize', requireJwtAuth, async (req, res) => {
 
     const { success, message, oauthRequired, oauthUrl } = result;
 
+    if (oauthRequired) {
+      const flowId = MCPOAuthHandler.generateFlowId(user.id, serverName);
+      setOAuthCsrfCookie(res, flowId, OAUTH_CSRF_COOKIE_PATH);
+    }
+
     res.json({
       success,
       message,
diff --git a/api/server/routes/oauth.js b/api/server/routes/oauth.js
index 64d29210ac..f4bb5b6026 100644
--- a/api/server/routes/oauth.js
+++ b/api/server/routes/oauth.js
@@ -4,10 +4,9 @@ const passport = require('passport');
 const { randomState } = require('openid-client');
 const { logger } = require('@librechat/data-schemas');
 const { ErrorTypes } = require('librechat-data-provider');
-const { isEnabled, createSetBalanceConfig } = require('@librechat/api');
-const { checkDomainAllowed, loginLimiter, logHeaders, checkBan } = require('~/server/middleware');
-const { syncUserEntraGroupMemberships } = require('~/server/services/PermissionService');
-const { setAuthTokens, setOpenIDAuthTokens } = require('~/server/services/AuthService');
+const { createSetBalanceConfig } = require('@librechat/api');
+const { checkDomainAllowed, loginLimiter, logHeaders } = require('~/server/middleware');
+const { createOAuthHandler } = require('~/server/controllers/auth/oauth');
 const { getAppConfig } = require('~/server/services/Config');
 const { Balance } = require('~/db/models');
 
@@ -26,36 +25,11 @@ const domains = {
 router.use(logHeaders);
 router.use(loginLimiter);
 
-const oauthHandler = async (req, res, next) => {
-  try {
-    if (res.headersSent) {
-      return;
-    }
-
-    await checkBan(req, res);
-    if (req.banned) {
-      return;
-    }
-    if (
-      req.user &&
-      req.user.provider == 'openid' &&
-      isEnabled(process.env.OPENID_REUSE_TOKENS) === true
-    ) {
-      await syncUserEntraGroupMemberships(req.user, req.user.tokenset.access_token);
-      setOpenIDAuthTokens(req.user.tokenset, req, res, req.user._id.toString());
-    } else {
-      await setAuthTokens(req.user._id, res);
-    }
-    res.redirect(domains.client);
-  } catch (err) {
-    logger.error('Error in setting authentication tokens:', err);
-    next(err);
-  }
-};
+const oauthHandler = createOAuthHandler();
 
 router.get('/error', (req, res) => {
   /** A single error message is pushed by passport when authentication fails. */
-  const errorMessage = req.session?.messages?.pop() || 'Unknown error';
+  const errorMessage = req.session?.messages?.pop() || 'Unknown OAuth error';
   logger.error('Error in OAuth authentication:', {
     message: errorMessage,
   });
diff --git a/api/server/routes/roles.js b/api/server/routes/roles.js
index abb53141bd..12e18c7624 100644
--- a/api/server/routes/roles.js
+++ b/api/server/routes/roles.js
@@ -6,9 +6,10 @@ const {
   agentPermissionsSchema,
   promptPermissionsSchema,
   memoryPermissionsSchema,
+  mcpServersPermissionsSchema,
   marketplacePermissionsSchema,
   peoplePickerPermissionsSchema,
-  mcpServersPermissionsSchema,
+  remoteAgentsPermissionsSchema,
 } = require('librechat-data-provider');
 const { checkAdmin, requireJwtAuth } = require('~/server/middleware');
 const { updateRoleByName, getRoleByName } = require('~/models/Role');
@@ -51,6 +52,11 @@ const permissionConfigs = {
     permissionType: PermissionTypes.MARKETPLACE,
     errorMessage: 'Invalid marketplace permissions.',
   },
+  'remote-agents': {
+    schema: remoteAgentsPermissionsSchema,
+    permissionType: PermissionTypes.REMOTE_AGENTS,
+    errorMessage: 'Invalid remote agents permissions.',
+  },
 };
 
 /**
@@ -160,4 +166,10 @@ router.put('/:roleName/mcp-servers', checkAdmin, createPermissionUpdateHandler('
  */
 router.put('/:roleName/marketplace', checkAdmin, createPermissionUpdateHandler('marketplace'));
 
+/**
+ * PUT /api/roles/:roleName/remote-agents
+ * Update remote agents (API) permissions for a specific role
+ */
+router.put('/:roleName/remote-agents', checkAdmin, createPermissionUpdateHandler('remote-agents'));
+
 module.exports = router;
diff --git a/api/server/services/ActionService.js b/api/server/services/ActionService.js
index a2a515d14a..5e96726a46 100644
--- a/api/server/services/ActionService.js
+++ b/api/server/services/ActionService.js
@@ -8,6 +8,7 @@ const {
   logAxiosError,
   refreshAccessToken,
   GenerationJobManager,
+  createSSRFSafeAgents,
 } = require('@librechat/api');
 const {
   Time,
@@ -133,6 +134,7 @@ async function loadActionSets(searchParams) {
  * @param {import('zod').ZodTypeAny | undefined} [params.zodSchema] - The Zod schema for tool input validation/definition
  * @param {{ oauth_client_id?: string; oauth_client_secret?: string; }} params.encrypted - The encrypted values for the action.
  * @param {string | null} [params.streamId] - The stream ID for resumable streams.
+ * @param {boolean} [params.useSSRFProtection] - When true, uses SSRF-safe HTTP agents that validate resolved IPs at connect time.
  * @returns { Promise<typeof tool | { _call: (toolInput: Object | string) => unknown}> } An object with `_call` method to execute the tool input.
  */
 async function createActionTool({
@@ -145,7 +147,9 @@ async function createActionTool({
   description,
   encrypted,
   streamId = null,
+  useSSRFProtection = false,
 }) {
+  const ssrfAgents = useSSRFProtection ? createSSRFSafeAgents() : undefined;
   /** @type {(toolInput: Object | string, config: GraphRunnableConfig) => Promise<unknown>} */
   const _call = async (toolInput, config) => {
     try {
@@ -201,7 +205,7 @@ async function createActionTool({
                   async () => {
                     const eventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
                     if (streamId) {
-                      GenerationJobManager.emitChunk(streamId, eventData);
+                      await GenerationJobManager.emitChunk(streamId, eventData);
                     } else {
                       sendEvent(res, eventData);
                     }
@@ -231,7 +235,7 @@ async function createActionTool({
                 data.delta.expires_at = undefined;
                 const successEventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
                 if (streamId) {
-                  GenerationJobManager.emitChunk(streamId, successEventData);
+                  await GenerationJobManager.emitChunk(streamId, successEventData);
                 } else {
                   sendEvent(res, successEventData);
                 }
@@ -324,7 +328,7 @@ async function createActionTool({
         }
       }
 
-      const response = await preparedExecutor.execute();
+      const response = await preparedExecutor.execute(ssrfAgents);
 
       if (typeof response.data === 'object') {
         return JSON.stringify(response.data);
diff --git a/api/server/services/Artifacts/update.js b/api/server/services/Artifacts/update.js
index d068593f8c..be1644b11c 100644
--- a/api/server/services/Artifacts/update.js
+++ b/api/server/services/Artifacts/update.js
@@ -73,15 +73,25 @@ const replaceArtifactContent = (originalText, artifact, original, updated) => {
     return null;
   }
 
-  // Check if there are code blocks
-  const codeBlockStart = artifactContent.indexOf('```\n', contentStart);
+  // Check if there are code blocks - handle both ```\n and ```lang\n formats
+  let codeBlockStart = artifactContent.indexOf('```', contentStart);
   const codeBlockEnd = artifactContent.lastIndexOf('\n```', contentEnd);
 
+  // If we found opening backticks, find the actual newline (skipping any language identifier)
+  if (codeBlockStart !== -1) {
+    const newlineAfterBackticks = artifactContent.indexOf('\n', codeBlockStart);
+    if (newlineAfterBackticks !== -1 && newlineAfterBackticks < contentEnd) {
+      codeBlockStart = newlineAfterBackticks;
+    } else {
+      codeBlockStart = -1;
+    }
+  }
+
   // Determine where to look for the original content
   let searchStart, searchEnd;
   if (codeBlockStart !== -1) {
-    // Code block starts
-    searchStart = codeBlockStart + 4; // after ```\n
+    // Code block starts - searchStart is right after the newline following ```[lang]
+    searchStart = codeBlockStart + 1; // after the newline
 
     if (codeBlockEnd !== -1 && codeBlockEnd > codeBlockStart) {
       // Code block has proper ending
diff --git a/api/server/services/Artifacts/update.spec.js b/api/server/services/Artifacts/update.spec.js
index 2a3e0bbe39..39a4f02863 100644
--- a/api/server/services/Artifacts/update.spec.js
+++ b/api/server/services/Artifacts/update.spec.js
@@ -494,5 +494,268 @@ ${original}`;
         /```\n {2}function test\(\) \{\n {4}return \{\n {6}value: 100\n {4}\};\n {2}\}\n```/,
       );
     });
+
+    test('should handle code blocks with language identifiers (```svg, ```html, etc.)', () => {
+      const svgContent = `<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
+  <rect width="200" height="200" fill="#4A90A4"/>
+  <rect x="50" y="50" width="100" height="100" fill="#FFFFFF"/>
+</svg>`;
+
+      /** Artifact with language identifier in code block */
+      const artifactText = `${ARTIFACT_START}{identifier="test-svg" type="image/svg+xml" title="Test SVG"}
+\`\`\`svg
+${svgContent}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+      expect(artifacts).toHaveLength(1);
+
+      const updatedSvg = svgContent.replace('#FFFFFF', '#131313');
+      const result = replaceArtifactContent(artifactText, artifacts[0], svgContent, updatedSvg);
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('#131313');
+      expect(result).not.toContain('#FFFFFF');
+      expect(result).toMatch(/```svg\n/);
+    });
+
+    test('should handle code blocks with complex language identifiers', () => {
+      const htmlContent = `<!DOCTYPE html>
+<html>
+<head><title>Test</title></head>
+<body>Hello</body>
+</html>`;
+
+      const artifactText = `${ARTIFACT_START}{identifier="test-html" type="text/html" title="Test HTML"}
+\`\`\`html
+${htmlContent}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const updatedHtml = htmlContent.replace('Hello', 'Updated');
+      const result = replaceArtifactContent(artifactText, artifacts[0], htmlContent, updatedHtml);
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('Updated');
+      expect(result).toMatch(/```html\n/);
+    });
+  });
+
+  describe('code block edge cases', () => {
+    test('should handle code block without language identifier (```\\n)', () => {
+      const content = 'const x = 1;\nconst y = 2;';
+      const artifactText = `${ARTIFACT_START}{identifier="test" type="text/plain" title="Test"}
+\`\`\`
+${content}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const result = replaceArtifactContent(artifactText, artifacts[0], content, 'updated');
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('updated');
+      expect(result).toMatch(/```\nupdated\n```/);
+    });
+
+    test('should handle various language identifiers', () => {
+      const languages = [
+        'javascript',
+        'typescript',
+        'python',
+        'jsx',
+        'tsx',
+        'css',
+        'json',
+        'xml',
+        'markdown',
+        'md',
+      ];
+
+      for (const lang of languages) {
+        const content = `test content for ${lang}`;
+        const artifactText = `${ARTIFACT_START}{identifier="test-${lang}" type="text/plain" title="Test"}
+\`\`\`${lang}
+${content}
+\`\`\`
+${ARTIFACT_END}`;
+
+        const message = { text: artifactText };
+        const artifacts = findAllArtifacts(message);
+        expect(artifacts).toHaveLength(1);
+
+        const result = replaceArtifactContent(artifactText, artifacts[0], content, 'updated');
+
+        expect(result).not.toBeNull();
+        expect(result).toContain('updated');
+        expect(result).toMatch(new RegExp(`\`\`\`${lang}\\n`));
+      }
+    });
+
+    test('should handle single character language identifier', () => {
+      const content = 'single char lang';
+      const artifactText = `${ARTIFACT_START}{identifier="test" type="text/plain" title="Test"}
+\`\`\`r
+${content}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const result = replaceArtifactContent(artifactText, artifacts[0], content, 'updated');
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('updated');
+      expect(result).toMatch(/```r\n/);
+    });
+
+    test('should handle code block with content that looks like code fence', () => {
+      const content = 'Line 1\nSome text with ``` backticks in middle\nLine 3';
+      const artifactText = `${ARTIFACT_START}{identifier="test" type="text/plain" title="Test"}
+\`\`\`text
+${content}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const result = replaceArtifactContent(artifactText, artifacts[0], content, 'updated');
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('updated');
+    });
+
+    test('should handle code block with trailing whitespace in language line', () => {
+      const content = 'whitespace test';
+      /** Note: trailing spaces after 'python' */
+      const artifactText = `${ARTIFACT_START}{identifier="test" type="text/plain" title="Test"}
+\`\`\`python   
+${content}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const result = replaceArtifactContent(artifactText, artifacts[0], content, 'updated');
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('updated');
+    });
+
+    test('should handle react/jsx content with complex syntax', () => {
+      const jsxContent = `function App() {
+  const [count, setCount] = useState(0);
+  return (
+    <div className="app">
+      <h1>Count: {count}</h1>
+      <button onClick={() => setCount(c => c + 1)}>
+        Increment
+      </button>
+    </div>
+  );
+}`;
+
+      const artifactText = `${ARTIFACT_START}{identifier="react-app" type="application/vnd.react" title="React App"}
+\`\`\`jsx
+${jsxContent}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const updatedJsx = jsxContent.replace('Increment', 'Click me');
+      const result = replaceArtifactContent(artifactText, artifacts[0], jsxContent, updatedJsx);
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('Click me');
+      expect(result).not.toContain('Increment');
+      expect(result).toMatch(/```jsx\n/);
+    });
+
+    test('should handle mermaid diagram content', () => {
+      const mermaidContent = `graph TD
+    A[Start] --> B{Is it?}
+    B -->|Yes| C[OK]
+    B -->|No| D[End]`;
+
+      const artifactText = `${ARTIFACT_START}{identifier="diagram" type="application/vnd.mermaid" title="Flow"}
+\`\`\`mermaid
+${mermaidContent}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const updatedMermaid = mermaidContent.replace('Start', 'Begin');
+      const result = replaceArtifactContent(
+        artifactText,
+        artifacts[0],
+        mermaidContent,
+        updatedMermaid,
+      );
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('Begin');
+      expect(result).toMatch(/```mermaid\n/);
+    });
+
+    test('should handle artifact without code block (plain text)', () => {
+      const content = 'Just plain text without code fences';
+      const artifactText = `${ARTIFACT_START}{identifier="plain" type="text/plain" title="Plain"}
+${content}
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const result = replaceArtifactContent(
+        artifactText,
+        artifacts[0],
+        content,
+        'updated plain text',
+      );
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('updated plain text');
+      expect(result).not.toContain('```');
+    });
+
+    test('should handle multiline content with various newline patterns', () => {
+      const content = `Line 1
+Line 2
+
+Line 4 after empty line
+  Indented line
+    Double indented`;
+
+      const artifactText = `${ARTIFACT_START}{identifier="test" type="text/plain" title="Test"}
+\`\`\`
+${content}
+\`\`\`
+${ARTIFACT_END}`;
+
+      const message = { text: artifactText };
+      const artifacts = findAllArtifacts(message);
+
+      const updated = content.replace('Line 1', 'First Line');
+      const result = replaceArtifactContent(artifactText, artifacts[0], content, updated);
+
+      expect(result).not.toBeNull();
+      expect(result).toContain('First Line');
+      expect(result).toContain('  Indented line');
+      expect(result).toContain('    Double indented');
+    });
   });
 });
diff --git a/api/server/services/AuthService.js b/api/server/services/AuthService.js
index a400bce8b7..ef50a365b9 100644
--- a/api/server/services/AuthService.js
+++ b/api/server/services/AuthService.js
@@ -7,7 +7,13 @@ const {
   DEFAULT_REFRESH_TOKEN_EXPIRY,
 } = require('@librechat/data-schemas');
 const { ErrorTypes, SystemRoles, errorsToString } = require('librechat-data-provider');
-const { isEnabled, checkEmailConfig, isEmailDomainAllowed, math } = require('@librechat/api');
+const {
+  math,
+  isEnabled,
+  checkEmailConfig,
+  isEmailDomainAllowed,
+  shouldUseSecureCookie,
+} = require('@librechat/api');
 const {
   findUser,
   findToken,
@@ -33,7 +39,6 @@ const domains = {
   server: process.env.DOMAIN_SERVER,
 };
 
-const isProduction = process.env.NODE_ENV === 'production';
 const genericVerificationMessage = 'Please check your email to verify your email address.';
 
 /**
@@ -392,13 +397,13 @@ const setAuthTokens = async (userId, res, _session = null) => {
     res.cookie('refreshToken', refreshToken, {
       expires: new Date(refreshTokenExpires),
       httpOnly: true,
-      secure: isProduction,
+      secure: shouldUseSecureCookie(),
       sameSite: 'strict',
     });
     res.cookie('token_provider', 'librechat', {
       expires: new Date(refreshTokenExpires),
       httpOnly: true,
-      secure: isProduction,
+      secure: shouldUseSecureCookie(),
       sameSite: 'strict',
     });
     return token;
@@ -419,7 +424,7 @@ const setAuthTokens = async (userId, res, _session = null) => {
  * @param {Object} req - request object (for session access)
  * @param {Object} res - response object
  * @param {string} [userId] - Optional MongoDB user ID for image path validation
- * @returns {String} - access token
+ * @returns {String} - id_token (preferred) or access_token as the app auth token
  */
 const setOpenIDAuthTokens = (tokenset, req, res, userId, existingRefreshToken) => {
   try {
@@ -448,34 +453,62 @@ const setOpenIDAuthTokens = (tokenset, req, res, userId, existingRefreshToken) =
       return;
     }
 
+    /**
+     * Use id_token as the app authentication token (Bearer token for JWKS validation).
+     * The id_token is always a standard JWT signed by the IdP's JWKS keys with the app's
+     * client_id as audience. The access_token may be opaque or intended for a different
+     * audience (e.g., Microsoft Graph API), which fails JWKS validation.
+     * Falls back to access_token for providers where id_token is not available.
+     */
+    const appAuthToken = tokenset.id_token || tokenset.access_token;
+
+    /**
+     * Always set refresh token cookie so it survives express session expiry.
+     * The session cookie maxAge (SESSION_EXPIRY, default 15 min) is typically shorter
+     * than the OIDC token lifetime (~1 hour). Without this cookie fallback, the refresh
+     * token stored only in the session is lost when the session expires, causing the user
+     * to be signed out on the next token refresh attempt.
+     * The refresh token is small (opaque string) so it doesn't hit the HTTP/2 header
+     * size limits that motivated session storage for the larger access_token/id_token.
+     */
+    res.cookie('refreshToken', refreshToken, {
+      expires: expirationDate,
+      httpOnly: true,
+      secure: shouldUseSecureCookie(),
+      sameSite: 'strict',
+    });
+
     /** Store tokens server-side in session to avoid large cookies */
     if (req.session) {
       req.session.openidTokens = {
         accessToken: tokenset.access_token,
+        idToken: tokenset.id_token,
         refreshToken: refreshToken,
         expiresAt: expirationDate.getTime(),
       };
     } else {
       logger.warn('[setOpenIDAuthTokens] No session available, falling back to cookies');
-      res.cookie('refreshToken', refreshToken, {
-        expires: expirationDate,
-        httpOnly: true,
-        secure: isProduction,
-        sameSite: 'strict',
-      });
       res.cookie('openid_access_token', tokenset.access_token, {
         expires: expirationDate,
         httpOnly: true,
-        secure: isProduction,
+        secure: shouldUseSecureCookie(),
         sameSite: 'strict',
       });
+      if (tokenset.id_token) {
+        res.cookie('openid_id_token', tokenset.id_token, {
+          expires: expirationDate,
+          httpOnly: true,
+          secure: shouldUseSecureCookie(),
+          sameSite: 'strict',
+        });
+      }
     }
 
     /** Small cookie to indicate token provider (required for auth middleware) */
     res.cookie('token_provider', 'openid', {
       expires: expirationDate,
       httpOnly: true,
-      secure: isProduction,
+      secure: shouldUseSecureCookie(),
       sameSite: 'strict',
     });
     if (userId && isEnabled(process.env.OPENID_REUSE_TOKENS)) {
@@ -486,11 +519,11 @@ const setOpenIDAuthTokens = (tokenset, req, res, userId, existingRefreshToken) =
       res.cookie('openid_user_id', signedUserId, {
         expires: expirationDate,
         httpOnly: true,
-        secure: isProduction,
+        secure: shouldUseSecureCookie(),
         sameSite: 'strict',
       });
     }
-    return tokenset.access_token;
+    return appAuthToken;
   } catch (error) {
     logger.error('[setOpenIDAuthTokens] Error in setting authentication tokens:', error);
     throw error;
diff --git a/api/server/services/AuthService.spec.js b/api/server/services/AuthService.spec.js
new file mode 100644
index 0000000000..da78f8d775
--- /dev/null
+++ b/api/server/services/AuthService.spec.js
@@ -0,0 +1,269 @@
+jest.mock('@librechat/data-schemas', () => ({
+  logger: { info: jest.fn(), warn: jest.fn(), debug: jest.fn(), error: jest.fn() },
+  DEFAULT_SESSION_EXPIRY: 900000,
+  DEFAULT_REFRESH_TOKEN_EXPIRY: 604800000,
+}));
+jest.mock('librechat-data-provider', () => ({
+  ErrorTypes: {},
+  SystemRoles: { USER: 'USER', ADMIN: 'ADMIN' },
+  errorsToString: jest.fn(),
+}));
+jest.mock('@librechat/api', () => ({
+  isEnabled: jest.fn((val) => val === 'true' || val === true),
+  checkEmailConfig: jest.fn(),
+  isEmailDomainAllowed: jest.fn(),
+  math: jest.fn((val, fallback) => (val ? Number(val) : fallback)),
+  shouldUseSecureCookie: jest.fn(() => false),
+}));
+jest.mock('~/models', () => ({
+  findUser: jest.fn(),
+  findToken: jest.fn(),
+  createUser: jest.fn(),
+  updateUser: jest.fn(),
+  countUsers: jest.fn(),
+  getUserById: jest.fn(),
+  findSession: jest.fn(),
+  createToken: jest.fn(),
+  deleteTokens: jest.fn(),
+  deleteSession: jest.fn(),
+  createSession: jest.fn(),
+  generateToken: jest.fn(),
+  deleteUserById: jest.fn(),
+  generateRefreshToken: jest.fn(),
+}));
+jest.mock('~/strategies/validators', () => ({ registerSchema: { parse: jest.fn() } }));
+jest.mock('~/server/services/Config', () => ({ getAppConfig: jest.fn() }));
+jest.mock('~/server/utils', () => ({ sendEmail: jest.fn() }));
+
+const { shouldUseSecureCookie } = require('@librechat/api');
+const { setOpenIDAuthTokens } = require('./AuthService');
+
+/** Helper to build a mock Express response */
+function mockResponse() {
+  const cookies = {};
+  const res = {
+    cookie: jest.fn((name, value, options) => {
+      cookies[name] = { value, options };
+    }),
+    _cookies: cookies,
+  };
+  return res;
+}
+
+/** Helper to build a mock Express request with session */
+function mockRequest(sessionData = {}) {
+  return {
+    session: { openidTokens: null, ...sessionData },
+  };
+}
+
+describe('setOpenIDAuthTokens', () => {
+  const env = process.env;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    process.env = {
+      ...env,
+      JWT_REFRESH_SECRET: 'test-refresh-secret',
+      OPENID_REUSE_TOKENS: 'true',
+    };
+  });
+
+  afterAll(() => {
+    process.env = env;
+  });
+
+  describe('token selection (id_token vs access_token)', () => {
+    it('should return id_token when both id_token and access_token are present', () => {
+      const tokenset = {
+        id_token: 'the-id-token',
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+      expect(result).toBe('the-id-token');
+    });
+
+    it('should return access_token when id_token is not available', () => {
+      const tokenset = {
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+      expect(result).toBe('the-access-token');
+    });
+
+    it('should return access_token when id_token is undefined', () => {
+      const tokenset = {
+        id_token: undefined,
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+      expect(result).toBe('the-access-token');
+    });
+
+    it('should return access_token when id_token is null', () => {
+      const tokenset = {
+        id_token: null,
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+      expect(result).toBe('the-access-token');
+    });
+
+    it('should return id_token even when id_token and access_token differ', () => {
+      const tokenset = {
+        id_token: 'id-token-jwt-signed-by-idp',
+        access_token: 'opaque-graph-api-token',
+        refresh_token: 'refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+      expect(result).toBe('id-token-jwt-signed-by-idp');
+      expect(result).not.toBe('opaque-graph-api-token');
+    });
+  });
+
+  describe('session token storage', () => {
+    it('should store the original access_token in session (not id_token)', () => {
+      const tokenset = {
+        id_token: 'the-id-token',
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+
+      expect(req.session.openidTokens.accessToken).toBe('the-access-token');
+      expect(req.session.openidTokens.refreshToken).toBe('the-refresh-token');
+    });
+  });
+
+  describe('cookie secure flag', () => {
+    it('should call shouldUseSecureCookie for every cookie set', () => {
+      const tokenset = {
+        id_token: 'the-id-token',
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+
+      // token_provider + openid_user_id (session path, so no refreshToken/openid_access_token cookies)
+      const secureCalls = shouldUseSecureCookie.mock.calls.length;
+      expect(secureCalls).toBeGreaterThanOrEqual(2);
+
+      // Verify all cookies use the result of shouldUseSecureCookie
+      for (const [, cookie] of Object.entries(res._cookies)) {
+        expect(cookie.options.secure).toBe(false);
+      }
+    });
+
+    it('should set secure: true when shouldUseSecureCookie returns true', () => {
+      shouldUseSecureCookie.mockReturnValue(true);
+
+      const tokenset = {
+        id_token: 'the-id-token',
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+
+      for (const [, cookie] of Object.entries(res._cookies)) {
+        expect(cookie.options.secure).toBe(true);
+      }
+    });
+
+    it('should use shouldUseSecureCookie for cookie fallback path (no session)', () => {
+      shouldUseSecureCookie.mockReturnValue(false);
+
+      const tokenset = {
+        id_token: 'the-id-token',
+        access_token: 'the-access-token',
+        refresh_token: 'the-refresh-token',
+      };
+      const req = { session: null };
+      const res = mockResponse();
+
+      setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+
+      // In the cookie fallback path, we get: refreshToken, openid_access_token, token_provider, openid_user_id
+      expect(res.cookie).toHaveBeenCalledWith(
+        'refreshToken',
+        expect.any(String),
+        expect.objectContaining({ secure: false }),
+      );
+      expect(res.cookie).toHaveBeenCalledWith(
+        'openid_access_token',
+        expect.any(String),
+        expect.objectContaining({ secure: false }),
+      );
+      expect(res.cookie).toHaveBeenCalledWith(
+        'token_provider',
+        'openid',
+        expect.objectContaining({ secure: false }),
+      );
+    });
+  });
+
+  describe('edge cases', () => {
+    it('should return undefined when tokenset is null', () => {
+      const req = mockRequest();
+      const res = mockResponse();
+      const result = setOpenIDAuthTokens(null, req, res, 'user-123');
+      expect(result).toBeUndefined();
+    });
+
+    it('should return undefined when access_token is missing', () => {
+      const tokenset = { refresh_token: 'refresh' };
+      const req = mockRequest();
+      const res = mockResponse();
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+      expect(result).toBeUndefined();
+    });
+
+    it('should return undefined when no refresh token is available', () => {
+      const tokenset = { access_token: 'access', id_token: 'id' };
+      const req = mockRequest();
+      const res = mockResponse();
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123');
+      expect(result).toBeUndefined();
+    });
+
+    it('should use existingRefreshToken when tokenset has no refresh_token', () => {
+      const tokenset = {
+        id_token: 'the-id-token',
+        access_token: 'the-access-token',
+      };
+      const req = mockRequest();
+      const res = mockResponse();
+
+      const result = setOpenIDAuthTokens(tokenset, req, res, 'user-123', 'existing-refresh');
+      expect(result).toBe('the-id-token');
+      expect(req.session.openidTokens.refreshToken).toBe('existing-refresh');
+    });
+  });
+});
diff --git a/api/server/services/Config/__tests__/getCachedTools.spec.js b/api/server/services/Config/__tests__/getCachedTools.spec.js
index 48ab6e0737..38d488ed38 100644
--- a/api/server/services/Config/__tests__/getCachedTools.spec.js
+++ b/api/server/services/Config/__tests__/getCachedTools.spec.js
@@ -1,10 +1,92 @@
-const { ToolCacheKeys } = require('../getCachedTools');
+const { CacheKeys } = require('librechat-data-provider');
+
+jest.mock('~/cache/getLogStores');
+const getLogStores = require('~/cache/getLogStores');
+
+const mockCache = { get: jest.fn(), set: jest.fn(), delete: jest.fn() };
+getLogStores.mockReturnValue(mockCache);
+
+const {
+  ToolCacheKeys,
+  getCachedTools,
+  setCachedTools,
+  getMCPServerTools,
+  invalidateCachedTools,
+} = require('../getCachedTools');
+
+describe('getCachedTools', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    getLogStores.mockReturnValue(mockCache);
+  });
 
-describe('getCachedTools - Cache Isolation Security', () => {
   describe('ToolCacheKeys.MCP_SERVER', () => {
     it('should generate cache keys that include userId', () => {
       const key = ToolCacheKeys.MCP_SERVER('user123', 'github');
       expect(key).toBe('tools:mcp:user123:github');
     });
   });
+
+  describe('TOOL_CACHE namespace usage', () => {
+    it('getCachedTools should use TOOL_CACHE namespace', async () => {
+      mockCache.get.mockResolvedValue(null);
+      await getCachedTools();
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+    });
+
+    it('getCachedTools with MCP server options should use TOOL_CACHE namespace', async () => {
+      mockCache.get.mockResolvedValue({ tool1: {} });
+      await getCachedTools({ userId: 'user1', serverName: 'github' });
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+      expect(mockCache.get).toHaveBeenCalledWith(ToolCacheKeys.MCP_SERVER('user1', 'github'));
+    });
+
+    it('setCachedTools should use TOOL_CACHE namespace', async () => {
+      mockCache.set.mockResolvedValue(true);
+      const tools = { tool1: { type: 'function' } };
+      await setCachedTools(tools);
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+      expect(mockCache.set).toHaveBeenCalledWith(ToolCacheKeys.GLOBAL, tools, expect.any(Number));
+    });
+
+    it('setCachedTools with MCP server options should use TOOL_CACHE namespace', async () => {
+      mockCache.set.mockResolvedValue(true);
+      const tools = { tool1: { type: 'function' } };
+      await setCachedTools(tools, { userId: 'user1', serverName: 'github' });
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+      expect(mockCache.set).toHaveBeenCalledWith(
+        ToolCacheKeys.MCP_SERVER('user1', 'github'),
+        tools,
+        expect.any(Number),
+      );
+    });
+
+    it('invalidateCachedTools should use TOOL_CACHE namespace', async () => {
+      mockCache.delete.mockResolvedValue(true);
+      await invalidateCachedTools({ invalidateGlobal: true });
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+      expect(mockCache.delete).toHaveBeenCalledWith(ToolCacheKeys.GLOBAL);
+    });
+
+    it('getMCPServerTools should use TOOL_CACHE namespace', async () => {
+      mockCache.get.mockResolvedValue(null);
+      await getMCPServerTools('user1', 'github');
+      expect(getLogStores).toHaveBeenCalledWith(CacheKeys.TOOL_CACHE);
+      expect(mockCache.get).toHaveBeenCalledWith(ToolCacheKeys.MCP_SERVER('user1', 'github'));
+    });
+
+    it('should NOT use CONFIG_STORE namespace', async () => {
+      mockCache.get.mockResolvedValue(null);
+      await getCachedTools();
+      await getMCPServerTools('user1', 'github');
+      mockCache.set.mockResolvedValue(true);
+      await setCachedTools({ tool1: {} });
+      mockCache.delete.mockResolvedValue(true);
+      await invalidateCachedTools({ invalidateGlobal: true });
+
+      const allCalls = getLogStores.mock.calls.flat();
+      expect(allCalls).not.toContain(CacheKeys.CONFIG_STORE);
+      expect(allCalls.every((key) => key === CacheKeys.TOOL_CACHE)).toBe(true);
+    });
+  });
 });
diff --git a/api/server/services/Config/getCachedTools.js b/api/server/services/Config/getCachedTools.js
index cf1618a646..eb7a08305a 100644
--- a/api/server/services/Config/getCachedTools.js
+++ b/api/server/services/Config/getCachedTools.js
@@ -20,7 +20,7 @@ const ToolCacheKeys = {
  * @returns {Promise<LCAvailableTools|null>} The available tools object or null if not cached
  */
 async function getCachedTools(options = {}) {
-  const cache = getLogStores(CacheKeys.CONFIG_STORE);
+  const cache = getLogStores(CacheKeys.TOOL_CACHE);
   const { userId, serverName } = options;
 
   // Return MCP server-specific tools if requested
@@ -43,7 +43,7 @@ async function getCachedTools(options = {}) {
  * @returns {Promise<boolean>} Whether the operation was successful
  */
 async function setCachedTools(tools, options = {}) {
-  const cache = getLogStores(CacheKeys.CONFIG_STORE);
+  const cache = getLogStores(CacheKeys.TOOL_CACHE);
   const { userId, serverName, ttl = Time.TWELVE_HOURS } = options;
 
   // Cache by MCP server if specified (requires userId)
@@ -65,7 +65,7 @@ async function setCachedTools(tools, options = {}) {
  * @returns {Promise<void>}
  */
 async function invalidateCachedTools(options = {}) {
-  const cache = getLogStores(CacheKeys.CONFIG_STORE);
+  const cache = getLogStores(CacheKeys.TOOL_CACHE);
   const { userId, serverName, invalidateGlobal = false } = options;
 
   const keysToDelete = [];
@@ -89,7 +89,7 @@ async function invalidateCachedTools(options = {}) {
  * @returns {Promise<LCAvailableTools|null>} The available tools for the server
  */
 async function getMCPServerTools(userId, serverName) {
-  const cache = getLogStores(CacheKeys.CONFIG_STORE);
+  const cache = getLogStores(CacheKeys.TOOL_CACHE);
   const serverTools = await cache.get(ToolCacheKeys.MCP_SERVER(userId, serverName));
 
   if (serverTools) {
diff --git a/api/server/services/Config/loadConfigModels.js b/api/server/services/Config/loadConfigModels.js
index 6354d10331..2bc83ecc3a 100644
--- a/api/server/services/Config/loadConfigModels.js
+++ b/api/server/services/Config/loadConfigModels.js
@@ -28,6 +28,11 @@ async function loadConfigModels(req) {
     modelsConfig[EModelEndpoint.azureAssistants] = azureConfig.assistantModels;
   }
 
+  const bedrockConfig = appConfig.endpoints?.[EModelEndpoint.bedrock];
+  if (bedrockConfig?.models && Array.isArray(bedrockConfig.models)) {
+    modelsConfig[EModelEndpoint.bedrock] = bedrockConfig.models;
+  }
+
   if (!Array.isArray(appConfig.endpoints?.[EModelEndpoint.custom])) {
     return modelsConfig;
   }
diff --git a/api/server/services/Config/mcp.js b/api/server/services/Config/mcp.js
index 15ea62a028..cc4e98b59e 100644
--- a/api/server/services/Config/mcp.js
+++ b/api/server/services/Config/mcp.js
@@ -35,7 +35,7 @@ async function updateMCPServerTools({ userId, serverName, tools }) {
 
     await setCachedTools(serverTools, { userId, serverName });
 
-    const cache = getLogStores(CacheKeys.CONFIG_STORE);
+    const cache = getLogStores(CacheKeys.TOOL_CACHE);
     await cache.delete(CacheKeys.TOOLS);
     logger.debug(
       `[MCP Cache] Updated ${tools.length} tools for server ${serverName} (user: ${userId})`,
@@ -61,7 +61,7 @@ async function mergeAppTools(appTools) {
     const cachedTools = await getCachedTools();
     const mergedTools = { ...cachedTools, ...appTools };
     await setCachedTools(mergedTools);
-    const cache = getLogStores(CacheKeys.CONFIG_STORE);
+    const cache = getLogStores(CacheKeys.TOOL_CACHE);
     await cache.delete(CacheKeys.TOOLS);
     logger.debug(`Merged ${count} app-level tools`);
   } catch (error) {
diff --git a/api/server/services/Endpoints/agents/addedConvo.js b/api/server/services/Endpoints/agents/addedConvo.js
index 240622ed9f..7e9385267a 100644
--- a/api/server/services/Endpoints/agents/addedConvo.js
+++ b/api/server/services/Endpoints/agents/addedConvo.js
@@ -31,6 +31,7 @@ setGetAgent(getAgent);
  * @param {Function} params.loadTools - Function to load agent tools
  * @param {Array} params.requestFiles - Request files
  * @param {string} params.conversationId - The conversation ID
+ * @param {string} [params.parentMessageId] - The parent message ID for thread filtering
  * @param {Set} params.allowedProviders - Set of allowed providers
  * @param {Map} params.agentConfigs - Map of agent configs to add to
  * @param {string} params.primaryAgentId - The primary agent ID
@@ -46,6 +47,7 @@ const processAddedConvo = async ({
   loadTools,
   requestFiles,
   conversationId,
+  parentMessageId,
   allowedProviders,
   agentConfigs,
   primaryAgentId,
@@ -91,6 +93,7 @@ const processAddedConvo = async ({
         loadTools,
         requestFiles,
         conversationId,
+        parentMessageId,
         agent: addedAgent,
         endpointOption,
         allowedProviders,
@@ -99,9 +102,12 @@ const processAddedConvo = async ({
         getConvoFiles,
         getFiles: db.getFiles,
         getUserKey: db.getUserKey,
+        getMessages: db.getMessages,
         updateFilesUsage: db.updateFilesUsage,
+        getUserCodeFiles: db.getUserCodeFiles,
         getUserKeyValues: db.getUserKeyValues,
         getToolFilesByIds: db.getToolFilesByIds,
+        getCodeGeneratedFiles: db.getCodeGeneratedFiles,
       },
     );
 
diff --git a/api/server/services/Endpoints/agents/initialize.js b/api/server/services/Endpoints/agents/initialize.js
index 626beed153..0888f23cd5 100644
--- a/api/server/services/Endpoints/agents/initialize.js
+++ b/api/server/services/Endpoints/agents/initialize.js
@@ -3,10 +3,11 @@ const { createContentAggregator } = require('@librechat/agents');
 const {
   initializeAgent,
   validateAgentModel,
-  getCustomEndpointConfig,
-  createSequentialChainEdges,
   createEdgeCollector,
   filterOrphanedEdges,
+  GenerationJobManager,
+  getCustomEndpointConfig,
+  createSequentialChainEdges,
 } = require('@librechat/api');
 const {
   EModelEndpoint,
@@ -18,8 +19,8 @@ const {
   createToolEndCallback,
   getDefaultHandlers,
 } = require('~/server/controllers/agents/callbacks');
+const { loadAgentTools, loadToolsForExecution } = require('~/server/services/ToolService');
 const { getModelsConfig } = require('~/server/controllers/ModelController');
-const { loadAgentTools } = require('~/server/services/ToolService');
 const AgentClient = require('~/server/controllers/agents/client');
 const { getConvoFiles } = require('~/models/Conversation');
 const { processAddedConvo } = require('./addedConvo');
@@ -31,8 +32,10 @@ const db = require('~/models');
  * Creates a tool loader function for the agent.
  * @param {AbortSignal} signal - The abort signal
  * @param {string | null} [streamId] - The stream ID for resumable mode
+ * @param {boolean} [definitionsOnly=false] - When true, returns only serializable
+ *   tool definitions without creating full tool instances (for event-driven mode)
  */
-function createToolLoader(signal, streamId = null) {
+function createToolLoader(signal, streamId = null, definitionsOnly = false) {
   /**
    * @param {object} params
    * @param {ServerRequest} params.req
@@ -43,21 +46,33 @@ function createToolLoader(signal, streamId = null) {
    * @param {string} params.model
    * @param {AgentToolResources} params.tool_resources
    * @returns {Promise<{
-   * tools: StructuredTool[],
-   * toolContextMap: Record<string, unknown>,
-   * userMCPAuthMap?: Record<string, Record<string, string>>
+   *   tools?: StructuredTool[],
+   *   toolContextMap: Record<string, unknown>,
+   *   toolDefinitions?: import('@librechat/agents').LCTool[],
+   *   userMCPAuthMap?: Record<string, Record<string, string>>,
+   *   toolRegistry?: import('@librechat/agents').LCToolRegistry
    * } | undefined>}
    */
-  return async function loadTools({ req, res, agentId, tools, provider, model, tool_resources }) {
-    const agent = { id: agentId, tools, provider, model };
+  return async function loadTools({
+    req,
+    res,
+    tools,
+    model,
+    agentId,
+    provider,
+    tool_options,
+    tool_resources,
+  }) {
+    const agent = { id: agentId, tools, provider, model, tool_options };
     try {
       return await loadAgentTools({
         req,
         res,
         agent,
         signal,
-        tool_resources,
         streamId,
+        tool_resources,
+        definitionsOnly,
       });
     } catch (error) {
       logger.error('Error loading tools for agent ' + agentId, error);
@@ -80,8 +95,47 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
   const artifactPromises = [];
   const { contentParts, aggregateContent } = createContentAggregator();
   const toolEndCallback = createToolEndCallback({ req, res, artifactPromises, streamId });
+
+  /**
+   * Agent context store - populated after initialization, accessed by callback via closure.
+   * Maps agentId -> { userMCPAuthMap, agent, tool_resources, toolRegistry, openAIApiKey }
+   * @type {Map<string, {
+   *   userMCPAuthMap?: Record<string, Record<string, string>>,
+   *   agent?: object,
+   *   tool_resources?: object,
+   *   toolRegistry?: import('@librechat/agents').LCToolRegistry,
+   *   openAIApiKey?: string
+   * }>}
+   */
+  const agentToolContexts = new Map();
+
+  const toolExecuteOptions = {
+    loadTools: async (toolNames, agentId) => {
+      const ctx = agentToolContexts.get(agentId) ?? {};
+      logger.debug(`[ON_TOOL_EXECUTE] ctx found: ${!!ctx.userMCPAuthMap}, agent: ${ctx.agent?.id}`);
+      logger.debug(`[ON_TOOL_EXECUTE] toolRegistry size: ${ctx.toolRegistry?.size ?? 'undefined'}`);
+
+      const result = await loadToolsForExecution({
+        req,
+        res,
+        signal,
+        streamId,
+        toolNames,
+        agent: ctx.agent,
+        toolRegistry: ctx.toolRegistry,
+        userMCPAuthMap: ctx.userMCPAuthMap,
+        tool_resources: ctx.tool_resources,
+      });
+
+      logger.debug(`[ON_TOOL_EXECUTE] loaded ${result.loadedTools?.length ?? 0} tools`);
+      return result;
+    },
+    toolEndCallback,
+  };
+
   const eventHandlers = getDefaultHandlers({
     res,
+    toolExecuteOptions,
     aggregateContent,
     toolEndCallback,
     collectedUsage,
@@ -114,11 +168,14 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
   const agentConfigs = new Map();
   const allowedProviders = new Set(appConfig?.endpoints?.[EModelEndpoint.agents]?.allowedProviders);
 
-  const loadTools = createToolLoader(signal, streamId);
+  /** Event-driven mode: only load tool definitions, not full instances */
+  const loadTools = createToolLoader(signal, streamId, true);
   /** @type {Array<MongoFile>} */
   const requestFiles = req.body.files ?? [];
   /** @type {string} */
   const conversationId = req.body.conversationId;
+  /** @type {string | undefined} */
+  const parentMessageId = req.body.parentMessageId;
 
   const primaryConfig = await initializeAgent(
     {
@@ -127,6 +184,7 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
       loadTools,
       requestFiles,
       conversationId,
+      parentMessageId,
       agent: primaryAgent,
       endpointOption,
       allowedProviders,
@@ -136,12 +194,31 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
       getConvoFiles,
       getFiles: db.getFiles,
       getUserKey: db.getUserKey,
+      getMessages: db.getMessages,
       updateFilesUsage: db.updateFilesUsage,
       getUserKeyValues: db.getUserKeyValues,
+      getUserCodeFiles: db.getUserCodeFiles,
       getToolFilesByIds: db.getToolFilesByIds,
+      getCodeGeneratedFiles: db.getCodeGeneratedFiles,
     },
   );
 
+  logger.debug(
+    `[initializeClient] Tool definitions for primary agent: ${primaryConfig.toolDefinitions?.length ?? 0}`,
+  );
+
+  /** Store primary agent's tool context for ON_TOOL_EXECUTE callback */
+  logger.debug(`[initializeClient] Storing tool context for agentId: ${primaryConfig.id}`);
+  logger.debug(
+    `[initializeClient] toolRegistry size: ${primaryConfig.toolRegistry?.size ?? 'undefined'}`,
+  );
+  agentToolContexts.set(primaryConfig.id, {
+    agent: primaryAgent,
+    toolRegistry: primaryConfig.toolRegistry,
+    userMCPAuthMap: primaryConfig.userMCPAuthMap,
+    tool_resources: primaryConfig.tool_resources,
+  });
+
   const agent_ids = primaryConfig.agent_ids;
   let userMCPAuthMap = primaryConfig.userMCPAuthMap;
 
@@ -178,6 +255,7 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
         loadTools,
         requestFiles,
         conversationId,
+        parentMessageId,
         endpointOption,
         allowedProviders,
       },
@@ -185,16 +263,29 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
         getConvoFiles,
         getFiles: db.getFiles,
         getUserKey: db.getUserKey,
+        getMessages: db.getMessages,
         updateFilesUsage: db.updateFilesUsage,
         getUserKeyValues: db.getUserKeyValues,
+        getUserCodeFiles: db.getUserCodeFiles,
         getToolFilesByIds: db.getToolFilesByIds,
+        getCodeGeneratedFiles: db.getCodeGeneratedFiles,
       },
     );
+
     if (userMCPAuthMap != null) {
       Object.assign(userMCPAuthMap, config.userMCPAuthMap ?? {});
     } else {
       userMCPAuthMap = config.userMCPAuthMap;
     }
+
+    /** Store handoff agent's tool context for ON_TOOL_EXECUTE callback */
+    agentToolContexts.set(agentId, {
+      agent,
+      toolRegistry: config.toolRegistry,
+      userMCPAuthMap: config.userMCPAuthMap,
+      tool_resources: config.tool_resources,
+    });
+
     agentConfigs.set(agentId, config);
     return agent;
   }
@@ -242,17 +333,18 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
   const { userMCPAuthMap: updatedMCPAuthMap } = await processAddedConvo({
     req,
     res,
-    endpointOption,
-    modelsConfig,
-    logViolation,
     loadTools,
+    logViolation,
+    modelsConfig,
     requestFiles,
-    conversationId,
-    allowedProviders,
     agentConfigs,
-    primaryAgentId: primaryConfig.id,
     primaryAgent,
+    endpointOption,
     userMCPAuthMap,
+    conversationId,
+    parentMessageId,
+    allowedProviders,
+    primaryAgentId: primaryConfig.id,
   });
 
   if (updatedMCPAuthMap) {
@@ -314,6 +406,10 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
     endpoint: isEphemeralAgentId(primaryConfig.id) ? primaryConfig.endpoint : EModelEndpoint.agents,
   });
 
+  if (streamId) {
+    GenerationJobManager.setCollectedUsage(streamId, collectedUsage);
+  }
+
   return { client, userMCPAuthMap };
 };
 
diff --git a/api/server/services/Endpoints/agents/title.js b/api/server/services/Endpoints/agents/title.js
index 1d6d359bd6..e31cdeea11 100644
--- a/api/server/services/Endpoints/agents/title.js
+++ b/api/server/services/Endpoints/agents/title.js
@@ -71,7 +71,7 @@ const addTitle = async (req, { text, response, client }) => {
         conversationId: response.conversationId,
         title,
       },
-      { context: 'api/server/services/Endpoints/agents/title.js' },
+      { context: 'api/server/services/Endpoints/agents/title.js', noUpsert: true },
     );
   } catch (error) {
     logger.error('Error generating title:', error);
diff --git a/api/server/services/Endpoints/assistants/title.js b/api/server/services/Endpoints/assistants/title.js
index a34de4d1af..1fae68cf54 100644
--- a/api/server/services/Endpoints/assistants/title.js
+++ b/api/server/services/Endpoints/assistants/title.js
@@ -69,7 +69,7 @@ const addTitle = async (req, { text, responseText, conversationId }) => {
         conversationId,
         title,
       },
-      { context: 'api/server/services/Endpoints/assistants/addTitle.js' },
+      { context: 'api/server/services/Endpoints/assistants/addTitle.js', noUpsert: true },
     );
   } catch (error) {
     logger.error('[addTitle] Error generating title:', error);
@@ -81,7 +81,7 @@ const addTitle = async (req, { text, responseText, conversationId }) => {
         conversationId,
         title: fallbackTitle,
       },
-      { context: 'api/server/services/Endpoints/assistants/addTitle.js' },
+      { context: 'api/server/services/Endpoints/assistants/addTitle.js', noUpsert: true },
     );
   }
 };
diff --git a/api/server/services/Endpoints/azureAssistants/initialize.js b/api/server/services/Endpoints/azureAssistants/initialize.js
index 6a9118ea8a..e81f0bcd8a 100644
--- a/api/server/services/Endpoints/azureAssistants/initialize.js
+++ b/api/server/services/Endpoints/azureAssistants/initialize.js
@@ -128,7 +128,6 @@ const initializeClient = async ({ req, res, version, endpointOption, initAppClie
       const groupName = modelGroupMap[modelName].group;
       clientOptions.addParams = azureConfig.groupMap[groupName].addParams;
       clientOptions.dropParams = azureConfig.groupMap[groupName].dropParams;
-      clientOptions.forcePrompt = azureConfig.groupMap[groupName].forcePrompt;
 
       clientOptions.reverseProxyUrl = baseURL ?? clientOptions.reverseProxyUrl;
       clientOptions.headers = opts.defaultHeaders;
diff --git a/api/server/services/Endpoints/index.js b/api/server/services/Endpoints/index.js
index 034162702d..3cabfe1c58 100644
--- a/api/server/services/Endpoints/index.js
+++ b/api/server/services/Endpoints/index.js
@@ -12,7 +12,7 @@ const initGoogle = require('~/server/services/Endpoints/google/initialize');
  * @returns {boolean} - True if the provider is a known custom provider, false otherwise
  */
 function isKnownCustomProvider(provider) {
-  return [Providers.XAI, Providers.DEEPSEEK, Providers.OPENROUTER].includes(
+  return [Providers.XAI, Providers.DEEPSEEK, Providers.OPENROUTER, Providers.MOONSHOT].includes(
     provider?.toLowerCase() || '',
   );
 }
@@ -20,6 +20,7 @@ function isKnownCustomProvider(provider) {
 const providerConfigMap = {
   [Providers.XAI]: initCustom,
   [Providers.DEEPSEEK]: initCustom,
+  [Providers.MOONSHOT]: initCustom,
   [Providers.OPENROUTER]: initCustom,
   [EModelEndpoint.openAI]: initOpenAI,
   [EModelEndpoint.google]: initGoogle,
diff --git a/api/server/services/Files/Azure/crud.js b/api/server/services/Files/Azure/crud.js
index 25bd749276..8f681bd06c 100644
--- a/api/server/services/Files/Azure/crud.js
+++ b/api/server/services/Files/Azure/crud.js
@@ -4,7 +4,7 @@ const mime = require('mime');
 const axios = require('axios');
 const fetch = require('node-fetch');
 const { logger } = require('@librechat/data-schemas');
-const { getAzureContainerClient } = require('@librechat/api');
+const { getAzureContainerClient, deleteRagFile } = require('@librechat/api');
 
 const defaultBasePath = 'images';
 const { AZURE_STORAGE_PUBLIC_ACCESS = 'true', AZURE_CONTAINER_NAME = 'files' } = process.env;
@@ -102,6 +102,8 @@ async function getAzureURL({ fileName, basePath = defaultBasePath, userId, conta
  * @param {MongoFile} params.file - The file object.
  */
 async function deleteFileFromAzure(req, file) {
+  await deleteRagFile({ userId: req.user.id, file });
+
   try {
     const containerClient = await getAzureContainerClient(AZURE_CONTAINER_NAME);
     const blobPath = file.filepath.split(`${AZURE_CONTAINER_NAME}/`)[1];
diff --git a/api/server/services/Files/Code/process.js b/api/server/services/Files/Code/process.js
index 15df6de0d6..3f0bfcfc87 100644
--- a/api/server/services/Files/Code/process.js
+++ b/api/server/services/Files/Code/process.js
@@ -6,27 +6,68 @@ const { getCodeBaseURL } = require('@librechat/agents');
 const { logAxiosError, getBasePath } = require('@librechat/api');
 const {
   Tools,
+  megabyte,
+  fileConfig,
   FileContext,
   FileSources,
   imageExtRegex,
+  inferMimeType,
   EToolResources,
+  EModelEndpoint,
+  mergeFileConfig,
+  getEndpointFileConfig,
 } = require('librechat-data-provider');
 const { filterFilesByAgentAccess } = require('~/server/services/Files/permissions');
+const { createFile, getFiles, updateFile, claimCodeFile } = require('~/models');
 const { getStrategyFunctions } = require('~/server/services/Files/strategies');
 const { convertImage } = require('~/server/services/Files/images/convert');
-const { createFile, getFiles, updateFile } = require('~/models');
+const { determineFileType } = require('~/server/utils');
 
 /**
- * Process OpenAI image files, convert to target format, save and return file metadata.
+ * Creates a fallback download URL response when file cannot be processed locally.
+ * Used when: file exceeds size limit, storage strategy unavailable, or download error occurs.
+ * @param {Object} params - The parameters.
+ * @param {string} params.name - The filename.
+ * @param {string} params.session_id - The code execution session ID.
+ * @param {string} params.id - The file ID from the code environment.
+ * @param {string} params.conversationId - The current conversation ID.
+ * @param {string} params.toolCallId - The tool call ID that generated the file.
+ * @param {string} params.messageId - The current message ID.
+ * @param {number} params.expiresAt - Expiration timestamp (24 hours from creation).
+ * @returns {Object} Fallback response with download URL.
+ */
+const createDownloadFallback = ({
+  id,
+  name,
+  messageId,
+  expiresAt,
+  session_id,
+  toolCallId,
+  conversationId,
+}) => {
+  const basePath = getBasePath();
+  return {
+    filename: name,
+    filepath: `${basePath}/api/files/code/download/${session_id}/${id}`,
+    expiresAt,
+    conversationId,
+    toolCallId,
+    messageId,
+  };
+};
+
+/**
+ * Process code execution output files - downloads and saves both images and non-image files.
+ * All files are saved to local storage with fileIdentifier metadata for code env re-upload.
  * @param {ServerRequest} params.req - The Express request object.
- * @param {string} params.id - The file ID.
+ * @param {string} params.id - The file ID from the code environment.
  * @param {string} params.name - The filename.
  * @param {string} params.apiKey - The code execution API key.
  * @param {string} params.toolCallId - The tool call ID that generated the file.
  * @param {string} params.session_id - The code execution session ID.
  * @param {string} params.conversationId - The current conversation ID.
  * @param {string} params.messageId - The current message ID.
- * @returns {Promise<MongoFile & { messageId: string, toolCallId: string } | { filename: string; filepath: string; expiresAt: number; conversationId: string; toolCallId: string; messageId: string } | undefined>} The file metadata or undefined if an error occurs.
+ * @returns {Promise<MongoFile & { messageId: string, toolCallId: string } | undefined>} The file metadata or undefined if an error occurs.
  */
 const processCodeOutput = async ({
   req,
@@ -41,19 +82,15 @@ const processCodeOutput = async ({
   const appConfig = req.config;
   const currentDate = new Date();
   const baseURL = getCodeBaseURL();
-  const basePath = getBasePath();
-  const fileExt = path.extname(name);
-  if (!fileExt || !imageExtRegex.test(name)) {
-    return {
-      filename: name,
-      filepath: `${basePath}/api/files/code/download/${session_id}/${id}`,
-      /** Note: expires 24 hours after creation */
-      expiresAt: currentDate.getTime() + 86400000,
-      conversationId,
-      toolCallId,
-      messageId,
-    };
-  }
+  const fileExt = path.extname(name).toLowerCase();
+  const isImage = fileExt && imageExtRegex.test(name);
+
+  const mergedFileConfig = mergeFileConfig(appConfig.fileConfig);
+  const endpointFileConfig = getEndpointFileConfig({
+    fileConfig: mergedFileConfig,
+    endpoint: EModelEndpoint.agents,
+  });
+  const fileSizeLimit = endpointFileConfig.fileSizeLimit ?? mergedFileConfig.serverFileSizeLimit;
 
   try {
     const formattedDate = currentDate.toISOString();
@@ -70,29 +107,143 @@ const processCodeOutput = async ({
 
     const buffer = Buffer.from(response.data, 'binary');
 
-    const file_id = v4();
-    const _file = await convertImage(req, buffer, 'high', `${file_id}${fileExt}`);
-    const file = {
-      ..._file,
-      file_id,
-      usage: 1,
+    // Enforce file size limit
+    if (buffer.length > fileSizeLimit) {
+      logger.warn(
+        `[processCodeOutput] File "${name}" (${(buffer.length / megabyte).toFixed(2)} MB) exceeds size limit of ${(fileSizeLimit / megabyte).toFixed(2)} MB, falling back to download URL`,
+      );
+      return createDownloadFallback({
+        id,
+        name,
+        messageId,
+        toolCallId,
+        session_id,
+        conversationId,
+        expiresAt: currentDate.getTime() + 86400000,
+      });
+    }
+
+    const fileIdentifier = `${session_id}/${id}`;
+
+    /**
+     * Atomically claim a file_id for this (filename, conversationId, context) tuple.
+     * Uses $setOnInsert so concurrent calls for the same filename converge on
+     * a single record instead of creating duplicates (TOCTOU race fix).
+     */
+    const newFileId = v4();
+    const claimed = await claimCodeFile({
       filename: name,
       conversationId,
+      file_id: newFileId,
       user: req.user.id,
-      type: `image/${appConfig.imageOutputType}`,
-      createdAt: formattedDate,
+    });
+    const file_id = claimed.file_id;
+    const isUpdate = file_id !== newFileId;
+
+    if (isUpdate) {
+      logger.debug(
+        `[processCodeOutput] Updating existing file "${name}" (${file_id}) instead of creating duplicate`,
+      );
+    }
+
+    if (isImage) {
+      const usage = isUpdate ? (claimed.usage ?? 0) + 1 : 1;
+      const _file = await convertImage(req, buffer, 'high', `${file_id}${fileExt}`);
+      const filepath = usage > 1 ? `${_file.filepath}?v=${Date.now()}` : _file.filepath;
+      const file = {
+        ..._file,
+        filepath,
+        file_id,
+        messageId,
+        usage,
+        filename: name,
+        conversationId,
+        user: req.user.id,
+        type: `image/${appConfig.imageOutputType}`,
+        createdAt: isUpdate ? claimed.createdAt : formattedDate,
+        updatedAt: formattedDate,
+        source: appConfig.fileStrategy,
+        context: FileContext.execute_code,
+        metadata: { fileIdentifier },
+      };
+      await createFile(file, true);
+      return Object.assign(file, { messageId, toolCallId });
+    }
+
+    const { saveBuffer } = getStrategyFunctions(appConfig.fileStrategy);
+    if (!saveBuffer) {
+      logger.warn(
+        `[processCodeOutput] saveBuffer not available for strategy ${appConfig.fileStrategy}, falling back to download URL`,
+      );
+      return createDownloadFallback({
+        id,
+        name,
+        messageId,
+        toolCallId,
+        session_id,
+        conversationId,
+        expiresAt: currentDate.getTime() + 86400000,
+      });
+    }
+
+    const detectedType = await determineFileType(buffer, true);
+    const mimeType = detectedType?.mime || inferMimeType(name, '') || 'application/octet-stream';
+
+    /** Check MIME type support - for code-generated files, we're lenient but log unsupported types */
+    const isSupportedMimeType = fileConfig.checkType(
+      mimeType,
+      endpointFileConfig.supportedMimeTypes,
+    );
+    if (!isSupportedMimeType) {
+      logger.warn(
+        `[processCodeOutput] File "${name}" has unsupported MIME type "${mimeType}", proceeding with storage but may not be usable as tool resource`,
+      );
+    }
+
+    const fileName = `${file_id}__${name}`;
+    const filepath = await saveBuffer({
+      userId: req.user.id,
+      buffer,
+      fileName,
+      basePath: 'uploads',
+    });
+
+    const file = {
+      file_id,
+      filepath,
+      messageId,
+      object: 'file',
+      filename: name,
+      type: mimeType,
+      conversationId,
+      user: req.user.id,
+      bytes: buffer.length,
       updatedAt: formattedDate,
+      metadata: { fileIdentifier },
       source: appConfig.fileStrategy,
       context: FileContext.execute_code,
+      usage: isUpdate ? (claimed.usage ?? 0) + 1 : 1,
+      createdAt: isUpdate ? claimed.createdAt : formattedDate,
     };
-    createFile(file, true);
-    /** Note: `messageId` & `toolCallId` are not part of file DB schema; message object records associated file ID */
+
+    await createFile(file, true);
     return Object.assign(file, { messageId, toolCallId });
   } catch (error) {
     logAxiosError({
-      message: 'Error downloading code environment file',
+      message: 'Error downloading/processing code environment file',
       error,
     });
+
+    // Fallback for download errors - return download URL so user can still manually download
+    return createDownloadFallback({
+      id,
+      name,
+      messageId,
+      toolCallId,
+      session_id,
+      conversationId,
+      expiresAt: currentDate.getTime() + 86400000,
+    });
   }
 };
 
@@ -204,9 +355,16 @@ const primeFiles = async (options, apiKey) => {
         if (!toolContext) {
           toolContext = `- Note: The following files are available in the "${Tools.execute_code}" tool environment:`;
         }
-        toolContext += `\n\t- /mnt/data/${file.filename}${
-          agentResourceIds.has(file.file_id) ? '' : ' (just attached by user)'
-        }`;
+
+        let fileSuffix = '';
+        if (!agentResourceIds.has(file.file_id)) {
+          fileSuffix =
+            file.context === FileContext.execute_code
+              ? ' (from previous code execution)'
+              : ' (attached by user)';
+        }
+
+        toolContext += `\n\t- /mnt/data/${file.filename}${fileSuffix}`;
         files.push({
           id,
           session_id,
diff --git a/api/server/services/Files/Code/process.spec.js b/api/server/services/Files/Code/process.spec.js
new file mode 100644
index 0000000000..f01a623f90
--- /dev/null
+++ b/api/server/services/Files/Code/process.spec.js
@@ -0,0 +1,411 @@
+// Configurable file size limit for tests - use a getter so it can be changed per test
+const fileSizeLimitConfig = { value: 20 * 1024 * 1024 }; // Default 20MB
+
+// Mock librechat-data-provider with configurable file size limit
+jest.mock('librechat-data-provider', () => {
+  const actual = jest.requireActual('librechat-data-provider');
+  return {
+    ...actual,
+    mergeFileConfig: jest.fn((config) => {
+      const merged = actual.mergeFileConfig(config);
+      // Override the serverFileSizeLimit with our test value
+      return {
+        ...merged,
+        get serverFileSizeLimit() {
+          return fileSizeLimitConfig.value;
+        },
+      };
+    }),
+    getEndpointFileConfig: jest.fn((options) => {
+      const config = actual.getEndpointFileConfig(options);
+      // Override fileSizeLimit with our test value
+      return {
+        ...config,
+        get fileSizeLimit() {
+          return fileSizeLimitConfig.value;
+        },
+      };
+    }),
+  };
+});
+
+const { FileContext } = require('librechat-data-provider');
+
+// Mock uuid
+jest.mock('uuid', () => ({
+  v4: jest.fn(() => 'mock-uuid-1234'),
+}));
+
+// Mock axios
+jest.mock('axios');
+const axios = require('axios');
+
+// Mock logger
+jest.mock('@librechat/data-schemas', () => ({
+  logger: {
+    warn: jest.fn(),
+    debug: jest.fn(),
+    error: jest.fn(),
+  },
+}));
+
+// Mock getCodeBaseURL
+jest.mock('@librechat/agents', () => ({
+  getCodeBaseURL: jest.fn(() => 'https://code-api.example.com'),
+}));
+
+// Mock logAxiosError and getBasePath
+jest.mock('@librechat/api', () => ({
+  logAxiosError: jest.fn(),
+  getBasePath: jest.fn(() => ''),
+}));
+
+// Mock models
+const mockClaimCodeFile = jest.fn();
+jest.mock('~/models', () => ({
+  createFile: jest.fn().mockResolvedValue({}),
+  getFiles: jest.fn(),
+  updateFile: jest.fn(),
+  claimCodeFile: (...args) => mockClaimCodeFile(...args),
+}));
+
+// Mock permissions (must be before process.js import)
+jest.mock('~/server/services/Files/permissions', () => ({
+  filterFilesByAgentAccess: jest.fn((options) => Promise.resolve(options.files)),
+}));
+
+// Mock strategy functions
+jest.mock('~/server/services/Files/strategies', () => ({
+  getStrategyFunctions: jest.fn(),
+}));
+
+// Mock convertImage
+jest.mock('~/server/services/Files/images/convert', () => ({
+  convertImage: jest.fn(),
+}));
+
+// Mock determineFileType
+jest.mock('~/server/utils', () => ({
+  determineFileType: jest.fn(),
+}));
+
+const { createFile, getFiles } = require('~/models');
+const { getStrategyFunctions } = require('~/server/services/Files/strategies');
+const { convertImage } = require('~/server/services/Files/images/convert');
+const { determineFileType } = require('~/server/utils');
+const { logger } = require('@librechat/data-schemas');
+
+// Import after mocks
+const { processCodeOutput } = require('./process');
+
+describe('Code Process', () => {
+  const mockReq = {
+    user: { id: 'user-123' },
+    config: {
+      fileConfig: {},
+      fileStrategy: 'local',
+      imageOutputType: 'webp',
+    },
+  };
+
+  const baseParams = {
+    req: mockReq,
+    id: 'file-id-123',
+    name: 'test-file.txt',
+    apiKey: 'test-api-key',
+    toolCallId: 'tool-call-123',
+    conversationId: 'conv-123',
+    messageId: 'msg-123',
+    session_id: 'session-123',
+  };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    // Default mock: atomic claim returns a new file record (no existing file)
+    mockClaimCodeFile.mockResolvedValue({
+      file_id: 'mock-uuid-1234',
+      user: 'user-123',
+    });
+    getFiles.mockResolvedValue(null);
+    createFile.mockResolvedValue({});
+    getStrategyFunctions.mockReturnValue({
+      saveBuffer: jest.fn().mockResolvedValue('/uploads/mock-file-path.txt'),
+    });
+    determineFileType.mockResolvedValue({ mime: 'text/plain' });
+  });
+
+  describe('atomic file claim (via processCodeOutput)', () => {
+    it('should reuse file_id from existing record via atomic claim', async () => {
+      mockClaimCodeFile.mockResolvedValue({
+        file_id: 'existing-file-id',
+        filename: 'test-file.txt',
+        usage: 2,
+        createdAt: '2024-01-01T00:00:00.000Z',
+      });
+
+      const smallBuffer = Buffer.alloc(100);
+      axios.mockResolvedValue({ data: smallBuffer });
+
+      const result = await processCodeOutput(baseParams);
+
+      expect(mockClaimCodeFile).toHaveBeenCalledWith({
+        filename: 'test-file.txt',
+        conversationId: 'conv-123',
+        file_id: 'mock-uuid-1234',
+        user: 'user-123',
+      });
+
+      expect(result.file_id).toBe('existing-file-id');
+      expect(result.usage).toBe(3);
+      expect(result.createdAt).toBe('2024-01-01T00:00:00.000Z');
+    });
+
+    it('should create new file when no existing file found', async () => {
+      mockClaimCodeFile.mockResolvedValue({
+        file_id: 'mock-uuid-1234',
+        user: 'user-123',
+      });
+
+      const smallBuffer = Buffer.alloc(100);
+      axios.mockResolvedValue({ data: smallBuffer });
+
+      const result = await processCodeOutput(baseParams);
+
+      expect(result.file_id).toBe('mock-uuid-1234');
+      expect(result.usage).toBe(1);
+    });
+  });
+
+  describe('processCodeOutput', () => {
+    describe('image file processing', () => {
+      it('should process image files using convertImage', async () => {
+        const imageParams = { ...baseParams, name: 'chart.png' };
+        const imageBuffer = Buffer.alloc(500);
+        axios.mockResolvedValue({ data: imageBuffer });
+
+        const convertedFile = {
+          filepath: '/uploads/converted-image.webp',
+          bytes: 400,
+        };
+        convertImage.mockResolvedValue(convertedFile);
+
+        const result = await processCodeOutput(imageParams);
+
+        expect(convertImage).toHaveBeenCalledWith(
+          mockReq,
+          imageBuffer,
+          'high',
+          'mock-uuid-1234.png',
+        );
+        expect(result.type).toBe('image/webp');
+        expect(result.context).toBe(FileContext.execute_code);
+        expect(result.filename).toBe('chart.png');
+      });
+
+      it('should update existing image file with cache-busted filepath', async () => {
+        const imageParams = { ...baseParams, name: 'chart.png' };
+        mockClaimCodeFile.mockResolvedValue({
+          file_id: 'existing-img-id',
+          usage: 1,
+          createdAt: '2024-01-01T00:00:00.000Z',
+        });
+
+        const imageBuffer = Buffer.alloc(500);
+        axios.mockResolvedValue({ data: imageBuffer });
+        convertImage.mockResolvedValue({ filepath: '/images/user-123/existing-img-id.webp' });
+
+        const result = await processCodeOutput(imageParams);
+
+        expect(convertImage).toHaveBeenCalledWith(
+          mockReq,
+          imageBuffer,
+          'high',
+          'existing-img-id.png',
+        );
+        expect(result.file_id).toBe('existing-img-id');
+        expect(result.usage).toBe(2);
+        expect(result.filepath).toMatch(/^\/images\/user-123\/existing-img-id\.webp\?v=\d+$/);
+        expect(logger.debug).toHaveBeenCalledWith(
+          expect.stringContaining('Updating existing file'),
+        );
+      });
+    });
+
+    describe('non-image file processing', () => {
+      it('should process non-image files using saveBuffer', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        const mockSaveBuffer = jest.fn().mockResolvedValue('/uploads/saved-file.txt');
+        getStrategyFunctions.mockReturnValue({ saveBuffer: mockSaveBuffer });
+        determineFileType.mockResolvedValue({ mime: 'text/plain' });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(mockSaveBuffer).toHaveBeenCalledWith({
+          userId: 'user-123',
+          buffer: smallBuffer,
+          fileName: 'mock-uuid-1234__test-file.txt',
+          basePath: 'uploads',
+        });
+        expect(result.type).toBe('text/plain');
+        expect(result.filepath).toBe('/uploads/saved-file.txt');
+        expect(result.bytes).toBe(100);
+      });
+
+      it('should detect MIME type from buffer', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+        determineFileType.mockResolvedValue({ mime: 'application/pdf' });
+
+        const result = await processCodeOutput({ ...baseParams, name: 'document.pdf' });
+
+        expect(determineFileType).toHaveBeenCalledWith(smallBuffer, true);
+        expect(result.type).toBe('application/pdf');
+      });
+
+      it('should fallback to application/octet-stream for unknown types', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+        determineFileType.mockResolvedValue(null);
+
+        const result = await processCodeOutput({ ...baseParams, name: 'unknown.xyz' });
+
+        expect(result.type).toBe('application/octet-stream');
+      });
+    });
+
+    describe('file size limit enforcement', () => {
+      it('should fallback to download URL when file exceeds size limit', async () => {
+        // Set a small file size limit for this test
+        fileSizeLimitConfig.value = 1000; // 1KB limit
+
+        const largeBuffer = Buffer.alloc(5000); // 5KB - exceeds 1KB limit
+        axios.mockResolvedValue({ data: largeBuffer });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(logger.warn).toHaveBeenCalledWith(expect.stringContaining('exceeds size limit'));
+        expect(result.filepath).toContain('/api/files/code/download/session-123/file-id-123');
+        expect(result.expiresAt).toBeDefined();
+        // Should not call createFile for oversized files (fallback path)
+        expect(createFile).not.toHaveBeenCalled();
+
+        // Reset to default for other tests
+        fileSizeLimitConfig.value = 20 * 1024 * 1024;
+      });
+    });
+
+    describe('fallback behavior', () => {
+      it('should fallback to download URL when saveBuffer is not available', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+        getStrategyFunctions.mockReturnValue({ saveBuffer: null });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(logger.warn).toHaveBeenCalledWith(
+          expect.stringContaining('saveBuffer not available'),
+        );
+        expect(result.filepath).toContain('/api/files/code/download/');
+        expect(result.filename).toBe('test-file.txt');
+      });
+
+      it('should fallback to download URL on axios error', async () => {
+        axios.mockRejectedValue(new Error('Network error'));
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(result.filepath).toContain('/api/files/code/download/session-123/file-id-123');
+        expect(result.conversationId).toBe('conv-123');
+        expect(result.messageId).toBe('msg-123');
+        expect(result.toolCallId).toBe('tool-call-123');
+      });
+    });
+
+    describe('usage counter increment', () => {
+      it('should set usage to 1 for new files', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(result.usage).toBe(1);
+      });
+
+      it('should increment usage for existing files', async () => {
+        mockClaimCodeFile.mockResolvedValue({
+          file_id: 'existing-id',
+          usage: 5,
+          createdAt: '2024-01-01',
+        });
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(result.usage).toBe(6);
+      });
+
+      it('should handle existing file with undefined usage', async () => {
+        mockClaimCodeFile.mockResolvedValue({
+          file_id: 'existing-id',
+          createdAt: '2024-01-01',
+        });
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(result.usage).toBe(1);
+      });
+    });
+
+    describe('metadata and file properties', () => {
+      it('should include fileIdentifier in metadata', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(result.metadata).toEqual({
+          fileIdentifier: 'session-123/file-id-123',
+        });
+      });
+
+      it('should set correct context for code-generated files', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(result.context).toBe(FileContext.execute_code);
+      });
+
+      it('should include toolCallId and messageId in result', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        const result = await processCodeOutput(baseParams);
+
+        expect(result.toolCallId).toBe('tool-call-123');
+        expect(result.messageId).toBe('msg-123');
+      });
+
+      it('should call createFile with upsert enabled', async () => {
+        const smallBuffer = Buffer.alloc(100);
+        axios.mockResolvedValue({ data: smallBuffer });
+
+        await processCodeOutput(baseParams);
+
+        expect(createFile).toHaveBeenCalledWith(
+          expect.objectContaining({
+            file_id: 'mock-uuid-1234',
+            context: FileContext.execute_code,
+          }),
+          true, // upsert flag
+        );
+      });
+    });
+  });
+});
diff --git a/api/server/services/Files/Firebase/crud.js b/api/server/services/Files/Firebase/crud.js
index 170df45677..d5e5a409bf 100644
--- a/api/server/services/Files/Firebase/crud.js
+++ b/api/server/services/Files/Firebase/crud.js
@@ -3,7 +3,7 @@ const path = require('path');
 const axios = require('axios');
 const fetch = require('node-fetch');
 const { logger } = require('@librechat/data-schemas');
-const { getFirebaseStorage } = require('@librechat/api');
+const { getFirebaseStorage, deleteRagFile } = require('@librechat/api');
 const { ref, uploadBytes, getDownloadURL, deleteObject } = require('firebase/storage');
 const { getBufferMetadata } = require('~/server/utils');
 
@@ -167,27 +167,7 @@ function extractFirebaseFilePath(urlString) {
  *          Throws an error if there is an issue with deletion.
  */
 const deleteFirebaseFile = async (req, file) => {
-  if (file.embedded && process.env.RAG_API_URL) {
-    const jwtToken = req.headers.authorization.split(' ')[1];
-    try {
-      await axios.delete(`${process.env.RAG_API_URL}/documents`, {
-        headers: {
-          Authorization: `Bearer ${jwtToken}`,
-          'Content-Type': 'application/json',
-          accept: 'application/json',
-        },
-        data: [file.file_id],
-      });
-    } catch (error) {
-      if (error.response?.status === 404) {
-        logger.warn(
-          `[deleteFirebaseFile] Document ${file.file_id} not found in RAG API, may have been deleted already`,
-        );
-      } else {
-        logger.error('[deleteFirebaseFile] Error deleting document from RAG API:', error);
-      }
-    }
-  }
+  await deleteRagFile({ userId: req.user.id, file });
 
   const fileName = extractFirebaseFilePath(file.filepath);
   if (!fileName.includes(req.user.id)) {
diff --git a/api/server/services/Files/Local/crud.js b/api/server/services/Files/Local/crud.js
index db553f57dd..1f38a01f83 100644
--- a/api/server/services/Files/Local/crud.js
+++ b/api/server/services/Files/Local/crud.js
@@ -1,9 +1,9 @@
 const fs = require('fs');
 const path = require('path');
 const axios = require('axios');
+const { deleteRagFile } = require('@librechat/api');
 const { logger } = require('@librechat/data-schemas');
 const { EModelEndpoint } = require('librechat-data-provider');
-const { generateShortLivedToken } = require('@librechat/api');
 const { resizeImageBuffer } = require('~/server/services/Files/images/resize');
 const { getBufferMetadata } = require('~/server/utils');
 const paths = require('~/config/paths');
@@ -67,7 +67,12 @@ async function saveLocalBuffer({ userId, buffer, fileName, basePath = 'images' }
   try {
     const { publicPath, uploads } = paths;
 
-    const directoryPath = path.join(basePath === 'images' ? publicPath : uploads, basePath, userId);
+    /**
+     * For 'images': save to publicPath/images/userId (images are served statically)
+     * For 'uploads': save to uploads/userId (files downloaded via API)
+     * */
+    const directoryPath =
+      basePath === 'images' ? path.join(publicPath, basePath, userId) : path.join(uploads, userId);
 
     if (!fs.existsSync(directoryPath)) {
       fs.mkdirSync(directoryPath, { recursive: true });
@@ -208,27 +213,7 @@ const deleteLocalFile = async (req, file) => {
   /** Filepath stripped of query parameters (e.g., ?manual=true) */
   const cleanFilepath = file.filepath.split('?')[0];
 
-  if (file.embedded && process.env.RAG_API_URL) {
-    const jwtToken = generateShortLivedToken(req.user.id);
-    try {
-      await axios.delete(`${process.env.RAG_API_URL}/documents`, {
-        headers: {
-          Authorization: `Bearer ${jwtToken}`,
-          'Content-Type': 'application/json',
-          accept: 'application/json',
-        },
-        data: [file.file_id],
-      });
-    } catch (error) {
-      if (error.response?.status === 404) {
-        logger.warn(
-          `[deleteLocalFile] Document ${file.file_id} not found in RAG API, may have been deleted already`,
-        );
-      } else {
-        logger.error('[deleteLocalFile] Error deleting document from RAG API:', error);
-      }
-    }
-  }
+  await deleteRagFile({ userId: req.user.id, file });
 
   if (cleanFilepath.startsWith(`/uploads/${req.user.id}`)) {
     const userUploadDir = path.join(uploads, req.user.id);
diff --git a/api/server/services/Files/S3/crud.js b/api/server/services/Files/S3/crud.js
index 8dac767aa2..0721e33b29 100644
--- a/api/server/services/Files/S3/crud.js
+++ b/api/server/services/Files/S3/crud.js
@@ -1,9 +1,9 @@
 const fs = require('fs');
 const fetch = require('node-fetch');
-const { initializeS3 } = require('@librechat/api');
 const { logger } = require('@librechat/data-schemas');
 const { FileSources } = require('librechat-data-provider');
 const { getSignedUrl } = require('@aws-sdk/s3-request-presigner');
+const { initializeS3, deleteRagFile } = require('@librechat/api');
 const {
   PutObjectCommand,
   GetObjectCommand,
@@ -142,6 +142,8 @@ async function saveURLToS3({ userId, URL, fileName, basePath = defaultBasePath }
  * @returns {Promise<void>}
  */
 async function deleteFileFromS3(req, file) {
+  await deleteRagFile({ userId: req.user.id, file });
+
   const key = extractKeyFromS3Url(file.filepath);
   const params = { Bucket: bucketName, Key: key };
   if (!key.includes(req.user.id)) {
diff --git a/api/server/services/MCP.js b/api/server/services/MCP.js
index 81d7107de4..ad1f9f5cc3 100644
--- a/api/server/services/MCP.js
+++ b/api/server/services/MCP.js
@@ -1,4 +1,3 @@
-const { z } = require('zod');
 const { tool } = require('@langchain/core/tools');
 const { logger } = require('@librechat/data-schemas');
 const {
@@ -12,8 +11,9 @@ const {
   MCPOAuthHandler,
   isMCPDomainAllowed,
   normalizeServerName,
-  convertWithResolvedRefs,
+  normalizeJsonSchema,
   GenerationJobManager,
+  resolveJsonSchemaRefs,
 } = require('@librechat/api');
 const {
   Time,
@@ -29,10 +29,21 @@ const {
   getMCPManager,
 } = require('~/config');
 const { findToken, createToken, updateToken } = require('~/models');
+const { getGraphApiToken } = require('./GraphTokenService');
 const { reinitMCPServer } = require('./Tools/mcp');
 const { getAppConfig } = require('./Config');
 const { getLogStores } = require('~/cache');
 
+function isEmptyObjectSchema(jsonSchema) {
+  return (
+    jsonSchema != null &&
+    typeof jsonSchema === 'object' &&
+    jsonSchema.type === 'object' &&
+    (jsonSchema.properties == null || Object.keys(jsonSchema.properties).length === 0) &&
+    !jsonSchema.additionalProperties
+  );
+}
+
 /**
  * @param {object} params
  * @param {ServerResponse} params.res - The Express response object for sending events.
@@ -43,9 +54,9 @@ const { getLogStores } = require('~/cache');
 function createRunStepDeltaEmitter({ res, stepId, toolCall, streamId = null }) {
   /**
    * @param {string} authURL - The URL to redirect the user for OAuth authentication.
-   * @returns {void}
+   * @returns {Promise<void>}
    */
-  return function (authURL) {
+  return async function (authURL) {
     /** @type {{ id: string; delta: AgentToolCallDelta }} */
     const data = {
       id: stepId,
@@ -58,7 +69,7 @@ function createRunStepDeltaEmitter({ res, stepId, toolCall, streamId = null }) {
     };
     const eventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
     if (streamId) {
-      GenerationJobManager.emitChunk(streamId, eventData);
+      await GenerationJobManager.emitChunk(streamId, eventData);
     } else {
       sendEvent(res, eventData);
     }
@@ -73,9 +84,10 @@ function createRunStepDeltaEmitter({ res, stepId, toolCall, streamId = null }) {
  * @param {ToolCallChunk} params.toolCall - The tool call object containing tool information.
  * @param {number} [params.index]
  * @param {string | null} [params.streamId] - The stream ID for resumable mode.
+ * @returns {() => Promise<void>}
  */
 function createRunStepEmitter({ res, runId, stepId, toolCall, index, streamId = null }) {
-  return function () {
+  return async function () {
     /** @type {import('@librechat/agents').RunStep} */
     const data = {
       runId: runId ?? Constants.USE_PRELIM_RESPONSE_MESSAGE_ID,
@@ -89,7 +101,7 @@ function createRunStepEmitter({ res, runId, stepId, toolCall, index, streamId =
     };
     const eventData = { event: GraphEvents.ON_RUN_STEP, data };
     if (streamId) {
-      GenerationJobManager.emitChunk(streamId, eventData);
+      await GenerationJobManager.emitChunk(streamId, eventData);
     } else {
       sendEvent(res, eventData);
     }
@@ -137,7 +149,7 @@ function createOAuthEnd({ res, stepId, toolCall, streamId = null }) {
     };
     const eventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
     if (streamId) {
-      GenerationJobManager.emitChunk(streamId, eventData);
+      await GenerationJobManager.emitChunk(streamId, eventData);
     } else {
       sendEvent(res, eventData);
     }
@@ -196,6 +208,9 @@ async function reconnectServer({
   userMCPAuthMap,
   streamId = null,
 }) {
+  logger.debug(
+    `[MCP][reconnectServer] serverName: ${serverName}, user: ${user?.id}, hasUserMCPAuthMap: ${!!userMCPAuthMap}`,
+  );
   const runId = Constants.USE_PRELIM_RESPONSE_MESSAGE_ID;
   const flowId = `${user.id}:${serverName}:${Date.now()}`;
   const flowManager = getFlowStateManager(getLogStores(CacheKeys.FLOWS));
@@ -428,13 +443,17 @@ function createToolInstance({
   /** @type {LCTool} */
   const { description, parameters } = toolDefinition;
   const isGoogle = _provider === Providers.VERTEXAI || _provider === Providers.GOOGLE;
-  let schema = convertWithResolvedRefs(parameters, {
-    allowEmptyObject: !isGoogle,
-    transformOneOfAnyOf: true,
-  });
 
-  if (!schema) {
-    schema = z.object({ input: z.string().optional() });
+  let schema = parameters ? normalizeJsonSchema(resolveJsonSchemaRefs(parameters)) : null;
+
+  if (!schema || (isGoogle && isEmptyObjectSchema(schema))) {
+    schema = {
+      type: 'object',
+      properties: {
+        input: { type: 'string', description: 'Input for the tool' },
+      },
+      required: [],
+    };
   }
 
   const normalizedToolKey = `${toolName}${Constants.mcp_delimiter}${normalizeServerName(serverName)}`;
@@ -501,6 +520,7 @@ function createToolInstance({
         },
         oauthStart,
         oauthEnd,
+        graphTokenResolver: getGraphApiToken,
       });
 
       if (isAssistantsEndpoint(provider) && Array.isArray(result)) {
@@ -548,6 +568,7 @@ function createToolInstance({
   });
   toolInstance.mcp = true;
   toolInstance.mcpRawServerName = serverName;
+  toolInstance.mcpJsonSchema = parameters;
   return toolInstance;
 }
 
diff --git a/api/server/services/MCP.spec.js b/api/server/services/MCP.spec.js
index cb2f0081a3..b2caebc91e 100644
--- a/api/server/services/MCP.spec.js
+++ b/api/server/services/MCP.spec.js
@@ -9,30 +9,6 @@ jest.mock('@librechat/data-schemas', () => ({
   },
 }));
 
-jest.mock('@langchain/core/tools', () => ({
-  tool: jest.fn((fn, config) => {
-    const toolInstance = { _call: fn, ...config };
-    return toolInstance;
-  }),
-}));
-
-jest.mock('@librechat/agents', () => ({
-  Providers: {
-    VERTEXAI: 'vertexai',
-    GOOGLE: 'google',
-  },
-  StepTypes: {
-    TOOL_CALLS: 'tool_calls',
-  },
-  GraphEvents: {
-    ON_RUN_STEP_DELTA: 'on_run_step_delta',
-    ON_RUN_STEP: 'on_run_step',
-  },
-  Constants: {
-    CONTENT_AND_ARTIFACT: 'content_and_artifact',
-  },
-}));
-
 // Create mock registry instance
 const mockRegistryInstance = {
   getOAuthServers: jest.fn(() => Promise.resolve(new Set())),
@@ -46,26 +22,23 @@ const mockIsMCPDomainAllowed = jest.fn(() => Promise.resolve(true));
 const mockGetAppConfig = jest.fn(() => Promise.resolve({}));
 
 jest.mock('@librechat/api', () => {
-  // Access mock via getter to avoid hoisting issues
+  const actual = jest.requireActual('@librechat/api');
   return {
-    MCPOAuthHandler: {
-      generateFlowId: jest.fn(),
-    },
+    ...actual,
     sendEvent: jest.fn(),
-    normalizeServerName: jest.fn((name) => name),
-    convertWithResolvedRefs: jest.fn((params) => params),
     get isMCPDomainAllowed() {
       return mockIsMCPDomainAllowed;
     },
-    MCPServersRegistry: {
-      getInstance: () => mockRegistryInstance,
+    GenerationJobManager: {
+      emitChunk: jest.fn(),
     },
   };
 });
 
 const { logger } = require('@librechat/data-schemas');
 const { MCPOAuthHandler } = require('@librechat/api');
-const { CacheKeys } = require('librechat-data-provider');
+const { CacheKeys, Constants } = require('librechat-data-provider');
+const D = Constants.mcp_delimiter;
 const {
   createMCPTool,
   createMCPTools,
@@ -74,24 +47,6 @@ const {
   getServerConnectionStatus,
 } = require('./MCP');
 
-jest.mock('librechat-data-provider', () => ({
-  CacheKeys: {
-    FLOWS: 'flows',
-  },
-  Constants: {
-    USE_PRELIM_RESPONSE_MESSAGE_ID: 'prelim_response_id',
-    mcp_delimiter: '::',
-    mcp_prefix: 'mcp_',
-  },
-  ContentTypes: {
-    TEXT: 'text',
-  },
-  isAssistantsEndpoint: jest.fn(() => false),
-  Time: {
-    TWO_MINUTES: 120000,
-  },
-}));
-
 jest.mock('./Config', () => ({
   loadCustomConfig: jest.fn(),
   get getAppConfig() {
@@ -120,6 +75,10 @@ jest.mock('./Tools/mcp', () => ({
   reinitMCPServer: jest.fn(),
 }));
 
+jest.mock('./GraphTokenService', () => ({
+  getGraphApiToken: jest.fn(),
+}));
+
 describe('tests for the new helper functions used by the MCP connection status endpoints', () => {
   let mockGetMCPManager;
   let mockGetFlowStateManager;
@@ -128,6 +87,7 @@ describe('tests for the new helper functions used by the MCP connection status e
 
   beforeEach(() => {
     jest.clearAllMocks();
+    jest.spyOn(MCPOAuthHandler, 'generateFlowId');
 
     mockGetMCPManager = require('~/config').getMCPManager;
     mockGetFlowStateManager = require('~/config').getFlowStateManager;
@@ -731,7 +691,7 @@ describe('User parameter passing tests', () => {
       mockReinitMCPServer.mockResolvedValue({
         tools: [{ name: 'test-tool' }],
         availableTools: {
-          'test-tool::test-server': {
+          [`test-tool${D}test-server`]: {
             function: {
               description: 'Test tool',
               parameters: { type: 'object', properties: {} },
@@ -791,7 +751,7 @@ describe('User parameter passing tests', () => {
 
       mockReinitMCPServer.mockResolvedValue({
         availableTools: {
-          'test-tool::test-server': {
+          [`test-tool${D}test-server`]: {
             function: {
               description: 'Test tool',
               parameters: { type: 'object', properties: {} },
@@ -804,7 +764,7 @@ describe('User parameter passing tests', () => {
       await createMCPTool({
         res: mockRes,
         user: mockUser,
-        toolKey: 'test-tool::test-server',
+        toolKey: `test-tool${D}test-server`,
         provider: 'openai',
         signal: mockSignal,
         userMCPAuthMap: {},
@@ -826,7 +786,7 @@ describe('User parameter passing tests', () => {
       const mockRes = { write: jest.fn(), flush: jest.fn() };
 
       const availableTools = {
-        'test-tool::test-server': {
+        [`test-tool${D}test-server`]: {
           function: {
             description: 'Cached tool',
             parameters: { type: 'object', properties: {} },
@@ -837,7 +797,7 @@ describe('User parameter passing tests', () => {
       await createMCPTool({
         res: mockRes,
         user: mockUser,
-        toolKey: 'test-tool::test-server',
+        toolKey: `test-tool${D}test-server`,
         provider: 'openai',
         userMCPAuthMap: {},
         availableTools: availableTools,
@@ -860,8 +820,8 @@ describe('User parameter passing tests', () => {
         return Promise.resolve({
           tools: [{ name: 'tool1' }, { name: 'tool2' }],
           availableTools: {
-            'tool1::server1': { function: { description: 'Tool 1', parameters: {} } },
-            'tool2::server1': { function: { description: 'Tool 2', parameters: {} } },
+            [`tool1${D}server1`]: { function: { description: 'Tool 1', parameters: {} } },
+            [`tool2${D}server1`]: { function: { description: 'Tool 2', parameters: {} } },
           },
         });
       });
@@ -892,7 +852,7 @@ describe('User parameter passing tests', () => {
         reinitCalls.push(params);
         return Promise.resolve({
           availableTools: {
-            'my-tool::my-server': {
+            [`my-tool${D}my-server`]: {
               function: { description: 'My Tool', parameters: {} },
             },
           },
@@ -902,7 +862,7 @@ describe('User parameter passing tests', () => {
       await createMCPTool({
         res: mockRes,
         user: mockUser,
-        toolKey: 'my-tool::my-server',
+        toolKey: `my-tool${D}my-server`,
         provider: 'google',
         userMCPAuthMap: {},
         availableTools: undefined, // Force reinit
@@ -936,11 +896,11 @@ describe('User parameter passing tests', () => {
       const result = await createMCPTool({
         res: mockRes,
         user: mockUser,
-        toolKey: 'test-tool::test-server',
+        toolKey: `test-tool${D}test-server`,
         provider: 'openai',
         userMCPAuthMap: {},
         availableTools: {
-          'test-tool::test-server': {
+          [`test-tool${D}test-server`]: {
             function: {
               description: 'Test tool',
               parameters: { type: 'object', properties: {} },
@@ -983,7 +943,7 @@ describe('User parameter passing tests', () => {
       mockIsMCPDomainAllowed.mockResolvedValueOnce(true);
 
       const availableTools = {
-        'test-tool::test-server': {
+        [`test-tool${D}test-server`]: {
           function: {
             description: 'Test tool',
             parameters: { type: 'object', properties: {} },
@@ -994,7 +954,7 @@ describe('User parameter passing tests', () => {
       const result = await createMCPTool({
         res: mockRes,
         user: mockUser,
-        toolKey: 'test-tool::test-server',
+        toolKey: `test-tool${D}test-server`,
         provider: 'openai',
         userMCPAuthMap: {},
         availableTools,
@@ -1023,7 +983,7 @@ describe('User parameter passing tests', () => {
       });
 
       const availableTools = {
-        'test-tool::test-server': {
+        [`test-tool${D}test-server`]: {
           function: {
             description: 'Test tool',
             parameters: { type: 'object', properties: {} },
@@ -1034,7 +994,7 @@ describe('User parameter passing tests', () => {
       const result = await createMCPTool({
         res: mockRes,
         user: mockUser,
-        toolKey: 'test-tool::test-server',
+        toolKey: `test-tool${D}test-server`,
         provider: 'openai',
         userMCPAuthMap: {},
         availableTools,
@@ -1100,7 +1060,7 @@ describe('User parameter passing tests', () => {
       mockIsMCPDomainAllowed.mockResolvedValue(true);
 
       const availableTools = {
-        'test-tool::test-server': {
+        [`test-tool${D}test-server`]: {
           function: {
             description: 'Test tool',
             parameters: { type: 'object', properties: {} },
@@ -1112,7 +1072,7 @@ describe('User parameter passing tests', () => {
       await createMCPTool({
         res: mockRes,
         user: adminUser,
-        toolKey: 'test-tool::test-server',
+        toolKey: `test-tool${D}test-server`,
         provider: 'openai',
         userMCPAuthMap: {},
         availableTools,
@@ -1126,7 +1086,7 @@ describe('User parameter passing tests', () => {
       await createMCPTool({
         res: mockRes,
         user: regularUser,
-        toolKey: 'test-tool::test-server',
+        toolKey: `test-tool${D}test-server`,
         provider: 'openai',
         userMCPAuthMap: {},
         availableTools,
@@ -1154,7 +1114,7 @@ describe('User parameter passing tests', () => {
         return Promise.resolve({
           tools: [{ name: 'test' }],
           availableTools: {
-            'test::server': { function: { description: 'Test', parameters: {} } },
+            [`test${D}server`]: { function: { description: 'Test', parameters: {} } },
           },
         });
       });
diff --git a/api/server/services/PermissionService.js b/api/server/services/PermissionService.js
index c35faf7c8d..a843f48f6f 100644
--- a/api/server/services/PermissionService.js
+++ b/api/server/services/PermissionService.js
@@ -141,7 +141,6 @@ const checkPermission = async ({ userId, role, resourceType, resourceId, require
 
     validateResourceType(resourceType);
 
-    // Get all principals for the user (user + groups + public)
     const principals = await getUserPrincipals({ userId, role });
 
     if (principals.length === 0) {
@@ -151,7 +150,6 @@ const checkPermission = async ({ userId, role, resourceType, resourceId, require
     return await hasPermission(principals, resourceType, resourceId, requiredPermission);
   } catch (error) {
     logger.error(`[PermissionService.checkPermission] Error: ${error.message}`);
-    // Re-throw validation errors
     if (error.message.includes('requiredPermission must be')) {
       throw error;
     }
@@ -172,12 +170,12 @@ const getEffectivePermissions = async ({ userId, role, resourceType, resourceId
   try {
     validateResourceType(resourceType);
 
-    // Get all principals for the user (user + groups + public)
     const principals = await getUserPrincipals({ userId, role });
 
     if (principals.length === 0) {
       return 0;
     }
+
     return await getEffectivePermissionsACL(principals, resourceType, resourceId);
   } catch (error) {
     logger.error(`[PermissionService.getEffectivePermissions] Error: ${error.message}`);
diff --git a/api/server/services/ToolService.js b/api/server/services/ToolService.js
index 62d25b23eb..eedb95bd4d 100644
--- a/api/server/services/ToolService.js
+++ b/api/server/services/ToolService.js
@@ -1,24 +1,43 @@
-const { sleep } = require('@librechat/agents');
 const { logger } = require('@librechat/data-schemas');
 const { tool: toolFn, DynamicStructuredTool } = require('@langchain/core/tools');
 const {
+  sleep,
+  EnvVar,
+  StepTypes,
+  GraphEvents,
+  createToolSearch,
+  Constants: AgentConstants,
+  createProgrammaticToolCallingTool,
+} = require('@librechat/agents');
+const {
+  sendEvent,
   getToolkitKey,
   hasCustomUserVars,
   getUserMCPAuthMap,
+  loadToolDefinitions,
+  GenerationJobManager,
   isActionDomainAllowed,
+  buildWebSearchContext,
+  buildImageToolContext,
+  buildToolClassification,
 } = require('@librechat/api');
 const {
+  Time,
   Tools,
+  Constants,
+  CacheKeys,
   ErrorTypes,
   ContentTypes,
   imageGenTools,
   EModelEndpoint,
+  EToolResources,
   actionDelimiter,
   ImageVisionTool,
   openapiToFunction,
   AgentCapabilities,
   isEphemeralAgentId,
   validateActionDomain,
+  actionDomainSeparator,
   defaultAgentCapabilities,
   validateAndParseOpenAPISpec,
 } = require('librechat-data-provider');
@@ -28,14 +47,24 @@ const {
   loadActionSets,
   domainParser,
 } = require('./ActionService');
+const {
+  getEndpointsConfig,
+  getMCPServerTools,
+  getCachedTools,
+} = require('~/server/services/Config');
 const { processFileURL, uploadImageBuffer } = require('~/server/services/Files/process');
-const { getEndpointsConfig, getCachedTools } = require('~/server/services/Config');
+const { primeFiles: primeSearchFiles } = require('~/app/clients/tools/util/fileSearch');
+const { primeFiles: primeCodeFiles } = require('~/server/services/Files/Code/process');
 const { manifestToolMap, toolkits } = require('~/app/clients/tools/manifest');
 const { createOnSearchResults } = require('~/server/services/Tools/search');
+const { loadAuthValues } = require('~/server/services/Tools/credentials');
+const { reinitMCPServer } = require('~/server/services/Tools/mcp');
 const { recordUsage } = require('~/server/services/Threads');
 const { loadTools } = require('~/app/clients/tools/util');
 const { redactMessage } = require('~/config/parsers');
 const { findPluginAuthsByKeys } = require('~/models');
+const { getFlowStateManager } = require('~/config');
+const { getLogStores } = require('~/cache');
 /**
  * Processes the required actions by calling the appropriate tools and returning the outputs.
  * @param {OpenAIClient} client - OpenAI or StreamRunManager Client.
@@ -309,6 +338,7 @@ async function processRequiredActions(client, requiredActions) {
       }
 
       // We've already decrypted the metadata, so we can pass it directly
+      const _allowedDomains = appConfig?.actions?.allowedDomains;
       tool = await createActionTool({
         userId: client.req.user.id,
         res: client.res,
@@ -316,6 +346,7 @@ async function processRequiredActions(client, requiredActions) {
         requestBuilder,
         // Note: intentionally not passing zodSchema, name, and description for assistants API
         encrypted, // Pass the encrypted values for OAuth flow
+        useSSRFProtection: !Array.isArray(_allowedDomains) || _allowedDomains.length === 0,
       });
       if (!tool) {
         logger.warn(
@@ -367,7 +398,390 @@ async function processRequiredActions(client, requiredActions) {
  * @param {AbortSignal} params.signal
  * @param {Pick<Agent, 'id' | 'provider' | 'model' | 'tools'} params.agent - The agent to load tools for.
  * @param {string | undefined} [params.openAIApiKey] - The OpenAI API key.
- * @returns {Promise<{ tools?: StructuredTool[]; userMCPAuthMap?: Record<string, Record<string, string>> }>} The agent tools.
+ * @returns {Promise<{
+ *   tools?: StructuredTool[];
+ *   toolContextMap?: Record<string, unknown>;
+ *   userMCPAuthMap?: Record<string, Record<string, string>>;
+ *   toolRegistry?: Map<string, import('~/utils/toolClassification').LCTool>;
+ *   hasDeferredTools?: boolean;
+ * }>} The agent tools and registry.
+ */
+/** Native LibreChat tools that are not in the manifest */
+const nativeTools = new Set([Tools.execute_code, Tools.file_search, Tools.web_search]);
+
+/** Checks if a tool name is a known built-in tool */
+const isBuiltInTool = (toolName) =>
+  Boolean(
+    manifestToolMap[toolName] ||
+      toolkits.some((t) => t.pluginKey === toolName) ||
+      nativeTools.has(toolName),
+  );
+
+/**
+ * Loads only tool definitions without creating tool instances.
+ * This is the efficient path for event-driven mode where tools are loaded on-demand.
+ *
+ * @param {Object} params
+ * @param {ServerRequest} params.req - The request object
+ * @param {ServerResponse} [params.res] - The response object for SSE events
+ * @param {Object} params.agent - The agent configuration
+ * @param {string|null} [params.streamId] - Stream ID for resumable mode
+ * @returns {Promise<{
+ *   toolDefinitions?: import('@librechat/api').LCTool[];
+ *   toolRegistry?: Map<string, import('@librechat/api').LCTool>;
+ *   userMCPAuthMap?: Record<string, Record<string, string>>;
+ *   hasDeferredTools?: boolean;
+ * }>}
+ */
+async function loadToolDefinitionsWrapper({ req, res, agent, streamId = null, tool_resources }) {
+  if (!agent.tools || agent.tools.length === 0) {
+    return { toolDefinitions: [] };
+  }
+
+  if (
+    agent.tools.length === 1 &&
+    (agent.tools[0] === AgentCapabilities.context || agent.tools[0] === AgentCapabilities.ocr)
+  ) {
+    return { toolDefinitions: [] };
+  }
+
+  const appConfig = req.config;
+  const endpointsConfig = await getEndpointsConfig(req);
+  let enabledCapabilities = new Set(endpointsConfig?.[EModelEndpoint.agents]?.capabilities ?? []);
+
+  if (enabledCapabilities.size === 0 && isEphemeralAgentId(agent.id)) {
+    enabledCapabilities = new Set(
+      appConfig.endpoints?.[EModelEndpoint.agents]?.capabilities ?? defaultAgentCapabilities,
+    );
+  }
+
+  const checkCapability = (capability) => enabledCapabilities.has(capability);
+  const areToolsEnabled = checkCapability(AgentCapabilities.tools);
+  const deferredToolsEnabled = checkCapability(AgentCapabilities.deferred_tools);
+
+  const filteredTools = agent.tools?.filter((tool) => {
+    if (tool === Tools.file_search) {
+      return checkCapability(AgentCapabilities.file_search);
+    }
+    if (tool === Tools.execute_code) {
+      return checkCapability(AgentCapabilities.execute_code);
+    }
+    if (tool === Tools.web_search) {
+      return checkCapability(AgentCapabilities.web_search);
+    }
+    if (!areToolsEnabled && !tool.includes(actionDelimiter)) {
+      return false;
+    }
+    return true;
+  });
+
+  if (!filteredTools || filteredTools.length === 0) {
+    return { toolDefinitions: [] };
+  }
+
+  /** @type {Record<string, Record<string, string>>} */
+  let userMCPAuthMap;
+  if (hasCustomUserVars(req.config)) {
+    userMCPAuthMap = await getUserMCPAuthMap({
+      tools: agent.tools,
+      userId: req.user.id,
+      findPluginAuthsByKeys,
+    });
+  }
+
+  const flowsCache = getLogStores(CacheKeys.FLOWS);
+  const flowManager = getFlowStateManager(flowsCache);
+  const pendingOAuthServers = new Set();
+
+  const createOAuthEmitter = (serverName) => {
+    return async (authURL) => {
+      const flowId = `${req.user.id}:${serverName}:${Date.now()}`;
+      const stepId = 'step_oauth_login_' + serverName;
+      const toolCall = {
+        id: flowId,
+        name: serverName,
+        type: 'tool_call_chunk',
+      };
+
+      const runStepData = {
+        runId: Constants.USE_PRELIM_RESPONSE_MESSAGE_ID,
+        id: stepId,
+        type: StepTypes.TOOL_CALLS,
+        index: 0,
+        stepDetails: {
+          type: StepTypes.TOOL_CALLS,
+          tool_calls: [toolCall],
+        },
+      };
+
+      const runStepDeltaData = {
+        id: stepId,
+        delta: {
+          type: StepTypes.TOOL_CALLS,
+          tool_calls: [{ ...toolCall, args: '' }],
+          auth: authURL,
+          expires_at: Date.now() + Time.TWO_MINUTES,
+        },
+      };
+
+      const runStepEvent = { event: GraphEvents.ON_RUN_STEP, data: runStepData };
+      const runStepDeltaEvent = { event: GraphEvents.ON_RUN_STEP_DELTA, data: runStepDeltaData };
+
+      if (streamId) {
+        await GenerationJobManager.emitChunk(streamId, runStepEvent);
+        await GenerationJobManager.emitChunk(streamId, runStepDeltaEvent);
+      } else if (res && !res.writableEnded) {
+        sendEvent(res, runStepEvent);
+        sendEvent(res, runStepDeltaEvent);
+      } else {
+        logger.warn(
+          `[Tool Definitions] Cannot emit OAuth event for ${serverName}: no streamId and res not available`,
+        );
+      }
+    };
+  };
+
+  const getOrFetchMCPServerTools = async (userId, serverName) => {
+    const cached = await getMCPServerTools(userId, serverName);
+    if (cached) {
+      return cached;
+    }
+
+    const oauthStart = async () => {
+      pendingOAuthServers.add(serverName);
+    };
+
+    const result = await reinitMCPServer({
+      user: req.user,
+      oauthStart,
+      flowManager,
+      serverName,
+      userMCPAuthMap,
+    });
+
+    return result?.availableTools || null;
+  };
+
+  const getActionToolDefinitions = async (agentId, actionToolNames) => {
+    const actionSets = (await loadActionSets({ agent_id: agentId })) ?? [];
+    if (actionSets.length === 0) {
+      return [];
+    }
+
+    const definitions = [];
+    const allowedDomains = appConfig?.actions?.allowedDomains;
+    const domainSeparatorRegex = new RegExp(actionDomainSeparator, 'g');
+
+    for (const action of actionSets) {
+      const domain = await domainParser(action.metadata.domain, true);
+      const normalizedDomain = domain.replace(domainSeparatorRegex, '_');
+
+      const isDomainAllowed = await isActionDomainAllowed(action.metadata.domain, allowedDomains);
+      if (!isDomainAllowed) {
+        logger.warn(
+          `[Actions] Domain "${action.metadata.domain}" not in allowedDomains. ` +
+            `Add it to librechat.yaml actions.allowedDomains to enable this action.`,
+        );
+        continue;
+      }
+
+      const validationResult = validateAndParseOpenAPISpec(action.metadata.raw_spec);
+      if (!validationResult.spec || !validationResult.serverUrl) {
+        logger.warn(`[Actions] Invalid OpenAPI spec for domain: ${domain}`);
+        continue;
+      }
+
+      const { functionSignatures } = openapiToFunction(validationResult.spec, true);
+
+      for (const sig of functionSignatures) {
+        const toolName = `${sig.name}${actionDelimiter}${normalizedDomain}`;
+        if (!actionToolNames.some((name) => name.replace(domainSeparatorRegex, '_') === toolName)) {
+          continue;
+        }
+
+        definitions.push({
+          name: toolName,
+          description: sig.description,
+          parameters: sig.parameters,
+        });
+      }
+    }
+
+    return definitions;
+  };
+
+  let { toolDefinitions, toolRegistry, hasDeferredTools } = await loadToolDefinitions(
+    {
+      userId: req.user.id,
+      agentId: agent.id,
+      tools: filteredTools,
+      toolOptions: agent.tool_options,
+      deferredToolsEnabled,
+    },
+    {
+      isBuiltInTool,
+      loadAuthValues,
+      getOrFetchMCPServerTools,
+      getActionToolDefinitions,
+    },
+  );
+
+  if (pendingOAuthServers.size > 0 && (res || streamId)) {
+    const serverNames = Array.from(pendingOAuthServers);
+    logger.info(
+      `[Tool Definitions] OAuth required for ${serverNames.length} server(s): ${serverNames.join(', ')}. Emitting events and waiting.`,
+    );
+
+    const oauthWaitPromises = serverNames.map(async (serverName) => {
+      try {
+        const result = await reinitMCPServer({
+          user: req.user,
+          serverName,
+          userMCPAuthMap,
+          flowManager,
+          returnOnOAuth: false,
+          oauthStart: createOAuthEmitter(serverName),
+          connectionTimeout: Time.TWO_MINUTES,
+        });
+
+        if (result?.availableTools) {
+          logger.info(`[Tool Definitions] OAuth completed for ${serverName}, tools available`);
+          return { serverName, success: true };
+        }
+        return { serverName, success: false };
+      } catch (error) {
+        logger.debug(`[Tool Definitions] OAuth wait failed for ${serverName}:`, error?.message);
+        return { serverName, success: false };
+      }
+    });
+
+    const results = await Promise.allSettled(oauthWaitPromises);
+    const successfulServers = results
+      .filter((r) => r.status === 'fulfilled' && r.value.success)
+      .map((r) => r.value.serverName);
+
+    if (successfulServers.length > 0) {
+      logger.info(
+        `[Tool Definitions] Reloading tools after OAuth for: ${successfulServers.join(', ')}`,
+      );
+      const reloadResult = await loadToolDefinitions(
+        {
+          userId: req.user.id,
+          agentId: agent.id,
+          tools: filteredTools,
+          toolOptions: agent.tool_options,
+          deferredToolsEnabled,
+        },
+        {
+          isBuiltInTool,
+          loadAuthValues,
+          getOrFetchMCPServerTools,
+          getActionToolDefinitions,
+        },
+      );
+      toolDefinitions = reloadResult.toolDefinitions;
+      toolRegistry = reloadResult.toolRegistry;
+      hasDeferredTools = reloadResult.hasDeferredTools;
+    }
+  }
+
+  /** @type {Record<string, string>} */
+  const toolContextMap = {};
+  const hasWebSearch = filteredTools.includes(Tools.web_search);
+  const hasFileSearch = filteredTools.includes(Tools.file_search);
+  const hasExecuteCode = filteredTools.includes(Tools.execute_code);
+
+  if (hasWebSearch) {
+    toolContextMap[Tools.web_search] = buildWebSearchContext();
+  }
+
+  if (hasExecuteCode && tool_resources) {
+    try {
+      const authValues = await loadAuthValues({
+        userId: req.user.id,
+        authFields: [EnvVar.CODE_API_KEY],
+      });
+      const codeApiKey = authValues[EnvVar.CODE_API_KEY];
+
+      if (codeApiKey) {
+        const { toolContext } = await primeCodeFiles(
+          { req, tool_resources, agentId: agent.id },
+          codeApiKey,
+        );
+        if (toolContext) {
+          toolContextMap[Tools.execute_code] = toolContext;
+        }
+      }
+    } catch (error) {
+      logger.error('[loadToolDefinitionsWrapper] Error priming code files:', error);
+    }
+  }
+
+  if (hasFileSearch && tool_resources) {
+    try {
+      const { toolContext } = await primeSearchFiles({
+        req,
+        tool_resources,
+        agentId: agent.id,
+      });
+      if (toolContext) {
+        toolContextMap[Tools.file_search] = toolContext;
+      }
+    } catch (error) {
+      logger.error('[loadToolDefinitionsWrapper] Error priming search files:', error);
+    }
+  }
+
+  const imageFiles = tool_resources?.[EToolResources.image_edit]?.files ?? [];
+  if (imageFiles.length > 0) {
+    const hasOaiImageGen = filteredTools.includes('image_gen_oai');
+    const hasGeminiImageGen = filteredTools.includes('gemini_image_gen');
+
+    if (hasOaiImageGen) {
+      const toolContext = buildImageToolContext({
+        imageFiles,
+        toolName: `${EToolResources.image_edit}_oai`,
+        contextDescription: 'image editing',
+      });
+      if (toolContext) {
+        toolContextMap.image_edit_oai = toolContext;
+      }
+    }
+
+    if (hasGeminiImageGen) {
+      const toolContext = buildImageToolContext({
+        imageFiles,
+        toolName: 'gemini_image_gen',
+        contextDescription: 'image context',
+      });
+      if (toolContext) {
+        toolContextMap.gemini_image_gen = toolContext;
+      }
+    }
+  }
+
+  return {
+    toolRegistry,
+    userMCPAuthMap,
+    toolContextMap,
+    toolDefinitions,
+    hasDeferredTools,
+  };
+}
+
+/**
+ * Loads agent tools for initialization or execution.
+ * @param {Object} params
+ * @param {ServerRequest} params.req - The request object
+ * @param {ServerResponse} params.res - The response object
+ * @param {Object} params.agent - The agent configuration
+ * @param {AbortSignal} [params.signal] - Abort signal
+ * @param {Object} [params.tool_resources] - Tool resources
+ * @param {string} [params.openAIApiKey] - OpenAI API key
+ * @param {string|null} [params.streamId] - Stream ID for resumable mode
+ * @param {boolean} [params.definitionsOnly=true] - When true, returns only serializable
+ *   tool definitions without creating full tool instances. Use for event-driven mode
+ *   where tools are loaded on-demand during execution.
  */
 async function loadAgentTools({
   req,
@@ -377,16 +791,21 @@ async function loadAgentTools({
   tool_resources,
   openAIApiKey,
   streamId = null,
+  definitionsOnly = true,
 }) {
+  if (definitionsOnly) {
+    return loadToolDefinitionsWrapper({ req, res, agent, streamId, tool_resources });
+  }
+
   if (!agent.tools || agent.tools.length === 0) {
-    return {};
+    return { toolDefinitions: [] };
   } else if (
     agent.tools &&
     agent.tools.length === 1 &&
     /** Legacy handling for `ocr` as may still exist in existing Agents */
     (agent.tools[0] === AgentCapabilities.context || agent.tools[0] === AgentCapabilities.ocr)
   ) {
-    return {};
+    return { toolDefinitions: [] };
   }
 
   const appConfig = req.config;
@@ -401,8 +820,14 @@ async function loadAgentTools({
   const checkCapability = (capability) => {
     const enabled = enabledCapabilities.has(capability);
     if (!enabled) {
+      const isToolCapability = [
+        AgentCapabilities.file_search,
+        AgentCapabilities.execute_code,
+        AgentCapabilities.web_search,
+      ].includes(capability);
+      const suffix = isToolCapability ? ' despite configured tool.' : '.';
       logger.warn(
-        `Capability "${capability}" disabled${capability === AgentCapabilities.tools ? '.' : ' despite configured tool.'} User: ${req.user.id} | Agent: ${agent.id}`,
+        `Capability "${capability}" disabled${suffix} User: ${req.user.id} | Agent: ${agent.id}`,
       );
     }
     return enabled;
@@ -466,6 +891,18 @@ async function loadAgentTools({
     imageOutputType: appConfig.imageOutputType,
   });
 
+  /** Build tool registry from MCP tools and create PTC/tool search tools if configured */
+  const deferredToolsEnabled = checkCapability(AgentCapabilities.deferred_tools);
+  const { toolRegistry, toolDefinitions, additionalTools, hasDeferredTools } =
+    await buildToolClassification({
+      loadedTools,
+      userId: req.user.id,
+      agentId: agent.id,
+      agentToolOptions: agent.tool_options,
+      deferredToolsEnabled,
+      loadAuthValues,
+    });
+
   const agentTools = [];
   for (let i = 0; i < loadedTools.length; i++) {
     const tool = loadedTools[i];
@@ -510,11 +947,16 @@ async function loadAgentTools({
     return map;
   }, {});
 
+  agentTools.push(...additionalTools);
+
   if (!checkCapability(AgentCapabilities.actions)) {
     return {
-      tools: agentTools,
+      toolRegistry,
       userMCPAuthMap,
       toolContextMap,
+      toolDefinitions,
+      hasDeferredTools,
+      tools: agentTools,
     };
   }
 
@@ -524,9 +966,12 @@ async function loadAgentTools({
       logger.warn(`No tools found for the specified tool calls: ${_agentTools.join(', ')}`);
     }
     return {
-      tools: agentTools,
+      toolRegistry,
       userMCPAuthMap,
       toolContextMap,
+      toolDefinitions,
+      hasDeferredTools,
+      tools: agentTools,
     };
   }
 
@@ -621,6 +1066,7 @@ async function loadAgentTools({
     const zodSchema = zodSchemas[functionName];
 
     if (requestBuilder) {
+      const _allowedDomains = appConfig?.actions?.allowedDomains;
       const tool = await createActionTool({
         userId: req.user.id,
         res,
@@ -631,6 +1077,7 @@ async function loadAgentTools({
         name: toolName,
         description: functionSig.description,
         streamId,
+        useSSRFProtection: !Array.isArray(_allowedDomains) || _allowedDomains.length === 0,
       });
 
       if (!tool) {
@@ -651,14 +1098,303 @@ async function loadAgentTools({
   }
 
   return {
-    tools: agentTools,
+    toolRegistry,
     toolContextMap,
     userMCPAuthMap,
+    toolDefinitions,
+    hasDeferredTools,
+    tools: agentTools,
   };
 }
 
+/**
+ * Loads tools for event-driven execution (ON_TOOL_EXECUTE handler).
+ * This function encapsulates all dependencies needed for tool loading,
+ * so callers don't need to import processFileURL, uploadImageBuffer, etc.
+ *
+ * Handles both regular tools (MCP, built-in) and action tools.
+ *
+ * @param {Object} params
+ * @param {ServerRequest} params.req - The request object
+ * @param {ServerResponse} params.res - The response object
+ * @param {AbortSignal} [params.signal] - Abort signal
+ * @param {Object} params.agent - The agent object
+ * @param {string[]} params.toolNames - Names of tools to load
+ * @param {Record<string, Record<string, string>>} [params.userMCPAuthMap] - User MCP auth map
+ * @param {Object} [params.tool_resources] - Tool resources
+ * @param {string|null} [params.streamId] - Stream ID for web search callbacks
+ * @returns {Promise<{ loadedTools: Array, configurable: Object }>}
+ */
+async function loadToolsForExecution({
+  req,
+  res,
+  signal,
+  agent,
+  toolNames,
+  toolRegistry,
+  userMCPAuthMap,
+  tool_resources,
+  streamId = null,
+}) {
+  const appConfig = req.config;
+  const allLoadedTools = [];
+  const configurable = { userMCPAuthMap };
+
+  const isToolSearch = toolNames.includes(AgentConstants.TOOL_SEARCH);
+  const isPTC = toolNames.includes(AgentConstants.PROGRAMMATIC_TOOL_CALLING);
+
+  logger.debug(
+    `[loadToolsForExecution] isToolSearch: ${isToolSearch}, toolRegistry: ${toolRegistry?.size ?? 'undefined'}`,
+  );
+
+  if (isToolSearch && toolRegistry) {
+    const toolSearchTool = createToolSearch({
+      mode: 'local',
+      toolRegistry,
+    });
+    allLoadedTools.push(toolSearchTool);
+    configurable.toolRegistry = toolRegistry;
+  }
+
+  if (isPTC && toolRegistry) {
+    configurable.toolRegistry = toolRegistry;
+    try {
+      const authValues = await loadAuthValues({
+        userId: req.user.id,
+        authFields: [EnvVar.CODE_API_KEY],
+      });
+      const codeApiKey = authValues[EnvVar.CODE_API_KEY];
+
+      if (codeApiKey) {
+        const ptcTool = createProgrammaticToolCallingTool({ apiKey: codeApiKey });
+        allLoadedTools.push(ptcTool);
+      } else {
+        logger.warn('[loadToolsForExecution] PTC requested but CODE_API_KEY not available');
+      }
+    } catch (error) {
+      logger.error('[loadToolsForExecution] Error creating PTC tool:', error);
+    }
+  }
+
+  const specialToolNames = new Set([
+    AgentConstants.TOOL_SEARCH,
+    AgentConstants.PROGRAMMATIC_TOOL_CALLING,
+  ]);
+
+  let ptcOrchestratedToolNames = [];
+  if (isPTC && toolRegistry) {
+    ptcOrchestratedToolNames = Array.from(toolRegistry.keys()).filter(
+      (name) => !specialToolNames.has(name),
+    );
+  }
+
+  const requestedNonSpecialToolNames = toolNames.filter((name) => !specialToolNames.has(name));
+  const allToolNamesToLoad = isPTC
+    ? [...new Set([...requestedNonSpecialToolNames, ...ptcOrchestratedToolNames])]
+    : requestedNonSpecialToolNames;
+
+  const actionToolNames = allToolNamesToLoad.filter((name) => name.includes(actionDelimiter));
+  const regularToolNames = allToolNamesToLoad.filter((name) => !name.includes(actionDelimiter));
+
+  /** @type {Record<string, unknown>} */
+  if (regularToolNames.length > 0) {
+    const includesWebSearch = regularToolNames.includes(Tools.web_search);
+    const webSearchCallbacks = includesWebSearch ? createOnSearchResults(res, streamId) : undefined;
+
+    const { loadedTools } = await loadTools({
+      agent,
+      signal,
+      userMCPAuthMap,
+      functions: true,
+      tools: regularToolNames,
+      user: req.user.id,
+      options: {
+        req,
+        res,
+        tool_resources,
+        processFileURL,
+        uploadImageBuffer,
+        returnMetadata: true,
+        [Tools.web_search]: webSearchCallbacks,
+      },
+      webSearch: appConfig?.webSearch,
+      fileStrategy: appConfig?.fileStrategy,
+      imageOutputType: appConfig?.imageOutputType,
+    });
+
+    if (loadedTools) {
+      allLoadedTools.push(...loadedTools);
+    }
+  }
+
+  if (actionToolNames.length > 0 && agent) {
+    const actionTools = await loadActionToolsForExecution({
+      req,
+      res,
+      agent,
+      appConfig,
+      streamId,
+      actionToolNames,
+    });
+    allLoadedTools.push(...actionTools);
+  }
+
+  if (isPTC && allLoadedTools.length > 0) {
+    const ptcToolMap = new Map();
+    for (const tool of allLoadedTools) {
+      if (tool.name && tool.name !== AgentConstants.PROGRAMMATIC_TOOL_CALLING) {
+        ptcToolMap.set(tool.name, tool);
+      }
+    }
+    configurable.ptcToolMap = ptcToolMap;
+  }
+
+  return {
+    configurable,
+    loadedTools: allLoadedTools,
+  };
+}
+
+/**
+ * Loads action tools for event-driven execution.
+ * @param {Object} params
+ * @param {ServerRequest} params.req - The request object
+ * @param {ServerResponse} params.res - The response object
+ * @param {Object} params.agent - The agent object
+ * @param {Object} params.appConfig - App configuration
+ * @param {string|null} params.streamId - Stream ID
+ * @param {string[]} params.actionToolNames - Action tool names to load
+ * @returns {Promise<Array>} Loaded action tools
+ */
+async function loadActionToolsForExecution({
+  req,
+  res,
+  agent,
+  appConfig,
+  streamId,
+  actionToolNames,
+}) {
+  const loadedActionTools = [];
+
+  const actionSets = (await loadActionSets({ agent_id: agent.id })) ?? [];
+  if (actionSets.length === 0) {
+    return loadedActionTools;
+  }
+
+  const processedActionSets = new Map();
+  const domainMap = new Map();
+  const allowedDomains = appConfig?.actions?.allowedDomains;
+
+  for (const action of actionSets) {
+    const domain = await domainParser(action.metadata.domain, true);
+    domainMap.set(domain, action);
+
+    const isDomainAllowed = await isActionDomainAllowed(action.metadata.domain, allowedDomains);
+    if (!isDomainAllowed) {
+      logger.warn(
+        `[Actions] Domain "${action.metadata.domain}" not in allowedDomains. ` +
+          `Add it to librechat.yaml actions.allowedDomains to enable this action.`,
+      );
+      continue;
+    }
+
+    const validationResult = validateAndParseOpenAPISpec(action.metadata.raw_spec);
+    if (!validationResult.spec || !validationResult.serverUrl) {
+      logger.warn(`[Actions] Invalid OpenAPI spec for domain: ${domain}`);
+      continue;
+    }
+
+    const domainValidation = validateActionDomain(
+      action.metadata.domain,
+      validationResult.serverUrl,
+    );
+    if (!domainValidation.isValid) {
+      logger.error(`Domain mismatch in stored action: ${domainValidation.message}`, {
+        userId: req.user.id,
+        agent_id: agent.id,
+        action_id: action.action_id,
+      });
+      continue;
+    }
+
+    const encrypted = {
+      oauth_client_id: action.metadata.oauth_client_id,
+      oauth_client_secret: action.metadata.oauth_client_secret,
+    };
+
+    const decryptedAction = { ...action };
+    decryptedAction.metadata = await decryptMetadata(action.metadata);
+
+    const { requestBuilders, functionSignatures, zodSchemas } = openapiToFunction(
+      validationResult.spec,
+      true,
+    );
+
+    processedActionSets.set(domain, {
+      action: decryptedAction,
+      requestBuilders,
+      functionSignatures,
+      zodSchemas,
+      encrypted,
+    });
+  }
+
+  const domainSeparatorRegex = new RegExp(actionDomainSeparator, 'g');
+  for (const toolName of actionToolNames) {
+    let currentDomain = '';
+    for (const domain of domainMap.keys()) {
+      const normalizedDomain = domain.replace(domainSeparatorRegex, '_');
+      if (toolName.includes(normalizedDomain)) {
+        currentDomain = domain;
+        break;
+      }
+    }
+
+    if (!currentDomain || !processedActionSets.has(currentDomain)) {
+      continue;
+    }
+
+    const { action, encrypted, zodSchemas, requestBuilders, functionSignatures } =
+      processedActionSets.get(currentDomain);
+    const normalizedDomain = currentDomain.replace(domainSeparatorRegex, '_');
+    const functionName = toolName.replace(`${actionDelimiter}${normalizedDomain}`, '');
+    const functionSig = functionSignatures.find((sig) => sig.name === functionName);
+    const requestBuilder = requestBuilders[functionName];
+    const zodSchema = zodSchemas[functionName];
+
+    if (!requestBuilder) {
+      continue;
+    }
+
+    const tool = await createActionTool({
+      userId: req.user.id,
+      res,
+      action,
+      streamId,
+      zodSchema,
+      encrypted,
+      requestBuilder,
+      name: toolName,
+      description: functionSig?.description ?? '',
+      useSSRFProtection: !Array.isArray(allowedDomains) || allowedDomains.length === 0,
+    });
+
+    if (!tool) {
+      logger.warn(`[Actions] Failed to create action tool: ${toolName}`);
+      continue;
+    }
+
+    loadedActionTools.push(tool);
+  }
+
+  return loadedActionTools;
+}
+
 module.exports = {
+  loadTools,
+  isBuiltInTool,
   getToolkitKey,
   loadAgentTools,
+  loadToolsForExecution,
   processRequiredActions,
 };
diff --git a/api/server/services/Tools/mcp.js b/api/server/services/Tools/mcp.js
index 33e67c8238..10f2d71a18 100644
--- a/api/server/services/Tools/mcp.js
+++ b/api/server/services/Tools/mcp.js
@@ -1,11 +1,14 @@
 const { logger } = require('@librechat/data-schemas');
 const { CacheKeys, Constants } = require('librechat-data-provider');
 const { findToken, createToken, updateToken, deleteTokens } = require('~/models');
-const { getMCPManager, getFlowStateManager } = require('~/config');
 const { updateMCPServerTools } = require('~/server/services/Config');
+const { getMCPManager, getFlowStateManager } = require('~/config');
 const { getLogStores } = require('~/cache');
 
 /**
+ * Reinitializes an MCP server connection and discovers available tools.
+ * When OAuth is required, uses discovery mode to list tools without full authentication
+ * (per MCP spec, tool listing should be possible without auth).
  * @param {Object} params
  * @param {IUser} params.user - The user from the request object.
  * @param {string} params.serverName - The name of the MCP server
@@ -14,7 +17,7 @@ const { getLogStores } = require('~/cache');
  * @param {boolean} [params.forceNew]
  * @param {number} [params.connectionTimeout]
  * @param {FlowStateManager<any>} [params.flowManager]
- * @param {(authURL: string) => Promise<boolean>} [params.oauthStart]
+ * @param {(authURL: string) => Promise<void>} [params.oauthStart]
  * @param {Record<string, Record<string, string>>} [params.userMCPAuthMap]
  */
 async function reinitMCPServer({
@@ -36,10 +39,12 @@ async function reinitMCPServer({
   let tools = null;
   let oauthRequired = false;
   let oauthUrl = null;
+
   try {
     const customUserVars = userMCPAuthMap?.[`${Constants.mcp_prefix}${serverName}`];
     const flowManager = _flowManager ?? getFlowStateManager(getLogStores(CacheKeys.FLOWS));
     const mcpManager = getMCPManager();
+    const tokenMethods = { findToken, updateToken, createToken, deleteTokens };
 
     const oauthStart =
       _oauthStart ??
@@ -57,15 +62,10 @@ async function reinitMCPServer({
         oauthStart,
         serverName,
         flowManager,
+        tokenMethods,
         returnOnOAuth,
         customUserVars,
         connectionTimeout,
-        tokenMethods: {
-          findToken,
-          updateToken,
-          createToken,
-          deleteTokens,
-        },
       });
 
       logger.info(`[MCP Reinitialize] Successfully established connection for ${serverName}`);
@@ -84,9 +84,33 @@ async function reinitMCPServer({
 
       if (isOAuthError || oauthRequired || isOAuthFlowInitiated) {
         logger.info(
-          `[MCP Reinitialize] OAuth required for ${serverName} (isOAuthError: ${isOAuthError}, oauthRequired: ${oauthRequired}, isOAuthFlowInitiated: ${isOAuthFlowInitiated})`,
+          `[MCP Reinitialize] OAuth required for ${serverName}, attempting tool discovery without auth`,
         );
         oauthRequired = true;
+
+        try {
+          const discoveryResult = await mcpManager.discoverServerTools({
+            user,
+            signal,
+            serverName,
+            flowManager,
+            tokenMethods,
+            oauthStart,
+            customUserVars,
+            connectionTimeout,
+          });
+
+          if (discoveryResult.tools && discoveryResult.tools.length > 0) {
+            tools = discoveryResult.tools;
+            logger.info(
+              `[MCP Reinitialize] Discovered ${tools.length} tools for ${serverName} without full auth`,
+            );
+          }
+        } catch (discoveryErr) {
+          logger.debug(
+            `[MCP Reinitialize] Tool discovery failed for ${serverName}: ${discoveryErr?.message ?? String(discoveryErr)}`,
+          );
+        }
       } else {
         logger.error(
           `[MCP Reinitialize] Error initializing MCP server ${serverName} for user:`,
@@ -97,6 +121,9 @@ async function reinitMCPServer({
 
     if (connection && !oauthRequired) {
       tools = await connection.fetchTools();
+    }
+
+    if (tools && tools.length > 0) {
       availableTools = await updateMCPServerTools({
         userId: user.id,
         serverName,
@@ -109,6 +136,9 @@ async function reinitMCPServer({
     );
 
     const getResponseMessage = () => {
+      if (oauthRequired && tools && tools.length > 0) {
+        return `MCP server '${serverName}' tools discovered, OAuth required for execution`;
+      }
       if (oauthRequired) {
         return `MCP server '${serverName}' ready for OAuth authentication`;
       }
@@ -120,19 +150,25 @@ async function reinitMCPServer({
 
     const result = {
       availableTools,
-      success: Boolean((connection && !oauthRequired) || (oauthRequired && oauthUrl)),
+      success: Boolean(
+        (connection && !oauthRequired) ||
+          (oauthRequired && oauthUrl) ||
+          (tools && tools.length > 0),
+      ),
       message: getResponseMessage(),
       oauthRequired,
       serverName,
       oauthUrl,
       tools,
     };
+
     logger.debug(`[MCP Reinitialize] Response for ${serverName}:`, {
       success: result.success,
       oauthRequired: result.oauthRequired,
       oauthUrl: result.oauthUrl ? 'present' : null,
       toolsCount: tools?.length ?? 0,
     });
+
     return result;
   } catch (error) {
     logger.error(
diff --git a/api/server/services/__tests__/ToolService.spec.js b/api/server/services/__tests__/ToolService.spec.js
new file mode 100644
index 0000000000..2f00bbc3d6
--- /dev/null
+++ b/api/server/services/__tests__/ToolService.spec.js
@@ -0,0 +1,149 @@
+const { AgentCapabilities, defaultAgentCapabilities } = require('librechat-data-provider');
+
+/**
+ * Tests for ToolService capability checking logic.
+ * The actual loadAgentTools function has many dependencies, so we test
+ * the capability checking logic in isolation.
+ */
+describe('ToolService - Capability Checking', () => {
+  describe('checkCapability logic', () => {
+    /**
+     * Simulates the checkCapability function from loadAgentTools
+     */
+    const createCheckCapability = (enabledCapabilities, logger = { warn: jest.fn() }) => {
+      return (capability) => {
+        const enabled = enabledCapabilities.has(capability);
+        if (!enabled) {
+          const isToolCapability = [
+            AgentCapabilities.file_search,
+            AgentCapabilities.execute_code,
+            AgentCapabilities.web_search,
+          ].includes(capability);
+          const suffix = isToolCapability ? ' despite configured tool.' : '.';
+          logger.warn(`Capability "${capability}" disabled${suffix}`);
+        }
+        return enabled;
+      };
+    };
+
+    it('should return true when capability is enabled', () => {
+      const enabledCapabilities = new Set([AgentCapabilities.deferred_tools]);
+      const checkCapability = createCheckCapability(enabledCapabilities);
+
+      expect(checkCapability(AgentCapabilities.deferred_tools)).toBe(true);
+    });
+
+    it('should return false when capability is not enabled', () => {
+      const enabledCapabilities = new Set([]);
+      const checkCapability = createCheckCapability(enabledCapabilities);
+
+      expect(checkCapability(AgentCapabilities.deferred_tools)).toBe(false);
+    });
+
+    it('should log warning with "despite configured tool" for tool capabilities', () => {
+      const logger = { warn: jest.fn() };
+      const enabledCapabilities = new Set([]);
+      const checkCapability = createCheckCapability(enabledCapabilities, logger);
+
+      checkCapability(AgentCapabilities.file_search);
+      expect(logger.warn).toHaveBeenCalledWith(expect.stringContaining('despite configured tool'));
+
+      logger.warn.mockClear();
+      checkCapability(AgentCapabilities.execute_code);
+      expect(logger.warn).toHaveBeenCalledWith(expect.stringContaining('despite configured tool'));
+
+      logger.warn.mockClear();
+      checkCapability(AgentCapabilities.web_search);
+      expect(logger.warn).toHaveBeenCalledWith(expect.stringContaining('despite configured tool'));
+    });
+
+    it('should log warning without "despite configured tool" for non-tool capabilities', () => {
+      const logger = { warn: jest.fn() };
+      const enabledCapabilities = new Set([]);
+      const checkCapability = createCheckCapability(enabledCapabilities, logger);
+
+      checkCapability(AgentCapabilities.deferred_tools);
+      expect(logger.warn).toHaveBeenCalledWith(
+        expect.stringContaining('Capability "deferred_tools" disabled.'),
+      );
+      expect(logger.warn).not.toHaveBeenCalledWith(
+        expect.stringContaining('despite configured tool'),
+      );
+
+      logger.warn.mockClear();
+      checkCapability(AgentCapabilities.tools);
+      expect(logger.warn).toHaveBeenCalledWith(
+        expect.stringContaining('Capability "tools" disabled.'),
+      );
+      expect(logger.warn).not.toHaveBeenCalledWith(
+        expect.stringContaining('despite configured tool'),
+      );
+
+      logger.warn.mockClear();
+      checkCapability(AgentCapabilities.actions);
+      expect(logger.warn).toHaveBeenCalledWith(
+        expect.stringContaining('Capability "actions" disabled.'),
+      );
+    });
+
+    it('should not log warning when capability is enabled', () => {
+      const logger = { warn: jest.fn() };
+      const enabledCapabilities = new Set([
+        AgentCapabilities.deferred_tools,
+        AgentCapabilities.file_search,
+      ]);
+      const checkCapability = createCheckCapability(enabledCapabilities, logger);
+
+      checkCapability(AgentCapabilities.deferred_tools);
+      checkCapability(AgentCapabilities.file_search);
+
+      expect(logger.warn).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('defaultAgentCapabilities', () => {
+    it('should include deferred_tools capability by default', () => {
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.deferred_tools);
+    });
+
+    it('should include all expected default capabilities', () => {
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.execute_code);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.file_search);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.web_search);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.artifacts);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.actions);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.context);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.tools);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.chain);
+      expect(defaultAgentCapabilities).toContain(AgentCapabilities.ocr);
+    });
+  });
+
+  describe('deferredToolsEnabled integration', () => {
+    it('should correctly determine deferredToolsEnabled from capabilities set', () => {
+      const createCheckCapability = (enabledCapabilities) => {
+        return (capability) => enabledCapabilities.has(capability);
+      };
+
+      // When deferred_tools is in capabilities
+      const withDeferred = new Set([AgentCapabilities.deferred_tools, AgentCapabilities.tools]);
+      const checkWithDeferred = createCheckCapability(withDeferred);
+      expect(checkWithDeferred(AgentCapabilities.deferred_tools)).toBe(true);
+
+      // When deferred_tools is NOT in capabilities
+      const withoutDeferred = new Set([AgentCapabilities.tools, AgentCapabilities.actions]);
+      const checkWithoutDeferred = createCheckCapability(withoutDeferred);
+      expect(checkWithoutDeferred(AgentCapabilities.deferred_tools)).toBe(false);
+    });
+
+    it('should use defaultAgentCapabilities when no capabilities configured', () => {
+      // Simulates the fallback behavior in loadAgentTools
+      const endpointsConfig = {}; // No capabilities configured
+      const enabledCapabilities = new Set(
+        endpointsConfig?.capabilities ?? defaultAgentCapabilities,
+      );
+
+      expect(enabledCapabilities.has(AgentCapabilities.deferred_tools)).toBe(true);
+    });
+  });
+});
diff --git a/api/server/services/start/tools.js b/api/server/services/start/tools.js
index dd2d69b274..8dc8475f7f 100644
--- a/api/server/services/start/tools.js
+++ b/api/server/services/start/tools.js
@@ -107,22 +107,33 @@ function loadAndFormatTools({ directory, adminFilter = [], adminIncluded = [] })
   }, {});
 }
 
+/**
+ * Checks if a schema is a Zod schema by looking for the _def property
+ * @param {unknown} schema - The schema to check
+ * @returns {boolean} True if it's a Zod schema
+ */
+function isZodSchema(schema) {
+  return schema && typeof schema === 'object' && '_def' in schema;
+}
+
 /**
  * Formats a `StructuredTool` instance into a format that is compatible
  * with OpenAI's ChatCompletionFunctions. It uses the `zodToJsonSchema`
  * function to convert the schema of the `StructuredTool` into a JSON
  * schema, which is then used as the parameters for the OpenAI function.
+ * If the schema is already a JSON schema, it is used directly.
  *
  * @param {StructuredTool} tool - The StructuredTool to format.
  * @returns {FunctionTool} The OpenAI Assistant Tool.
  */
 function formatToOpenAIAssistantTool(tool) {
+  const parameters = isZodSchema(tool.schema) ? zodToJsonSchema(tool.schema) : tool.schema;
   return {
     type: Tools.function,
     [Tools.function]: {
       name: tool.name,
       description: tool.description,
-      parameters: zodToJsonSchema(tool.schema),
+      parameters,
     },
   };
 }
diff --git a/api/server/socialLogins.js b/api/server/socialLogins.js
index 0a89313ba9..a84c33bd52 100644
--- a/api/server/socialLogins.js
+++ b/api/server/socialLogins.js
@@ -1,8 +1,8 @@
 const passport = require('passport');
 const session = require('express-session');
-const { isEnabled } = require('@librechat/api');
-const { logger } = require('@librechat/data-schemas');
 const { CacheKeys } = require('librechat-data-provider');
+const { isEnabled, shouldUseSecureCookie } = require('@librechat/api');
+const { logger, DEFAULT_SESSION_EXPIRY } = require('@librechat/data-schemas');
 const {
   openIdJwtLogin,
   facebookLogin,
@@ -22,11 +22,16 @@ const { getLogStores } = require('~/cache');
  */
 async function configureOpenId(app) {
   logger.info('Configuring OpenID Connect...');
+  const sessionExpiry = Number(process.env.SESSION_EXPIRY) || DEFAULT_SESSION_EXPIRY;
   const sessionOptions = {
     secret: process.env.OPENID_SESSION_SECRET,
     resave: false,
     saveUninitialized: false,
     store: getLogStores(CacheKeys.OPENID_SESSION),
+    cookie: {
+      maxAge: sessionExpiry,
+      secure: shouldUseSecureCookie(),
+    },
   };
   app.use(session(sessionOptions));
   app.use(passport.session());
@@ -82,11 +87,16 @@ const configureSocialLogins = async (app) => {
     process.env.SAML_SESSION_SECRET
   ) {
     logger.info('Configuring SAML Connect...');
+    const sessionExpiry = Number(process.env.SESSION_EXPIRY) || DEFAULT_SESSION_EXPIRY;
     const sessionOptions = {
       secret: process.env.SAML_SESSION_SECRET,
       resave: false,
       saveUninitialized: false,
       store: getLogStores(CacheKeys.SAML_SESSION),
+      cookie: {
+        maxAge: sessionExpiry,
+        secure: shouldUseSecureCookie(),
+      },
     };
     app.use(session(sessionOptions));
     app.use(passport.session());
diff --git a/api/strategies/index.js b/api/strategies/index.js
index 725e04224a..b4f7bd3cac 100644
--- a/api/strategies/index.js
+++ b/api/strategies/index.js
@@ -1,14 +1,14 @@
-const appleLogin = require('./appleStrategy');
+const { setupOpenId, getOpenIdConfig } = require('./openidStrategy');
+const openIdJwtLogin = require('./openIdJwtStrategy');
+const facebookLogin = require('./facebookStrategy');
+const discordLogin = require('./discordStrategy');
 const passportLogin = require('./localStrategy');
 const googleLogin = require('./googleStrategy');
 const githubLogin = require('./githubStrategy');
-const discordLogin = require('./discordStrategy');
-const facebookLogin = require('./facebookStrategy');
-const { setupOpenId, getOpenIdConfig } = require('./openidStrategy');
-const jwtLogin = require('./jwtStrategy');
-const ldapLogin = require('./ldapStrategy');
 const { setupSaml } = require('./samlStrategy');
-const openIdJwtLogin = require('./openIdJwtStrategy');
+const appleLogin = require('./appleStrategy');
+const ldapLogin = require('./ldapStrategy');
+const jwtLogin = require('./jwtStrategy');
 
 module.exports = {
   appleLogin,
diff --git a/api/strategies/openIdJwtStrategy.js b/api/strategies/openIdJwtStrategy.js
index df318ca30e..997dcec397 100644
--- a/api/strategies/openIdJwtStrategy.js
+++ b/api/strategies/openIdJwtStrategy.js
@@ -84,19 +84,21 @@ const openIdJwtLogin = (openIdConfig) => {
           /** Read tokens from session (server-side) to avoid large cookie issues */
           const sessionTokens = req.session?.openidTokens;
           let accessToken = sessionTokens?.accessToken;
+          let idToken = sessionTokens?.idToken;
           let refreshToken = sessionTokens?.refreshToken;
 
           /** Fallback to cookies for backward compatibility */
-          if (!accessToken || !refreshToken) {
+          if (!accessToken || !refreshToken || !idToken) {
             const cookieHeader = req.headers.cookie;
             const parsedCookies = cookieHeader ? cookies.parse(cookieHeader) : {};
             accessToken = accessToken || parsedCookies.openid_access_token;
+            idToken = idToken || parsedCookies.openid_id_token;
             refreshToken = refreshToken || parsedCookies.refreshToken;
           }
 
           user.federatedTokens = {
             access_token: accessToken || rawToken,
-            id_token: rawToken,
+            id_token: idToken,
             refresh_token: refreshToken,
             expires_at: payload.exp,
           };
diff --git a/api/strategies/openIdJwtStrategy.spec.js b/api/strategies/openIdJwtStrategy.spec.js
new file mode 100644
index 0000000000..566afe5a90
--- /dev/null
+++ b/api/strategies/openIdJwtStrategy.spec.js
@@ -0,0 +1,183 @@
+const { SystemRoles } = require('librechat-data-provider');
+
+// --- Capture the verify callback from JwtStrategy ---
+let capturedVerifyCallback;
+jest.mock('passport-jwt', () => ({
+  Strategy: jest.fn((_opts, verifyCallback) => {
+    capturedVerifyCallback = verifyCallback;
+    return { name: 'jwt' };
+  }),
+  ExtractJwt: {
+    fromAuthHeaderAsBearerToken: jest.fn(() => 'mock-extractor'),
+  },
+}));
+jest.mock('jwks-rsa', () => ({
+  passportJwtSecret: jest.fn(() => 'mock-secret-provider'),
+}));
+jest.mock('https-proxy-agent', () => ({
+  HttpsProxyAgent: jest.fn(),
+}));
+jest.mock('@librechat/data-schemas', () => ({
+  logger: { info: jest.fn(), warn: jest.fn(), debug: jest.fn(), error: jest.fn() },
+}));
+jest.mock('@librechat/api', () => ({
+  isEnabled: jest.fn(() => false),
+  findOpenIDUser: jest.fn(),
+  math: jest.fn((val, fallback) => fallback),
+}));
+jest.mock('~/models', () => ({
+  findUser: jest.fn(),
+  updateUser: jest.fn(),
+}));
+
+const { findOpenIDUser } = require('@librechat/api');
+const { updateUser } = require('~/models');
+const openIdJwtLogin = require('./openIdJwtStrategy');
+
+// Helper: build a mock openIdConfig
+const mockOpenIdConfig = {
+  serverMetadata: () => ({ jwks_uri: 'https://example.com/.well-known/jwks.json' }),
+};
+
+// Helper: invoke the captured verify callback
+async function invokeVerify(req, payload) {
+  return new Promise((resolve, reject) => {
+    capturedVerifyCallback(req, payload, (err, user, info) => {
+      if (err) {
+        return reject(err);
+      }
+      resolve({ user, info });
+    });
+  });
+}
+
+describe('openIdJwtStrategy – token source handling', () => {
+  const baseUser = {
+    _id: { toString: () => 'user-abc' },
+    role: SystemRoles.USER,
+    provider: 'openid',
+  };
+
+  const payload = { sub: 'oidc-123', email: 'test@example.com', exp: 9999999999 };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    findOpenIDUser.mockResolvedValue({ user: { ...baseUser }, error: null, migration: false });
+    updateUser.mockResolvedValue({});
+
+    // Initialize the strategy so capturedVerifyCallback is set
+    openIdJwtLogin(mockOpenIdConfig);
+  });
+
+  it('should read all tokens from session when available', async () => {
+    const req = {
+      headers: { authorization: 'Bearer raw-bearer-token' },
+      session: {
+        openidTokens: {
+          accessToken: 'session-access',
+          idToken: 'session-id',
+          refreshToken: 'session-refresh',
+        },
+      },
+    };
+
+    const { user } = await invokeVerify(req, payload);
+
+    expect(user.federatedTokens).toEqual({
+      access_token: 'session-access',
+      id_token: 'session-id',
+      refresh_token: 'session-refresh',
+      expires_at: payload.exp,
+    });
+  });
+
+  it('should fall back to cookies when session is absent', async () => {
+    const req = {
+      headers: {
+        authorization: 'Bearer raw-bearer-token',
+        cookie:
+          'openid_access_token=cookie-access; openid_id_token=cookie-id; refreshToken=cookie-refresh',
+      },
+    };
+
+    const { user } = await invokeVerify(req, payload);
+
+    expect(user.federatedTokens).toEqual({
+      access_token: 'cookie-access',
+      id_token: 'cookie-id',
+      refresh_token: 'cookie-refresh',
+      expires_at: payload.exp,
+    });
+  });
+
+  it('should fall back to cookie for idToken only when session lacks it', async () => {
+    const req = {
+      headers: {
+        authorization: 'Bearer raw-bearer-token',
+        cookie: 'openid_id_token=cookie-id',
+      },
+      session: {
+        openidTokens: {
+          accessToken: 'session-access',
+          // idToken intentionally missing
+          refreshToken: 'session-refresh',
+        },
+      },
+    };
+
+    const { user } = await invokeVerify(req, payload);
+
+    expect(user.federatedTokens).toEqual({
+      access_token: 'session-access',
+      id_token: 'cookie-id',
+      refresh_token: 'session-refresh',
+      expires_at: payload.exp,
+    });
+  });
+
+  it('should use raw Bearer token as access_token fallback when neither session nor cookie has one', async () => {
+    const req = {
+      headers: {
+        authorization: 'Bearer raw-bearer-token',
+        cookie: 'openid_id_token=cookie-id; refreshToken=cookie-refresh',
+      },
+    };
+
+    const { user } = await invokeVerify(req, payload);
+
+    expect(user.federatedTokens.access_token).toBe('raw-bearer-token');
+    expect(user.federatedTokens.id_token).toBe('cookie-id');
+    expect(user.federatedTokens.refresh_token).toBe('cookie-refresh');
+  });
+
+  it('should set id_token to undefined when not available in session or cookies', async () => {
+    const req = {
+      headers: {
+        authorization: 'Bearer raw-bearer-token',
+        cookie: 'openid_access_token=cookie-access; refreshToken=cookie-refresh',
+      },
+    };
+
+    const { user } = await invokeVerify(req, payload);
+
+    expect(user.federatedTokens.access_token).toBe('cookie-access');
+    expect(user.federatedTokens.id_token).toBeUndefined();
+    expect(user.federatedTokens.refresh_token).toBe('cookie-refresh');
+  });
+
+  it('should keep id_token and access_token as distinct values from cookies', async () => {
+    const req = {
+      headers: {
+        authorization: 'Bearer raw-bearer-token',
+        cookie:
+          'openid_access_token=the-access-token; openid_id_token=the-id-token; refreshToken=the-refresh',
+      },
+    };
+
+    const { user } = await invokeVerify(req, payload);
+
+    expect(user.federatedTokens.access_token).toBe('the-access-token');
+    expect(user.federatedTokens.id_token).toBe('the-id-token');
+    expect(user.federatedTokens.access_token).not.toBe(user.federatedTokens.id_token);
+  });
+});
diff --git a/api/strategies/openidStrategy.js b/api/strategies/openidStrategy.js
index a4369e601b..198c8735ae 100644
--- a/api/strategies/openidStrategy.js
+++ b/api/strategies/openidStrategy.js
@@ -6,8 +6,8 @@ const client = require('openid-client');
 const jwtDecode = require('jsonwebtoken/decode');
 const { HttpsProxyAgent } = require('https-proxy-agent');
 const { hashToken, logger } = require('@librechat/data-schemas');
-const { CacheKeys, ErrorTypes } = require('librechat-data-provider');
 const { Strategy: OpenIDStrategy } = require('openid-client/passport');
+const { CacheKeys, ErrorTypes, SystemRoles } = require('librechat-data-provider');
 const {
   isEnabled,
   logHeaders,
@@ -287,6 +287,367 @@ function convertToUsername(input, defaultValue = '') {
   return defaultValue;
 }
 
+/**
+ * Resolve Azure AD groups when group overage is in effect (groups moved to _claim_names/_claim_sources).
+ *
+ * NOTE: Microsoft recommends treating _claim_names/_claim_sources as a signal only and using Microsoft Graph
+ * to resolve group membership instead of calling the endpoint in _claim_sources directly.
+ *
+ * @param {string} accessToken - Access token with Microsoft Graph permissions
+ * @returns {Promise<string[] | null>} Resolved group IDs or null on failure
+ * @see https://learn.microsoft.com/en-us/entra/identity-platform/access-token-claims-reference#groups-overage-claim
+ * @see https://learn.microsoft.com/en-us/graph/api/directoryobject-getmemberobjects
+ */
+async function resolveGroupsFromOverage(accessToken) {
+  try {
+    if (!accessToken) {
+      logger.error('[openidStrategy] Access token missing; cannot resolve group overage');
+      return null;
+    }
+
+    // Use /me/getMemberObjects so least-privileged delegated permission User.Read is sufficient
+    // when resolving the signed-in user's group membership.
+    const url = 'https://graph.microsoft.com/v1.0/me/getMemberObjects';
+
+    logger.debug(
+      `[openidStrategy] Detected group overage, resolving groups via Microsoft Graph getMemberObjects: ${url}`,
+    );
+
+    const fetchOptions = {
+      method: 'POST',
+      headers: {
+        Authorization: `Bearer ${accessToken}`,
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({ securityEnabledOnly: false }),
+    };
+
+    if (process.env.PROXY) {
+      const { ProxyAgent } = undici;
+      fetchOptions.dispatcher = new ProxyAgent(process.env.PROXY);
+    }
+
+    const response = await undici.fetch(url, fetchOptions);
+    if (!response.ok) {
+      logger.error(
+        `[openidStrategy] Failed to resolve groups via Microsoft Graph getMemberObjects: HTTP ${response.status} ${response.statusText}`,
+      );
+      return null;
+    }
+
+    const data = await response.json();
+    const values = Array.isArray(data?.value) ? data.value : null;
+    if (!values) {
+      logger.error(
+        '[openidStrategy] Unexpected response format when resolving groups via Microsoft Graph getMemberObjects',
+      );
+      return null;
+    }
+    const groupIds = values.filter((id) => typeof id === 'string');
+
+    logger.debug(
+      `[openidStrategy] Successfully resolved ${groupIds.length} groups via Microsoft Graph getMemberObjects`,
+    );
+    return groupIds;
+  } catch (err) {
+    logger.error(
+      '[openidStrategy] Error resolving groups via Microsoft Graph getMemberObjects:',
+      err,
+    );
+    return null;
+  }
+}
+
+/**
+ * Process OpenID authentication tokenset and userinfo
+ * This is the core logic extracted from the passport strategy callback
+ * Can be reused by both the passport strategy and proxy authentication
+ *
+ * @param {Object} tokenset - The OpenID tokenset containing access_token, id_token, etc.
+ * @param {boolean} existingUsersOnly - If true, only existing users will be processed
+ * @returns {Promise<Object>} The authenticated user object with tokenset
+ */
+async function processOpenIDAuth(tokenset, existingUsersOnly = false) {
+  const claims = tokenset.claims ? tokenset.claims() : tokenset;
+  const userinfo = {
+    ...claims,
+  };
+
+  if (tokenset.access_token) {
+    const providerUserinfo = await getUserInfo(openidConfig, tokenset.access_token, claims.sub);
+    Object.assign(userinfo, providerUserinfo);
+  }
+
+  const appConfig = await getAppConfig();
+  /** Azure AD sometimes doesn't return email, use preferred_username as fallback */
+  const email = userinfo.email || userinfo.preferred_username || userinfo.upn;
+  if (!isEmailDomainAllowed(email, appConfig?.registration?.allowedDomains)) {
+    logger.error(
+      `[OpenID Strategy] Authentication blocked - email domain not allowed [Email: ${userinfo.email}]`,
+    );
+    throw new Error('Email domain not allowed');
+  }
+
+  const result = await findOpenIDUser({
+    findUser,
+    email: email,
+    openidId: claims.sub || userinfo.sub,
+    idOnTheSource: claims.oid || userinfo.oid,
+    strategyName: 'openidStrategy',
+  });
+  let user = result.user;
+  const error = result.error;
+
+  if (error) {
+    throw new Error(ErrorTypes.AUTH_FAILED);
+  }
+
+  const fullName = getFullName(userinfo);
+
+  const requiredRole = process.env.OPENID_REQUIRED_ROLE;
+  if (requiredRole) {
+    const requiredRoles = requiredRole
+      .split(',')
+      .map((role) => role.trim())
+      .filter(Boolean);
+    const requiredRoleParameterPath = process.env.OPENID_REQUIRED_ROLE_PARAMETER_PATH;
+    const requiredRoleTokenKind = process.env.OPENID_REQUIRED_ROLE_TOKEN_KIND;
+
+    let decodedToken = '';
+    if (requiredRoleTokenKind === 'access' && tokenset.access_token) {
+      decodedToken = jwtDecode(tokenset.access_token);
+    } else if (requiredRoleTokenKind === 'id' && tokenset.id_token) {
+      decodedToken = jwtDecode(tokenset.id_token);
+    }
+
+    let roles = get(decodedToken, requiredRoleParameterPath);
+
+    // Handle Azure AD group overage for ID token groups: when hasgroups or _claim_* indicate overage,
+    // resolve groups via Microsoft Graph instead of relying on token group values.
+    if (
+      !Array.isArray(roles) &&
+      typeof roles !== 'string' &&
+      requiredRoleTokenKind === 'id' &&
+      requiredRoleParameterPath === 'groups' &&
+      decodedToken &&
+      (decodedToken.hasgroups ||
+        (decodedToken._claim_names?.groups &&
+          decodedToken._claim_sources?.[decodedToken._claim_names.groups]))
+    ) {
+      const overageGroups = await resolveGroupsFromOverage(tokenset.access_token);
+      if (overageGroups) {
+        roles = overageGroups;
+      }
+    }
+
+    if (!roles || (!Array.isArray(roles) && typeof roles !== 'string')) {
+      logger.error(
+        `[openidStrategy] Key '${requiredRoleParameterPath}' not found in ${requiredRoleTokenKind} token!`,
+      );
+      const rolesList =
+        requiredRoles.length === 1
+          ? `"${requiredRoles[0]}"`
+          : `one of: ${requiredRoles.map((r) => `"${r}"`).join(', ')}`;
+      throw new Error(`You must have ${rolesList} role to log in.`);
+    }
+
+    const roleValues = Array.isArray(roles) ? roles : [roles];
+
+    if (!requiredRoles.some((role) => roleValues.includes(role))) {
+      const rolesList =
+        requiredRoles.length === 1
+          ? `"${requiredRoles[0]}"`
+          : `one of: ${requiredRoles.map((r) => `"${r}"`).join(', ')}`;
+      throw new Error(`You must have ${rolesList} role to log in.`);
+    }
+  }
+
+  let username = '';
+  if (process.env.OPENID_USERNAME_CLAIM) {
+    username = userinfo[process.env.OPENID_USERNAME_CLAIM];
+  } else {
+    username = convertToUsername(
+      userinfo.preferred_username || userinfo.username || userinfo.email,
+    );
+  }
+
+  if (existingUsersOnly && !user) {
+    throw new Error('User does not exist');
+  }
+
+  if (!user) {
+    user = {
+      provider: 'openid',
+      openidId: userinfo.sub,
+      username,
+      email: email || '',
+      emailVerified: userinfo.email_verified || false,
+      name: fullName,
+      idOnTheSource: userinfo.oid,
+    };
+
+    const balanceConfig = getBalanceConfig(appConfig);
+    user = await createUser(user, balanceConfig, true, true);
+  } else {
+    user.provider = 'openid';
+    user.openidId = userinfo.sub;
+    user.username = username;
+    user.name = fullName;
+    user.idOnTheSource = userinfo.oid;
+    if (email && email !== user.email) {
+      user.email = email;
+      user.emailVerified = userinfo.email_verified || false;
+    }
+  }
+
+  const adminRole = process.env.OPENID_ADMIN_ROLE;
+  const adminRoleParameterPath = process.env.OPENID_ADMIN_ROLE_PARAMETER_PATH;
+  const adminRoleTokenKind = process.env.OPENID_ADMIN_ROLE_TOKEN_KIND;
+
+  if (adminRole && adminRoleParameterPath && adminRoleTokenKind) {
+    let adminRoleObject;
+    switch (adminRoleTokenKind) {
+      case 'access':
+        adminRoleObject = jwtDecode(tokenset.access_token);
+        break;
+      case 'id':
+        adminRoleObject = jwtDecode(tokenset.id_token);
+        break;
+      case 'userinfo':
+        adminRoleObject = userinfo;
+        break;
+      default:
+        logger.error(
+          `[openidStrategy] Invalid admin role token kind: ${adminRoleTokenKind}. Must be one of 'access', 'id', or 'userinfo'.`,
+        );
+        throw new Error('Invalid admin role token kind');
+    }
+
+    const adminRoles = get(adminRoleObject, adminRoleParameterPath);
+
+    if (
+      adminRoles &&
+      (adminRoles === true ||
+        adminRoles === adminRole ||
+        (Array.isArray(adminRoles) && adminRoles.includes(adminRole)))
+    ) {
+      user.role = SystemRoles.ADMIN;
+      logger.info(`[openidStrategy] User ${username} is an admin based on role: ${adminRole}`);
+    } else if (user.role === SystemRoles.ADMIN) {
+      user.role = SystemRoles.USER;
+      logger.info(
+        `[openidStrategy] User ${username} demoted from admin - role no longer present in token`,
+      );
+    }
+  }
+
+  if (!!userinfo && userinfo.picture && !user.avatar?.includes('manual=true')) {
+    /** @type {string | undefined} */
+    const imageUrl = userinfo.picture;
+
+    let fileName;
+    if (crypto) {
+      fileName = (await hashToken(userinfo.sub)) + '.png';
+    } else {
+      fileName = userinfo.sub + '.png';
+    }
+
+    const imageBuffer = await downloadImage(
+      imageUrl,
+      openidConfig,
+      tokenset.access_token,
+      userinfo.sub,
+    );
+    if (imageBuffer) {
+      const { saveBuffer } = getStrategyFunctions(
+        appConfig?.fileStrategy ?? process.env.CDN_PROVIDER,
+      );
+      const imagePath = await saveBuffer({
+        fileName,
+        userId: user._id.toString(),
+        buffer: imageBuffer,
+      });
+      user.avatar = imagePath ?? '';
+    }
+  }
+
+  user = await updateUser(user._id, user);
+
+  logger.info(
+    `[openidStrategy] login success openidId: ${user.openidId} | email: ${user.email} | username: ${user.username} `,
+    {
+      user: {
+        openidId: user.openidId,
+        username: user.username,
+        email: user.email,
+        name: user.name,
+      },
+    },
+  );
+
+  return {
+    ...user,
+    tokenset,
+    federatedTokens: {
+      access_token: tokenset.access_token,
+      id_token: tokenset.id_token,
+      refresh_token: tokenset.refresh_token,
+      expires_at: tokenset.expires_at,
+    },
+  };
+}
+
+/**
+ * @param {boolean | undefined} [existingUsersOnly]
+ */
+function createOpenIDCallback(existingUsersOnly) {
+  return async (tokenset, done) => {
+    try {
+      const user = await processOpenIDAuth(tokenset, existingUsersOnly);
+      done(null, user);
+    } catch (err) {
+      if (err.message === 'Email domain not allowed') {
+        return done(null, false, { message: err.message });
+      }
+      if (err.message === ErrorTypes.AUTH_FAILED) {
+        return done(null, false, { message: err.message });
+      }
+      if (err.message && err.message.includes('role to log in')) {
+        return done(null, false, { message: err.message });
+      }
+      logger.error('[openidStrategy] login failed', err);
+      done(err);
+    }
+  };
+}
+
+/**
+ * Sets up the OpenID strategy specifically for admin authentication.
+ * @param {Configuration} openidConfig
+ */
+const setupOpenIdAdmin = (openidConfig) => {
+  try {
+    if (!openidConfig) {
+      throw new Error('OpenID configuration not initialized');
+    }
+
+    const openidAdminLogin = new CustomOpenIDStrategy(
+      {
+        config: openidConfig,
+        scope: process.env.OPENID_SCOPE,
+        usePKCE: isEnabled(process.env.OPENID_USE_PKCE),
+        clockTolerance: process.env.OPENID_CLOCK_TOLERANCE || 300,
+        callbackURL: process.env.DOMAIN_SERVER + '/api/admin/oauth/openid/callback',
+      },
+      createOpenIDCallback(true),
+    );
+
+    passport.use('openidAdmin', openidAdminLogin);
+  } catch (err) {
+    logger.error('[openidStrategy] setupOpenIdAdmin', err);
+  }
+};
+
 /**
  * Sets up the OpenID strategy for authentication.
  * This function configures the OpenID client, handles proxy settings,
@@ -324,10 +685,6 @@ async function setupOpenId() {
       },
     );
 
-    const requiredRole = process.env.OPENID_REQUIRED_ROLE;
-    const requiredRoleParameterPath = process.env.OPENID_REQUIRED_ROLE_PARAMETER_PATH;
-    const requiredRoleTokenKind = process.env.OPENID_REQUIRED_ROLE_TOKEN_KIND;
-    const usePKCE = isEnabled(process.env.OPENID_USE_PKCE);
     logger.info(`[openidStrategy] OpenID authentication configuration`, {
       generateNonce: shouldGenerateNonce,
       reason: shouldGenerateNonce
@@ -335,241 +692,25 @@ async function setupOpenId() {
         : 'OPENID_GENERATE_NONCE=false - Standard flow without explicit nonce or metadata',
     });
 
-    // Set of env variables that specify how to set if a user is an admin
-    // If not set, all users will be treated as regular users
-    const adminRole = process.env.OPENID_ADMIN_ROLE;
-    const adminRoleParameterPath = process.env.OPENID_ADMIN_ROLE_PARAMETER_PATH;
-    const adminRoleTokenKind = process.env.OPENID_ADMIN_ROLE_TOKEN_KIND;
-
     const openidLogin = new CustomOpenIDStrategy(
       {
         config: openidConfig,
         scope: process.env.OPENID_SCOPE,
         callbackURL: process.env.DOMAIN_SERVER + process.env.OPENID_CALLBACK_URL,
         clockTolerance: process.env.OPENID_CLOCK_TOLERANCE || 300,
-        usePKCE,
-      },
-      /**
-       * @param {import('openid-client').TokenEndpointResponseHelpers} tokenset
-       * @param {import('passport-jwt').VerifyCallback} done
-       */
-      async (tokenset, done) => {
-        try {
-          const claims = tokenset.claims();
-          const userinfo = {
-            ...claims,
-            ...(await getUserInfo(openidConfig, tokenset.access_token, claims.sub)),
-          };
-
-          const appConfig = await getAppConfig();
-          /** Azure AD sometimes doesn't return email, use preferred_username as fallback */
-          const email = userinfo.email || userinfo.preferred_username || userinfo.upn;
-          if (!isEmailDomainAllowed(email, appConfig?.registration?.allowedDomains)) {
-            logger.error(
-              `[OpenID Strategy] Authentication blocked - email domain not allowed [Email: ${email}]`,
-            );
-            return done(null, false, { message: 'Email domain not allowed' });
-          }
-
-          const result = await findOpenIDUser({
-            findUser,
-            email: email,
-            openidId: claims.sub,
-            idOnTheSource: claims.oid,
-            strategyName: 'openidStrategy',
-          });
-          let user = result.user;
-          const error = result.error;
-
-          if (error) {
-            return done(null, false, {
-              message: ErrorTypes.AUTH_FAILED,
-            });
-          }
-
-          const fullName = getFullName(userinfo);
-
-          if (requiredRole) {
-            const requiredRoles = requiredRole
-              .split(',')
-              .map((role) => role.trim())
-              .filter(Boolean);
-            let decodedToken = '';
-            if (requiredRoleTokenKind === 'access') {
-              decodedToken = jwtDecode(tokenset.access_token);
-            } else if (requiredRoleTokenKind === 'id') {
-              decodedToken = jwtDecode(tokenset.id_token);
-            }
-
-            let roles = get(decodedToken, requiredRoleParameterPath);
-            if (!roles || (!Array.isArray(roles) && typeof roles !== 'string')) {
-              logger.error(
-                `[openidStrategy] Key '${requiredRoleParameterPath}' not found or invalid type in ${requiredRoleTokenKind} token!`,
-              );
-              const rolesList =
-                requiredRoles.length === 1
-                  ? `"${requiredRoles[0]}"`
-                  : `one of: ${requiredRoles.map((r) => `"${r}"`).join(', ')}`;
-              return done(null, false, {
-                message: `You must have ${rolesList} role to log in.`,
-              });
-            }
-
-            if (!requiredRoles.some((role) => roles.includes(role))) {
-              const rolesList =
-                requiredRoles.length === 1
-                  ? `"${requiredRoles[0]}"`
-                  : `one of: ${requiredRoles.map((r) => `"${r}"`).join(', ')}`;
-              return done(null, false, {
-                message: `You must have ${rolesList} role to log in.`,
-              });
-            }
-          }
-
-          let username = '';
-          if (process.env.OPENID_USERNAME_CLAIM) {
-            username = userinfo[process.env.OPENID_USERNAME_CLAIM];
-          } else {
-            username = convertToUsername(
-              userinfo.preferred_username || userinfo.username || userinfo.email,
-            );
-          }
-
-          if (!user) {
-            user = {
-              provider: 'openid',
-              openidId: userinfo.sub,
-              username,
-              email: email || '',
-              emailVerified: userinfo.email_verified || false,
-              name: fullName,
-              idOnTheSource: userinfo.oid,
-            };
-
-            const balanceConfig = getBalanceConfig(appConfig);
-            user = await createUser(user, balanceConfig, true, true);
-          } else {
-            user.provider = 'openid';
-            user.openidId = userinfo.sub;
-            user.username = username;
-            user.name = fullName;
-            user.idOnTheSource = userinfo.oid;
-            if (email && email !== user.email) {
-              user.email = email;
-              user.emailVerified = userinfo.email_verified || false;
-            }
-          }
-
-          if (adminRole && adminRoleParameterPath && adminRoleTokenKind) {
-            let adminRoleObject;
-            switch (adminRoleTokenKind) {
-              case 'access':
-                adminRoleObject = jwtDecode(tokenset.access_token);
-                break;
-              case 'id':
-                adminRoleObject = jwtDecode(tokenset.id_token);
-                break;
-              case 'userinfo':
-                adminRoleObject = userinfo;
-                break;
-              default:
-                logger.error(
-                  `[openidStrategy] Invalid admin role token kind: ${adminRoleTokenKind}. Must be one of 'access', 'id', or 'userinfo'.`,
-                );
-                return done(new Error('Invalid admin role token kind'));
-            }
-
-            const adminRoles = get(adminRoleObject, adminRoleParameterPath);
-
-            // Accept 3 types of values for the object extracted from adminRoleParameterPath:
-            // 1. A boolean value indicating if the user is an admin
-            // 2. A string with a single role name
-            // 3. An array of role names
-
-            if (
-              adminRoles &&
-              (adminRoles === true ||
-                adminRoles === adminRole ||
-                (Array.isArray(adminRoles) && adminRoles.includes(adminRole)))
-            ) {
-              user.role = 'ADMIN';
-              logger.info(
-                `[openidStrategy] User ${username} is an admin based on role: ${adminRole}`,
-              );
-            } else if (user.role === 'ADMIN') {
-              user.role = 'USER';
-              logger.info(
-                `[openidStrategy] User ${username} demoted from admin - role no longer present in token`,
-              );
-            }
-          }
-
-          if (!!userinfo && userinfo.picture && !user.avatar?.includes('manual=true')) {
-            /** @type {string | undefined} */
-            const imageUrl = userinfo.picture;
-
-            let fileName;
-            if (crypto) {
-              fileName = (await hashToken(userinfo.sub)) + '.png';
-            } else {
-              fileName = userinfo.sub + '.png';
-            }
-
-            const imageBuffer = await downloadImage(
-              imageUrl,
-              openidConfig,
-              tokenset.access_token,
-              userinfo.sub,
-            );
-            if (imageBuffer) {
-              const { saveBuffer } = getStrategyFunctions(
-                appConfig?.fileStrategy ?? process.env.CDN_PROVIDER,
-              );
-              const imagePath = await saveBuffer({
-                fileName,
-                userId: user._id.toString(),
-                buffer: imageBuffer,
-              });
-              user.avatar = imagePath ?? '';
-            }
-          }
-
-          user = await updateUser(user._id, user);
-
-          logger.info(
-            `[openidStrategy] login success openidId: ${user.openidId} | email: ${user.email} | username: ${user.username} `,
-            {
-              user: {
-                openidId: user.openidId,
-                username: user.username,
-                email: user.email,
-                name: user.name,
-              },
-            },
-          );
-
-          done(null, {
-            ...user,
-            tokenset,
-            federatedTokens: {
-              access_token: tokenset.access_token,
-              refresh_token: tokenset.refresh_token,
-              expires_at: tokenset.expires_at,
-            },
-          });
-        } catch (err) {
-          logger.error('[openidStrategy] login failed', err);
-          done(err);
-        }
+        usePKCE: isEnabled(process.env.OPENID_USE_PKCE),
       },
+      createOpenIDCallback(),
     );
     passport.use('openid', openidLogin);
+    setupOpenIdAdmin(openidConfig);
     return openidConfig;
   } catch (err) {
     logger.error('[openidStrategy]', err);
     return null;
   }
 }
+
 /**
  * @function getOpenIdConfig
  * @description Returns the OpenID client instance.
diff --git a/api/strategies/openidStrategy.spec.js b/api/strategies/openidStrategy.spec.js
index 9ac22ff42f..b1dc54d77b 100644
--- a/api/strategies/openidStrategy.spec.js
+++ b/api/strategies/openidStrategy.spec.js
@@ -1,5 +1,6 @@
 const fetch = require('node-fetch');
 const jwtDecode = require('jsonwebtoken/decode');
+const undici = require('undici');
 const { ErrorTypes } = require('librechat-data-provider');
 const { findUser, createUser, updateUser } = require('~/models');
 const { setupOpenId } = require('./openidStrategy');
@@ -7,6 +8,10 @@ const { setupOpenId } = require('./openidStrategy');
 // --- Mocks ---
 jest.mock('node-fetch');
 jest.mock('jsonwebtoken/decode');
+jest.mock('undici', () => ({
+  fetch: jest.fn(),
+  ProxyAgent: jest.fn(),
+}));
 jest.mock('~/server/services/Files/strategies', () => ({
   getStrategyFunctions: jest.fn(() => ({
     saveBuffer: jest.fn().mockResolvedValue('/fake/path/to/avatar.png'),
@@ -64,21 +69,36 @@ jest.mock('openid-client', () => {
 });
 
 jest.mock('openid-client/passport', () => {
-  let verifyCallback;
+  /** Store callbacks by strategy name - 'openid' and 'openidAdmin' */
+  const verifyCallbacks = {};
+  let lastVerifyCallback;
+
   const mockStrategy = jest.fn((options, verify) => {
-    verifyCallback = verify;
+    lastVerifyCallback = verify;
     return { name: 'openid', options, verify };
   });
 
   return {
     Strategy: mockStrategy,
-    __getVerifyCallback: () => verifyCallback,
+    /** Get the last registered callback (for backward compatibility) */
+    __getVerifyCallback: () => lastVerifyCallback,
+    /** Store callback by name when passport.use is called */
+    __setVerifyCallback: (name, callback) => {
+      verifyCallbacks[name] = callback;
+    },
+    /** Get callback by strategy name */
+    __getVerifyCallbackByName: (name) => verifyCallbacks[name],
   };
 });
 
-// Mock passport
+// Mock passport - capture strategy name and callback
 jest.mock('passport', () => ({
-  use: jest.fn(),
+  use: jest.fn((name, strategy) => {
+    const passportMock = require('openid-client/passport');
+    if (strategy && strategy.verify) {
+      passportMock.__setVerifyCallback(name, strategy.verify);
+    }
+  }),
 }));
 
 describe('setupOpenId', () => {
@@ -159,9 +179,10 @@ describe('setupOpenId', () => {
     };
     fetch.mockResolvedValue(fakeResponse);
 
-    // Call the setup function and capture the verify callback
+    // Call the setup function and capture the verify callback for the regular 'openid' strategy
+    // (not 'openidAdmin' which requires existing users)
     await setupOpenId();
-    verifyCallback = require('openid-client/passport').__getVerifyCallback();
+    verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
   });
 
   it('should create a new user with correct username when preferred_username claim exists', async () => {
@@ -344,6 +365,25 @@ describe('setupOpenId', () => {
     expect(details.message).toBe('You must have "requiredRole" role to log in.');
   });
 
+  it('should not treat substring matches in string roles as satisfying required role', async () => {
+    // Arrange – override required role to "read" then re-setup
+    process.env.OPENID_REQUIRED_ROLE = 'read';
+    await setupOpenId();
+    verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
+
+    // Token contains "bread" which *contains* "read" as a substring
+    jwtDecode.mockReturnValue({
+      roles: 'bread',
+    });
+
+    // Act
+    const { user, details } = await validate(tokenset);
+
+    // Assert – verify that substring match does not grant access
+    expect(user).toBe(false);
+    expect(details.message).toBe('You must have "read" role to log in.');
+  });
+
   it('should allow login when single required role is present (backward compatibility)', async () => {
     // Arrange – ensure single role configuration (as set in beforeEach)
     // OPENID_REQUIRED_ROLE = 'requiredRole'
@@ -362,6 +402,292 @@ describe('setupOpenId', () => {
     expect(createUser).toHaveBeenCalled();
   });
 
+  describe('group overage and groups handling', () => {
+    it.each([
+      ['groups array contains required group', ['group-required', 'other-group'], true, undefined],
+      [
+        'groups array missing required group',
+        ['other-group'],
+        false,
+        'You must have "group-required" role to log in.',
+      ],
+      ['groups string equals required group', 'group-required', true, undefined],
+      [
+        'groups string is other group',
+        'other-group',
+        false,
+        'You must have "group-required" role to log in.',
+      ],
+    ])(
+      'uses groups claim directly when %s (no overage)',
+      async (_label, groupsClaim, expectedAllowed, expectedMessage) => {
+        process.env.OPENID_REQUIRED_ROLE = 'group-required';
+        process.env.OPENID_REQUIRED_ROLE_PARAMETER_PATH = 'groups';
+        process.env.OPENID_REQUIRED_ROLE_TOKEN_KIND = 'id';
+
+        jwtDecode.mockReturnValue({
+          groups: groupsClaim,
+          permissions: ['admin'],
+        });
+
+        await setupOpenId();
+        verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
+
+        const { user, details } = await validate(tokenset);
+
+        expect(undici.fetch).not.toHaveBeenCalled();
+        expect(Boolean(user)).toBe(expectedAllowed);
+        expect(details?.message).toBe(expectedMessage);
+      },
+    );
+
+    it.each([
+      ['token kind is not id', { kind: 'access', path: 'groups', decoded: { hasgroups: true } }],
+      ['parameter path is not groups', { kind: 'id', path: 'roles', decoded: { hasgroups: true } }],
+      ['decoded token is falsy', { kind: 'id', path: 'groups', decoded: null }],
+      [
+        'no overage indicators in decoded token',
+        {
+          kind: 'id',
+          path: 'groups',
+          decoded: {
+            permissions: ['admin'],
+          },
+        },
+      ],
+      [
+        'only _claim_names present (no _claim_sources)',
+        {
+          kind: 'id',
+          path: 'groups',
+          decoded: {
+            _claim_names: { groups: 'src1' },
+            permissions: ['admin'],
+          },
+        },
+      ],
+      [
+        'only _claim_sources present (no _claim_names)',
+        {
+          kind: 'id',
+          path: 'groups',
+          decoded: {
+            _claim_sources: { src1: { endpoint: 'https://graph.windows.net/ignored' } },
+            permissions: ['admin'],
+          },
+        },
+      ],
+    ])('does not attempt overage resolution when %s', async (_label, cfg) => {
+      process.env.OPENID_REQUIRED_ROLE = 'group-required';
+      process.env.OPENID_REQUIRED_ROLE_PARAMETER_PATH = cfg.path;
+      process.env.OPENID_REQUIRED_ROLE_TOKEN_KIND = cfg.kind;
+
+      jwtDecode.mockReturnValue(cfg.decoded);
+
+      await setupOpenId();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
+
+      const { user, details } = await validate(tokenset);
+
+      expect(undici.fetch).not.toHaveBeenCalled();
+      expect(user).toBe(false);
+      expect(details.message).toBe('You must have "group-required" role to log in.');
+      const { logger } = require('@librechat/data-schemas');
+      const expectedTokenKind = cfg.kind === 'access' ? 'access token' : 'id token';
+      expect(logger.error).toHaveBeenCalledWith(
+        expect.stringContaining(`Key '${cfg.path}' not found in ${expectedTokenKind}!`),
+      );
+    });
+  });
+
+  describe('resolving groups via Microsoft Graph', () => {
+    it('denies login and does not call Graph when access token is missing', async () => {
+      process.env.OPENID_REQUIRED_ROLE = 'group-required';
+      process.env.OPENID_REQUIRED_ROLE_PARAMETER_PATH = 'groups';
+      process.env.OPENID_REQUIRED_ROLE_TOKEN_KIND = 'id';
+
+      const { logger } = require('@librechat/data-schemas');
+
+      jwtDecode.mockReturnValue({
+        hasgroups: true,
+        permissions: ['admin'],
+      });
+
+      await setupOpenId();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
+
+      const tokensetWithoutAccess = {
+        ...tokenset,
+        access_token: undefined,
+      };
+
+      const { user, details } = await validate(tokensetWithoutAccess);
+
+      expect(user).toBe(false);
+      expect(details.message).toBe('You must have "group-required" role to log in.');
+
+      expect(undici.fetch).not.toHaveBeenCalled();
+      expect(logger.error).toHaveBeenCalledWith(
+        expect.stringContaining('Access token missing; cannot resolve group overage'),
+      );
+    });
+
+    it.each([
+      [
+        'Graph returns HTTP error',
+        async () => ({
+          ok: false,
+          status: 403,
+          statusText: 'Forbidden',
+          json: async () => ({}),
+        }),
+        [
+          '[openidStrategy] Failed to resolve groups via Microsoft Graph getMemberObjects: HTTP 403 Forbidden',
+        ],
+      ],
+      [
+        'Graph network error',
+        async () => {
+          throw new Error('network error');
+        },
+        [
+          '[openidStrategy] Error resolving groups via Microsoft Graph getMemberObjects:',
+          expect.any(Error),
+        ],
+      ],
+      [
+        'Graph returns unexpected shape (no value)',
+        async () => ({
+          ok: true,
+          status: 200,
+          statusText: 'OK',
+          json: async () => ({}),
+        }),
+        [
+          '[openidStrategy] Unexpected response format when resolving groups via Microsoft Graph getMemberObjects',
+        ],
+      ],
+      [
+        'Graph returns invalid value type',
+        async () => ({
+          ok: true,
+          status: 200,
+          statusText: 'OK',
+          json: async () => ({ value: 'not-an-array' }),
+        }),
+        [
+          '[openidStrategy] Unexpected response format when resolving groups via Microsoft Graph getMemberObjects',
+        ],
+      ],
+    ])(
+      'denies login when overage resolution fails because %s',
+      async (_label, setupFetch, expectedErrorArgs) => {
+        process.env.OPENID_REQUIRED_ROLE = 'group-required';
+        process.env.OPENID_REQUIRED_ROLE_PARAMETER_PATH = 'groups';
+        process.env.OPENID_REQUIRED_ROLE_TOKEN_KIND = 'id';
+
+        const { logger } = require('@librechat/data-schemas');
+
+        jwtDecode.mockReturnValue({
+          hasgroups: true,
+          permissions: ['admin'],
+        });
+
+        await setupOpenId();
+        verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
+
+        undici.fetch.mockImplementation(setupFetch);
+
+        const { user, details } = await validate(tokenset);
+
+        expect(undici.fetch).toHaveBeenCalled();
+        expect(user).toBe(false);
+        expect(details.message).toBe('You must have "group-required" role to log in.');
+
+        expect(logger.error).toHaveBeenCalledWith(...expectedErrorArgs);
+      },
+    );
+
+    it.each([
+      [
+        'hasgroups overage and Graph contains required group',
+        {
+          hasgroups: true,
+        },
+        ['group-required', 'some-other-group'],
+        true,
+      ],
+      [
+        '_claim_* overage and Graph contains required group',
+        {
+          _claim_names: { groups: 'src1' },
+          _claim_sources: { src1: { endpoint: 'https://graph.windows.net/ignored' } },
+        },
+        ['group-required', 'some-other-group'],
+        true,
+      ],
+      [
+        'hasgroups overage and Graph does NOT contain required group',
+        {
+          hasgroups: true,
+        },
+        ['some-other-group'],
+        false,
+      ],
+      [
+        '_claim_* overage and Graph does NOT contain required group',
+        {
+          _claim_names: { groups: 'src1' },
+          _claim_sources: { src1: { endpoint: 'https://graph.windows.net/ignored' } },
+        },
+        ['some-other-group'],
+        false,
+      ],
+    ])(
+      'resolves groups via Microsoft Graph when %s',
+      async (_label, decodedTokenValue, graphGroups, expectedAllowed) => {
+        process.env.OPENID_REQUIRED_ROLE = 'group-required';
+        process.env.OPENID_REQUIRED_ROLE_PARAMETER_PATH = 'groups';
+        process.env.OPENID_REQUIRED_ROLE_TOKEN_KIND = 'id';
+
+        const { logger } = require('@librechat/data-schemas');
+
+        jwtDecode.mockReturnValue(decodedTokenValue);
+
+        await setupOpenId();
+        verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
+
+        undici.fetch.mockResolvedValue({
+          ok: true,
+          status: 200,
+          statusText: 'OK',
+          json: async () => ({
+            value: graphGroups,
+          }),
+        });
+
+        const { user } = await validate(tokenset);
+
+        expect(undici.fetch).toHaveBeenCalledWith(
+          'https://graph.microsoft.com/v1.0/me/getMemberObjects',
+          expect.objectContaining({
+            method: 'POST',
+            headers: expect.objectContaining({
+              Authorization: `Bearer ${tokenset.access_token}`,
+            }),
+          }),
+        );
+        expect(Boolean(user)).toBe(expectedAllowed);
+
+        expect(logger.debug).toHaveBeenCalledWith(
+          expect.stringContaining(
+            `Successfully resolved ${graphGroups.length} groups via Microsoft Graph getMemberObjects`,
+          ),
+        );
+      },
+    );
+  });
+
   it('should attempt to download and save the avatar if picture is provided', async () => {
     // Act
     const { user } = await validate(tokenset);
@@ -389,7 +715,7 @@ describe('setupOpenId', () => {
     // Arrange
     process.env.OPENID_REQUIRED_ROLE = 'someRole,anotherRole,admin';
     await setupOpenId(); // Re-initialize the strategy
-    verifyCallback = require('openid-client/passport').__getVerifyCallback();
+    verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
     jwtDecode.mockReturnValue({
       roles: ['anotherRole', 'aThirdRole'],
     });
@@ -406,7 +732,7 @@ describe('setupOpenId', () => {
     // Arrange
     process.env.OPENID_REQUIRED_ROLE = 'someRole,anotherRole,admin';
     await setupOpenId(); // Re-initialize the strategy
-    verifyCallback = require('openid-client/passport').__getVerifyCallback();
+    verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
     jwtDecode.mockReturnValue({
       roles: ['aThirdRole', 'aFourthRole'],
     });
@@ -425,7 +751,7 @@ describe('setupOpenId', () => {
     // Arrange
     process.env.OPENID_REQUIRED_ROLE = ' someRole , anotherRole , admin ';
     await setupOpenId(); // Re-initialize the strategy
-    verifyCallback = require('openid-client/passport').__getVerifyCallback();
+    verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
     jwtDecode.mockReturnValue({
       roles: ['someRole'],
     });
@@ -449,10 +775,11 @@ describe('setupOpenId', () => {
   });
 
   it('should attach federatedTokens to user object for token propagation', async () => {
-    // Arrange - setup tokenset with access token, refresh token, and expiration
+    // Arrange - setup tokenset with access token, id token, refresh token, and expiration
     const tokensetWithTokens = {
       ...tokenset,
       access_token: 'mock_access_token_abc123',
+      id_token: 'mock_id_token_def456',
       refresh_token: 'mock_refresh_token_xyz789',
       expires_at: 1234567890,
     };
@@ -464,16 +791,37 @@ describe('setupOpenId', () => {
     expect(user.federatedTokens).toBeDefined();
     expect(user.federatedTokens).toEqual({
       access_token: 'mock_access_token_abc123',
+      id_token: 'mock_id_token_def456',
       refresh_token: 'mock_refresh_token_xyz789',
       expires_at: 1234567890,
     });
   });
 
+  it('should include id_token in federatedTokens distinct from access_token', async () => {
+    // Arrange - use different values for access_token and id_token
+    const tokensetWithTokens = {
+      ...tokenset,
+      access_token: 'the_access_token',
+      id_token: 'the_id_token',
+      refresh_token: 'the_refresh_token',
+      expires_at: 9999999999,
+    };
+
+    // Act
+    const { user } = await validate(tokensetWithTokens);
+
+    // Assert - id_token and access_token must be different values
+    expect(user.federatedTokens.access_token).toBe('the_access_token');
+    expect(user.federatedTokens.id_token).toBe('the_id_token');
+    expect(user.federatedTokens.id_token).not.toBe(user.federatedTokens.access_token);
+  });
+
   it('should include tokenset along with federatedTokens', async () => {
     // Arrange
     const tokensetWithTokens = {
       ...tokenset,
       access_token: 'test_access_token',
+      id_token: 'test_id_token',
       refresh_token: 'test_refresh_token',
       expires_at: 9999999999,
     };
@@ -485,7 +833,9 @@ describe('setupOpenId', () => {
     expect(user.tokenset).toBeDefined();
     expect(user.federatedTokens).toBeDefined();
     expect(user.tokenset.access_token).toBe('test_access_token');
+    expect(user.tokenset.id_token).toBe('test_id_token');
     expect(user.federatedTokens.access_token).toBe('test_access_token');
+    expect(user.federatedTokens.id_token).toBe('test_id_token');
   });
 
   it('should set role to "ADMIN" if OPENID_ADMIN_ROLE is set and user has that role', async () => {
@@ -560,7 +910,7 @@ describe('setupOpenId', () => {
     delete process.env.OPENID_ADMIN_ROLE_TOKEN_KIND;
 
     await setupOpenId();
-    verifyCallback = require('openid-client/passport').__getVerifyCallback();
+    verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
     // Simulate an existing admin user
     const existingAdminUser = {
@@ -611,7 +961,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -634,7 +984,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -655,14 +1005,12 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user, details } = await validate(tokenset);
 
       expect(logger.error).toHaveBeenCalledWith(
-        expect.stringContaining(
-          "Key 'resource_access.nonexistent.roles' not found or invalid type in id token!",
-        ),
+        expect.stringContaining("Key 'resource_access.nonexistent.roles' not found in id token!"),
       );
       expect(user).toBe(false);
       expect(details.message).toContain('role to log in');
@@ -680,12 +1028,12 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
       expect(logger.error).toHaveBeenCalledWith(
-        expect.stringContaining("Key 'org.team.roles' not found or invalid type in id token!"),
+        expect.stringContaining("Key 'org.team.roles' not found in id token!"),
       );
       expect(user).toBe(false);
     });
@@ -709,7 +1057,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -739,7 +1087,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate({
         ...tokenset,
@@ -759,7 +1107,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -776,7 +1124,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -793,7 +1141,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -810,7 +1158,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -827,7 +1175,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -847,7 +1195,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
@@ -864,12 +1212,12 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
       expect(logger.error).toHaveBeenCalledWith(
-        expect.stringContaining("Key 'access.roles' not found or invalid type in id token!"),
+        expect.stringContaining("Key 'access.roles' not found in id token!"),
       );
       expect(user).toBe(false);
     });
@@ -884,12 +1232,12 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
       expect(logger.error).toHaveBeenCalledWith(
-        expect.stringContaining("Key 'data.roles' not found or invalid type in id token!"),
+        expect.stringContaining("Key 'data.roles' not found in id token!"),
       );
       expect(user).toBe(false);
     });
@@ -906,7 +1254,7 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       await expect(validate(tokenset)).rejects.toThrow('Invalid admin role token kind');
 
@@ -927,12 +1275,12 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user, details } = await validate(tokenset);
 
       expect(logger.error).toHaveBeenCalledWith(
-        expect.stringContaining("Key 'roles' not found or invalid type in id token!"),
+        expect.stringContaining("Key 'roles' not found in id token!"),
       );
       expect(user).toBe(false);
       expect(details.message).toContain('role to log in');
@@ -948,12 +1296,12 @@ describe('setupOpenId', () => {
       });
 
       await setupOpenId();
-      verifyCallback = require('openid-client/passport').__getVerifyCallback();
+      verifyCallback = require('openid-client/passport').__getVerifyCallbackByName('openid');
 
       const { user } = await validate(tokenset);
 
       expect(logger.error).toHaveBeenCalledWith(
-        expect.stringContaining("Key 'roleCount' not found or invalid type in id token!"),
+        expect.stringContaining("Key 'roleCount' not found in id token!"),
       );
       expect(user).toBe(false);
     });
diff --git a/api/utils/tokens.spec.js b/api/utils/tokens.spec.js
index 3336a0f82d..18905d6d18 100644
--- a/api/utils/tokens.spec.js
+++ b/api/utils/tokens.spec.js
@@ -1,3 +1,4 @@
+/** Note: No hard-coded values should be used in this file. */
 const { EModelEndpoint } = require('librechat-data-provider');
 const {
   maxTokensMap,
@@ -626,41 +627,45 @@ describe('matchModelName', () => {
 describe('Meta Models Tests', () => {
   describe('getModelMaxTokens', () => {
     test('should return correct tokens for LLaMa 2 models', () => {
-      expect(getModelMaxTokens('llama2')).toBe(4000);
-      expect(getModelMaxTokens('llama2.70b')).toBe(4000);
-      expect(getModelMaxTokens('llama2-13b')).toBe(4000);
-      expect(getModelMaxTokens('llama2-70b')).toBe(4000);
+      const llama2Tokens = maxTokensMap[EModelEndpoint.openAI]['llama2'];
+      expect(getModelMaxTokens('llama2')).toBe(llama2Tokens);
+      expect(getModelMaxTokens('llama2.70b')).toBe(llama2Tokens);
+      expect(getModelMaxTokens('llama2-13b')).toBe(llama2Tokens);
+      expect(getModelMaxTokens('llama2-70b')).toBe(llama2Tokens);
     });
 
     test('should return correct tokens for LLaMa 3 models', () => {
-      expect(getModelMaxTokens('llama3')).toBe(8000);
-      expect(getModelMaxTokens('llama3.8b')).toBe(8000);
-      expect(getModelMaxTokens('llama3.70b')).toBe(8000);
-      expect(getModelMaxTokens('llama3-8b')).toBe(8000);
-      expect(getModelMaxTokens('llama3-70b')).toBe(8000);
+      const llama3Tokens = maxTokensMap[EModelEndpoint.openAI]['llama3'];
+      expect(getModelMaxTokens('llama3')).toBe(llama3Tokens);
+      expect(getModelMaxTokens('llama3.8b')).toBe(llama3Tokens);
+      expect(getModelMaxTokens('llama3.70b')).toBe(llama3Tokens);
+      expect(getModelMaxTokens('llama3-8b')).toBe(llama3Tokens);
+      expect(getModelMaxTokens('llama3-70b')).toBe(llama3Tokens);
     });
 
     test('should return correct tokens for LLaMa 3.1 models', () => {
-      expect(getModelMaxTokens('llama3.1:8b')).toBe(127500);
-      expect(getModelMaxTokens('llama3.1:70b')).toBe(127500);
-      expect(getModelMaxTokens('llama3.1:405b')).toBe(127500);
-      expect(getModelMaxTokens('llama3-1-8b')).toBe(127500);
-      expect(getModelMaxTokens('llama3-1-70b')).toBe(127500);
-      expect(getModelMaxTokens('llama3-1-405b')).toBe(127500);
+      const llama31Tokens = maxTokensMap[EModelEndpoint.openAI]['llama3.1:8b'];
+      expect(getModelMaxTokens('llama3.1:8b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('llama3.1:70b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('llama3.1:405b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('llama3-1-8b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('llama3-1-70b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('llama3-1-405b')).toBe(llama31Tokens);
     });
 
     test('should handle partial matches for Meta models', () => {
-      // Test with full model names
-      expect(getModelMaxTokens('meta/llama3.1:405b')).toBe(127500);
-      expect(getModelMaxTokens('meta/llama3.1:70b')).toBe(127500);
-      expect(getModelMaxTokens('meta/llama3.1:8b')).toBe(127500);
-      expect(getModelMaxTokens('meta/llama3-1-8b')).toBe(127500);
+      const llama31Tokens = maxTokensMap[EModelEndpoint.openAI]['llama3.1:8b'];
+      const llama3Tokens = maxTokensMap[EModelEndpoint.openAI]['llama3'];
+      const llama2Tokens = maxTokensMap[EModelEndpoint.openAI]['llama2'];
+      expect(getModelMaxTokens('meta/llama3.1:405b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('meta/llama3.1:70b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('meta/llama3.1:8b')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('meta/llama3-1-8b')).toBe(llama31Tokens);
 
-      // Test base versions
-      expect(getModelMaxTokens('meta/llama3.1')).toBe(127500);
-      expect(getModelMaxTokens('meta/llama3-1')).toBe(127500);
-      expect(getModelMaxTokens('meta/llama3')).toBe(8000);
-      expect(getModelMaxTokens('meta/llama2')).toBe(4000);
+      expect(getModelMaxTokens('meta/llama3.1')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('meta/llama3-1')).toBe(llama31Tokens);
+      expect(getModelMaxTokens('meta/llama3')).toBe(llama3Tokens);
+      expect(getModelMaxTokens('meta/llama2')).toBe(llama2Tokens);
     });
 
     test('should match Deepseek model variations', () => {
@@ -678,18 +683,33 @@ describe('Meta Models Tests', () => {
       );
     });
 
-    test('should return 128000 context tokens for all DeepSeek models', () => {
-      expect(getModelMaxTokens('deepseek-chat')).toBe(128000);
-      expect(getModelMaxTokens('deepseek-reasoner')).toBe(128000);
-      expect(getModelMaxTokens('deepseek-r1')).toBe(128000);
-      expect(getModelMaxTokens('deepseek-v3')).toBe(128000);
-      expect(getModelMaxTokens('deepseek.r1')).toBe(128000);
+    test('should return correct context tokens for all DeepSeek models', () => {
+      const deepseekChatTokens = maxTokensMap[EModelEndpoint.openAI]['deepseek-chat'];
+      expect(getModelMaxTokens('deepseek-chat')).toBe(deepseekChatTokens);
+      expect(getModelMaxTokens('deepseek-reasoner')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['deepseek-reasoner'],
+      );
+      expect(getModelMaxTokens('deepseek-r1')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['deepseek-r1'],
+      );
+      expect(getModelMaxTokens('deepseek-v3')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['deepseek'],
+      );
+      expect(getModelMaxTokens('deepseek.r1')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['deepseek.r1'],
+      );
     });
 
     test('should handle DeepSeek models with provider prefixes', () => {
-      expect(getModelMaxTokens('deepseek/deepseek-chat')).toBe(128000);
-      expect(getModelMaxTokens('openrouter/deepseek-reasoner')).toBe(128000);
-      expect(getModelMaxTokens('openai/deepseek-v3')).toBe(128000);
+      expect(getModelMaxTokens('deepseek/deepseek-chat')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['deepseek-chat'],
+      );
+      expect(getModelMaxTokens('openrouter/deepseek-reasoner')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['deepseek-reasoner'],
+      );
+      expect(getModelMaxTokens('openai/deepseek-v3')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['deepseek'],
+      );
     });
   });
 
@@ -728,30 +748,38 @@ describe('Meta Models Tests', () => {
     const { getModelMaxOutputTokens } = require('@librechat/api');
 
     test('should return correct max output tokens for deepseek-chat', () => {
-      expect(getModelMaxOutputTokens('deepseek-chat')).toBe(8000);
-      expect(getModelMaxOutputTokens('deepseek-chat', EModelEndpoint.openAI)).toBe(8000);
-      expect(getModelMaxOutputTokens('deepseek-chat', EModelEndpoint.custom)).toBe(8000);
+      const expected = maxOutputTokensMap[EModelEndpoint.openAI]['deepseek-chat'];
+      expect(getModelMaxOutputTokens('deepseek-chat')).toBe(expected);
+      expect(getModelMaxOutputTokens('deepseek-chat', EModelEndpoint.openAI)).toBe(expected);
+      expect(getModelMaxOutputTokens('deepseek-chat', EModelEndpoint.custom)).toBe(expected);
     });
 
     test('should return correct max output tokens for deepseek-reasoner', () => {
-      expect(getModelMaxOutputTokens('deepseek-reasoner')).toBe(64000);
-      expect(getModelMaxOutputTokens('deepseek-reasoner', EModelEndpoint.openAI)).toBe(64000);
-      expect(getModelMaxOutputTokens('deepseek-reasoner', EModelEndpoint.custom)).toBe(64000);
+      const expected = maxOutputTokensMap[EModelEndpoint.openAI]['deepseek-reasoner'];
+      expect(getModelMaxOutputTokens('deepseek-reasoner')).toBe(expected);
+      expect(getModelMaxOutputTokens('deepseek-reasoner', EModelEndpoint.openAI)).toBe(expected);
+      expect(getModelMaxOutputTokens('deepseek-reasoner', EModelEndpoint.custom)).toBe(expected);
     });
 
     test('should return correct max output tokens for deepseek-r1', () => {
-      expect(getModelMaxOutputTokens('deepseek-r1')).toBe(64000);
-      expect(getModelMaxOutputTokens('deepseek-r1', EModelEndpoint.openAI)).toBe(64000);
+      const expected = maxOutputTokensMap[EModelEndpoint.openAI]['deepseek-r1'];
+      expect(getModelMaxOutputTokens('deepseek-r1')).toBe(expected);
+      expect(getModelMaxOutputTokens('deepseek-r1', EModelEndpoint.openAI)).toBe(expected);
     });
 
     test('should return correct max output tokens for deepseek base pattern', () => {
-      expect(getModelMaxOutputTokens('deepseek')).toBe(8000);
-      expect(getModelMaxOutputTokens('deepseek-v3')).toBe(8000);
+      const expected = maxOutputTokensMap[EModelEndpoint.openAI]['deepseek'];
+      expect(getModelMaxOutputTokens('deepseek')).toBe(expected);
+      expect(getModelMaxOutputTokens('deepseek-v3')).toBe(expected);
     });
 
     test('should handle DeepSeek models with provider prefixes for max output tokens', () => {
-      expect(getModelMaxOutputTokens('deepseek/deepseek-chat')).toBe(8000);
-      expect(getModelMaxOutputTokens('openrouter/deepseek-reasoner')).toBe(64000);
+      expect(getModelMaxOutputTokens('deepseek/deepseek-chat')).toBe(
+        maxOutputTokensMap[EModelEndpoint.openAI]['deepseek-chat'],
+      );
+      expect(getModelMaxOutputTokens('openrouter/deepseek-reasoner')).toBe(
+        maxOutputTokensMap[EModelEndpoint.openAI]['deepseek-reasoner'],
+      );
     });
   });
 
@@ -796,68 +824,90 @@ describe('Meta Models Tests', () => {
 describe('Grok Model Tests - Tokens', () => {
   describe('getModelMaxTokens', () => {
     test('should return correct tokens for Grok vision models', () => {
-      expect(getModelMaxTokens('grok-2-vision-1212')).toBe(32768);
-      expect(getModelMaxTokens('grok-2-vision')).toBe(32768);
-      expect(getModelMaxTokens('grok-2-vision-latest')).toBe(32768);
+      const grok2VisionTokens = maxTokensMap[EModelEndpoint.openAI]['grok-2-vision'];
+      expect(getModelMaxTokens('grok-2-vision-1212')).toBe(grok2VisionTokens);
+      expect(getModelMaxTokens('grok-2-vision')).toBe(grok2VisionTokens);
+      expect(getModelMaxTokens('grok-2-vision-latest')).toBe(grok2VisionTokens);
     });
 
     test('should return correct tokens for Grok beta models', () => {
-      expect(getModelMaxTokens('grok-vision-beta')).toBe(8192);
-      expect(getModelMaxTokens('grok-beta')).toBe(131072);
+      expect(getModelMaxTokens('grok-vision-beta')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-vision-beta'],
+      );
+      expect(getModelMaxTokens('grok-beta')).toBe(maxTokensMap[EModelEndpoint.openAI]['grok-beta']);
     });
 
     test('should return correct tokens for Grok text models', () => {
-      expect(getModelMaxTokens('grok-2-1212')).toBe(131072);
-      expect(getModelMaxTokens('grok-2')).toBe(131072);
-      expect(getModelMaxTokens('grok-2-latest')).toBe(131072);
+      const grok2Tokens = maxTokensMap[EModelEndpoint.openAI]['grok-2'];
+      expect(getModelMaxTokens('grok-2-1212')).toBe(grok2Tokens);
+      expect(getModelMaxTokens('grok-2')).toBe(grok2Tokens);
+      expect(getModelMaxTokens('grok-2-latest')).toBe(grok2Tokens);
     });
 
     test('should return correct tokens for Grok 3 series models', () => {
-      expect(getModelMaxTokens('grok-3')).toBe(131072);
-      expect(getModelMaxTokens('grok-3-fast')).toBe(131072);
-      expect(getModelMaxTokens('grok-3-mini')).toBe(131072);
-      expect(getModelMaxTokens('grok-3-mini-fast')).toBe(131072);
+      expect(getModelMaxTokens('grok-3')).toBe(maxTokensMap[EModelEndpoint.openAI]['grok-3']);
+      expect(getModelMaxTokens('grok-3-fast')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-3-fast'],
+      );
+      expect(getModelMaxTokens('grok-3-mini')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-3-mini'],
+      );
+      expect(getModelMaxTokens('grok-3-mini-fast')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-3-mini-fast'],
+      );
     });
 
     test('should return correct tokens for Grok 4 model', () => {
-      expect(getModelMaxTokens('grok-4-0709')).toBe(256000);
+      expect(getModelMaxTokens('grok-4-0709')).toBe(maxTokensMap[EModelEndpoint.openAI]['grok-4']);
     });
 
     test('should return correct tokens for Grok 4 Fast and Grok 4.1 Fast models', () => {
-      expect(getModelMaxTokens('grok-4-fast')).toBe(2000000);
-      expect(getModelMaxTokens('grok-4-1-fast-reasoning')).toBe(2000000);
-      expect(getModelMaxTokens('grok-4-1-fast-non-reasoning')).toBe(2000000);
+      const grok4FastTokens = maxTokensMap[EModelEndpoint.openAI]['grok-4-fast'];
+      const grok41FastTokens = maxTokensMap[EModelEndpoint.openAI]['grok-4-1-fast'];
+      expect(getModelMaxTokens('grok-4-fast')).toBe(grok4FastTokens);
+      expect(getModelMaxTokens('grok-4-1-fast-reasoning')).toBe(grok41FastTokens);
+      expect(getModelMaxTokens('grok-4-1-fast-non-reasoning')).toBe(grok41FastTokens);
     });
 
     test('should return correct tokens for Grok Code Fast model', () => {
-      expect(getModelMaxTokens('grok-code-fast-1')).toBe(256000);
+      expect(getModelMaxTokens('grok-code-fast-1')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-code-fast'],
+      );
     });
 
     test('should handle partial matches for Grok models with prefixes', () => {
-      // Vision models should match before general models
-      expect(getModelMaxTokens('xai/grok-2-vision-1212')).toBe(32768);
-      expect(getModelMaxTokens('xai/grok-2-vision')).toBe(32768);
-      expect(getModelMaxTokens('xai/grok-2-vision-latest')).toBe(32768);
-      // Beta models
-      expect(getModelMaxTokens('xai/grok-vision-beta')).toBe(8192);
-      expect(getModelMaxTokens('xai/grok-beta')).toBe(131072);
-      // Text models
-      expect(getModelMaxTokens('xai/grok-2-1212')).toBe(131072);
-      expect(getModelMaxTokens('xai/grok-2')).toBe(131072);
-      expect(getModelMaxTokens('xai/grok-2-latest')).toBe(131072);
-      // Grok 3 models
-      expect(getModelMaxTokens('xai/grok-3')).toBe(131072);
-      expect(getModelMaxTokens('xai/grok-3-fast')).toBe(131072);
-      expect(getModelMaxTokens('xai/grok-3-mini')).toBe(131072);
-      expect(getModelMaxTokens('xai/grok-3-mini-fast')).toBe(131072);
-      // Grok 4 model
-      expect(getModelMaxTokens('xai/grok-4-0709')).toBe(256000);
-      // Grok 4 Fast and 4.1 Fast models
-      expect(getModelMaxTokens('xai/grok-4-fast')).toBe(2000000);
-      expect(getModelMaxTokens('xai/grok-4-1-fast-reasoning')).toBe(2000000);
-      expect(getModelMaxTokens('xai/grok-4-1-fast-non-reasoning')).toBe(2000000);
-      // Grok Code Fast model
-      expect(getModelMaxTokens('xai/grok-code-fast-1')).toBe(256000);
+      const grok2VisionTokens = maxTokensMap[EModelEndpoint.openAI]['grok-2-vision'];
+      const grokVisionBetaTokens = maxTokensMap[EModelEndpoint.openAI]['grok-vision-beta'];
+      const grokBetaTokens = maxTokensMap[EModelEndpoint.openAI]['grok-beta'];
+      const grok2Tokens = maxTokensMap[EModelEndpoint.openAI]['grok-2'];
+      const grok3Tokens = maxTokensMap[EModelEndpoint.openAI]['grok-3'];
+      const grok4Tokens = maxTokensMap[EModelEndpoint.openAI]['grok-4'];
+      const grok4FastTokens = maxTokensMap[EModelEndpoint.openAI]['grok-4-fast'];
+      const grok41FastTokens = maxTokensMap[EModelEndpoint.openAI]['grok-4-1-fast'];
+      const grokCodeFastTokens = maxTokensMap[EModelEndpoint.openAI]['grok-code-fast'];
+      expect(getModelMaxTokens('xai/grok-2-vision-1212')).toBe(grok2VisionTokens);
+      expect(getModelMaxTokens('xai/grok-2-vision')).toBe(grok2VisionTokens);
+      expect(getModelMaxTokens('xai/grok-2-vision-latest')).toBe(grok2VisionTokens);
+      expect(getModelMaxTokens('xai/grok-vision-beta')).toBe(grokVisionBetaTokens);
+      expect(getModelMaxTokens('xai/grok-beta')).toBe(grokBetaTokens);
+      expect(getModelMaxTokens('xai/grok-2-1212')).toBe(grok2Tokens);
+      expect(getModelMaxTokens('xai/grok-2')).toBe(grok2Tokens);
+      expect(getModelMaxTokens('xai/grok-2-latest')).toBe(grok2Tokens);
+      expect(getModelMaxTokens('xai/grok-3')).toBe(grok3Tokens);
+      expect(getModelMaxTokens('xai/grok-3-fast')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-3-fast'],
+      );
+      expect(getModelMaxTokens('xai/grok-3-mini')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-3-mini'],
+      );
+      expect(getModelMaxTokens('xai/grok-3-mini-fast')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['grok-3-mini-fast'],
+      );
+      expect(getModelMaxTokens('xai/grok-4-0709')).toBe(grok4Tokens);
+      expect(getModelMaxTokens('xai/grok-4-fast')).toBe(grok4FastTokens);
+      expect(getModelMaxTokens('xai/grok-4-1-fast-reasoning')).toBe(grok41FastTokens);
+      expect(getModelMaxTokens('xai/grok-4-1-fast-non-reasoning')).toBe(grok41FastTokens);
+      expect(getModelMaxTokens('xai/grok-code-fast-1')).toBe(grokCodeFastTokens);
     });
   });
 
@@ -1062,46 +1112,251 @@ describe('Claude Model Tests', () => {
       expect(matchModelName(model, EModelEndpoint.anthropic)).toBe(expectedModel);
     });
   });
+
+  it('should return correct context length for Claude Opus 4.6 (1M)', () => {
+    expect(getModelMaxTokens('claude-opus-4-6', EModelEndpoint.anthropic)).toBe(
+      maxTokensMap[EModelEndpoint.anthropic]['claude-opus-4-6'],
+    );
+    expect(getModelMaxTokens('claude-opus-4-6')).toBe(
+      maxTokensMap[EModelEndpoint.anthropic]['claude-opus-4-6'],
+    );
+  });
+
+  it('should return correct max output tokens for Claude Opus 4.6 (128K)', () => {
+    const { getModelMaxOutputTokens } = require('@librechat/api');
+    expect(getModelMaxOutputTokens('claude-opus-4-6', EModelEndpoint.anthropic)).toBe(
+      maxOutputTokensMap[EModelEndpoint.anthropic]['claude-opus-4-6'],
+    );
+  });
+
+  it('should handle Claude Opus 4.6 model name variations', () => {
+    const modelVariations = [
+      'claude-opus-4-6',
+      'claude-opus-4-6-20250801',
+      'claude-opus-4-6-latest',
+      'anthropic/claude-opus-4-6',
+      'claude-opus-4-6/anthropic',
+      'claude-opus-4-6-preview',
+    ];
+
+    modelVariations.forEach((model) => {
+      const modelKey = findMatchingPattern(model, maxTokensMap[EModelEndpoint.anthropic]);
+      expect(modelKey).toBe('claude-opus-4-6');
+      expect(getModelMaxTokens(model, EModelEndpoint.anthropic)).toBe(
+        maxTokensMap[EModelEndpoint.anthropic]['claude-opus-4-6'],
+      );
+    });
+  });
+
+  it('should match model names correctly for Claude Opus 4.6', () => {
+    const modelVariations = [
+      'claude-opus-4-6',
+      'claude-opus-4-6-20250801',
+      'claude-opus-4-6-latest',
+      'anthropic/claude-opus-4-6',
+      'claude-opus-4-6/anthropic',
+      'claude-opus-4-6-preview',
+    ];
+
+    modelVariations.forEach((model) => {
+      expect(matchModelName(model, EModelEndpoint.anthropic)).toBe('claude-opus-4-6');
+    });
+  });
+
+  it('should return correct context length for Claude Sonnet 4.6 (1M)', () => {
+    expect(getModelMaxTokens('claude-sonnet-4-6', EModelEndpoint.anthropic)).toBe(
+      maxTokensMap[EModelEndpoint.anthropic]['claude-sonnet-4-6'],
+    );
+    expect(getModelMaxTokens('claude-sonnet-4-6')).toBe(
+      maxTokensMap[EModelEndpoint.anthropic]['claude-sonnet-4-6'],
+    );
+  });
+
+  it('should return correct max output tokens for Claude Sonnet 4.6 (64K)', () => {
+    const { getModelMaxOutputTokens } = require('@librechat/api');
+    expect(getModelMaxOutputTokens('claude-sonnet-4-6', EModelEndpoint.anthropic)).toBe(
+      maxOutputTokensMap[EModelEndpoint.anthropic]['claude-sonnet-4-6'],
+    );
+  });
+
+  it('should handle Claude Sonnet 4.6 model name variations', () => {
+    const modelVariations = [
+      'claude-sonnet-4-6',
+      'claude-sonnet-4-6-20260101',
+      'claude-sonnet-4-6-latest',
+      'anthropic/claude-sonnet-4-6',
+      'claude-sonnet-4-6/anthropic',
+      'claude-sonnet-4-6-preview',
+    ];
+
+    modelVariations.forEach((model) => {
+      const modelKey = findMatchingPattern(model, maxTokensMap[EModelEndpoint.anthropic]);
+      expect(modelKey).toBe('claude-sonnet-4-6');
+      expect(getModelMaxTokens(model, EModelEndpoint.anthropic)).toBe(
+        maxTokensMap[EModelEndpoint.anthropic]['claude-sonnet-4-6'],
+      );
+    });
+  });
+
+  it('should match model names correctly for Claude Sonnet 4.6', () => {
+    const modelVariations = [
+      'claude-sonnet-4-6',
+      'claude-sonnet-4-6-20260101',
+      'claude-sonnet-4-6-latest',
+      'anthropic/claude-sonnet-4-6',
+      'claude-sonnet-4-6/anthropic',
+      'claude-sonnet-4-6-preview',
+    ];
+
+    modelVariations.forEach((model) => {
+      expect(matchModelName(model, EModelEndpoint.anthropic)).toBe('claude-sonnet-4-6');
+    });
+  });
 });
 
-describe('Kimi Model Tests', () => {
+describe('Moonshot/Kimi Model Tests', () => {
   describe('getModelMaxTokens', () => {
-    test('should return correct tokens for Kimi models', () => {
-      expect(getModelMaxTokens('kimi')).toBe(131000);
-      expect(getModelMaxTokens('kimi-k2')).toBe(131000);
-      expect(getModelMaxTokens('kimi-vl')).toBe(131000);
+    test('should return correct tokens for kimi-k2.5 (multi-modal)', () => {
+      expect(getModelMaxTokens('kimi-k2.5')).toBe(maxTokensMap[EModelEndpoint.openAI]['kimi-k2.5']);
+      expect(getModelMaxTokens('kimi-k2.5-latest')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2.5'],
+      );
     });
 
-    test('should return correct tokens for Kimi models with provider prefix', () => {
-      expect(getModelMaxTokens('moonshotai/kimi-k2')).toBe(131000);
-      expect(getModelMaxTokens('moonshotai/kimi')).toBe(131000);
-      expect(getModelMaxTokens('moonshotai/kimi-vl')).toBe(131000);
+    test('should return correct tokens for kimi-k2 series models', () => {
+      expect(getModelMaxTokens('kimi')).toBe(maxTokensMap[EModelEndpoint.openAI]['kimi']);
+      expect(getModelMaxTokens('kimi-k2')).toBe(maxTokensMap[EModelEndpoint.openAI]['kimi-k2']);
+      expect(getModelMaxTokens('kimi-k2-turbo')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-turbo'],
+      );
+      expect(getModelMaxTokens('kimi-k2-turbo-preview')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-turbo-preview'],
+      );
+      expect(getModelMaxTokens('kimi-k2-0905')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-0905'],
+      );
+      expect(getModelMaxTokens('kimi-k2-0905-preview')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-0905-preview'],
+      );
+      expect(getModelMaxTokens('kimi-k2-thinking')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-thinking'],
+      );
+      expect(getModelMaxTokens('kimi-k2-thinking-turbo')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-thinking-turbo'],
+      );
     });
 
-    test('should handle partial matches for Kimi models', () => {
-      expect(getModelMaxTokens('kimi-k2-latest')).toBe(131000);
-      expect(getModelMaxTokens('kimi-vl-preview')).toBe(131000);
-      expect(getModelMaxTokens('kimi-2024')).toBe(131000);
+    test('should return correct tokens for kimi-k2-0711 (smaller context)', () => {
+      expect(getModelMaxTokens('kimi-k2-0711')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-0711'],
+      );
+      expect(getModelMaxTokens('kimi-k2-0711-preview')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-0711-preview'],
+      );
+    });
+
+    test('should return correct tokens for kimi-latest', () => {
+      expect(getModelMaxTokens('kimi-latest')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-latest'],
+      );
+    });
+
+    test('should return correct tokens for moonshot-v1 series models', () => {
+      expect(getModelMaxTokens('moonshot')).toBe(maxTokensMap[EModelEndpoint.openAI]['moonshot']);
+      expect(getModelMaxTokens('moonshot-v1')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-auto')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-auto'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-8k')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-8k'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-8k-vision')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-8k-vision'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-8k-vision-preview')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-8k-vision-preview'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-32k')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-32k'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-32k-vision')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-32k-vision'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-32k-vision-preview')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-32k-vision-preview'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-128k')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-128k'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-128k-vision')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-128k-vision'],
+      );
+      expect(getModelMaxTokens('moonshot-v1-128k-vision-preview')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-128k-vision-preview'],
+      );
+    });
+
+    test('should return correct tokens for Bedrock moonshot models', () => {
+      expect(getModelMaxTokens('moonshot.kimi', EModelEndpoint.bedrock)).toBe(
+        maxTokensMap[EModelEndpoint.bedrock]['moonshot.kimi'],
+      );
+      expect(getModelMaxTokens('moonshot.kimi-k2', EModelEndpoint.bedrock)).toBe(
+        maxTokensMap[EModelEndpoint.bedrock]['moonshot.kimi-k2'],
+      );
+      expect(getModelMaxTokens('moonshot.kimi-k2.5', EModelEndpoint.bedrock)).toBe(
+        maxTokensMap[EModelEndpoint.bedrock]['moonshot.kimi-k2.5'],
+      );
+      expect(getModelMaxTokens('moonshot.kimi-k2-thinking', EModelEndpoint.bedrock)).toBe(
+        maxTokensMap[EModelEndpoint.bedrock]['moonshot.kimi-k2-thinking'],
+      );
+      expect(getModelMaxTokens('moonshot.kimi-k2-0711', EModelEndpoint.bedrock)).toBe(
+        maxTokensMap[EModelEndpoint.bedrock]['moonshot.kimi-k2-0711'],
+      );
+    });
+
+    test('should handle Moonshot/Kimi models with provider prefixes', () => {
+      expect(getModelMaxTokens('openrouter/kimi-k2')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2'],
+      );
+      expect(getModelMaxTokens('openrouter/kimi-k2.5')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2.5'],
+      );
+      expect(getModelMaxTokens('openrouter/kimi-k2-turbo')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['kimi-k2-turbo'],
+      );
+      expect(getModelMaxTokens('openrouter/moonshot-v1-128k')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['moonshot-v1-128k'],
+      );
     });
   });
 
   describe('matchModelName', () => {
     test('should match exact Kimi model names', () => {
       expect(matchModelName('kimi')).toBe('kimi');
-      expect(matchModelName('kimi-k2')).toBe('kimi');
-      expect(matchModelName('kimi-vl')).toBe('kimi');
+      expect(matchModelName('kimi-k2')).toBe('kimi-k2');
+      expect(matchModelName('kimi-k2.5')).toBe('kimi-k2.5');
+      expect(matchModelName('kimi-k2-turbo')).toBe('kimi-k2-turbo');
+      expect(matchModelName('kimi-k2-0711')).toBe('kimi-k2-0711');
+    });
+
+    test('should match moonshot model names', () => {
+      expect(matchModelName('moonshot')).toBe('moonshot');
+      expect(matchModelName('moonshot-v1-8k')).toBe('moonshot-v1-8k');
+      expect(matchModelName('moonshot-v1-32k')).toBe('moonshot-v1-32k');
+      expect(matchModelName('moonshot-v1-128k')).toBe('moonshot-v1-128k');
     });
 
     test('should match Kimi model variations with provider prefix', () => {
-      expect(matchModelName('moonshotai/kimi')).toBe('kimi');
-      expect(matchModelName('moonshotai/kimi-k2')).toBe('kimi');
-      expect(matchModelName('moonshotai/kimi-vl')).toBe('kimi');
+      expect(matchModelName('openrouter/kimi')).toBe('kimi');
+      expect(matchModelName('openrouter/kimi-k2')).toBe('kimi-k2');
+      expect(matchModelName('openrouter/kimi-k2.5')).toBe('kimi-k2.5');
     });
 
     test('should match Kimi model variations with suffixes', () => {
-      expect(matchModelName('kimi-k2-latest')).toBe('kimi');
-      expect(matchModelName('kimi-vl-preview')).toBe('kimi');
-      expect(matchModelName('kimi-2024')).toBe('kimi');
+      expect(matchModelName('kimi-k2-latest')).toBe('kimi-k2');
+      expect(matchModelName('kimi-k2.5-preview')).toBe('kimi-k2.5');
     });
   });
 });
@@ -1224,44 +1479,80 @@ describe('Qwen3 Model Tests', () => {
 describe('GLM Model Tests (Zhipu AI)', () => {
   describe('getModelMaxTokens', () => {
     test('should return correct tokens for GLM models', () => {
-      expect(getModelMaxTokens('glm-4.6')).toBe(200000);
-      expect(getModelMaxTokens('glm-4.5v')).toBe(66000);
-      expect(getModelMaxTokens('glm-4.5-air')).toBe(131000);
-      expect(getModelMaxTokens('glm-4.5')).toBe(131000);
-      expect(getModelMaxTokens('glm-4-32b')).toBe(128000);
-      expect(getModelMaxTokens('glm-4')).toBe(128000);
-      expect(getModelMaxTokens('glm4')).toBe(128000);
+      expect(getModelMaxTokens('glm-4.6')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4.6']);
+      expect(getModelMaxTokens('glm-4.5v')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4.5v']);
+      expect(getModelMaxTokens('glm-4.5-air')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5-air'],
+      );
+      expect(getModelMaxTokens('glm-4.5')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4.5']);
+      expect(getModelMaxTokens('glm-4-32b')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4-32b']);
+      expect(getModelMaxTokens('glm-4')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4']);
+      expect(getModelMaxTokens('glm4')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm4']);
     });
 
     test('should handle partial matches for GLM models with provider prefixes', () => {
-      expect(getModelMaxTokens('z-ai/glm-4.6')).toBe(200000);
-      expect(getModelMaxTokens('z-ai/glm-4.5')).toBe(131000);
-      expect(getModelMaxTokens('z-ai/glm-4.5-air')).toBe(131000);
-      expect(getModelMaxTokens('z-ai/glm-4.5v')).toBe(66000);
-      expect(getModelMaxTokens('z-ai/glm-4-32b')).toBe(128000);
+      expect(getModelMaxTokens('z-ai/glm-4.6')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.6'],
+      );
+      expect(getModelMaxTokens('z-ai/glm-4.5')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5'],
+      );
+      expect(getModelMaxTokens('z-ai/glm-4.5-air')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5-air'],
+      );
+      expect(getModelMaxTokens('z-ai/glm-4.5v')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5v'],
+      );
+      expect(getModelMaxTokens('z-ai/glm-4-32b')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4-32b'],
+      );
 
-      expect(getModelMaxTokens('zai/glm-4.6')).toBe(200000);
-      expect(getModelMaxTokens('zai/glm-4.5')).toBe(131000);
-      expect(getModelMaxTokens('zai/glm-4.5-air')).toBe(131000);
-      expect(getModelMaxTokens('zai/glm-4.5v')).toBe(66000);
+      expect(getModelMaxTokens('zai/glm-4.6')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4.6']);
+      expect(getModelMaxTokens('zai/glm-4.5')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4.5']);
+      expect(getModelMaxTokens('zai/glm-4.5-air')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5-air'],
+      );
+      expect(getModelMaxTokens('zai/glm-4.5v')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5v'],
+      );
 
-      expect(getModelMaxTokens('zai-org/GLM-4.6')).toBe(200000);
-      expect(getModelMaxTokens('zai-org/GLM-4.5')).toBe(131000);
-      expect(getModelMaxTokens('zai-org/GLM-4.5-Air')).toBe(131000);
-      expect(getModelMaxTokens('zai-org/GLM-4.5V')).toBe(66000);
-      expect(getModelMaxTokens('zai-org/GLM-4-32B-0414')).toBe(128000);
+      expect(getModelMaxTokens('zai-org/GLM-4.6')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.6'],
+      );
+      expect(getModelMaxTokens('zai-org/GLM-4.5')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5'],
+      );
+      expect(getModelMaxTokens('zai-org/GLM-4.5-Air')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5-air'],
+      );
+      expect(getModelMaxTokens('zai-org/GLM-4.5V')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5v'],
+      );
+      expect(getModelMaxTokens('zai-org/GLM-4-32B-0414')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4-32b'],
+      );
     });
 
     test('should handle GLM model variations with suffixes', () => {
-      expect(getModelMaxTokens('glm-4.6-fp8')).toBe(200000);
-      expect(getModelMaxTokens('zai-org/GLM-4.6-FP8')).toBe(200000);
-      expect(getModelMaxTokens('zai-org/GLM-4.5-Air-FP8')).toBe(131000);
+      expect(getModelMaxTokens('glm-4.6-fp8')).toBe(maxTokensMap[EModelEndpoint.openAI]['glm-4.6']);
+      expect(getModelMaxTokens('zai-org/GLM-4.6-FP8')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.6'],
+      );
+      expect(getModelMaxTokens('zai-org/GLM-4.5-Air-FP8')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5-air'],
+      );
     });
 
     test('should prioritize more specific GLM patterns', () => {
-      expect(getModelMaxTokens('glm-4.5-air-custom')).toBe(131000);
-      expect(getModelMaxTokens('glm-4.5-custom')).toBe(131000);
-      expect(getModelMaxTokens('glm-4.5v-custom')).toBe(66000);
+      expect(getModelMaxTokens('glm-4.5-air-custom')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5-air'],
+      );
+      expect(getModelMaxTokens('glm-4.5-custom')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5'],
+      );
+      expect(getModelMaxTokens('glm-4.5v-custom')).toBe(
+        maxTokensMap[EModelEndpoint.openAI]['glm-4.5v'],
+      );
     });
   });
 
diff --git a/bun.lock b/bun.lock
index 783bfc762e..600a640c87 100644
--- a/bun.lock
+++ b/bun.lock
@@ -254,7 +254,7 @@
     },
     "packages/api": {
       "name": "@librechat/api",
-      "version": "1.7.20",
+      "version": "1.7.22",
       "devDependencies": {
         "@babel/preset-env": "^7.21.5",
         "@babel/preset-react": "^7.18.6",
@@ -321,7 +321,7 @@
     },
     "packages/client": {
       "name": "@librechat/client",
-      "version": "0.4.4",
+      "version": "0.4.51",
       "devDependencies": {
         "@babel/core": "^7.28.5",
         "@babel/preset-env": "^7.28.5",
@@ -409,7 +409,7 @@
     },
     "packages/data-provider": {
       "name": "librechat-data-provider",
-      "version": "0.8.220",
+      "version": "0.8.231",
       "dependencies": {
         "axios": "^1.12.1",
         "dayjs": "^1.11.13",
@@ -447,7 +447,7 @@
     },
     "packages/data-schemas": {
       "name": "@librechat/data-schemas",
-      "version": "0.0.33",
+      "version": "0.0.35",
       "devDependencies": {
         "@rollup/plugin-alias": "^5.1.0",
         "@rollup/plugin-commonjs": "^29.0.0",
diff --git a/client/jest.config.cjs b/client/jest.config.cjs
index 9a9f9f5451..53d4063a0a 100644
--- a/client/jest.config.cjs
+++ b/client/jest.config.cjs
@@ -1,4 +1,4 @@
-/** v0.8.2-rc2 */
+/** v0.8.2 */
 module.exports = {
   roots: ['<rootDir>/src'],
   testEnvironment: 'jsdom',
diff --git a/client/package.json b/client/package.json
index 81b2fdf255..f6838f5091 100644
--- a/client/package.json
+++ b/client/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@librechat/frontend",
-  "version": "v0.8.2-rc2",
+  "version": "v0.8.2",
   "description": "",
   "type": "module",
   "scripts": {
@@ -77,10 +77,10 @@
     "jotai": "^2.12.5",
     "js-cookie": "^3.0.5",
     "librechat-data-provider": "*",
-    "lodash": "^4.17.21",
+    "lodash": "^4.17.23",
     "lucide-react": "^0.394.0",
     "match-sorter": "^8.1.0",
-    "mermaid": "^11.12.2",
+    "mermaid": "^11.12.3",
     "micromark-extension-llm-math": "^3.1.0",
     "qrcode.react": "^4.2.0",
     "rc-input-number": "^7.4.2",
@@ -148,7 +148,6 @@
     "jest-file-loader": "^1.0.3",
     "jest-junit": "^16.0.0",
     "postcss": "^8.4.31",
-    "postcss-loader": "^7.1.0",
     "postcss-preset-env": "^8.2.0",
     "tailwindcss": "^3.4.1",
     "typescript": "^5.3.3",
diff --git a/client/public/assets/maskable-icon.png b/client/public/assets/maskable-icon.png
index 90e48f870b..b48524b867 100644
Binary files a/client/public/assets/maskable-icon.png and b/client/public/assets/maskable-icon.png differ
diff --git a/client/public/assets/web-browser.svg b/client/public/assets/web-browser.svg
deleted file mode 100644
index 3f9c85d14b..0000000000
--- a/client/public/assets/web-browser.svg
+++ /dev/null
@@ -1,86 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Created with Inkscape (http://www.inkscape.org/) -->
-
-<svg
-   width="135.46666mm"
-   height="135.46666mm"
-   viewBox="0 0 135.46666 135.46666"
-   version="1.1"
-   id="svg5"
-   xml:space="preserve"
-   inkscape:version="1.2.2 (732a01da63, 2022-12-09)"
-   sodipodi:docname="web-browser.svg"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns:xlink="http://www.w3.org/1999/xlink"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:svg="http://www.w3.org/2000/svg"><sodipodi:namedview
-     id="namedview7"
-     pagecolor="#ffffff"
-     bordercolor="#666666"
-     borderopacity="1.0"
-     inkscape:showpageshadow="2"
-     inkscape:pageopacity="0.0"
-     inkscape:pagecheckerboard="0"
-     inkscape:deskcolor="#d1d1d1"
-     inkscape:document-units="mm"
-     showgrid="false"
-     inkscape:zoom="1.829812"
-     inkscape:cx="339.10587"
-     inkscape:cy="281.44968"
-     inkscape:window-width="2560"
-     inkscape:window-height="1369"
-     inkscape:window-x="1072"
-     inkscape:window-y="-8"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="layer1" /><defs
-     id="defs2"><linearGradient
-       id="linearGradient1021"
-       inkscape:collect="always"><stop
-         style="stop-color:#6914d1;stop-opacity:1;"
-         offset="0"
-         id="stop1017" /><stop
-         style="stop-color:#c82090;stop-opacity:1;"
-         offset="1"
-         id="stop1019" /></linearGradient><linearGradient
-       inkscape:collect="always"
-       xlink:href="#linearGradient1021"
-       id="linearGradient5957"
-       x1="75.754601"
-       y1="163.95738"
-       x2="146.97395"
-       y2="86.082359"
-       gradientUnits="userSpaceOnUse" /></defs><g
-     inkscape:label="Layer 1"
-     inkscape:groupmode="layer"
-     id="layer1"
-     transform="translate(-38.978451,-51.992085)"><g
-       inkscape:groupmode="layer"
-       id="layer2"
-       inkscape:label="Layer 2"
-       transform="translate(38.978451,51.992085)"
-       style="fill:#000000;fill-opacity:1"><rect
-         style="display:inline;fill:#000000;fill-opacity:1;stroke-width:34.9999"
-         id="rect3228"
-         width="135.46666"
-         height="135.46666"
-         x="0"
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diff --git a/client/src/Providers/BadgeRowContext.tsx b/client/src/Providers/BadgeRowContext.tsx
index 40df795aba..dce1c38a78 100644
--- a/client/src/Providers/BadgeRowContext.tsx
+++ b/client/src/Providers/BadgeRowContext.tsx
@@ -1,4 +1,4 @@
-import React, { createContext, useContext, useEffect, useRef } from 'react';
+import React, { createContext, useContext, useEffect, useMemo, useRef } from 'react';
 import { useSetRecoilState } from 'recoil';
 import { Tools, Constants, LocalStorageKeys, AgentCapabilities } from 'librechat-data-provider';
 import type { TAgentsEndpoint } from 'librechat-data-provider';
@@ -9,11 +9,13 @@ import {
   useCodeApiKeyForm,
   useToolToggle,
 } from '~/hooks';
-import { getTimestampedValue, setTimestamp } from '~/utils/timestamps';
+import { getTimestampedValue } from '~/utils/timestamps';
+import { useGetStartupConfig } from '~/data-provider';
 import { ephemeralAgentByConvoId } from '~/store';
 
 interface BadgeRowContextType {
   conversationId?: string | null;
+  storageContextKey?: string;
   agentsConfig?: TAgentsEndpoint | null;
   webSearch: ReturnType<typeof useToolToggle>;
   artifacts: ReturnType<typeof useToolToggle>;
@@ -38,34 +40,70 @@ interface BadgeRowProviderProps {
   children: React.ReactNode;
   isSubmitting?: boolean;
   conversationId?: string | null;
+  specName?: string | null;
 }
 
 export default function BadgeRowProvider({
   children,
   isSubmitting,
   conversationId,
+  specName,
 }: BadgeRowProviderProps) {
-  const lastKeyRef = useRef<string>('');
+  const lastContextKeyRef = useRef<string>('');
   const hasInitializedRef = useRef(false);
   const { agentsConfig } = useGetAgentsConfig();
+  const { data: startupConfig } = useGetStartupConfig();
   const key = conversationId ?? Constants.NEW_CONVO;
+  const hasModelSpecs = (startupConfig?.modelSpecs?.list?.length ?? 0) > 0;
+
+  /**
+   * Compute the storage context key for non-spec persistence:
+   * - `__defaults__`: specs configured but none active → shared defaults key
+   * - undefined: spec active (no persistence) or no specs configured (original behavior)
+   *
+   * When a spec is active, tool/MCP state is NOT persisted — the admin's spec
+   * configuration is always applied fresh. Only non-spec user preferences persist.
+   */
+  const storageContextKey = useMemo(() => {
+    if (!specName && hasModelSpecs) {
+      return Constants.spec_defaults_key as string;
+    }
+    return undefined;
+  }, [specName, hasModelSpecs]);
+
+  /**
+   * Compute the storage suffix for reading localStorage defaults:
+   * - New conversations read from environment key (spec or non-spec defaults)
+   * - Existing conversations read from conversation key (per-conversation state)
+   */
+  const isNewConvo = key === Constants.NEW_CONVO;
+  const storageSuffix = isNewConvo && storageContextKey ? storageContextKey : key;
 
   const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(key));
 
-  /** Initialize ephemeralAgent from localStorage on mount and when conversation changes */
+  /** Initialize ephemeralAgent from localStorage on mount and when conversation/spec changes.
+   *  Skipped when a spec is active — applyModelSpecEphemeralAgent handles both new conversations
+   *  (pure spec values) and existing conversations (spec values + localStorage overrides). */
   useEffect(() => {
     if (isSubmitting) {
       return;
     }
-    // Check if this is a new conversation or the first load
-    if (!hasInitializedRef.current || lastKeyRef.current !== key) {
+    if (specName) {
+      // Spec active: applyModelSpecEphemeralAgent handles all state (spec base + localStorage
+      // overrides for existing conversations). Reset init flag so switching back to non-spec
+      // triggers a fresh re-init.
+      hasInitializedRef.current = false;
+      return;
+    }
+    // Check if this is a new conversation/spec or the first load
+    if (!hasInitializedRef.current || lastContextKeyRef.current !== storageSuffix) {
       hasInitializedRef.current = true;
-      lastKeyRef.current = key;
+      lastContextKeyRef.current = storageSuffix;
 
-      const codeToggleKey = `${LocalStorageKeys.LAST_CODE_TOGGLE_}${key}`;
-      const webSearchToggleKey = `${LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_}${key}`;
-      const fileSearchToggleKey = `${LocalStorageKeys.LAST_FILE_SEARCH_TOGGLE_}${key}`;
-      const artifactsToggleKey = `${LocalStorageKeys.LAST_ARTIFACTS_TOGGLE_}${key}`;
+      const codeToggleKey = `${LocalStorageKeys.LAST_CODE_TOGGLE_}${storageSuffix}`;
+      const webSearchToggleKey = `${LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_}${storageSuffix}`;
+      const fileSearchToggleKey = `${LocalStorageKeys.LAST_FILE_SEARCH_TOGGLE_}${storageSuffix}`;
+      const artifactsToggleKey = `${LocalStorageKeys.LAST_ARTIFACTS_TOGGLE_}${storageSuffix}`;
 
       const codeToggleValue = getTimestampedValue(codeToggleKey);
       const webSearchToggleValue = getTimestampedValue(webSearchToggleKey);
@@ -106,39 +144,53 @@ export default function BadgeRowProvider({
         }
       }
 
-      /**
-       * Always set values for all tools (use defaults if not in `localStorage`)
-       * If `ephemeralAgent` is `null`, create a new object with just our tool values
-       */
-      const finalValues = {
-        [Tools.execute_code]: initialValues[Tools.execute_code] ?? false,
-        [Tools.web_search]: initialValues[Tools.web_search] ?? false,
-        [Tools.file_search]: initialValues[Tools.file_search] ?? false,
-        [AgentCapabilities.artifacts]: initialValues[AgentCapabilities.artifacts] ?? false,
-      };
+      const hasOverrides = Object.keys(initialValues).length > 0;
 
-      setEphemeralAgent((prev) => ({
-        ...(prev || {}),
-        ...finalValues,
-      }));
-
-      Object.entries(finalValues).forEach(([toolKey, value]) => {
-        if (value !== false) {
-          let storageKey = artifactsToggleKey;
-          if (toolKey === Tools.execute_code) {
-            storageKey = codeToggleKey;
-          } else if (toolKey === Tools.web_search) {
-            storageKey = webSearchToggleKey;
-          } else if (toolKey === Tools.file_search) {
-            storageKey = fileSearchToggleKey;
+      /** Read persisted MCP values from localStorage */
+      let mcpOverrides: string[] | null = null;
+      const mcpStorageKey = `${LocalStorageKeys.LAST_MCP_}${storageSuffix}`;
+      const mcpRaw = localStorage.getItem(mcpStorageKey);
+      if (mcpRaw !== null) {
+        try {
+          const parsed = JSON.parse(mcpRaw);
+          if (Array.isArray(parsed) && parsed.length > 0) {
+            mcpOverrides = parsed;
           }
-          // Store the value and set timestamp for existing values
-          localStorage.setItem(storageKey, JSON.stringify(value));
-          setTimestamp(storageKey);
+        } catch (e) {
+          console.error('Failed to parse MCP values:', e);
         }
+      }
+
+      setEphemeralAgent((prev) => {
+        if (prev == null) {
+          /** ephemeralAgent is null — use localStorage defaults */
+          if (hasOverrides || mcpOverrides) {
+            const result = { ...initialValues };
+            if (mcpOverrides) {
+              result.mcp = mcpOverrides;
+            }
+            return result;
+          }
+          return prev;
+        }
+        /** ephemeralAgent already has values (from prior state).
+         *  Only fill in undefined keys from localStorage. */
+        let changed = false;
+        const result = { ...prev };
+        for (const [toolKey, value] of Object.entries(initialValues)) {
+          if (result[toolKey] === undefined) {
+            result[toolKey] = value;
+            changed = true;
+          }
+        }
+        if (mcpOverrides && result.mcp === undefined) {
+          result.mcp = mcpOverrides;
+          changed = true;
+        }
+        return changed ? result : prev;
       });
     }
-  }, [key, isSubmitting, setEphemeralAgent]);
+  }, [storageSuffix, specName, isSubmitting, setEphemeralAgent]);
 
   /** CodeInterpreter hooks */
   const codeApiKeyForm = useCodeApiKeyForm({});
@@ -146,6 +198,7 @@ export default function BadgeRowProvider({
 
   const codeInterpreter = useToolToggle({
     conversationId,
+    storageContextKey,
     setIsDialogOpen: setCodeDialogOpen,
     toolKey: Tools.execute_code,
     localStorageKey: LocalStorageKeys.LAST_CODE_TOGGLE_,
@@ -161,6 +214,7 @@ export default function BadgeRowProvider({
 
   const webSearch = useToolToggle({
     conversationId,
+    storageContextKey,
     toolKey: Tools.web_search,
     localStorageKey: LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_,
     setIsDialogOpen: setWebSearchDialogOpen,
@@ -173,6 +227,7 @@ export default function BadgeRowProvider({
   /** FileSearch hook */
   const fileSearch = useToolToggle({
     conversationId,
+    storageContextKey,
     toolKey: Tools.file_search,
     localStorageKey: LocalStorageKeys.LAST_FILE_SEARCH_TOGGLE_,
     isAuthenticated: true,
@@ -181,12 +236,13 @@ export default function BadgeRowProvider({
   /** Artifacts hook - using a custom key since it's not a Tool but a capability */
   const artifacts = useToolToggle({
     conversationId,
+    storageContextKey,
     toolKey: AgentCapabilities.artifacts,
     localStorageKey: LocalStorageKeys.LAST_ARTIFACTS_TOGGLE_,
     isAuthenticated: true,
   });
 
-  const mcpServerManager = useMCPServerManager({ conversationId });
+  const mcpServerManager = useMCPServerManager({ conversationId, storageContextKey });
 
   const value: BadgeRowContextType = {
     webSearch,
@@ -194,6 +250,7 @@ export default function BadgeRowProvider({
     fileSearch,
     agentsConfig,
     conversationId,
+    storageContextKey,
     codeApiKeyForm,
     codeInterpreter,
     searchApiKeyForm,
diff --git a/client/src/common/agents-types.ts b/client/src/common/agents-types.ts
index 9ac6b440a3..c3ea06f890 100644
--- a/client/src/common/agents-types.ts
+++ b/client/src/common/agents-types.ts
@@ -1,6 +1,7 @@
 import { AgentCapabilities, ArtifactModes } from 'librechat-data-provider';
 import type {
   AgentModelParameters,
+  AgentToolOptions,
   SupportContact,
   AgentProvider,
   GraphEdge,
@@ -8,6 +9,8 @@ import type {
 } from 'librechat-data-provider';
 import type { OptionWithIcon, ExtendedFile } from './types';
 
+export type AgentQueryResult = { found: true; agent: Agent } | { found: false };
+
 export type TAgentOption = OptionWithIcon &
   Agent & {
     knowledge_files?: Array<[string, ExtendedFile]>;
@@ -33,6 +36,8 @@ export type AgentForm = {
   model: string | null;
   model_parameters: AgentModelParameters;
   tools?: string[];
+  /** Per-tool configuration options (deferred loading, allowed callers, etc.) */
+  tool_options?: AgentToolOptions;
   provider?: AgentProvider | OptionWithIcon;
   /** @deprecated Use edges instead */
   agent_ids?: string[];
diff --git a/client/src/common/menus.ts b/client/src/common/menus.ts
index 97c2d1b11b..ee7d7292c9 100644
--- a/client/src/common/menus.ts
+++ b/client/src/common/menus.ts
@@ -15,6 +15,8 @@ export interface MenuItemProps {
   separate?: boolean;
   hideOnClick?: boolean;
   dialog?: React.ReactElement;
+  ariaLabel?: string;
+  ariaChecked?: boolean;
   ref?: React.Ref<any>;
   className?: string;
   render?:
diff --git a/client/src/components/Auth/LoginForm.tsx b/client/src/components/Auth/LoginForm.tsx
index 0a6e1e8614..c51c2002e3 100644
--- a/client/src/components/Auth/LoginForm.tsx
+++ b/client/src/components/Auth/LoginForm.tsx
@@ -5,6 +5,7 @@ import { ThemeContext, Spinner, Button, isDark } from '@librechat/client';
 import type { TLoginUser, TStartupConfig } from 'librechat-data-provider';
 import type { TAuthContext } from '~/common';
 import { useResendVerificationEmail, useGetStartupConfig } from '~/data-provider';
+import { validateEmail } from '~/utils';
 import { useLocalize } from '~/hooks';
 
 type TLoginFormProps = {
@@ -96,10 +97,9 @@ const LoginForm: React.FC<TLoginFormProps> = ({ onSubmit, startupConfig, error,
               {...register('email', {
                 required: localize('com_auth_email_required'),
                 maxLength: { value: 120, message: localize('com_auth_email_max_length') },
-                pattern: {
-                  value: useUsernameLogin ? /\S+/ : /\S+@\S+\.\S+/,
-                  message: localize('com_auth_email_pattern'),
-                },
+                validate: useUsernameLogin
+                  ? undefined
+                  : (value) => validateEmail(value, localize('com_auth_email_pattern')),
               })}
               aria-invalid={!!errors.email}
               className="webkit-dark-styles transition-color peer w-full rounded-2xl border border-border-light bg-surface-primary px-3.5 pb-2.5 pt-3 text-text-primary duration-200 focus:border-green-500 focus:outline-none"
diff --git a/client/src/components/Chat/Footer.tsx b/client/src/components/Chat/Footer.tsx
index 72aa04be57..75dd853c4f 100644
--- a/client/src/components/Chat/Footer.tsx
+++ b/client/src/components/Chat/Footer.tsx
@@ -13,30 +13,14 @@ export default function Footer({ className }: { className?: string }) {
   const termsOfService = config?.interface?.termsOfService;
 
   const privacyPolicyRender = privacyPolicy?.externalUrl != null && (
-    <a
-      className="text-text-secondary underline"
-      href={privacyPolicy.externalUrl}
-      target={privacyPolicy.openNewTab === true ? '_blank' : undefined}
-      rel="noreferrer"
-    >
+    <a className="text-text-secondary underline" href={privacyPolicy.externalUrl} rel="noreferrer">
       {localize('com_ui_privacy_policy')}
-      {privacyPolicy.openNewTab === true && (
-        <span className="sr-only">{' ' + localize('com_ui_opens_new_tab')}</span>
-      )}
     </a>
   );
 
   const termsOfServiceRender = termsOfService?.externalUrl != null && (
-    <a
-      className="text-text-secondary underline"
-      href={termsOfService.externalUrl}
-      target={termsOfService.openNewTab === true ? '_blank' : undefined}
-      rel="noreferrer"
-    >
+    <a className="text-text-secondary underline" href={termsOfService.externalUrl} rel="noreferrer">
       {localize('com_ui_terms_of_service')}
-      {termsOfService.openNewTab === true && (
-        <span className="sr-only">{' ' + localize('com_ui_opens_new_tab')}</span>
-      )}
     </a>
   );
 
@@ -67,12 +51,10 @@ export default function Footer({ className }: { className?: string }) {
               <a
                 className="text-text-secondary underline"
                 href={href}
-                target="_blank"
                 rel="noreferrer"
                 {...otherProps}
               >
                 {children}
-                <span className="sr-only">{' ' + localize('com_ui_opens_new_tab')}</span>
               </a>
             );
           },
diff --git a/client/src/components/Chat/Input/BadgeRow.tsx b/client/src/components/Chat/Input/BadgeRow.tsx
index 5036dcd5e4..6fea6b0d58 100644
--- a/client/src/components/Chat/Input/BadgeRow.tsx
+++ b/client/src/components/Chat/Input/BadgeRow.tsx
@@ -28,6 +28,7 @@ interface BadgeRowProps {
   onChange: (badges: Pick<BadgeItem, 'id'>[]) => void;
   onToggle?: (badgeId: string, currentActive: boolean) => void;
   conversationId?: string | null;
+  specName?: string | null;
   isSubmitting?: boolean;
   isInChat: boolean;
 }
@@ -142,6 +143,7 @@ const dragReducer = (state: DragState, action: DragAction): DragState => {
 function BadgeRow({
   showEphemeralBadges,
   conversationId,
+  specName,
   isSubmitting,
   onChange,
   onToggle,
@@ -320,7 +322,11 @@ function BadgeRow({
   }, [dragState.draggedBadge, handleMouseMove, handleMouseUp]);
 
   return (
-    <BadgeRowProvider conversationId={conversationId} isSubmitting={isSubmitting}>
+    <BadgeRowProvider
+      conversationId={conversationId}
+      specName={specName}
+      isSubmitting={isSubmitting}
+    >
       <div ref={containerRef} className="relative flex flex-wrap items-center gap-2">
         {showEphemeralBadges === true && <ToolsDropdown />}
         {tempBadges.map((badge, index) => (
diff --git a/client/src/components/Chat/Input/ChatForm.tsx b/client/src/components/Chat/Input/ChatForm.tsx
index cb1e30a09d..45277e5b9c 100644
--- a/client/src/components/Chat/Input/ChatForm.tsx
+++ b/client/src/components/Chat/Input/ChatForm.tsx
@@ -258,7 +258,17 @@ const ChatForm = memo(({ index = 0 }: { index?: number }) => {
             <FileFormChat conversation={conversation} />
             {endpoint && (
               <div className={cn('flex', isRTL ? 'flex-row-reverse' : 'flex-row')}>
-                <div className="relative flex-1">
+                <div
+                  className="relative flex-1"
+                  style={
+                    isCollapsed
+                      ? {
+                          WebkitMaskImage: 'linear-gradient(to bottom, black 60%, transparent 90%)',
+                          maskImage: 'linear-gradient(to bottom, black 60%, transparent 90%)',
+                        }
+                      : undefined
+                  }
+                >
                   <TextareaAutosize
                     {...registerProps}
                     ref={(e) => {
@@ -290,16 +300,6 @@ const ChatForm = memo(({ index = 0 }: { index?: number }) => {
                       'scrollbar-hover transition-[max-height] duration-200 disabled:cursor-not-allowed',
                     )}
                   />
-                  {isCollapsed && (
-                    <div
-                      className="pointer-events-none absolute bottom-0 left-0 right-0 h-10 transition-all duration-200"
-                      style={{
-                        backdropFilter: 'blur(2px)',
-                        WebkitMaskImage: 'linear-gradient(to top, black 15%, transparent 75%)',
-                        maskImage: 'linear-gradient(to top, black 15%, transparent 75%)',
-                      }}
-                    />
-                  )}
                 </div>
                 <div className="flex flex-col items-start justify-start pr-2.5 pt-1.5">
                   <CollapseChat
@@ -325,6 +325,7 @@ const ChatForm = memo(({ index = 0 }: { index?: number }) => {
                 }
                 isSubmitting={isSubmitting}
                 conversationId={conversationId}
+                specName={conversation?.spec}
                 onChange={setBadges}
                 isInChat={
                   Array.isArray(conversation?.messages) && conversation.messages.length >= 1
diff --git a/client/src/components/Chat/Input/Files/ImagePreview.tsx b/client/src/components/Chat/Input/Files/ImagePreview.tsx
index c675c9326c..2714c3677f 100644
--- a/client/src/components/Chat/Input/Files/ImagePreview.tsx
+++ b/client/src/components/Chat/Input/Files/ImagePreview.tsx
@@ -158,11 +158,11 @@ const ImagePreview = ({
       <DialogPrimitive.Root open={isModalOpen} onOpenChange={handleOpenChange}>
         <DialogPrimitive.Portal>
           <DialogPrimitive.Overlay
-            className="fixed inset-0 z-[100] bg-black/90"
+            className="fixed inset-0 z-[250] bg-black/90"
             onClick={handleBackgroundClick}
           />
           <DialogPrimitive.Content
-            className="fixed inset-0 z-[100] flex items-center justify-center outline-none"
+            className="fixed inset-0 z-[250] flex items-center justify-center outline-none"
             onOpenAutoFocus={(e) => {
               e.preventDefault();
               closeButtonRef.current?.focus();
diff --git a/client/src/components/Chat/Input/MCPSelect.tsx b/client/src/components/Chat/Input/MCPSelect.tsx
index 278e603db0..a5356f5094 100644
--- a/client/src/components/Chat/Input/MCPSelect.tsx
+++ b/client/src/components/Chat/Input/MCPSelect.tsx
@@ -11,7 +11,7 @@ import { useHasAccess } from '~/hooks';
 import { cn } from '~/utils';
 
 function MCPSelectContent() {
-  const { conversationId, mcpServerManager } = useBadgeRowContext();
+  const { conversationId, storageContextKey, mcpServerManager } = useBadgeRowContext();
   const {
     localize,
     isPinned,
@@ -128,7 +128,11 @@ function MCPSelectContent() {
         </Ariakit.Menu>
       </Ariakit.MenuProvider>
       {configDialogProps && (
-        <MCPConfigDialog {...configDialogProps} conversationId={conversationId} />
+        <MCPConfigDialog
+          {...configDialogProps}
+          conversationId={conversationId}
+          storageContextKey={storageContextKey}
+        />
       )}
     </>
   );
diff --git a/client/src/components/Chat/Input/MCPSubMenu.tsx b/client/src/components/Chat/Input/MCPSubMenu.tsx
index ca547ca1f7..b0b8fad1bb 100644
--- a/client/src/components/Chat/Input/MCPSubMenu.tsx
+++ b/client/src/components/Chat/Input/MCPSubMenu.tsx
@@ -15,7 +15,7 @@ interface MCPSubMenuProps {
 const MCPSubMenu = React.forwardRef<HTMLDivElement, MCPSubMenuProps>(
   ({ placeholder, ...props }, ref) => {
     const localize = useLocalize();
-    const { mcpServerManager } = useBadgeRowContext();
+    const { storageContextKey, mcpServerManager } = useBadgeRowContext();
     const {
       isPinned,
       mcpValues,
@@ -106,7 +106,9 @@ const MCPSubMenu = React.forwardRef<HTMLDivElement, MCPSubMenuProps>(
             </div>
           </Ariakit.Menu>
         </Ariakit.MenuProvider>
-        {configDialogProps && <MCPConfigDialog {...configDialogProps} />}
+        {configDialogProps && (
+          <MCPConfigDialog {...configDialogProps} storageContextKey={storageContextKey} />
+        )}
       </div>
     );
   },
diff --git a/client/src/components/Chat/Input/Mention.tsx b/client/src/components/Chat/Input/Mention.tsx
index 2defcc7623..9e56068def 100644
--- a/client/src/components/Chat/Input/Mention.tsx
+++ b/client/src/components/Chat/Input/Mention.tsx
@@ -12,7 +12,7 @@ import useMentions from '~/hooks/Input/useMentions';
 import { removeCharIfLast } from '~/utils';
 import MentionItem from './MentionItem';
 
-const ROW_HEIGHT = 40;
+const ROW_HEIGHT = 44;
 
 export default function Mention({
   conversation,
diff --git a/client/src/components/Chat/Input/MentionItem.tsx b/client/src/components/Chat/Input/MentionItem.tsx
index fcfb22c312..6c978240ee 100644
--- a/client/src/components/Chat/Input/MentionItem.tsx
+++ b/client/src/components/Chat/Input/MentionItem.tsx
@@ -25,15 +25,16 @@ export default function MentionItem({
 }: MentionItemProps) {
   return (
     <button
+      type="button"
+      style={style}
       tabIndex={index}
       onClick={onClick}
       id={`${type}-item-${index}`}
-      className="w-full"
-      style={style}
+      className="w-full touch-manipulation"
     >
       <div
         className={cn(
-          'text-token-text-primary bg-token-main-surface-secondary group flex h-10 items-center gap-2 rounded-lg px-2 text-sm font-medium hover:bg-surface-secondary',
+          'text-token-text-primary bg-token-main-surface-secondary group flex min-h-[44px] items-center gap-2 rounded-lg px-2 text-sm font-medium hover:bg-surface-secondary active:bg-surface-active',
           isActive === true ? 'bg-surface-active' : 'bg-transparent',
         )}
       >
diff --git a/client/src/components/Chat/Input/PromptsCommand.tsx b/client/src/components/Chat/Input/PromptsCommand.tsx
index 2ea36a5236..1740ed43a2 100644
--- a/client/src/components/Chat/Input/PromptsCommand.tsx
+++ b/client/src/components/Chat/Input/PromptsCommand.tsx
@@ -4,8 +4,8 @@ import { Spinner, useCombobox } from '@librechat/client';
 import { useSetRecoilState, useRecoilValue } from 'recoil';
 import type { TPromptGroup } from 'librechat-data-provider';
 import type { PromptOption } from '~/common';
-import { removeCharIfLast, detectVariables } from '~/utils';
 import VariableDialog from '~/components/Prompts/Groups/VariableDialog';
+import { removeCharIfLast, detectVariables } from '~/utils';
 import { usePromptGroupsContext } from '~/Providers';
 import MentionItem from './MentionItem';
 import { useLocalize } from '~/hooks';
@@ -48,7 +48,7 @@ const PopoverContainer = memo(
   },
 );
 
-const ROW_HEIGHT = 40;
+const ROW_HEIGHT = 44;
 
 function PromptsCommand({
   index,
diff --git a/client/src/components/Chat/Input/SendButton.tsx b/client/src/components/Chat/Input/SendButton.tsx
index 14c21f0586..a07e574928 100644
--- a/client/src/components/Chat/Input/SendButton.tsx
+++ b/client/src/components/Chat/Input/SendButton.tsx
@@ -41,7 +41,8 @@ const SubmitButton = React.memo(
 const SendButton = React.memo(
   forwardRef((props: SendButtonProps, ref: React.ForwardedRef<HTMLButtonElement>) => {
     const data = useWatch({ control: props.control });
-    return <SubmitButton ref={ref} disabled={props.disabled || !data.text} />;
+    const content = data?.text?.trim();
+    return <SubmitButton ref={ref} disabled={props.disabled || !content} />;
   }),
 );
 
diff --git a/client/src/components/Chat/Menus/BookmarkMenu.tsx b/client/src/components/Chat/Menus/BookmarkMenu.tsx
index bb0dd464c2..ac7b17985e 100644
--- a/client/src/components/Chat/Menus/BookmarkMenu.tsx
+++ b/client/src/components/Chat/Menus/BookmarkMenu.tsx
@@ -99,6 +99,16 @@ const BookmarkMenu: FC = () => {
 
   const newBookmarkRef = useRef<HTMLButtonElement>(null);
 
+  const tagsCount = tags?.length ?? 0;
+  const hasBookmarks = tagsCount > 0;
+
+  const buttonAriaLabel = useMemo(() => {
+    if (tagsCount > 0) {
+      return localize('com_ui_bookmarks_count_selected', { count: tagsCount });
+    }
+    return localize('com_ui_bookmarks_add');
+  }, [tagsCount, localize]);
+
   const dropdownItems: t.MenuItemProps[] = useMemo(() => {
     const items: t.MenuItemProps[] = [
       {
@@ -114,19 +124,19 @@ const BookmarkMenu: FC = () => {
 
     if (data) {
       for (const tag of data) {
-        const isSelected = tags?.includes(tag.tag);
+        const isSelected = tags?.includes(tag.tag) === true;
         items.push({
           id: tag.tag,
           label: tag.tag,
           hideOnClick: false,
-          icon:
-            isSelected === true ? (
-              <BookmarkFilledIcon className="size-4" />
-            ) : (
-              <BookmarkIcon className="size-4" />
-            ),
+          icon: isSelected ? (
+            <BookmarkFilledIcon className="size-4" />
+          ) : (
+            <BookmarkIcon className="size-4" />
+          ),
           onClick: () => handleSubmit(tag.tag),
           disabled: mutation.isLoading,
+          ariaChecked: isSelected,
         });
       }
     }
@@ -146,10 +156,10 @@ const BookmarkMenu: FC = () => {
     if (mutation.isLoading) {
       return <Spinner aria-label="Spinner" />;
     }
-    if ((tags?.length ?? 0) > 0) {
-      return <BookmarkFilledIcon className="icon-lg" aria-label="Filled Bookmark" />;
+    if (hasBookmarks) {
+      return <BookmarkFilledIcon className="icon-lg" aria-hidden="true" />;
     }
-    return <BookmarkIcon className="icon-lg" aria-label="Bookmark" />;
+    return <BookmarkIcon className="icon-lg" aria-hidden="true" />;
   };
 
   return (
@@ -168,7 +178,8 @@ const BookmarkMenu: FC = () => {
             render={
               <Ariakit.MenuButton
                 id="bookmark-menu-button"
-                aria-label={localize('com_ui_bookmarks_add')}
+                aria-label={buttonAriaLabel}
+                aria-pressed={hasBookmarks}
                 className={cn(
                   'mt-text-sm flex size-10 flex-shrink-0 items-center justify-center gap-2 rounded-xl border border-border-light bg-presentation text-sm transition-colors duration-200 hover:bg-surface-hover',
                   isMenuOpen ? 'bg-surface-hover' : '',
diff --git a/client/src/components/Chat/Menus/Endpoints/ModelSelectorContext.tsx b/client/src/components/Chat/Menus/Endpoints/ModelSelectorContext.tsx
index 26d476e85d..dd08728560 100644
--- a/client/src/components/Chat/Menus/Endpoints/ModelSelectorContext.tsx
+++ b/client/src/components/Chat/Menus/Endpoints/ModelSelectorContext.tsx
@@ -1,5 +1,5 @@
 import debounce from 'lodash/debounce';
-import React, { createContext, useContext, useState, useMemo } from 'react';
+import React, { createContext, useContext, useState, useMemo, useCallback } from 'react';
 import { EModelEndpoint, isAgentsEndpoint, isAssistantsEndpoint } from 'librechat-data-provider';
 import type * as t from 'librechat-data-provider';
 import type { Endpoint, SelectedValues } from '~/common';
@@ -8,8 +8,9 @@ import {
   useSelectorEffects,
   useKeyDialog,
   useEndpoints,
+  useLocalize,
 } from '~/hooks';
-import { useAgentsMapContext, useAssistantsMapContext } from '~/Providers';
+import { useAgentsMapContext, useAssistantsMapContext, useLiveAnnouncer } from '~/Providers';
 import { useGetEndpointsQuery, useListAgentsQuery } from '~/data-provider';
 import { useModelSelectorChatContext } from './ModelSelectorChatContext';
 import useSelectMention from '~/hooks/Input/useSelectMention';
@@ -59,6 +60,8 @@ export function ModelSelectorProvider({ children, startupConfig }: ModelSelector
   const { data: endpointsConfig } = useGetEndpointsQuery();
   const { endpoint, model, spec, agent_id, assistant_id, conversation, newConversation } =
     useModelSelectorChatContext();
+  const localize = useLocalize();
+  const { announcePolite } = useLiveAnnouncer();
   const modelSpecs = useMemo(() => {
     const specs = startupConfig?.modelSpecs?.list ?? [];
     if (!agentsMap) {
@@ -93,6 +96,21 @@ export function ModelSelectorProvider({ children, startupConfig }: ModelSelector
     endpointsConfig,
   });
 
+  const getModelDisplayName = useCallback(
+    (endpoint: Endpoint, model: string): string => {
+      if (isAgentsEndpoint(endpoint.value)) {
+        return endpoint.agentNames?.[model] ?? agentsMap?.[model]?.name ?? model;
+      }
+
+      if (isAssistantsEndpoint(endpoint.value)) {
+        return endpoint.assistantNames?.[model] ?? model;
+      }
+
+      return model;
+    },
+    [agentsMap],
+  );
+
   const { onSelectEndpoint, onSelectSpec } = useSelectMention({
     // presets,
     modelSpecs,
@@ -207,6 +225,10 @@ export function ModelSelectorProvider({ children, startupConfig }: ModelSelector
       model,
       modelSpec: '',
     });
+
+    const modelDisplayName = getModelDisplayName(endpoint, model);
+    const announcement = localize('com_ui_model_selected', { 0: modelDisplayName });
+    announcePolite({ message: announcement, isStatus: true });
   };
 
   const value = {
diff --git a/client/src/components/Chat/Menus/Endpoints/components/EndpointItem.tsx b/client/src/components/Chat/Menus/Endpoints/components/EndpointItem.tsx
index 8b7c4f8486..6f73f76d79 100644
--- a/client/src/components/Chat/Menus/Endpoints/components/EndpointItem.tsx
+++ b/client/src/components/Chat/Menus/Endpoints/components/EndpointItem.tsx
@@ -1,4 +1,5 @@
 import { useMemo } from 'react';
+import { VisuallyHidden } from '@ariakit/react';
 import { Spinner, TooltipAnchor } from '@librechat/client';
 import { CheckCircle2, MousePointerClick, SettingsIcon } from 'lucide-react';
 import { EModelEndpoint, isAgentsEndpoint, isAssistantsEndpoint } from 'librechat-data-provider';
@@ -79,12 +80,76 @@ const SettingsButton = ({
   );
 };
 
+/**
+ * Lazily-rendered content for an endpoint submenu. By extracting this into a
+ * separate component, the expensive model-list rendering (and per-item hooks
+ * such as MutationObservers in EndpointModelItem) only runs when the submenu
+ * is actually mounted — which Ariakit defers via `unmountOnHide`.
+ */
+function EndpointMenuContent({
+  endpoint,
+  endpointIndex,
+}: {
+  endpoint: Endpoint;
+  endpointIndex: number;
+}) {
+  const localize = useLocalize();
+  const { agentsMap, assistantsMap, modelSpecs, selectedValues, endpointSearchValues } =
+    useModelSelectorContext();
+  const { model: selectedModel, modelSpec: selectedSpec } = selectedValues;
+  const searchValue = endpointSearchValues[endpoint.value] || '';
+
+  const endpointSpecs = useMemo(() => {
+    if (!modelSpecs || !modelSpecs.length) {
+      return [];
+    }
+    return modelSpecs.filter((spec: TModelSpec) => spec.group === endpoint.value);
+  }, [modelSpecs, endpoint.value]);
+
+  if (isAssistantsEndpoint(endpoint.value) && endpoint.models === undefined) {
+    return (
+      <div
+        className="flex items-center justify-center p-2"
+        role="status"
+        aria-label={localize('com_ui_loading')}
+      >
+        <Spinner aria-hidden="true" />
+      </div>
+    );
+  }
+
+  const filteredModels = searchValue
+    ? filterModels(
+        endpoint,
+        (endpoint.models || []).map((model) => model.name),
+        searchValue,
+        agentsMap,
+        assistantsMap,
+      )
+    : null;
+
+  return (
+    <>
+      {endpointSpecs.map((spec: TModelSpec) => (
+        <ModelSpecItem key={spec.name} spec={spec} isSelected={selectedSpec === spec.name} />
+      ))}
+      {filteredModels
+        ? renderEndpointModels(
+            endpoint,
+            endpoint.models || [],
+            selectedModel,
+            filteredModels,
+            endpointIndex,
+          )
+        : endpoint.models &&
+          renderEndpointModels(endpoint, endpoint.models, selectedModel, undefined, endpointIndex)}
+    </>
+  );
+}
+
 export function EndpointItem({ endpoint, endpointIndex }: EndpointItemProps) {
   const localize = useLocalize();
   const {
-    agentsMap,
-    assistantsMap,
-    modelSpecs,
     selectedValues,
     handleOpenKeyDialog,
     handleSelectEndpoint,
@@ -92,19 +157,7 @@ export function EndpointItem({ endpoint, endpointIndex }: EndpointItemProps) {
     setEndpointSearchValue,
     endpointRequiresUserKey,
   } = useModelSelectorContext();
-  const {
-    model: selectedModel,
-    endpoint: selectedEndpoint,
-    modelSpec: selectedSpec,
-  } = selectedValues;
-
-  // Filter modelSpecs for this endpoint (by group matching endpoint value)
-  const endpointSpecs = useMemo(() => {
-    if (!modelSpecs || !modelSpecs.length) {
-      return [];
-    }
-    return modelSpecs.filter((spec: TModelSpec) => spec.group === endpoint.value);
-  }, [modelSpecs, endpoint.value]);
+  const { endpoint: selectedEndpoint } = selectedValues;
 
   const searchValue = endpointSearchValues[endpoint.value] || '';
   const isUserProvided = useMemo(
@@ -126,16 +179,9 @@ export function EndpointItem({ endpoint, endpointIndex }: EndpointItemProps) {
     </div>
   );
 
+  const isEndpointSelected = selectedEndpoint === endpoint.value;
+
   if (endpoint.hasModels) {
-    const filteredModels = searchValue
-      ? filterModels(
-          endpoint,
-          (endpoint.models || []).map((model) => model.name),
-          searchValue,
-          agentsMap,
-          assistantsMap,
-        )
-      : null;
     const placeholder =
       isAgentsEndpoint(endpoint.value) || isAssistantsEndpoint(endpoint.value)
         ? localize('com_endpoint_search_var', { 0: endpoint.label })
@@ -144,7 +190,6 @@ export function EndpointItem({ endpoint, endpointIndex }: EndpointItemProps) {
       <Menu
         id={`endpoint-${endpoint.value}-menu`}
         key={`endpoint-${endpoint.value}-item`}
-        defaultOpen={endpoint.value === selectedEndpoint}
         searchValue={searchValue}
         onSearch={(value) => setEndpointSearchValue(endpoint.value, value)}
         combobox={<input placeholder=" " />}
@@ -153,45 +198,21 @@ export function EndpointItem({ endpoint, endpointIndex }: EndpointItemProps) {
         label={
           <div className="group flex w-full min-w-0 items-center justify-between gap-1.5 py-1 text-sm">
             {renderIconLabel()}
-            {isUserProvided && (
-              <SettingsButton endpoint={endpoint} handleOpenKeyDialog={handleOpenKeyDialog} />
-            )}
+            <div className="flex shrink-0 items-center gap-1">
+              {isUserProvided && (
+                <SettingsButton endpoint={endpoint} handleOpenKeyDialog={handleOpenKeyDialog} />
+              )}
+              {isEndpointSelected && (
+                <>
+                  <CheckCircle2 className="size-4 shrink-0 text-text-primary" aria-hidden="true" />
+                  <VisuallyHidden>{localize('com_a11y_selected')}</VisuallyHidden>
+                </>
+              )}
+            </div>
           </div>
         }
       >
-        {isAssistantsEndpoint(endpoint.value) && endpoint.models === undefined ? (
-          <div
-            className="flex items-center justify-center p-2"
-            role="status"
-            aria-label={localize('com_ui_loading')}
-          >
-            <Spinner aria-hidden="true" />
-          </div>
-        ) : (
-          <>
-            {/* Render modelSpecs for this endpoint */}
-            {endpointSpecs.map((spec: TModelSpec) => (
-              <ModelSpecItem key={spec.name} spec={spec} isSelected={selectedSpec === spec.name} />
-            ))}
-            {/* Render endpoint models */}
-            {filteredModels
-              ? renderEndpointModels(
-                  endpoint,
-                  endpoint.models || [],
-                  selectedModel,
-                  filteredModels,
-                  endpointIndex,
-                )
-              : endpoint.models &&
-                renderEndpointModels(
-                  endpoint,
-                  endpoint.models,
-                  selectedModel,
-                  undefined,
-                  endpointIndex,
-                )}
-          </>
-        )}
+        <EndpointMenuContent endpoint={endpoint} endpointIndex={endpointIndex} />
       </Menu>
     );
   } else {
@@ -200,6 +221,7 @@ export function EndpointItem({ endpoint, endpointIndex }: EndpointItemProps) {
         id={`endpoint-${endpoint.value}-menu`}
         key={`endpoint-${endpoint.value}-item`}
         onClick={() => handleSelectEndpoint(endpoint)}
+        aria-selected={isEndpointSelected || undefined}
         className="group flex w-full cursor-pointer items-center justify-between gap-1.5 py-2 text-sm"
       >
         {renderIconLabel()}
@@ -218,8 +240,11 @@ export function EndpointItem({ endpoint, endpointIndex }: EndpointItemProps) {
               }
             />
           )}
-          {selectedEndpoint === endpoint.value && !isAssistantsNotLoaded && (
-            <CheckCircle2 className="size-4 shrink-0 text-text-primary" aria-hidden="true" />
+          {isEndpointSelected && !isAssistantsNotLoaded && (
+            <>
+              <CheckCircle2 className="size-4 shrink-0 text-text-primary" aria-hidden="true" />
+              <VisuallyHidden>{localize('com_a11y_selected')}</VisuallyHidden>
+            </>
           )}
         </div>
       </MenuItem>
diff --git a/client/src/components/Chat/Menus/Endpoints/components/EndpointModelItem.tsx b/client/src/components/Chat/Menus/Endpoints/components/EndpointModelItem.tsx
index cb9d24eb61..752788d63a 100644
--- a/client/src/components/Chat/Menus/Endpoints/components/EndpointModelItem.tsx
+++ b/client/src/components/Chat/Menus/Endpoints/components/EndpointModelItem.tsx
@@ -1,5 +1,6 @@
 import React, { useRef, useState, useEffect } from 'react';
-import { EarthIcon, Pin, PinOff } from 'lucide-react';
+import { VisuallyHidden } from '@ariakit/react';
+import { CheckCircle2, EarthIcon, Pin, PinOff } from 'lucide-react';
 import { isAgentsEndpoint, isAssistantsEndpoint } from 'librechat-data-provider';
 import { useModelSelectorContext } from '../ModelSelectorContext';
 import { CustomMenuItem as MenuItem } from '../CustomMenu';
@@ -110,6 +111,7 @@ export function EndpointModelItem({ modelId, endpoint, isSelected }: EndpointMod
     <MenuItem
       ref={itemRef}
       onClick={() => handleSelectModel(endpoint, modelId ?? '')}
+      aria-selected={isSelected || undefined}
       className="group flex w-full cursor-pointer items-center justify-between rounded-lg px-2 text-sm"
     >
       <div className="flex w-full min-w-0 items-center gap-2 px-1 py-1">
@@ -133,23 +135,10 @@ export function EndpointModelItem({ modelId, endpoint, isSelected }: EndpointMod
         )}
       </button>
       {isSelected && (
-        <div className="flex-shrink-0 self-center">
-          <svg
-            width="16"
-            height="16"
-            viewBox="0 0 24 24"
-            fill="none"
-            xmlns="http://www.w3.org/2000/svg"
-            className="block"
-          >
-            <path
-              fillRule="evenodd"
-              clipRule="evenodd"
-              d="M2 12C2 6.47715 6.47715 2 12 2C17.5228 2 22 6.47715 22 12C22 17.5228 17.5228 22 12 22C6.47715 22 2 17.5228 2 12ZM16.0755 7.93219C16.5272 8.25003 16.6356 8.87383 16.3178 9.32549L11.5678 16.0755C11.3931 16.3237 11.1152 16.4792 10.8123 16.4981C10.5093 16.517 10.2142 16.3973 10.0101 16.1727L7.51006 13.4227C7.13855 13.014 7.16867 12.3816 7.57733 12.0101C7.98598 11.6386 8.61843 11.6687 8.98994 12.0773L10.6504 13.9039L14.6822 8.17451C15 7.72284 15.6238 7.61436 16.0755 7.93219Z"
-              fill="currentColor"
-            />
-          </svg>
-        </div>
+        <>
+          <CheckCircle2 className="size-4 shrink-0 text-text-primary" aria-hidden="true" />
+          <VisuallyHidden>{localize('com_a11y_selected')}</VisuallyHidden>
+        </>
       )}
     </MenuItem>
   );
diff --git a/client/src/components/Chat/Menus/Endpoints/components/ModelSpecItem.tsx b/client/src/components/Chat/Menus/Endpoints/components/ModelSpecItem.tsx
index a7465a0280..b3d3e118b6 100644
--- a/client/src/components/Chat/Menus/Endpoints/components/ModelSpecItem.tsx
+++ b/client/src/components/Chat/Menus/Endpoints/components/ModelSpecItem.tsx
@@ -1,7 +1,10 @@
 import React from 'react';
+import { CheckCircle2 } from 'lucide-react';
+import { VisuallyHidden } from '@ariakit/react';
 import type { TModelSpec } from 'librechat-data-provider';
 import { CustomMenuItem as MenuItem } from '../CustomMenu';
 import { useModelSelectorContext } from '../ModelSelectorContext';
+import { useLocalize } from '~/hooks';
 import SpecIcon from './SpecIcon';
 import { cn } from '~/utils';
 
@@ -11,12 +14,14 @@ interface ModelSpecItemProps {
 }
 
 export function ModelSpecItem({ spec, isSelected }: ModelSpecItemProps) {
+  const localize = useLocalize();
   const { handleSelectSpec, endpointsConfig } = useModelSelectorContext();
   const { showIconInMenu = true } = spec;
   return (
     <MenuItem
       key={spec.name}
       onClick={() => handleSelectSpec(spec)}
+      aria-selected={isSelected || undefined}
       className={cn(
         'flex w-full cursor-pointer items-center justify-between rounded-lg px-2 text-sm',
       )}
@@ -40,23 +45,13 @@ export function ModelSpecItem({ spec, isSelected }: ModelSpecItemProps) {
         </div>
       </div>
       {isSelected && (
-        <div className="flex-shrink-0 self-center">
-          <svg
-            width="16"
-            height="16"
-            viewBox="0 0 24 24"
-            fill="none"
-            xmlns="http://www.w3.org/2000/svg"
-            className="block"
-          >
-            <path
-              fillRule="evenodd"
-              clipRule="evenodd"
-              d="M2 12C2 6.47715 6.47715 2 12 2C17.5228 2 22 6.47715 22 12C22 17.5228 17.5228 22 12 22C6.47715 22 2 17.5228 2 12ZM16.0755 7.93219C16.5272 8.25003 16.6356 8.87383 16.3178 9.32549L11.5678 16.0755C11.3931 16.3237 11.1152 16.4792 10.8123 16.4981C10.5093 16.517 10.2142 16.3973 10.0101 16.1727L7.51006 13.4227C7.13855 13.014 7.16867 12.3816 7.57733 12.0101C7.98598 11.6386 8.61843 11.6687 8.98994 12.0773L10.6504 13.9039L14.6822 8.17451C15 7.72284 15.6238 7.61436 16.0755 7.93219Z"
-              fill="currentColor"
-            />
-          </svg>
-        </div>
+        <>
+          <CheckCircle2
+            className="size-4 shrink-0 self-center text-text-primary"
+            aria-hidden="true"
+          />
+          <VisuallyHidden>{localize('com_a11y_selected')}</VisuallyHidden>
+        </>
       )}
     </MenuItem>
   );
diff --git a/client/src/components/Chat/Menus/Endpoints/components/SearchResults.tsx b/client/src/components/Chat/Menus/Endpoints/components/SearchResults.tsx
index e6e3ebaf47..34985639c5 100644
--- a/client/src/components/Chat/Menus/Endpoints/components/SearchResults.tsx
+++ b/client/src/components/Chat/Menus/Endpoints/components/SearchResults.tsx
@@ -1,5 +1,6 @@
 import React, { Fragment } from 'react';
-import { EarthIcon } from 'lucide-react';
+import { VisuallyHidden } from '@ariakit/react';
+import { CheckCircle2, EarthIcon } from 'lucide-react';
 import { isAgentsEndpoint, isAssistantsEndpoint } from 'librechat-data-provider';
 import type { TModelSpec } from 'librechat-data-provider';
 import type { Endpoint } from '~/common';
@@ -60,6 +61,7 @@ export function SearchResults({ results, localize, searchValue }: SearchResultsP
             <MenuItem
               key={spec.name}
               onClick={() => handleSelectSpec(spec)}
+              aria-selected={selectedSpec === spec.name || undefined}
               className={cn(
                 'flex w-full cursor-pointer justify-between rounded-lg px-2 text-sm',
                 spec.description ? 'items-start' : 'items-center',
@@ -84,23 +86,16 @@ export function SearchResults({ results, localize, searchValue }: SearchResultsP
                 </div>
               </div>
               {selectedSpec === spec.name && (
-                <div className={cn('flex-shrink-0', spec.description ? 'pt-1' : '')}>
-                  <svg
-                    width="16"
-                    height="16"
-                    viewBox="0 0 24 24"
-                    fill="none"
-                    xmlns="http://www.w3.org/2000/svg"
-                    className="block"
-                  >
-                    <path
-                      fillRule="evenodd"
-                      clipRule="evenodd"
-                      d="M2 12C2 6.47715 6.47715 2 12 2C17.5228 2 22 6.47715 22 12C22 17.5228 17.5228 22 12 22C6.47715 22 2 17.5228 2 12ZM16.0755 7.93219C16.5272 8.25003 16.6356 8.87383 16.3178 9.32549L11.5678 16.0755C11.3931 16.3237 11.1152 16.4792 10.8123 16.4981C10.5093 16.517 10.2142 16.3973 10.0101 16.1727L7.51006 13.4227C7.13855 13.014 7.16867 12.3816 7.57733 12.0101C7.98598 11.6386 8.61843 11.6687 8.98994 12.0773L10.6504 13.9039L14.6822 8.17451C15 7.72284 15.6238 7.61436 16.0755 7.93219Z"
-                      fill="currentColor"
-                    />
-                  </svg>
-                </div>
+                <>
+                  <CheckCircle2
+                    className={cn(
+                      'size-4 shrink-0 text-text-primary',
+                      spec.description ? 'mt-1' : '',
+                    )}
+                    aria-hidden="true"
+                  />
+                  <VisuallyHidden>{localize('com_a11y_selected')}</VisuallyHidden>
+                </>
               )}
             </MenuItem>
           );
@@ -164,10 +159,13 @@ export function SearchResults({ results, localize, searchValue }: SearchResultsP
                     modelName = endpoint.assistantNames[modelId];
                   }
 
+                  const isModelSelected =
+                    selectedEndpoint === endpoint.value && selectedModel === modelId;
                   return (
                     <MenuItem
                       key={`${endpoint.value}-${modelId}-search-${i}`}
                       onClick={() => handleSelectModel(endpoint, modelId)}
+                      aria-selected={isModelSelected || undefined}
                       className="flex w-full cursor-pointer items-center justify-start rounded-lg px-3 py-2 pl-6 text-sm"
                     >
                       <div className="flex items-center gap-2">
@@ -185,22 +183,14 @@ export function SearchResults({ results, localize, searchValue }: SearchResultsP
                       {isGlobal && (
                         <EarthIcon className="ml-auto size-4 text-green-400" aria-hidden="true" />
                       )}
-                      {selectedEndpoint === endpoint.value && selectedModel === modelId && (
-                        <svg
-                          width="16"
-                          height="16"
-                          viewBox="0 0 24 24"
-                          fill="none"
-                          xmlns="http://www.w3.org/2000/svg"
-                          className="block"
-                        >
-                          <path
-                            fillRule="evenodd"
-                            clipRule="evenodd"
-                            d="M2 12C2 6.47715 6.47715 2 12 2C17.5228 2 22 6.47715 22 12C22 17.5228 17.5228 22 12 22C6.47715 22 2 17.5228 2 12ZM16.0755 7.93219C16.5272 8.25003 16.6356 8.87383 16.3178 9.32549L11.5678 16.0755C11.3931 16.3237 11.1152 16.4792 10.8123 16.4981C10.5093 16.517 10.2142 16.3973 10.0101 16.1727L7.51006 13.4227C7.13855 13.014 7.16867 12.3816 7.57733 12.0101C7.98598 11.6386 8.61843 11.6687 8.98994 12.0773L10.6504 13.9039L14.6822 8.17451C15 7.72284 15.6238 7.61436 16.0755 7.93219Z"
-                            fill="currentColor"
+                      {isModelSelected && (
+                        <>
+                          <CheckCircle2
+                            className="size-4 shrink-0 text-text-primary"
+                            aria-hidden="true"
                           />
-                        </svg>
+                          <VisuallyHidden>{localize('com_a11y_selected')}</VisuallyHidden>
+                        </>
                       )}
                     </MenuItem>
                   );
@@ -209,10 +199,12 @@ export function SearchResults({ results, localize, searchValue }: SearchResultsP
             );
           } else {
             // Endpoints with no models
+            const isEndpointSelected = selectedEndpoint === endpoint.value;
             return (
               <MenuItem
                 key={`endpoint-${endpoint.value}-search-item`}
                 onClick={() => handleSelectEndpoint(endpoint)}
+                aria-selected={isEndpointSelected || undefined}
                 className="flex w-full cursor-pointer items-center justify-between rounded-xl px-3 py-2 text-sm"
               >
                 <div className="flex items-center gap-2">
@@ -226,22 +218,14 @@ export function SearchResults({ results, localize, searchValue }: SearchResultsP
                   )}
                   <span>{endpoint.label}</span>
                 </div>
-                {selectedEndpoint === endpoint.value && (
-                  <svg
-                    width="16"
-                    height="16"
-                    viewBox="0 0 24 24"
-                    fill="none"
-                    xmlns="http://www.w3.org/2000/svg"
-                    className="block"
-                  >
-                    <path
-                      fillRule="evenodd"
-                      clipRule="evenodd"
-                      d="M2 12C2 6.47715 6.47715 2 12 2C17.5228 2 22 6.47715 22 12C22 17.5228 17.5228 22 12 22C6.47715 22 2 17.5228 2 12ZM16.0755 7.93219C16.5272 8.25003 16.6356 8.87383 16.3178 9.32549L11.5678 16.0755C11.3931 16.3237 11.1152 16.4792 10.8123 16.4981C10.5093 16.517 10.2142 16.3973 10.0101 16.1727L7.51006 13.4227C7.13855 13.014 7.16867 12.3816 7.57733 12.0101C7.98598 11.6386 8.61843 11.6687 8.98994 12.0773L10.6504 13.9039L14.6822 8.17451C15 7.72284 15.6238 7.61436 16.0755 7.93219Z"
-                      fill="currentColor"
+                {isEndpointSelected && (
+                  <>
+                    <CheckCircle2
+                      className="size-4 shrink-0 text-text-primary"
+                      aria-hidden="true"
                     />
-                  </svg>
+                    <VisuallyHidden>{localize('com_a11y_selected')}</VisuallyHidden>
+                  </>
                 )}
               </MenuItem>
             );
diff --git a/client/src/components/Chat/Messages/Content/MarkdownComponents.tsx b/client/src/components/Chat/Messages/Content/MarkdownComponents.tsx
index 7db3fa668a..d647147151 100644
--- a/client/src/components/Chat/Messages/Content/MarkdownComponents.tsx
+++ b/client/src/components/Chat/Messages/Content/MarkdownComponents.tsx
@@ -111,7 +111,7 @@ export const a: React.ElementType = memo(({ href, children }: TAnchorProps) => {
   }, [user?.id, href]);
 
   const { refetch: downloadFile } = useFileDownload(user?.id ?? '', file_id);
-  const props: { target?: string; onClick?: React.MouseEventHandler } = { target: '_new' };
+  const props: { target?: string; onClick?: React.MouseEventHandler } = { target: '_blank' };
 
   if (!file_id || !filename) {
     return (
diff --git a/client/src/components/Chat/Messages/Content/MarkdownLite.tsx b/client/src/components/Chat/Messages/Content/MarkdownLite.tsx
index 65efe2f256..24980d8a90 100644
--- a/client/src/components/Chat/Messages/Content/MarkdownLite.tsx
+++ b/client/src/components/Chat/Messages/Content/MarkdownLite.tsx
@@ -38,7 +38,6 @@ const MarkdownLite = memo(
               ]}
               /** @ts-ignore */
               rehypePlugins={rehypePlugins}
-              // linkTarget="_new"
               components={
                 {
                   code: codeExecution ? code : codeNoExecution,
diff --git a/client/src/components/Chat/Messages/Content/Part.tsx b/client/src/components/Chat/Messages/Content/Part.tsx
index bfa2b28fac..f97d1343b9 100644
--- a/client/src/components/Chat/Messages/Content/Part.tsx
+++ b/client/src/components/Chat/Messages/Content/Part.tsx
@@ -67,9 +67,20 @@ const Part = memo(
       if (part.tool_call_ids != null && !text) {
         return null;
       }
-      /** Skip rendering if text is only whitespace to avoid empty Container */
-      if (!isLast && text.length > 0 && /^\s*$/.test(text)) {
-        return null;
+      /** Handle whitespace-only text to avoid layout shift */
+      if (text.length > 0 && /^\s*$/.test(text)) {
+        /** Show placeholder for whitespace-only last part during streaming */
+        if (isLast && showCursor) {
+          return (
+            <Container>
+              <EmptyText />
+            </Container>
+          );
+        }
+        /** Skip rendering non-last whitespace-only parts to avoid empty Container */
+        if (!isLast) {
+          return null;
+        }
       }
       return (
         <Container>
@@ -91,7 +102,11 @@ const Part = memo(
 
       const isToolCall =
         'args' in toolCall && (!toolCall.type || toolCall.type === ToolCallTypes.TOOL_CALL);
-      if (isToolCall && toolCall.name === Tools.execute_code) {
+      if (
+        isToolCall &&
+        (toolCall.name === Tools.execute_code ||
+          toolCall.name === Constants.PROGRAMMATIC_TOOL_CALLING)
+      ) {
         return (
           <ExecuteCode
             attachments={attachments}
diff --git a/client/src/components/Chat/Messages/Content/Parts/Attachment.tsx b/client/src/components/Chat/Messages/Content/Parts/Attachment.tsx
index 1d14534e0d..b5d1e07cbf 100644
--- a/client/src/components/Chat/Messages/Content/Parts/Attachment.tsx
+++ b/client/src/components/Chat/Messages/Content/Parts/Attachment.tsx
@@ -8,9 +8,13 @@ import { cn } from '~/utils';
 
 const FileAttachment = memo(({ attachment }: { attachment: Partial<TAttachment> }) => {
   const [isVisible, setIsVisible] = useState(false);
+  const file = attachment as TFile & TAttachmentMetadata;
   const { handleDownload } = useAttachmentLink({
     href: attachment.filepath ?? '',
     filename: attachment.filename ?? '',
+    file_id: file.file_id,
+    user: file.user,
+    source: file.source,
   });
   const extension = attachment.filename?.split('.').pop();
 
diff --git a/client/src/components/Chat/Messages/Content/Parts/ExecuteCode.tsx b/client/src/components/Chat/Messages/Content/Parts/ExecuteCode.tsx
index 729011bdbd..2f14ac0f13 100644
--- a/client/src/components/Chat/Messages/Content/Parts/ExecuteCode.tsx
+++ b/client/src/components/Chat/Messages/Content/Parts/ExecuteCode.tsx
@@ -67,7 +67,7 @@ export default function ExecuteCode({
   const [contentHeight, setContentHeight] = useState<number | undefined>(0);
 
   const prevShowCodeRef = useRef<boolean>(showCode);
-  const { lang, code } = useParseArgs(args) ?? ({} as ParsedArgs);
+  const { lang = 'py', code } = useParseArgs(args) ?? ({} as ParsedArgs);
   const progress = useProgress(initialProgress);
 
   useEffect(() => {
diff --git a/client/src/components/Chat/Messages/Content/Parts/LogContent.tsx b/client/src/components/Chat/Messages/Content/Parts/LogContent.tsx
index d2a303f49f..da2a8f175e 100644
--- a/client/src/components/Chat/Messages/Content/Parts/LogContent.tsx
+++ b/client/src/components/Chat/Messages/Content/Parts/LogContent.tsx
@@ -65,6 +65,7 @@ const LogContent: React.FC<LogContentProps> = ({ output = '', renderImages, atta
       return `${filename} ${localize('com_download_expired')}`;
     }
 
+    const fileData = file as TFile & TAttachmentMetadata;
     const filepath = file.filepath || '';
 
     // const expirationText = expiresAt
@@ -72,7 +73,13 @@ const LogContent: React.FC<LogContentProps> = ({ output = '', renderImages, atta
     //   : ` ${localize('com_click_to_download')}`;
 
     return (
-      <LogLink href={filepath} filename={filename}>
+      <LogLink
+        href={filepath}
+        filename={filename}
+        file_id={fileData.file_id}
+        user={fileData.user}
+        source={fileData.source}
+      >
         {'- '}
         {filename} {localize('com_click_to_download')}
       </LogLink>
diff --git a/client/src/components/Chat/Messages/Content/Parts/LogLink.tsx b/client/src/components/Chat/Messages/Content/Parts/LogLink.tsx
index d328f202ee..070becf517 100644
--- a/client/src/components/Chat/Messages/Content/Parts/LogLink.tsx
+++ b/client/src/components/Chat/Messages/Content/Parts/LogLink.tsx
@@ -1,21 +1,56 @@
 import React from 'react';
+import { FileSources } from 'librechat-data-provider';
 import { useToastContext } from '@librechat/client';
-import { useCodeOutputDownload } from '~/data-provider';
+import { useCodeOutputDownload, useFileDownload } from '~/data-provider';
 
 interface LogLinkProps {
   href: string;
   filename: string;
+  file_id?: string;
+  user?: string;
+  source?: string;
   children: React.ReactNode;
 }
 
-export const useAttachmentLink = ({ href, filename }: Pick<LogLinkProps, 'href' | 'filename'>) => {
+interface AttachmentLinkOptions {
+  href: string;
+  filename: string;
+  file_id?: string;
+  user?: string;
+  source?: string;
+}
+
+/**
+ * Determines if a file is stored locally (not an external API URL).
+ * Files with these sources are stored on the LibreChat server and should
+ * use the /api/files/download endpoint instead of direct URL access.
+ */
+const isLocallyStoredSource = (source?: string): boolean => {
+  if (!source) {
+    return false;
+  }
+  return [FileSources.local, FileSources.firebase, FileSources.s3, FileSources.azure_blob].includes(
+    source as FileSources,
+  );
+};
+
+export const useAttachmentLink = ({
+  href,
+  filename,
+  file_id,
+  user,
+  source,
+}: AttachmentLinkOptions) => {
   const { showToast } = useToastContext();
-  const { refetch: downloadFile } = useCodeOutputDownload(href);
+
+  const useLocalDownload = isLocallyStoredSource(source) && !!file_id && !!user;
+  const { refetch: downloadFromApi } = useFileDownload(user, file_id);
+  const { refetch: downloadFromUrl } = useCodeOutputDownload(href);
 
   const handleDownload = async (event: React.MouseEvent<HTMLAnchorElement | HTMLButtonElement>) => {
     event.preventDefault();
     try {
-      const stream = await downloadFile();
+      const stream = useLocalDownload ? await downloadFromApi() : await downloadFromUrl();
       if (stream.data == null || stream.data === '') {
         console.error('Error downloading file: No data found');
         showToast({
@@ -39,8 +74,8 @@ export const useAttachmentLink = ({ href, filename }: Pick<LogLinkProps, 'href'
   return { handleDownload };
 };
 
-const LogLink: React.FC<LogLinkProps> = ({ href, filename, children }) => {
-  const { handleDownload } = useAttachmentLink({ href, filename });
+const LogLink: React.FC<LogLinkProps> = ({ href, filename, file_id, user, source, children }) => {
+  const { handleDownload } = useAttachmentLink({ href, filename, file_id, user, source });
   return (
     <a
       href={href}
diff --git a/client/src/components/Chat/Messages/Content/ToolCall.tsx b/client/src/components/Chat/Messages/Content/ToolCall.tsx
index b9feef1bad..c807288b46 100644
--- a/client/src/components/Chat/Messages/Content/ToolCall.tsx
+++ b/client/src/components/Chat/Messages/Content/ToolCall.tsx
@@ -1,7 +1,12 @@
-import { useMemo, useState, useEffect, useRef, useLayoutEffect } from 'react';
+import { useMemo, useState, useEffect, useRef, useCallback, useLayoutEffect } from 'react';
 import { Button } from '@librechat/client';
 import { TriangleAlert } from 'lucide-react';
-import { actionDelimiter, actionDomainSeparator, Constants } from 'librechat-data-provider';
+import {
+  Constants,
+  dataService,
+  actionDelimiter,
+  actionDomainSeparator,
+} from 'librechat-data-provider';
 import type { TAttachment } from 'librechat-data-provider';
 import { useLocalize, useProgress } from '~/hooks';
 import { AttachmentGroup } from './Parts';
@@ -36,9 +41,9 @@ export default function ToolCall({
   const [isAnimating, setIsAnimating] = useState(false);
   const prevShowInfoRef = useRef<boolean>(showInfo);
 
-  const { function_name, domain, isMCPToolCall } = useMemo(() => {
+  const { function_name, domain, isMCPToolCall, mcpServerName } = useMemo(() => {
     if (typeof name !== 'string') {
-      return { function_name: '', domain: null, isMCPToolCall: false };
+      return { function_name: '', domain: null, isMCPToolCall: false, mcpServerName: '' };
     }
     if (name.includes(Constants.mcp_delimiter)) {
       const [func, server] = name.split(Constants.mcp_delimiter);
@@ -46,6 +51,7 @@ export default function ToolCall({
         function_name: func || '',
         domain: server && (server.replaceAll(actionDomainSeparator, '.') || null),
         isMCPToolCall: true,
+        mcpServerName: server || '',
       };
     }
     const [func, _domain] = name.includes(actionDelimiter)
@@ -55,9 +61,40 @@ export default function ToolCall({
       function_name: func || '',
       domain: _domain && (_domain.replaceAll(actionDomainSeparator, '.') || null),
       isMCPToolCall: false,
+      mcpServerName: '',
     };
   }, [name]);
 
+  const actionId = useMemo(() => {
+    if (isMCPToolCall || !auth) {
+      return '';
+    }
+    try {
+      const url = new URL(auth);
+      const redirectUri = url.searchParams.get('redirect_uri') || '';
+      const match = redirectUri.match(/\/api\/actions\/([^/]+)\/oauth\/callback/);
+      return match?.[1] || '';
+    } catch {
+      return '';
+    }
+  }, [auth, isMCPToolCall]);
+
+  const handleOAuthClick = useCallback(async () => {
+    if (!auth) {
+      return;
+    }
+    try {
+      if (isMCPToolCall && mcpServerName) {
+        await dataService.bindMCPOAuth(mcpServerName);
+      } else if (actionId) {
+        await dataService.bindActionOAuth(actionId);
+      }
+    } catch (e) {
+      logger.error('Failed to bind OAuth CSRF cookie', e);
+    }
+    window.open(auth, '_blank', 'noopener,noreferrer');
+  }, [auth, isMCPToolCall, mcpServerName, actionId]);
+
   const error =
     typeof output === 'string' && output.toLowerCase().includes('error processing tool');
 
@@ -230,7 +267,7 @@ export default function ToolCall({
               className="font-mediu inline-flex items-center justify-center rounded-xl px-4 py-2 text-sm"
               variant="default"
               rel="noopener noreferrer"
-              onClick={() => window.open(auth, '_blank', 'noopener,noreferrer')}
+              onClick={handleOAuthClick}
             >
               {localize('com_ui_sign_in_to_domain', { 0: authDomain })}
             </Button>
diff --git a/client/src/components/Conversations/Conversations.tsx b/client/src/components/Conversations/Conversations.tsx
index b972d251b0..fc66c0977a 100644
--- a/client/src/components/Conversations/Conversations.tsx
+++ b/client/src/components/Conversations/Conversations.tsx
@@ -82,7 +82,7 @@ const ChatsHeader: FC<ChatsHeaderProps> = memo(({ isExpanded, onToggle }) => {
   return (
     <button
       onClick={onToggle}
-      className="group flex w-full items-center justify-between px-1 py-2 text-xs font-bold text-text-secondary"
+      className="group flex w-full items-center justify-between rounded-lg px-1 py-2 text-xs font-bold text-text-secondary outline-none focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-black dark:focus-visible:ring-white"
       type="button"
     >
       <span className="select-none">{localize('com_ui_chats')}</span>
diff --git a/client/src/components/Conversations/Convo.tsx b/client/src/components/Conversations/Convo.tsx
index efdf2c48b2..108755a291 100644
--- a/client/src/components/Conversations/Convo.tsx
+++ b/client/src/components/Conversations/Convo.tsx
@@ -47,6 +47,7 @@ export default function Conversation({
   const [hasInteracted, setHasInteracted] = useState(false);
 
   const previousTitle = useRef(title);
+  const containerRef = useRef<HTMLDivElement>(null);
 
   useEffect(() => {
     if (title !== previousTitle.current) {
@@ -109,6 +110,37 @@ export default function Conversation({
     }
   }, [hasInteracted]);
 
+  const handleMouseLeave = useCallback(() => {
+    if (!isPopoverActive) {
+      setHasInteracted(false);
+    }
+  }, [isPopoverActive]);
+
+  const handleBlur = useCallback(
+    (e: React.FocusEvent<HTMLDivElement>) => {
+      // Don't reset if focus is moving to a child element within this container
+      if (e.currentTarget.contains(e.relatedTarget as Node)) {
+        return;
+      }
+      if (!isPopoverActive) {
+        setHasInteracted(false);
+      }
+    },
+    [isPopoverActive],
+  );
+
+  const handlePopoverOpenChange = useCallback((open: boolean) => {
+    setIsPopoverActive(open);
+    if (!open) {
+      requestAnimationFrame(() => {
+        const container = containerRef.current;
+        if (container && !container.contains(document.activeElement)) {
+          setHasInteracted(false);
+        }
+      });
+    }
+  }, []);
+
   const handleNavigation = (ctrlOrMetaKey: boolean) => {
     if (ctrlOrMetaKey) {
       toggleNav();
@@ -141,14 +173,15 @@ export default function Conversation({
     isActiveConvo,
     conversationId,
     isPopoverActive,
-    setIsPopoverActive,
+    setIsPopoverActive: handlePopoverOpenChange,
     isShiftHeld: isActiveConvo ? isShiftHeld : false,
   };
 
   return (
     <div
+      ref={containerRef}
       className={cn(
-        'group relative flex h-12 w-full items-center rounded-lg md:h-9',
+        'group relative flex h-12 w-full items-center rounded-lg outline-none focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-black dark:focus-visible:ring-white md:h-9',
         isActiveConvo || isPopoverActive
           ? 'bg-surface-active-alt before:absolute before:bottom-1 before:left-0 before:top-1 before:w-0.5 before:rounded-full before:bg-black dark:before:bg-white'
           : 'hover:bg-surface-active-alt',
@@ -159,7 +192,9 @@ export default function Conversation({
         title: title || localize('com_ui_untitled'),
       })}
       onMouseEnter={handleMouseEnter}
+      onMouseLeave={handleMouseLeave}
       onFocus={handleMouseEnter}
+      onBlur={handleBlur}
       onClick={(e) => {
         if (renaming) {
           return;
diff --git a/client/src/components/Conversations/ConvoLink.tsx b/client/src/components/Conversations/ConvoLink.tsx
index 9eb0764a70..543407501e 100644
--- a/client/src/components/Conversations/ConvoLink.tsx
+++ b/client/src/components/Conversations/ConvoLink.tsx
@@ -48,7 +48,7 @@ const ConvoLink: React.FC<ConvoLinkProps> = ({
       </div>
       <div
         className={cn(
-          'absolute bottom-0 right-0 top-0 w-20 rounded-r-lg bg-gradient-to-l',
+          'pointer-events-none absolute bottom-0.5 right-0.5 top-0.5 w-20 rounded-r-md bg-gradient-to-l',
           isActiveConvo || isPopoverActive
             ? 'from-surface-active-alt'
             : 'from-surface-primary-alt from-0% to-transparent group-hover:from-surface-active-alt group-hover:from-40%',
diff --git a/client/src/components/Conversations/ConvoOptions/ConvoOptions.tsx b/client/src/components/Conversations/ConvoOptions/ConvoOptions.tsx
index 14c6b424b4..25889e0e67 100644
--- a/client/src/components/Conversations/ConvoOptions/ConvoOptions.tsx
+++ b/client/src/components/Conversations/ConvoOptions/ConvoOptions.tsx
@@ -35,7 +35,7 @@ function ConvoOptions({
   retainView: () => void;
   renameHandler: (e: MouseEvent) => void;
   isPopoverActive: boolean;
-  setIsPopoverActive: React.Dispatch<React.SetStateAction<boolean>>;
+  setIsPopoverActive: (open: boolean) => void;
   isActiveConvo: boolean;
   isShiftHeld?: boolean;
 }) {
@@ -294,6 +294,7 @@ function ConvoOptions({
         portal={true}
         menuId={menuId}
         focusLoop={true}
+        className="z-[125]"
         unmountOnHide={true}
         isOpen={isPopoverActive}
         setIsOpen={setIsPopoverActive}
@@ -301,7 +302,7 @@ function ConvoOptions({
           <Ariakit.MenuButton
             id={`conversation-menu-${conversationId}`}
             aria-label={localize('com_nav_convo_menu_options')}
-            aria-readonly={undefined}
+            aria-expanded={isPopoverActive}
             className={cn(
               'inline-flex h-7 w-7 items-center justify-center gap-2 rounded-md border-none p-0 text-sm font-medium ring-ring-primary transition-all duration-200 ease-in-out focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2 disabled:opacity-50',
               isActiveConvo === true || isPopoverActive
@@ -321,7 +322,6 @@ function ConvoOptions({
           </Ariakit.MenuButton>
         }
         items={dropdownItems}
-        className="z-30"
       />
       {showShareDialog && (
         <ShareButton
diff --git a/client/src/components/Conversations/ConvoOptions/DeleteButton.tsx b/client/src/components/Conversations/ConvoOptions/DeleteButton.tsx
index 002d555455..17691b4a08 100644
--- a/client/src/components/Conversations/ConvoOptions/DeleteButton.tsx
+++ b/client/src/components/Conversations/ConvoOptions/DeleteButton.tsx
@@ -25,7 +25,7 @@ type DeleteButtonProps = {
   showDeleteDialog?: boolean;
   setShowDeleteDialog?: (value: boolean) => void;
   triggerRef?: React.RefObject<HTMLButtonElement>;
-  setMenuOpen?: React.Dispatch<React.SetStateAction<boolean>>;
+  setMenuOpen?: (open: boolean) => void;
 };
 
 export function DeleteConversationDialog({
@@ -35,7 +35,7 @@ export function DeleteConversationDialog({
   retainView,
   title,
 }: {
-  setMenuOpen?: React.Dispatch<React.SetStateAction<boolean>>;
+  setMenuOpen?: (open: boolean) => void;
   setShowDeleteDialog: (value: boolean) => void;
   conversationId: string;
   retainView: () => void;
diff --git a/client/src/components/MCP/CustomUserVarsSection.tsx b/client/src/components/MCP/CustomUserVarsSection.tsx
index 987613e24c..339b78f6b9 100644
--- a/client/src/components/MCP/CustomUserVarsSection.tsx
+++ b/client/src/components/MCP/CustomUserVarsSection.tsx
@@ -23,9 +23,10 @@ interface AuthFieldProps {
   hasValue: boolean;
   control: any;
   errors: any;
+  autoFocus?: boolean;
 }
 
-function AuthField({ name, config, hasValue, control, errors }: AuthFieldProps) {
+function AuthField({ name, config, hasValue, control, errors, autoFocus }: AuthFieldProps) {
   const localize = useLocalize();
   const statusText = hasValue ? localize('com_ui_set') : localize('com_ui_unset');
 
@@ -85,6 +86,11 @@ function AuthField({ name, config, hasValue, control, errors }: AuthFieldProps)
           <Input
             id={name}
             type="text"
+            /* autoFocus is generally disabled due to the fact that it can disorient users,
+             * but in this case, the required field would logically be immediately navigated to anyways, and the component's
+             * functionality emulates that of a new modal opening, where users would expect focus to be shifted to the new content */
+            // eslint-disable-next-line jsx-a11y/no-autofocus
+            autoFocus={autoFocus}
             {...field}
             placeholder={
               hasValue
@@ -150,7 +156,7 @@ export default function CustomUserVarsSection({
   return (
     <div className="flex-1 space-y-4">
       <form onSubmit={handleSubmit(onFormSubmit)} className="space-y-4">
-        {Object.entries(fields).map(([key, config]) => {
+        {Object.entries(fields).map(([key, config], index) => {
           const hasValue = authValuesData?.authValueFlags?.[key] || false;
 
           return (
@@ -161,6 +167,8 @@ export default function CustomUserVarsSection({
               hasValue={hasValue}
               control={control}
               errors={errors}
+              // eslint-disable-next-line jsx-a11y/no-autofocus -- See AuthField autoFocus comment for more details
+              autoFocus={index === 0}
             />
           );
         })}
diff --git a/client/src/components/MCP/MCPConfigDialog.tsx b/client/src/components/MCP/MCPConfigDialog.tsx
index a3727971e9..f1079c2799 100644
--- a/client/src/components/MCP/MCPConfigDialog.tsx
+++ b/client/src/components/MCP/MCPConfigDialog.tsx
@@ -24,6 +24,7 @@ interface MCPConfigDialogProps {
   serverName: string;
   serverStatus?: MCPServerStatus;
   conversationId?: string | null;
+  storageContextKey?: string;
 }
 
 export default function MCPConfigDialog({
@@ -36,6 +37,7 @@ export default function MCPConfigDialog({
   serverName,
   serverStatus,
   conversationId,
+  storageContextKey,
 }: MCPConfigDialogProps) {
   const localize = useLocalize();
 
@@ -167,6 +169,7 @@ export default function MCPConfigDialog({
         <ServerInitializationSection
           serverName={serverName}
           conversationId={conversationId}
+          storageContextKey={storageContextKey}
           requiresOAuth={serverStatus?.requiresOAuth || false}
           hasCustomUserVars={fieldsSchema && Object.keys(fieldsSchema).length > 0}
         />
diff --git a/client/src/components/MCP/ServerInitializationSection.tsx b/client/src/components/MCP/ServerInitializationSection.tsx
index b5f71335d7..c080866b3d 100644
--- a/client/src/components/MCP/ServerInitializationSection.tsx
+++ b/client/src/components/MCP/ServerInitializationSection.tsx
@@ -9,12 +9,14 @@ interface ServerInitializationSectionProps {
   requiresOAuth: boolean;
   hasCustomUserVars?: boolean;
   conversationId?: string | null;
+  storageContextKey?: string;
 }
 
 export default function ServerInitializationSection({
   serverName,
   requiresOAuth,
   conversationId,
+  storageContextKey,
   sidePanel = false,
   hasCustomUserVars = false,
 }: ServerInitializationSectionProps) {
@@ -28,7 +30,7 @@ export default function ServerInitializationSection({
     initializeServer,
     availableMCPServers,
     revokeOAuthForServer,
-  } = useMCPServerManager({ conversationId });
+  } = useMCPServerManager({ conversationId, storageContextKey });
 
   const { connectionStatus } = useMCPConnectionStatus({
     enabled: !!availableMCPServers && availableMCPServers.length > 0,
diff --git a/client/src/components/Nav/AccountSettings.tsx b/client/src/components/Nav/AccountSettings.tsx
index d166aaaaee..e3f97160eb 100644
--- a/client/src/components/Nav/AccountSettings.tsx
+++ b/client/src/components/Nav/AccountSettings.tsx
@@ -40,7 +40,7 @@ function AccountSettings() {
         </div>
       </Select.Select>
       <Select.SelectPopover
-        className="popover-ui w-[305px] rounded-lg md:w-[244px]"
+        className="account-settings-popover popover-ui z-[125] w-[305px] rounded-lg md:w-[244px]"
         style={{
           transformOrigin: 'bottom',
           translate: '0 -4px',
diff --git a/client/src/components/Nav/Bookmarks/BookmarkNav.tsx b/client/src/components/Nav/Bookmarks/BookmarkNav.tsx
index 2be884337d..ea12fafe5b 100644
--- a/client/src/components/Nav/Bookmarks/BookmarkNav.tsx
+++ b/client/src/components/Nav/Bookmarks/BookmarkNav.tsx
@@ -25,6 +25,13 @@ const BookmarkNav: FC<BookmarkNavProps> = ({ tags, setTags }: BookmarkNavProps)
     [tags, localize],
   );
 
+  const buttonAriaLabel = useMemo(() => {
+    if (tags.length === 0) {
+      return localize('com_ui_bookmarks');
+    }
+    return localize('com_ui_bookmarks_count_selected', { count: tags.length });
+  }, [tags.length, localize]);
+
   const bookmarks = useMemo(() => data?.filter((tag) => tag.count > 0) ?? [], [data]);
 
   const handleTagClick = useCallback(
@@ -73,6 +80,7 @@ const BookmarkNav: FC<BookmarkNavProps> = ({ tags, setTags }: BookmarkNavProps)
             <BookmarkIcon className="size-4" />
           ),
           onClick: () => handleTagClick(bookmark.tag),
+          ariaChecked: isSelected,
         });
       }
     }
@@ -89,17 +97,20 @@ const BookmarkNav: FC<BookmarkNavProps> = ({ tags, setTags }: BookmarkNavProps)
       unmountOnHide={true}
       setIsOpen={setIsMenuOpen}
       keyPrefix="bookmark-nav-"
+      className="z-[125]"
       trigger={
         <TooltipAnchor
           description={label}
           render={
             <Ariakit.MenuButton
               id="bookmark-nav-menu-button"
-              aria-label={localize('com_ui_bookmarks')}
+              aria-label={buttonAriaLabel}
+              aria-pressed={tags.length > 0}
               className={cn(
                 'flex items-center justify-center',
                 'size-10 border-none text-text-primary hover:bg-accent hover:text-accent-foreground',
                 'rounded-full border-none p-2 hover:bg-surface-active-alt md:rounded-xl',
+                'outline-none focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-black dark:focus-visible:ring-white',
                 isMenuOpen ? 'bg-surface-hover' : '',
               )}
               data-testid="bookmark-menu"
diff --git a/client/src/components/Nav/Favorites/FavoriteItem.tsx b/client/src/components/Nav/Favorites/FavoriteItem.tsx
index e758b8cd5d..173be27d00 100644
--- a/client/src/components/Nav/Favorites/FavoriteItem.tsx
+++ b/client/src/components/Nav/Favorites/FavoriteItem.tsx
@@ -110,7 +110,7 @@ export default function FavoriteItem({
       tabIndex={0}
       aria-label={ariaLabel}
       className={cn(
-        'group relative flex w-full cursor-pointer items-center justify-between rounded-lg px-3 py-2 text-sm text-text-primary hover:bg-surface-active-alt',
+        'group relative flex w-full cursor-pointer items-center justify-between rounded-lg px-3 py-2 text-sm text-text-primary outline-none hover:bg-surface-active-alt focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-black dark:focus-visible:ring-white',
         isPopoverActive ? 'bg-surface-active-alt' : '',
       )}
       onClick={handleClick}
@@ -136,6 +136,7 @@ export default function FavoriteItem({
           mountByState={true}
           isOpen={isPopoverActive}
           setIsOpen={setIsPopoverActive}
+          className="z-[125]"
           trigger={
             <Menu.MenuButton
               className={cn(
diff --git a/client/src/components/Nav/Favorites/FavoritesList.tsx b/client/src/components/Nav/Favorites/FavoritesList.tsx
index 84c0283602..86fe4a793f 100644
--- a/client/src/components/Nav/Favorites/FavoritesList.tsx
+++ b/client/src/components/Nav/Favorites/FavoritesList.tsx
@@ -9,6 +9,7 @@ import { QueryKeys, dataService } from 'librechat-data-provider';
 import type t from 'librechat-data-provider';
 import { useFavorites, useLocalize, useShowMarketplace, useNewConvo } from '~/hooks';
 import { useAssistantsMapContext, useAgentsMapContext } from '~/Providers';
+import type { AgentQueryResult } from '~/common';
 import useSelectMention from '~/hooks/Input/useSelectMention';
 import { useGetEndpointsQuery } from '~/data-provider';
 import FavoriteItem from './FavoriteItem';
@@ -184,7 +185,20 @@ export default function FavoritesList({
   const missingAgentQueries = useQueries({
     queries: missingAgentIds.map((agentId) => ({
       queryKey: [QueryKeys.agent, agentId],
-      queryFn: () => dataService.getAgentById({ agent_id: agentId }),
+      queryFn: async (): Promise<AgentQueryResult> => {
+        try {
+          const agent = await dataService.getAgentById({ agent_id: agentId });
+          return { found: true, agent };
+        } catch (error) {
+          if (error && typeof error === 'object' && 'response' in error) {
+            const axiosError = error as { response?: { status?: number } };
+            if (axiosError.response?.status === 404) {
+              return { found: false };
+            }
+          }
+          throw error;
+        }
+      },
       staleTime: 1000 * 60 * 5,
       enabled: missingAgentIds.length > 0,
     })),
@@ -201,8 +215,8 @@ export default function FavoritesList({
       }
     }
     missingAgentQueries.forEach((query) => {
-      if (query.data) {
-        combined[query.data.id] = query.data;
+      if (query.data?.found) {
+        combined[query.data.agent.id] = query.data.agent;
       }
     });
     return combined;
@@ -282,7 +296,7 @@ export default function FavoritesList({
                 role="button"
                 tabIndex={0}
                 aria-label={localize('com_agents_marketplace')}
-                className="group relative flex w-full cursor-pointer items-center justify-between rounded-lg px-3 py-2 text-sm text-text-primary hover:bg-surface-active-alt"
+                className="group relative flex w-full cursor-pointer items-center justify-between rounded-lg px-3 py-2 text-sm text-text-primary outline-none hover:bg-surface-active-alt focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-black dark:focus-visible:ring-white"
                 onClick={handleAgentMarketplace}
                 onKeyDown={(e) => {
                   if (e.key === 'Enter' || e.key === ' ') {
diff --git a/client/src/components/Nav/Favorites/tests/FavoritesList.spec.tsx b/client/src/components/Nav/Favorites/tests/FavoritesList.spec.tsx
new file mode 100644
index 0000000000..8318b94698
--- /dev/null
+++ b/client/src/components/Nav/Favorites/tests/FavoritesList.spec.tsx
@@ -0,0 +1,191 @@
+import React from 'react';
+import { render, waitFor } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { RecoilRoot } from 'recoil';
+import { DndProvider } from 'react-dnd';
+import { HTML5Backend } from 'react-dnd-html5-backend';
+import { BrowserRouter } from 'react-router-dom';
+import { dataService } from 'librechat-data-provider';
+import type t from 'librechat-data-provider';
+
+// Mock store before importing FavoritesList
+jest.mock('~/store', () => {
+  const { atom } = jest.requireActual('recoil');
+  return {
+    __esModule: true,
+    default: {
+      search: atom({
+        key: 'mock-search-atom',
+        default: { query: '' },
+      }),
+      conversationByIndex: (index: number) =>
+        atom({
+          key: `mock-conversation-atom-${index}`,
+          default: null,
+        }),
+    },
+  };
+});
+import FavoritesList from '../FavoritesList';
+
+type FavoriteItem = {
+  agentId?: string;
+  model?: string;
+  endpoint?: string;
+};
+
+// Mock dataService
+jest.mock('librechat-data-provider', () => ({
+  ...jest.requireActual('librechat-data-provider'),
+  dataService: {
+    getAgentById: jest.fn(),
+  },
+}));
+
+// Mock hooks
+const mockFavorites: FavoriteItem[] = [];
+const mockUseFavorites = jest.fn(() => ({
+  favorites: mockFavorites,
+  reorderFavorites: jest.fn(),
+  isLoading: false,
+}));
+
+jest.mock('~/hooks', () => ({
+  useFavorites: () => mockUseFavorites(),
+  useLocalize: () => (key: string) => key,
+  useShowMarketplace: () => false,
+  useNewConvo: () => ({ newConversation: jest.fn() }),
+}));
+
+jest.mock('~/Providers', () => ({
+  useAssistantsMapContext: () => ({}),
+  useAgentsMapContext: () => ({}),
+}));
+
+jest.mock('~/hooks/Input/useSelectMention', () => () => ({
+  onSelectEndpoint: jest.fn(),
+}));
+
+jest.mock('~/data-provider', () => ({
+  useGetEndpointsQuery: () => ({ data: {} }),
+}));
+
+jest.mock('../FavoriteItem', () => ({
+  __esModule: true,
+  default: ({ item, type }: { item: any; type: string }) => (
+    <div data-testid="favorite-item" data-type={type}>
+      {type === 'agent' ? item.name : item.model}
+    </div>
+  ),
+}));
+
+const createTestQueryClient = () =>
+  new QueryClient({
+    defaultOptions: {
+      queries: {
+        retry: false,
+      },
+    },
+  });
+
+const renderWithProviders = (ui: React.ReactElement) => {
+  const queryClient = createTestQueryClient();
+  return render(
+    <QueryClientProvider client={queryClient}>
+      <RecoilRoot>
+        <BrowserRouter>
+          <DndProvider backend={HTML5Backend}>{ui}</DndProvider>
+        </BrowserRouter>
+      </RecoilRoot>
+    </QueryClientProvider>,
+  );
+};
+
+describe('FavoritesList', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    mockFavorites.length = 0;
+  });
+
+  describe('rendering', () => {
+    it('should render nothing when favorites is empty and marketplace is hidden', () => {
+      const { container } = renderWithProviders(<FavoritesList />);
+      expect(container.firstChild).toBeNull();
+    });
+
+    it('should render skeleton while loading', () => {
+      mockUseFavorites.mockReturnValueOnce({
+        favorites: [],
+        reorderFavorites: jest.fn(),
+        isLoading: true,
+      });
+
+      const { container } = renderWithProviders(<FavoritesList />);
+      // Skeletons should be present during loading - container should have children
+      expect(container.firstChild).not.toBeNull();
+      // When loading, the component renders skeleton placeholders (check for content, not specific CSS)
+      expect(container.innerHTML).toContain('div');
+    });
+  });
+
+  describe('missing agent handling', () => {
+    it('should exclude missing agents (404) from rendered favorites and render valid agents', async () => {
+      const validAgent: t.Agent = {
+        id: 'valid-agent',
+        name: 'Valid Agent',
+        author: 'test-author',
+      } as t.Agent;
+
+      // Set up favorites with both valid and missing agent
+      mockFavorites.push({ agentId: 'valid-agent' }, { agentId: 'deleted-agent' });
+
+      // Mock getAgentById: valid-agent returns successfully, deleted-agent returns 404
+      (dataService.getAgentById as jest.Mock).mockImplementation(
+        ({ agent_id }: { agent_id: string }) => {
+          if (agent_id === 'valid-agent') {
+            return Promise.resolve(validAgent);
+          }
+          if (agent_id === 'deleted-agent') {
+            return Promise.reject({ response: { status: 404 } });
+          }
+          return Promise.reject(new Error('Unknown agent'));
+        },
+      );
+
+      const { findAllByTestId } = renderWithProviders(<FavoritesList />);
+
+      // Wait for queries to resolve
+      const favoriteItems = await findAllByTestId('favorite-item');
+
+      // Only the valid agent should be rendered
+      expect(favoriteItems).toHaveLength(1);
+      expect(favoriteItems[0]).toHaveTextContent('Valid Agent');
+
+      // The deleted agent should still be requested, but not rendered
+      expect(dataService.getAgentById as jest.Mock).toHaveBeenCalledWith({
+        agent_id: 'deleted-agent',
+      });
+    });
+
+    it('should not show infinite loading skeleton when agents return 404', async () => {
+      // Set up favorites with only a deleted agent
+      mockFavorites.push({ agentId: 'deleted-agent' });
+
+      // Mock getAgentById to return 404
+      (dataService.getAgentById as jest.Mock).mockRejectedValue({ response: { status: 404 } });
+
+      const { queryAllByTestId } = renderWithProviders(<FavoritesList />);
+
+      // Wait for the loading state to resolve after 404 handling by ensuring the agent request was made
+      await waitFor(() => {
+        expect(dataService.getAgentById as jest.Mock).toHaveBeenCalledWith({
+          agent_id: 'deleted-agent',
+        });
+      });
+
+      // No favorite items should be rendered (deleted agent is filtered out)
+      expect(queryAllByTestId('favorite-item')).toHaveLength(0);
+    });
+  });
+});
diff --git a/client/src/components/Nav/Nav.tsx b/client/src/components/Nav/Nav.tsx
index 381f70dc20..74883b94f4 100644
--- a/client/src/components/Nav/Nav.tsx
+++ b/client/src/components/Nav/Nav.tsx
@@ -262,7 +262,7 @@ const Nav = memo(
           <div
             data-testid="nav"
             className={cn(
-              'nav fixed left-0 top-0 z-[70] h-full bg-surface-primary-alt',
+              'nav fixed left-0 top-0 z-[110] h-full bg-surface-primary-alt',
               navVisible && 'active',
             )}
             style={{
diff --git a/client/src/components/Nav/NewChat.tsx b/client/src/components/Nav/NewChat.tsx
index 1dc92c095f..4f4f64c44f 100644
--- a/client/src/components/Nav/NewChat.tsx
+++ b/client/src/components/Nav/NewChat.tsx
@@ -55,7 +55,7 @@ export default function NewChat({
 
   return (
     <>
-      <div className="flex items-center justify-between py-[2px] md:py-2">
+      <div className="flex items-center justify-between px-0.5 py-[2px] md:py-2">
         <TooltipAnchor
           description={localize('com_nav_close_sidebar')}
           render={
@@ -66,7 +66,7 @@ export default function NewChat({
               data-testid="close-sidebar-button"
               aria-label={localize('com_nav_close_sidebar')}
               aria-expanded={true}
-              className="rounded-full border-none bg-transparent duration-0 hover:bg-surface-active-alt md:rounded-xl"
+              className="rounded-full border-none bg-transparent duration-0 hover:bg-surface-active-alt focus-visible:ring-inset focus-visible:ring-black focus-visible:ring-offset-0 dark:focus-visible:ring-white md:rounded-xl"
               onClick={handleToggleNav}
             >
               <Sidebar aria-hidden="true" className="max-md:hidden" />
@@ -88,7 +88,7 @@ export default function NewChat({
                 variant="outline"
                 data-testid="nav-new-chat-button"
                 aria-label={localize('com_ui_new_chat')}
-                className="rounded-full border-none bg-transparent duration-0 hover:bg-surface-active-alt md:rounded-xl"
+                className="rounded-full border-none bg-transparent duration-0 hover:bg-surface-active-alt focus-visible:ring-inset focus-visible:ring-black focus-visible:ring-offset-0 dark:focus-visible:ring-white md:rounded-xl"
                 onClick={clickHandler}
               >
                 <NewChatIcon className="icon-lg text-text-primary" />
diff --git a/client/src/components/Nav/SettingsTabs/Data/AgentApiKeys.tsx b/client/src/components/Nav/SettingsTabs/Data/AgentApiKeys.tsx
new file mode 100644
index 0000000000..f75b93526a
--- /dev/null
+++ b/client/src/components/Nav/SettingsTabs/Data/AgentApiKeys.tsx
@@ -0,0 +1,362 @@
+import React, { useState } from 'react';
+import {
+  useGetAgentApiKeysQuery,
+  useCreateAgentApiKeyMutation,
+  useDeleteAgentApiKeyMutation,
+} from 'librechat-data-provider/react-query';
+import { Permissions, PermissionTypes } from 'librechat-data-provider';
+import { Plus, Trash2, Copy, CopyCheck, Key, Eye, EyeOff, ShieldEllipsis } from 'lucide-react';
+import {
+  Button,
+  Input,
+  Label,
+  Spinner,
+  OGDialog,
+  OGDialogClose,
+  OGDialogTitle,
+  OGDialogHeader,
+  OGDialogContent,
+  OGDialogTrigger,
+  useToastContext,
+} from '@librechat/client';
+import type { PermissionConfig } from '~/components/ui';
+import { useUpdateRemoteAgentsPermissionsMutation } from '~/data-provider';
+import { useLocalize, useCopyToClipboard } from '~/hooks';
+import { AdminSettingsDialog } from '~/components/ui';
+
+function CreateKeyDialog({ onKeyCreated }: { onKeyCreated?: () => void }) {
+  const localize = useLocalize();
+  const { showToast } = useToastContext();
+  const [open, setOpen] = useState(false);
+  const [name, setName] = useState('');
+  const [newKey, setNewKey] = useState<string | null>(null);
+  const [showKey, setShowKey] = useState(false);
+  const [isCopying, setIsCopying] = useState(false);
+  const createMutation = useCreateAgentApiKeyMutation();
+  const copyKey = useCopyToClipboard({ text: newKey || '' });
+
+  const handleCreate = async () => {
+    if (!name.trim()) {
+      showToast({ message: localize('com_ui_api_key_name_required'), status: 'error' });
+      return;
+    }
+
+    try {
+      const result = await createMutation.mutateAsync({ name: name.trim() });
+      setNewKey(result.key);
+      showToast({ message: localize('com_ui_api_key_created'), status: 'success' });
+      onKeyCreated?.();
+    } catch {
+      showToast({ message: localize('com_ui_api_key_create_error'), status: 'error' });
+    }
+  };
+
+  const handleClose = () => {
+    setName('');
+    setNewKey(null);
+    setShowKey(false);
+    setOpen(false);
+  };
+
+  const handleCopy = () => {
+    if (isCopying) {
+      return;
+    }
+    copyKey(setIsCopying);
+    showToast({ message: localize('com_ui_api_key_copied'), status: 'success' });
+  };
+
+  return (
+    <OGDialog open={open} onOpenChange={setOpen}>
+      <OGDialogTrigger asChild>
+        <Button variant="outline" size="sm" className="gap-2">
+          <Plus className="h-4 w-4" />
+          {localize('com_ui_create_api_key')}
+        </Button>
+      </OGDialogTrigger>
+      <OGDialogContent className="max-w-md">
+        <OGDialogTitle>{localize('com_ui_create_api_key')}</OGDialogTitle>
+        <div className="space-y-4 py-4">
+          {!newKey ? (
+            <>
+              <div className="space-y-2">
+                <Label htmlFor="key-name">{localize('com_ui_api_key_name')}</Label>
+                <Input
+                  id="key-name"
+                  value={name}
+                  onChange={(e) => setName(e.target.value)}
+                  placeholder={localize('com_ui_api_key_name_placeholder')}
+                />
+              </div>
+              <div className="flex justify-end gap-2">
+                <OGDialogClose asChild>
+                  <Button variant="outline" onClick={handleClose}>
+                    {localize('com_ui_cancel')}
+                  </Button>
+                </OGDialogClose>
+                <Button onClick={handleCreate} disabled={createMutation.isLoading}>
+                  {createMutation.isLoading ? (
+                    <Spinner className="h-4 w-4" />
+                  ) : (
+                    localize('com_ui_create')
+                  )}
+                </Button>
+              </div>
+            </>
+          ) : (
+            <>
+              <div className="rounded-lg border border-yellow-500/50 bg-yellow-50 p-4 dark:bg-yellow-900/20">
+                <p className="text-sm text-yellow-800 dark:text-yellow-200">
+                  {localize('com_ui_api_key_warning')}
+                </p>
+              </div>
+              <div className="space-y-2">
+                <Label>{localize('com_ui_your_api_key')}</Label>
+                <div className="flex gap-2">
+                  <Input
+                    value={showKey ? newKey : '•'.repeat(newKey.length)}
+                    readOnly
+                    className="font-mono text-sm"
+                  />
+                  <Button
+                    variant="outline"
+                    size="icon"
+                    onClick={() => setShowKey(!showKey)}
+                    title={showKey ? localize('com_ui_hide') : localize('com_ui_show')}
+                  >
+                    {showKey ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
+                  </Button>
+                  <Button
+                    variant="outline"
+                    size="icon"
+                    onClick={handleCopy}
+                    disabled={isCopying}
+                    title={localize('com_ui_copy')}
+                  >
+                    {isCopying ? <CopyCheck className="h-4 w-4" /> : <Copy className="h-4 w-4" />}
+                  </Button>
+                </div>
+              </div>
+              <div className="flex justify-end">
+                <Button onClick={handleClose}>{localize('com_ui_done')}</Button>
+              </div>
+            </>
+          )}
+        </div>
+      </OGDialogContent>
+    </OGDialog>
+  );
+}
+
+function KeyItem({
+  id,
+  name,
+  keyPrefix,
+  createdAt,
+  lastUsedAt,
+}: {
+  id: string;
+  name: string;
+  keyPrefix: string;
+  createdAt: string;
+  lastUsedAt?: string;
+}) {
+  const localize = useLocalize();
+  const { showToast } = useToastContext();
+  const [confirmDelete, setConfirmDelete] = useState(false);
+  const deleteMutation = useDeleteAgentApiKeyMutation();
+
+  const handleDelete = async () => {
+    try {
+      await deleteMutation.mutateAsync(id);
+      showToast({ message: localize('com_ui_api_key_deleted'), status: 'success' });
+    } catch {
+      showToast({ message: localize('com_ui_api_key_delete_error'), status: 'error' });
+    }
+    setConfirmDelete(false);
+  };
+
+  const formatDate = (dateStr: string) => {
+    return new Date(dateStr).toLocaleDateString(undefined, {
+      year: 'numeric',
+      month: 'short',
+      day: 'numeric',
+    });
+  };
+
+  return (
+    <div className="flex items-center justify-between rounded-lg border border-border-light p-3">
+      <div className="flex items-center gap-3">
+        <Key className="h-5 w-5 text-text-secondary" />
+        <div>
+          <div className="font-medium">{name}</div>
+          <div className="text-sm text-text-secondary">
+            <span className="font-mono">{keyPrefix}...</span>
+            <span className="mx-2">•</span>
+            <span>
+              {localize('com_ui_created')} {formatDate(createdAt)}
+            </span>
+            {lastUsedAt && (
+              <>
+                <span className="mx-2">•</span>
+                <span>
+                  {localize('com_ui_last_used')} {formatDate(lastUsedAt)}
+                </span>
+              </>
+            )}
+          </div>
+        </div>
+      </div>
+      <div>
+        {confirmDelete ? (
+          <div className="flex gap-2">
+            <Button variant="outline" size="sm" onClick={() => setConfirmDelete(false)}>
+              {localize('com_ui_cancel')}
+            </Button>
+            <Button
+              variant="destructive"
+              size="sm"
+              onClick={handleDelete}
+              disabled={deleteMutation.isLoading}
+            >
+              {deleteMutation.isLoading ? (
+                <Spinner className="h-4 w-4" />
+              ) : (
+                localize('com_ui_delete')
+              )}
+            </Button>
+          </div>
+        ) : (
+          <Button
+            variant="ghost"
+            size="icon"
+            onClick={() => setConfirmDelete(true)}
+            title={localize('com_ui_delete')}
+          >
+            <Trash2 className="h-4 w-4 text-text-secondary hover:text-red-500" />
+          </Button>
+        )}
+      </div>
+    </div>
+  );
+}
+
+function ApiKeysContent({ isOpen }: { isOpen: boolean }) {
+  const localize = useLocalize();
+  const { data, isLoading, error } = useGetAgentApiKeysQuery({ enabled: isOpen });
+
+  if (error) {
+    return <div className="text-sm text-red-500">{localize('com_ui_api_keys_load_error')}</div>;
+  }
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-end gap-2">
+        <RemoteAgentsAdminSettings />
+        <CreateKeyDialog />
+      </div>
+
+      <div className="max-h-[400px] space-y-2 overflow-y-auto">
+        {isLoading && (
+          <div className="flex items-center justify-center py-8">
+            <Spinner className="h-6 w-6" />
+          </div>
+        )}
+        {!isLoading &&
+          data?.keys &&
+          data.keys.length > 0 &&
+          data.keys.map((key) => (
+            <KeyItem
+              key={key.id}
+              id={key.id}
+              name={key.name}
+              keyPrefix={key.keyPrefix}
+              createdAt={key.createdAt}
+              lastUsedAt={key.lastUsedAt}
+            />
+          ))}
+        {!isLoading && (!data?.keys || data.keys.length === 0) && (
+          <div className="rounded-lg border-2 border-dashed border-border-light p-8 text-center">
+            <Key className="mx-auto h-8 w-8 text-text-secondary" />
+            <p className="mt-2 text-sm text-text-secondary">{localize('com_ui_no_api_keys')}</p>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+const remoteAgentsPermissions: PermissionConfig[] = [
+  { permission: Permissions.USE, labelKey: 'com_ui_remote_agents_allow_use' },
+  { permission: Permissions.CREATE, labelKey: 'com_ui_remote_agents_allow_create' },
+  { permission: Permissions.SHARE, labelKey: 'com_ui_remote_agents_allow_share' },
+  { permission: Permissions.SHARE_PUBLIC, labelKey: 'com_ui_remote_agents_allow_share_public' },
+];
+
+function RemoteAgentsAdminSettings() {
+  const localize = useLocalize();
+  const { showToast } = useToastContext();
+
+  const mutation = useUpdateRemoteAgentsPermissionsMutation({
+    onSuccess: () => {
+      showToast({ status: 'success', message: localize('com_ui_saved') });
+    },
+    onError: () => {
+      showToast({ status: 'error', message: localize('com_ui_error_save_admin_settings') });
+    },
+  });
+
+  const trigger = (
+    <Button
+      variant="ghost"
+      size="icon"
+      className="h-8 w-8"
+      aria-label={localize('com_ui_admin_settings')}
+    >
+      <ShieldEllipsis className="h-5 w-5" aria-hidden="true" />
+    </Button>
+  );
+
+  return (
+    <AdminSettingsDialog
+      permissionType={PermissionTypes.REMOTE_AGENTS}
+      sectionKey="com_ui_remote_agents"
+      permissions={remoteAgentsPermissions}
+      menuId="remote-agents-role-dropdown"
+      mutation={mutation}
+      trigger={trigger}
+    />
+  );
+}
+
+export function AgentApiKeys() {
+  const localize = useLocalize();
+  const [isOpen, setIsOpen] = useState(false);
+
+  return (
+    <div className="flex items-center justify-between">
+      <Label id="api-keys-label">{localize('com_ui_agent_api_keys')}</Label>
+
+      <OGDialog open={isOpen} onOpenChange={setIsOpen}>
+        <OGDialogTrigger asChild>
+          <Button aria-labelledby="api-keys-label" variant="outline">
+            {localize('com_ui_manage')}
+          </Button>
+        </OGDialogTrigger>
+
+        <OGDialogContent
+          title={localize('com_ui_agent_api_keys')}
+          className="w-11/12 max-w-2xl bg-background text-text-primary shadow-2xl"
+        >
+          <OGDialogHeader>
+            <OGDialogTitle>{localize('com_ui_agent_api_keys')}</OGDialogTitle>
+            <p className="text-sm text-text-secondary">
+              {localize('com_ui_agent_api_keys_description')}
+            </p>
+          </OGDialogHeader>
+          <ApiKeysContent isOpen={isOpen} />
+        </OGDialogContent>
+      </OGDialog>
+    </div>
+  );
+}
diff --git a/client/src/components/Nav/SettingsTabs/Data/Data.tsx b/client/src/components/Nav/SettingsTabs/Data/Data.tsx
index 0bba5a152e..eb8cea98c2 100644
--- a/client/src/components/Nav/SettingsTabs/Data/Data.tsx
+++ b/client/src/components/Nav/SettingsTabs/Data/Data.tsx
@@ -1,15 +1,22 @@
 import React, { useState, useRef } from 'react';
 import { useOnClickOutside } from '@librechat/client';
+import { Permissions, PermissionTypes } from 'librechat-data-provider';
 import ImportConversations from './ImportConversations';
-import { RevokeKeys } from './RevokeKeys';
+import { AgentApiKeys } from './AgentApiKeys';
 import { DeleteCache } from './DeleteCache';
+import { RevokeKeys } from './RevokeKeys';
 import { ClearChats } from './ClearChats';
 import SharedLinks from './SharedLinks';
+import { useHasAccess } from '~/hooks';
 
 function Data() {
   const dataTabRef = useRef(null);
   const [confirmClearConvos, setConfirmClearConvos] = useState(false);
   useOnClickOutside(dataTabRef, () => confirmClearConvos && setConfirmClearConvos(false), []);
+  const hasAccessToApiKeys = useHasAccess({
+    permissionType: PermissionTypes.REMOTE_AGENTS,
+    permission: Permissions.USE,
+  });
 
   return (
     <div className="flex flex-col gap-3 p-1 text-sm text-text-primary">
@@ -19,6 +26,11 @@ function Data() {
       <div className="pb-3">
         <SharedLinks />
       </div>
+      {hasAccessToApiKeys && (
+        <div className="pb-3">
+          <AgentApiKeys />
+        </div>
+      )}
       <div className="pb-3">
         <RevokeKeys />
       </div>
diff --git a/client/src/components/Nav/SettingsTabs/Data/SharedLinks.tsx b/client/src/components/Nav/SettingsTabs/Data/SharedLinks.tsx
index eee7414bc2..af1803adf7 100644
--- a/client/src/components/Nav/SettingsTabs/Data/SharedLinks.tsx
+++ b/client/src/components/Nav/SettingsTabs/Data/SharedLinks.tsx
@@ -4,33 +4,33 @@ import debounce from 'lodash/debounce';
 import { useRecoilValue } from 'recoil';
 import { Link } from 'react-router-dom';
 import {
-  TrashIcon,
-  MessageSquare,
-  ArrowUpDown,
   ArrowUp,
+  TrashIcon,
   ArrowDown,
+  ArrowUpDown,
   ExternalLink,
+  MessageSquare,
 } from 'lucide-react';
-import type { SharedLinkItem, SharedLinksListParams } from 'librechat-data-provider';
-import type { TranslationKeys } from '~/hooks';
 import {
+  Label,
+  Button,
+  Spinner,
   OGDialog,
-  useToastContext,
-  OGDialogTemplate,
-  OGDialogTrigger,
-  OGDialogContent,
+  DataTable,
   useMediaQuery,
-  OGDialogHeader,
   OGDialogTitle,
   TooltipAnchor,
-  DataTable,
-  Spinner,
-  Button,
-  Label,
+  OGDialogHeader,
+  OGDialogTrigger,
+  OGDialogContent,
+  useToastContext,
+  OGDialogTemplate,
 } from '@librechat/client';
+import type { SharedLinkItem, SharedLinksListParams } from 'librechat-data-provider';
+import type { TranslationKeys } from '~/hooks';
 import { useDeleteSharedLinkMutation, useSharedLinksQuery } from '~/data-provider';
-import { useLocalize } from '~/hooks';
 import { NotificationSeverity } from '~/common';
+import { useLocalize } from '~/hooks';
 import { formatDate } from '~/utils';
 import store from '~/store';
 
@@ -47,12 +47,12 @@ const DEFAULT_PARAMS: SharedLinksListParams = {
 export default function SharedLinks() {
   const localize = useLocalize();
   const { showToast } = useToastContext();
-  const isSmallScreen = useMediaQuery('(max-width: 768px)');
-  const isSearchEnabled = useRecoilValue(store.search);
-  const [queryParams, setQueryParams] = useState<SharedLinksListParams>(DEFAULT_PARAMS);
-  const [deleteRow, setDeleteRow] = useState<SharedLinkItem | null>(null);
-  const [isDeleteOpen, setIsDeleteOpen] = useState(false);
   const [isOpen, setIsOpen] = useState(false);
+  const searchStore = useRecoilValue(store.search);
+  const [isDeleteOpen, setIsDeleteOpen] = useState(false);
+  const isSmallScreen = useMediaQuery('(max-width: 768px)');
+  const [deleteRow, setDeleteRow] = useState<SharedLinkItem | null>(null);
+  const [queryParams, setQueryParams] = useState<SharedLinksListParams>(DEFAULT_PARAMS);
 
   const { data, fetchNextPage, hasNextPage, isFetchingNextPage, refetch, isLoading } =
     useSharedLinksQuery(queryParams, {
@@ -173,17 +173,23 @@ export default function SharedLinks() {
             ariaSort = 'ascending';
           }
           return (
-            <Button
-              variant="ghost"
-              onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
-              className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
-              aria-sort={ariaSort}
-              aria-label={localize('com_ui_name_sort')}
-              aria-current={sortState ? 'true' : 'false'}
-            >
-              {localize('com_ui_name')}
-              <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
-            </Button>
+            <TooltipAnchor
+              description={localize('com_ui_name_sort')}
+              side="top"
+              render={
+                <Button
+                  variant="ghost"
+                  onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
+                  className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
+                  aria-sort={ariaSort}
+                  aria-label={localize('com_ui_name_sort')}
+                  aria-current={sortState ? 'true' : 'false'}
+                >
+                  {localize('com_ui_name')}
+                  <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
+                </Button>
+              }
+            />
           );
         },
         cell: ({ row }) => {
@@ -207,7 +213,7 @@ export default function SharedLinks() {
           );
         },
         meta: {
-          size: '35%',
+          size: '32%',
           mobileSize: '50%',
         },
       },
@@ -225,17 +231,23 @@ export default function SharedLinks() {
             ariaSort = 'ascending';
           }
           return (
-            <Button
-              variant="ghost"
-              onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
-              className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
-              aria-sort={ariaSort}
-              aria-label={localize('com_ui_creation_date_sort' as TranslationKeys)}
-              aria-current={sortState ? 'true' : 'false'}
-            >
-              {localize('com_ui_date')}
-              <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
-            </Button>
+            <TooltipAnchor
+              description={localize('com_ui_date_sort')}
+              side="top"
+              render={
+                <Button
+                  variant="ghost"
+                  onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
+                  className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
+                  aria-sort={ariaSort}
+                  aria-label={localize('com_ui_date_sort')}
+                  aria-current={sortState ? 'true' : 'false'}
+                >
+                  {localize('com_ui_date')}
+                  <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
+                </Button>
+              }
+            />
           );
         },
         cell: ({ row }) => formatDate(row.original.createdAt?.toString() ?? '', isSmallScreen),
@@ -247,7 +259,7 @@ export default function SharedLinks() {
       {
         accessorKey: 'actions',
         header: () => (
-          <Label className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm">
+          <Label className="px-2 py-0 text-xs sm:px-2 sm:py-2 sm:text-sm">
             {localize('com_assistants_actions')}
           </Label>
         ),
@@ -330,7 +342,7 @@ export default function SharedLinks() {
             onFilterChange={debouncedFilterChange}
             filterValue={queryParams.search}
             isLoading={isLoading}
-            enableSearch={isSearchEnabled}
+            enableSearch={searchStore.enabled === true}
           />
         </OGDialogContent>
       </OGDialog>
diff --git a/client/src/components/Nav/SettingsTabs/General/ArchivedChatsTable.tsx b/client/src/components/Nav/SettingsTabs/General/ArchivedChatsTable.tsx
index 4147db1b93..46752da5d1 100644
--- a/client/src/components/Nav/SettingsTabs/General/ArchivedChatsTable.tsx
+++ b/client/src/components/Nav/SettingsTabs/General/ArchivedChatsTable.tsx
@@ -2,10 +2,18 @@ import { useState, useCallback, useMemo, useEffect } from 'react';
 import { Trans } from 'react-i18next';
 import debounce from 'lodash/debounce';
 import { useRecoilValue } from 'recoil';
-import { TrashIcon, ArchiveRestore, ArrowUp, ArrowDown, ArrowUpDown } from 'lucide-react';
+import { Link } from 'react-router-dom';
+import {
+  ArrowUp,
+  TrashIcon,
+  ArrowDown,
+  ArrowUpDown,
+  ExternalLink,
+  ArchiveRestore,
+} from 'lucide-react';
 import {
-  Button,
   Label,
+  Button,
   Spinner,
   OGDialog,
   DataTable,
@@ -17,7 +25,6 @@ import {
   OGDialogContent,
 } from '@librechat/client';
 import type { ConversationListParams, TConversation } from 'librechat-data-provider';
-import type { TranslationKeys } from '~/hooks';
 import {
   useConversationsInfiniteQuery,
   useDeleteConversationMutation,
@@ -42,10 +49,10 @@ export default function ArchivedChatsTable({
   onOpenChange: (isOpen: boolean) => void;
 }) {
   const localize = useLocalize();
-  const isSmallScreen = useMediaQuery('(max-width: 768px)');
   const { showToast } = useToastContext();
   const searchState = useRecoilValue(store.search);
   const [isDeleteOpen, setIsDeleteOpen] = useState(false);
+  const isSmallScreen = useMediaQuery('(max-width: 768px)');
   const [queryParams, setQueryParams] = useState<ConversationListParams>(DEFAULT_PARAMS);
   const [deleteConversation, setDeleteConversation] = useState<TConversation | null>(null);
 
@@ -138,35 +145,50 @@ export default function ArchivedChatsTable({
             ariaSort = 'ascending';
           }
           return (
-            <Button
-              variant="ghost"
-              onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
-              className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
-              aria-sort={ariaSort}
-              aria-label={localize('com_nav_archive_name_sort' as TranslationKeys)}
-              aria-current={sortState ? 'true' : 'false'}
-            >
-              {localize('com_nav_archive_name')}
-              <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
-            </Button>
+            <TooltipAnchor
+              description={localize('com_ui_name_sort')}
+              side="top"
+              render={
+                <Button
+                  variant="ghost"
+                  onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
+                  className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
+                  aria-sort={ariaSort}
+                  aria-label={localize('com_ui_name_sort')}
+                  aria-current={sortState ? 'true' : 'false'}
+                >
+                  {localize('com_nav_archive_name')}
+                  <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
+                </Button>
+              }
+            />
           );
         },
         cell: ({ row }) => {
           const { conversationId, title } = row.original;
           return (
-            <button
-              type="button"
-              className="flex items-center gap-2 truncate rounded-sm"
-              onClick={() => window.open(`/c/${conversationId}`, '_blank')}
-            >
+            <div className="flex items-center gap-2">
               <MinimalIcon
                 endpoint={row.original.endpoint}
                 size={28}
                 isCreatedByUser={false}
                 iconClassName="size-4"
               />
-              <span className="underline">{title}</span>
-            </button>
+              <Link
+                to={`/c/${conversationId}`}
+                target="_blank"
+                rel="noopener noreferrer"
+                className="group flex items-center gap-1 truncate rounded-sm text-blue-600 underline decoration-1 underline-offset-2 hover:decoration-2 focus:outline-none focus:ring-2 focus:ring-ring"
+                title={title}
+                aria-label={localize('com_ui_open_archived_chat_new_tab_title', { title })}
+              >
+                <span className="truncate">{title}</span>
+                <ExternalLink
+                  className="size-3 flex-shrink-0 opacity-70 group-hover:opacity-100"
+                  aria-hidden="true"
+                />
+              </Link>
+            </div>
           );
         },
         meta: {
@@ -188,17 +210,23 @@ export default function ArchivedChatsTable({
             ariaSort = 'ascending';
           }
           return (
-            <Button
-              variant="ghost"
-              onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
-              className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
-              aria-sort={ariaSort}
-              aria-label={localize('com_nav_archive_created_at_sort' as TranslationKeys)}
-              aria-current={sortState ? 'true' : 'false'}
-            >
-              {localize('com_nav_archive_created_at')}
-              <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
-            </Button>
+            <TooltipAnchor
+              description={localize('com_ui_date_sort')}
+              side="top"
+              render={
+                <Button
+                  variant="ghost"
+                  onClick={() => column.toggleSorting(column.getIsSorted() === 'asc')}
+                  className="px-2 py-0 text-xs hover:bg-surface-hover sm:px-2 sm:py-2 sm:text-sm"
+                  aria-sort={ariaSort}
+                  aria-label={localize('com_ui_date_sort')}
+                  aria-current={sortState ? 'true' : 'false'}
+                >
+                  {localize('com_nav_archive_created_at')}
+                  <SortIcon className="ml-2 h-3 w-4 sm:h-4 sm:w-4" />
+                </Button>
+              }
+            />
           );
         },
         cell: ({ row }) => formatDate(row.original.createdAt?.toString() ?? '', isSmallScreen),
@@ -219,7 +247,7 @@ export default function ArchivedChatsTable({
           return (
             <div className="flex items-center gap-2">
               <TooltipAnchor
-                description={localize('com_ui_unarchive')}
+                description={localize('com_ui_unarchive_conversation')}
                 render={
                   <Button
                     variant="ghost"
@@ -230,8 +258,8 @@ export default function ArchivedChatsTable({
                         isArchived: false,
                       })
                     }
-                    title={localize('com_ui_unarchive')}
-                    aria-label={localize('com_ui_unarchive')}
+                    title={localize('com_ui_unarchive_conversation')}
+                    aria-label={localize('com_ui_unarchive_conversation')}
                     disabled={unarchiveMutation.isLoading}
                   >
                     {unarchiveMutation.isLoading ? (
@@ -243,7 +271,7 @@ export default function ArchivedChatsTable({
                 }
               />
               <TooltipAnchor
-                description={localize('com_ui_delete')}
+                description={localize('com_ui_delete_conversation_tooltip')}
                 render={
                   <Button
                     variant="ghost"
@@ -252,8 +280,8 @@ export default function ArchivedChatsTable({
                       setDeleteConversation(row.original);
                       setIsDeleteOpen(true);
                     }}
-                    title={localize('com_ui_delete')}
-                    aria-label={localize('com_ui_delete')}
+                    title={localize('com_ui_delete_conversation_tooltip')}
+                    aria-label={localize('com_ui_delete_conversation_tooltip')}
                   >
                     <TrashIcon className="size-4" />
                   </Button>
diff --git a/client/src/components/Nav/SettingsTabs/General/General.tsx b/client/src/components/Nav/SettingsTabs/General/General.tsx
index 4a56dd6d25..1570b2a0d3 100644
--- a/client/src/components/Nav/SettingsTabs/General/General.tsx
+++ b/client/src/components/Nav/SettingsTabs/General/General.tsx
@@ -103,17 +103,21 @@ export const LangSelector = ({
     { value: 'he-HE', label: localize('com_nav_lang_hebrew') },
     { value: 'hu-HU', label: localize('com_nav_lang_hungarian') },
     { value: 'hy-AM', label: localize('com_nav_lang_armenian') },
+    { value: 'is', label: localize('com_nav_lang_icelandic') },
     { value: 'it-IT', label: localize('com_nav_lang_italian') },
     { value: 'nb', label: localize('com_nav_lang_norwegian_bokmal') },
+    { value: 'nn', label: localize('com_nav_lang_norwegian_nynorsk') },
     { value: 'pl-PL', label: localize('com_nav_lang_polish') },
     { value: 'pt-BR', label: localize('com_nav_lang_brazilian_portuguese') },
     { value: 'pt-PT', label: localize('com_nav_lang_portuguese') },
     { value: 'ru-RU', label: localize('com_nav_lang_russian') },
+    { value: 'sk', label: localize('com_nav_lang_slovak') },
     { value: 'ja-JP', label: localize('com_nav_lang_japanese') },
     { value: 'ka-GE', label: localize('com_nav_lang_georgian') },
     { value: 'cs-CZ', label: localize('com_nav_lang_czech') },
     { value: 'sv-SE', label: localize('com_nav_lang_swedish') },
     { value: 'ko-KR', label: localize('com_nav_lang_korean') },
+    { value: 'lt-LT', label: localize('com_nav_lang_lithuanian') },
     { value: 'lv-LV', label: localize('com_nav_lang_latvian') },
     { value: 'vi-VN', label: localize('com_nav_lang_vietnamese') },
     { value: 'th-TH', label: localize('com_nav_lang_thai') },
diff --git a/client/src/components/Plugins/Store/PluginAuthForm.tsx b/client/src/components/Plugins/Store/PluginAuthForm.tsx
index f6eec0a6af..5af1948c11 100644
--- a/client/src/components/Plugins/Store/PluginAuthForm.tsx
+++ b/client/src/components/Plugins/Store/PluginAuthForm.tsx
@@ -56,6 +56,11 @@ function PluginAuthForm({ plugin, onSubmit, isEntityTool }: TPluginAuthFormProps
                       aria-describedby={`${authField}-error`}
                       aria-label={config.label}
                       aria-required="true"
+                      /* autoFocus is generally disabled due to the fact that it can disorient users,
+                       * but in this case, the required field must be navigated to anyways, and the component's functionality
+                       * emulates that of a new modal opening, where users would expect focus to be shifted to the new content */
+                      // eslint-disable-next-line jsx-a11y/no-autofocus
+                      autoFocus={i === 0}
                       {...register(authField, {
                         required: `${config.label} is required.`,
                         minLength: {
@@ -70,7 +75,7 @@ function PluginAuthForm({ plugin, onSubmit, isEntityTool }: TPluginAuthFormProps
                 </HoverCard>
                 {errors[authField] && (
                   <span role="alert" className="mt-1 text-sm text-red-400">
-                    {errors?.[authField]?.message ?? ''}
+                    {String(errors?.[authField]?.message ?? '')}
                   </span>
                 )}
               </div>
diff --git a/client/src/components/Prompts/Groups/DashGroupItem.tsx b/client/src/components/Prompts/Groups/DashGroupItem.tsx
index 0ebe3397f5..d5e8b1a810 100644
--- a/client/src/components/Prompts/Groups/DashGroupItem.tsx
+++ b/client/src/components/Prompts/Groups/DashGroupItem.tsx
@@ -14,6 +14,7 @@ import {
 import { useDeletePromptGroup, useUpdatePromptGroup } from '~/data-provider';
 import CategoryIcon from '~/components/Prompts/Groups/CategoryIcon';
 import { useLocalize, useResourcePermissions } from '~/hooks';
+import { useLiveAnnouncer } from '~/Providers';
 import { cn } from '~/utils';
 
 interface DashGroupItemProps {
@@ -25,6 +26,7 @@ function DashGroupItemComponent({ group, instanceProjectId }: DashGroupItemProps
   const params = useParams();
   const navigate = useNavigate();
   const localize = useLocalize();
+  const { announcePolite } = useLiveAnnouncer();
 
   const blurTimeoutRef = useRef<NodeJS.Timeout | null>(null);
   const [nameInputValue, setNameInputValue] = useState(group.name);
@@ -49,6 +51,8 @@ function DashGroupItemComponent({ group, instanceProjectId }: DashGroupItemProps
   const deleteGroup = useDeletePromptGroup({
     onSuccess: (_response, variables) => {
       if (variables.id === group._id) {
+        const announcement = localize('com_ui_prompt_deleted', { 0: group.name });
+        announcePolite({ message: announcement, isStatus: true });
         navigate('/d/prompts');
       }
     },
diff --git a/client/src/components/Prompts/VariablesDropdown.tsx b/client/src/components/Prompts/VariablesDropdown.tsx
index 1a11761ce9..bfde6525c9 100644
--- a/client/src/components/Prompts/VariablesDropdown.tsx
+++ b/client/src/components/Prompts/VariablesDropdown.tsx
@@ -5,6 +5,7 @@ import { useFormContext } from 'react-hook-form';
 import { DropdownPopup } from '@librechat/client';
 import { specialVariables } from 'librechat-data-provider';
 import type { TSpecialVarLabel } from 'librechat-data-provider';
+import { useLiveAnnouncer } from '~/Providers';
 import { useLocalize } from '~/hooks';
 
 interface VariableOption {
@@ -30,6 +31,7 @@ export default function VariablesDropdown({
   const localize = useLocalize();
   const methods = useFormContext();
   const { setValue, getValues } = methods;
+  const { announcePolite } = useLiveAnnouncer();
 
   const [isMenuOpen, setIsMenuOpen] = useState(false);
 
@@ -39,6 +41,8 @@ export default function VariablesDropdown({
     const prefix = localize(label);
     setValue(fieldName, currentText + spacer + prefix + ': ' + value);
     setIsMenuOpen(false);
+    const announcement = localize('com_ui_special_variable_added', { 0: prefix });
+    announcePolite({ message: announcement, isStatus: true });
   };
 
   return (
diff --git a/client/src/components/SidePanel/Agents/AgentConfig.tsx b/client/src/components/SidePanel/Agents/AgentConfig.tsx
index 2e247a00f0..a81ef780a9 100644
--- a/client/src/components/SidePanel/Agents/AgentConfig.tsx
+++ b/client/src/components/SidePanel/Agents/AgentConfig.tsx
@@ -209,6 +209,7 @@ export default function AgentConfig() {
                     'mt-1 w-56 text-sm text-red-500',
                     errors.name ? 'visible h-auto' : 'invisible h-0',
                   )}
+                  role="alert"
                 >
                   {errors.name ? errors.name.message : ' '}
                 </div>
diff --git a/client/src/components/SidePanel/Agents/AgentFooter.tsx b/client/src/components/SidePanel/Agents/AgentFooter.tsx
index 80a449bb2d..b2fa996596 100644
--- a/client/src/components/SidePanel/Agents/AgentFooter.tsx
+++ b/client/src/components/SidePanel/Agents/AgentFooter.tsx
@@ -1,3 +1,4 @@
+import { Globe } from 'lucide-react';
 import { Spinner } from '@librechat/client';
 import { useWatch, useFormContext } from 'react-hook-form';
 import {
@@ -44,13 +45,20 @@ export default function AgentFooter({
     permissionType: PermissionTypes.AGENTS,
     permission: Permissions.SHARE,
   });
+  const hasAccessToShareRemoteAgents = useHasAccess({
+    permissionType: PermissionTypes.REMOTE_AGENTS,
+    permission: Permissions.SHARE,
+  });
   const { hasPermission, isLoading: permissionsLoading } = useResourcePermissions(
     ResourceType.AGENT,
     agent?._id || '',
   );
+  const { hasPermission: hasRemoteAgentPermission, isLoading: remotePermissionsLoading } =
+    useResourcePermissions(ResourceType.REMOTE_AGENT, agent?._id || '');
 
   const canShareThisAgent = hasPermission(PermissionBits.SHARE);
   const canDeleteThisAgent = hasPermission(PermissionBits.DELETE);
+  const canShareRemoteAgent = hasRemoteAgentPermission(PermissionBits.SHARE);
   const isSaving = createMutation.isLoading || updateMutation.isLoading || isAvatarUploading;
   const renderSaveButton = () => {
     if (isSaving) {
@@ -91,6 +99,25 @@ export default function AgentFooter({
               resourceType={ResourceType.AGENT}
             />
           )}
+        {(agent?.author === user?.id || user?.role === SystemRoles.ADMIN || canShareRemoteAgent) &&
+          hasAccessToShareRemoteAgents &&
+          !remotePermissionsLoading &&
+          agent?._id && (
+            <GenericGrantAccessDialog
+              resourceDbId={agent?._id}
+              resourceId={agent_id}
+              resourceName={agent?.name ?? ''}
+              resourceType={ResourceType.REMOTE_AGENT}
+            >
+              <button
+                type="button"
+                className="btn btn-neutral border-token-border-light h-9 px-3"
+                title={localize('com_ui_remote_access')}
+              >
+                <Globe className="h-4 w-4" aria-hidden="true" />
+              </button>
+            </GenericGrantAccessDialog>
+          )}
         {agent && agent.author === user?.id && <DuplicateAgent agent_id={agent_id} />}
         {/* Submit Button */}
         <button
diff --git a/client/src/components/SidePanel/Agents/AgentPanel.tsx b/client/src/components/SidePanel/Agents/AgentPanel.tsx
index 86ec27dc5e..890488e88d 100644
--- a/client/src/components/SidePanel/Agents/AgentPanel.tsx
+++ b/client/src/components/SidePanel/Agents/AgentPanel.tsx
@@ -1,7 +1,7 @@
-import { Plus } from 'lucide-react';
 import React, { useMemo, useCallback, useRef, useState } from 'react';
+import { Plus } from 'lucide-react';
 import { Button, useToastContext } from '@librechat/client';
-import { useWatch, useForm, FormProvider, type FieldNamesMarkedBoolean } from 'react-hook-form';
+import { useWatch, useForm, FormProvider } from 'react-hook-form';
 import { useGetModelsQuery } from 'librechat-data-provider/react-query';
 import {
   Tools,
@@ -11,8 +11,10 @@ import {
   PermissionBits,
   isAssistantsEndpoint,
 } from 'librechat-data-provider';
-import type { AgentForm, StringOption } from '~/common';
+import type { FieldNamesMarkedBoolean } from 'react-hook-form';
 import type { Agent } from 'librechat-data-provider';
+import type { TranslationKeys } from '~/hooks/useLocalize';
+import type { AgentForm, StringOption } from '~/common';
 import {
   useCreateAgentMutation,
   useUpdateAgentMutation,
@@ -36,8 +38,8 @@ import ModelPanel from './ModelPanel';
 function getUpdateToastMessage(
   noVersionChange: boolean,
   avatarActionState: AgentForm['avatar_action'],
-  name: string | undefined,
-  localize: (key: string, vars?: Record<string, unknown> | Array<string | number>) => string,
+  name: string | null | undefined,
+  localize: (key: TranslationKeys, vars?: Record<string, unknown>) => string,
 ): string | null {
   // If only avatar upload is pending (separate endpoint), suppress the no-changes toast.
   if (noVersionChange && avatarActionState === 'upload') {
@@ -72,6 +74,7 @@ export function composeAgentUpdatePayload(data: AgentForm, agent_id?: string | n
     recursion_limit,
     category,
     support_contact,
+    tool_options,
     avatar_action: avatarActionState,
   } = data;
 
@@ -97,6 +100,7 @@ export function composeAgentUpdatePayload(data: AgentForm, agent_id?: string | n
       recursion_limit,
       category,
       support_contact,
+      tool_options,
       ...(shouldResetAvatar ? { avatar: null } : {}),
     },
     provider,
@@ -545,7 +549,7 @@ export default function AgentPanel() {
           <AgentFooter
             createMutation={create}
             updateMutation={update}
-            isAvatarUploading={isAvatarUploadInFlight || uploadAvatarMutation.isPending}
+            isAvatarUploading={isAvatarUploadInFlight || uploadAvatarMutation.isLoading}
             activePanel={activePanel}
             setActivePanel={setActivePanel}
             setCurrentAgentId={setCurrentAgentId}
diff --git a/client/src/components/SidePanel/Agents/AgentSelect.tsx b/client/src/components/SidePanel/Agents/AgentSelect.tsx
index 9a3ef387c9..a9e4ef7036 100644
--- a/client/src/components/SidePanel/Agents/AgentSelect.tsx
+++ b/client/src/components/SidePanel/Agents/AgentSelect.tsx
@@ -111,6 +111,11 @@ export default function AgentSelect({
           return;
         }
 
+        if (name === 'tool_options' && typeof value === 'object' && value !== null) {
+          formValues[name] = value;
+          return;
+        }
+
         if (!keys.has(name)) {
           return;
         }
diff --git a/client/src/components/SidePanel/Agents/Code/Action.tsx b/client/src/components/SidePanel/Agents/Code/Action.tsx
index 5d943f0a60..6919ab1339 100644
--- a/client/src/components/SidePanel/Agents/Code/Action.tsx
+++ b/client/src/components/SidePanel/Agents/Code/Action.tsx
@@ -14,6 +14,7 @@ import type { AgentForm } from '~/common';
 import { useLocalize, useCodeApiKeyForm } from '~/hooks';
 import ApiKeyDialog from './ApiKeyDialog';
 import { ESide } from '~/common';
+import { cn } from '~/utils';
 
 export default function Action({ authType = '', isToolAuthenticated = false }) {
   const localize = useLocalize();
@@ -73,7 +74,10 @@ export default function Action({ authType = '', isToolAuthenticated = false }) {
           <label
             id="execute-code-label"
             htmlFor="execute-code-checkbox"
-            className="form-check-label text-token-text-primary cursor-pointer"
+            className={cn(
+              'form-check-label text-token-text-primary',
+              (runCodeIsEnabled || isToolAuthenticated) && 'cursor-pointer',
+            )}
           >
             {localize('com_ui_run_code')}
           </label>
diff --git a/client/src/components/SidePanel/Agents/MCPTool.tsx b/client/src/components/SidePanel/Agents/MCPTool.tsx
index 25d7c4c424..e9f888b7e5 100644
--- a/client/src/components/SidePanel/Agents/MCPTool.tsx
+++ b/client/src/components/SidePanel/Agents/MCPTool.tsx
@@ -1,25 +1,32 @@
 import React, { useState } from 'react';
-import { ChevronDown } from 'lucide-react';
 import { useFormContext } from 'react-hook-form';
 import { Constants } from 'librechat-data-provider';
+import { ChevronDown, Clock, Code2 } from 'lucide-react';
 import * as AccordionPrimitive from '@radix-ui/react-accordion';
 import {
   Label,
-  ESide,
   Checkbox,
   OGDialog,
   Accordion,
   TrashIcon,
-  InfoHoverCard,
+  TooltipAnchor,
   AccordionItem,
   OGDialogTrigger,
   AccordionContent,
   OGDialogTemplate,
 } from '@librechat/client';
 import type { AgentForm, MCPServerInfo } from '~/common';
-import { useLocalize, useMCPServerManager, useRemoveMCPTool } from '~/hooks';
+import {
+  useAgentCapabilities,
+  useMCPServerManager,
+  useGetAgentsConfig,
+  useMCPToolOptions,
+  useRemoveMCPTool,
+  useLocalize,
+} from '~/hooks';
 import MCPServerStatusIcon from '~/components/MCP/MCPServerStatusIcon';
 import MCPConfigDialog from '~/components/MCP/MCPConfigDialog';
+import MCPToolItem from './MCPToolItem';
 import { cn } from '~/utils';
 
 export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo }) {
@@ -27,6 +34,21 @@ export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo })
   const { removeTool } = useRemoveMCPTool();
   const { getValues, setValue } = useFormContext<AgentForm>();
   const { getServerStatusIconProps, getConfigDialogProps } = useMCPServerManager();
+  const { agentsConfig } = useGetAgentsConfig();
+  const { deferredToolsEnabled, programmaticToolsEnabled } = useAgentCapabilities(
+    agentsConfig?.capabilities,
+  );
+
+  const {
+    isToolDeferred,
+    isToolProgrammatic,
+    toggleToolDefer,
+    toggleToolProgrammatic,
+    areAllToolsDeferred,
+    areAllToolsProgrammatic,
+    toggleDeferAll,
+    toggleProgrammaticAll,
+  } = useMCPToolOptions();
 
   const [isFocused, setIsFocused] = useState(false);
   const [isHovering, setIsHovering] = useState(false);
@@ -37,32 +59,38 @@ export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo })
   }
 
   const currentServerName = serverInfo.serverName;
+  const tools = serverInfo.tools || [];
 
   const getSelectedTools = () => {
-    if (!serverInfo?.tools) return [];
     const formTools = getValues('tools') || [];
-    return serverInfo.tools.filter((t) => formTools.includes(t.tool_id)).map((t) => t.tool_id);
+    return tools.filter((t) => formTools.includes(t.tool_id)).map((t) => t.tool_id);
   };
 
   const updateFormTools = (newSelectedTools: string[]) => {
     const currentTools = getValues('tools') || [];
-    const otherTools = currentTools.filter(
-      (t: string) => !serverInfo?.tools?.some((st) => st.tool_id === t),
-    );
+    const otherTools = currentTools.filter((t: string) => !tools.some((st) => st.tool_id === t));
     setValue('tools', [...otherTools, ...newSelectedTools]);
   };
 
+  const toggleToolSelect = (toolId: string) => {
+    const selectedTools = getSelectedTools();
+    const newSelectedTools = selectedTools.includes(toolId)
+      ? selectedTools.filter((t) => t !== toolId)
+      : [...selectedTools, toolId];
+    updateFormTools(newSelectedTools);
+  };
+
   const selectedTools = getSelectedTools();
   const isExpanded = accordionValue === currentServerName;
+  const allDeferred = areAllToolsDeferred(tools);
+  const allProgrammatic = areAllToolsProgrammatic(tools);
 
   const statusIconProps = getServerStatusIconProps(currentServerName);
   const configDialogProps = getConfigDialogProps();
 
   const statusIcon = statusIconProps && (
     <div
-      onClick={(e) => {
-        e.stopPropagation();
-      }}
+      onClick={(e) => e.stopPropagation()}
       className="cursor-pointer rounded p-0.5 hover:bg-surface-secondary"
     >
       <MCPServerStatusIcon {...statusIconProps} />
@@ -87,14 +115,7 @@ export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo })
             <AccordionPrimitive.Header asChild>
               <div
                 className="flex grow cursor-pointer select-none items-center gap-1 rounded bg-transparent p-0 text-left transition-colors focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-1"
-                onClick={() =>
-                  setAccordionValue((prev) => {
-                    if (prev) {
-                      return '';
-                    }
-                    return currentServerName;
-                  })
-                }
+                onClick={() => setAccordionValue((prev) => (prev ? '' : currentServerName))}
               >
                 {statusIcon && <div className="flex items-center">{statusIcon}</div>}
 
@@ -134,18 +155,15 @@ export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo })
                           <Checkbox
                             id={`select-all-${currentServerName}`}
                             checked={
-                              selectedTools.length === serverInfo.tools?.length &&
-                              selectedTools.length > 0
+                              selectedTools.length === tools.length && selectedTools.length > 0
                             }
                             onCheckedChange={(checked) => {
-                              if (serverInfo.tools) {
-                                const newSelectedTools = checked
-                                  ? serverInfo.tools.map((t) => t.tool_id)
-                                  : [
-                                      `${Constants.mcp_server}${Constants.mcp_delimiter}${currentServerName}`,
-                                    ];
-                                updateFormTools(newSelectedTools);
-                              }
+                              const newSelectedTools = checked
+                                ? tools.map((t) => t.tool_id)
+                                : [
+                                    `${Constants.mcp_server}${Constants.mcp_delimiter}${currentServerName}`,
+                                  ];
+                              updateFormTools(newSelectedTools);
                             }}
                             className={cn(
                               'h-4 w-4 rounded border border-border-medium transition-all duration-200 hover:border-border-heavy',
@@ -162,22 +180,100 @@ export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo })
                             }}
                             tabIndex={isExpanded ? 0 : -1}
                             aria-label={
-                              selectedTools.length === serverInfo.tools?.length &&
-                              selectedTools.length > 0
+                              selectedTools.length === tools.length && selectedTools.length > 0
                                 ? localize('com_ui_deselect_all')
                                 : localize('com_ui_select_all')
                             }
                           />
                         </div>
 
+                        {deferredToolsEnabled && (
+                          <TooltipAnchor
+                            description={
+                              allDeferred
+                                ? localize('com_ui_mcp_undefer_all')
+                                : localize('com_ui_mcp_defer_all')
+                            }
+                            side="top"
+                            role="button"
+                            tabIndex={isExpanded ? 0 : -1}
+                            aria-label={
+                              allDeferred
+                                ? localize('com_ui_mcp_undefer_all')
+                                : localize('com_ui_mcp_defer_all')
+                            }
+                            aria-pressed={allDeferred}
+                            className={cn(
+                              'flex h-7 w-7 items-center justify-center rounded transition-colors duration-200',
+                              'focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-1',
+                              isExpanded ? 'visible' : 'pointer-events-none invisible',
+                              allDeferred
+                                ? 'bg-amber-500/20 text-amber-500 hover:bg-amber-500/30'
+                                : 'text-text-tertiary hover:bg-surface-hover hover:text-text-primary',
+                            )}
+                            onClick={(e) => {
+                              e.stopPropagation();
+                              toggleDeferAll(tools);
+                            }}
+                            onKeyDown={(e) => {
+                              if (e.key === 'Enter' || e.key === ' ') {
+                                e.preventDefault();
+                                e.stopPropagation();
+                                toggleDeferAll(tools);
+                              }
+                            }}
+                          >
+                            <Clock className={cn('h-4 w-4', allDeferred && 'fill-amber-500/30')} />
+                          </TooltipAnchor>
+                        )}
+
+                        {programmaticToolsEnabled && (
+                          <TooltipAnchor
+                            description={
+                              allProgrammatic
+                                ? localize('com_ui_mcp_unprogrammatic_all')
+                                : localize('com_ui_mcp_programmatic_all')
+                            }
+                            side="top"
+                            role="button"
+                            tabIndex={isExpanded ? 0 : -1}
+                            aria-label={
+                              allProgrammatic
+                                ? localize('com_ui_mcp_unprogrammatic_all')
+                                : localize('com_ui_mcp_programmatic_all')
+                            }
+                            aria-pressed={allProgrammatic}
+                            className={cn(
+                              'flex h-7 w-7 items-center justify-center rounded transition-colors duration-200',
+                              'focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-1',
+                              isExpanded ? 'visible' : 'pointer-events-none invisible',
+                              allProgrammatic
+                                ? 'bg-violet-500/20 text-violet-500 hover:bg-violet-500/30'
+                                : 'text-text-tertiary hover:bg-surface-hover hover:text-text-primary',
+                            )}
+                            onClick={(e) => {
+                              e.stopPropagation();
+                              toggleProgrammaticAll(tools);
+                            }}
+                            onKeyDown={(e) => {
+                              if (e.key === 'Enter' || e.key === ' ') {
+                                e.preventDefault();
+                                e.stopPropagation();
+                                toggleProgrammaticAll(tools);
+                              }
+                            }}
+                          >
+                            <Code2
+                              className={cn('h-4 w-4', allProgrammatic && 'fill-violet-500/30')}
+                            />
+                          </TooltipAnchor>
+                        )}
+
                         <div className="flex items-center gap-1">
-                          {/* Caret button for accordion */}
                           <AccordionPrimitive.Trigger asChild>
                             <button
                               type="button"
-                              onClick={(e) => {
-                                e.stopPropagation();
-                              }}
+                              onClick={(e) => e.stopPropagation()}
                               className={cn(
                                 'flex h-7 w-7 items-center justify-center rounded transition-colors duration-200 hover:bg-surface-active-alt focus:translate-x-0 focus:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-1',
                                 isExpanded && 'bg-surface-active-alt',
@@ -207,10 +303,7 @@ export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo })
                           <OGDialogTrigger asChild>
                             <button
                               type="button"
-                              className={cn(
-                                'flex h-7 w-7 items-center justify-center rounded transition-colors duration-200',
-                                'hover:bg-surface-active-alt focus:translate-x-0 focus:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-1',
-                              )}
+                              className="flex h-7 w-7 items-center justify-center rounded transition-colors duration-200 hover:bg-surface-active-alt focus:translate-x-0 focus:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-1"
                               onClick={(e) => e.stopPropagation()}
                               aria-label={`Delete ${currentServerName}`}
                               tabIndex={0}
@@ -230,51 +323,19 @@ export default function MCPTool({ serverInfo }: { serverInfo?: MCPServerInfo })
 
           <AccordionContent className="relative ml-1 pt-1 before:absolute before:bottom-2 before:left-0 before:top-0 before:w-0.5 before:bg-border-medium">
             <div className="space-y-1">
-              {serverInfo.tools?.map((subTool) => (
-                <label
-                  key={subTool.tool_id}
-                  htmlFor={subTool.tool_id}
-                  className={cn(
-                    'group/item border-token-border-light hover:bg-token-surface-secondary flex cursor-pointer items-center rounded-lg border p-2',
-                    'ml-2 mr-1 focus-within:ring-2 focus-within:ring-ring focus-within:ring-offset-2 focus-within:ring-offset-background',
-                  )}
-                  onClick={(e) => e.stopPropagation()}
-                  onKeyDown={(e) => {
-                    e.stopPropagation();
-                  }}
-                >
-                  <Checkbox
-                    id={subTool.tool_id}
-                    checked={selectedTools.includes(subTool.tool_id)}
-                    onCheckedChange={(_checked) => {
-                      const newSelectedTools = selectedTools.includes(subTool.tool_id)
-                        ? selectedTools.filter((t) => t !== subTool.tool_id)
-                        : [...selectedTools, subTool.tool_id];
-                      updateFormTools(newSelectedTools);
-                    }}
-                    onKeyDown={(e) => {
-                      e.stopPropagation();
-                      if (e.key === 'Enter' || e.key === ' ') {
-                        e.preventDefault();
-                        const checkbox = e.currentTarget as HTMLButtonElement;
-                        checkbox.click();
-                      }
-                    }}
-                    onClick={(e) => e.stopPropagation()}
-                    className={cn(
-                      'relative float-left mr-2 inline-flex h-4 w-4 cursor-pointer rounded border border-border-medium transition-[border-color] duration-200 hover:border-border-heavy focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 focus:ring-offset-background',
-                    )}
-                    aria-label={subTool.metadata.name}
-                  />
-                  <span className="text-token-text-primary select-none">
-                    {subTool.metadata.name}
-                  </span>
-                  {subTool.metadata.description && (
-                    <div className="ml-auto flex items-center opacity-0 transition-opacity duration-200 group-focus-within/item:opacity-100 group-hover/item:opacity-100">
-                      <InfoHoverCard side={ESide.Left} text={subTool.metadata.description} />
-                    </div>
-                  )}
-                </label>
+              {tools.map((tool) => (
+                <MCPToolItem
+                  key={tool.tool_id}
+                  tool={tool}
+                  isSelected={selectedTools.includes(tool.tool_id)}
+                  isDeferred={deferredToolsEnabled && isToolDeferred(tool.tool_id)}
+                  isProgrammatic={programmaticToolsEnabled && isToolProgrammatic(tool.tool_id)}
+                  deferredToolsEnabled={deferredToolsEnabled}
+                  programmaticToolsEnabled={programmaticToolsEnabled}
+                  onToggleSelect={() => toggleToolSelect(tool.tool_id)}
+                  onToggleDefer={() => toggleToolDefer(tool.tool_id)}
+                  onToggleProgrammatic={() => toggleToolProgrammatic(tool.tool_id)}
+                />
               ))}
             </div>
           </AccordionContent>
diff --git a/client/src/components/SidePanel/Agents/MCPToolItem.tsx b/client/src/components/SidePanel/Agents/MCPToolItem.tsx
new file mode 100644
index 0000000000..e2fbd79802
--- /dev/null
+++ b/client/src/components/SidePanel/Agents/MCPToolItem.tsx
@@ -0,0 +1,153 @@
+import React from 'react';
+import { Clock, MoreHorizontal, Code2 } from 'lucide-react';
+import {
+  Checkbox,
+  DropdownMenu,
+  DropdownMenuLabel,
+  DropdownMenuTrigger,
+  DropdownMenuContent,
+  DropdownMenuSeparator,
+  DropdownMenuCheckboxItem,
+} from '@librechat/client';
+import type { AgentToolType } from 'librechat-data-provider';
+import { useLocalize } from '~/hooks';
+import { cn } from '~/utils';
+
+interface MCPToolItemProps {
+  tool: AgentToolType;
+  isSelected: boolean;
+  isDeferred: boolean;
+  isProgrammatic: boolean;
+  deferredToolsEnabled: boolean;
+  programmaticToolsEnabled: boolean;
+  onToggleSelect: () => void;
+  onToggleDefer: () => void;
+  onToggleProgrammatic: () => void;
+}
+
+function getToolItemStyle(isDeferred: boolean, isProgrammatic: boolean): string {
+  if (isDeferred && isProgrammatic) {
+    return 'border-purple-500/50 bg-purple-500/5 hover:bg-purple-500/10';
+  }
+  if (isDeferred) {
+    return 'border-amber-500/50 bg-amber-500/5 hover:bg-amber-500/10';
+  }
+  if (isProgrammatic) {
+    return 'border-violet-500/50 bg-violet-500/5 hover:bg-violet-500/10';
+  }
+  return 'border-token-border-light hover:bg-token-surface-secondary';
+}
+
+export default function MCPToolItem({
+  tool,
+  isSelected,
+  isDeferred,
+  onToggleDefer,
+  onToggleSelect,
+  isProgrammatic,
+  onToggleProgrammatic,
+  deferredToolsEnabled,
+  programmaticToolsEnabled,
+}: MCPToolItemProps) {
+  const localize = useLocalize();
+  const hasOptions = isDeferred || isProgrammatic;
+
+  return (
+    <div
+      className={cn(
+        'group/item flex cursor-pointer items-center rounded-lg border p-2',
+        'ml-2 mr-1 focus-within:ring-2 focus-within:ring-ring focus-within:ring-offset-2 focus-within:ring-offset-background',
+        getToolItemStyle(isDeferred, isProgrammatic),
+      )}
+      onClick={(e) => e.stopPropagation()}
+      onKeyDown={(e) => e.stopPropagation()}
+    >
+      <Checkbox
+        id={tool.tool_id}
+        checked={isSelected}
+        onCheckedChange={onToggleSelect}
+        onKeyDown={(e) => {
+          e.stopPropagation();
+          if (e.key === 'Enter' || e.key === ' ') {
+            e.preventDefault();
+            const checkbox = e.currentTarget as HTMLButtonElement;
+            checkbox.click();
+          }
+        }}
+        onClick={(e) => e.stopPropagation()}
+        className="relative mr-2 inline-flex h-4 w-4 shrink-0 cursor-pointer rounded border border-border-medium transition-[border-color] duration-200 hover:border-border-heavy focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 focus:ring-offset-background"
+        aria-label={tool.metadata.name}
+      />
+      <span className="text-token-text-primary min-w-0 flex-1 select-none truncate">
+        {tool.metadata.name}
+      </span>
+      <div className="ml-2 flex shrink-0 items-center gap-1.5">
+        {isDeferred && <Clock className="h-3.5 w-3.5 text-amber-500" aria-hidden="true" />}
+        {isProgrammatic && <Code2 className="h-3.5 w-3.5 text-violet-500" aria-hidden="true" />}
+        <DropdownMenu>
+          <DropdownMenuTrigger asChild>
+            <button
+              type="button"
+              className={cn(
+                'flex h-6 w-6 items-center justify-center rounded transition-all duration-200',
+                'focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-1',
+                hasOptions
+                  ? 'text-text-secondary hover:bg-surface-hover hover:text-text-primary'
+                  : 'text-text-tertiary opacity-0 hover:bg-surface-hover hover:text-text-primary group-focus-within/item:opacity-100 group-hover/item:opacity-100',
+              )}
+              onClick={(e) => e.stopPropagation()}
+              aria-label={localize('com_ui_mcp_tool_options')}
+            >
+              <MoreHorizontal className="h-4 w-4" />
+            </button>
+          </DropdownMenuTrigger>
+          <DropdownMenuContent
+            align="end"
+            side="left"
+            className="w-80"
+            onClick={(e) => e.stopPropagation()}
+          >
+            <DropdownMenuLabel className="text-xs font-normal text-text-primary">
+              {tool.metadata.description || localize('com_ui_mcp_no_description')}
+            </DropdownMenuLabel>
+            <DropdownMenuSeparator />
+            {deferredToolsEnabled && (
+              <DropdownMenuCheckboxItem
+                checked={isDeferred}
+                onCheckedChange={onToggleDefer}
+                className="cursor-pointer"
+              >
+                <div className="flex items-center gap-2">
+                  <Clock className="h-4 w-4 text-amber-500" />
+                  <div className="flex flex-col">
+                    <span>{localize('com_ui_mcp_defer_loading')}</span>
+                    <span className="text-xs text-text-secondary">
+                      {localize('com_ui_mcp_click_to_defer')}
+                    </span>
+                  </div>
+                </div>
+              </DropdownMenuCheckboxItem>
+            )}
+            {programmaticToolsEnabled && (
+              <DropdownMenuCheckboxItem
+                checked={isProgrammatic}
+                onCheckedChange={onToggleProgrammatic}
+                className="cursor-pointer"
+              >
+                <div className="flex items-center gap-2">
+                  <Code2 className="h-4 w-4 text-violet-500" />
+                  <div className="flex flex-col">
+                    <span>{localize('com_ui_mcp_programmatic')}</span>
+                    <span className="text-xs text-text-secondary">
+                      {localize('com_ui_mcp_click_to_programmatic')}
+                    </span>
+                  </div>
+                </div>
+              </DropdownMenuCheckboxItem>
+            )}
+          </DropdownMenuContent>
+        </DropdownMenu>
+      </div>
+    </div>
+  );
+}
diff --git a/client/src/components/SidePanel/Agents/MCPTools.tsx b/client/src/components/SidePanel/Agents/MCPTools.tsx
index fa028b2d55..3dc9a19d6a 100644
--- a/client/src/components/SidePanel/Agents/MCPTools.tsx
+++ b/client/src/components/SidePanel/Agents/MCPTools.tsx
@@ -1,10 +1,10 @@
 import React from 'react';
+import { PermissionTypes, Permissions } from 'librechat-data-provider';
 import UninitializedMCPTool from './UninitializedMCPTool';
 import UnconfiguredMCPTool from './UnconfiguredMCPTool';
-import { useAgentPanelContext } from '~/Providers';
 import { useHasAccess, useLocalize } from '~/hooks';
+import { useAgentPanelContext } from '~/Providers';
 import MCPTool from './MCPTool';
-import { PermissionTypes, Permissions } from 'librechat-data-provider';
 
 export default function MCPTools({
   agentId,
@@ -46,7 +46,7 @@ export default function MCPTools({
               return null;
             }
 
-            if (serverInfo.isConnected) {
+            if (serverInfo?.tools?.length && serverInfo.tools.length > 0) {
               return (
                 <MCPTool key={`${serverInfo.serverName}-${agentId}`} serverInfo={serverInfo} />
               );
diff --git a/client/src/components/SidePanel/Agents/ModelPanel.tsx b/client/src/components/SidePanel/Agents/ModelPanel.tsx
index bfcac5bdea..cec4041947 100644
--- a/client/src/components/SidePanel/Agents/ModelPanel.tsx
+++ b/client/src/components/SidePanel/Agents/ModelPanel.tsx
@@ -15,6 +15,7 @@ import {
 import type * as t from 'librechat-data-provider';
 import type { AgentForm, AgentModelPanelProps, StringOption } from '~/common';
 import { useGetEndpointsQuery } from '~/data-provider';
+import { useLiveAnnouncer } from '~/Providers';
 import { useLocalize } from '~/hooks';
 import { Panel } from '~/common';
 import { cn } from '~/utils';
@@ -25,6 +26,7 @@ export default function ModelPanel({
   models: modelsData,
 }: Pick<AgentModelPanelProps, 'models' | 'providers' | 'setActivePanel'>) {
   const localize = useLocalize();
+  const { announcePolite } = useLiveAnnouncer();
 
   const { control, setValue } = useFormContext<AgentForm>();
 
@@ -91,6 +93,7 @@ export default function ModelPanel({
 
   const handleResetParameters = () => {
     setValue('model_parameters', {} as t.AgentModelParameters);
+    announcePolite({ message: localize('com_ui_model_parameters_reset'), isStatus: true });
   };
 
   return (
diff --git a/client/src/components/SidePanel/Agents/Search/Action.tsx b/client/src/components/SidePanel/Agents/Search/Action.tsx
index d71d0878fa..79019e28b7 100644
--- a/client/src/components/SidePanel/Agents/Search/Action.tsx
+++ b/client/src/components/SidePanel/Agents/Search/Action.tsx
@@ -14,6 +14,7 @@ import type { AgentForm } from '~/common';
 import { useLocalize, useSearchApiKeyForm } from '~/hooks';
 import ApiKeyDialog from './ApiKeyDialog';
 import { ESide } from '~/common';
+import { cn } from '~/utils';
 
 export default function Action({
   authTypes = [],
@@ -81,7 +82,10 @@ export default function Action({
           <label
             id="web-search-label"
             htmlFor="web-search-checkbox"
-            className="form-check-label text-token-text-primary cursor-pointer"
+            className={cn(
+              'form-check-label text-token-text-primary',
+              (webSearchIsEnabled || isToolAuthenticated) && 'cursor-pointer',
+            )}
           >
             {localize('com_ui_web_search')}
           </label>
diff --git a/client/src/components/SidePanel/Agents/__tests__/AgentFooter.spec.tsx b/client/src/components/SidePanel/Agents/__tests__/AgentFooter.spec.tsx
index 3425f5a75c..8d882bffe8 100644
--- a/client/src/components/SidePanel/Agents/__tests__/AgentFooter.spec.tsx
+++ b/client/src/components/SidePanel/Agents/__tests__/AgentFooter.spec.tsx
@@ -174,7 +174,7 @@ jest.mock('~/components/Sharing', () => ({
     resourceType: ResourceType;
   }) => (
     <div
-      data-testid="grant-access-dialog"
+      data-testid={`grant-access-dialog-${resourceType}`}
       data-resource-db-id={resourceDbId}
       data-resource-id={resourceId}
       data-resource-name={resourceName}
@@ -274,7 +274,7 @@ describe('AgentFooter', () => {
       expect(screen.getByTestId('version-button')).toBeInTheDocument();
       expect(screen.getByTestId('delete-button')).toBeInTheDocument();
       expect(screen.queryByTestId('admin-settings')).not.toBeInTheDocument();
-      expect(screen.getByTestId('grant-access-dialog')).toBeInTheDocument();
+      expect(screen.getByTestId('grant-access-dialog-agent')).toBeInTheDocument();
       expect(screen.getByTestId('duplicate-button')).toBeInTheDocument();
       expect(screen.queryByTestId('spinner')).not.toBeInTheDocument();
     });
@@ -338,7 +338,7 @@ describe('AgentFooter', () => {
       expect(screen.getByText('Create')).toBeInTheDocument();
       expect(screen.queryByTestId('version-button')).not.toBeInTheDocument();
       expect(screen.queryByTestId('delete-button')).not.toBeInTheDocument();
-      expect(screen.queryByTestId('grant-access-dialog')).not.toBeInTheDocument();
+      expect(screen.queryByTestId('grant-access-dialog-agent')).not.toBeInTheDocument();
       expect(screen.queryByTestId('duplicate-agent')).not.toBeInTheDocument();
     });
 
@@ -346,7 +346,7 @@ describe('AgentFooter', () => {
       mockUseAuthContext.mockReturnValue(createAuthContext(mockUsers.admin));
       const { unmount } = render(<AgentFooter {...defaultProps} />);
       expect(screen.getByTestId('admin-settings')).toBeInTheDocument();
-      expect(screen.getByTestId('grant-access-dialog')).toBeInTheDocument();
+      expect(screen.getByTestId('grant-access-dialog-agent')).toBeInTheDocument();
 
       // Clean up the first render
       unmount();
@@ -363,7 +363,7 @@ describe('AgentFooter', () => {
         return undefined;
       });
       render(<AgentFooter {...defaultProps} />);
-      expect(screen.queryByTestId('grant-access-dialog')).toBeInTheDocument(); // Still shows because hasAccess is true
+      expect(screen.queryByTestId('grant-access-dialog-agent')).toBeInTheDocument(); // Still shows because hasAccess is true
       expect(screen.queryByTestId('duplicate-agent')).not.toBeInTheDocument(); // Should not show for different author
     });
 
@@ -392,7 +392,7 @@ describe('AgentFooter', () => {
         permissionBits: 0,
       });
       render(<AgentFooter {...defaultProps} />);
-      expect(screen.queryByTestId('grant-access-dialog')).not.toBeInTheDocument();
+      expect(screen.queryByTestId('grant-access-dialog-agent')).not.toBeInTheDocument();
     });
 
     test('hides action buttons when permissions are loading', () => {
@@ -419,7 +419,7 @@ describe('AgentFooter', () => {
       });
       render(<AgentFooter {...defaultProps} />);
       expect(screen.queryByTestId('delete-button')).not.toBeInTheDocument();
-      expect(screen.queryByTestId('grant-access-dialog')).not.toBeInTheDocument();
+      expect(screen.queryByTestId('grant-access-dialog-agent')).not.toBeInTheDocument();
       // Duplicate button should still show as it doesn't depend on permissions loading
       expect(screen.getByTestId('duplicate-button')).toBeInTheDocument();
     });
diff --git a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/MCPServerForm.tsx b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/MCPServerForm.tsx
index 188c518597..d4096ea96a 100644
--- a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/MCPServerForm.tsx
+++ b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/MCPServerForm.tsx
@@ -1,10 +1,10 @@
 import { FormProvider } from 'react-hook-form';
+import type { useMCPServerForm } from './hooks/useMCPServerForm';
 import ConnectionSection from './sections/ConnectionSection';
 import BasicInfoSection from './sections/BasicInfoSection';
 import TransportSection from './sections/TransportSection';
-import AuthSection from './sections/AuthSection';
 import TrustSection from './sections/TrustSection';
-import type { useMCPServerForm } from './hooks/useMCPServerForm';
+import AuthSection from './sections/AuthSection';
 
 interface MCPServerFormProps {
   formHook: ReturnType<typeof useMCPServerForm>;
diff --git a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/index.tsx b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/index.tsx
index f86d3f8056..c9d3473d60 100644
--- a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/index.tsx
+++ b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/index.tsx
@@ -1,13 +1,18 @@
 import React, { useState, useEffect } from 'react';
+import { Copy, CopyCheck } from 'lucide-react';
 import {
-  OGDialog,
-  OGDialogTemplate,
-  OGDialogContent,
-  OGDialogHeader,
-  OGDialogTitle,
+  Label,
+  Input,
   Button,
-  TrashIcon,
   Spinner,
+  TrashIcon,
+  useToastContext,
+  OGDialog,
+  OGDialogTitle,
+  OGDialogHeader,
+  OGDialogFooter,
+  OGDialogContent,
+  OGDialogTemplate,
 } from '@librechat/client';
 import {
   SystemRoles,
@@ -16,10 +21,10 @@ import {
   PermissionBits,
   PermissionTypes,
 } from 'librechat-data-provider';
-import { GenericGrantAccessDialog } from '~/components/Sharing';
 import { useAuthContext, useHasAccess, useResourcePermissions, MCPServerDefinition } from '~/hooks';
-import { useLocalize } from '~/hooks';
+import { GenericGrantAccessDialog } from '~/components/Sharing';
 import { useMCPServerForm } from './hooks/useMCPServerForm';
+import { useLocalize, useCopyToClipboard } from '~/hooks';
 import MCPServerForm from './MCPServerForm';
 
 interface MCPServerDialogProps {
@@ -39,8 +44,10 @@ export default function MCPServerDialog({
 }: MCPServerDialogProps) {
   const localize = useLocalize();
   const { user } = useAuthContext();
+  const { showToast } = useToastContext();
 
   // State for dialogs
+  const [isCopying, setIsCopying] = useState(false);
   const [showDeleteConfirm, setShowDeleteConfirm] = useState(false);
   const [showRedirectUriDialog, setShowRedirectUriDialog] = useState(false);
   const [createdServerId, setCreatedServerId] = useState<string | null>(null);
@@ -99,20 +106,26 @@ export default function MCPServerDialog({
     ? `${window.location.origin}/api/mcp/${createdServerId}/oauth/callback`
     : '';
 
+  const copyLink = useCopyToClipboard({ text: redirectUri });
+
   return (
     <>
       {/* Delete confirmation dialog */}
       <OGDialog open={showDeleteConfirm} onOpenChange={(isOpen) => setShowDeleteConfirm(isOpen)}>
         <OGDialogTemplate
-          title={localize('com_ui_delete')}
-          className="max-w-[450px]"
-          main={<p className="text-left text-sm">{localize('com_ui_mcp_server_delete_confirm')}</p>}
-          selection={{
-            selectHandler: handleDelete,
-            selectClasses:
-              'bg-destructive text-white transition-all duration-200 hover:bg-destructive/80',
-            selectText: isDeleting ? <Spinner /> : localize('com_ui_delete'),
-          }}
+          title={localize('com_ui_delete_mcp_server')}
+          className="w-11/12 max-w-md"
+          description={localize('com_ui_mcp_server_delete_confirm', { 0: server?.serverName })}
+          selection={
+            <Button
+              onClick={handleDelete}
+              variant="destructive"
+              aria-live="polite"
+              aria-label={isDeleting ? localize('com_ui_deleting') : localize('com_ui_delete')}
+            >
+              {isDeleting ? <Spinner /> : localize('com_ui_delete')}
+            </Button>
+          }
         />
       </OGDialog>
 
@@ -127,48 +140,53 @@ export default function MCPServerDialog({
           }
         }}
       >
-        <OGDialogContent className="w-full max-w-lg border-none bg-surface-primary text-text-primary">
-          <OGDialogHeader className="border-b border-border-light px-4 py-3">
+        <OGDialogContent showCloseButton={false} className="w-11/12 max-w-lg">
+          <OGDialogHeader>
             <OGDialogTitle>{localize('com_ui_mcp_server_created')}</OGDialogTitle>
           </OGDialogHeader>
-          <div className="space-y-4 p-4">
-            <p className="text-sm text-text-secondary">
-              {localize('com_ui_redirect_uri_instructions')}
-            </p>
-            <div className="rounded-lg border border-border-medium bg-surface-secondary p-3">
-              <label className="mb-2 block text-xs font-medium text-text-secondary">
+          <div className="space-y-4">
+            <p className="text-sm">{localize('com_ui_redirect_uri_instructions')}</p>
+
+            <div className="space-y-2">
+              <Label htmlFor="redirect-uri-input" className="text-sm font-medium">
                 {localize('com_ui_redirect_uri')}
-              </label>
+              </Label>
               <div className="flex items-center gap-2">
-                <input
-                  className="flex-1 rounded border border-border-medium bg-surface-primary px-3 py-2 text-sm"
-                  value={redirectUri}
+                <Input
+                  id="redirect-uri-input"
+                  type="text"
                   readOnly
+                  value={redirectUri}
+                  className="flex-1 text-text-secondary"
                 />
                 <Button
-                  onClick={() => {
-                    navigator.clipboard.writeText(redirectUri);
-                  }}
+                  size="icon"
                   variant="outline"
-                  className="whitespace-nowrap"
+                  onClick={() => {
+                    if (isCopying) return;
+                    showToast({ message: localize('com_ui_copied_to_clipboard') });
+                    copyLink(setIsCopying);
+                  }}
+                  disabled={isCopying}
+                  className="p-0"
+                  aria-label={localize('com_ui_copy_link')}
                 >
-                  {localize('com_ui_copy_link')}
+                  {isCopying ? <CopyCheck className="size-4" /> : <Copy className="size-4" />}
                 </Button>
               </div>
             </div>
-            <div className="flex justify-end">
+            <OGDialogFooter>
               <Button
+                variant="default"
                 onClick={() => {
                   setShowRedirectUriDialog(false);
                   onOpenChange(false);
                   setCreatedServerId(null);
                 }}
-                variant="submit"
-                className="text-white"
               >
                 {localize('com_ui_done')}
               </Button>
-            </div>
+            </OGDialogFooter>
           </div>
         </OGDialogContent>
       </OGDialog>
@@ -187,6 +205,7 @@ export default function MCPServerDialog({
                 })
               : undefined
           }
+          showCloseButton={false}
           className="w-11/12 md:max-w-3xl"
           main={<MCPServerForm formHook={formHook} />}
           footerClassName="sm:justify-between"
@@ -194,16 +213,15 @@ export default function MCPServerDialog({
             isEditMode ? (
               <div className="flex items-center gap-2">
                 <Button
-                  type="button"
-                  variant="outline"
+                  variant="destructive"
                   size="sm"
-                  aria-label={localize('com_ui_delete')}
+                  aria-label={localize('com_ui_delete_mcp_server_name', {
+                    0: server?.config?.title || server?.serverName || '',
+                  })}
                   onClick={() => setShowDeleteConfirm(true)}
                   disabled={isSubmitting || isDeleting}
                 >
-                  <div className="flex w-full items-center justify-center gap-2 text-red-500">
-                    <TrashIcon />
-                  </div>
+                  <TrashIcon aria-hidden="true" />
                 </Button>
                 {shouldShowShareButton && server && (
                   <GenericGrantAccessDialog
@@ -218,10 +236,15 @@ export default function MCPServerDialog({
           buttons={
             <Button
               type="button"
-              variant="submit"
+              variant={isEditMode ? 'default' : 'submit'}
               onClick={onSubmit}
               disabled={isSubmitting}
-              className="text-white"
+              aria-live="polite"
+              aria-label={
+                isSubmitting
+                  ? localize(isEditMode ? 'com_ui_updating' : 'com_ui_creating')
+                  : localize(isEditMode ? 'com_ui_update_mcp_server' : 'com_ui_create_mcp_server')
+              }
             >
               {isSubmitting ? (
                 <Spinner className="size-4" />
diff --git a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/AuthSection.tsx b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/AuthSection.tsx
index 7d247a39a3..6d18ccf15b 100644
--- a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/AuthSection.tsx
+++ b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/AuthSection.tsx
@@ -1,11 +1,11 @@
 import { useMemo, useState } from 'react';
+import { Copy, CopyCheck } from 'lucide-react';
 import { useFormContext, useWatch } from 'react-hook-form';
 import { Label, Input, Checkbox, SecretInput, Radio, useToastContext } from '@librechat/client';
-import { Copy, CopyCheck } from 'lucide-react';
-import { useLocalize, useCopyToClipboard } from '~/hooks';
-import { cn } from '~/utils';
 import { AuthTypeEnum, AuthorizationTypeEnum } from '../hooks/useMCPServerForm';
 import type { MCPServerFormData } from '../hooks/useMCPServerForm';
+import { useLocalize, useCopyToClipboard } from '~/hooks';
+import { cn } from '~/utils';
 
 interface AuthSectionProps {
   isEditMode: boolean;
@@ -62,15 +62,20 @@ export default function AuthSection({ isEditMode, serverName }: AuthSectionProps
   return (
     <div className="space-y-3">
       {/* Auth Type Radio */}
-      <div className="space-y-1.5">
-        <Label className="text-sm font-medium">{localize('com_ui_authentication')}</Label>
+      <fieldset className="space-y-1.5">
+        <legend>
+          <Label id="auth-type-label" className="text-sm font-medium">
+            {localize('com_ui_authentication')}
+          </Label>
+        </legend>
         <Radio
           options={authTypeOptions}
           value={authType || AuthTypeEnum.None}
           onChange={(val) => setValue('auth.auth_type', val as AuthTypeEnum)}
           fullWidth
+          aria-labelledby="auth-type-label"
         />
-      </div>
+      </fieldset>
 
       {/* API Key Fields */}
       {authType === AuthTypeEnum.ServiceHttp && (
@@ -83,9 +88,13 @@ export default function AuthSection({ isEditMode, serverName }: AuthSectionProps
               onCheckedChange={(checked) =>
                 setValue('auth.api_key_source', checked ? 'user' : 'admin')
               }
-              aria-label={localize('com_ui_user_provides_key')}
+              aria-labelledby="user_provides_key_label"
             />
-            <label htmlFor="user_provides_key" className="cursor-pointer text-sm">
+            <label
+              id="user_provides_key_label"
+              htmlFor="user_provides_key"
+              className="cursor-pointer text-sm"
+            >
               {localize('com_ui_user_provides_key')}
             </label>
           </div>
@@ -101,8 +110,12 @@ export default function AuthSection({ isEditMode, serverName }: AuthSectionProps
           )}
 
           {/* Header Format Radio */}
-          <div className="space-y-1.5">
-            <Label className="text-sm font-medium">{localize('com_ui_header_format')}</Label>
+          <fieldset className="space-y-1.5">
+            <legend>
+              <Label id="header-format-label" className="text-sm font-medium">
+                {localize('com_ui_header_format')}
+              </Label>
+            </legend>
             <Radio
               options={headerFormatOptions}
               value={authorizationType || AuthorizationTypeEnum.Bearer}
@@ -110,8 +123,9 @@ export default function AuthSection({ isEditMode, serverName }: AuthSectionProps
                 setValue('auth.api_key_authorization_type', val as AuthorizationTypeEnum)
               }
               fullWidth
+              aria-labelledby="header-format-label"
             />
-          </div>
+          </fieldset>
 
           {/* Custom header name */}
           {authorizationType === AuthorizationTypeEnum.Custom && (
@@ -137,27 +151,67 @@ export default function AuthSection({ isEditMode, serverName }: AuthSectionProps
             <div className="space-y-1.5">
               <Label htmlFor="oauth_client_id" className="text-sm font-medium">
                 {localize('com_ui_client_id')}{' '}
-                {!isEditMode && <span className="text-text-secondary">*</span>}
+                {!isEditMode && (
+                  <>
+                    <span aria-hidden="true" className="text-text-secondary">
+                      *
+                    </span>
+                    <span className="sr-only">{localize('com_ui_field_required')}</span>
+                  </>
+                )}
               </Label>
               <Input
                 id="oauth_client_id"
                 autoComplete="off"
                 placeholder={isEditMode ? localize('com_ui_leave_blank_to_keep') : ''}
+                aria-invalid={errors.auth?.oauth_client_id ? 'true' : 'false'}
+                aria-describedby={
+                  errors.auth?.oauth_client_id ? 'oauth-client-id-error' : undefined
+                }
                 {...register('auth.oauth_client_id', { required: !isEditMode })}
-                className={cn(errors.auth?.oauth_client_id && 'border-red-500')}
+                className={cn(errors.auth?.oauth_client_id && 'border-border-destructive')}
               />
+              {errors.auth?.oauth_client_id && (
+                <p
+                  id="oauth-client-id-error"
+                  role="alert"
+                  className="text-xs text-text-destructive"
+                >
+                  {localize('com_ui_field_required')}
+                </p>
+              )}
             </div>
             <div className="space-y-1.5">
               <Label htmlFor="oauth_client_secret" className="text-sm font-medium">
                 {localize('com_ui_client_secret')}{' '}
-                {!isEditMode && <span className="text-text-secondary">*</span>}
+                {!isEditMode && (
+                  <>
+                    <span aria-hidden="true" className="text-text-secondary">
+                      *
+                    </span>
+                    <span className="sr-only">{localize('com_ui_field_required')}</span>
+                  </>
+                )}
               </Label>
               <SecretInput
                 id="oauth_client_secret"
                 placeholder={isEditMode ? localize('com_ui_leave_blank_to_keep') : ''}
+                aria-invalid={errors.auth?.oauth_client_secret ? 'true' : 'false'}
+                aria-describedby={
+                  errors.auth?.oauth_client_secret ? 'oauth-client-secret-error' : undefined
+                }
                 {...register('auth.oauth_client_secret', { required: !isEditMode })}
-                className={cn(errors.auth?.oauth_client_secret && 'border-red-500')}
+                className={cn(errors.auth?.oauth_client_secret && 'border-border-destructive')}
               />
+              {errors.auth?.oauth_client_secret && (
+                <p
+                  id="oauth-client-secret-error"
+                  role="alert"
+                  className="text-xs text-text-destructive"
+                >
+                  {localize('com_ui_field_required')}
+                </p>
+              )}
             </div>
           </div>
 
@@ -196,9 +250,12 @@ export default function AuthSection({ isEditMode, serverName }: AuthSectionProps
           {/* Redirect URI */}
           {isEditMode && redirectUri && (
             <div className="space-y-1.5">
-              <Label className="text-sm font-medium">{localize('com_ui_redirect_uri')}</Label>
+              <Label htmlFor="auth-redirect-uri" className="text-sm font-medium">
+                {localize('com_ui_redirect_uri')}
+              </Label>
               <div className="flex items-center gap-2">
                 <Input
+                  id="auth-redirect-uri"
                   type="text"
                   readOnly
                   value={redirectUri}
diff --git a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/BasicInfoSection.tsx b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/BasicInfoSection.tsx
index 634387928a..fd78d0bced 100644
--- a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/BasicInfoSection.tsx
+++ b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/BasicInfoSection.tsx
@@ -1,9 +1,9 @@
 import { useFormContext } from 'react-hook-form';
-import { Input, Label, TextareaAutosize } from '@librechat/client';
+import { Input, Label, Textarea } from '@librechat/client';
+import type { MCPServerFormData } from '../hooks/useMCPServerForm';
+import MCPIcon from '~/components/SidePanel/Agents/MCPIcon';
 import { useLocalize } from '~/hooks';
 import { cn } from '~/utils';
-import MCPIcon from '~/components/SidePanel/Agents/MCPIcon';
-import type { MCPServerFormData } from '../hooks/useMCPServerForm';
 
 export default function BasicInfoSection() {
   const localize = useLocalize();
@@ -36,13 +36,19 @@ export default function BasicInfoSection() {
           <MCPIcon icon={iconValue} onIconChange={handleIconChange} />
         </div>
         <div className="w-full space-y-1.5 sm:flex-1">
-          <Label htmlFor="title" className="text-sm font-medium">
-            {localize('com_ui_name')} <span className="text-text-secondary">*</span>
+          <Label htmlFor="mcp-title" className="text-sm font-medium">
+            {localize('com_ui_name')}{' '}
+            <span aria-hidden="true" className="text-text-secondary">
+              *
+            </span>
+            <span className="sr-only">{localize('com_ui_field_required')}</span>
           </Label>
           <Input
-            id="title"
+            id="mcp-title"
             autoComplete="off"
             placeholder={localize('com_agents_mcp_name_placeholder')}
+            aria-invalid={errors.title ? 'true' : 'false'}
+            aria-describedby={errors.title ? 'mcp-title-error' : undefined}
             {...register('title', {
               required: localize('com_ui_field_required'),
               pattern: {
@@ -50,26 +56,26 @@ export default function BasicInfoSection() {
                 message: localize('com_ui_mcp_title_invalid'),
               },
             })}
-            className={cn(errors.title && 'border-red-500 focus:border-red-500')}
+            className={cn(errors.title && 'border-border-destructive')}
           />
-          {errors.title && <p className="text-xs text-red-500">{errors.title.message}</p>}
+          {errors.title && (
+            <p id="mcp-title-error" role="alert" className="text-xs text-text-destructive">
+              {errors.title.message}
+            </p>
+          )}
         </div>
       </div>
 
-      {/* Description - always visible, full width */}
+      {/* Description */}
       <div className="space-y-1.5">
-        <Label htmlFor="description" className="text-sm font-medium">
+        <Label htmlFor="mcp-description" className="text-sm font-medium">
           {localize('com_ui_description')}{' '}
           <span className="text-xs text-text-secondary">{localize('com_ui_optional')}</span>
         </Label>
-        <TextareaAutosize
-          id="description"
-          aria-label={localize('com_ui_description')}
+        <Textarea
+          id="mcp-description"
           placeholder={localize('com_agents_mcp_description_placeholder')}
           {...register('description')}
-          minRows={2}
-          maxRows={4}
-          className="w-full resize-none rounded-lg border border-input bg-transparent px-3 py-2 text-sm placeholder:text-muted-foreground focus-visible:outline-none"
         />
       </div>
     </div>
diff --git a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/ConnectionSection.tsx b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/ConnectionSection.tsx
index 5d7094fd83..ee77a54699 100644
--- a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/ConnectionSection.tsx
+++ b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/ConnectionSection.tsx
@@ -15,13 +15,19 @@ export default function ConnectionSection() {
   return (
     <div className="space-y-1.5">
       <Label htmlFor="url" className="text-sm font-medium">
-        {localize('com_ui_mcp_url')} <span className="text-text-secondary">*</span>
+        {localize('com_ui_mcp_url')}{' '}
+        <span aria-hidden="true" className="text-text-secondary">
+          *
+        </span>
+        <span className="sr-only">{localize('com_ui_field_required')}</span>
       </Label>
       <Input
         id="url"
         type="url"
         autoComplete="off"
         placeholder={localize('com_ui_mcp_server_url_placeholder')}
+        aria-invalid={errors.url ? 'true' : 'false'}
+        aria-describedby={errors.url ? 'url-error' : undefined}
         {...register('url', {
           required: localize('com_ui_field_required'),
           validate: (value) => {
@@ -29,9 +35,13 @@ export default function ConnectionSection() {
             return isValidUrl(normalized) || localize('com_ui_mcp_invalid_url');
           },
         })}
-        className={cn(errors.url && 'border-red-500 focus:border-red-500')}
+        className={cn(errors.url && 'border-border-destructive')}
       />
-      {errors.url && <p className="text-xs text-red-500">{errors.url.message}</p>}
+      {errors.url && (
+        <p id="url-error" role="alert" className="text-xs text-text-destructive">
+          {errors.url.message}
+        </p>
+      )}
     </div>
   );
 }
diff --git a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TransportSection.tsx b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TransportSection.tsx
index 80d4595719..5c7b610b70 100644
--- a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TransportSection.tsx
+++ b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TransportSection.tsx
@@ -25,14 +25,19 @@ export default function TransportSection() {
   );
 
   return (
-    <div className="space-y-2">
-      <Label className="text-sm font-medium">{localize('com_ui_mcp_transport')}</Label>
+    <fieldset className="space-y-2">
+      <legend>
+        <Label id="transport-label" className="text-sm font-medium">
+          {localize('com_ui_mcp_transport')}
+        </Label>
+      </legend>
       <Radio
         options={transportOptions}
         value={transportType}
         onChange={handleTransportChange}
         fullWidth
+        aria-labelledby="transport-label"
       />
-    </div>
+    </fieldset>
   );
 }
diff --git a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TrustSection.tsx b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TrustSection.tsx
index 854ac717b7..36d8d73a49 100644
--- a/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TrustSection.tsx
+++ b/client/src/components/SidePanel/MCPBuilder/MCPServerDialog/sections/TrustSection.tsx
@@ -26,17 +26,17 @@ export default function TrustSection() {
               checked={field.value}
               onCheckedChange={field.onChange}
               aria-labelledby="trust-label"
-              aria-describedby="trust-description"
+              aria-describedby={
+                errors.trust ? 'trust-description trust-error' : 'trust-description'
+              }
+              aria-invalid={errors.trust ? 'true' : 'false'}
+              aria-required="true"
               className="mt-0.5"
             />
           )}
         />
-        <Label
-          id="trust-label"
-          htmlFor="trust"
-          className="flex cursor-pointer flex-col gap-0.5 text-sm"
-        >
-          <span className="font-medium text-text-primary">
+        <Label htmlFor="trust" className="flex cursor-pointer flex-col gap-0.5 text-sm">
+          <span id="trust-label" className="font-medium text-text-primary">
             {startupConfig?.interface?.mcpServers?.trustCheckbox?.label ? (
               <span
                 dangerouslySetInnerHTML={{
@@ -49,7 +49,9 @@ export default function TrustSection() {
             ) : (
               localize('com_ui_trust_app')
             )}{' '}
-            <span className="text-text-secondary">*</span>
+            <span aria-hidden="true" className="text-text-secondary">
+              *
+            </span>
           </span>
           <span id="trust-description" className="text-xs font-normal text-text-secondary">
             {startupConfig?.interface?.mcpServers?.trustCheckbox?.subLabel ? (
@@ -68,7 +70,9 @@ export default function TrustSection() {
         </Label>
       </div>
       {errors.trust && (
-        <p className="mt-2 text-xs text-red-500">{localize('com_ui_field_required')}</p>
+        <p id="trust-error" role="alert" className="mt-2 text-xs text-text-destructive">
+          {localize('com_ui_field_required')}
+        </p>
       )}
     </div>
   );
diff --git a/client/src/components/SidePanel/SidePanelGroup.tsx b/client/src/components/SidePanel/SidePanelGroup.tsx
index 14473127b5..171947cd6b 100644
--- a/client/src/components/SidePanel/SidePanelGroup.tsx
+++ b/client/src/components/SidePanel/SidePanelGroup.tsx
@@ -6,7 +6,7 @@ import { ResizablePanel, ResizablePanelGroup, useMediaQuery } from '@librechat/c
 import type { ImperativePanelHandle } from 'react-resizable-panels';
 import { useGetStartupConfig } from '~/data-provider';
 import ArtifactsPanel from './ArtifactsPanel';
-import { normalizeLayout } from '~/utils';
+import { normalizeLayout, cn } from '~/utils';
 import SidePanel from './SidePanel';
 import store from '~/store';
 
@@ -149,9 +149,9 @@ const SidePanelGroup = memo(
         )}
         {!hideSidePanel && interfaceConfig.sidePanel === true && (
           <button
-            aria-label="Close right side panel"
-            className={`nav-mask ${!isCollapsed ? 'active' : ''}`}
             onClick={handleClosePanel}
+            aria-label="Close right side panel"
+            className={cn('sidenav-mask', !isCollapsed ? 'active' : '')}
           />
         )}
       </>
diff --git a/client/src/components/Tools/MCPToolSelectDialog.tsx b/client/src/components/Tools/MCPToolSelectDialog.tsx
index 487f767250..a27484d4e8 100644
--- a/client/src/components/Tools/MCPToolSelectDialog.tsx
+++ b/client/src/components/Tools/MCPToolSelectDialog.tsx
@@ -96,17 +96,17 @@ function MCPToolSelectDialog({
         await new Promise((resolve) => setTimeout(resolve, 500));
       }
 
-      // Then initialize server if needed
+      // Only initialize if no cached tools exist; skip if tools are already available from DB
       const serverInfo = mcpServersMap.get(serverName);
-      if (!serverInfo?.isConnected) {
+      if (!serverInfo?.tools?.length) {
         const result = await initializeServer(serverName);
-        if (result?.success && result.oauthRequired && result.oauthUrl) {
+        if (result?.oauthRequired && result.oauthUrl) {
           setIsInitializing(null);
-          return;
+          return; // OAuth flow must complete first
         }
       }
 
-      // Finally, add tools to form
+      // Add tools to form (refetches from backend's persisted cache)
       await addToolsToForm(serverName);
       setIsInitializing(null);
     } catch (error) {
diff --git a/client/src/data-provider/MCP/queries.ts b/client/src/data-provider/MCP/queries.ts
index afc17f3a93..8590e43735 100644
--- a/client/src/data-provider/MCP/queries.ts
+++ b/client/src/data-provider/MCP/queries.ts
@@ -12,10 +12,10 @@ export const useMCPServersQuery = <TData = t.MCPServersListResponse>(
     [QueryKeys.mcpServers],
     () => dataService.getMCPServers(),
     {
-      staleTime: 1000 * 60 * 5, // 5 minutes - data stays fresh longer
-      refetchOnWindowFocus: false,
+      staleTime: 30 * 1000, // 30 seconds — short enough to pick up servers that finish initializing after first load
+      refetchOnWindowFocus: true,
       refetchOnReconnect: false,
-      refetchOnMount: false,
+      refetchOnMount: true,
       retry: false,
       ...config,
     },
diff --git a/client/src/data-provider/roles.ts b/client/src/data-provider/roles.ts
index 46edcd2dc9..356d9bd145 100644
--- a/client/src/data-provider/roles.ts
+++ b/client/src/data-provider/roles.ts
@@ -4,14 +4,15 @@ import {
   dataService,
   promptPermissionsSchema,
   memoryPermissionsSchema,
+  mcpServersPermissionsSchema,
   marketplacePermissionsSchema,
   peoplePickerPermissionsSchema,
-  mcpServersPermissionsSchema,
+  remoteAgentsPermissionsSchema,
 } from 'librechat-data-provider';
 import type {
-  UseQueryOptions,
-  UseMutationResult,
   QueryObserverResult,
+  UseMutationResult,
+  UseQueryOptions,
 } from '@tanstack/react-query';
 import type * as t from 'librechat-data-provider';
 
@@ -243,3 +244,39 @@ export const useUpdateMarketplacePermissionsMutation = (
     },
   );
 };
+
+export const useUpdateRemoteAgentsPermissionsMutation = (
+  options?: t.UpdateRemoteAgentsPermOptions,
+): UseMutationResult<
+  t.UpdatePermResponse,
+  t.TError | undefined,
+  t.UpdateRemoteAgentsPermVars,
+  unknown
+> => {
+  const queryClient = useQueryClient();
+  const { onMutate, onSuccess, onError } = options ?? {};
+  return useMutation(
+    (variables) => {
+      remoteAgentsPermissionsSchema.partial().parse(variables.updates);
+      return dataService.updateRemoteAgentsPermissions(variables);
+    },
+    {
+      onSuccess: (data, variables, context) => {
+        queryClient.invalidateQueries([QueryKeys.roles, variables.roleName]);
+        if (onSuccess) {
+          onSuccess(data, variables, context);
+        }
+      },
+      onError: (...args) => {
+        const error = args[0];
+        if (error != null) {
+          console.error('Failed to update remote agents permissions:', error);
+        }
+        if (onError) {
+          onError(...args);
+        }
+      },
+      onMutate,
+    },
+  );
+};
diff --git a/client/src/hooks/Agents/__tests__/useAgentCapabilities.spec.ts b/client/src/hooks/Agents/__tests__/useAgentCapabilities.spec.ts
new file mode 100644
index 0000000000..f6ff8dcbab
--- /dev/null
+++ b/client/src/hooks/Agents/__tests__/useAgentCapabilities.spec.ts
@@ -0,0 +1,112 @@
+import { renderHook } from '@testing-library/react';
+import { AgentCapabilities } from 'librechat-data-provider';
+import useAgentCapabilities from '../useAgentCapabilities';
+
+describe('useAgentCapabilities', () => {
+  it('should return all capabilities as false when capabilities is undefined', () => {
+    const { result } = renderHook(() => useAgentCapabilities(undefined));
+
+    expect(result.current.toolsEnabled).toBe(false);
+    expect(result.current.actionsEnabled).toBe(false);
+    expect(result.current.artifactsEnabled).toBe(false);
+    expect(result.current.ocrEnabled).toBe(false);
+    expect(result.current.contextEnabled).toBe(false);
+    expect(result.current.fileSearchEnabled).toBe(false);
+    expect(result.current.webSearchEnabled).toBe(false);
+    expect(result.current.codeEnabled).toBe(false);
+    expect(result.current.deferredToolsEnabled).toBe(false);
+    expect(result.current.programmaticToolsEnabled).toBe(false);
+  });
+
+  it('should return all capabilities as false when capabilities is empty array', () => {
+    const { result } = renderHook(() => useAgentCapabilities([]));
+
+    expect(result.current.toolsEnabled).toBe(false);
+    expect(result.current.deferredToolsEnabled).toBe(false);
+    expect(result.current.programmaticToolsEnabled).toBe(false);
+  });
+
+  it('should return true for enabled capabilities', () => {
+    const capabilities = [
+      AgentCapabilities.tools,
+      AgentCapabilities.deferred_tools,
+      AgentCapabilities.file_search,
+    ];
+
+    const { result } = renderHook(() => useAgentCapabilities(capabilities));
+
+    expect(result.current.toolsEnabled).toBe(true);
+    expect(result.current.deferredToolsEnabled).toBe(true);
+    expect(result.current.fileSearchEnabled).toBe(true);
+    expect(result.current.actionsEnabled).toBe(false);
+    expect(result.current.webSearchEnabled).toBe(false);
+  });
+
+  it('should return deferredToolsEnabled as true when deferred_tools is in capabilities', () => {
+    const capabilities = [AgentCapabilities.deferred_tools];
+
+    const { result } = renderHook(() => useAgentCapabilities(capabilities));
+
+    expect(result.current.deferredToolsEnabled).toBe(true);
+  });
+
+  it('should return deferredToolsEnabled as false when deferred_tools is not in capabilities', () => {
+    const capabilities = [
+      AgentCapabilities.tools,
+      AgentCapabilities.actions,
+      AgentCapabilities.artifacts,
+    ];
+
+    const { result } = renderHook(() => useAgentCapabilities(capabilities));
+
+    expect(result.current.deferredToolsEnabled).toBe(false);
+  });
+
+  it('should return programmaticToolsEnabled as true when programmatic_tools is in capabilities', () => {
+    const capabilities = [AgentCapabilities.programmatic_tools];
+
+    const { result } = renderHook(() => useAgentCapabilities(capabilities));
+
+    expect(result.current.programmaticToolsEnabled).toBe(true);
+  });
+
+  it('should return programmaticToolsEnabled as false when programmatic_tools is not in capabilities', () => {
+    const capabilities = [
+      AgentCapabilities.tools,
+      AgentCapabilities.actions,
+      AgentCapabilities.artifacts,
+    ];
+
+    const { result } = renderHook(() => useAgentCapabilities(capabilities));
+
+    expect(result.current.programmaticToolsEnabled).toBe(false);
+  });
+
+  it('should handle all capabilities being enabled', () => {
+    const capabilities = [
+      AgentCapabilities.tools,
+      AgentCapabilities.actions,
+      AgentCapabilities.artifacts,
+      AgentCapabilities.ocr,
+      AgentCapabilities.context,
+      AgentCapabilities.file_search,
+      AgentCapabilities.web_search,
+      AgentCapabilities.execute_code,
+      AgentCapabilities.deferred_tools,
+      AgentCapabilities.programmatic_tools,
+    ];
+
+    const { result } = renderHook(() => useAgentCapabilities(capabilities));
+
+    expect(result.current.toolsEnabled).toBe(true);
+    expect(result.current.actionsEnabled).toBe(true);
+    expect(result.current.artifactsEnabled).toBe(true);
+    expect(result.current.ocrEnabled).toBe(true);
+    expect(result.current.contextEnabled).toBe(true);
+    expect(result.current.fileSearchEnabled).toBe(true);
+    expect(result.current.webSearchEnabled).toBe(true);
+    expect(result.current.codeEnabled).toBe(true);
+    expect(result.current.deferredToolsEnabled).toBe(true);
+    expect(result.current.programmaticToolsEnabled).toBe(true);
+  });
+});
diff --git a/client/src/hooks/Agents/__tests__/useMCPToolOptions.spec.ts b/client/src/hooks/Agents/__tests__/useMCPToolOptions.spec.ts
new file mode 100644
index 0000000000..caba94016f
--- /dev/null
+++ b/client/src/hooks/Agents/__tests__/useMCPToolOptions.spec.ts
@@ -0,0 +1,656 @@
+import { renderHook, act } from '@testing-library/react';
+import { useFormContext, useWatch } from 'react-hook-form';
+import type { AgentToolType } from 'librechat-data-provider';
+import useMCPToolOptions from '../useMCPToolOptions';
+
+jest.mock('react-hook-form', () => ({
+  useFormContext: jest.fn(),
+  useWatch: jest.fn(),
+}));
+
+const mockSetValue = jest.fn();
+const mockGetValues = jest.fn();
+
+const createMockTool = (toolId: string): AgentToolType => ({
+  tool_id: toolId,
+  metadata: { name: toolId, description: `Description for ${toolId}` },
+});
+
+describe('useMCPToolOptions', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    (useFormContext as jest.Mock).mockReturnValue({
+      getValues: mockGetValues,
+      setValue: mockSetValue,
+      control: {},
+    });
+    (useWatch as jest.Mock).mockReturnValue(undefined);
+    mockGetValues.mockReturnValue({});
+  });
+
+  describe('isToolDeferred', () => {
+    it('should return false when tool_options is undefined', () => {
+      (useWatch as jest.Mock).mockReturnValue(undefined);
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolDeferred('tool1')).toBe(false);
+    });
+
+    it('should return false when tool has no options', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolDeferred('tool1')).toBe(false);
+    });
+
+    it('should return false when defer_loading is not set', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['direct'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolDeferred('tool1')).toBe(false);
+    });
+
+    it('should return true when defer_loading is true', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolDeferred('tool1')).toBe(true);
+    });
+
+    it('should return false when defer_loading is false', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: false },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolDeferred('tool1')).toBe(false);
+    });
+  });
+
+  describe('isToolProgrammatic', () => {
+    it('should return false when tool_options is undefined', () => {
+      (useWatch as jest.Mock).mockReturnValue(undefined);
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolProgrammatic('tool1')).toBe(false);
+    });
+
+    it('should return false when tool has no options', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolProgrammatic('tool1')).toBe(false);
+    });
+
+    it('should return false when allowed_callers does not include code_execution', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['direct'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolProgrammatic('tool1')).toBe(false);
+    });
+
+    it('should return true when allowed_callers includes code_execution', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolProgrammatic('tool1')).toBe(true);
+    });
+
+    it('should return true when allowed_callers includes both direct and code_execution', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['direct', 'code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.isToolProgrammatic('tool1')).toBe(true);
+    });
+  });
+
+  describe('toggleToolDefer', () => {
+    it('should enable defer_loading for a tool with no existing options', () => {
+      mockGetValues.mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolDefer('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { defer_loading: true } },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should enable defer_loading while preserving other options', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolDefer('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { allowed_callers: ['code_execution'], defer_loading: true } },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should disable defer_loading and preserve other options', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true, allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolDefer('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { allowed_callers: ['code_execution'] } },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should remove tool entry entirely when disabling defer_loading and no other options exist', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolDefer('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith('tool_options', {}, { shouldDirty: true });
+    });
+
+    it('should preserve other tools when toggling', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolDefer('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool2: { defer_loading: true } },
+        { shouldDirty: true },
+      );
+    });
+  });
+
+  describe('toggleToolProgrammatic', () => {
+    it('should enable programmatic calling for a tool with no existing options', () => {
+      mockGetValues.mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolProgrammatic('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { allowed_callers: ['code_execution'] } },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should enable programmatic calling while preserving defer_loading', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolProgrammatic('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { defer_loading: true, allowed_callers: ['code_execution'] } },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should disable programmatic calling and preserve defer_loading', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true, allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolProgrammatic('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { defer_loading: true } },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should remove tool entry entirely when disabling programmatic and no other options exist', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolProgrammatic('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith('tool_options', {}, { shouldDirty: true });
+    });
+
+    it('should preserve other tools when toggling', () => {
+      mockGetValues.mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+        tool2: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleToolProgrammatic('tool1');
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool2: { defer_loading: true } },
+        { shouldDirty: true },
+      );
+    });
+  });
+
+  describe('areAllToolsDeferred', () => {
+    it('should return false for empty tools array', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.areAllToolsDeferred([])).toBe(false);
+    });
+
+    it('should return false when no tools are deferred', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      expect(result.current.areAllToolsDeferred(tools)).toBe(false);
+    });
+
+    it('should return false when some tools are deferred', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      expect(result.current.areAllToolsDeferred(tools)).toBe(false);
+    });
+
+    it('should return true when all tools are deferred', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      expect(result.current.areAllToolsDeferred(tools)).toBe(true);
+    });
+  });
+
+  describe('areAllToolsProgrammatic', () => {
+    it('should return false for empty tools array', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.areAllToolsProgrammatic([])).toBe(false);
+    });
+
+    it('should return false when no tools are programmatic', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      expect(result.current.areAllToolsProgrammatic(tools)).toBe(false);
+    });
+
+    it('should return false when some tools are programmatic', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      expect(result.current.areAllToolsProgrammatic(tools)).toBe(false);
+    });
+
+    it('should return true when all tools are programmatic', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+        tool2: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      expect(result.current.areAllToolsProgrammatic(tools)).toBe(true);
+    });
+  });
+
+  describe('toggleDeferAll', () => {
+    it('should do nothing for empty tools array', () => {
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleDeferAll([]);
+      });
+
+      expect(mockSetValue).not.toHaveBeenCalled();
+    });
+
+    it('should defer all tools when none are deferred', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+      mockGetValues.mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleDeferAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        {
+          tool1: { defer_loading: true },
+          tool2: { defer_loading: true },
+        },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should undefer all tools when all are deferred', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: true },
+      });
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleDeferAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith('tool_options', {}, { shouldDirty: true });
+    });
+
+    it('should defer all when some are deferred (brings to consistent state)', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: true },
+      });
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleDeferAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        {
+          tool1: { defer_loading: true },
+          tool2: { defer_loading: true },
+        },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should preserve other options when deferring', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+      mockGetValues.mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleDeferAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        {
+          tool1: { allowed_callers: ['code_execution'], defer_loading: true },
+          tool2: { defer_loading: true },
+        },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should preserve other options when undeferring', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: true, allowed_callers: ['code_execution'] },
+        tool2: { defer_loading: true },
+      });
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true, allowed_callers: ['code_execution'] },
+        tool2: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleDeferAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { allowed_callers: ['code_execution'] } },
+        { shouldDirty: true },
+      );
+    });
+  });
+
+  describe('toggleProgrammaticAll', () => {
+    it('should do nothing for empty tools array', () => {
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      act(() => {
+        result.current.toggleProgrammaticAll([]);
+      });
+
+      expect(mockSetValue).not.toHaveBeenCalled();
+    });
+
+    it('should make all tools programmatic when none are', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+      mockGetValues.mockReturnValue({});
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleProgrammaticAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        {
+          tool1: { allowed_callers: ['code_execution'] },
+          tool2: { allowed_callers: ['code_execution'] },
+        },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should remove programmatic from all tools when all are programmatic', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+        tool2: { allowed_callers: ['code_execution'] },
+      });
+      mockGetValues.mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+        tool2: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleProgrammaticAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith('tool_options', {}, { shouldDirty: true });
+    });
+
+    it('should make all programmatic when some are (brings to consistent state)', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+      });
+      mockGetValues.mockReturnValue({
+        tool1: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleProgrammaticAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        {
+          tool1: { allowed_callers: ['code_execution'] },
+          tool2: { allowed_callers: ['code_execution'] },
+        },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should preserve defer_loading when making programmatic', () => {
+      (useWatch as jest.Mock).mockReturnValue({});
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleProgrammaticAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        {
+          tool1: { defer_loading: true, allowed_callers: ['code_execution'] },
+          tool2: { allowed_callers: ['code_execution'] },
+        },
+        { shouldDirty: true },
+      );
+    });
+
+    it('should preserve defer_loading when removing programmatic', () => {
+      (useWatch as jest.Mock).mockReturnValue({
+        tool1: { defer_loading: true, allowed_callers: ['code_execution'] },
+        tool2: { allowed_callers: ['code_execution'] },
+      });
+      mockGetValues.mockReturnValue({
+        tool1: { defer_loading: true, allowed_callers: ['code_execution'] },
+        tool2: { allowed_callers: ['code_execution'] },
+      });
+
+      const { result } = renderHook(() => useMCPToolOptions());
+      const tools = [createMockTool('tool1'), createMockTool('tool2')];
+
+      act(() => {
+        result.current.toggleProgrammaticAll(tools);
+      });
+
+      expect(mockSetValue).toHaveBeenCalledWith(
+        'tool_options',
+        { tool1: { defer_loading: true } },
+        { shouldDirty: true },
+      );
+    });
+  });
+
+  describe('formToolOptions', () => {
+    it('should return undefined when useWatch returns undefined', () => {
+      (useWatch as jest.Mock).mockReturnValue(undefined);
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.formToolOptions).toBeUndefined();
+    });
+
+    it('should return the tool options from useWatch', () => {
+      const toolOptions = {
+        tool1: { defer_loading: true },
+        tool2: { allowed_callers: ['code_execution'] },
+      };
+      (useWatch as jest.Mock).mockReturnValue(toolOptions);
+
+      const { result } = renderHook(() => useMCPToolOptions());
+
+      expect(result.current.formToolOptions).toEqual(toolOptions);
+    });
+  });
+});
diff --git a/client/src/hooks/Agents/index.ts b/client/src/hooks/Agents/index.ts
index 3597b0e646..f75d045cc0 100644
--- a/client/src/hooks/Agents/index.ts
+++ b/client/src/hooks/Agents/index.ts
@@ -6,4 +6,5 @@ export { default as useAgentCapabilities } from './useAgentCapabilities';
 export { default as useGetAgentsConfig } from './useGetAgentsConfig';
 export { default as useAgentDefaultPermissionLevel } from './useAgentDefaultPermissionLevel';
 export { default as useAgentToolPermissions } from './useAgentToolPermissions';
+export { default as useMCPToolOptions } from './useMCPToolOptions';
 export * from './useApplyModelSpecAgents';
diff --git a/client/src/hooks/Agents/useAgentCapabilities.ts b/client/src/hooks/Agents/useAgentCapabilities.ts
index 8d2bd6ef87..a0f3de025e 100644
--- a/client/src/hooks/Agents/useAgentCapabilities.ts
+++ b/client/src/hooks/Agents/useAgentCapabilities.ts
@@ -10,6 +10,8 @@ interface AgentCapabilitiesResult {
   fileSearchEnabled: boolean;
   webSearchEnabled: boolean;
   codeEnabled: boolean;
+  deferredToolsEnabled: boolean;
+  programmaticToolsEnabled: boolean;
 }
 
 export default function useAgentCapabilities(
@@ -55,6 +57,16 @@ export default function useAgentCapabilities(
     [capabilities],
   );
 
+  const deferredToolsEnabled = useMemo(
+    () => capabilities?.includes(AgentCapabilities.deferred_tools) ?? false,
+    [capabilities],
+  );
+
+  const programmaticToolsEnabled = useMemo(
+    () => capabilities?.includes(AgentCapabilities.programmatic_tools) ?? false,
+    [capabilities],
+  );
+
   return {
     ocrEnabled,
     codeEnabled,
@@ -64,5 +76,7 @@ export default function useAgentCapabilities(
     artifactsEnabled,
     webSearchEnabled,
     fileSearchEnabled,
+    deferredToolsEnabled,
+    programmaticToolsEnabled,
   };
 }
diff --git a/client/src/hooks/Agents/useApplyModelSpecAgents.ts b/client/src/hooks/Agents/useApplyModelSpecAgents.ts
index 94d62a058a..2c677f85ca 100644
--- a/client/src/hooks/Agents/useApplyModelSpecAgents.ts
+++ b/client/src/hooks/Agents/useApplyModelSpecAgents.ts
@@ -1,4 +1,5 @@
 import { useCallback } from 'react';
+import { Constants } from 'librechat-data-provider';
 import type { TStartupConfig, TSubmission } from 'librechat-data-provider';
 import { useUpdateEphemeralAgent, useApplyNewAgentTemplate } from '~/store/agents';
 import { getModelSpec, applyModelSpecEphemeralAgent } from '~/utils';
@@ -6,6 +7,10 @@ import { getModelSpec, applyModelSpecEphemeralAgent } from '~/utils';
 /**
  * Hook that applies a model spec from a preset to an ephemeral agent.
  * This is used when initializing a new conversation with a preset that has a spec.
+ *
+ * When a spec is provided, its tool settings are applied to the ephemeral agent.
+ * When no spec is provided but specs are configured, the ephemeral agent is reset
+ * to null so BadgeRowContext can apply localStorage defaults (non-spec experience).
  */
 export function useApplyModelSpecEffects() {
   const updateEphemeralAgent = useUpdateEphemeralAgent();
@@ -20,6 +25,11 @@ export function useApplyModelSpecEffects() {
       startupConfig?: TStartupConfig;
     }) => {
       if (specName == null || !specName) {
+        if (startupConfig?.modelSpecs?.list?.length) {
+          /** Specs are configured but none selected — reset ephemeral agent to null
+           *  so BadgeRowContext fills all values (tool toggles + MCP) from localStorage. */
+          updateEphemeralAgent((convoId ?? Constants.NEW_CONVO) || Constants.NEW_CONVO, null);
+        }
         return;
       }
 
@@ -80,6 +90,9 @@ export function useApplyAgentTemplate() {
         web_search: ephemeralAgent?.web_search ?? modelSpec.webSearch ?? false,
         file_search: ephemeralAgent?.file_search ?? modelSpec.fileSearch ?? false,
         execute_code: ephemeralAgent?.execute_code ?? modelSpec.executeCode ?? false,
+        artifacts:
+          ephemeralAgent?.artifacts ??
+          (modelSpec.artifacts === true ? 'default' : modelSpec.artifacts || ''),
       };
 
       mergedAgent.mcp = [...new Set(mergedAgent.mcp)];
diff --git a/client/src/hooks/Agents/useMCPToolOptions.ts b/client/src/hooks/Agents/useMCPToolOptions.ts
new file mode 100644
index 0000000000..68cfb8f91b
--- /dev/null
+++ b/client/src/hooks/Agents/useMCPToolOptions.ts
@@ -0,0 +1,183 @@
+import { useCallback } from 'react';
+import { useFormContext, useWatch } from 'react-hook-form';
+import type { AgentToolOptions, AllowedCaller, AgentToolType } from 'librechat-data-provider';
+import type { AgentForm } from '~/common';
+
+interface UseMCPToolOptionsReturn {
+  formToolOptions: AgentToolOptions | undefined;
+  isToolDeferred: (toolId: string) => boolean;
+  isToolProgrammatic: (toolId: string) => boolean;
+  toggleToolDefer: (toolId: string) => void;
+  toggleToolProgrammatic: (toolId: string) => void;
+  areAllToolsDeferred: (tools: AgentToolType[]) => boolean;
+  areAllToolsProgrammatic: (tools: AgentToolType[]) => boolean;
+  toggleDeferAll: (tools: AgentToolType[]) => void;
+  toggleProgrammaticAll: (tools: AgentToolType[]) => void;
+}
+
+export default function useMCPToolOptions(): UseMCPToolOptionsReturn {
+  const { getValues, setValue, control } = useFormContext<AgentForm>();
+  const formToolOptions = useWatch({ control, name: 'tool_options' });
+
+  const isToolDeferred = useCallback(
+    (toolId: string): boolean => formToolOptions?.[toolId]?.defer_loading === true,
+    [formToolOptions],
+  );
+
+  const isToolProgrammatic = useCallback(
+    (toolId: string): boolean =>
+      formToolOptions?.[toolId]?.allowed_callers?.includes('code_execution') === true,
+    [formToolOptions],
+  );
+
+  const toggleToolDefer = useCallback(
+    (toolId: string) => {
+      const currentOptions = getValues('tool_options') || {};
+      const currentToolOptions = currentOptions[toolId] || {};
+      const newDeferred = !currentToolOptions.defer_loading;
+
+      const updatedOptions: AgentToolOptions = { ...currentOptions };
+
+      if (newDeferred) {
+        updatedOptions[toolId] = {
+          ...currentToolOptions,
+          defer_loading: true,
+        };
+      } else {
+        const { defer_loading: _, ...restOptions } = currentToolOptions;
+        if (Object.keys(restOptions).length === 0) {
+          delete updatedOptions[toolId];
+        } else {
+          updatedOptions[toolId] = restOptions;
+        }
+      }
+
+      setValue('tool_options', updatedOptions, { shouldDirty: true });
+    },
+    [getValues, setValue],
+  );
+
+  const toggleToolProgrammatic = useCallback(
+    (toolId: string) => {
+      const currentOptions = getValues('tool_options') || {};
+      const currentToolOptions = currentOptions[toolId] || {};
+      const currentCallers = currentToolOptions.allowed_callers || [];
+      const isProgrammatic = currentCallers.includes('code_execution');
+
+      const updatedOptions: AgentToolOptions = { ...currentOptions };
+
+      if (isProgrammatic) {
+        const newCallers = currentCallers.filter((c: AllowedCaller) => c !== 'code_execution');
+        if (newCallers.length === 0) {
+          const { allowed_callers: _, ...restOptions } = currentToolOptions;
+          if (Object.keys(restOptions).length === 0) {
+            delete updatedOptions[toolId];
+          } else {
+            updatedOptions[toolId] = restOptions;
+          }
+        } else {
+          updatedOptions[toolId] = {
+            ...currentToolOptions,
+            allowed_callers: newCallers,
+          };
+        }
+      } else {
+        updatedOptions[toolId] = {
+          ...currentToolOptions,
+          allowed_callers: ['code_execution'] as AllowedCaller[],
+        };
+      }
+
+      setValue('tool_options', updatedOptions, { shouldDirty: true });
+    },
+    [getValues, setValue],
+  );
+
+  const areAllToolsDeferred = useCallback(
+    (tools: AgentToolType[]): boolean =>
+      tools.length > 0 &&
+      tools.every((tool) => formToolOptions?.[tool.tool_id]?.defer_loading === true),
+    [formToolOptions],
+  );
+
+  const areAllToolsProgrammatic = useCallback(
+    (tools: AgentToolType[]): boolean =>
+      tools.length > 0 &&
+      tools.every(
+        (tool) =>
+          formToolOptions?.[tool.tool_id]?.allowed_callers?.includes('code_execution') === true,
+      ),
+    [formToolOptions],
+  );
+
+  const toggleDeferAll = useCallback(
+    (tools: AgentToolType[]) => {
+      if (tools.length === 0) return;
+
+      const shouldDefer = !areAllToolsDeferred(tools);
+      const currentOptions = getValues('tool_options') || {};
+      const updatedOptions: AgentToolOptions = { ...currentOptions };
+
+      for (const tool of tools) {
+        if (shouldDefer) {
+          updatedOptions[tool.tool_id] = {
+            ...(updatedOptions[tool.tool_id] || {}),
+            defer_loading: true,
+          };
+        } else {
+          if (updatedOptions[tool.tool_id]) {
+            delete updatedOptions[tool.tool_id].defer_loading;
+            if (Object.keys(updatedOptions[tool.tool_id]).length === 0) {
+              delete updatedOptions[tool.tool_id];
+            }
+          }
+        }
+      }
+
+      setValue('tool_options', updatedOptions, { shouldDirty: true });
+    },
+    [getValues, setValue, areAllToolsDeferred],
+  );
+
+  const toggleProgrammaticAll = useCallback(
+    (tools: AgentToolType[]) => {
+      if (tools.length === 0) return;
+
+      const shouldBeProgrammatic = !areAllToolsProgrammatic(tools);
+      const currentOptions = getValues('tool_options') || {};
+      const updatedOptions: AgentToolOptions = { ...currentOptions };
+
+      for (const tool of tools) {
+        const currentToolOptions = updatedOptions[tool.tool_id] || {};
+        if (shouldBeProgrammatic) {
+          updatedOptions[tool.tool_id] = {
+            ...currentToolOptions,
+            allowed_callers: ['code_execution'] as AllowedCaller[],
+          };
+        } else {
+          if (updatedOptions[tool.tool_id]) {
+            delete updatedOptions[tool.tool_id].allowed_callers;
+            if (Object.keys(updatedOptions[tool.tool_id]).length === 0) {
+              delete updatedOptions[tool.tool_id];
+            }
+          }
+        }
+      }
+
+      setValue('tool_options', updatedOptions, { shouldDirty: true });
+    },
+    [getValues, setValue, areAllToolsProgrammatic],
+  );
+
+  return {
+    formToolOptions,
+    isToolDeferred,
+    isToolProgrammatic,
+    toggleToolDefer,
+    toggleToolProgrammatic,
+    areAllToolsDeferred,
+    areAllToolsProgrammatic,
+    toggleDeferAll,
+    toggleProgrammaticAll,
+  };
+}
diff --git a/client/src/hooks/Chat/useAddedResponse.ts b/client/src/hooks/Chat/useAddedResponse.ts
index c01cef0c69..fe35e4e56e 100644
--- a/client/src/hooks/Chat/useAddedResponse.ts
+++ b/client/src/hooks/Chat/useAddedResponse.ts
@@ -1,7 +1,12 @@
 import { useCallback } from 'react';
 import { useRecoilValue } from 'recoil';
 import { useGetModelsQuery } from 'librechat-data-provider/react-query';
-import { getEndpointField, LocalStorageKeys, isAssistantsEndpoint } from 'librechat-data-provider';
+import {
+  getEndpointField,
+  LocalStorageKeys,
+  isAssistantsEndpoint,
+  getDefaultParamsEndpoint,
+} from 'librechat-data-provider';
 import type { TEndpointsConfig, EModelEndpoint, TConversation } from 'librechat-data-provider';
 import type { AssistantListItem, NewConversationParams } from '~/common';
 import useAssistantListMap from '~/hooks/Assistants/useAssistantListMap';
@@ -84,11 +89,13 @@ export default function useAddedResponse() {
       }
 
       const models = modelsConfig?.[defaultEndpoint ?? ''] ?? [];
+      const defaultParamsEndpoint = getDefaultParamsEndpoint(endpointsConfig, defaultEndpoint);
       newConversation = buildDefaultConvo({
         conversation: newConversation,
         lastConversationSetup: preset as TConversation,
         endpoint: defaultEndpoint ?? ('' as EModelEndpoint),
         models,
+        defaultParamsEndpoint,
       });
 
       if (preset?.title != null && preset.title !== '') {
diff --git a/client/src/hooks/Chat/useChatFunctions.ts b/client/src/hooks/Chat/useChatFunctions.ts
index 8479d8eaac..7cf8c6bf25 100644
--- a/client/src/hooks/Chat/useChatFunctions.ts
+++ b/client/src/hooks/Chat/useChatFunctions.ts
@@ -13,6 +13,7 @@ import {
   parseCompactConvo,
   replaceSpecialVars,
   isAssistantsEndpoint,
+  getDefaultParamsEndpoint,
 } from 'librechat-data-provider';
 import type {
   TMessage,
@@ -96,6 +97,8 @@ export default function useChatFunctions({
   ) => {
     setShowStopButton(false);
     resetLatestMultiMessage();
+
+    text = text.trim();
     if (!!isSubmitting || text === '') {
       return;
     }
@@ -133,7 +136,6 @@ export default function useChatFunctions({
 
     // construct the query message
     // this is not a real messageId, it is used as placeholder before real messageId returned
-    text = text.trim();
     const intermediateId = overrideUserMessageId ?? v4();
     parentMessageId = parentMessageId ?? latestMessage?.messageId ?? Constants.NO_PARENT;
 
@@ -173,12 +175,14 @@ export default function useChatFunctions({
     const startupConfig = queryClient.getQueryData<TStartupConfig>([QueryKeys.startupConfig]);
     const endpointType = getEndpointField(endpointsConfig, endpoint, 'type');
     const iconURL = conversation?.iconURL;
+    const defaultParamsEndpoint = getDefaultParamsEndpoint(endpointsConfig, endpoint);
 
     /** This becomes part of the `endpointOption` */
     const convo = parseCompactConvo({
       endpoint: endpoint as EndpointSchemaKey,
       endpointType: endpointType as EndpointSchemaKey,
       conversation: conversation ?? {},
+      defaultParamsEndpoint,
     });
 
     const { modelDisplayLabel } = endpointsConfig?.[endpoint ?? ''] ?? {};
diff --git a/client/src/hooks/Conversations/useDefaultConvo.ts b/client/src/hooks/Conversations/useDefaultConvo.ts
index bfca39d3e0..67a40ce64e 100644
--- a/client/src/hooks/Conversations/useDefaultConvo.ts
+++ b/client/src/hooks/Conversations/useDefaultConvo.ts
@@ -1,5 +1,5 @@
-import { excludedKeys } from 'librechat-data-provider';
 import { useGetModelsQuery } from 'librechat-data-provider/react-query';
+import { excludedKeys, getDefaultParamsEndpoint } from 'librechat-data-provider';
 import type {
   TEndpointsConfig,
   TModelsConfig,
@@ -47,11 +47,14 @@ const useDefaultConvo = () => {
       }
     }
 
+    const defaultParamsEndpoint = getDefaultParamsEndpoint(endpointsConfig, endpoint);
+
     const defaultConvo = buildDefaultConvo({
       conversation: conversation as TConversation,
       endpoint,
       lastConversationSetup: preset as TConversation,
       models,
+      defaultParamsEndpoint,
     });
 
     if (!cleanOutput) {
diff --git a/client/src/hooks/Conversations/useExportConversation.ts b/client/src/hooks/Conversations/useExportConversation.ts
index 579b5f1cf6..dc352ccab9 100644
--- a/client/src/hooks/Conversations/useExportConversation.ts
+++ b/client/src/hooks/Conversations/useExportConversation.ts
@@ -106,6 +106,9 @@ export default function useExportConversation({
       // TEXT
       const textPart = content[ContentTypes.TEXT];
       const text = typeof textPart === 'string' ? textPart : (textPart?.value ?? '');
+      if (text.trim().length === 0) {
+        return [];
+      }
       return [sender, text];
     }
 
diff --git a/client/src/hooks/Conversations/useGenerateConvo.ts b/client/src/hooks/Conversations/useGenerateConvo.ts
index d96f60e05d..abe3215753 100644
--- a/client/src/hooks/Conversations/useGenerateConvo.ts
+++ b/client/src/hooks/Conversations/useGenerateConvo.ts
@@ -1,7 +1,12 @@
 import { useRecoilValue } from 'recoil';
 import { useCallback, useRef, useEffect } from 'react';
 import { useGetModelsQuery } from 'librechat-data-provider/react-query';
-import { getEndpointField, LocalStorageKeys, isAssistantsEndpoint } from 'librechat-data-provider';
+import {
+  getEndpointField,
+  LocalStorageKeys,
+  isAssistantsEndpoint,
+  getDefaultParamsEndpoint,
+} from 'librechat-data-provider';
 import type {
   TEndpointsConfig,
   EModelEndpoint,
@@ -117,11 +122,13 @@ const useGenerateConvo = ({
       }
 
       const models = modelsConfig?.[defaultEndpoint ?? ''] ?? [];
+      const defaultParamsEndpoint = getDefaultParamsEndpoint(endpointsConfig, defaultEndpoint);
       conversation = buildDefaultConvo({
         conversation,
         lastConversationSetup: preset as TConversation,
         endpoint: defaultEndpoint ?? ('' as EModelEndpoint),
         models,
+        defaultParamsEndpoint,
       });
 
       if (preset?.title != null && preset.title !== '') {
diff --git a/client/src/hooks/Conversations/useNavigateToConvo.tsx b/client/src/hooks/Conversations/useNavigateToConvo.tsx
index 114b70c6ef..b9d188eaf0 100644
--- a/client/src/hooks/Conversations/useNavigateToConvo.tsx
+++ b/client/src/hooks/Conversations/useNavigateToConvo.tsx
@@ -2,7 +2,13 @@ import { useCallback } from 'react';
 import { useSetRecoilState } from 'recoil';
 import { useNavigate } from 'react-router-dom';
 import { useQueryClient } from '@tanstack/react-query';
-import { QueryKeys, Constants, dataService, getEndpointField } from 'librechat-data-provider';
+import {
+  QueryKeys,
+  Constants,
+  dataService,
+  getEndpointField,
+  getDefaultParamsEndpoint,
+} from 'librechat-data-provider';
 import type {
   TEndpointsConfig,
   TStartupConfig,
@@ -106,11 +112,13 @@ const useNavigateToConvo = (index = 0) => {
 
       const models = modelsConfig?.[defaultEndpoint ?? ''] ?? [];
 
+      const defaultParamsEndpoint = getDefaultParamsEndpoint(endpointsConfig, defaultEndpoint);
       convo = buildDefaultConvo({
         models,
         conversation,
         endpoint: defaultEndpoint,
         lastConversationSetup: conversation,
+        defaultParamsEndpoint,
       });
     }
     clearAllConversations(true);
diff --git a/client/src/hooks/Endpoint/UnknownIcon.tsx b/client/src/hooks/Endpoint/UnknownIcon.tsx
index 20619e0b7d..be7531a34a 100644
--- a/client/src/hooks/Endpoint/UnknownIcon.tsx
+++ b/client/src/hooks/Endpoint/UnknownIcon.tsx
@@ -1,6 +1,6 @@
 import { memo } from 'react';
-import { CustomMinimalIcon, XAIcon } from '@librechat/client';
 import { EModelEndpoint, KnownEndpoints } from 'librechat-data-provider';
+import { CustomMinimalIcon, XAIcon, MoonshotIcon } from '@librechat/client';
 import { IconContext } from '~/common';
 import { cn } from '~/utils';
 
@@ -30,9 +30,6 @@ const knownEndpointClasses = {
   [KnownEndpoints.cohere]: {
     [IconContext.landing]: 'p-2',
   },
-  [KnownEndpoints.xai]: {
-    [IconContext.landing]: 'p-2',
-  },
 };
 
 const getKnownClass = ({
@@ -73,15 +70,11 @@ function UnknownIcon({
   const currentEndpoint = endpoint.toLowerCase();
 
   if (currentEndpoint === KnownEndpoints.xai) {
-    return (
-      <XAIcon
-        className={getKnownClass({
-          currentEndpoint,
-          context: context,
-          className,
-        })}
-      />
-    );
+    return <XAIcon className={cn(className, 'text-black dark:text-white')} />;
+  }
+
+  if (currentEndpoint === KnownEndpoints.moonshot) {
+    return <MoonshotIcon className={cn(className, 'text-black dark:text-white')} />;
   }
 
   if (iconURL) {
diff --git a/client/src/hooks/MCP/__tests__/useMCPSelect.test.tsx b/client/src/hooks/MCP/__tests__/useMCPSelect.test.tsx
index 26595b611c..783f525b9c 100644
--- a/client/src/hooks/MCP/__tests__/useMCPSelect.test.tsx
+++ b/client/src/hooks/MCP/__tests__/useMCPSelect.test.tsx
@@ -415,7 +415,7 @@ describe('useMCPSelect', () => {
       });
     });
 
-    it('should handle empty ephemeralAgent.mcp array correctly', async () => {
+    it('should clear mcpValues when ephemeralAgent.mcp is set to empty array', async () => {
       // Create a shared wrapper
       const { Wrapper, servers } = createWrapper(['initial-value']);
 
@@ -437,19 +437,21 @@ describe('useMCPSelect', () => {
         expect(result.current.mcpHook.mcpValues).toEqual(['initial-value']);
       });
 
-      // Try to set empty array externally
+      // Set empty array externally (e.g., spec with no MCP servers)
       act(() => {
         result.current.setEphemeralAgent({
           mcp: [],
         });
       });
 
-      // Values should remain unchanged since empty mcp array doesn't trigger update
-      // (due to the condition: ephemeralAgent?.mcp && ephemeralAgent.mcp.length > 0)
-      expect(result.current.mcpHook.mcpValues).toEqual(['initial-value']);
+      // Jotai atom should be cleared — an explicit empty mcp array means
+      // the spec (or reset) has no MCP servers, so the visual selection must clear
+      await waitFor(() => {
+        expect(result.current.mcpHook.mcpValues).toEqual([]);
+      });
     });
 
-    it('should handle ephemeralAgent with clear mcp value', async () => {
+    it('should handle ephemeralAgent being reset to null', async () => {
       // Create a shared wrapper
       const { Wrapper, servers } = createWrapper(['server1', 'server2']);
 
@@ -471,16 +473,15 @@ describe('useMCPSelect', () => {
         expect(result.current.mcpHook.mcpValues).toEqual(['server1', 'server2']);
       });
 
-      // Set ephemeralAgent with clear value
+      // Reset ephemeralAgent to null (simulating non-spec reset)
       act(() => {
-        result.current.setEphemeralAgent({
-          mcp: [Constants.mcp_clear as string],
-        });
+        result.current.setEphemeralAgent(null);
       });
 
-      // mcpValues should be cleared
+      // mcpValues should remain unchanged since null ephemeral agent
+      // doesn't trigger the sync effect (mcps.length === 0)
       await waitFor(() => {
-        expect(result.current.mcpHook.mcpValues).toEqual([]);
+        expect(result.current.mcpHook.mcpValues).toEqual(['server1', 'server2']);
       });
     });
 
@@ -590,6 +591,233 @@ describe('useMCPSelect', () => {
     });
   });
 
+  describe('Environment-Keyed Storage (storageContextKey)', () => {
+    it('should use storageContextKey as atom key for new conversations', async () => {
+      const { Wrapper, servers } = createWrapper(['server1', 'server2']);
+      const storageContextKey = '__defaults__';
+
+      // Hook A: new conversation with storageContextKey
+      const { result: resultA } = renderHook(
+        () => useMCPSelect({ conversationId: null, storageContextKey, servers }),
+        { wrapper: Wrapper },
+      );
+
+      act(() => {
+        resultA.current.setMCPValues(['server1']);
+      });
+
+      await waitFor(() => {
+        expect(resultA.current.mcpValues).toEqual(['server1']);
+      });
+
+      // Hook B: new conversation WITHOUT storageContextKey (different environment)
+      const { result: resultB } = renderHook(
+        () => useMCPSelect({ conversationId: null, servers }),
+        { wrapper: Wrapper },
+      );
+
+      // Should NOT see server1 since it's a different atom (NEW_CONVO vs __defaults__)
+      expect(resultB.current.mcpValues).toEqual([]);
+    });
+
+    it('should use conversationId as atom key for existing conversations even with storageContextKey', async () => {
+      const conversationId = 'existing-convo-123';
+      const { Wrapper, servers } = createWrapper(['server1', 'server2']);
+      const storageContextKey = '__defaults__';
+
+      const { result } = renderHook(
+        () => useMCPSelect({ conversationId, storageContextKey, servers }),
+        { wrapper: Wrapper },
+      );
+
+      act(() => {
+        result.current.setMCPValues(['server1', 'server2']);
+      });
+
+      await waitFor(() => {
+        expect(result.current.mcpValues).toEqual(['server1', 'server2']);
+      });
+
+      // Verify timestamp was written to the conversation key, not the environment key
+      const convoKey = `${LocalStorageKeys.LAST_MCP_}${conversationId}`;
+      expect(setTimestamp).toHaveBeenCalledWith(convoKey);
+    });
+
+    it('should dual-write to environment key when storageContextKey is provided', async () => {
+      const { Wrapper, servers } = createWrapper(['server1', 'server2']);
+      const storageContextKey = '__defaults__';
+
+      const { result } = renderHook(
+        () => useMCPSelect({ conversationId: null, storageContextKey, servers }),
+        { wrapper: Wrapper },
+      );
+
+      act(() => {
+        result.current.setMCPValues(['server1', 'server2']);
+      });
+
+      await waitFor(() => {
+        // Verify dual-write to environment key
+        const envKey = `${LocalStorageKeys.LAST_MCP_}${storageContextKey}`;
+        expect(localStorage.getItem(envKey)).toEqual(JSON.stringify(['server1', 'server2']));
+        expect(setTimestamp).toHaveBeenCalledWith(envKey);
+      });
+    });
+
+    it('should NOT dual-write when storageContextKey is undefined', async () => {
+      const conversationId = 'convo-no-specs';
+      const { Wrapper, servers } = createWrapper(['server1']);
+
+      const { result } = renderHook(() => useMCPSelect({ conversationId, servers }), {
+        wrapper: Wrapper,
+      });
+
+      act(() => {
+        result.current.setMCPValues(['server1']);
+      });
+
+      await waitFor(() => {
+        expect(result.current.mcpValues).toEqual(['server1']);
+      });
+
+      // Only the conversation-keyed timestamp should be set, no environment key
+      const envKey = `${LocalStorageKeys.LAST_MCP_}__defaults__`;
+      expect(localStorage.getItem(envKey)).toBeNull();
+    });
+
+    it('should isolate per-conversation state from environment defaults', async () => {
+      const { Wrapper, servers } = createWrapper(['server1', 'server2', 'server3']);
+      const storageContextKey = '__defaults__';
+
+      // Set environment defaults via new conversation
+      const { result: newConvoResult } = renderHook(
+        () => useMCPSelect({ conversationId: null, storageContextKey, servers }),
+        { wrapper: Wrapper },
+      );
+
+      act(() => {
+        newConvoResult.current.setMCPValues(['server1', 'server2']);
+      });
+
+      await waitFor(() => {
+        expect(newConvoResult.current.mcpValues).toEqual(['server1', 'server2']);
+      });
+
+      // Existing conversation should have its own isolated state
+      const { result: existingResult } = renderHook(
+        () => useMCPSelect({ conversationId: 'existing-convo', storageContextKey, servers }),
+        { wrapper: Wrapper },
+      );
+
+      // Should start empty (its own atom), not inherit from defaults
+      expect(existingResult.current.mcpValues).toEqual([]);
+
+      // Set different value for existing conversation
+      act(() => {
+        existingResult.current.setMCPValues(['server3']);
+      });
+
+      await waitFor(() => {
+        expect(existingResult.current.mcpValues).toEqual(['server3']);
+      });
+
+      // New conversation defaults should be unchanged
+      expect(newConvoResult.current.mcpValues).toEqual(['server1', 'server2']);
+    });
+  });
+
+  describe('Spec/Non-Spec Context Switching', () => {
+    it('should clear MCP when ephemeral agent switches to empty mcp (spec with no MCP)', async () => {
+      const { Wrapper, servers } = createWrapper(['server1', 'server2']);
+      const storageContextKey = '__defaults__';
+
+      const TestComponent = ({ ctxKey }: { ctxKey?: string }) => {
+        const mcpHook = useMCPSelect({ conversationId: null, storageContextKey: ctxKey, servers });
+        const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(Constants.NEW_CONVO));
+        return { mcpHook, setEphemeralAgent };
+      };
+
+      // Start in non-spec context with some servers selected
+      const { result } = renderHook(() => TestComponent({ ctxKey: storageContextKey }), {
+        wrapper: Wrapper,
+      });
+
+      act(() => {
+        result.current.mcpHook.setMCPValues(['server1', 'server2']);
+      });
+
+      await waitFor(() => {
+        expect(result.current.mcpHook.mcpValues).toEqual(['server1', 'server2']);
+      });
+
+      // Simulate switching to a spec with no MCP — ephemeral agent gets mcp: []
+      act(() => {
+        result.current.setEphemeralAgent({ mcp: [] });
+      });
+
+      // MCP values should clear since the spec explicitly has no MCP servers
+      await waitFor(() => {
+        expect(result.current.mcpHook.mcpValues).toEqual([]);
+      });
+    });
+
+    it('should handle ephemeral agent with spec MCP servers syncing to Jotai atom', async () => {
+      const { Wrapper, servers } = createWrapper(['spec-server1', 'spec-server2']);
+
+      const TestComponent = () => {
+        const mcpHook = useMCPSelect({ conversationId: null, servers });
+        const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(Constants.NEW_CONVO));
+        return { mcpHook, setEphemeralAgent };
+      };
+
+      const { result } = renderHook(() => TestComponent(), { wrapper: Wrapper });
+
+      // Simulate spec application setting ephemeral agent MCP
+      act(() => {
+        result.current.setEphemeralAgent({
+          mcp: ['spec-server1', 'spec-server2'],
+          execute_code: true,
+        });
+      });
+
+      await waitFor(() => {
+        expect(result.current.mcpHook.mcpValues).toEqual(['spec-server1', 'spec-server2']);
+      });
+    });
+
+    it('should handle null ephemeral agent reset (non-spec with specs configured)', async () => {
+      const { Wrapper, servers } = createWrapper(['server1', 'server2']);
+
+      const TestComponent = () => {
+        const mcpHook = useMCPSelect({ servers });
+        const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(Constants.NEW_CONVO));
+        return { mcpHook, setEphemeralAgent };
+      };
+
+      const { result } = renderHook(() => TestComponent(), { wrapper: Wrapper });
+
+      // Set values from a spec
+      act(() => {
+        result.current.setEphemeralAgent({ mcp: ['server1', 'server2'] });
+      });
+
+      await waitFor(() => {
+        expect(result.current.mcpHook.mcpValues).toEqual(['server1', 'server2']);
+      });
+
+      // Reset ephemeral agent to null (switching to non-spec)
+      act(() => {
+        result.current.setEphemeralAgent(null);
+      });
+
+      // mcpValues should remain unchanged — null ephemeral agent doesn't trigger sync
+      // (BadgeRowContext will fill from localStorage defaults separately)
+      await waitFor(() => {
+        expect(result.current.mcpHook.mcpValues).toEqual(['server1', 'server2']);
+      });
+    });
+  });
+
   describe('Memory Leak Prevention', () => {
     it('should not leak memory on repeated updates', async () => {
       const values = Array.from({ length: 100 }, (_, i) => `value-${i}`);
diff --git a/client/src/hooks/MCP/useMCPSelect.ts b/client/src/hooks/MCP/useMCPSelect.ts
index ec9dfe0bbb..b15786f678 100644
--- a/client/src/hooks/MCP/useMCPSelect.ts
+++ b/client/src/hooks/MCP/useMCPSelect.ts
@@ -9,9 +9,11 @@ import { MCPServerDefinition } from './useMCPServerManager';
 
 export function useMCPSelect({
   conversationId,
+  storageContextKey,
   servers,
 }: {
   conversationId?: string | null;
+  storageContextKey?: string;
   servers: MCPServerDefinition[];
 }) {
   const key = conversationId ?? Constants.NEW_CONVO;
@@ -19,47 +21,61 @@ export function useMCPSelect({
     return new Set(servers?.map((s) => s.serverName));
   }, [servers]);
 
+  /**
+   * For new conversations, key the MCP atom by environment (spec or defaults)
+   * so switching between spec ↔ non-spec gives each its own atom.
+   * For existing conversations, key by conversation ID for per-conversation isolation.
+   */
+  const isNewConvo = key === Constants.NEW_CONVO;
+  const mcpAtomKey = isNewConvo && storageContextKey ? storageContextKey : key;
+
   const [isPinned, setIsPinned] = useAtom(mcpPinnedAtom);
-  const [mcpValues, setMCPValuesRaw] = useAtom(mcpValuesAtomFamily(key));
+  const [mcpValues, setMCPValuesRaw] = useAtom(mcpValuesAtomFamily(mcpAtomKey));
   const [ephemeralAgent, setEphemeralAgent] = useRecoilState(ephemeralAgentByConvoId(key));
 
-  // Sync Jotai state with ephemeral agent state
+  // Sync ephemeral agent MCP → Jotai atom (strip unconfigured servers)
   useEffect(() => {
-    const mcps = ephemeralAgent?.mcp ?? [];
-    if (mcps.length === 1 && mcps[0] === Constants.mcp_clear) {
-      setMCPValuesRaw([]);
-    } else if (mcps.length > 0) {
-      // Strip out servers that are not available in the startup config
+    const mcps = ephemeralAgent?.mcp;
+    if (Array.isArray(mcps) && mcps.length > 0 && configuredServers.size > 0) {
       const activeMcps = mcps.filter((mcp) => configuredServers.has(mcp));
-      setMCPValuesRaw(activeMcps);
-    }
-  }, [ephemeralAgent?.mcp, setMCPValuesRaw, configuredServers]);
-
-  useEffect(() => {
-    setEphemeralAgent((prev) => {
-      if (!isEqual(prev?.mcp, mcpValues)) {
-        return { ...(prev ?? {}), mcp: mcpValues };
+      if (!isEqual(activeMcps, mcpValues)) {
+        setMCPValuesRaw(activeMcps);
       }
-      return prev;
-    });
-  }, [mcpValues, setEphemeralAgent]);
+    } else if (Array.isArray(mcps) && mcps.length === 0 && mcpValues.length > 0) {
+      // Ephemeral agent explicitly has empty MCP (e.g., spec with no MCP servers) — clear atom
+      setMCPValuesRaw([]);
+    }
+  }, [ephemeralAgent?.mcp, setMCPValuesRaw, configuredServers, mcpValues]);
 
+  // Write timestamp when MCP values change
   useEffect(() => {
-    const mcpStorageKey = `${LocalStorageKeys.LAST_MCP_}${key}`;
+    const mcpStorageKey = `${LocalStorageKeys.LAST_MCP_}${mcpAtomKey}`;
     if (mcpValues.length > 0) {
       setTimestamp(mcpStorageKey);
     }
-  }, [mcpValues, key]);
+  }, [mcpValues, mcpAtomKey]);
 
-  /** Stable memoized setter */
+  /** Stable memoized setter with dual-write to environment key */
   const setMCPValues = useCallback(
     (value: string[]) => {
       if (!Array.isArray(value)) {
         return;
       }
       setMCPValuesRaw(value);
+      setEphemeralAgent((prev) => {
+        if (!isEqual(prev?.mcp, value)) {
+          return { ...(prev ?? {}), mcp: value };
+        }
+        return prev;
+      });
+      // Dual-write to environment key for new conversation defaults
+      if (storageContextKey) {
+        const envKey = `${LocalStorageKeys.LAST_MCP_}${storageContextKey}`;
+        localStorage.setItem(envKey, JSON.stringify(value));
+        setTimestamp(envKey);
+      }
     },
-    [setMCPValuesRaw],
+    [setMCPValuesRaw, setEphemeralAgent, storageContextKey],
   );
 
   return {
diff --git a/client/src/hooks/MCP/useMCPServerManager.ts b/client/src/hooks/MCP/useMCPServerManager.ts
index bb5214be7c..af65ba4507 100644
--- a/client/src/hooks/MCP/useMCPServerManager.ts
+++ b/client/src/hooks/MCP/useMCPServerManager.ts
@@ -28,7 +28,10 @@ export interface MCPServerDefinition {
 // The init states (isInitializing, isCancellable, etc.) are stored in the global Jotai atom
 type PollIntervals = Record<string, NodeJS.Timeout | null>;
 
-export function useMCPServerManager({ conversationId }: { conversationId?: string | null } = {}) {
+export function useMCPServerManager({
+  conversationId,
+  storageContextKey,
+}: { conversationId?: string | null; storageContextKey?: string } = {}) {
   const localize = useLocalize();
   const queryClient = useQueryClient();
   const { showToast } = useToastContext();
@@ -73,6 +76,7 @@ export function useMCPServerManager({ conversationId }: { conversationId?: strin
 
   const { mcpValues, setMCPValues, isPinned, setIsPinned } = useMCPSelect({
     conversationId,
+    storageContextKey,
     servers: selectableServers,
   });
   const mcpValuesRef = useRef(mcpValues);
@@ -429,33 +433,6 @@ export function useMCPServerManager({ conversationId }: { conversationId?: strin
     [startupConfig?.interface?.mcpServers?.placeholder, localize],
   );
 
-  const batchToggleServers = useCallback(
-    (serverNames: string[]) => {
-      const connectedServers: string[] = [];
-      const disconnectedServers: string[] = [];
-
-      serverNames.forEach((serverName) => {
-        if (isInitializing(serverName)) {
-          return;
-        }
-
-        const serverStatus = connectionStatus?.[serverName];
-        if (serverStatus?.connectionState === 'connected') {
-          connectedServers.push(serverName);
-        } else {
-          disconnectedServers.push(serverName);
-        }
-      });
-
-      setMCPValues(connectedServers);
-
-      disconnectedServers.forEach((serverName) => {
-        initializeServer(serverName);
-      });
-    },
-    [connectionStatus, setMCPValues, initializeServer, isInitializing],
-  );
-
   const toggleServerSelection = useCallback(
     (serverName: string) => {
       if (isInitializing(serverName)) {
@@ -469,15 +446,10 @@ export function useMCPServerManager({ conversationId }: { conversationId?: strin
         const filteredValues = currentValues.filter((name) => name !== serverName);
         setMCPValues(filteredValues);
       } else {
-        const serverStatus = connectionStatus?.[serverName];
-        if (serverStatus?.connectionState === 'connected') {
-          setMCPValues([...currentValues, serverName]);
-        } else {
-          initializeServer(serverName);
-        }
+        setMCPValues([...currentValues, serverName]);
       }
     },
-    [mcpValues, setMCPValues, connectionStatus, initializeServer, isInitializing],
+    [mcpValues, setMCPValues, isInitializing],
   );
 
   const handleConfigSave = useCallback(
@@ -673,7 +645,6 @@ export function useMCPServerManager({ conversationId }: { conversationId?: strin
     isPinned,
     setIsPinned,
     placeholderText,
-    batchToggleServers,
     toggleServerSelection,
     localize,
 
diff --git a/client/src/hooks/Plugins/__tests__/useToolToggle.test.tsx b/client/src/hooks/Plugins/__tests__/useToolToggle.test.tsx
new file mode 100644
index 0000000000..f617db2249
--- /dev/null
+++ b/client/src/hooks/Plugins/__tests__/useToolToggle.test.tsx
@@ -0,0 +1,328 @@
+import React from 'react';
+import { renderHook, act, waitFor } from '@testing-library/react';
+import { LocalStorageKeys, Tools } from 'librechat-data-provider';
+import { RecoilRoot, useRecoilValue, useSetRecoilState } from 'recoil';
+import { ephemeralAgentByConvoId } from '~/store';
+import { useToolToggle } from '../useToolToggle';
+
+/**
+ * Tests for useToolToggle — the hook responsible for toggling tool badges
+ * (code execution, web search, file search, artifacts) and persisting state.
+ *
+ * Desired behaviors:
+ * - User toggles persist to per-conversation localStorage
+ * - In non-spec mode with specs configured (storageContextKey = '__defaults__'),
+ *   toggles ALSO persist to the defaults key so future new conversations inherit them
+ * - In spec mode (storageContextKey = undefined), toggles only persist per-conversation
+ * - The hook reflects the current ephemeral agent state
+ */
+
+// Mock data-provider auth query
+jest.mock('~/data-provider', () => ({
+  useVerifyAgentToolAuth: jest.fn().mockReturnValue({
+    data: { authenticated: true },
+  }),
+}));
+
+// Mock timestamps (track calls without actual localStorage timestamp logic)
+jest.mock('~/utils/timestamps', () => ({
+  setTimestamp: jest.fn(),
+}));
+
+// Mock useLocalStorageAlt (isPinned state — not relevant to our behavior tests)
+jest.mock('~/hooks/useLocalStorageAlt', () => jest.fn(() => [false, jest.fn()]));
+
+const Wrapper: React.FC<{ children: React.ReactNode }> = ({ children }) => (
+  <RecoilRoot>{children}</RecoilRoot>
+);
+
+describe('useToolToggle', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    localStorage.clear();
+  });
+
+  // ─── Dual-Write Behavior ───────────────────────────────────────────
+
+  describe('non-spec mode: dual-write to defaults key', () => {
+    const storageContextKey = '__defaults__';
+
+    it('should write to both conversation key and defaults key when user toggles a tool', () => {
+      const conversationId = 'convo-123';
+      const { result } = renderHook(
+        () =>
+          useToolToggle({
+            conversationId,
+            storageContextKey,
+            toolKey: Tools.execute_code,
+            localStorageKey: LocalStorageKeys.LAST_CODE_TOGGLE_,
+            isAuthenticated: true,
+          }),
+        { wrapper: Wrapper },
+      );
+
+      act(() => {
+        result.current.handleChange({ value: true });
+      });
+
+      // Conversation key: per-conversation persistence
+      const convoKey = `${LocalStorageKeys.LAST_CODE_TOGGLE_}${conversationId}`;
+      // Defaults key: persists for future new conversations
+      const defaultsKey = `${LocalStorageKeys.LAST_CODE_TOGGLE_}${storageContextKey}`;
+
+      // Sync effect writes to conversation key
+      expect(localStorage.getItem(convoKey)).toBe(JSON.stringify(true));
+      // handleChange dual-writes to defaults key
+      expect(localStorage.getItem(defaultsKey)).toBe(JSON.stringify(true));
+    });
+
+    it('should persist false values to defaults key when user disables a tool', () => {
+      const { result } = renderHook(
+        () =>
+          useToolToggle({
+            conversationId: 'convo-456',
+            storageContextKey,
+            toolKey: Tools.web_search,
+            localStorageKey: LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_,
+            isAuthenticated: true,
+          }),
+        { wrapper: Wrapper },
+      );
+
+      // Enable then disable
+      act(() => {
+        result.current.handleChange({ value: true });
+      });
+      act(() => {
+        result.current.handleChange({ value: false });
+      });
+
+      const defaultsKey = `${LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_}${storageContextKey}`;
+      expect(localStorage.getItem(defaultsKey)).toBe(JSON.stringify(false));
+    });
+  });
+
+  describe('spec mode: no dual-write', () => {
+    it('should only write to conversation key, not to any defaults key', () => {
+      const conversationId = 'spec-convo-789';
+      const { result } = renderHook(
+        () =>
+          useToolToggle({
+            conversationId,
+            storageContextKey: undefined, // spec mode
+            toolKey: Tools.execute_code,
+            localStorageKey: LocalStorageKeys.LAST_CODE_TOGGLE_,
+            isAuthenticated: true,
+          }),
+        { wrapper: Wrapper },
+      );
+
+      act(() => {
+        result.current.handleChange({ value: true });
+      });
+
+      // Conversation key should have the value
+      const convoKey = `${LocalStorageKeys.LAST_CODE_TOGGLE_}${conversationId}`;
+      expect(localStorage.getItem(convoKey)).toBe(JSON.stringify(true));
+
+      // Defaults key should NOT have a value
+      const defaultsKey = `${LocalStorageKeys.LAST_CODE_TOGGLE_}__defaults__`;
+      expect(localStorage.getItem(defaultsKey)).toBeNull();
+    });
+  });
+
+  // ─── Per-Conversation Isolation ────────────────────────────────────
+
+  describe('per-conversation isolation', () => {
+    it('should maintain separate toggle state per conversation', () => {
+      const TestComponent = ({ conversationId }: { conversationId: string }) => {
+        const toggle = useToolToggle({
+          conversationId,
+          toolKey: Tools.execute_code,
+          localStorageKey: LocalStorageKeys.LAST_CODE_TOGGLE_,
+          isAuthenticated: true,
+        });
+        const ephemeralAgent = useRecoilValue(ephemeralAgentByConvoId(conversationId));
+        return { toggle, ephemeralAgent };
+      };
+
+      // Conversation A: enable code
+      const { result: resultA } = renderHook(() => TestComponent({ conversationId: 'convo-A' }), {
+        wrapper: Wrapper,
+      });
+
+      act(() => {
+        resultA.current.toggle.handleChange({ value: true });
+      });
+
+      // Conversation B: disable code
+      const { result: resultB } = renderHook(() => TestComponent({ conversationId: 'convo-B' }), {
+        wrapper: Wrapper,
+      });
+
+      act(() => {
+        resultB.current.toggle.handleChange({ value: false });
+      });
+
+      // Each conversation has its own value in localStorage
+      expect(localStorage.getItem(`${LocalStorageKeys.LAST_CODE_TOGGLE_}convo-A`)).toBe('true');
+      expect(localStorage.getItem(`${LocalStorageKeys.LAST_CODE_TOGGLE_}convo-B`)).toBe('false');
+    });
+  });
+
+  // ─── Ephemeral Agent Sync ──────────────────────────────────────────
+
+  describe('ephemeral agent reflects toggle state', () => {
+    it('should update ephemeral agent when user toggles a tool', async () => {
+      const conversationId = 'convo-sync-test';
+      const TestComponent = () => {
+        const toggle = useToolToggle({
+          conversationId,
+          toolKey: Tools.execute_code,
+          localStorageKey: LocalStorageKeys.LAST_CODE_TOGGLE_,
+          isAuthenticated: true,
+        });
+        const ephemeralAgent = useRecoilValue(ephemeralAgentByConvoId(conversationId));
+        return { toggle, ephemeralAgent };
+      };
+
+      const { result } = renderHook(() => TestComponent(), { wrapper: Wrapper });
+
+      act(() => {
+        result.current.toggle.handleChange({ value: true });
+      });
+
+      await waitFor(() => {
+        expect(result.current.ephemeralAgent?.execute_code).toBe(true);
+      });
+
+      act(() => {
+        result.current.toggle.handleChange({ value: false });
+      });
+
+      await waitFor(() => {
+        expect(result.current.ephemeralAgent?.execute_code).toBe(false);
+      });
+    });
+
+    it('should reflect external ephemeral agent changes in toolValue', async () => {
+      const conversationId = 'convo-external';
+      const TestComponent = () => {
+        const toggle = useToolToggle({
+          conversationId,
+          toolKey: Tools.web_search,
+          localStorageKey: LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_,
+          isAuthenticated: true,
+        });
+        const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(conversationId));
+        return { toggle, setEphemeralAgent };
+      };
+
+      const { result } = renderHook(() => TestComponent(), { wrapper: Wrapper });
+
+      // External update (e.g., from applyModelSpecEphemeralAgent)
+      act(() => {
+        result.current.setEphemeralAgent({ web_search: true, execute_code: false });
+      });
+
+      await waitFor(() => {
+        expect(result.current.toggle.toolValue).toBe(true);
+        expect(result.current.toggle.isToolEnabled).toBe(true);
+      });
+    });
+
+    it('should sync externally-set ephemeral agent values to localStorage', async () => {
+      const conversationId = 'convo-sync-ls';
+      const TestComponent = () => {
+        const toggle = useToolToggle({
+          conversationId,
+          toolKey: Tools.file_search,
+          localStorageKey: LocalStorageKeys.LAST_FILE_SEARCH_TOGGLE_,
+          isAuthenticated: true,
+        });
+        const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(conversationId));
+        return { toggle, setEphemeralAgent };
+      };
+
+      const { result } = renderHook(() => TestComponent(), { wrapper: Wrapper });
+
+      // Simulate applyModelSpecEphemeralAgent setting a value
+      act(() => {
+        result.current.setEphemeralAgent({ file_search: true });
+      });
+
+      // The sync effect should write to conversation-keyed localStorage
+      await waitFor(() => {
+        const storageKey = `${LocalStorageKeys.LAST_FILE_SEARCH_TOGGLE_}${conversationId}`;
+        expect(localStorage.getItem(storageKey)).toBe(JSON.stringify(true));
+      });
+    });
+  });
+
+  // ─── isToolEnabled computation ─────────────────────────────────────
+
+  describe('isToolEnabled computation', () => {
+    it('should return false when tool is not set', () => {
+      const { result } = renderHook(
+        () =>
+          useToolToggle({
+            conversationId: 'convo-1',
+            toolKey: Tools.execute_code,
+            localStorageKey: LocalStorageKeys.LAST_CODE_TOGGLE_,
+            isAuthenticated: true,
+          }),
+        { wrapper: Wrapper },
+      );
+
+      expect(result.current.isToolEnabled).toBe(false);
+    });
+
+    it('should treat non-empty string as enabled (artifacts)', async () => {
+      const conversationId = 'convo-artifacts';
+      const TestComponent = () => {
+        const toggle = useToolToggle({
+          conversationId,
+          toolKey: 'artifacts',
+          localStorageKey: LocalStorageKeys.LAST_ARTIFACTS_TOGGLE_,
+          isAuthenticated: true,
+        });
+        const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(conversationId));
+        return { toggle, setEphemeralAgent };
+      };
+
+      const { result } = renderHook(() => TestComponent(), { wrapper: Wrapper });
+
+      act(() => {
+        result.current.setEphemeralAgent({ artifacts: 'default' });
+      });
+
+      await waitFor(() => {
+        expect(result.current.toggle.isToolEnabled).toBe(true);
+      });
+    });
+
+    it('should treat empty string as disabled (artifacts off)', async () => {
+      const conversationId = 'convo-no-artifacts';
+      const TestComponent = () => {
+        const toggle = useToolToggle({
+          conversationId,
+          toolKey: 'artifacts',
+          localStorageKey: LocalStorageKeys.LAST_ARTIFACTS_TOGGLE_,
+          isAuthenticated: true,
+        });
+        const setEphemeralAgent = useSetRecoilState(ephemeralAgentByConvoId(conversationId));
+        return { toggle, setEphemeralAgent };
+      };
+
+      const { result } = renderHook(() => TestComponent(), { wrapper: Wrapper });
+
+      act(() => {
+        result.current.setEphemeralAgent({ artifacts: '' });
+      });
+
+      await waitFor(() => {
+        expect(result.current.toggle.isToolEnabled).toBe(false);
+      });
+    });
+  });
+});
diff --git a/client/src/hooks/Plugins/useToolToggle.ts b/client/src/hooks/Plugins/useToolToggle.ts
index 3b12e87d51..d8026cad1c 100644
--- a/client/src/hooks/Plugins/useToolToggle.ts
+++ b/client/src/hooks/Plugins/useToolToggle.ts
@@ -13,6 +13,7 @@ type ToolValue = boolean | string;
 
 interface UseToolToggleOptions {
   conversationId?: string | null;
+  storageContextKey?: string;
   toolKey: string;
   localStorageKey: LocalStorageKeys;
   isAuthenticated?: boolean;
@@ -26,6 +27,7 @@ interface UseToolToggleOptions {
 
 export function useToolToggle({
   conversationId,
+  storageContextKey,
   toolKey: _toolKey,
   localStorageKey,
   isAuthenticated: externalIsAuthenticated,
@@ -93,8 +95,22 @@ export function useToolToggle({
         ...(prev || {}),
         [toolKey]: value,
       }));
+
+      // Dual-write to environment key for new conversation defaults
+      if (storageContextKey) {
+        const envKey = `${localStorageKey}${storageContextKey}`;
+        localStorage.setItem(envKey, JSON.stringify(value));
+        setTimestamp(envKey);
+      }
     },
-    [setIsDialogOpen, isAuthenticated, setEphemeralAgent, toolKey],
+    [
+      setIsDialogOpen,
+      isAuthenticated,
+      setEphemeralAgent,
+      toolKey,
+      storageContextKey,
+      localStorageKey,
+    ],
   );
 
   const debouncedChange = useMemo(
diff --git a/client/src/hooks/SSE/__tests__/useStepHandler.spec.ts b/client/src/hooks/SSE/__tests__/useStepHandler.spec.ts
new file mode 100644
index 0000000000..cbe13f3910
--- /dev/null
+++ b/client/src/hooks/SSE/__tests__/useStepHandler.spec.ts
@@ -0,0 +1,1085 @@
+import { renderHook, act } from '@testing-library/react';
+import { StepTypes, ContentTypes, ToolCallTypes } from 'librechat-data-provider';
+import type {
+  TMessageContentParts,
+  EventSubmission,
+  TEndpointOption,
+  TConversation,
+  TMessage,
+  Agents,
+} from 'librechat-data-provider';
+import useStepHandler from '~/hooks/SSE/useStepHandler';
+
+type TSubmissionForTest = {
+  userMessage: TMessage;
+  isEdited?: boolean;
+  isContinued?: boolean;
+  isTemporary: boolean;
+  messages: TMessage[];
+  isRegenerate?: boolean;
+  conversation: Partial<TConversation>;
+  endpointOption: TEndpointOption;
+  initialResponse: TMessage;
+  editedContent?: { index: number; type: string; [key: string]: unknown } | null;
+};
+
+describe('useStepHandler', () => {
+  const mockSetMessages = jest.fn();
+  const mockGetMessages = jest.fn();
+  const mockAnnouncePolite = jest.fn();
+  const mockLastAnnouncementTimeRef = { current: 0 };
+
+  const createHookParams = () => ({
+    setMessages: mockSetMessages,
+    getMessages: mockGetMessages,
+    announcePolite: mockAnnouncePolite,
+    lastAnnouncementTimeRef: mockLastAnnouncementTimeRef,
+  });
+
+  const createUserMessage = (overrides: Partial<TMessage> = {}): TMessage => ({
+    messageId: 'user-msg-1',
+    conversationId: 'conv-1',
+    parentMessageId: '00000000-0000-0000-0000-000000000000',
+    isCreatedByUser: true,
+    text: 'Hello',
+    sender: 'User',
+    ...overrides,
+  });
+
+  const createResponseMessage = (overrides: Partial<TMessage> = {}): TMessage => ({
+    messageId: 'response-msg-1',
+    conversationId: 'conv-1',
+    parentMessageId: 'user-msg-1',
+    isCreatedByUser: false,
+    text: '',
+    sender: 'Assistant',
+    content: [],
+    ...overrides,
+  });
+
+  const createSubmission = (overrides: Partial<TSubmissionForTest> = {}): EventSubmission =>
+    ({
+      userMessage: createUserMessage(),
+      isRegenerate: false,
+      isEdited: false,
+      isContinued: false,
+      isTemporary: false,
+      messages: [],
+      conversation: {},
+      endpointOption: {} as TEndpointOption,
+      initialResponse: createResponseMessage(),
+      ...overrides,
+    }) as unknown as EventSubmission;
+
+  const createRunStep = (overrides: Partial<Agents.RunStep> = {}): Agents.RunStep => ({
+    id: 'step-1',
+    runId: 'response-msg-1',
+    index: 0,
+    type: StepTypes.MESSAGE_CREATION,
+    stepDetails: {
+      type: StepTypes.MESSAGE_CREATION,
+      message_creation: { message_id: 'msg-1' },
+    },
+    usage: null,
+    ...overrides,
+  });
+
+  const createToolCallRunStep = (overrides: Partial<Agents.RunStep> = {}): Agents.RunStep => ({
+    id: 'step-tool-1',
+    runId: 'response-msg-1',
+    index: 0,
+    type: StepTypes.TOOL_CALLS,
+    stepDetails: {
+      type: StepTypes.TOOL_CALLS,
+      tool_calls: [
+        {
+          id: 'tool-call-1',
+          name: 'test_tool',
+          args: '{}',
+          type: ToolCallTypes.TOOL_CALL,
+        },
+      ],
+    },
+    usage: null,
+    ...overrides,
+  });
+
+  const createMessageDelta = (
+    stepId: string,
+    text: string,
+    overrides: Partial<Agents.MessageDeltaEvent> = {},
+  ): Agents.MessageDeltaEvent => ({
+    id: stepId,
+    delta: {
+      content: [{ type: ContentTypes.TEXT, text }],
+    },
+    ...overrides,
+  });
+
+  const createReasoningDelta = (
+    stepId: string,
+    think: string,
+    overrides: Partial<Agents.ReasoningDeltaEvent> = {},
+  ): Agents.ReasoningDeltaEvent => ({
+    id: stepId,
+    delta: {
+      content: [{ type: ContentTypes.THINK, think }],
+    },
+    ...overrides,
+  });
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    mockLastAnnouncementTimeRef.current = 0;
+    mockGetMessages.mockReturnValue([]);
+  });
+
+  describe('initialization', () => {
+    it('should return stepHandler, clearStepMaps, and syncStepMessage functions', () => {
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      expect(typeof result.current.stepHandler).toBe('function');
+      expect(typeof result.current.clearStepMaps).toBe('function');
+      expect(typeof result.current.syncStepMessage).toBe('function');
+    });
+  });
+
+  describe('on_run_step event', () => {
+    it('should create response message when not in messageMap', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const setMessagesCall = mockSetMessages.mock.calls[0][0];
+      expect(setMessagesCall).toContainEqual(
+        expect.objectContaining({ messageId: 'response-msg-1' }),
+      );
+    });
+
+    it('should warn and return early when no responseMessageId', () => {
+      const consoleSpy = jest.spyOn(console, 'warn').mockImplementation();
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep({ runId: '' });
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(consoleSpy).toHaveBeenCalledWith('No message id found in run step event');
+      expect(mockSetMessages).not.toHaveBeenCalled();
+      consoleSpy.mockRestore();
+    });
+
+    it('should handle USE_PRELIM_RESPONSE_MESSAGE_ID by using initialResponse', () => {
+      const initialResponse = createResponseMessage({ messageId: 'initial-response-id' });
+      mockGetMessages.mockReturnValue([initialResponse]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep({ runId: 'USE_PRELIM_RESPONSE_MESSAGE_ID' });
+      const submission = createSubmission({
+        initialResponse,
+      });
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+
+    it('should handle tool call steps and store tool call IDs', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createToolCallRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall.find((m: TMessage) => !m.isCreatedByUser);
+      expect(responseMsg?.content).toContainEqual(
+        expect.objectContaining({
+          type: ContentTypes.TOOL_CALL,
+          tool_call: expect.objectContaining({ name: 'test_tool' }),
+        }),
+      );
+    });
+
+    it('should replay buffered deltas after registering step', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const submission = createSubmission();
+      const stepId = 'step-buffered';
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta(stepId, 'Hello') },
+          submission,
+        );
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+
+      const runStep = createRunStep({ id: stepId });
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall.find((m: TMessage) => !m.isCreatedByUser);
+      expect(responseMsg?.content).toContainEqual(
+        expect.objectContaining({ type: ContentTypes.TEXT, text: 'Hello' }),
+      );
+    });
+
+    it('should ensure userMessage is present in multi-tab scenarios', () => {
+      const userMsg = createUserMessage();
+      mockGetMessages.mockReturnValue([]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission({ userMessage: userMsg });
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const setMessagesCall = mockSetMessages.mock.calls[0][0];
+      expect(setMessagesCall).toContainEqual(
+        expect.objectContaining({ messageId: userMsg.messageId }),
+      );
+    });
+
+    it('should propagate step metadata (agentId, groupId) for parallel rendering', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createToolCallRunStep({
+        agentId: 'agent-1',
+        groupId: 2,
+      });
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall.find((m: TMessage) => !m.isCreatedByUser);
+      const toolCallContent = responseMsg?.content?.find(
+        (c: TMessageContentParts) => c.type === ContentTypes.TOOL_CALL,
+      );
+      expect(toolCallContent).toMatchObject({
+        agentId: 'agent-1',
+        groupId: 2,
+      });
+    });
+  });
+
+  describe('on_agent_update event', () => {
+    it('should update message with agent update content', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const agentUpdate: Agents.AgentUpdate = {
+        type: ContentTypes.AGENT_UPDATE,
+        agent_update: {
+          runId: 'response-msg-1',
+          index: 1,
+          agentId: 'agent-1',
+        },
+      };
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_agent_update', data: agentUpdate }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+
+    it('should warn when no responseMessageId for agent update', () => {
+      const consoleSpy = jest.spyOn(console, 'warn').mockImplementation();
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const agentUpdate: Agents.AgentUpdate = {
+        type: ContentTypes.AGENT_UPDATE,
+        agent_update: {
+          runId: '',
+          index: 0,
+          agentId: 'agent-1',
+        },
+      };
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_agent_update', data: agentUpdate }, submission);
+      });
+
+      expect(consoleSpy).toHaveBeenCalledWith('No message id found in agent update event');
+      consoleSpy.mockRestore();
+    });
+  });
+
+  describe('on_message_delta event', () => {
+    it('should append text delta to existing content', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const messageDelta = createMessageDelta('step-1', 'Hello');
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_message_delta', data: messageDelta }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall[lastCall.length - 1];
+      expect(responseMsg.content).toContainEqual(
+        expect.objectContaining({ type: ContentTypes.TEXT, text: 'Hello' }),
+      );
+    });
+
+    it('should buffer delta when step does not exist', () => {
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const messageDelta = createMessageDelta('nonexistent-step', 'Buffered');
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_message_delta', data: messageDelta }, submission);
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+    });
+
+    it('should concatenate multiple text deltas', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta('step-1', 'Hello ') },
+          submission,
+        );
+      });
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta('step-1', 'World') },
+          submission,
+        );
+      });
+
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall[lastCall.length - 1];
+      expect(responseMsg.content).toContainEqual(
+        expect.objectContaining({ type: ContentTypes.TEXT, text: 'Hello World' }),
+      );
+    });
+
+    it('should return early when contentPart is null', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const messageDelta: Agents.MessageDeltaEvent = {
+        id: 'step-1',
+        delta: { content: [] },
+      };
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_message_delta', data: messageDelta }, submission);
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('on_reasoning_delta event', () => {
+    it('should append reasoning delta to existing content', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const reasoningDelta = createReasoningDelta('step-1', 'Thinking...');
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_reasoning_delta', data: reasoningDelta },
+          submission,
+        );
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall[lastCall.length - 1];
+      expect(responseMsg.content).toContainEqual(
+        expect.objectContaining({ type: ContentTypes.THINK, think: 'Thinking...' }),
+      );
+    });
+
+    it('should buffer reasoning delta when step does not exist', () => {
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const reasoningDelta = createReasoningDelta('nonexistent-step', 'Buffered');
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_reasoning_delta', data: reasoningDelta },
+          submission,
+        );
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+    });
+
+    it('should concatenate multiple reasoning deltas', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_reasoning_delta', data: createReasoningDelta('step-1', 'First ') },
+          submission,
+        );
+      });
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_reasoning_delta', data: createReasoningDelta('step-1', 'thought') },
+          submission,
+        );
+      });
+
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall[lastCall.length - 1];
+      expect(responseMsg.content).toContainEqual(
+        expect.objectContaining({ type: ContentTypes.THINK, think: 'First thought' }),
+      );
+    });
+  });
+
+  describe('on_run_step_delta event', () => {
+    it('should update tool call with delta args', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createToolCallRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const runStepDelta: Agents.RunStepDeltaEvent = {
+        id: 'step-tool-1',
+        delta: {
+          type: StepTypes.TOOL_CALLS,
+          tool_calls: [{ name: 'test_tool', args: '{"key": "value"}' }],
+        },
+      };
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step_delta', data: runStepDelta }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+
+    it('should buffer run step delta when step does not exist', () => {
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStepDelta: Agents.RunStepDeltaEvent = {
+        id: 'nonexistent-step',
+        delta: {
+          type: StepTypes.TOOL_CALLS,
+          tool_calls: [{ name: 'test_tool', args: '{}' }],
+        },
+      };
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step_delta', data: runStepDelta }, submission);
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+    });
+
+    it('should handle auth information in run step delta', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createToolCallRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const runStepDelta: Agents.RunStepDeltaEvent = {
+        id: 'step-tool-1',
+        delta: {
+          type: StepTypes.TOOL_CALLS,
+          tool_calls: [{ name: 'test_tool', args: '{}' }],
+          auth: 'oauth-token-123',
+          expires_at: 1704067200,
+        },
+      };
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step_delta', data: runStepDelta }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall.find((m: TMessage) => !m.isCreatedByUser);
+      const toolCallContent = responseMsg?.content?.find(
+        (c: TMessageContentParts) => c.type === ContentTypes.TOOL_CALL,
+      );
+      expect(toolCallContent?.tool_call?.auth).toEqual('oauth-token-123');
+    });
+  });
+
+  describe('on_run_step_completed event', () => {
+    it('should finalize tool call with output', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createToolCallRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const completedEvent = {
+        result: {
+          id: 'step-tool-1',
+          index: 0,
+          tool_call: {
+            id: 'tool-call-1',
+            name: 'test_tool',
+            args: '{}',
+            output: 'Tool result output',
+            type: ToolCallTypes.TOOL_CALL,
+          },
+        },
+      };
+
+      act(() => {
+        result.current.stepHandler(
+          {
+            event: 'on_run_step_completed',
+            data: completedEvent as unknown as Agents.ToolEndEvent,
+          },
+          submission,
+        );
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall.find((m: TMessage) => !m.isCreatedByUser);
+      const toolCallContent = responseMsg?.content?.find(
+        (c: TMessageContentParts) => c.type === ContentTypes.TOOL_CALL,
+      );
+      expect(toolCallContent?.tool_call?.output).toBe('Tool result output');
+      expect(toolCallContent?.tool_call?.progress).toBe(1);
+    });
+
+    it('should warn when step not found for completed event', () => {
+      const consoleSpy = jest.spyOn(console, 'warn').mockImplementation();
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const completedEvent = {
+        result: {
+          id: 'nonexistent-step',
+          index: 0,
+          tool_call: {
+            id: 'tool-call-1',
+            name: 'test_tool',
+            args: '{}',
+            type: ToolCallTypes.TOOL_CALL,
+          },
+        },
+      };
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler(
+          {
+            event: 'on_run_step_completed',
+            data: completedEvent as unknown as Agents.ToolEndEvent,
+          },
+          submission,
+        );
+      });
+
+      expect(consoleSpy).toHaveBeenCalledWith(
+        'No run step or runId found for completed tool call event',
+      );
+      consoleSpy.mockRestore();
+    });
+  });
+
+  describe('clearStepMaps', () => {
+    it('should clear all internal maps', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      act(() => {
+        result.current.clearStepMaps();
+      });
+
+      mockSetMessages.mockClear();
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta('step-1', 'Test') },
+          submission,
+        );
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('syncStepMessage', () => {
+    it('should sync message into messageMap', () => {
+      const responseMessage = createResponseMessage({
+        content: [{ type: ContentTypes.TEXT, text: 'Synced content' }],
+      });
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      act(() => {
+        result.current.syncStepMessage(responseMessage);
+      });
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta('step-1', ' more') },
+          submission,
+        );
+      });
+
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall[lastCall.length - 1];
+      expect(responseMsg.content).toContainEqual(
+        expect.objectContaining({ type: ContentTypes.TEXT, text: 'Synced content more' }),
+      );
+    });
+
+    it('should handle null message gracefully', () => {
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      expect(() => {
+        act(() => {
+          result.current.syncStepMessage(null as unknown as TMessage);
+        });
+      }).not.toThrow();
+    });
+
+    it('should handle message without messageId gracefully', () => {
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      expect(() => {
+        act(() => {
+          result.current.syncStepMessage({ ...createResponseMessage(), messageId: '' });
+        });
+      }).not.toThrow();
+    });
+  });
+
+  describe('announcePolite for accessibility', () => {
+    it('should announce composing after MESSAGE_UPDATE_INTERVAL', () => {
+      const MESSAGE_UPDATE_INTERVAL = 7000;
+      mockLastAnnouncementTimeRef.current = Date.now() - MESSAGE_UPDATE_INTERVAL - 1;
+
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockAnnouncePolite).toHaveBeenCalledWith({ message: 'composing', isStatus: true });
+    });
+
+    it('should not announce if within MESSAGE_UPDATE_INTERVAL', () => {
+      mockLastAnnouncementTimeRef.current = Date.now();
+
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockAnnouncePolite).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('edited content scenarios', () => {
+    it('should use initialResponse content for index offsetting in edit scenarios', () => {
+      const existingContent: TMessageContentParts[] = [
+        { type: ContentTypes.TEXT, text: 'Previous content' },
+      ];
+      const initialResponse = createResponseMessage({
+        messageId: 'initial-response-id',
+        content: existingContent,
+      });
+      mockGetMessages.mockReturnValue([initialResponse]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep({
+        runId: 'initial-response-id',
+        index: 0,
+      });
+      const submission = createSubmission({
+        editedContent: { index: 0, type: ContentTypes.TEXT, text: 'Previous content' },
+        initialResponse,
+      });
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+  });
+
+  describe('delta buffering and replay', () => {
+    it('should buffer multiple deltas and replay in order', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const submission = createSubmission();
+      const stepId = 'step-multi-buffer';
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta(stepId, 'First ') },
+          submission,
+        );
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta(stepId, 'Second ') },
+          submission,
+        );
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta(stepId, 'Third') },
+          submission,
+        );
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+
+      const runStep = createRunStep({ id: stepId });
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+      const lastCall = mockSetMessages.mock.calls[mockSetMessages.mock.calls.length - 1][0];
+      const responseMsg = lastCall.find((m: TMessage) => !m.isCreatedByUser);
+      expect(responseMsg?.content).toContainEqual(
+        expect.objectContaining({ type: ContentTypes.TEXT, text: 'First Second Third' }),
+      );
+    });
+
+    it('should buffer mixed delta types and replay correctly', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const submission = createSubmission();
+      const stepId = 'step-mixed-buffer';
+
+      act(() => {
+        result.current.stepHandler(
+          { event: 'on_reasoning_delta', data: createReasoningDelta(stepId, 'Thinking...') },
+          submission,
+        );
+        result.current.stepHandler(
+          { event: 'on_message_delta', data: createMessageDelta(stepId, 'Response') },
+          submission,
+        );
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+
+      const runStep = createRunStep({ id: stepId });
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+  });
+
+  describe('content type mismatch handling', () => {
+    it('should warn on content type mismatch and not overwrite', () => {
+      const consoleSpy = jest.spyOn(console, 'warn').mockImplementation();
+
+      const responseMessage = createResponseMessage({
+        content: [{ type: ContentTypes.THINK, think: 'Existing thought' }],
+      });
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      act(() => {
+        result.current.syncStepMessage(responseMessage);
+      });
+
+      const runStep = createRunStep({ index: 0 });
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      const textDelta: Agents.MessageDeltaEvent = {
+        id: 'step-1',
+        delta: { content: [{ type: ContentTypes.TEXT, text: 'New text' }] },
+      };
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_message_delta', data: textDelta }, submission);
+      });
+
+      expect(consoleSpy).toHaveBeenCalledWith(
+        'Content type mismatch',
+        expect.objectContaining({
+          existingType: ContentTypes.THINK,
+          contentType: ContentTypes.TEXT,
+        }),
+      );
+      consoleSpy.mockRestore();
+    });
+  });
+
+  describe('edge cases', () => {
+    it('should handle empty messages array', () => {
+      mockGetMessages.mockReturnValue([]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+
+    it('should handle undefined messages from getMessages', () => {
+      mockGetMessages.mockReturnValue(undefined);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+
+    it('should handle delta with array content', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      const messageDelta: Agents.MessageDeltaEvent = {
+        id: 'step-1',
+        delta: {
+          content: [
+            { type: ContentTypes.TEXT, text: 'First' },
+            { type: ContentTypes.TEXT, text: 'Second' },
+          ],
+        },
+      };
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_message_delta', data: messageDelta }, submission);
+      });
+
+      expect(mockSetMessages).toHaveBeenCalled();
+    });
+
+    it('should handle message delta without content', () => {
+      const responseMessage = createResponseMessage();
+      mockGetMessages.mockReturnValue([responseMessage]);
+
+      const { result } = renderHook(() => useStepHandler(createHookParams()));
+
+      const runStep = createRunStep();
+      const submission = createSubmission();
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_run_step', data: runStep }, submission);
+      });
+
+      mockSetMessages.mockClear();
+
+      const messageDelta: Agents.MessageDeltaEvent = {
+        id: 'step-1',
+        delta: {},
+      };
+
+      act(() => {
+        result.current.stepHandler({ event: 'on_message_delta', data: messageDelta }, submission);
+      });
+
+      expect(mockSetMessages).not.toHaveBeenCalled();
+    });
+  });
+});
diff --git a/client/src/hooks/SSE/useAttachmentHandler.ts b/client/src/hooks/SSE/useAttachmentHandler.ts
index 8ac9f35eb2..06261f4af6 100644
--- a/client/src/hooks/SSE/useAttachmentHandler.ts
+++ b/client/src/hooks/SSE/useAttachmentHandler.ts
@@ -1,7 +1,12 @@
 import { useSetRecoilState } from 'recoil';
 import type { QueryClient } from '@tanstack/react-query';
 import { QueryKeys, Tools } from 'librechat-data-provider';
-import type { TAttachment, EventSubmission, MemoriesResponse } from 'librechat-data-provider';
+import type {
+  MemoriesResponse,
+  EventSubmission,
+  TAttachment,
+  TFile,
+} from 'librechat-data-provider';
 import { handleMemoryArtifact } from '~/utils/memory';
 import store from '~/store';
 
@@ -11,9 +16,24 @@ export default function useAttachmentHandler(queryClient?: QueryClient) {
   return ({ data }: { data: TAttachment; submission: EventSubmission }) => {
     const { messageId } = data;
 
-    if (queryClient && data?.filepath && !data.filepath.includes('/api/files')) {
-      queryClient.setQueryData([QueryKeys.files], (oldData: TAttachment[] | undefined) => {
-        return [data, ...(oldData || [])];
+    const fileData = data as TFile;
+    if (
+      queryClient &&
+      fileData?.file_id &&
+      fileData?.filepath &&
+      !fileData.filepath.includes('/api/files')
+    ) {
+      queryClient.setQueryData([QueryKeys.files], (oldData: TFile[] | undefined) => {
+        if (!oldData) {
+          return [fileData];
+        }
+        const existingIndex = oldData.findIndex((file) => file.file_id === fileData.file_id);
+        if (existingIndex > -1) {
+          const updated = [...oldData];
+          updated[existingIndex] = { ...oldData[existingIndex], ...fileData };
+          return updated;
+        }
+        return [fileData, ...oldData];
       });
     }
 
diff --git a/client/src/hooks/SSE/useStepHandler.ts b/client/src/hooks/SSE/useStepHandler.ts
index cb4de3739c..c3b48cb107 100644
--- a/client/src/hooks/SSE/useStepHandler.ts
+++ b/client/src/hooks/SSE/useStepHandler.ts
@@ -31,6 +31,8 @@ type TStepEvent = {
   event: string;
   data:
     | Agents.MessageDeltaEvent
+    | Agents.ReasoningDeltaEvent
+    | Agents.RunStepDeltaEvent
     | Agents.AgentUpdate
     | Agents.RunStep
     | Agents.ToolEndEvent
@@ -61,6 +63,8 @@ export default function useStepHandler({
   const toolCallIdMap = useRef(new Map<string, string | undefined>());
   const messageMap = useRef(new Map<string, TMessage>());
   const stepMap = useRef(new Map<string, Agents.RunStep>());
+  /** Buffer for deltas that arrive before their corresponding run step */
+  const pendingDeltaBuffer = useRef(new Map<string, TStepEvent[]>());
 
   /**
    * Calculate content index for a run step.
@@ -107,7 +111,7 @@ export default function useStepHandler({
     const updatedContent = [...(message.content || [])] as Array<
       Partial<TMessageContentParts> | undefined
     >;
-    if (!updatedContent[index]) {
+    if (!updatedContent[index] && contentType !== ContentTypes.TOOL_CALL) {
       updatedContent[index] = { type: contentPart.type as AllContentTypes };
     }
 
@@ -350,6 +354,14 @@ export default function useStepHandler({
 
           setMessages(updatedMessages);
         }
+
+        const bufferedDeltas = pendingDeltaBuffer.current.get(runStep.id);
+        if (bufferedDeltas && bufferedDeltas.length > 0) {
+          pendingDeltaBuffer.current.delete(runStep.id);
+          for (const bufferedDelta of bufferedDeltas) {
+            stepHandler({ event: bufferedDelta.event, data: bufferedDelta.data }, submission);
+          }
+        }
       } else if (event === 'on_agent_update') {
         const { agent_update } = data as Agents.AgentUpdate;
         let responseMessageId = agent_update.runId || '';
@@ -391,7 +403,9 @@ export default function useStepHandler({
         }
 
         if (!runStep || !responseMessageId) {
-          console.warn('No run step or runId found for message delta event');
+          const buffer = pendingDeltaBuffer.current.get(messageDelta.id) ?? [];
+          buffer.push({ event: 'on_message_delta', data: messageDelta });
+          pendingDeltaBuffer.current.set(messageDelta.id, buffer);
           return;
         }
 
@@ -432,7 +446,9 @@ export default function useStepHandler({
         }
 
         if (!runStep || !responseMessageId) {
-          console.warn('No run step or runId found for reasoning delta event');
+          const buffer = pendingDeltaBuffer.current.get(reasoningDelta.id) ?? [];
+          buffer.push({ event: 'on_reasoning_delta', data: reasoningDelta });
+          pendingDeltaBuffer.current.set(reasoningDelta.id, buffer);
           return;
         }
 
@@ -473,7 +489,9 @@ export default function useStepHandler({
         }
 
         if (!runStep || !responseMessageId) {
-          console.warn('No run step or runId found for run step delta event');
+          const buffer = pendingDeltaBuffer.current.get(runStepDelta.id) ?? [];
+          buffer.push({ event: 'on_run_step_delta', data: runStepDelta });
+          pendingDeltaBuffer.current.set(runStepDelta.id, buffer);
           return;
         }
 
@@ -578,6 +596,7 @@ export default function useStepHandler({
     toolCallIdMap.current.clear();
     messageMap.current.clear();
     stepMap.current.clear();
+    pendingDeltaBuffer.current.clear();
   }, []);
 
   /**
diff --git a/client/src/hooks/Sharing/useCanSharePublic.ts b/client/src/hooks/Sharing/useCanSharePublic.ts
index 699ccc9e73..54355dd9a8 100644
--- a/client/src/hooks/Sharing/useCanSharePublic.ts
+++ b/client/src/hooks/Sharing/useCanSharePublic.ts
@@ -1,10 +1,11 @@
 import { ResourceType, PermissionTypes, Permissions } from 'librechat-data-provider';
 import { useHasAccess } from '~/hooks';
 
-const resourceToPermissionMap: Record<ResourceType, PermissionTypes> = {
+const resourceToPermissionMap: Partial<Record<ResourceType, PermissionTypes>> = {
   [ResourceType.AGENT]: PermissionTypes.AGENTS,
   [ResourceType.PROMPTGROUP]: PermissionTypes.PROMPTS,
   [ResourceType.MCPSERVER]: PermissionTypes.MCP_SERVERS,
+  [ResourceType.REMOTE_AGENT]: PermissionTypes.REMOTE_AGENTS,
 };
 
 /**
diff --git a/client/src/hooks/useNewConvo.ts b/client/src/hooks/useNewConvo.ts
index fd2e20e0ee..7fa499f40d 100644
--- a/client/src/hooks/useNewConvo.ts
+++ b/client/src/hooks/useNewConvo.ts
@@ -14,6 +14,7 @@ import {
   LocalStorageKeys,
   isEphemeralAgentId,
   isAssistantsEndpoint,
+  getDefaultParamsEndpoint,
 } from 'librechat-data-provider';
 import type {
   TPreset,
@@ -191,11 +192,13 @@ const useNewConvo = (index = 0) => {
           }
 
           const models = modelsConfig?.[defaultEndpoint] ?? [];
+          const defaultParamsEndpoint = getDefaultParamsEndpoint(endpointsConfig, defaultEndpoint);
           conversation = buildDefaultConvo({
             conversation,
             lastConversationSetup: activePreset as TConversation,
             endpoint: defaultEndpoint,
             models,
+            defaultParamsEndpoint,
           });
         }
 
@@ -249,7 +252,7 @@ const useNewConvo = (index = 0) => {
           state: disableFocus ? {} : { focusChat: true },
         });
       },
-    [endpointsConfig, defaultPreset, assistantsListMap, modelsQuery.data],
+    [endpointsConfig, defaultPreset, assistantsListMap, modelsQuery.data, hasAgentAccess],
   );
 
   const newConversation = useCallback(
diff --git a/client/src/locales/de/translation.json b/client/src/locales/de/translation.json
index 4862869274..aca7f8ff2a 100644
--- a/client/src/locales/de/translation.json
+++ b/client/src/locales/de/translation.json
@@ -1140,7 +1140,6 @@
   "com_ui_open_source_chat_new_tab_title": "Quell-Chat in neuem Tab öffnen - {{title}}",
   "com_ui_open_var": "{{0}} öffnen",
   "com_ui_openai": "OpenAI",
-  "com_ui_opens_new_tab": "(öffnet in neuem Tab)",
   "com_ui_optional": "(Optional)",
   "com_ui_page": "Seite",
   "com_ui_people": "Personen",
diff --git a/client/src/locales/en/translation.json b/client/src/locales/en/translation.json
index cd3f3151c7..a9f8805d9b 100644
--- a/client/src/locales/en/translation.json
+++ b/client/src/locales/en/translation.json
@@ -3,6 +3,7 @@
   "chat_direction_right_to_left": "Right to Left",
   "com_a11y_ai_composing": "The AI is still composing.",
   "com_a11y_end": "The AI has finished their reply.",
+  "com_a11y_selected": "selected",
   "com_a11y_start": "The AI has started their reply.",
   "com_agents_agent_card_label": "{{name}} agent. {{description}}",
   "com_agents_all": "All Agents",
@@ -223,10 +224,11 @@
   "com_endpoint_agent": "Agent",
   "com_endpoint_agent_placeholder": "Please select an Agent",
   "com_endpoint_ai": "AI",
+  "com_endpoint_anthropic_effort": "Controls how much computational effort Claude applies. Lower effort saves tokens and reduces latency; higher effort produces more thorough responses. 'Max' enables the deepest reasoning (Opus 4.6 only).",
   "com_endpoint_anthropic_maxoutputtokens": "Maximum number of tokens that can be generated in the response. Specify a lower value for shorter responses and a higher value for longer responses. Note: models may stop before reaching this maximum.",
   "com_endpoint_anthropic_prompt_cache": "Prompt caching allows reusing large context or instructions across API calls, reducing costs and latency",
   "com_endpoint_anthropic_temp": "Ranges from 0 to 1. Use temp closer to 0 for analytical / multiple choice, and closer to 1 for creative and generative tasks. We recommend altering this or Top P but not both.",
-  "com_endpoint_anthropic_thinking": "Enables internal reasoning for supported Claude models (3.7 Sonnet). Note: requires \"Thinking Budget\" to be set and lower than \"Max Output Tokens\"",
+  "com_endpoint_anthropic_thinking": "Enables internal reasoning for supported Claude models. For newer models (Opus 4.6+), uses adaptive thinking controlled by the Effort parameter. For legacy models, requires \"Thinking Budget\" to be set and lower than \"Max Output Tokens\".",
   "com_endpoint_anthropic_thinking_budget": "Determines the max number of tokens Claude is allowed use for its internal reasoning process. Larger budgets can improve response quality by enabling more thorough analysis for complex problems, although Claude may not use the entire budget allocated, especially at ranges above 32K. This setting must be lower than \"Max Output Tokens.\"",
   "com_endpoint_anthropic_topk": "Top-k changes how the model selects tokens for output. A top-k of 1 means the selected token is the most probable among all tokens in the model's vocabulary (also called greedy decoding), while a top-k of 3 means that the next token is selected from among the 3 most probable tokens (using temperature).",
   "com_endpoint_anthropic_topp": "Top-p changes how the model selects tokens for output. Tokens are selected from most K (see topK parameter) probable to least until the sum of their probabilities equals the top-p value.",
@@ -264,6 +266,7 @@
   "com_endpoint_default_with_num": "default: {{0}}",
   "com_endpoint_disable_streaming": "Disable streaming responses and receive the complete response at once. Useful for models like o3 that require organization verification for streaming",
   "com_endpoint_disable_streaming_label": "Disable Streaming",
+  "com_endpoint_effort": "Effort",
   "com_endpoint_examples": " Presets",
   "com_endpoint_export": "Export",
   "com_endpoint_export_share": "Export/Share",
@@ -508,16 +511,20 @@
   "com_nav_lang_german": "Deutsch",
   "com_nav_lang_hebrew": "עברית",
   "com_nav_lang_hungarian": "Magyar",
+  "com_nav_lang_icelandic": "Íslenska",
   "com_nav_lang_indonesia": "Indonesia",
   "com_nav_lang_italian": "Italiano",
   "com_nav_lang_japanese": "日本語",
   "com_nav_lang_korean": "한국어",
   "com_nav_lang_latvian": "Latviski",
+  "com_nav_lang_lithuanian": "Lietuvių",
   "com_nav_lang_norwegian_bokmal": "Norsk Bokmål",
+  "com_nav_lang_norwegian_nynorsk": "Norsk Nynorsk",
   "com_nav_lang_persian": "فارسی",
   "com_nav_lang_polish": "Polski",
   "com_nav_lang_portuguese": "Português",
   "com_nav_lang_russian": "Русский",
+  "com_nav_lang_slovak": "Slovenčina",
   "com_nav_lang_slovenian": "Slovenščina",
   "com_nav_lang_spanish": "Español",
   "com_nav_lang_swedish": "Svenska",
@@ -653,6 +660,8 @@
   "com_ui_advanced": "Advanced",
   "com_ui_advanced_settings": "Advanced Settings",
   "com_ui_agent": "Agent",
+  "com_ui_agent_api_keys": "Agent API Keys",
+  "com_ui_agent_api_keys_description": "Create API keys to access agents remotely via the API",
   "com_ui_agent_category_aftersales": "After Sales",
   "com_ui_agent_category_finance": "Finance",
   "com_ui_agent_category_general": "General",
@@ -707,6 +716,16 @@
   "com_ui_analyzing": "Analyzing",
   "com_ui_analyzing_finished": "Finished analyzing",
   "com_ui_api_key": "API Key",
+  "com_ui_api_key_copied": "API key copied to clipboard",
+  "com_ui_api_key_create_error": "Failed to create API key",
+  "com_ui_api_key_created": "API key created successfully",
+  "com_ui_api_key_delete_error": "Failed to delete API key",
+  "com_ui_api_key_deleted": "API key deleted successfully",
+  "com_ui_api_key_name": "Key Name",
+  "com_ui_api_key_name_placeholder": "My API Key",
+  "com_ui_api_key_name_required": "API key name is required",
+  "com_ui_api_key_warning": "Make sure to copy your API key now. You won't be able to see it again!",
+  "com_ui_api_keys_load_error": "Failed to load API keys",
   "com_ui_archive": "Archive",
   "com_ui_archive_delete_error": "Failed to delete archived conversation",
   "com_ui_archive_error": "Failed to archive conversation",
@@ -757,6 +776,7 @@
   "com_ui_bookmarks": "Bookmarks",
   "com_ui_bookmarks_add": "Add Bookmarks",
   "com_ui_bookmarks_add_to_conversation": "Add to current conversation",
+  "com_ui_bookmarks_count_selected": "Bookmarks, {{count}} selected",
   "com_ui_bookmarks_create_error": "There was an error creating the bookmark",
   "com_ui_bookmarks_create_exists": "This bookmark already exists",
   "com_ui_bookmarks_create_success": "Bookmark created successfully",
@@ -836,12 +856,16 @@
   "com_ui_copy_to_clipboard": "Copy to clipboard",
   "com_ui_copy_url_to_clipboard": "Copy URL to clipboard",
   "com_ui_create": "Create",
+  "com_ui_create_api_key": "Create API Key",
   "com_ui_create_assistant": "Create Assistant",
   "com_ui_create_link": "Create link",
+  "com_ui_create_mcp_server": "Create MCP server",
   "com_ui_create_memory": "Create Memory",
   "com_ui_create_new_agent": "Create New Agent",
   "com_ui_create_prompt": "Create Prompt",
   "com_ui_create_prompt_page": "New Prompt Configuration Page",
+  "com_ui_created": "Created",
+  "com_ui_creating": "Creating...",
   "com_ui_creating_image": "Creating image. May take a moment",
   "com_ui_current": "Current",
   "com_ui_currently_production": "Currently in production",
@@ -881,6 +905,9 @@
   "com_ui_delete_confirm_prompt_version_var": "This will delete the selected version for \"{{0}}.\" If no other versions exist, the prompt will be deleted.",
   "com_ui_delete_confirm_strong": "This will delete <strong>{{title}}</strong>",
   "com_ui_delete_conversation": "Delete chat?",
+  "com_ui_delete_conversation_tooltip": "Delete conversation",
+  "com_ui_delete_mcp_server": "Delete MCP Server?",
+  "com_ui_delete_mcp_server_name": "Delete MCP server {{0}}",
   "com_ui_delete_memory": "Delete Memory",
   "com_ui_delete_not_allowed": "Delete operation is not allowed",
   "com_ui_delete_preset": "Delete Preset?",
@@ -893,6 +920,7 @@
   "com_ui_delete_tool_confirm": "Are you sure you want to delete this tool?",
   "com_ui_delete_tool_save_reminder": "Tool removed. Save the agent to apply changes.",
   "com_ui_deleted": "Deleted",
+  "com_ui_deleting": "Deleting...",
   "com_ui_deleting_file": "Deleting file...",
   "com_ui_descending": "Desc",
   "com_ui_description": "Description",
@@ -1016,6 +1044,7 @@
   "com_ui_handoff_instructions": "Handoff instructions",
   "com_ui_happy_birthday": "It's my 1st birthday!",
   "com_ui_header_format": "Header Format",
+  "com_ui_hide": "Hide",
   "com_ui_hide_code": "Hide Code",
   "com_ui_hide_image_details": "Hide Image Details",
   "com_ui_hide_password": "Hide password",
@@ -1041,6 +1070,7 @@
   "com_ui_instructions": "Instructions",
   "com_ui_key": "Key",
   "com_ui_key_required": "API key is required",
+  "com_ui_last_used": "Last used",
   "com_ui_late_night": "Happy late night",
   "com_ui_latest_footer": "Every AI for Everyone.",
   "com_ui_latest_production_version": "Latest production version",
@@ -1059,12 +1089,18 @@
   "com_ui_manage": "Manage",
   "com_ui_marketplace": "Marketplace",
   "com_ui_marketplace_allow_use": "Allow using Marketplace",
+  "com_ui_max": "Max",
   "com_ui_max_favorites_reached": "Maximum pinned items reached ({{0}}). Unpin an item to add more.",
   "com_ui_max_file_size": "PNG, JPG or JPEG (max {{0}})",
   "com_ui_max_tags": "Maximum number allowed is {{0}}, using latest values.",
   "com_ui_mcp_authenticated_success": "MCP server '{{0}}' authenticated successfully",
+  "com_ui_mcp_click_to_defer": "Click to defer - tool will be discoverable via search but not loaded until needed",
+  "com_ui_mcp_click_to_programmatic": "Enable programmatic calling - tool can only be invoked via code execution",
   "com_ui_mcp_configure_server": "Configure {{0}}",
   "com_ui_mcp_configure_server_description": "Configure custom variables for {{0}}",
+  "com_ui_mcp_defer": "Defer",
+  "com_ui_mcp_defer_all": "Defer all tools",
+  "com_ui_mcp_defer_loading": "Defer loading",
   "com_ui_mcp_dialog_title": "Configure Variables for {{serverName}}. Server Status: {{status}}",
   "com_ui_mcp_domain_not_allowed": "The MCP server domain is not in the allowed domains list. Please contact your administrator.",
   "com_ui_mcp_enter_var": "Enter value for {{0}}",
@@ -1072,8 +1108,11 @@
   "com_ui_mcp_initialize": "Initialize",
   "com_ui_mcp_initialized_success": "MCP server '{{0}}' initialized successfully",
   "com_ui_mcp_invalid_url": "Please enter a valid URL",
+  "com_ui_mcp_no_description": "No description available",
   "com_ui_mcp_oauth_cancelled": "OAuth login cancelled for {{0}}",
   "com_ui_mcp_oauth_timeout": "OAuth login timed out for {{0}}",
+  "com_ui_mcp_programmatic": "Programmatic",
+  "com_ui_mcp_programmatic_all": "Mark all as programmatic",
   "com_ui_mcp_server": "MCP Server",
   "com_ui_mcp_server_connection_failed": "Connection attempt to the provided MCP server failed. Please make sure the URL, the server type, and any authentication configuration are correct, then try again. Also ensure the URL is reachable.",
   "com_ui_mcp_server_created": "MCP server created successfully",
@@ -1093,9 +1132,13 @@
   "com_ui_mcp_servers_allow_share_public": "Allow users to share MCP servers publicly",
   "com_ui_mcp_servers_allow_use": "Allow users to use MCP servers",
   "com_ui_mcp_title_invalid": "Title can only contain letters, numbers, and spaces",
+  "com_ui_mcp_tool_options": "Tool Options",
   "com_ui_mcp_transport": "Transport",
   "com_ui_mcp_type_sse": "SSE",
   "com_ui_mcp_type_streamable_http": "Streamable HTTPS",
+  "com_ui_mcp_undefer": "Undefer",
+  "com_ui_mcp_undefer_all": "Undefer all tools",
+  "com_ui_mcp_unprogrammatic_all": "Unmark all as programmatic",
   "com_ui_mcp_update_var": "Update {{0}}",
   "com_ui_mcp_url": "MCP Server URL",
   "com_ui_medium": "Medium",
@@ -1130,6 +1173,8 @@
   "com_ui_misc": "Misc.",
   "com_ui_model": "Model",
   "com_ui_model_parameters": "Model Parameters",
+  "com_ui_model_parameters_reset": "Model Parameters have been reset.",
+  "com_ui_model_selected": "{{0}} selected",
   "com_ui_more_info": "More info",
   "com_ui_my_prompts": "My Prompts",
   "com_ui_name": "Name",
@@ -1139,6 +1184,7 @@
   "com_ui_new_conversation_title": "New Conversation Title",
   "com_ui_next": "Next",
   "com_ui_no": "No",
+  "com_ui_no_api_keys": "No API keys yet. Create one to get started.",
   "com_ui_no_auth": "No Auth",
   "com_ui_no_bookmarks": "it seems like you have no bookmarks yet. Click on a chat and add a new one",
   "com_ui_no_bookmarks_match": "No bookmarks match your search",
@@ -1174,11 +1220,11 @@
   "com_ui_off": "Off",
   "com_ui_offline": "Offline",
   "com_ui_on": "On",
+  "com_ui_open_archived_chat_new_tab_title": "{{title}} (opens in new tab)",
   "com_ui_open_source_chat_new_tab": "Open Source Chat in New Tab",
   "com_ui_open_source_chat_new_tab_title": "Open Source Chat in New Tab - {{title}}",
   "com_ui_open_var": "Open {{0}}",
   "com_ui_openai": "OpenAI",
-  "com_ui_opens_new_tab": "(opens in new tab)",
   "com_ui_optional": "(optional)",
   "com_ui_page": "Page",
   "com_ui_people": "people",
@@ -1196,6 +1242,7 @@
   "com_ui_privacy_policy": "Privacy policy",
   "com_ui_privacy_policy_url": "Privacy Policy URL",
   "com_ui_prompt": "Prompt",
+  "com_ui_prompt_deleted": "{{0}} deleted",
   "com_ui_prompt_group_button": "{{name}} prompt, {{category}} category",
   "com_ui_prompt_group_button_no_category": "{{name}} prompt",
   "com_ui_prompt_groups": "Prompt Groups List",
@@ -1228,6 +1275,18 @@
   "com_ui_regenerating": "Regenerating...",
   "com_ui_region": "Region",
   "com_ui_reinitialize": "Reinitialize",
+  "com_ui_remote_access": "Remote Access",
+  "com_ui_remote_agent_role_editor": "Editor",
+  "com_ui_remote_agent_role_editor_desc": "Can view and modify the agent via API",
+  "com_ui_remote_agent_role_owner": "API Owner",
+  "com_ui_remote_agent_role_owner_desc": "Full API access and can grant remote access to others",
+  "com_ui_remote_agent_role_viewer": "API Viewer",
+  "com_ui_remote_agent_role_viewer_desc": "Can query the agent via API",
+  "com_ui_remote_agents": "Remote Agents (API)",
+  "com_ui_remote_agents_allow_create": "Allow users to create agents via API",
+  "com_ui_remote_agents_allow_share": "Allow users to grant API access to agents to others",
+  "com_ui_remote_agents_allow_share_public": "Allow users to grant API access to agents to all users",
+  "com_ui_remote_agents_allow_use": "Allow users to create API keys and query agents remotely",
   "com_ui_remove_agent_from_chain": "Remove {{0}} from chain",
   "com_ui_remove_user": "Remove {{0}}",
   "com_ui_rename": "Rename",
@@ -1317,6 +1376,7 @@
   "com_ui_shared_link_not_found": "Shared link not found",
   "com_ui_shared_prompts": "Shared Prompts",
   "com_ui_shop": "Shopping",
+  "com_ui_show": "Show",
   "com_ui_show_all": "Show All",
   "com_ui_show_code": "Show Code",
   "com_ui_show_image_details": "Show Image Details",
@@ -1330,6 +1390,7 @@
   "com_ui_special_var_current_datetime": "Current Date & Time",
   "com_ui_special_var_current_user": "Current User",
   "com_ui_special_var_iso_datetime": "UTC ISO Datetime",
+  "com_ui_special_variable_added": "{{0}} special variable added.",
   "com_ui_special_variables": "Special variables:",
   "com_ui_special_variables_more_info": "You can select special variables from the dropdown: `{{current_date}}` (today's date and day of week), `{{current_datetime}}` (local date and time), `{{utc_iso_datetime}}` (UTC ISO datetime), and `{{current_user}}` (your account name).",
   "com_ui_speech_not_supported": "Your browser does not support speech recognition",
@@ -1374,6 +1435,7 @@
   "com_ui_ui_resource_not_found": "UI Resource not found (index: {{0}})",
   "com_ui_ui_resources": "UI Resources",
   "com_ui_unarchive": "Unarchive",
+  "com_ui_unarchive_conversation": "Unarchive conversation",
   "com_ui_unarchive_error": "Failed to unarchive conversation",
   "com_ui_unavailable": "Unavailable",
   "com_ui_unknown": "Unknown",
@@ -1381,6 +1443,8 @@
   "com_ui_unset": "Unset",
   "com_ui_untitled": "Untitled",
   "com_ui_update": "Update",
+  "com_ui_update_mcp_server": "Update MCP server",
+  "com_ui_updating": "Updating...",
   "com_ui_upload": "Upload",
   "com_ui_upload_agent_avatar": "Successfully updated agent avatar",
   "com_ui_upload_agent_avatar_label": "Upload agent avatar image",
@@ -1447,6 +1511,7 @@
   "com_ui_x_selected": "{{0}} selected",
   "com_ui_xhigh": "Extra High",
   "com_ui_yes": "Yes",
+  "com_ui_your_api_key": "Your API Key",
   "com_ui_zoom": "Zoom",
   "com_ui_zoom_in": "Zoom in",
   "com_ui_zoom_level": "Zoom level",
diff --git a/client/src/locales/i18n.ts b/client/src/locales/i18n.ts
index b9741b2301..cbebd4d5e3 100644
--- a/client/src/locales/i18n.ts
+++ b/client/src/locales/i18n.ts
@@ -22,19 +22,23 @@ import translationJa from './ja/translation.json';
 import translationKa from './ka/translation.json';
 import translationSv from './sv/translation.json';
 import translationKo from './ko/translation.json';
+import translationLt from './lt/translation.json';
 import translationLv from './lv/translation.json';
 import translationTh from './th/translation.json';
 import translationTr from './tr/translation.json';
 import translationUg from './ug/translation.json';
 import translationVi from './vi/translation.json';
 import translationNl from './nl/translation.json';
+import translationNn from './nn/translation.json';
 import translationId from './id/translation.json';
+import translationIs from './is/translation.json';
 import translationHe from './he/translation.json';
 import translationHu from './hu/translation.json';
 import translationHy from './hy/translation.json';
 import translationFi from './fi/translation.json';
 import translationZh_Hans from './zh-Hans/translation.json';
 import translationZh_Hant from './zh-Hant/translation.json';
+import translationSk from './sk/translation.json';
 import translationBo from './bo/translation.json';
 import translationUk from './uk/translation.json';
 import translationBs from './bs/translation.json';
@@ -67,17 +71,21 @@ export const resources = {
   ka: { translation: translationKa },
   sv: { translation: translationSv },
   ko: { translation: translationKo },
+  lt: { translation: translationLt },
   lv: { translation: translationLv },
   th: { translation: translationTh },
   tr: { translation: translationTr },
   ug: { translation: translationUg },
   vi: { translation: translationVi },
   nl: { translation: translationNl },
+  nn: { translation: translationNn },
   id: { translation: translationId },
+  is: { translation: translationIs },
   he: { translation: translationHe },
   hu: { translation: translationHu },
   hy: { translation: translationHy },
   fi: { translation: translationFi },
+  sk: { translation: translationSk },
   bo: { translation: translationBo },
   sl: { translation: translationSl },
   uk: { translation: translationUk },
diff --git a/client/src/locales/is/translation.json b/client/src/locales/is/translation.json
new file mode 100644
index 0000000000..0967ef424b
--- /dev/null
+++ b/client/src/locales/is/translation.json
@@ -0,0 +1 @@
+{}
diff --git a/client/src/locales/ja/translation.json b/client/src/locales/ja/translation.json
index 1438bf8c30..dc2c0d544a 100644
--- a/client/src/locales/ja/translation.json
+++ b/client/src/locales/ja/translation.json
@@ -1164,7 +1164,6 @@
   "com_ui_open_source_chat_new_tab_title": "新しいタブでチャットを開く- {{title}}",
   "com_ui_open_var": "開く {{0}}",
   "com_ui_openai": "OpenAI",
-  "com_ui_opens_new_tab": "(新しいタブで開く)",
   "com_ui_optional": "（任意）",
   "com_ui_page": "ページ",
   "com_ui_people": "人々",
diff --git a/client/src/locales/lt/translation.json b/client/src/locales/lt/translation.json
new file mode 100644
index 0000000000..0967ef424b
--- /dev/null
+++ b/client/src/locales/lt/translation.json
@@ -0,0 +1 @@
+{}
diff --git a/client/src/locales/lv/translation.json b/client/src/locales/lv/translation.json
index f123294a8d..5048c33dcc 100644
--- a/client/src/locales/lv/translation.json
+++ b/client/src/locales/lv/translation.json
@@ -1,8 +1,9 @@
 {
   "chat_direction_left_to_right": "No kreisās uz labo",
   "chat_direction_right_to_left": "No labās uz kreiso",
-  "com_a11y_ai_composing": "Mākslīgais intelekts joprojām veido.",
-  "com_a11y_end": "Mākslīgais intelekts ir pabeidzis atbildi.",
+  "com_a11y_ai_composing": "Mākslīgais intelekts joprojām veido savu atbildi.",
+  "com_a11y_end": "Mākslīgais intelekts ir pabeidzis veidot atbildi.",
+  "com_a11y_selected": "atlasīts",
   "com_a11y_start": "Mākslīgais intelekts ir sācis savu atbildi.",
   "com_agents_agent_card_label": "{{name}} aģents. {{description}}",
   "com_agents_all": "Visi aģenti",
@@ -223,6 +224,7 @@
   "com_endpoint_agent": "Aģents",
   "com_endpoint_agent_placeholder": "Lūdzu, izvēlieties aģentu",
   "com_endpoint_ai": "Mākslīgais intelekts",
+  "com_endpoint_anthropic_effort": "Kontrolē, cik lielu skaitļošanas piepūli piemēro Claude. Mazāka piepūle ietaupa tokenus un samazina ātrumu; lielāka piepūle nodrošina rūpīgākas atbildes. 'Max' ļauj veikt visdziļāko argumentāciju (tikai Opus 4.6).",
   "com_endpoint_anthropic_maxoutputtokens": "Maksimālais atbildē ģenerējamo tokenu skaits. Norādiet zemāku vērtību īsākām atbildēm un augstāku vērtību garākām atbildēm. Piezīme: modeļi var apstāties pirms šī maksimālā skaita sasniegšanas.",
   "com_endpoint_anthropic_prompt_cache": "Uzvednes kešatmiņa ļauj atkārtoti izmantot lielu kontekstu vai instrukcijas API izsaukumos, samazinot izmaksas un ābildes ātrumu.",
   "com_endpoint_anthropic_temp": "Diapazons no 0 līdz 1. Analītiskiem/atbilžu variantiem izmantot temp vērtību tuvāk 0, bet radošiem un ģeneratīviem uzdevumiem — tuvāk 1. Iesakām mainīt šo vai Top P, bet ne abus.",
@@ -264,6 +266,7 @@
   "com_endpoint_default_with_num": "noklusējums: {{0}}",
   "com_endpoint_disable_streaming": "Izslēgt atbilžu straumēšanu un saņemt visu atbildi uzreiz. Noderīgi tādiem modeļiem kā o3, kas pieprasa organizācijas pārbaudi straumēšanai.",
   "com_endpoint_disable_streaming_label": "Atspējot straumēšanu",
+  "com_endpoint_effort": "Piepūle",
   "com_endpoint_examples": "Iestatījumi",
   "com_endpoint_export": "Eksportēt",
   "com_endpoint_export_share": "Eksportēt/kopīgot",
@@ -508,16 +511,20 @@
   "com_nav_lang_german": "Vācu",
   "com_nav_lang_hebrew": "עברית",
   "com_nav_lang_hungarian": "Magyar",
+  "com_nav_lang_icelandic": "Íslenska",
   "com_nav_lang_indonesia": "Indonēziešu",
   "com_nav_lang_italian": "Itāļu",
   "com_nav_lang_japanese": "日本語",
   "com_nav_lang_korean": "한국어",
   "com_nav_lang_latvian": "Latviešu",
+  "com_nav_lang_lithuanian": "Lietuvių",
   "com_nav_lang_norwegian_bokmal": "Norsk Bokmål",
+  "com_nav_lang_norwegian_nynorsk": "Norsk Nynorsk",
   "com_nav_lang_persian": "فارسی",
   "com_nav_lang_polish": "Poļu",
   "com_nav_lang_portuguese": "Portugāļu",
   "com_nav_lang_russian": "Krievu",
+  "com_nav_lang_slovak": "Slovenčina",
   "com_nav_lang_slovenian": "Slovenščina",
   "com_nav_lang_spanish": "Spāņu",
   "com_nav_lang_swedish": "Zviedru",
@@ -533,6 +540,7 @@
   "com_nav_log_out": "Izrakstīties",
   "com_nav_long_audio_warning": "Garāku tekstu apstrāde prasīs ilgāku laiku.",
   "com_nav_maximize_chat_space": "Maksimāli izmantot sarunu telpas izmērus",
+  "com_nav_mcp_access_revoked": "MCP servera piekļuve veiksmīgi atsaukta.",
   "com_nav_mcp_configure_server": "Konfigurēt {{0}}",
   "com_nav_mcp_connect": "Savienot",
   "com_nav_mcp_connect_server": "Savienot {{0}}",
@@ -652,6 +660,8 @@
   "com_ui_advanced": "Paplašinātie uzstādījumi",
   "com_ui_advanced_settings": "Advancētie iestatījumi",
   "com_ui_agent": "Aģents",
+  "com_ui_agent_api_keys": "Aģenta API atslēgas",
+  "com_ui_agent_api_keys_description": "Izveidot API atslēgas, lai attālināti piekļūtu aģentiem, izmantojot API",
   "com_ui_agent_category_aftersales": "Pēcpārdošanas pakalpojumi",
   "com_ui_agent_category_finance": "Finanses",
   "com_ui_agent_category_general": "Vispārīgi",
@@ -706,6 +716,16 @@
   "com_ui_analyzing": "Analīze",
   "com_ui_analyzing_finished": "Analīze pabeigta",
   "com_ui_api_key": "API atslēga",
+  "com_ui_api_key_copied": "API atslēga kopēta starpliktuvē",
+  "com_ui_api_key_create_error": "Neizdevās izveidot API atslēgu",
+  "com_ui_api_key_created": "API atslēga veiksmīgi saglabāta",
+  "com_ui_api_key_delete_error": "Neizdevās izdzēst API atslēgu",
+  "com_ui_api_key_deleted": "API atslēga veiksmīgi dzēsta",
+  "com_ui_api_key_name": "Atslēgas nosaukums",
+  "com_ui_api_key_name_placeholder": "Mana API atslēga",
+  "com_ui_api_key_name_required": "Nepieciešams API atslēgas nosaukums",
+  "com_ui_api_key_warning": "Noteikti nokopējiet savu API atslēgu tūlīt. Jūs to vairs nevarēsiet redzēt!",
+  "com_ui_api_keys_load_error": "Neizdevās ielādēt API atslēgas",
   "com_ui_archive": "Arhīvs",
   "com_ui_archive_delete_error": "Neizdevās izdzēst arhivēto sarunu.",
   "com_ui_archive_error": "Neizdevās arhivēt sarunu.",
@@ -756,6 +776,7 @@
   "com_ui_bookmarks": "Grāmatzīmes",
   "com_ui_bookmarks_add": "Pievienot grāmatzīmi",
   "com_ui_bookmarks_add_to_conversation": "Pievienot pašreizējai sarunai",
+  "com_ui_bookmarks_count_selected": "Grāmatzīmes, {{count}} atlasītas",
   "com_ui_bookmarks_create_error": "Veidojot grāmatzīmi, radās kļūda",
   "com_ui_bookmarks_create_exists": "Šī grāmatzīme jau pastāv",
   "com_ui_bookmarks_create_success": "Grāmatzīme veiksmīgi izveidota",
@@ -835,12 +856,16 @@
   "com_ui_copy_to_clipboard": "Kopēt starpliktuvē",
   "com_ui_copy_url_to_clipboard": "URL kopēšana uz starpliktuvi",
   "com_ui_create": "Izveidot",
+  "com_ui_create_api_key": "Izveidot API atslēgu",
   "com_ui_create_assistant": "Izveidot palīgu",
   "com_ui_create_link": "Izveidot saiti",
+  "com_ui_create_mcp_server": "Izveidot MCP serveri",
   "com_ui_create_memory": "Izveidot atmiņu",
   "com_ui_create_new_agent": "Izveidot jaunu aģentu",
   "com_ui_create_prompt": "Izveidot uzvedni",
   "com_ui_create_prompt_page": "Jauna uzvedņu konfigurācijas lapa",
+  "com_ui_created": "Izveidots",
+  "com_ui_creating": "Notiek izveide...",
   "com_ui_creating_image": "Attēla izveide. Var aizņemt brīdi.",
   "com_ui_current": "Pašreizējais",
   "com_ui_currently_production": "Pašlaik produkcijā",
@@ -880,6 +905,9 @@
   "com_ui_delete_confirm_prompt_version_var": "Šī darbība izdzēsīs atlasīto versiju \"{{0}}\" Ja citu versiju nebūs pieejamu, uzvedne tiks dzēsta.",
   "com_ui_delete_confirm_strong": "Šis izdzēsīs <strong>{{title}}</strong>",
   "com_ui_delete_conversation": "Dzēst sarunu?",
+  "com_ui_delete_conversation_tooltip": "Dzēst sarunu",
+  "com_ui_delete_mcp_server": "Vai dzēst MCP serveri?",
+  "com_ui_delete_mcp_server_name": "Dzēst MCP serveri {{0}}",
   "com_ui_delete_memory": "Dzēst atmiņu",
   "com_ui_delete_not_allowed": "Dzēšanas darbība nav atļauta",
   "com_ui_delete_preset": "Vai dzēst iestatījumu?",
@@ -892,6 +920,7 @@
   "com_ui_delete_tool_confirm": "Vai tiešām vēlaties dzēst šo rīku?",
   "com_ui_delete_tool_save_reminder": "Rīks noņemts. Saglabājiet aģentu, lai piemērotu izmaiņas.",
   "com_ui_deleted": "Dzēsts",
+  "com_ui_deleting": "Dzēš...",
   "com_ui_deleting_file": "Dzēšu failu...",
   "com_ui_descending": "Dilstošs",
   "com_ui_description": "Apraksts",
@@ -1017,6 +1046,7 @@
   "com_ui_handoff_instructions": "Nodošanas instrukcijas",
   "com_ui_happy_birthday": "Man šodien ir pirmā dzimšanas diena!",
   "com_ui_header_format": "Galvenes formāts",
+  "com_ui_hide": "Paslēpt",
   "com_ui_hide_code": "Slēpt kodu",
   "com_ui_hide_image_details": "Slēpt attēla detaļas",
   "com_ui_hide_password": "Paslēpt paroli",
@@ -1042,6 +1072,7 @@
   "com_ui_instructions": "Instrukcijas",
   "com_ui_key": "Atslēga",
   "com_ui_key_required": "Nepieciešama API atslēga",
+  "com_ui_last_used": "Pēdējais izmantotais",
   "com_ui_late_night": "Priecīgu vēlu nakti",
   "com_ui_latest_footer": "Mākslīgais intelekts ikvienam.",
   "com_ui_latest_production_version": "Jaunākā produkcijas versija",
@@ -1060,12 +1091,18 @@
   "com_ui_manage": "Pārvaldīt",
   "com_ui_marketplace": "Katalogs",
   "com_ui_marketplace_allow_use": "Atļaut izmantot katalogu",
+  "com_ui_max": "Maksimums",
   "com_ui_max_favorites_reached": "Sasniegts maksimālais piesprausto elementu skaits ({{0}}). Atvienojiet elementu, lai pievienotu citu.",
   "com_ui_max_file_size": "PNG, JPG vai JPEG (maks. {{0}})",
   "com_ui_max_tags": "Maksimālais atļautais skaits ir {{0}}, izmantojot jaunākās vērtības.",
   "com_ui_mcp_authenticated_success": "MCP serveris '{{0}}' veiksmīgi autentificēts",
+  "com_ui_mcp_click_to_defer": "Noklikšķiniet, lai atliktu — rīks būs atrodams, izmantojot meklēšanu, bet netiks ielādēts, līdz tas būs nepieciešams",
+  "com_ui_mcp_click_to_programmatic": "Iespējot programmatisku izsaukšanu — rīku var izsaukt tikai, izpildot kodu",
   "com_ui_mcp_configure_server": "Konfigurēt {{0}}",
   "com_ui_mcp_configure_server_description": "Konfigurējiet pielāgotus mainīgos {{0}}",
+  "com_ui_mcp_defer": "Atlikt",
+  "com_ui_mcp_defer_all": "Atlikt visus rīkus",
+  "com_ui_mcp_defer_loading": "Atlikt ielādi",
   "com_ui_mcp_dialog_title": "Mainīgo konfigurēšana {{serverName}}. Servera statuss: {{status}}",
   "com_ui_mcp_domain_not_allowed": "MCP servera domēna nav atļauto domēnu sarakstā. Lūdzu, sazinieties ar savu administratoru.",
   "com_ui_mcp_enter_var": "Ievadiet vērtību {{0}}",
@@ -1073,8 +1110,11 @@
   "com_ui_mcp_initialize": "Inicializēt",
   "com_ui_mcp_initialized_success": "MCP serveris '{{0}}' veiksmīgi inicializēts",
   "com_ui_mcp_invalid_url": "Lūdzu, ievadiet derīgu URL.",
+  "com_ui_mcp_no_description": "Apraksts nav pieejams",
   "com_ui_mcp_oauth_cancelled": "OAuth pieteikšanās atcelta {{0}}",
   "com_ui_mcp_oauth_timeout": "OAuth pieteikšanās beidzās priekš {{0}}",
+  "com_ui_mcp_programmatic": "Programmatisks",
+  "com_ui_mcp_programmatic_all": "Atzīmēt visus kā programmatiskus",
   "com_ui_mcp_server": "MCP serveris",
   "com_ui_mcp_server_connection_failed": "Savienojuma mēģinājums ar norādīto MCP serveri neizdevās. Lūdzu, pārliecinieties, ka URL, servera tips un autentifikācijas konfigurācija ir pareiza, un pēc tam mēģiniet vēlreiz. Pārliecinieties arī, vai URL ir sasniedzams.",
   "com_ui_mcp_server_created": "Veiksmīgi izveidots MCP serveris",
@@ -1094,9 +1134,13 @@
   "com_ui_mcp_servers_allow_share_public": "Ļaujiet lietotājiem publiski koplietot MCP serverus",
   "com_ui_mcp_servers_allow_use": "Atļaut lietotājiem izmantot MCP serverus",
   "com_ui_mcp_title_invalid": "Virsrakstā var būt tikai burti, cipari un atstarpes.",
+  "com_ui_mcp_tool_options": "Rīka opcijas",
   "com_ui_mcp_transport": "Transports",
   "com_ui_mcp_type_sse": "SSE",
   "com_ui_mcp_type_streamable_http": "Straumējams HTTPS",
+  "com_ui_mcp_undefer": "Neatlikt",
+  "com_ui_mcp_undefer_all": "Atcelt visu rīku atlikšanu",
+  "com_ui_mcp_unprogrammatic_all": "Noņemiet visus kā programmatiskus",
   "com_ui_mcp_update_var": "Atjaunināt {{0}}",
   "com_ui_mcp_url": "MCP servera URL",
   "com_ui_medium": "Vidējs",
@@ -1131,6 +1175,8 @@
   "com_ui_misc": "Dažādi",
   "com_ui_model": "Modelis",
   "com_ui_model_parameters": "Modeļa Parametrus",
+  "com_ui_model_parameters_reset": "Modeļa parametri ir atiestatīti.",
+  "com_ui_model_selected": "{{0}} atlasīts",
   "com_ui_more_info": "Vairāk informācijas",
   "com_ui_my_prompts": "Manas uzvednes",
   "com_ui_name": "Vārds",
@@ -1140,6 +1186,7 @@
   "com_ui_new_conversation_title": "Jaunas sarunas nosaukums",
   "com_ui_next": "Nākamais",
   "com_ui_no": "Nē",
+  "com_ui_no_api_keys": "Vēl nav API atslēgu. Izveidojiet vienu, lai sāktu.",
   "com_ui_no_auth": "Nav autorizācijas",
   "com_ui_no_bookmarks": "Šķiet, ka jums vēl nav grāmatzīmju. Noklikšķiniet uz sarunas un pievienojiet jaunu.",
   "com_ui_no_bookmarks_match": "Nav atbilstošu grāmatzīmju meklēšanas vaicājumam",
@@ -1175,11 +1222,11 @@
   "com_ui_off": "Izslēgts",
   "com_ui_offline": "Bezsaistē",
   "com_ui_on": "Ieslēgts",
+  "com_ui_open_archived_chat_new_tab_title": "{{title}} (atveras jaunā cilnē)",
   "com_ui_open_source_chat_new_tab": "Atvērtā koda saruna jaunā cilnē",
   "com_ui_open_source_chat_new_tab_title": "Atvērtā koda saruna jaunā cilnē - {{title}}",
   "com_ui_open_var": "Atvērt {{0}}",
   "com_ui_openai": "OpenAI",
-  "com_ui_opens_new_tab": "(atveras jaunā cilnē)",
   "com_ui_optional": "(pēc izvēles)",
   "com_ui_page": "Lapa",
   "com_ui_people": "cilvēki",
@@ -1197,6 +1244,7 @@
   "com_ui_privacy_policy": "Privātuma politika",
   "com_ui_privacy_policy_url": "Privātuma politika web adrese",
   "com_ui_prompt": "Uzvedne",
+  "com_ui_prompt_deleted": "{{0}} dzēsts",
   "com_ui_prompt_group_button": "{{name}} uzvedne, {{category}} kategorija",
   "com_ui_prompt_group_button_no_category": "{{name}} uzvedne.",
   "com_ui_prompt_groups": "Uzvedņu grupu saraksts",
@@ -1229,6 +1277,18 @@
   "com_ui_regenerating": "Atjaunojas...",
   "com_ui_region": "Reģions",
   "com_ui_reinitialize": "Reinicializēt",
+  "com_ui_remote_access": "Attālinātā piekļuve",
+  "com_ui_remote_agent_role_editor": "Redaktors",
+  "com_ui_remote_agent_role_editor_desc": "Var skatīt un modificēt aģentu, izmantojot API",
+  "com_ui_remote_agent_role_owner": "API īpašnieks",
+  "com_ui_remote_agent_role_owner_desc": "Pilna API piekļuve un var piešķirt attālo piekļuvi citiem",
+  "com_ui_remote_agent_role_viewer": "API skatītājs",
+  "com_ui_remote_agent_role_viewer_desc": "Var veikt vaicājumu aģentam, izmantojot API",
+  "com_ui_remote_agents": "Attālinātie aģenti (API)",
+  "com_ui_remote_agents_allow_create": "Atļaut lietotājiem izveidot aģentus, izmantojot API",
+  "com_ui_remote_agents_allow_share": "Atļaut lietotājiem piešķirt API piekļuvi aģentiem citiem lietotājiem",
+  "com_ui_remote_agents_allow_share_public": "Atļaut lietotājiem piešķirt API piekļuvi aģentiem visiem lietotājiem",
+  "com_ui_remote_agents_allow_use": "Atļaut lietotājiem attālināti izveidot API atslēgas un vaicājumu aģentus",
   "com_ui_remove_agent_from_chain": "Noņemt {{0}} no ķēdes",
   "com_ui_remove_user": "Noņemt {{0}}",
   "com_ui_rename": "Pārdēvēt",
@@ -1318,6 +1378,7 @@
   "com_ui_shared_link_not_found": "Kopīgotā saite nav atrasta",
   "com_ui_shared_prompts": "Kopīgotas uzvednes",
   "com_ui_shop": "Iepirkšanās",
+  "com_ui_show": "Rādīt",
   "com_ui_show_all": "Rādīt visu",
   "com_ui_show_code": "Rādīt kodu",
   "com_ui_show_image_details": "Rādīt attēla detaļas",
@@ -1331,6 +1392,7 @@
   "com_ui_special_var_current_datetime": "Pašreizējais datums un laiks",
   "com_ui_special_var_current_user": "Pašreizējais lietotājs",
   "com_ui_special_var_iso_datetime": "UTC ISO datums un laiks",
+  "com_ui_special_variable_added": "{{0}} pievienots īpašs mainīgais.",
   "com_ui_special_variables": "Īpašie mainīgie:",
   "com_ui_special_variables_more_info": "Nolaižamajā izvēlnē varat atlasīt īpašos mainīgos:{{current_date}}` (šodienas datums un nedēļas diena), `{{current_datetime}}` (vietējais datums un laiks), `{{utc_iso_datetime}}` (UTC ISO datums/laiks) un `{{current_user}} (jūsu lietotāja vārds).",
   "com_ui_speech_not_supported": "Jūsu pārlūkprogramma neatbalsta runas atpazīšanu",
@@ -1375,6 +1437,7 @@
   "com_ui_ui_resource_not_found": "UI Resurss nav atrasts (indekss: {{0}})",
   "com_ui_ui_resources": "Lietotāja saskarnes resursi",
   "com_ui_unarchive": "Atarhivēt",
+  "com_ui_unarchive_conversation": "Atarhivēt sarunu",
   "com_ui_unarchive_error": "Neizdevās atarhivēt sarunu",
   "com_ui_unavailable": "Nav pieejams",
   "com_ui_unknown": "Nezināms",
@@ -1382,6 +1445,8 @@
   "com_ui_unset": "Neuzlikts",
   "com_ui_untitled": "Bez nosaukuma",
   "com_ui_update": "Atjauninājums",
+  "com_ui_update_mcp_server": "Atjaunināt MCP serveri",
+  "com_ui_updating": "Atjaunina...",
   "com_ui_upload": "Augšupielādēt",
   "com_ui_upload_agent_avatar": "Aģenta avatars veiksmīgi atjaunināts",
   "com_ui_upload_agent_avatar_label": "Augšupielādēt aģenta avatāra attēlu",
@@ -1397,7 +1462,7 @@
   "com_ui_upload_image_input": "Augšupielādēt failu kā attēlu",
   "com_ui_upload_invalid": "Nederīgs augšupielādējamais fails. Attēlam jābūt tādam, kas nepārsniedz ierobežojumu.",
   "com_ui_upload_invalid_var": "Nederīgs augšupielādējams fails. Attēlam jābūt ne lielākam par {{0}} MB",
-  "com_ui_upload_ocr_text": "Augšupielādēt failu kā tekstu",
+  "com_ui_upload_ocr_text": "Augšupielādēt failu kā kontekstu",
   "com_ui_upload_provider": "Augšupielādēt pakalpojumu sniedzējam",
   "com_ui_upload_success": "Fails veiksmīgi augšupielādēts",
   "com_ui_upload_type": "Izvēlieties augšupielādes veidu",
@@ -1448,6 +1513,7 @@
   "com_ui_x_selected": "{{0}} atlasīts",
   "com_ui_xhigh": "Īpaši augsts",
   "com_ui_yes": "Jā",
+  "com_ui_your_api_key": "Tava API atslēga",
   "com_ui_zoom": "Tālummaiņa",
   "com_ui_zoom_in": "Pietuvināt",
   "com_ui_zoom_level": "Pietuvināšanas līmenis",
diff --git a/client/src/locales/nb/translation.json b/client/src/locales/nb/translation.json
index 153e4255bf..f5b1943b39 100644
--- a/client/src/locales/nb/translation.json
+++ b/client/src/locales/nb/translation.json
@@ -1,13 +1,15 @@
 {
-  "chat_direction_left_to_right": "Noe bør legges inn her. Tomt felt.",
-  "chat_direction_right_to_left": "Noe bør legges inn her. Tomt felt.",
+  "chat_direction_left_to_right": "Venstre til høyre",
+  "chat_direction_right_to_left": "Høyre til venstre",
   "com_a11y_ai_composing": "KI-en skriver fortsatt.",
   "com_a11y_end": "KI-en har fullført svaret sitt.",
+  "com_a11y_selected": "valgt",
   "com_a11y_start": "KI-en har begynt å svare.",
   "com_agents_agent_card_label": "{{name}}-agent. {{description}}",
   "com_agents_all": "Alle agenter",
   "com_agents_all_category": "Alle",
   "com_agents_all_description": "Utforsk delte agenter på tvers av alle kategorier",
+  "com_agents_avatar_upload_error": "Kunne ikke laste opp agentavatar",
   "com_agents_by_librechat": "av LibreChat",
   "com_agents_category_aftersales": "Salgsoppfølging",
   "com_agents_category_aftersales_description": "Agenter for kundeservice, support og oppfølging etter et gjennomført salg.",
@@ -26,6 +28,7 @@
   "com_agents_category_sales_description": "Agenter som bistår i salgsprosesser og med kundekontakt.",
   "com_agents_category_tab_label": "Kategorien {{category}}, {{position}} av {{total}}",
   "com_agents_category_tabs_label": "Agentkategorier",
+  "com_agents_chat_with": "Chat med {{navn}}",
   "com_agents_clear_search": "Tøm søket",
   "com_agents_code_interpreter": "Når aktivert, kan agenten din bruke LibreChat Code Interpreter API for å kjøre generert kode sikkert, inkludert filbehandling. Krever en gyldig API-nøkkel.",
   "com_agents_code_interpreter_title": "Code Interpreter API",
@@ -33,6 +36,7 @@
   "com_agents_copy_link": "Kopier lenke",
   "com_agents_create_error": "Det oppstod en feil under oppretting av agenten.",
   "com_agents_created_by": "av",
+  "com_agents_description_card": "Beskrivelse: {{description}}",
   "com_agents_description_placeholder": "Valgfritt: Beskriv agenten din her.",
   "com_agents_empty_state_heading": "Ingen agenter funnet",
   "com_agents_enable_file_search": "Aktiver filsøk",
@@ -59,7 +63,9 @@
   "com_agents_error_timeout_suggestion": "Sjekk internettforbindelsen din og prøv igjen.",
   "com_agents_error_timeout_title": "Tidsavbrudd for tilkobling",
   "com_agents_error_title": "Noe gikk galt",
+  "com_agents_file_context_description": "Filer lastet opp som \"Kontekst\" er analysert son tekst for å supplementere agenten sine instruksjoner. Dersom OCR er tilgjengelig, eller er konfigurert for den opplastede filtypen, vil prosessen bli brukt til å hente ut tekst. Dette er ideelt for dokumenter, bilder med tekst, eller PDFer som krever det fulle tekstinnholdet i en fil.",
   "com_agents_file_context_disabled": "Agenten må være opprettet før du kan laste opp filer for filkontekst.",
+  "com_agents_file_context_label": "Filkontekst",
   "com_agents_file_search_disabled": "Agenten må være opprettet før du kan laste opp filer for filsøk.",
   "com_agents_file_search_info": "Når dette er aktivert, vil agenten bruke de eksakte filnavnene listet nedenfor for å hente relevant kontekst fra disse filene.",
   "com_agents_grid_announcement": "Viser {{count}} agenter i kategorien {{category}}.",
@@ -87,7 +93,7 @@
   "com_agents_search_empty_heading": "Ingen søkeresultater",
   "com_agents_search_info": "Når aktivert, kan agenten din søke på nettet for oppdatert informasjon. Krever en gyldig API-nøkkel.",
   "com_agents_search_instructions": "Skriv for å søke etter agenter etter navn eller beskrivelse.",
-  "com_agents_search_name": "Søk agenter etter navn",
+  "com_agents_search_name": "Søk etter agenter ved navn",
   "com_agents_search_no_results": "Ingen agenter funnet for «{{query}}».",
   "com_agents_search_placeholder": "Søk agenter ...",
   "com_agents_see_more": "Se mer",
@@ -139,6 +145,7 @@
   "com_assistants_update_actions_success": "Handlingen ble opprettet eller oppdatert.",
   "com_assistants_update_error": "Det oppstod en feil under oppdatering av assistenten.",
   "com_assistants_update_success": "Oppdatering fullført",
+  "com_assistants_update_success_name": "Oppdatering av {{name}} vellykket",
   "com_auth_already_have_account": "Har du allerede en konto?",
   "com_auth_apple_login": "Logg inn med Apple",
   "com_auth_back_to_login": "Tilbake til innlogging",
@@ -217,10 +224,11 @@
   "com_endpoint_agent": "Agent",
   "com_endpoint_agent_placeholder": "Velg en agent",
   "com_endpoint_ai": "KI",
+  "com_endpoint_anthropic_effort": "Kontrollerer hvor mye innsats Claude legger i beregning. Lavere innsats sparer tokens og reduserer treghet, høyere innsats produserer mer gjennom responser. \"Maks\" gir den høyeste graden av resonnering (kun Opus 4.6)",
   "com_endpoint_anthropic_maxoutputtokens": "Maksimalt antall tokens som kan genereres i svaret. Angi en lavere verdi for kortere svar og en høyere verdi for lengre svar. Merk: Modeller kan stoppe før de når dette maksimumet.",
   "com_endpoint_anthropic_prompt_cache": "Prompt-mellomlagring gjør det mulig å gjenbruke stor kontekst eller instruksjoner på tvers av API-kall, noe som reduserer kostnader og ventetid.",
   "com_endpoint_anthropic_temp": "Varierer fra 0 til 1. Bruk en temperatur nærmere 0 for analytiske oppgaver, og nærmere 1 for kreative og generative oppgaver. Vi anbefaler å endre enten denne eller Topp P, men ikke begge.",
-  "com_endpoint_anthropic_thinking": "Aktiverer intern resonnering for støttede Claude-modeller (f.eks. 3.7 Sonnet). Merk: Krever at \"Tenkebudsjett\" er satt og er lavere enn \"Maks utdata-tokens\".",
+  "com_endpoint_anthropic_thinking": "Aktiverer intern resonnering for støttede Claude-modeller. For nyere modeller (Opus 4.6+) brukes adaptiv tenkning kontrollert av Effort-parameteren. For eldre modeller kreves det at \"Thinking Budget\" er satt og lavere enn \"Max Output Tokens\".",
   "com_endpoint_anthropic_thinking_budget": "Bestemmer det maksimale antallet tokens Claude kan bruke for sin interne resonneringsprosess. Et større budsjett kan forbedre svarkvaliteten for komplekse problemer. Denne verdien må være lavere enn \"Maks utdata-tokens\".",
   "com_endpoint_anthropic_topk": "Top-k endrer hvordan modellen velger tokens for utdata. En top-k på 1 betyr at det valgte tokenet er det mest sannsynlige (grådig dekoding). En top-k på 3 betyr at det neste tokenet velges blant de 3 mest sannsynlige (ved hjelp av temperatur).",
   "com_endpoint_anthropic_topp": "Top-p endrer hvordan modellen velger tokens for utdata. Tokens velges fra de mest sannsynlige til summen av sannsynlighetene deres er lik top-p-verdien.",
@@ -258,6 +266,7 @@
   "com_endpoint_default_with_num": "standard: {{0}}",
   "com_endpoint_disable_streaming": "Deaktiver strømming av svar og motta hele svaret på en gang. Nyttig for modeller som krever organisasjonsverifisering for strømming.",
   "com_endpoint_disable_streaming_label": "Deaktiver strømming",
+  "com_endpoint_effort": "Innsats",
   "com_endpoint_examples": "Forhåndsinnstillinger",
   "com_endpoint_export": "Eksporter",
   "com_endpoint_export_share": "Eksporter/Del",
@@ -274,7 +283,7 @@
   "com_endpoint_instructions_assistants_placeholder": "Overstyrer assistentens instruksjoner. Nyttig for å endre atferden for en enkelt kjøring.",
   "com_endpoint_max_output_tokens": "Maks utdata-tokens",
   "com_endpoint_message": "Melding",
-  "com_endpoint_message_new": "Melding {{0}}",
+  "com_endpoint_message_new": "Send melding til {{0}}",
   "com_endpoint_message_not_appendable": "Rediger meldingen din eller regenerer.",
   "com_endpoint_my_preset": "Min forhåndsinnstilling",
   "com_endpoint_no_presets": "Ingen forhåndsinnstillinger ennå. Bruk innstillingsknappen for å lage en.",
@@ -308,6 +317,7 @@
   "com_endpoint_preset_default_removed": "er ikke lenger standard forhåndsinnstilling.",
   "com_endpoint_preset_delete_confirm": "Er du sikker på at du vil slette denne forhåndsinnstillingen?",
   "com_endpoint_preset_delete_error": "Det oppstod en feil under sletting av forhåndsinnstillingen. Vennligst prøv igjen.",
+  "com_endpoint_preset_delete_success": "Sletting av forhåndsinnstilling vellykket",
   "com_endpoint_preset_import": "Forhåndsinnstilling importert!",
   "com_endpoint_preset_import_error": "Det oppstod en feil under importering av forhåndsinnstillingen. Vennligst prøv igjen.",
   "com_endpoint_preset_name": "Navn på forhåndsinnstilling",
@@ -348,6 +358,7 @@
   "com_error_files_process": "Det oppstod en feil under behandling av filen.",
   "com_error_files_upload": "Det oppstod en feil under opplasting av filen.",
   "com_error_files_upload_canceled": "Forespørselen om filopplasting ble avbrutt. Merk: Filopplastingen kan fortsatt behandles og må slettes manuelt.",
+  "com_error_files_upload_too_large": "Filen er for stor. Vennligst last opp en fil som er mindre enn {{}} MB",
   "com_error_files_validation": "Det oppstod en feil under validering av filen.",
   "com_error_google_tool_conflict": "Bruk av innebygde Google-verktøy støttes ikke sammen med eksterne verktøy. Deaktiver enten de innebygde eller de eksterne verktøyene.",
   "com_error_heic_conversion": "Konvertering av HEIC-bilde til JPEG mislyktes. Prøv å konvertere bildet manuelt eller bruk et annet format.",
@@ -360,6 +371,7 @@
   "com_error_moderation": "Innholdet du sendte inn ble flagget av vårt moderasjonssystem. Vi kan ikke fortsette med dette emnet. Rediger meldingen din eller start en ny samtale.",
   "com_error_no_base_url": "Ingen base-URL funnet. Oppgi en og prøv igjen.",
   "com_error_no_user_key": "Ingen nøkkel funnet. Oppgi en nøkkel og prøv igjen.",
+  "com_error_refusal": "Responsen ble avslått av sikkerhetsfiltere. Skriv om på meldingen din og prøv igjen. Dersom denne feilmeldingen forekommer ofte imens du bruker Claude Sonnet 4.5 eller Opus 4.1, kan du prøve Sonnet 4, som har andre bruksrestriksjoner.",
   "com_file_pages": "Sider: {{pages}}",
   "com_file_source": "Fil",
   "com_file_unknown": "Ukjent fil",
@@ -368,11 +380,14 @@
   "com_files_download_progress": "{{0}} av {{1}} filer",
   "com_files_downloading": "Laster ned filer",
   "com_files_filter": "Filtrer filer ...",
+  "com_files_filter_by": "Filtrer filer etter...",
   "com_files_no_results": "Ingen resultater.",
   "com_files_number_selected": "{{0}} av {{1}} valgt",
   "com_files_preparing_download": "Forbereder nedlasting ...",
+  "com_files_result_found": "{{count}} resultater funnet",
+  "com_files_results_found": "{{count}} resultater funnet",
   "com_files_sharepoint_picker_title": "Velg filer",
-  "com_files_table": "[Plassholder: Tabell over filer]",
+  "com_files_table": "Fil-tabell",
   "com_files_upload_local_machine": "Fra lokal datamaskin",
   "com_files_upload_sharepoint": "Fra SharePoint",
   "com_generated_files": "Genererte filer:",
@@ -421,6 +436,7 @@
   "com_nav_chat_commands": "Samtalekommandoer",
   "com_nav_chat_commands_info": "Disse kommandoene aktiveres ved å skrive bestemte tegn i begynnelsen av meldingen din. Hver kommando utløses av sitt angitte prefiks. Du kan deaktivere dem hvis du ofte bruker disse tegnene til å starte meldinger.",
   "com_nav_chat_direction": "Samtaleretning",
+  "com_nav_chat_direction_selected": "Chat retning: {{direction}}",
   "com_nav_clear_all_chats": "Fjern alle samtaler",
   "com_nav_clear_cache_confirm_message": "Er du sikker på at du vil tømme mellomlageret?",
   "com_nav_clear_conversation": "Fjern samtaler",
@@ -428,9 +444,11 @@
   "com_nav_close_sidebar": "Lukk sidefelt",
   "com_nav_commands": "Kommandoer",
   "com_nav_confirm_clear": "Bekreft fjerning",
+  "com_nav_control_panel": "Kontrollpanel",
   "com_nav_conversation_mode": "Samtalemodus",
   "com_nav_convo_menu_options": "Samtalemenyvalg",
   "com_nav_db_sensitivity": "Desibelfølsomhet",
+  "com_nav_default_temporary_chat": "Midlertidig Chat som standard",
   "com_nav_delete_account": "Slett konto",
   "com_nav_delete_account_button": "Slett kontoen min permanent",
   "com_nav_delete_account_confirm": "Slett konto – er du sikker?",
@@ -464,6 +482,7 @@
   "com_nav_info_code_artifacts": "Aktiverer visning av eksperimentelle kodeartefakter ved siden av samtalen.",
   "com_nav_info_code_artifacts_agent": "Aktiverer bruk av kodeartefakter for denne agenten. Som standard legges det til tilleggsinstruksjoner for bruk av artefakter, med mindre \"Egendefinert prompt-modus\" er aktivert.",
   "com_nav_info_custom_prompt_mode": "Når aktivert, vil standard systemprompt for artefakter ikke bli inkludert. Alle instruksjoner for å generere artefakter må gis manuelt i denne modusen.",
+  "com_nav_info_default_temporary_chat": "Når dette er påskrudd vil nye chatter starte med \"midlertidig chat\" som standard. Midlertidige chatter blir ikke lagret til historikken din.",
   "com_nav_info_enter_to_send": "Når aktivert, vil et trykk på `ENTER` sende meldingen din. Når deaktivert, vil et trykk på Enter legge til en ny linje. Du må da trykke `CTRL + ENTER` / `⌘ + ENTER` for å sende.",
   "com_nav_info_fork_change_default": "`Kun synlige meldinger` inkluderer bare den direkte stien til den valgte meldingen. `Inkluder relaterte grener` legger til grener langs stien. `Inkluder alt til/fra her` inkluderer alle tilknyttede meldinger og grener.",
   "com_nav_info_fork_split_target_setting": "Når aktivert, vil forgreningen starte fra målmeldingen til den siste meldingen i samtalen, i henhold til den valgte atferden.",
@@ -473,6 +492,7 @@
   "com_nav_info_save_draft": "Når aktivert, vil teksten og vedleggene du skriver inn bli lagret lokalt som et utkast. Utkastet er tilgjengelig selv om du laster siden på nytt eller bytter samtale. Utkastet slettes når meldingen er sendt.",
   "com_nav_info_show_thinking": "Når aktivert, vil tenke-nedtrekksmenyene vises som standard, slik at du kan se KI-ens resonnement i sanntid. Når deaktivert, vil de være lukket for et renere grensesnitt.",
   "com_nav_info_user_name_display": "Når aktivert, vil brukernavnet ditt vises over hver melding du sender. Når deaktivert, vil du bare se \"Du\" over meldingene dine.",
+  "com_nav_keep_screen_awake": "Hold skjermen på gjennom generering av respons",
   "com_nav_lang_arabic": "Arabisk (العربية)",
   "com_nav_lang_armenian": "Armensk (Հայերեն)",
   "com_nav_lang_auto": "Automatisk gjenkjenning",
@@ -491,16 +511,20 @@
   "com_nav_lang_german": "Tysk (Deutsch)",
   "com_nav_lang_hebrew": "Hebraisk (עברית)",
   "com_nav_lang_hungarian": "Ungarsk (Magyar)",
+  "com_nav_lang_icelandic": "Islandsk",
   "com_nav_lang_indonesia": "Indonesisk (Indonesia)",
   "com_nav_lang_italian": "Italiensk (Italiano)",
   "com_nav_lang_japanese": "Japansk (日本語)",
   "com_nav_lang_korean": "Koreansk (한국어)",
   "com_nav_lang_latvian": "Latvisk (Latviski)",
+  "com_nav_lang_lithuanian": "Litauisk",
   "com_nav_lang_norwegian_bokmal": "Norsk bokmål",
+  "com_nav_lang_norwegian_nynorsk": "Norsk nynorsk",
   "com_nav_lang_persian": "Persisk (فارسی)",
   "com_nav_lang_polish": "Polsk (Polski)",
   "com_nav_lang_portuguese": "Portugisisk (Português)",
   "com_nav_lang_russian": "Russisk (Русский)",
+  "com_nav_lang_slovak": "Slovensk",
   "com_nav_lang_slovenian": "Slovensk",
   "com_nav_lang_spanish": "Spansk (Español)",
   "com_nav_lang_swedish": "Svensk (Svenska)",
@@ -516,8 +540,18 @@
   "com_nav_log_out": "Logg ut",
   "com_nav_long_audio_warning": "Lengre tekster vil ta lengre tid å behandle.",
   "com_nav_maximize_chat_space": "Maksimer samtaleplass",
+  "com_nav_mcp_access_revoked": "Tilbakekalling av MCP servertilgang vellykket.",
   "com_nav_mcp_configure_server": "Konfigurer {{0}}",
+  "com_nav_mcp_connect": "Koble til",
+  "com_nav_mcp_connect_server": "Koble til {{0}}",
+  "com_nav_mcp_reconnect": "Koble til på nytt",
+  "com_nav_mcp_status_connected": "Tilkoblet",
   "com_nav_mcp_status_connecting": "{{0}} - Kobler til",
+  "com_nav_mcp_status_disconnected": "Frakoblet",
+  "com_nav_mcp_status_error": "Feil",
+  "com_nav_mcp_status_initializing": "Starter",
+  "com_nav_mcp_status_needs_auth": "Trenger Auth",
+  "com_nav_mcp_status_unknown": "Ukjent",
   "com_nav_mcp_vars_update_error": "Feil ved oppdatering av egendefinerte MCP-brukervariabler.",
   "com_nav_mcp_vars_updated": "Egendefinerte MCP-brukervariabler ble oppdatert.",
   "com_nav_modular_chat": "Aktiver bytte av endepunkter midt i en samtale",
@@ -538,6 +572,7 @@
   "com_nav_setting_balance": "Saldo",
   "com_nav_setting_chat": "Samtale",
   "com_nav_setting_data": "Datakontroll",
+  "com_nav_setting_delay": "Forsinkelse (s)",
   "com_nav_setting_general": "Generelt",
   "com_nav_setting_mcp": "MCP-innstillinger",
   "com_nav_setting_personalization": "Personalisering",
@@ -555,6 +590,7 @@
   "com_nav_theme_dark": "Mørkt",
   "com_nav_theme_light": "Lyst",
   "com_nav_theme_system": "System",
+  "com_nav_toggle_sidebar": "Skru sidebar av/på",
   "com_nav_tool_dialog": "Assistentverktøy",
   "com_nav_tool_dialog_agents": "Agentverktøy",
   "com_nav_tool_dialog_description": "Assistenten må lagres for at verktøyvalg skal vedvare.",
@@ -605,17 +641,27 @@
   "com_ui_action_button": "Handlingsknapp",
   "com_ui_active": "Aktiv",
   "com_ui_add": "Legg til",
+  "com_ui_add_code_interpreter_api_key": "Legg til kodetolk API nøkkel",
+  "com_ui_add_first_bookmark": "Klikk på en chat for å legge til",
+  "com_ui_add_first_mcp_server": "Lag din første MCP server for å komme i gang",
+  "com_ui_add_first_prompt": "Lag din første prompt for å komme i gang",
   "com_ui_add_mcp": "Legg til MCP",
   "com_ui_add_mcp_server": "Legg til MCP-server",
   "com_ui_add_model_preset": "Legg til en modell eller forhåndsinnstilling for et ekstra svar.",
   "com_ui_add_multi_conversation": "Legg til flersamtale",
+  "com_ui_add_special_variables": "Legg til spesialvariable",
+  "com_ui_add_web_search_api_keys": "Legg til nettsøk API-nøkler",
   "com_ui_adding_details": "Legger til detaljer",
+  "com_ui_additional_details": "Flere detaljer",
   "com_ui_admin": "Admin",
   "com_ui_admin_access_warning": "Deaktivering av admin-tilgang til denne funksjonen kan forårsake uventede UI-problemer. Hvis lagret, kan dette kun tilbakestilles via konfigurasjonsfilen (librechat.yaml).",
   "com_ui_admin_settings": "Admin-innstillinger",
+  "com_ui_admin_settings_section": "Admininnstillinger - {{section}}",
   "com_ui_advanced": "Avansert",
   "com_ui_advanced_settings": "Avanserte innstillinger",
   "com_ui_agent": "Agent",
+  "com_ui_agent_api_keys": "Agent API-nøkler",
+  "com_ui_agent_api_keys_description": "Lag API-nøkler for å få tilgang til agenter via API",
   "com_ui_agent_category_aftersales": "Ettersalg",
   "com_ui_agent_category_finance": "Finans",
   "com_ui_agent_category_general": "Generelt",
@@ -631,6 +677,17 @@
   "com_ui_agent_deleted": "Agenten ble slettet.",
   "com_ui_agent_duplicate_error": "Det oppstod en feil under duplisering av agenten.",
   "com_ui_agent_duplicated": "Agenten ble duplisert.",
+  "com_ui_agent_handoff_add": "Legg til overleveringsagent",
+  "com_ui_agent_handoff_description": "Beskrivelse av overlevering",
+  "com_ui_agent_handoff_description_placeholder": "f.eks., Overfør til dataanalytiker for statistisk analyse",
+  "com_ui_agent_handoff_info": "Konfigurer agenter som denne agenten kan overføre samtaler til når spesifikk ekspertise er nødvendig",
+  "com_ui_agent_handoff_info_2": "Hver overlevering lager et overføringsverktøy som tillater sømløs ruting til spesialistagenter med kontekst.",
+  "com_ui_agent_handoff_max": "Maksgrensen på {{0}} overleveringsagenter er nådd",
+  "com_ui_agent_handoff_prompt": "Gjennomføringsinnhold",
+  "com_ui_agent_handoff_prompt_key": "Innholdsparameter navn (standard: \"instruksjoner\")",
+  "com_ui_agent_handoff_prompt_key_placeholder": "Merk innholdet som er sendt (standard: \"instruksjoner\")",
+  "com_ui_agent_handoff_prompt_placeholder": "Fortell denne agenten hvilket innhold den skal generere og videreføre til overleveringsagenten. Du må legge til noe her for å skru på denne funksjonen.",
+  "com_ui_agent_handoffs": "Agentoverleveringer",
   "com_ui_agent_name_is_required": "Agentnavn er påkrevd.",
   "com_ui_agent_recursion_limit": "Maks agentsteg",
   "com_ui_agent_recursion_limit_info": "Begrenser hvor mange steg agenten kan ta i en kjøring før den gir et endelig svar. Standard er 25 steg. Et steg er enten en API-forespørsel eller bruk av et verktøy.",
@@ -652,12 +709,23 @@
   "com_ui_agents": "Agenter",
   "com_ui_agents_allow_create": "Tillat oppretting av agenter",
   "com_ui_agents_allow_share": "Tillat deling av agenter",
+  "com_ui_agents_allow_share_public": "Tillat offentlig deling av agenter",
   "com_ui_agents_allow_use": "Tillat bruk av agenter",
   "com_ui_all": "alle",
   "com_ui_all_proper": "Alle",
   "com_ui_analyzing": "Analyserer",
   "com_ui_analyzing_finished": "Ferdig med å analysere",
   "com_ui_api_key": "API-nøkkel",
+  "com_ui_api_key_copied": "API-nøkler kopiert til utklippstavlen",
+  "com_ui_api_key_create_error": "Kunne ikke lage API-nøkkel",
+  "com_ui_api_key_created": "Oppretting av API-nøkkel vellykket",
+  "com_ui_api_key_delete_error": "Kunne ikke slette API-nøkkel",
+  "com_ui_api_key_deleted": "Sletting av API-nøkkel vellykket",
+  "com_ui_api_key_name": "Navn på nøkkel",
+  "com_ui_api_key_name_placeholder": "Min API-nøkkel",
+  "com_ui_api_key_name_required": "Navn på API-nøkkel påkrevd",
+  "com_ui_api_key_warning": "Husk å kopiere API-nøkkelen din nå, du vil ikke kunne se den igjen!",
+  "com_ui_api_keys_load_error": "Kunne ikke laste inn API-nøkler",
   "com_ui_archive": "Arkiver",
   "com_ui_archive_delete_error": "Sletting av arkivert samtale mislyktes.",
   "com_ui_archive_error": "Arkivering av samtale mislyktes.",
@@ -674,6 +742,7 @@
   "com_ui_assistants_output": "Assistent-utdata",
   "com_ui_at_least_one_owner_required": "Minst én eier er påkrevd.",
   "com_ui_attach_error": "Kan ikke legge ved fil. Opprett eller velg en samtale, eller prøv å laste siden på nytt.",
+  "com_ui_attach_error_disabled": "FIlopplasting er deaktivert for dette endepunktet",
   "com_ui_attach_error_openai": "Kan ikke legge ved assistentfiler til andre endepunkter.",
   "com_ui_attach_error_size": "Filstørrelsesgrensen er overskredet for endepunktet:",
   "com_ui_attach_error_type": "Filtypen støttes ikke for endepunktet:",
@@ -690,6 +759,7 @@
   "com_ui_azure": "Azure",
   "com_ui_azure_ad": "Entra ID",
   "com_ui_back": "Tilbake",
+  "com_ui_back_to_builder": "Tilbake til bygger",
   "com_ui_back_to_chat": "Tilbake til samtale",
   "com_ui_back_to_prompts": "Tilbake til prompter",
   "com_ui_backup_code_number": "Kode #{{number}}",
@@ -701,10 +771,12 @@
   "com_ui_basic": "Grunnleggende",
   "com_ui_basic_auth_header": "Grunnleggende autorisasjonshode",
   "com_ui_bearer": "Bearer",
+  "com_ui_beta": "Beta",
   "com_ui_bookmark_delete_confirm": "Er du sikker på at du vil slette dette bokmerket?",
   "com_ui_bookmarks": "Bokmerker",
   "com_ui_bookmarks_add": "Legg til bokmerker",
   "com_ui_bookmarks_add_to_conversation": "Legg til i gjeldende samtale",
+  "com_ui_bookmarks_count_selected": "Bokmerker, {{count}} valgt",
   "com_ui_bookmarks_create_error": "Det oppstod en feil under oppretting av bokmerket.",
   "com_ui_bookmarks_create_exists": "Dette bokmerket finnes allerede.",
   "com_ui_bookmarks_create_success": "Bokmerket ble opprettet.",
@@ -719,52 +791,88 @@
   "com_ui_bookmarks_title": "Tittel",
   "com_ui_bookmarks_update_error": "Det oppstod en feil under oppdatering av bokmerket.",
   "com_ui_bookmarks_update_success": "Bokmerket ble oppdatert.",
+  "com_ui_branch_created": "Oppretting av gren vellykket",
+  "com_ui_branch_error": "Kunne ikke opprette gren",
+  "com_ui_branch_message": "Lag en gren fra denne responsen",
+  "com_ui_by_author": "av {{0}}",
   "com_ui_callback_url": "Tilbakekallings-URL",
   "com_ui_cancel": "Avbryt",
   "com_ui_cancelled": "Avbrutt",
   "com_ui_category": "Kategori",
+  "com_ui_change_version": "Endre versjon",
   "com_ui_chat": "Samtale",
   "com_ui_chat_history": "Samtalehistorikk",
+  "com_ui_chats": "Samtaler",
+  "com_ui_check_internet": "Sjekk din internettforbindelse",
   "com_ui_clear": "Fjern",
   "com_ui_clear_all": "Fjern alle",
+  "com_ui_clear_browser_cache": "Tøm nettleserbufferen",
+  "com_ui_clear_presets": "Tøm forhåndsinnstillinger",
+  "com_ui_clear_search": "Tøm søk",
+  "com_ui_click_to_close": "Klikk her for å lukke",
+  "com_ui_click_to_view_var": "Klikk her for å se {{0}}",
   "com_ui_client_id": "Klient-ID",
   "com_ui_client_secret": "Klienthemmelighet",
   "com_ui_close": "Lukk",
   "com_ui_close_menu": "Lukk meny",
+  "com_ui_close_settings": "Lukk innstillinger",
+  "com_ui_close_var": "Lukk {{0}}",
   "com_ui_close_window": "Lukk vindu",
   "com_ui_code": "Kode",
+  "com_ui_collapse": "Skjul",
   "com_ui_collapse_chat": "Skjul samtale",
+  "com_ui_collapse_thoughts": "Skjul tanker",
   "com_ui_command_placeholder": "Valgfritt: Skriv inn en kommando for prompten, ellers vil navnet bli brukt.",
   "com_ui_command_usage_placeholder": "Velg en prompt med kommando eller navn.",
   "com_ui_complete_setup": "Fullfør oppsett",
   "com_ui_concise": "Kortfattet",
+  "com_ui_configure": "Konfigurer",
   "com_ui_configure_mcp_variables_for": "Konfigurer variabler for {{0}}",
   "com_ui_confirm": "Bekreft",
   "com_ui_confirm_action": "Bekreft handling",
   "com_ui_confirm_admin_use_change": "Endring av denne innstillingen vil blokkere tilgang for administratorer, inkludert deg selv. Er du sikker på at du vil fortsette?",
   "com_ui_confirm_change": "Bekreft endring",
   "com_ui_connecting": "Kobler til",
+  "com_ui_contact_admin_if_issue_persists": "Kontakt en adiministrator dersom problemet vedvarer",
   "com_ui_context": "Kontekst",
+  "com_ui_context_filter_sort": "Filtrer og sortér etter kontekst",
   "com_ui_continue": "Fortsett",
   "com_ui_continue_oauth": "Fortsett med OAuth",
+  "com_ui_control_bar": "Kontroller bar",
   "com_ui_controls": "Kontroller",
+  "com_ui_conversation": "samtale",
+  "com_ui_conversation_label": "{{tittel}} samtale",
+  "com_ui_conversations": "samtaler",
+  "com_ui_convo_archived": "Samtale arkivert",
   "com_ui_convo_delete_error": "Sletting av samtale mislyktes.",
+  "com_ui_convo_delete_success": "Sletting av samtale vellykket",
   "com_ui_copied": "Kopiert!",
   "com_ui_copied_to_clipboard": "Kopiert til utklippstavlen",
+  "com_ui_copy": "Kopier",
   "com_ui_copy_code": "Kopier kode",
   "com_ui_copy_link": "Kopier lenke",
+  "com_ui_copy_stack_trace": "Kopier stack trace",
+  "com_ui_copy_thoughts_to_clipboard": "Kopier tanker til utklippstavle",
   "com_ui_copy_to_clipboard": "Kopier til utklippstavlen",
   "com_ui_copy_url_to_clipboard": "Kopier URL til utklippstavlen",
   "com_ui_create": "Opprett",
+  "com_ui_create_api_key": "Opprett API-nøkkel",
+  "com_ui_create_assistant": "Lag assistent",
   "com_ui_create_link": "Opprett lenke",
+  "com_ui_create_mcp_server": "Lag MCP-server",
   "com_ui_create_memory": "Opprett minne",
+  "com_ui_create_new_agent": "L",
   "com_ui_create_prompt": "Opprett prompt",
+  "com_ui_create_prompt_page": "ag ",
+  "com_ui_created": "Opprettet",
+  "com_ui_creating": "Oppretter...",
   "com_ui_creating_image": "Oppretter bilde. Dette kan ta et øyeblikk.",
   "com_ui_current": "Gjeldende",
   "com_ui_currently_production": "For øyeblikket i produksjon",
   "com_ui_custom": "Egendefinert",
   "com_ui_custom_header_name": "Egendefinert overskriftsnavn",
   "com_ui_custom_prompt_mode": "Egendefinert prompt-modus",
+  "com_ui_dark_theme_enabled": "Mørkt tema aktivert",
   "com_ui_dashboard": "Oversikt",
   "com_ui_date": "Dato",
   "com_ui_date_april": "April",
@@ -781,6 +889,7 @@
   "com_ui_date_previous_30_days": "Siste 30 dager",
   "com_ui_date_previous_7_days": "Siste 7 dager",
   "com_ui_date_september": "September",
+  "com_ui_date_sort": "Sorter etter dato",
   "com_ui_date_today": "I dag",
   "com_ui_date_yesterday": "I går",
   "com_ui_decline": "Jeg godtar ikke",
@@ -788,19 +897,30 @@
   "com_ui_delete": "Slett",
   "com_ui_delete_action": "Slett handling",
   "com_ui_delete_action_confirm": "Er du sikker på at du vil slette denne handlingen?",
+  "com_ui_delete_agent": "Slett agent",
   "com_ui_delete_agent_confirm": "Er du sikker på at du vil slette denne agenten?",
+  "com_ui_delete_assistant": "Slett assistent",
   "com_ui_delete_assistant_confirm": "Er du sikker på at du vil slette denne assistenten? Dette kan ikke angres.",
   "com_ui_delete_confirm": "Dette vil slette",
   "com_ui_delete_confirm_prompt_version_var": "Dette vil slette den valgte versjonen for \"{{0}}\". Hvis ingen andre versjoner eksisterer, vil prompten bli slettet.",
+  "com_ui_delete_confirm_strong": "Dette vil slette <strong>{{title}}</strong>",
   "com_ui_delete_conversation": "Slette samtalen?",
+  "com_ui_delete_conversation_tooltip": "Slett samtale",
+  "com_ui_delete_mcp_server": "Ønsker du å slette MCP-serveren?",
+  "com_ui_delete_mcp_server_name": "Slett MCP-server {{0}}",
   "com_ui_delete_memory": "Slett minne",
   "com_ui_delete_not_allowed": "Sletteoperasjon er ikke tillatt.",
+  "com_ui_delete_preset": "Ønsker du å slette forhåndsinnstillingen",
   "com_ui_delete_prompt": "Slette prompten?",
+  "com_ui_delete_prompt_name": "Slett prompt - {{name}}",
   "com_ui_delete_shared_link": "Slette delt lenke?",
+  "com_ui_delete_shared_link_heading": "Slett delt lenke",
   "com_ui_delete_success": "Vellykket slettet",
   "com_ui_delete_tool": "Slett verktøy",
   "com_ui_delete_tool_confirm": "Er du sikker på at du vil slette dette verktøyet?",
+  "com_ui_delete_tool_save_reminder": "Verktøy fjernet. Lagre agenten for å ta i bruk endreinger.",
   "com_ui_deleted": "Slettet",
+  "com_ui_deleting": "Sletter...",
   "com_ui_deleting_file": "Sletter fil ...",
   "com_ui_descending": "Synkende",
   "com_ui_description": "Beskrivelse",
@@ -808,37 +928,52 @@
   "com_ui_deselect_all": "Fravelg alle",
   "com_ui_detailed": "Detaljert",
   "com_ui_disabling": "Deaktiverer ...",
+  "com_ui_done": "Ferdig",
   "com_ui_download": "Last ned",
   "com_ui_download_artifact": "Last ned artefakt",
   "com_ui_download_backup": "Last ned reservekoder",
   "com_ui_download_backup_tooltip": "Før du fortsetter, last ned reservekodene dine. Du vil trenge dem for å få tilgang igjen hvis du mister autentiseringsenheten din.",
   "com_ui_download_error": "Feil ved nedlasting av fil. Filen kan ha blitt slettet.",
-  "com_ui_drag_drop": "Dra og slipp filer her, eller klikk for å velge.",
+  "com_ui_download_error_logs": "Last ned feillogger",
+  "com_ui_drag_drop": "Dra og slipp fil(er) her, eller klikk for å velge.",
   "com_ui_dropdown_variables": "Nedtrekksvariabler:",
   "com_ui_dropdown_variables_info": "Opprett egendefinerte nedtrekksmenyer for promptene dine: `{{variabelnavn:valg1|valg2|valg3}}`",
   "com_ui_duplicate": "Dupliser",
+  "com_ui_duplicate_agent": "Dupliser Agent",
   "com_ui_duplication_error": "Det oppstod en feil under duplisering av samtalen.",
   "com_ui_duplication_processing": "Dupliserer samtale ...",
   "com_ui_duplication_success": "Samtalen ble duplisert.",
   "com_ui_edit": "Rediger",
   "com_ui_edit_editing_image": "Redigerer bilde",
   "com_ui_edit_mcp_server": "Rediger MCP-server",
+  "com_ui_edit_mcp_server_dialog_description": "Unik Serveridentifikator: {{serverName}}",
   "com_ui_edit_memory": "Rediger minne",
+  "com_ui_edit_preset_title": "Rediger forhåndsinnstilling - {{title}}",
+  "com_ui_edit_prompt_page": "Rediger promptside",
+  "com_ui_editable_message": "Redigerbar melding",
+  "com_ui_editor_instructions": "Dra bildet for å flytte • Bruk zoom slider eller knapper for å justere størrelse",
   "com_ui_empty_category": "-",
   "com_ui_endpoint": "Endepunkt",
   "com_ui_endpoint_menu": "LLM-endepunktmeny",
   "com_ui_enter": "Enter",
   "com_ui_enter_api_key": "Skriv inn API-nøkkel",
+  "com_ui_enter_description": "Angi beskrivelse (valgfritt)",
   "com_ui_enter_key": "Skriv inn nøkkel",
+  "com_ui_enter_name": "Angi navn",
   "com_ui_enter_openapi_schema": "Skriv inn ditt OpenAPI-skjema her.",
   "com_ui_enter_value": "Skriv inn verdi",
   "com_ui_error": "Feil",
   "com_ui_error_connection": "Feil ved tilkobling til serveren, prøv å laste siden på nytt.",
+  "com_ui_error_message_prefix": "Feilmelding:",
   "com_ui_error_save_admin_settings": "Det oppstod en feil under lagring av admin-innstillingene.",
+  "com_ui_error_try_following_prefix": "Vennligst prøv en av de følgende",
+  "com_ui_error_unexpected": "Oops! Noe uforventet skjedde",
   "com_ui_error_updating_preferences": "Feil ved oppdatering av preferanser.",
   "com_ui_everyone_permission_level": "Alles tillatelsesnivå",
   "com_ui_examples": "Eksempler",
+  "com_ui_expand": "Utvid",
   "com_ui_expand_chat": "Utvid samtale",
+  "com_ui_expand_thoughts": "Utvidede tanker",
   "com_ui_export_convo_modal": "Eksporter samtale-modal",
   "com_ui_feedback_more": "Mer ...",
   "com_ui_feedback_more_information": "Gi ytterligere tilbakemelding",
@@ -858,10 +993,12 @@
   "com_ui_feedback_tag_unjustified_refusal": "Nektet uten grunn",
   "com_ui_field_max_length": "{{field}} må inneholde mindre enn {{length}} tegn",
   "com_ui_field_required": "Dette feltet er påkrevd.",
+  "com_ui_file_input_avatar_label": "Filinput for avatar",
   "com_ui_file_size": "Filstørrelse",
   "com_ui_file_token_limit": "Tokengrense for filer",
   "com_ui_file_token_limit_desc": "Angir maksimalt antall tokens som kan benyttes for filhåndtering. En høyere grense kan øke behandlingstid og kostnader.",
   "com_ui_files": "Filer",
+  "com_ui_filter_mcp_servers": "Filtrer MCP-servere etter navn",
   "com_ui_filter_prompts": "Filtrer prompter",
   "com_ui_filter_prompts_name": "Filtrer prompter etter navn",
   "com_ui_final_touch": "Siste finpuss",
@@ -885,6 +1022,7 @@
   "com_ui_fork_info_visible": "Dette alternativet forgrener kun de synlige meldingene, altså den direkte stien til målmeldingen, uten noen grener.",
   "com_ui_fork_more_details_about": "Se tilleggsinformasjon om forgrening-alternativet «{{0}}»",
   "com_ui_fork_more_info_options": "Se detaljert forklaring av alle forgrening-alternativer.",
+  "com_ui_fork_open_menu": "Åpne forgreningsmeny",
   "com_ui_fork_processing": "Forgrener samtale ...",
   "com_ui_fork_remember": "Husk",
   "com_ui_fork_remember_checked": "Ditt valg vil bli husket. Endre dette når som helst i innstillingene.",
@@ -903,7 +1041,11 @@
   "com_ui_good_evening": "God kveld",
   "com_ui_good_morning": "God morgen",
   "com_ui_group": "Gruppe",
+  "com_ui_handoff_instructions": "Overleveringsinstruksjoner",
   "com_ui_happy_birthday": "Det er min første bursdag!",
+  "com_ui_header_format": "Overskriftsformat",
+  "com_ui_hide": "Skjul",
+  "com_ui_hide_code": "Skjul kode",
   "com_ui_hide_image_details": "Skjul bildedetaljer",
   "com_ui_hide_password": "Skjul passord",
   "com_ui_hide_qr": "Skjul QR-kode",
@@ -920,18 +1062,26 @@
   "com_ui_import_conversation_file_type_error": "Importtypen støttes ikke.",
   "com_ui_import_conversation_info": "Importer samtaler fra en JSON-fil.",
   "com_ui_import_conversation_success": "Samtalene ble importert.",
+  "com_ui_import_conversation_upload_error": "Feil under opplasting av fil. Vennligst prøv igjen.",
+  "com_ui_importing": "Importerer",
   "com_ui_include_shadcnui": "Inkluder instruksjoner for shadcn/ui-komponenter",
   "com_ui_initializing": "Initialiserer...",
   "com_ui_input": "Inndata",
   "com_ui_instructions": "Instruksjoner",
   "com_ui_key": "Nøkkel",
+  "com_ui_key_required": "API-nøkkel påkrevd",
+  "com_ui_last_used": "Sist brukt",
   "com_ui_late_night": "God senkveld",
   "com_ui_latest_footer": "Én KI for alle.",
   "com_ui_latest_production_version": "Siste produksjonsversjon",
   "com_ui_latest_version": "Siste versjon",
+  "com_ui_leave_blank_to_keep": "La stå tomt for å beholde eksisterende",
   "com_ui_librechat_code_api_key": "Få din LibreChat Kodetolk API-nøkkel",
   "com_ui_librechat_code_api_subtitle": "Sikker. Flerspråklig. Fil-input/output.",
   "com_ui_librechat_code_api_title": "Kjør KI-kode",
+  "com_ui_light_theme_enabled": "Lyst tema aktivert",
+  "com_ui_link_copied": "Lenke kopiert",
+  "com_ui_link_refreshed": "Lenken er oppdatert",
   "com_ui_loading": "Laster ...",
   "com_ui_locked": "Låst",
   "com_ui_logo": "{{0}}-logo",
@@ -939,8 +1089,12 @@
   "com_ui_manage": "Administrer",
   "com_ui_marketplace": "Markedsplass",
   "com_ui_marketplace_allow_use": "Tillat bruk av markedsplass",
+  "com_ui_max": "Maks",
+  "com_ui_max_favorites_reached": "Maksimalt antall festede gjenstander nådd ({{0}}). Fjern noen gjenstander for å legge til flere.",
+  "com_ui_max_file_size": "PNG, JPG eller JPEG (maks {{0}})",
   "com_ui_max_tags": "Maksimalt antall er {{0}}. Bruker siste verdier.",
   "com_ui_mcp_authenticated_success": "MCP-serveren '{{0}}' ble autentisert.",
+  "com_ui_mcp_click_to_defer": "Klikk for å utsette – verktøyet vil være synlig via søk, men ikke lastet inn før det trengs",
   "com_ui_mcp_configure_server": "Konfigurer {{0}}",
   "com_ui_mcp_configure_server_description": "Konfigurer egendefinerte variabler for {{0}}",
   "com_ui_mcp_enter_var": "Skriv inn verdi for {{0}}",
diff --git a/client/src/locales/nn/translation.json b/client/src/locales/nn/translation.json
new file mode 100644
index 0000000000..0967ef424b
--- /dev/null
+++ b/client/src/locales/nn/translation.json
@@ -0,0 +1 @@
+{}
diff --git a/client/src/locales/sk/translation.json b/client/src/locales/sk/translation.json
new file mode 100644
index 0000000000..0967ef424b
--- /dev/null
+++ b/client/src/locales/sk/translation.json
@@ -0,0 +1 @@
+{}
diff --git a/client/src/mobile.css b/client/src/mobile.css
index ce9afee971..20eeb5d1da 100644
--- a/client/src/mobile.css
+++ b/client/src/mobile.css
@@ -9,7 +9,7 @@
 
 .nav {
   position: fixed;
-  z-index: 64;
+  z-index: 110;
   top: 0;
 
   /* max-width: 260px; */
@@ -36,7 +36,7 @@
   }
   .nav-mask {
     position: fixed;
-    z-index: 63;
+    z-index: 105;
     left: 0;
     right: 0;
     top: 0;
@@ -153,7 +153,7 @@
     right: 0;
     top: 0;
     bottom: 0;
-    background-color: rgba(86, 88, 105, 0.75);
+    background-color: rgba(7, 7, 7, 0.4);
     padding-left: 420px;
     padding-top: 12px;
     opacity: 0;
diff --git a/client/src/routes/Search.tsx b/client/src/routes/Search.tsx
index a9f210832c..b4db28c651 100644
--- a/client/src/routes/Search.tsx
+++ b/client/src/routes/Search.tsx
@@ -64,6 +64,17 @@ export default function Search() {
     }
   }, [isError, searchQuery, showToast]);
 
+  const resultsCount = messages?.length ?? 0;
+  const resultsAnnouncement = useMemo(() => {
+    if (resultsCount === 0) {
+      return localize('com_ui_nothing_found');
+    }
+    if (resultsCount === 1) {
+      return localize('com_ui_result_found', { count: resultsCount });
+    }
+    return localize('com_ui_results_found', { count: resultsCount });
+  }, [resultsCount, localize]);
+
   const isSearchLoading = search.isTyping || isLoading || isFetchingNextPage;
 
   if (isSearchLoading) {
@@ -80,6 +91,9 @@ export default function Search() {
 
   return (
     <MinimalMessagesWrapper ref={containerRef} className="relative flex h-full pt-4">
+      <div className="sr-only" role="alert" aria-atomic="true">
+        {resultsAnnouncement}
+      </div>
       {(messages && messages.length === 0) || messages == null ? (
         <div className="absolute inset-0 flex items-center justify-center">
           <div className="rounded-lg bg-white p-6 text-lg text-gray-500 dark:border-gray-800/50 dark:bg-gray-800 dark:text-gray-300">
diff --git a/client/src/store/favorites.ts b/client/src/store/favorites.ts
index b3744f52b0..9065f1ca4e 100644
--- a/client/src/store/favorites.ts
+++ b/client/src/store/favorites.ts
@@ -1,4 +1,4 @@
-import { createStorageAtom } from './jotai-utils';
+import { createTabIsolatedAtom } from './jotai-utils';
 
 export type Favorite = {
   agentId?: string;
@@ -16,4 +16,4 @@ export type FavoritesState = Favorite[];
 /**
  * This atom stores the user's favorite models/agents
  */
-export const favoritesAtom = createStorageAtom<FavoritesState>('favorites', []);
+export const favoritesAtom = createTabIsolatedAtom<FavoritesState>('favorites', []);
diff --git a/client/src/store/jotai-utils.ts b/client/src/store/jotai-utils.ts
index d3ca9d817c..5d2769d7e9 100644
--- a/client/src/store/jotai-utils.ts
+++ b/client/src/store/jotai-utils.ts
@@ -1,5 +1,6 @@
 import { atom } from 'jotai';
 import { atomWithStorage } from 'jotai/utils';
+import type { SyncStorage } from 'jotai/vanilla/utils/atomWithStorage';
 
 /**
  * Create a simple atom with localStorage persistence
@@ -42,6 +43,68 @@ export function createStorageAtomWithEffect<T>(
   );
 }
 
+/**
+ * Create a SyncStorage adapter that reads/writes to localStorage but does NOT
+ * subscribe to browser `storage` events. This prevents cross-tab synchronization
+ * for atoms where each tab should maintain independent state.
+ *
+ * Use this for atoms that represent per-tab working state (e.g., favorites toggle,
+ * MCP server selections) rather than user preferences.
+ */
+export function createTabIsolatedStorage<Value>(): SyncStorage<Value> {
+  return {
+    getItem(key: string, initialValue: Value): Value {
+      if (typeof window === 'undefined') {
+        return initialValue;
+      }
+      try {
+        const stored = localStorage.getItem(key);
+        if (stored === null) {
+          return initialValue;
+        }
+        return JSON.parse(stored) as Value;
+      } catch {
+        return initialValue;
+      }
+    },
+    setItem(key: string, newValue: Value): void {
+      if (typeof window === 'undefined') {
+        return;
+      }
+      try {
+        localStorage.setItem(key, JSON.stringify(newValue));
+      } catch {
+        // quota exceeded or other write error — silently ignore
+      }
+    },
+    removeItem(key: string): void {
+      if (typeof window === 'undefined') {
+        return;
+      }
+      try {
+        localStorage.removeItem(key);
+      } catch {
+        // silently ignore
+      }
+    },
+    // subscribe intentionally omitted — prevents cross-tab sync via storage events
+  };
+}
+
+/**
+ * Create an atom with localStorage persistence that does NOT sync across tabs.
+ * Parallels `createStorageAtom` but uses tab-isolated storage.
+ *
+ * @param key - localStorage key
+ * @param defaultValue - default value if no saved value exists
+ * @returns Jotai atom with localStorage persistence, isolated per tab
+ */
+export function createTabIsolatedAtom<T>(key: string, defaultValue: T) {
+  return atomWithStorage<T>(key, defaultValue, createTabIsolatedStorage<T>(), {
+    getOnInit: true,
+  });
+}
+
 /**
  * Initialize a value from localStorage and optionally apply it
  * Useful for applying saved values on app startup (e.g., theme, fontSize)
diff --git a/client/src/store/mcp.ts b/client/src/store/mcp.ts
index e540b167e4..793e1cebd0 100644
--- a/client/src/store/mcp.ts
+++ b/client/src/store/mcp.ts
@@ -1,6 +1,14 @@
 import { atom } from 'jotai';
 import { atomFamily, atomWithStorage } from 'jotai/utils';
 import { Constants, LocalStorageKeys } from 'librechat-data-provider';
+import { createTabIsolatedStorage } from './jotai-utils';
+
+/**
+ * Tab-isolated storage for MCP values — prevents cross-tab sync so that
+ * each tab's MCP server selections are independent (especially for new chats
+ * which all share the same `LAST_MCP_new` localStorage key).
+ */
+const mcpTabIsolatedStorage = createTabIsolatedStorage<string[]>();
 
 /**
  * Creates a storage atom for MCP values per conversation
@@ -10,7 +18,7 @@ export const mcpValuesAtomFamily = atomFamily((conversationId: string | null) =>
   const key = conversationId ?? Constants.NEW_CONVO;
   const storageKey = `${LocalStorageKeys.LAST_MCP_}${key}`;
 
-  return atomWithStorage<string[]>(storageKey, [], undefined, { getOnInit: true });
+  return atomWithStorage<string[]>(storageKey, [], mcpTabIsolatedStorage, { getOnInit: true });
 });
 
 /**
diff --git a/client/src/style.css b/client/src/style.css
index c41d3679f7..cf3ea50294 100644
--- a/client/src/style.css
+++ b/client/src/style.css
@@ -70,6 +70,7 @@ html {
   --text-secondary-alt: var(--gray-500);
   --text-tertiary: var(--gray-500);
   --text-warning: var(--amber-500);
+  --text-destructive: var(--red-600);
   --ring-primary: var(--gray-500);
   --header-primary: var(--white);
   --header-hover: var(--gray-50);
@@ -96,6 +97,7 @@ html {
   --border-medium: var(--gray-300);
   --border-heavy: var(--gray-400);
   --border-xheavy: var(--gray-500);
+  --border-destructive: var(--red-600);
   /* These are test styles */
 
   --background: 0 0% 100%;
@@ -131,6 +133,7 @@ html {
   --text-secondary-alt: var(--gray-400);
   --text-tertiary: var(--gray-500);
   --text-warning: var(--amber-500);
+  --text-destructive: var(--red-600);
   --header-primary: var(--gray-700);
   --header-hover: var(--gray-600);
   --header-button-hover: var(--gray-700);
@@ -156,6 +159,7 @@ html {
   --border-medium: var(--gray-600);
   --border-heavy: var(--gray-500);
   --border-xheavy: var(--gray-400);
+  --border-destructive: var(--red-500);
   /* These are test styles */
 
   --background: 0 0% 7%;
@@ -2668,6 +2672,10 @@ html {
   color: var(--text-primary);
 }
 
+.account-settings-popover .select-item[data-active-item] {
+  box-shadow: 0 0 0 2px hsl(var(--ring));
+}
+
 .popover-ui[data-enter] {
   opacity: 1;
   scale: 1;
diff --git a/client/src/utils/__tests__/applyModelSpecEphemeralAgent.test.ts b/client/src/utils/__tests__/applyModelSpecEphemeralAgent.test.ts
new file mode 100644
index 0000000000..44bfbb82f7
--- /dev/null
+++ b/client/src/utils/__tests__/applyModelSpecEphemeralAgent.test.ts
@@ -0,0 +1,274 @@
+import { Constants, LocalStorageKeys } from 'librechat-data-provider';
+import type { TModelSpec, TEphemeralAgent } from 'librechat-data-provider';
+import { applyModelSpecEphemeralAgent } from '../endpoints';
+import { setTimestamp } from '../timestamps';
+
+/**
+ * Tests for applyModelSpecEphemeralAgent — the function responsible for
+ * constructing the ephemeral agent state when navigating to a spec conversation.
+ *
+ * Desired behaviors:
+ * - New conversations always get the admin's exact spec configuration
+ * - Existing conversations merge per-conversation localStorage overrides on top of spec
+ * - Cleared localStorage for existing conversations falls back to fresh spec config
+ */
+
+const createModelSpec = (overrides: Partial<TModelSpec> = {}): TModelSpec =>
+  ({
+    name: 'test-spec',
+    label: 'Test Spec',
+    preset: { endpoint: 'agents' },
+    mcpServers: ['spec-server1'],
+    webSearch: true,
+    executeCode: true,
+    fileSearch: false,
+    artifacts: true,
+    ...overrides,
+  }) as TModelSpec;
+
+/** Write a value + fresh timestamp to localStorage (simulates a user toggle) */
+function writeToolToggle(storagePrefix: string, convoId: string, value: unknown): void {
+  const key = `${storagePrefix}${convoId}`;
+  localStorage.setItem(key, JSON.stringify(value));
+  setTimestamp(key);
+}
+
+describe('applyModelSpecEphemeralAgent', () => {
+  let updateEphemeralAgent: jest.Mock<void, [string, TEphemeralAgent | null]>;
+
+  beforeEach(() => {
+    localStorage.clear();
+    updateEphemeralAgent = jest.fn();
+  });
+
+  // ─── New Conversations ─────────────────────────────────────────────
+
+  describe('new conversations always get fresh admin spec config', () => {
+    it('should apply exactly the admin-configured tools and MCP servers', () => {
+      const modelSpec = createModelSpec({
+        mcpServers: ['clickhouse', 'github'],
+        executeCode: true,
+        webSearch: false,
+        fileSearch: true,
+        artifacts: true,
+      });
+
+      applyModelSpecEphemeralAgent({
+        convoId: null,
+        modelSpec,
+        updateEphemeralAgent,
+      });
+
+      expect(updateEphemeralAgent).toHaveBeenCalledWith(Constants.NEW_CONVO, {
+        mcp: ['clickhouse', 'github'],
+        execute_code: true,
+        web_search: false,
+        file_search: true,
+        artifacts: 'default',
+      });
+    });
+
+    it('should not read from localStorage even if stale values exist', () => {
+      // Simulate stale localStorage from a previous session
+      writeToolToggle(LocalStorageKeys.LAST_CODE_TOGGLE_, Constants.NEW_CONVO, false);
+      writeToolToggle(LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_, Constants.NEW_CONVO, true);
+      localStorage.setItem(
+        `${LocalStorageKeys.LAST_MCP_}${Constants.NEW_CONVO}`,
+        JSON.stringify(['stale-server']),
+      );
+
+      const modelSpec = createModelSpec({ executeCode: true, webSearch: false, mcpServers: [] });
+
+      applyModelSpecEphemeralAgent({
+        convoId: null,
+        modelSpec,
+        updateEphemeralAgent,
+      });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      // Should be spec values, NOT localStorage values
+      expect(agent.execute_code).toBe(true);
+      expect(agent.web_search).toBe(false);
+      expect(agent.mcp).toEqual([]);
+    });
+
+    it('should handle spec with no MCP servers', () => {
+      const modelSpec = createModelSpec({ mcpServers: undefined });
+
+      applyModelSpecEphemeralAgent({ convoId: null, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      expect(agent.mcp).toEqual([]);
+    });
+
+    it('should map artifacts: true to "default" string', () => {
+      const modelSpec = createModelSpec({ artifacts: true });
+
+      applyModelSpecEphemeralAgent({ convoId: null, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      expect(agent.artifacts).toBe('default');
+    });
+
+    it('should pass through artifacts string value directly', () => {
+      const modelSpec = createModelSpec({ artifacts: 'custom-renderer' as any });
+
+      applyModelSpecEphemeralAgent({ convoId: null, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      expect(agent.artifacts).toBe('custom-renderer');
+    });
+  });
+
+  // ─── Existing Conversations: Per-Conversation Persistence ──────────
+
+  describe('existing conversations merge user overrides from localStorage', () => {
+    const convoId = 'convo-abc-123';
+
+    it('should preserve user tool modifications across navigation', () => {
+      // User previously toggled off code execution and enabled file search
+      writeToolToggle(LocalStorageKeys.LAST_CODE_TOGGLE_, convoId, false);
+      writeToolToggle(LocalStorageKeys.LAST_FILE_SEARCH_TOGGLE_, convoId, true);
+
+      const modelSpec = createModelSpec({
+        executeCode: true,
+        fileSearch: false,
+        webSearch: true,
+      });
+
+      applyModelSpecEphemeralAgent({ convoId, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      expect(agent.execute_code).toBe(false); // user override
+      expect(agent.file_search).toBe(true); // user override
+      expect(agent.web_search).toBe(true); // not overridden, spec value
+    });
+
+    it('should preserve user-added MCP servers across navigation', () => {
+      // Spec has clickhouse, user also added github during the conversation
+      localStorage.setItem(
+        `${LocalStorageKeys.LAST_MCP_}${convoId}`,
+        JSON.stringify(['clickhouse', 'github']),
+      );
+
+      const modelSpec = createModelSpec({ mcpServers: ['clickhouse'] });
+
+      applyModelSpecEphemeralAgent({ convoId, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      expect(agent.mcp).toEqual(['clickhouse', 'github']);
+    });
+
+    it('should preserve user-removed MCP servers (empty array) across navigation', () => {
+      // User removed all MCP servers during the conversation
+      localStorage.setItem(`${LocalStorageKeys.LAST_MCP_}${convoId}`, JSON.stringify([]));
+
+      const modelSpec = createModelSpec({ mcpServers: ['clickhouse', 'github'] });
+
+      applyModelSpecEphemeralAgent({ convoId, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      expect(agent.mcp).toEqual([]);
+    });
+
+    it('should only override keys that exist in localStorage, leaving the rest as spec defaults', () => {
+      // User only changed artifacts, nothing else
+      writeToolToggle(LocalStorageKeys.LAST_ARTIFACTS_TOGGLE_, convoId, '');
+
+      const modelSpec = createModelSpec({
+        executeCode: true,
+        webSearch: true,
+        fileSearch: false,
+        artifacts: true,
+        mcpServers: ['server1'],
+      });
+
+      applyModelSpecEphemeralAgent({ convoId, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      expect(agent.execute_code).toBe(true); // spec default (not in localStorage)
+      expect(agent.web_search).toBe(true); // spec default
+      expect(agent.file_search).toBe(false); // spec default
+      expect(agent.artifacts).toBe(''); // user override
+      expect(agent.mcp).toEqual(['server1']); // spec default (not in localStorage)
+    });
+  });
+
+  // ─── Existing Conversations: Cleared localStorage ──────────────────
+
+  describe('existing conversations with cleared localStorage get fresh spec config', () => {
+    const convoId = 'convo-cleared-456';
+
+    it('should fall back to pure spec values when localStorage is empty', () => {
+      // localStorage.clear() was already called in beforeEach
+
+      const modelSpec = createModelSpec({
+        executeCode: true,
+        webSearch: false,
+        fileSearch: true,
+        artifacts: true,
+        mcpServers: ['server1', 'server2'],
+      });
+
+      applyModelSpecEphemeralAgent({ convoId, modelSpec, updateEphemeralAgent });
+
+      expect(updateEphemeralAgent).toHaveBeenCalledWith(convoId, {
+        mcp: ['server1', 'server2'],
+        execute_code: true,
+        web_search: false,
+        file_search: true,
+        artifacts: 'default',
+      });
+    });
+
+    it('should fall back to spec values when timestamps have expired (>2 days)', () => {
+      // Write values with expired timestamps (3 days old)
+      const expiredTimestamp = (Date.now() - 3 * 24 * 60 * 60 * 1000).toString();
+      const codeKey = `${LocalStorageKeys.LAST_CODE_TOGGLE_}${convoId}`;
+      localStorage.setItem(codeKey, JSON.stringify(false));
+      localStorage.setItem(`${codeKey}_TIMESTAMP`, expiredTimestamp);
+
+      const modelSpec = createModelSpec({ executeCode: true });
+
+      applyModelSpecEphemeralAgent({ convoId, modelSpec, updateEphemeralAgent });
+
+      const agent = updateEphemeralAgent.mock.calls[0][1] as TEphemeralAgent;
+      // Expired override should be ignored — spec value wins
+      expect(agent.execute_code).toBe(true);
+    });
+  });
+
+  // ─── Guard Clauses ─────────────────────────────────────────────────
+
+  describe('guard clauses', () => {
+    it('should not call updateEphemeralAgent when modelSpec is undefined', () => {
+      applyModelSpecEphemeralAgent({
+        convoId: 'convo-1',
+        modelSpec: undefined,
+        updateEphemeralAgent,
+      });
+
+      expect(updateEphemeralAgent).not.toHaveBeenCalled();
+    });
+
+    it('should not throw when updateEphemeralAgent is undefined', () => {
+      expect(() =>
+        applyModelSpecEphemeralAgent({
+          convoId: 'convo-1',
+          modelSpec: createModelSpec(),
+          updateEphemeralAgent: undefined,
+        }),
+      ).not.toThrow();
+    });
+
+    it('should use NEW_CONVO key when convoId is empty string', () => {
+      applyModelSpecEphemeralAgent({
+        convoId: '',
+        modelSpec: createModelSpec(),
+        updateEphemeralAgent,
+      });
+
+      expect(updateEphemeralAgent).toHaveBeenCalledWith(Constants.NEW_CONVO, expect.any(Object));
+    });
+  });
+});
diff --git a/client/src/utils/__tests__/buildDefaultConvo.test.ts b/client/src/utils/__tests__/buildDefaultConvo.test.ts
new file mode 100644
index 0000000000..00a4d6313b
--- /dev/null
+++ b/client/src/utils/__tests__/buildDefaultConvo.test.ts
@@ -0,0 +1,202 @@
+import { EModelEndpoint } from 'librechat-data-provider';
+import type { TConversation } from 'librechat-data-provider';
+import buildDefaultConvo from '../buildDefaultConvo';
+
+jest.mock('../localStorage', () => ({
+  getLocalStorageItems: jest.fn(() => ({
+    lastSelectedModel: {},
+    lastSelectedTools: [],
+    lastConversationSetup: {},
+  })),
+}));
+
+const baseConversation: TConversation = {
+  conversationId: 'test-convo-id',
+  title: 'Test Conversation',
+  createdAt: '2024-01-01T00:00:00Z',
+  updatedAt: '2024-01-01T00:00:00Z',
+  endpoint: null,
+};
+
+describe('buildDefaultConvo - defaultParamsEndpoint', () => {
+  describe('custom endpoint with defaultParamsEndpoint: anthropic', () => {
+    const models = ['anthropic/claude-opus-4.5', 'anthropic/claude-sonnet-4'];
+
+    it('should preserve maxOutputTokens from model spec preset', () => {
+      const preset: TConversation = {
+        ...baseConversation,
+        endpoint: 'AnthropicClaude' as EModelEndpoint,
+        endpointType: EModelEndpoint.custom,
+        model: 'anthropic/claude-opus-4.5',
+        temperature: 0.7,
+        maxOutputTokens: 8192,
+        topP: 0.9,
+        maxContextTokens: 50000,
+      };
+
+      const result = buildDefaultConvo({
+        models,
+        conversation: baseConversation,
+        endpoint: 'AnthropicClaude' as EModelEndpoint,
+        lastConversationSetup: preset,
+        defaultParamsEndpoint: EModelEndpoint.anthropic,
+      });
+
+      expect(result.maxOutputTokens).toBe(8192);
+      expect(result.topP).toBe(0.9);
+      expect(result.temperature).toBe(0.7);
+      expect(result.maxContextTokens).toBe(50000);
+      expect(result.model).toBe('anthropic/claude-opus-4.5');
+    });
+
+    it('should strip maxOutputTokens without defaultParamsEndpoint', () => {
+      const preset: TConversation = {
+        ...baseConversation,
+        endpoint: 'AnthropicClaude' as EModelEndpoint,
+        endpointType: EModelEndpoint.custom,
+        model: 'anthropic/claude-opus-4.5',
+        temperature: 0.7,
+        maxOutputTokens: 8192,
+      };
+
+      const result = buildDefaultConvo({
+        models,
+        conversation: baseConversation,
+        endpoint: 'AnthropicClaude' as EModelEndpoint,
+        lastConversationSetup: preset,
+      });
+
+      expect(result.maxOutputTokens).toBeUndefined();
+      expect(result.temperature).toBe(0.7);
+    });
+
+    it('should strip OpenAI-specific fields when using anthropic params', () => {
+      const preset: TConversation = {
+        ...baseConversation,
+        endpoint: 'AnthropicClaude' as EModelEndpoint,
+        endpointType: EModelEndpoint.custom,
+        model: 'anthropic/claude-opus-4.5',
+        max_tokens: 4096,
+        top_p: 0.9,
+        presence_penalty: 0.5,
+        frequency_penalty: 0.3,
+      };
+
+      const result = buildDefaultConvo({
+        models,
+        conversation: baseConversation,
+        endpoint: 'AnthropicClaude' as EModelEndpoint,
+        lastConversationSetup: preset,
+        defaultParamsEndpoint: EModelEndpoint.anthropic,
+      });
+
+      expect(result.max_tokens).toBeUndefined();
+      expect(result.top_p).toBeUndefined();
+      expect(result.presence_penalty).toBeUndefined();
+      expect(result.frequency_penalty).toBeUndefined();
+    });
+  });
+
+  describe('custom endpoint without defaultParamsEndpoint (OpenAI default)', () => {
+    const models = ['gpt-4o', 'gpt-4.1'];
+
+    it('should preserve OpenAI fields and strip anthropic fields', () => {
+      const preset: TConversation = {
+        ...baseConversation,
+        endpoint: 'MyOpenRouterEndpoint' as EModelEndpoint,
+        endpointType: EModelEndpoint.custom,
+        model: 'gpt-4o',
+        temperature: 0.7,
+        max_tokens: 4096,
+        top_p: 0.9,
+        maxOutputTokens: 8192,
+      };
+
+      const result = buildDefaultConvo({
+        models,
+        conversation: baseConversation,
+        endpoint: 'MyOpenRouterEndpoint' as EModelEndpoint,
+        lastConversationSetup: preset,
+      });
+
+      expect(result.max_tokens).toBe(4096);
+      expect(result.top_p).toBe(0.9);
+      expect(result.temperature).toBe(0.7);
+      expect(result.maxOutputTokens).toBeUndefined();
+    });
+  });
+
+  describe('custom endpoint with defaultParamsEndpoint: google', () => {
+    const models = ['gemini-pro', 'gemini-1.5-pro'];
+
+    it('should preserve Google-specific fields', () => {
+      const preset: TConversation = {
+        ...baseConversation,
+        endpoint: 'MyGoogleEndpoint' as EModelEndpoint,
+        endpointType: EModelEndpoint.custom,
+        model: 'gemini-pro',
+        temperature: 0.7,
+        maxOutputTokens: 8192,
+        topP: 0.9,
+        topK: 40,
+      };
+
+      const result = buildDefaultConvo({
+        models,
+        conversation: baseConversation,
+        endpoint: 'MyGoogleEndpoint' as EModelEndpoint,
+        lastConversationSetup: preset,
+        defaultParamsEndpoint: EModelEndpoint.google,
+      });
+
+      expect(result.maxOutputTokens).toBe(8192);
+      expect(result.topP).toBe(0.9);
+      expect(result.topK).toBe(40);
+    });
+  });
+
+  describe('cross-endpoint field isolation', () => {
+    it('should not carry bedrock region to a custom endpoint', () => {
+      const preset: TConversation = {
+        ...baseConversation,
+        endpoint: 'MyChatEndpoint' as EModelEndpoint,
+        endpointType: EModelEndpoint.custom,
+        model: 'gpt-4o',
+        temperature: 0.7,
+        region: 'us-east-1',
+      };
+
+      const result = buildDefaultConvo({
+        models: ['gpt-4o'],
+        conversation: baseConversation,
+        endpoint: 'MyChatEndpoint' as EModelEndpoint,
+        lastConversationSetup: preset,
+      });
+
+      expect(result.region).toBeUndefined();
+      expect(result.temperature).toBe(0.7);
+    });
+
+    it('should not carry bedrock region even with anthropic defaultParamsEndpoint', () => {
+      const preset: TConversation = {
+        ...baseConversation,
+        endpoint: 'MyChatEndpoint' as EModelEndpoint,
+        endpointType: EModelEndpoint.custom,
+        model: 'claude-3-opus',
+        region: 'us-east-1',
+        maxOutputTokens: 8192,
+      };
+
+      const result = buildDefaultConvo({
+        models: ['claude-3-opus'],
+        conversation: baseConversation,
+        endpoint: 'MyChatEndpoint' as EModelEndpoint,
+        lastConversationSetup: preset,
+        defaultParamsEndpoint: EModelEndpoint.anthropic,
+      });
+
+      expect(result.region).toBeUndefined();
+      expect(result.maxOutputTokens).toBe(8192);
+    });
+  });
+});
diff --git a/client/src/utils/__tests__/cleanupPreset.integration.test.ts b/client/src/utils/__tests__/cleanupPreset.integration.test.ts
new file mode 100644
index 0000000000..1e1219bc7a
--- /dev/null
+++ b/client/src/utils/__tests__/cleanupPreset.integration.test.ts
@@ -0,0 +1,119 @@
+import { EModelEndpoint } from 'librechat-data-provider';
+import cleanupPreset from '../cleanupPreset';
+
+/**
+ * Integration tests for cleanupPreset — NO mocks.
+ * Uses the real parseConvo to verify actual schema behavior
+ * with defaultParamsEndpoint for custom endpoints.
+ */
+describe('cleanupPreset - real parsing with defaultParamsEndpoint', () => {
+  it('should preserve maxOutputTokens when defaultParamsEndpoint is anthropic', () => {
+    const preset = {
+      presetId: 'test-id',
+      title: 'Claude Opus',
+      endpoint: 'AnthropicClaude',
+      endpointType: EModelEndpoint.custom,
+      model: 'anthropic/claude-opus-4.5',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+      topP: 0.9,
+      maxContextTokens: 50000,
+    };
+
+    const result = cleanupPreset({
+      preset,
+      defaultParamsEndpoint: EModelEndpoint.anthropic,
+    });
+
+    expect(result.maxOutputTokens).toBe(8192);
+    expect(result.topP).toBe(0.9);
+    expect(result.temperature).toBe(0.7);
+    expect(result.maxContextTokens).toBe(50000);
+    expect(result.model).toBe('anthropic/claude-opus-4.5');
+  });
+
+  it('should strip maxOutputTokens without defaultParamsEndpoint (OpenAI schema)', () => {
+    const preset = {
+      presetId: 'test-id',
+      title: 'GPT Custom',
+      endpoint: 'MyOpenRouter',
+      endpointType: EModelEndpoint.custom,
+      model: 'gpt-4o',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+      max_tokens: 4096,
+    };
+
+    const result = cleanupPreset({ preset });
+
+    expect(result.maxOutputTokens).toBeUndefined();
+    expect(result.max_tokens).toBe(4096);
+    expect(result.temperature).toBe(0.7);
+  });
+
+  it('should strip OpenAI-specific fields when using anthropic params', () => {
+    const preset = {
+      presetId: 'test-id',
+      title: 'Claude Custom',
+      endpoint: 'AnthropicClaude',
+      endpointType: EModelEndpoint.custom,
+      model: 'anthropic/claude-3-opus',
+      max_tokens: 4096,
+      top_p: 0.9,
+      presence_penalty: 0.5,
+      frequency_penalty: 0.3,
+      temperature: 0.7,
+    };
+
+    const result = cleanupPreset({
+      preset,
+      defaultParamsEndpoint: EModelEndpoint.anthropic,
+    });
+
+    expect(result.max_tokens).toBeUndefined();
+    expect(result.top_p).toBeUndefined();
+    expect(result.presence_penalty).toBeUndefined();
+    expect(result.frequency_penalty).toBeUndefined();
+    expect(result.temperature).toBe(0.7);
+  });
+
+  it('should not carry bedrock region to custom endpoint', () => {
+    const preset = {
+      presetId: 'test-id',
+      title: 'Custom',
+      endpoint: 'MyEndpoint',
+      endpointType: EModelEndpoint.custom,
+      model: 'gpt-4o',
+      temperature: 0.7,
+      region: 'us-east-1',
+    };
+
+    const result = cleanupPreset({ preset });
+
+    expect(result.region).toBeUndefined();
+    expect(result.temperature).toBe(0.7);
+  });
+
+  it('should preserve Google-specific fields when defaultParamsEndpoint is google', () => {
+    const preset = {
+      presetId: 'test-id',
+      title: 'Gemini Custom',
+      endpoint: 'MyGoogleEndpoint',
+      endpointType: EModelEndpoint.custom,
+      model: 'gemini-pro',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+      topP: 0.9,
+      topK: 40,
+    };
+
+    const result = cleanupPreset({
+      preset,
+      defaultParamsEndpoint: EModelEndpoint.google,
+    });
+
+    expect(result.maxOutputTokens).toBe(8192);
+    expect(result.topP).toBe(0.9);
+    expect(result.topK).toBe(40);
+  });
+});
diff --git a/client/src/utils/__tests__/cleanupPreset.test.ts b/client/src/utils/__tests__/cleanupPreset.test.ts
index a03477de15..766bb872ac 100644
--- a/client/src/utils/__tests__/cleanupPreset.test.ts
+++ b/client/src/utils/__tests__/cleanupPreset.test.ts
@@ -1,12 +1,9 @@
-import { EModelEndpoint } from 'librechat-data-provider';
+import { EModelEndpoint, parseConvo } from 'librechat-data-provider';
 import cleanupPreset from '../cleanupPreset';
-import type { TPreset } from 'librechat-data-provider';
-
 // Mock parseConvo since we're focusing on testing the chatGptLabel migration logic
 jest.mock('librechat-data-provider', () => ({
   ...jest.requireActual('librechat-data-provider'),
   parseConvo: jest.fn((input) => {
-    // Return a simplified mock that passes through most properties
     const { conversation } = input;
     return {
       ...conversation,
@@ -221,4 +218,41 @@ describe('cleanupPreset', () => {
       expect(result.presetId).toBeNull();
     });
   });
+
+  describe('defaultParamsEndpoint threading', () => {
+    it('should pass defaultParamsEndpoint to parseConvo', () => {
+      const preset = {
+        ...basePreset,
+        endpoint: 'MyCustomEndpoint',
+        endpointType: EModelEndpoint.custom,
+      };
+
+      cleanupPreset({
+        preset,
+        defaultParamsEndpoint: EModelEndpoint.anthropic,
+      });
+
+      expect(parseConvo).toHaveBeenCalledWith(
+        expect.objectContaining({
+          defaultParamsEndpoint: EModelEndpoint.anthropic,
+        }),
+      );
+    });
+
+    it('should pass undefined defaultParamsEndpoint when not provided', () => {
+      const preset = {
+        ...basePreset,
+        endpoint: 'MyCustomEndpoint',
+        endpointType: EModelEndpoint.custom,
+      };
+
+      cleanupPreset({ preset });
+
+      expect(parseConvo).toHaveBeenCalledWith(
+        expect.objectContaining({
+          defaultParamsEndpoint: undefined,
+        }),
+      );
+    });
+  });
 });
diff --git a/client/src/utils/buildDefaultConvo.ts b/client/src/utils/buildDefaultConvo.ts
index 025bec24eb..c2d2871912 100644
--- a/client/src/utils/buildDefaultConvo.ts
+++ b/client/src/utils/buildDefaultConvo.ts
@@ -14,11 +14,13 @@ const buildDefaultConvo = ({
   conversation,
   endpoint = null,
   lastConversationSetup,
+  defaultParamsEndpoint,
 }: {
   models: string[];
   conversation: TConversation;
   endpoint?: EModelEndpoint | null;
   lastConversationSetup: TConversation | null;
+  defaultParamsEndpoint?: string | null;
 }): TConversation => {
   const { lastSelectedModel, lastSelectedTools } = getLocalStorageItems();
   const endpointType = lastConversationSetup?.endpointType ?? conversation.endpointType;
@@ -49,6 +51,7 @@ const buildDefaultConvo = ({
     possibleValues: {
       models: possibleModels,
     },
+    defaultParamsEndpoint,
   });
 
   const defaultConvo = {
diff --git a/client/src/utils/cleanupPreset.ts b/client/src/utils/cleanupPreset.ts
index c158d935fa..ad44726064 100644
--- a/client/src/utils/cleanupPreset.ts
+++ b/client/src/utils/cleanupPreset.ts
@@ -4,9 +4,10 @@ import type { TPreset } from 'librechat-data-provider';
 type UIPreset = Partial<TPreset> & { presetOverride?: Partial<TPreset> };
 type TCleanupPreset = {
   preset?: UIPreset;
+  defaultParamsEndpoint?: string | null;
 };
 
-const cleanupPreset = ({ preset: _preset }: TCleanupPreset): TPreset => {
+const cleanupPreset = ({ preset: _preset, defaultParamsEndpoint }: TCleanupPreset): TPreset => {
   const { endpoint, endpointType } = _preset ?? ({} as UIPreset);
   if (endpoint == null || endpoint === '') {
     console.error(`Unknown endpoint ${endpoint}`, _preset);
@@ -35,8 +36,13 @@ const cleanupPreset = ({ preset: _preset }: TCleanupPreset): TPreset => {
     delete preset.chatGptLabel;
   }
 
-  /* @ts-ignore: endpoint can be a custom defined name */
-  const parsedPreset = parseConvo({ endpoint, endpointType, conversation: preset });
+  const parsedPreset = parseConvo({
+    /* @ts-ignore: endpoint can be a custom defined name */
+    endpoint,
+    endpointType,
+    conversation: preset,
+    defaultParamsEndpoint,
+  });
 
   return {
     presetId: _preset?.presetId ?? null,
diff --git a/client/src/utils/endpoints.ts b/client/src/utils/endpoints.ts
index eb9e60386f..33aa7a8525 100644
--- a/client/src/utils/endpoints.ts
+++ b/client/src/utils/endpoints.ts
@@ -11,6 +11,7 @@ import {
 } from 'librechat-data-provider';
 import type * as t from 'librechat-data-provider';
 import type { LocalizeFunction, IconsRecord } from '~/common';
+import { getTimestampedValue } from './timestamps';
 
 /**
  * Clears model for non-ephemeral agent conversations.
@@ -219,12 +220,51 @@ export function applyModelSpecEphemeralAgent({
   if (!modelSpec || !updateEphemeralAgent) {
     return;
   }
-  updateEphemeralAgent((convoId ?? Constants.NEW_CONVO) || Constants.NEW_CONVO, {
-    mcp: modelSpec.mcpServers ?? [Constants.mcp_clear as string],
+  const key = (convoId ?? Constants.NEW_CONVO) || Constants.NEW_CONVO;
+  const agent: t.TEphemeralAgent = {
+    mcp: modelSpec.mcpServers ?? [],
     web_search: modelSpec.webSearch ?? false,
     file_search: modelSpec.fileSearch ?? false,
     execute_code: modelSpec.executeCode ?? false,
-  });
+    artifacts: modelSpec.artifacts === true ? 'default' : modelSpec.artifacts || '',
+  };
+
+  // For existing conversations, layer per-conversation localStorage overrides
+  // on top of spec defaults so user modifications persist across navigation.
+  // If localStorage is empty (e.g., cleared), spec values stand alone.
+  if (key !== Constants.NEW_CONVO) {
+    const toolStorageMap: Array<[keyof t.TEphemeralAgent, string]> = [
+      ['execute_code', LocalStorageKeys.LAST_CODE_TOGGLE_],
+      ['web_search', LocalStorageKeys.LAST_WEB_SEARCH_TOGGLE_],
+      ['file_search', LocalStorageKeys.LAST_FILE_SEARCH_TOGGLE_],
+      ['artifacts', LocalStorageKeys.LAST_ARTIFACTS_TOGGLE_],
+    ];
+
+    for (const [toolKey, storagePrefix] of toolStorageMap) {
+      const raw = getTimestampedValue(`${storagePrefix}${key}`);
+      if (raw !== null) {
+        try {
+          agent[toolKey] = JSON.parse(raw) as never;
+        } catch {
+          // ignore parse errors
+        }
+      }
+    }
+
+    const mcpRaw = localStorage.getItem(`${LocalStorageKeys.LAST_MCP_}${key}`);
+    if (mcpRaw !== null) {
+      try {
+        const parsed = JSON.parse(mcpRaw);
+        if (Array.isArray(parsed)) {
+          agent.mcp = parsed;
+        }
+      } catch {
+        // ignore parse errors
+      }
+    }
+  }
+
+  updateEphemeralAgent(key, agent);
 }
 
 /**
diff --git a/client/src/utils/resources.ts b/client/src/utils/resources.ts
index f7c3586dfb..7a1e2b86c1 100644
--- a/client/src/utils/resources.ts
+++ b/client/src/utils/resources.ts
@@ -19,10 +19,10 @@ export const RESOURCE_CONFIGS: Record<ResourceType, ResourceConfig> = {
     defaultEditorRoleId: AccessRoleIds.AGENT_EDITOR,
     defaultOwnerRoleId: AccessRoleIds.AGENT_OWNER,
     getResourceUrl: (agentId: string) => `${window.location.origin}/c/new?agent_id=${agentId}`,
-    getResourceName: (name?: string) => (name && name !== '' ? `"${name}"` : 'agent'),
-    getShareMessage: (name?: string) => (name && name !== '' ? `"${name}"` : 'agent'),
+    getResourceName: (name?: string) => (name && name !== '' ? name : 'agent'),
+    getShareMessage: (name?: string) => (name && name !== '' ? name : 'agent'),
     getManageMessage: (name?: string) =>
-      `Manage permissions for ${name && name !== '' ? `"${name}"` : 'agent'}`,
+      `Manage permissions for ${name && name !== '' ? name : 'agent'}`,
     getCopyUrlMessage: () => 'Agent URL copied',
   },
   [ResourceType.PROMPTGROUP]: {
@@ -30,10 +30,10 @@ export const RESOURCE_CONFIGS: Record<ResourceType, ResourceConfig> = {
     defaultViewerRoleId: AccessRoleIds.PROMPTGROUP_VIEWER,
     defaultEditorRoleId: AccessRoleIds.PROMPTGROUP_EDITOR,
     defaultOwnerRoleId: AccessRoleIds.PROMPTGROUP_OWNER,
-    getResourceName: (name?: string) => (name && name !== '' ? `"${name}"` : 'prompt'),
-    getShareMessage: (name?: string) => (name && name !== '' ? `"${name}"` : 'prompt'),
+    getResourceName: (name?: string) => (name && name !== '' ? name : 'prompt'),
+    getShareMessage: (name?: string) => (name && name !== '' ? name : 'prompt'),
     getManageMessage: (name?: string) =>
-      `Manage permissions for ${name && name !== '' ? `"${name}"` : 'prompt'}`,
+      `Manage permissions for ${name && name !== '' ? name : 'prompt'}`,
     getCopyUrlMessage: () => 'Prompt URL copied',
   },
   [ResourceType.MCPSERVER]: {
@@ -41,12 +41,25 @@ export const RESOURCE_CONFIGS: Record<ResourceType, ResourceConfig> = {
     defaultViewerRoleId: AccessRoleIds.MCPSERVER_VIEWER,
     defaultEditorRoleId: AccessRoleIds.MCPSERVER_EDITOR,
     defaultOwnerRoleId: AccessRoleIds.MCPSERVER_OWNER,
-    getResourceName: (name?: string) => (name && name !== '' ? `"${name}"` : 'MCP server'),
-    getShareMessage: (name?: string) => (name && name !== '' ? `"${name}"` : 'MCP server'),
+    getResourceName: (name?: string) => (name && name !== '' ? name : 'MCP server'),
+    getShareMessage: (name?: string) => (name && name !== '' ? name : 'MCP server'),
     getManageMessage: (name?: string) =>
-      `Manage permissions for ${name && name !== '' ? `"${name}"` : 'MCP server'}`,
+      `Manage permissions for ${name && name !== '' ? name : 'MCP server'}`,
     getCopyUrlMessage: () => 'MCP Server URL copied',
   },
+  [ResourceType.REMOTE_AGENT]: {
+    resourceType: ResourceType.REMOTE_AGENT,
+    defaultViewerRoleId: AccessRoleIds.REMOTE_AGENT_VIEWER,
+    defaultEditorRoleId: AccessRoleIds.REMOTE_AGENT_EDITOR,
+    defaultOwnerRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+    getResourceUrl: () => `${window.location.origin}/api/v1/responses`,
+    getResourceName: (name?: string) => (name && name !== '' ? `"${name}"` : 'remote agent'),
+    getShareMessage: (name?: string) =>
+      name && name !== '' ? `"${name}" (API Access)` : 'remote agent access',
+    getManageMessage: (name?: string) =>
+      `Manage API access for ${name && name !== '' ? `"${name}"` : 'agent'}`,
+    getCopyUrlMessage: () => 'API endpoint copied',
+  },
 };
 
 export const getResourceConfig = (resourceType: ResourceType): ResourceConfig | undefined => {
diff --git a/client/src/utils/roles.ts b/client/src/utils/roles.ts
index 8bc38b7d52..1e8cb3d3b2 100644
--- a/client/src/utils/roles.ts
+++ b/client/src/utils/roles.ts
@@ -48,6 +48,18 @@ export const ROLE_LOCALIZATIONS = {
     name: 'com_ui_mcp_server_role_owner' as const,
     description: 'com_ui_mcp_server_role_owner_desc' as const,
   } as const,
+  remoteAgent_viewer: {
+    name: 'com_ui_remote_agent_role_viewer' as const,
+    description: 'com_ui_remote_agent_role_viewer_desc' as const,
+  } as const,
+  remoteAgent_editor: {
+    name: 'com_ui_remote_agent_role_editor' as const,
+    description: 'com_ui_remote_agent_role_editor_desc' as const,
+  } as const,
+  remoteAgent_owner: {
+    name: 'com_ui_remote_agent_role_owner' as const,
+    description: 'com_ui_remote_agent_role_owner_desc' as const,
+  } as const,
 };
 
 /**
diff --git a/client/tailwind.config.cjs b/client/tailwind.config.cjs
index c30d2ca703..624998e9d8 100644
--- a/client/tailwind.config.cjs
+++ b/client/tailwind.config.cjs
@@ -92,6 +92,7 @@ module.exports = {
         'text-secondary-alt': 'var(--text-secondary-alt)',
         'text-tertiary': 'var(--text-tertiary)',
         'text-warning': 'var(--text-warning)',
+        'text-destructive': 'var(--text-destructive)',
         'ring-primary': 'var(--ring-primary)',
         'header-primary': 'var(--header-primary)',
         'header-hover': 'var(--header-hover)',
@@ -118,6 +119,7 @@ module.exports = {
         'border-medium-alt': 'var(--border-medium-alt)',
         'border-heavy': 'var(--border-heavy)',
         'border-xheavy': 'var(--border-xheavy)',
+        'border-destructive': 'var(--border-destructive)',
         /* These are test styles */
         border: 'hsl(var(--border))',
         input: 'hsl(var(--input))',
diff --git a/config/create-user.js b/config/create-user.js
index 30cd6669ee..3688d736e2 100644
--- a/config/create-user.js
+++ b/config/create-user.js
@@ -14,7 +14,7 @@ const connect = require('./connect');
   console.purple('--------------------------');
 
   if (process.argv.length < 5) {
-    console.orange('Usage: npm run create-user <email> <name> <username> [--email-verified=false]');
+    console.orange('Usage: npm run create-user -- <email> <name> <username> [--email-verified=false]');
     console.orange('Note: if you do not pass in the arguments, you will be prompted for them.');
     console.orange(
       'If you really need to pass in the password, you can do so as the 4th argument (not recommended for security).',
@@ -88,7 +88,11 @@ If \`n\`, and email service is configured, the user will be sent a verification
 If \`n\`, and email service is not configured, you must have the \`ALLOW_UNVERIFIED_EMAIL_LOGIN\` .env variable set to true,
 or the user will need to attempt logging in to have a verification link sent to them.`);
 
-    if (emailVerifiedInput.toLowerCase() === 'n') {
+    const normalizedEmailVerifiedInput = emailVerifiedInput.trim().toLowerCase()
+
+    emailVerified = true
+
+    if (normalizedEmailVerifiedInput === 'n') {
       emailVerified = false;
     }
   }
diff --git a/config/delete-user.js b/config/delete-user.js
index 2d4dea0b37..5ad85577a4 100644
--- a/config/delete-user.js
+++ b/config/delete-user.js
@@ -23,6 +23,7 @@ const {
   PluginAuth,
   MemoryEntry,
   PromptGroup,
+  AgentApiKey,
   Transaction,
   Conversation,
   ConversationTag,
@@ -79,6 +80,7 @@ async function gracefulExit(code = 0) {
   const tasks = [
     Action.deleteMany({ user: uid }),
     Agent.deleteMany({ author: uid }),
+    AgentApiKey.deleteMany({ user: uid }),
     Assistant.deleteMany({ user: uid }),
     Balance.deleteMany({ user: uid }),
     ConversationTag.deleteMany({ user: uid }),
diff --git a/config/smart-reinstall.js b/config/smart-reinstall.js
new file mode 100644
index 0000000000..18fe689127
--- /dev/null
+++ b/config/smart-reinstall.js
@@ -0,0 +1,235 @@
+#!/usr/bin/env node
+/**
+ * Smart Reinstall for LibreChat
+ *
+ * Combines cached dependency installation with Turborepo-powered builds.
+ *
+ * Dependencies (npm ci):
+ *   Hashes package-lock.json and stores a marker in node_modules.
+ *   Skips npm ci entirely when the lockfile hasn't changed.
+ *
+ * Package builds (Turborepo):
+ *   Turbo hashes each package's source/config inputs, caches build
+ *   outputs (dist/), and restores from cache when inputs match.
+ *   Turbo v2 uses a global cache (~/.cache/turbo) that survives
+ *   npm ci and is shared across worktrees.
+ *
+ * Usage:
+ *   npm run smart-reinstall                  # Smart cached mode
+ *   npm run smart-reinstall -- --force       # Full clean reinstall, bust all caches
+ *   npm run smart-reinstall -- --skip-client # Skip frontend (Vite) build
+ *   npm run smart-reinstall -- --clean-cache # Wipe turbo build cache
+ *   npm run smart-reinstall -- --verbose     # Turbo verbose output
+ */
+
+const crypto = require('crypto');
+const fs = require('fs');
+const path = require('path');
+const { execSync } = require('child_process');
+
+// Adds console.green, console.purple, etc.
+require('./helpers');
+
+// ─── Configuration ───────────────────────────────────────────────────────────
+
+const ROOT_DIR = path.resolve(__dirname, '..');
+const DEPS_HASH_MARKER = path.join(ROOT_DIR, 'node_modules', '.librechat-deps-hash');
+
+const flags = {
+  force: process.argv.includes('--force'),
+  cleanCache: process.argv.includes('--clean-cache'),
+  skipClient: process.argv.includes('--skip-client'),
+  verbose: process.argv.includes('--verbose'),
+};
+
+// Workspace directories whose node_modules should be cleaned during reinstall
+const NODE_MODULES_DIRS = [
+  ROOT_DIR,
+  path.join(ROOT_DIR, 'packages', 'data-provider'),
+  path.join(ROOT_DIR, 'packages', 'data-schemas'),
+  path.join(ROOT_DIR, 'packages', 'client'),
+  path.join(ROOT_DIR, 'packages', 'api'),
+  path.join(ROOT_DIR, 'client'),
+  path.join(ROOT_DIR, 'api'),
+];
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+function hashFile(filePath) {
+  return crypto.createHash('sha256').update(fs.readFileSync(filePath)).digest('hex').slice(0, 16);
+}
+
+function exec(cmd, opts = {}) {
+  execSync(cmd, { cwd: ROOT_DIR, stdio: 'inherit', ...opts });
+}
+
+// ─── Dependency Installation ─────────────────────────────────────────────────
+
+function checkDeps() {
+  const lockfile = path.join(ROOT_DIR, 'package-lock.json');
+  if (!fs.existsSync(lockfile)) {
+    return { needsInstall: true, hash: 'missing' };
+  }
+
+  const hash = hashFile(lockfile);
+
+  if (!fs.existsSync(path.join(ROOT_DIR, 'node_modules'))) {
+    return { needsInstall: true, hash };
+  }
+  if (!fs.existsSync(DEPS_HASH_MARKER)) {
+    return { needsInstall: true, hash };
+  }
+
+  const stored = fs.readFileSync(DEPS_HASH_MARKER, 'utf-8').trim();
+  return { needsInstall: stored !== hash, hash };
+}
+
+function installDeps(hash) {
+  const { deleteNodeModules } = require('./helpers');
+  NODE_MODULES_DIRS.forEach(deleteNodeModules);
+
+  console.purple('Cleaning npm cache...');
+  exec('npm cache clean --force');
+
+  console.purple('Installing dependencies (npm ci)...');
+  exec('npm ci');
+
+  fs.writeFileSync(DEPS_HASH_MARKER, hash, 'utf-8');
+}
+
+// ─── Turbo Build ─────────────────────────────────────────────────────────────
+
+function runTurboBuild() {
+  const args = ['npx', 'turbo', 'run', 'build'];
+
+  if (flags.skipClient) {
+    args.push('--filter=!@librechat/frontend');
+  }
+
+  if (flags.force) {
+    args.push('--force');
+  }
+
+  if (flags.verbose) {
+    args.push('--verbosity=2');
+  }
+
+  const cmd = args.join(' ');
+  console.gray(`      ${cmd}\n`);
+  exec(cmd);
+}
+
+/**
+ * Fallback for when turbo is not installed (e.g., first run before npm ci).
+ * Runs the same sequential build as the original `npm run frontend`.
+ */
+function runFallbackBuild() {
+  console.orange('      turbo not found — using sequential fallback build\n');
+
+  const scripts = [
+    'build:data-provider',
+    'build:data-schemas',
+    'build:api',
+    'build:client-package',
+  ];
+
+  if (!flags.skipClient) {
+    scripts.push('build:client');
+  }
+
+  for (const script of scripts) {
+    console.purple(`  Running ${script}...`);
+    exec(`npm run ${script}`);
+  }
+}
+
+function hasTurbo() {
+  const binDir = path.join(ROOT_DIR, 'node_modules', '.bin');
+  return ['turbo', 'turbo.cmd', 'turbo.ps1'].some((name) => fs.existsSync(path.join(binDir, name)));
+}
+
+// ─── Main ────────────────────────────────────────────────────────────────────
+
+(async () => {
+  const startTime = Date.now();
+
+  console.green('\n Smart Reinstall — LibreChat');
+  console.green('─'.repeat(45));
+
+  // ── Handle --clean-cache ───────────────────────────────────────────────
+  if (flags.cleanCache) {
+    console.purple('Clearing Turborepo cache...');
+    if (hasTurbo()) {
+      try {
+        exec('npx turbo daemon stop', { stdio: 'pipe' });
+      } catch {
+        // ignore — daemon may not be running
+      }
+    }
+    // Clear local .turbo cache dir
+    const localTurboCache = path.join(ROOT_DIR, '.turbo');
+    if (fs.existsSync(localTurboCache)) {
+      fs.rmSync(localTurboCache, { recursive: true });
+    }
+    // Clear global turbo cache
+    if (hasTurbo()) {
+      try {
+        exec('npx turbo clean', { stdio: 'pipe' });
+        console.green('Turbo cache cleared.');
+      } catch {
+        console.gray('Could not clear global turbo cache (may not exist yet).');
+      }
+    } else {
+      console.gray('turbo not installed — nothing to clear.');
+    }
+
+    if (!flags.force) {
+      return;
+    }
+  }
+
+  // ── Step 1: Dependencies ───────────────────────────────────────────────
+  console.purple('\n[1/2] Checking dependencies...');
+
+  if (flags.force) {
+    console.orange('      Force mode — reinstalling all dependencies');
+    const lockfile = path.join(ROOT_DIR, 'package-lock.json');
+    const hash = fs.existsSync(lockfile) ? hashFile(lockfile) : 'none';
+    installDeps(hash);
+    console.green('      Dependencies installed.');
+  } else {
+    const { needsInstall, hash } = checkDeps();
+    if (needsInstall) {
+      console.orange('      package-lock.json changed or node_modules missing');
+      installDeps(hash);
+      console.green('      Dependencies installed.');
+    } else {
+      console.green('      Dependencies up to date — skipping npm ci');
+    }
+  }
+
+  // ── Step 2: Build packages ─────────────────────────────────────────────
+  console.purple('\n[2/2] Building packages...');
+
+  if (hasTurbo()) {
+    runTurboBuild();
+  } else {
+    runFallbackBuild();
+  }
+
+  // ── Done ───────────────────────────────────────────────────────────────
+  const elapsed = ((Date.now() - startTime) / 1000).toFixed(1);
+  console.log('');
+  console.green('─'.repeat(45));
+  console.green(`  Done (${elapsed}s)`);
+  console.green('  Start the app with:  npm run backend');
+  console.green('─'.repeat(45));
+})().catch((err) => {
+  console.red(`\nError: ${err.message}`);
+  if (flags.verbose) {
+    console.red(err.stack);
+  }
+  console.gray('  Tip: run with --force to clean all caches and reinstall from scratch');
+  console.gray('  Tip: run with --verbose for detailed output');
+  process.exit(1);
+});
diff --git a/e2e/jestSetup.js b/e2e/jestSetup.js
index ce2f7a89c2..b4c48f79ea 100644
--- a/e2e/jestSetup.js
+++ b/e2e/jestSetup.js
@@ -1,3 +1,3 @@
-// v0.8.2-rc2
+// v0.8.2
 // See .env.test.example for an example of the '.env.test' file.
 require('dotenv').config({ path: './e2e/.env.test' });
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 9990e0fc35..f53c4e83dd 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -291,6 +291,15 @@ export default [
     files: ['./packages/api/**/*.ts'],
     rules: {
       'lines-between-class-members': ['error', 'always', { exceptAfterSingleLine: true }],
+      '@typescript-eslint/no-unused-vars': [
+        'warn',
+        {
+          argsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_',
+          destructuredArrayIgnorePattern: '^_',
+        },
+      ],
     },
   },
   {
diff --git a/helm/librechat-rag-api/Chart.yaml b/helm/librechat-rag-api/Chart.yaml
index 38d1470e49..cc382f0501 100755
--- a/helm/librechat-rag-api/Chart.yaml
+++ b/helm/librechat-rag-api/Chart.yaml
@@ -14,7 +14,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.5.2
+version: 0.5.3
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
diff --git a/helm/librechat-rag-api/templates/rag-deployment.yaml b/helm/librechat-rag-api/templates/rag-deployment.yaml
index 5324ee3f7e..1978260723 100755
--- a/helm/librechat-rag-api/templates/rag-deployment.yaml
+++ b/helm/librechat-rag-api/templates/rag-deployment.yaml
@@ -26,6 +26,9 @@ spec:
       imagePullSecrets:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- if kindIs "bool" .Values.enableServiceLinks }}
+      enableServiceLinks: {{ .Values.enableServiceLinks }}
+      {{- end }}
       securityContext:
         {{- toYaml .Values.podSecurityContext | nindent 8 }}
       containers:
diff --git a/helm/librechat-rag-api/values.yaml b/helm/librechat-rag-api/values.yaml
index cd722bc096..3e1b61208a 100755
--- a/helm/librechat-rag-api/values.yaml
+++ b/helm/librechat-rag-api/values.yaml
@@ -40,6 +40,11 @@ fullnameOverride: ''
 podAnnotations: {}
 podLabels: {}
 
+# Enable or disable injection of service environment variables into pods.
+# When running in namespaces with many services, the injected variables can cause
+# "argument list too long" errors. Set to false to disable.
+enableServiceLinks: true
+
 podSecurityContext: {} # fsGroup: 2000
 
 securityContext: {}
diff --git a/helm/librechat/Chart.yaml b/helm/librechat/Chart.yaml
index 996d6fc6f9..52203aa8f4 100755
--- a/helm/librechat/Chart.yaml
+++ b/helm/librechat/Chart.yaml
@@ -15,7 +15,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 1.9.5
+version: 1.9.8
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
@@ -23,7 +23,7 @@ version: 1.9.5
 # It is recommended to use it with quotes.
 
 # renovate: image=ghcr.io/danny-avila/librechat
-appVersion: "v0.8.2-rc2"
+appVersion: "v0.8.2"
 
 home: https://www.librechat.ai
 
@@ -36,7 +36,11 @@ dependencies:
     version: "0.11.0"
     condition: meilisearch.enabled
     repository: "https://meilisearch.github.io/meilisearch-kubernetes"
+  - name: redis
+    version: "24.1.3"
+    condition: redis.enabled
+    repository: "https://charts.bitnami.com/bitnami"
   - name: librechat-rag-api
-    version: "0.5.2"
+    version: "0.5.3"
     condition: librechat-rag-api.enabled
     repository: file://../librechat-rag-api
diff --git a/helm/librechat/templates/configmap-env.yaml b/helm/librechat/templates/configmap-env.yaml
index 0817ceeaff..ed5ac822da 100755
--- a/helm/librechat/templates/configmap-env.yaml
+++ b/helm/librechat/templates/configmap-env.yaml
@@ -12,6 +12,12 @@ data:
   {{- if and (not (dig "configEnv" "MONGO_URI" "" .Values.librechat)) .Values.mongodb.enabled }}
   MONGO_URI: mongodb://{{ include "mongodb.service.nameOverride" .Subcharts.mongodb }}.{{ .Release.Namespace | lower }}.svc.cluster.local:27017/LibreChat
   {{- end }}
+  {{- if and (not (dig "configEnv" "USE_REDIS" "" .Values.librechat)) .Values.redis.enabled }}
+  USE_REDIS: "true"
+  {{- end }}
+  {{- if and (not (dig "configEnv" "REDIS_URI" "" .Values.librechat)) .Values.redis.enabled }}
+  REDIS_URI: redis://{{ include "common.names.fullname" .Subcharts.redis }}-master.{{ .Release.Namespace | lower }}.svc.cluster.local:6379
+  {{- end }}
   {{- if .Values.librechat.configEnv }}
   {{- toYaml .Values.librechat.configEnv | nindent 2 }}
   {{- end }}
\ No newline at end of file
diff --git a/helm/librechat/templates/deployment.yaml b/helm/librechat/templates/deployment.yaml
index f8d0e58298..279749185b 100755
--- a/helm/librechat/templates/deployment.yaml
+++ b/helm/librechat/templates/deployment.yaml
@@ -49,6 +49,9 @@ spec:
         {{- toYaml . | nindent 8 }}
       {{- end }}
       serviceAccountName: {{ include "librechat.serviceAccountName" . }}
+      {{- if kindIs "bool" .Values.enableServiceLinks }}
+      enableServiceLinks: {{ .Values.enableServiceLinks }}
+      {{- end }}
       securityContext:
         {{- toYaml .Values.podSecurityContext | nindent 8 }}
       {{- if .Values.initContainers }}
diff --git a/helm/librechat/values.yaml b/helm/librechat/values.yaml
index a15b681de2..a4c877d64d 100755
--- a/helm/librechat/values.yaml
+++ b/helm/librechat/values.yaml
@@ -97,7 +97,6 @@ librechat:
   #         titleModel: "gpt-3.5-turbo"
   #         summarize: false
   #         summaryModel: "gpt-3.5-turbo"
-  #         forcePrompt: false
   #         modelDisplayLabel: "OpenRouter"
 
   # name of existing Yaml configmap, key must be librechat.yaml
@@ -154,6 +153,11 @@ podLabels: {}
 deploymentAnnotations: {}
 deploymentLabels: {}
 
+# Enable or disable injection of service environment variables into pods.
+# When running in namespaces with many services, the injected variables can cause
+# "argument list too long" errors. Set to false to disable.
+enableServiceLinks: true
+
 podSecurityContext:
   fsGroup: 2000
 
@@ -300,8 +304,15 @@ meilisearch:
   persistence:
     enabled: true
     storageClass: ""
-  image: 
+  image:
     tag: "v1.7.3"
   auth:
     # Use an existing Kubernetes secret for the MEILI_MASTER_KEY
     existingMasterKeySecret: "librechat-credentials-env"
+
+# Redis Parameters
+redis:
+  enabled: false
+  architecture: standalone
+  auth:
+    enabled: false
diff --git a/librechat.example.yaml b/librechat.example.yaml
index 34a2f84742..1aad6566be 100644
--- a/librechat.example.yaml
+++ b/librechat.example.yaml
@@ -102,17 +102,14 @@ interface:
   marketplace:
     use: false
   fileCitations: true
-  mcpServers:
-    # MCP Servers configuration
+  # MCP Servers configuration example
+  # mcpServers:
     # Controls user permissions for MCP (Model Context Protocol) server management
     # - use: Allow users to use configured MCP servers
     # - create: Allow users to create and manage new MCP servers
     # - share: Allow users to share MCP servers with other users
     # - public: Allow users to share MCP servers publicly (with everyone)
-    use: false
-    share: false
-    create: false
-    public: false
+     
     # Creation / edit MCP server config Dialog config example
     # trustCheckbox:
     #   label:
@@ -380,9 +377,6 @@ endpoints:
       # Summary Model: Specify the model to use if summarization is enabled.
       # summaryModel: "mistral-tiny"  # Defaults to "gpt-3.5-turbo" if omitted.
 
-      # Force Prompt setting: If true, sends a `prompt` parameter instead of `messages`.
-      # forcePrompt: false
-
       # The label displayed for the AI model in messages.
       modelDisplayLabel: 'Mistral' # Default is "AI" when not set.
 
@@ -442,25 +436,38 @@ endpoints:
       titleModel: 'current_model'
       summarize: false
       summaryModel: 'current_model'
-      forcePrompt: false
       modelDisplayLabel: 'Portkey'
       iconURL: https://images.crunchbase.com/image/upload/c_pad,f_auto,q_auto:eco,dpr_1/rjqy7ghvjoiu4cd1xjbf
 
   # AWS Bedrock Example
   # Note: Bedrock endpoint is configured via environment variables
   # bedrock:
+  #   # Models Configuration
+  #   # Specify which models are available (equivalent to BEDROCK_AWS_MODELS env variable)
+  #   models:
+  #     - "anthropic.claude-3-7-sonnet-20250219-v1:0"
+  #     - "anthropic.claude-3-5-sonnet-20241022-v2:0"
+  #
+  #   # Inference Profiles Configuration
+  #   # Maps model IDs to their inference profile ARNs
+  #   # IMPORTANT: The model ID (key) MUST be a valid AWS Bedrock model ID that you've added to the models list above
+  #   # The ARN (value) is the inference profile you wish to map to for that model
+  #   # Both the model ID and ARN are sent to AWS - the model ID for validation/metadata, the ARN for routing
+  #   inferenceProfiles:
+  #     "us.anthropic.claude-sonnet-4-20250514-v1:0": "${BEDROCK_INFERENCE_PROFILE_CLAUDE_SONNET}"
+  #     "anthropic.claude-3-7-sonnet-20250219-v1:0": "arn:aws:bedrock:us-west-2:123456789012:application-inference-profile/abc123"
+  #
   #   # Guardrail Configuration
   #   guardrailConfig:
   #     guardrailIdentifier: "your-guardrail-id"
   #     guardrailVersion: "1"
-  #     
+  #
   #     # Trace behavior for debugging (optional)
   #     # - "enabled": Include basic trace information about guardrail assessments
   #     # - "enabled_full": Include comprehensive trace details (recommended for debugging)
   #     # - "disabled": No trace information (default)
   #     # Trace output is logged to application log files for compliance auditing
   #     trace: "enabled"
-
 # Example modelSpecs configuration showing grouping options
 # The 'group' field organizes model specs in the UI selector:
 # - If 'group' matches an endpoint name (e.g., "openAI", "groq"), the spec appears nested under that endpoint
diff --git a/package-lock.json b/package-lock.json
index 18e55217d6..00ea747ddb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "LibreChat",
-  "version": "v0.8.2-rc2",
+  "version": "v0.8.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "LibreChat",
-      "version": "v0.8.2-rc2",
+      "version": "v0.8.2",
       "license": "ISC",
       "workspaces": [
         "api",
@@ -40,33 +40,33 @@
         "lint-staged": "^15.4.3",
         "prettier": "^3.5.0",
         "prettier-plugin-tailwindcss": "^0.6.11",
+        "turbo": "^2.8.7",
         "typescript-eslint": "^8.24.0"
       }
     },
     "api": {
       "name": "@librechat/backend",
-      "version": "v0.8.2-rc2",
+      "version": "v0.8.2",
       "license": "ISC",
       "dependencies": {
-        "@anthropic-ai/sdk": "^0.71.0",
-        "@anthropic-ai/vertex-sdk": "^0.14.0",
-        "@aws-sdk/client-bedrock-runtime": "^3.941.0",
-        "@aws-sdk/client-s3": "^3.758.0",
+        "@anthropic-ai/vertex-sdk": "^0.14.3",
+        "@aws-sdk/client-bedrock-runtime": "^3.980.0",
+        "@aws-sdk/client-s3": "^3.980.0",
         "@aws-sdk/s3-request-presigner": "^3.758.0",
         "@azure/identity": "^4.7.0",
         "@azure/search-documents": "^12.0.0",
-        "@azure/storage-blob": "^12.27.0",
+        "@azure/storage-blob": "^12.30.0",
         "@google/genai": "^1.19.0",
         "@keyv/redis": "^4.3.3",
         "@langchain/core": "^0.3.80",
-        "@librechat/agents": "^3.0.77",
+        "@librechat/agents": "^3.1.50",
         "@librechat/api": "*",
         "@librechat/data-schemas": "*",
         "@microsoft/microsoft-graph-client": "^3.0.7",
-        "@modelcontextprotocol/sdk": "^1.25.2",
+        "@modelcontextprotocol/sdk": "^1.26.0",
         "@node-saml/passport-saml": "^5.1.0",
         "@smithy/node-http-handler": "^4.4.5",
-        "axios": "^1.12.1",
+        "axios": "^1.13.5",
         "bcryptjs": "^2.4.3",
         "compression": "^1.8.1",
         "connect-redis": "^8.1.0",
@@ -94,7 +94,7 @@
         "keyv-file": "^5.1.2",
         "klona": "^2.0.6",
         "librechat-data-provider": "*",
-        "lodash": "^4.17.21",
+        "lodash": "^4.17.23",
         "mathjs": "^15.1.0",
         "meilisearch": "^0.38.0",
         "memorystore": "^1.6.7",
@@ -122,7 +122,7 @@
         "tiktoken": "^1.0.15",
         "traverse": "^0.6.7",
         "ua-parser-js": "^1.0.36",
-        "undici": "^7.10.0",
+        "undici": "^7.18.2",
         "winston": "^3.11.0",
         "winston-daily-rotate-file": "^5.0.0",
         "zod": "^3.22.4"
@@ -134,26 +134,6 @@
         "supertest": "^7.1.0"
       }
     },
-    "api/node_modules/@anthropic-ai/sdk": {
-      "version": "0.71.2",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.71.2.tgz",
-      "integrity": "sha512-TGNDEUuEstk/DKu0/TflXAEt+p+p/WhTlFzEnoosvbaDU2LTjm42igSdlL0VijrKpWejtOKxX0b8A7uc+XiSAQ==",
-      "license": "MIT",
-      "dependencies": {
-        "json-schema-to-ts": "^3.1.1"
-      },
-      "bin": {
-        "anthropic-ai-sdk": "bin/cli"
-      },
-      "peerDependencies": {
-        "zod": "^3.25.0 || ^4.0.0"
-      },
-      "peerDependenciesMeta": {
-        "zod": {
-          "optional": true
-        }
-      }
-    },
     "api/node_modules/@node-saml/node-saml": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/@node-saml/node-saml/-/node-saml-5.1.0.tgz",
@@ -287,24 +267,6 @@
         "node": ">= 0.8.0"
       }
     },
-    "api/node_modules/express-rate-limit": {
-      "version": "8.2.1",
-      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-8.2.1.tgz",
-      "integrity": "sha512-PCZEIEIxqwhzw4KF0n7QF4QqruVTcF73O5kFKUnGOyjbCCgizBBiFaYpd/fnBLUMPw/BWw9OsiN7GgrNYr7j6g==",
-      "license": "MIT",
-      "dependencies": {
-        "ip-address": "10.0.1"
-      },
-      "engines": {
-        "node": ">= 16"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/express-rate-limit"
-      },
-      "peerDependencies": {
-        "express": ">= 4.11"
-      }
-    },
     "api/node_modules/jose": {
       "version": "6.1.3",
       "resolved": "https://registry.npmjs.org/jose/-/jose-6.1.3.tgz",
@@ -442,7 +404,7 @@
     },
     "client": {
       "name": "@librechat/frontend",
-      "version": "v0.8.2-rc2",
+      "version": "v0.8.2",
       "license": "ISC",
       "dependencies": {
         "@ariakit/react": "^0.4.15",
@@ -493,10 +455,10 @@
         "jotai": "^2.12.5",
         "js-cookie": "^3.0.5",
         "librechat-data-provider": "*",
-        "lodash": "^4.17.21",
+        "lodash": "^4.17.23",
         "lucide-react": "^0.394.0",
         "match-sorter": "^8.1.0",
-        "mermaid": "^11.12.2",
+        "mermaid": "^11.12.3",
         "micromark-extension-llm-math": "^3.1.0",
         "qrcode.react": "^4.2.0",
         "rc-input-number": "^7.4.2",
@@ -564,7 +526,6 @@
         "jest-file-loader": "^1.0.3",
         "jest-junit": "^16.0.0",
         "postcss": "^8.4.31",
-        "postcss-loader": "^7.1.0",
         "postcss-preset-env": "^8.2.0",
         "tailwindcss": "^3.4.1",
         "typescript": "^5.3.3",
@@ -2099,9 +2060,9 @@
       }
     },
     "node_modules/@anthropic-ai/sdk": {
-      "version": "0.65.0",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.65.0.tgz",
-      "integrity": "sha512-zIdPOcrCVEI8t3Di40nH4z9EoeyGZfXbYSvWdDLsB/KkaSYMnEgC7gmcgWu83g2NTn1ZTpbMvpdttWDGGIk6zw==",
+      "version": "0.73.0",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.73.0.tgz",
+      "integrity": "sha512-URURVzhxXGJDGUGFunIOtBlSl7KWvZiAAKY/ttTkZAkXT9bTPqdk2eK0b8qqSxXpikh3QKPnPYpiyX98zf5ebw==",
       "license": "MIT",
       "dependencies": {
         "json-schema-to-ts": "^3.1.1"
@@ -2119,9 +2080,9 @@
       }
     },
     "node_modules/@anthropic-ai/vertex-sdk": {
-      "version": "0.14.0",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/vertex-sdk/-/vertex-sdk-0.14.0.tgz",
-      "integrity": "sha512-YIonqYEwQ9ILvpeOUBRBCv+91nzIs/MAZIAJ6yyJ3muwoTbZdEu54A2HcM4nRHH+Gy1vxz0FVau6aGSayXNeWQ==",
+      "version": "0.14.3",
+      "resolved": "https://registry.npmjs.org/@anthropic-ai/vertex-sdk/-/vertex-sdk-0.14.3.tgz",
+      "integrity": "sha512-GJZTkkvN66gM3Epqm9laKEjC3orQqzmQt8JAgTN9+zlb+I+1/oEd3Z7rj2tkEKCTeOUVScdhcXPudN8GdpuGqA==",
       "license": "MIT",
       "dependencies": {
         "@anthropic-ai/sdk": ">=0.50.3 <1",
@@ -2388,238 +2349,72 @@
       }
     },
     "node_modules/@aws-sdk/client-bedrock-agent-runtime": {
-      "version": "3.927.0",
-      "resolved": "https://registry.npmjs.org/@aws-sdk/client-bedrock-agent-runtime/-/client-bedrock-agent-runtime-3.927.0.tgz",
-      "integrity": "sha512-k2UeG/+Ka74jztHDzYNrpNLDSsMCst+ph3+e7uAX5Jmo40tVKa+sVu4DkV3BIXuktc6jqM1ewtfPNug79kN6JQ==",
+      "version": "3.984.0",
+      "resolved": "https://registry.npmjs.org/@aws-sdk/client-bedrock-agent-runtime/-/client-bedrock-agent-runtime-3.984.0.tgz",
+      "integrity": "sha512-oZGlDtjWUNUDTpXYeRpnKM66W/x+HjxV+zesSVFPHOVgdNI7eU00GtMYg0Wk0YKZTSPpNAPV7RhxkMSQuyVa6g==",
       "license": "Apache-2.0",
       "dependencies": {
         "@aws-crypto/sha256-browser": "5.2.0",
         "@aws-crypto/sha256-js": "5.2.0",
-        "@aws-sdk/core": "3.927.0",
-        "@aws-sdk/credential-provider-node": "3.927.0",
-        "@aws-sdk/middleware-host-header": "3.922.0",
-        "@aws-sdk/middleware-logger": "3.922.0",
-        "@aws-sdk/middleware-recursion-detection": "3.922.0",
-        "@aws-sdk/middleware-user-agent": "3.927.0",
-        "@aws-sdk/region-config-resolver": "3.925.0",
-        "@aws-sdk/types": "3.922.0",
-        "@aws-sdk/util-endpoints": "3.922.0",
-        "@aws-sdk/util-user-agent-browser": "3.922.0",
-        "@aws-sdk/util-user-agent-node": "3.927.0",
-        "@smithy/config-resolver": "^4.4.2",
-        "@smithy/core": "^3.17.2",
-        "@smithy/eventstream-serde-browser": "^4.2.4",
-        "@smithy/eventstream-serde-config-resolver": "^4.3.4",
-        "@smithy/eventstream-serde-node": "^4.2.4",
-        "@smithy/fetch-http-handler": "^5.3.5",
-        "@smithy/hash-node": "^4.2.4",
-        "@smithy/invalid-dependency": "^4.2.4",
-        "@smithy/middleware-content-length": "^4.2.4",
-        "@smithy/middleware-endpoint": "^4.3.6",
-        "@smithy/middleware-retry": "^4.4.6",
-        "@smithy/middleware-serde": "^4.2.4",
-        "@smithy/middleware-stack": "^4.2.4",
-        "@smithy/node-config-provider": "^4.3.4",
-        "@smithy/node-http-handler": "^4.4.4",
-        "@smithy/protocol-http": "^5.3.4",
-        "@smithy/smithy-client": "^4.9.2",
-        "@smithy/types": "^4.8.1",
-        "@smithy/url-parser": "^4.2.4",
+        "@aws-sdk/core": "^3.973.6",
+        "@aws-sdk/credential-provider-node": "^3.972.5",
+        "@aws-sdk/middleware-host-header": "^3.972.3",
+        "@aws-sdk/middleware-logger": "^3.972.3",
+        "@aws-sdk/middleware-recursion-detection": "^3.972.3",
+        "@aws-sdk/middleware-user-agent": "^3.972.6",
+        "@aws-sdk/region-config-resolver": "^3.972.3",
+        "@aws-sdk/types": "^3.973.1",
+        "@aws-sdk/util-endpoints": "3.984.0",
+        "@aws-sdk/util-user-agent-browser": "^3.972.3",
+        "@aws-sdk/util-user-agent-node": "^3.972.4",
+        "@smithy/config-resolver": "^4.4.6",
+        "@smithy/core": "^3.22.0",
+        "@smithy/eventstream-serde-browser": "^4.2.8",
+        "@smithy/eventstream-serde-config-resolver": "^4.3.8",
+        "@smithy/eventstream-serde-node": "^4.2.8",
+        "@smithy/fetch-http-handler": "^5.3.9",
+        "@smithy/hash-node": "^4.2.8",
+        "@smithy/invalid-dependency": "^4.2.8",
+        "@smithy/middleware-content-length": "^4.2.8",
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       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/web-namespaces/-/web-namespaces-2.0.1.tgz",
@@ -42047,63 +41161,6 @@
         "node": ">=12"
       }
     },
-    "node_modules/webpack": {
-      "version": "5.94.0",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.94.0.tgz",
-      "integrity": "sha512-KcsGn50VT+06JH/iunZJedYGUJS5FGjow8wb9c0v5n1Om8O1g4L6LjtfxwlXIATopoQu+vOXXa7gYisWxCoPyg==",
-      "dev": true,
-      "peer": true,
-      "dependencies": {
-        "@types/estree": "^1.0.5",
-        "@webassemblyjs/ast": "^1.12.1",
-        "@webassemblyjs/wasm-edit": "^1.12.1",
-        "@webassemblyjs/wasm-parser": "^1.12.1",
-        "acorn": "^8.7.1",
-        "acorn-import-attributes": "^1.9.5",
-        "browserslist": "^4.21.10",
-        "chrome-trace-event": "^1.0.2",
-        "enhanced-resolve": "^5.17.1",
-        "es-module-lexer": "^1.2.1",
-        "eslint-scope": "5.1.1",
-        "events": "^3.2.0",
-        "glob-to-regexp": "^0.4.1",
-        "graceful-fs": "^4.2.11",
-        "json-parse-even-better-errors": "^2.3.1",
-        "loader-runner": "^4.2.0",
-        "mime-types": "^2.1.27",
-        "neo-async": "^2.6.2",
-        "schema-utils": "^3.2.0",
-        "tapable": "^2.1.1",
-        "terser-webpack-plugin": "^5.3.10",
-        "watchpack": "^2.4.1",
-        "webpack-sources": "^3.2.3"
-      },
-      "bin": {
-        "webpack": "bin/webpack.js"
-      },
-      "engines": {
-        "node": ">=10.13.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/webpack"
-      },
-      "peerDependenciesMeta": {
-        "webpack-cli": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/webpack-sources": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-3.2.3.tgz",
-      "integrity": "sha512-/DyMEOrDgLKKIG0fmvtz+4dUX/3Ghozwgm6iPp8KRhvn+eQf9+Q7GWxVNMk3+uCPWfdXYC4ExGBckIXdFEfH1w==",
-      "dev": true,
-      "peer": true,
-      "engines": {
-        "node": ">=10.13.0"
-      }
-    },
     "node_modules/websocket-driver": {
       "version": "0.7.4",
       "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.4.tgz",
@@ -43070,9 +42127,9 @@
       }
     },
     "node_modules/zod-to-json-schema": {
-      "version": "3.25.0",
-      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.0.tgz",
-      "integrity": "sha512-HvWtU2UG41LALjajJrML6uQejQhNJx+JBO9IflpSja4R03iNWfKXrj6W2h7ljuLyc1nKS+9yDyL/9tD1U/yBnQ==",
+      "version": "3.25.1",
+      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.1.tgz",
+      "integrity": "sha512-pM/SU9d3YAggzi6MtR4h7ruuQlqKtad8e9S0fmxcMi+ueAK5Korys/aWcV9LIIHTVbj01NdzxcnXSN+O74ZIVA==",
       "license": "ISC",
       "peerDependencies": {
         "zod": "^3.25 || ^4"
@@ -43089,7 +42146,7 @@
     },
     "packages/api": {
       "name": "@librechat/api",
-      "version": "1.7.20",
+      "version": "1.7.22",
       "license": "ISC",
       "devDependencies": {
         "@babel/preset-env": "^7.21.5",
@@ -43102,7 +42159,6 @@
         "@rollup/plugin-replace": "^5.0.5",
         "@rollup/plugin-typescript": "^12.1.2",
         "@types/bun": "^1.2.15",
-        "@types/diff": "^6.0.0",
         "@types/express": "^5.0.0",
         "@types/express-session": "^1.18.2",
         "@types/jest": "^29.5.2",
@@ -43123,22 +42179,21 @@
         "typescript": "^5.0.4"
       },
       "peerDependencies": {
-        "@anthropic-ai/vertex-sdk": "^0.14.0",
-        "@aws-sdk/client-bedrock-runtime": "^3.941.0",
-        "@aws-sdk/client-s3": "^3.758.0",
+        "@anthropic-ai/vertex-sdk": "^0.14.3",
+        "@aws-sdk/client-bedrock-runtime": "^3.970.0",
+        "@aws-sdk/client-s3": "^3.980.0",
         "@azure/identity": "^4.7.0",
         "@azure/search-documents": "^12.0.0",
-        "@azure/storage-blob": "^12.27.0",
+        "@azure/storage-blob": "^12.30.0",
         "@google/genai": "^1.19.0",
         "@keyv/redis": "^4.3.3",
         "@langchain/core": "^0.3.80",
-        "@librechat/agents": "^3.0.77",
+        "@librechat/agents": "^3.1.50",
         "@librechat/data-schemas": "*",
-        "@modelcontextprotocol/sdk": "^1.25.2",
+        "@modelcontextprotocol/sdk": "^1.26.0",
         "@smithy/node-http-handler": "^4.4.5",
-        "axios": "^1.12.1",
+        "axios": "^1.13.5",
         "connect-redis": "^8.1.0",
-        "diff": "^7.0.0",
         "eventsource": "^3.0.2",
         "express": "^5.1.0",
         "express-session": "^1.18.2",
@@ -43158,7 +42213,7 @@
         "node-fetch": "2.7.0",
         "rate-limit-redis": "^4.2.0",
         "tiktoken": "^1.0.15",
-        "undici": "^7.10.0",
+        "undici": "^7.18.2",
         "zod": "^3.22.4"
       }
     },
@@ -43202,7 +42257,7 @@
     },
     "packages/client": {
       "name": "@librechat/client",
-      "version": "0.4.4",
+      "version": "0.4.51",
       "devDependencies": {
         "@babel/core": "^7.28.5",
         "@babel/preset-env": "^7.28.5",
@@ -45492,10 +44547,10 @@
     },
     "packages/data-provider": {
       "name": "librechat-data-provider",
-      "version": "0.8.220",
+      "version": "0.8.231",
       "license": "ISC",
       "dependencies": {
-        "axios": "^1.12.1",
+        "axios": "^1.13.5",
         "dayjs": "^1.11.13",
         "js-yaml": "^4.1.1",
         "zod": "^3.22.4"
@@ -45550,7 +44605,7 @@
     },
     "packages/data-schemas": {
       "name": "@librechat/data-schemas",
-      "version": "0.0.33",
+      "version": "0.0.35",
       "license": "MIT",
       "devDependencies": {
         "@rollup/plugin-alias": "^5.1.0",
@@ -45560,7 +44615,6 @@
         "@rollup/plugin-replace": "^5.0.5",
         "@rollup/plugin-terser": "^0.4.4",
         "@rollup/plugin-typescript": "^12.1.2",
-        "@types/diff": "^6.0.0",
         "@types/express": "^5.0.0",
         "@types/jest": "^29.5.2",
         "@types/node": "^20.3.0",
@@ -45578,7 +44632,7 @@
         "jsonwebtoken": "^9.0.2",
         "klona": "^2.0.6",
         "librechat-data-provider": "*",
-        "lodash": "^4.17.21",
+        "lodash": "^4.17.23",
         "meilisearch": "^0.38.0",
         "mongoose": "^8.12.1",
         "nanoid": "^3.3.7",
diff --git a/package.json b/package.json
index 011551594c..ecfb1d601f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,8 @@
 {
   "name": "LibreChat",
-  "version": "v0.8.2-rc2",
+  "version": "v0.8.2",
   "description": "",
+  "packageManager": "npm@11.10.0",
   "workspaces": [
     "api",
     "client",
@@ -15,6 +16,7 @@
     "user-stats": "node config/user-stats.js",
     "rebuild:package-lock": "node config/packages",
     "reinstall": "node config/update.js -l -g",
+    "smart-reinstall": "node config/smart-reinstall.js",
     "b:reinstall": "bun config/update.js -b -l -g",
     "reinstall:docker": "node config/update.js -d -g",
     "update:local": "node config/update.js -l",
@@ -128,11 +130,22 @@
     "lint-staged": "^15.4.3",
     "prettier": "^3.5.0",
     "prettier-plugin-tailwindcss": "^0.6.11",
+    "turbo": "^2.8.7",
     "typescript-eslint": "^8.24.0"
   },
   "overrides": {
+    "@anthropic-ai/sdk": "0.73.0",
+    "@librechat/agents": {
+      "@langchain/anthropic": {
+        "@anthropic-ai/sdk": "0.73.0",
+        "fast-xml-parser": "5.3.6"
+      },
+      "@anthropic-ai/sdk": "0.73.0",
+      "fast-xml-parser": "5.3.6"
+    },
     "axios": "1.12.1",
     "elliptic": "^6.6.1",
+    "fast-xml-parser": "5.3.6",
     "form-data": "^4.0.4",
     "tslib": "^2.8.1",
     "mdast-util-gfm-autolink-literal": "2.0.0",
@@ -150,7 +163,8 @@
       "micromark-extension-math": {
         "katex": "^0.16.21"
       }
-    }
+    },
+    "langsmith": "0.4.12"
   },
   "nodemonConfig": {
     "ignore": [
diff --git a/packages/api/jest.config.mjs b/packages/api/jest.config.mjs
index 10fa4554e4..5506d6e483 100644
--- a/packages/api/jest.config.mjs
+++ b/packages/api/jest.config.mjs
@@ -10,6 +10,17 @@ export default {
   ],
   coverageReporters: ['text', 'cobertura'],
   testResultsProcessor: 'jest-junit',
+  transform: {
+    '\\.[jt]sx?$': [
+      'babel-jest',
+      {
+        presets: [
+          ['@babel/preset-env', { targets: { node: 'current' } }],
+          '@babel/preset-typescript',
+        ],
+      },
+    ],
+  },
   moduleNameMapper: {
     '^@src/(.*)$': '<rootDir>/src/$1',
     '~/(.*)': '<rootDir>/src/$1',
diff --git a/packages/api/package.json b/packages/api/package.json
index 5f5576e293..107a660315 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@librechat/api",
-  "version": "1.7.20",
+  "version": "1.7.22",
   "type": "commonjs",
   "description": "MCP services for LibreChat",
   "main": "dist/index.js",
@@ -55,7 +55,6 @@
     "@rollup/plugin-replace": "^5.0.5",
     "@rollup/plugin-typescript": "^12.1.2",
     "@types/bun": "^1.2.15",
-    "@types/diff": "^6.0.0",
     "@types/express": "^5.0.0",
     "@types/express-session": "^1.18.2",
     "@types/jest": "^29.5.2",
@@ -79,22 +78,21 @@
     "registry": "https://registry.npmjs.org/"
   },
   "peerDependencies": {
-    "@anthropic-ai/vertex-sdk": "^0.14.0",
-    "@aws-sdk/client-bedrock-runtime": "^3.941.0",
-    "@aws-sdk/client-s3": "^3.758.0",
+    "@anthropic-ai/vertex-sdk": "^0.14.3",
+    "@aws-sdk/client-bedrock-runtime": "^3.970.0",
+    "@aws-sdk/client-s3": "^3.980.0",
     "@azure/identity": "^4.7.0",
     "@azure/search-documents": "^12.0.0",
-    "@azure/storage-blob": "^12.27.0",
+    "@azure/storage-blob": "^12.30.0",
     "@google/genai": "^1.19.0",
     "@keyv/redis": "^4.3.3",
     "@langchain/core": "^0.3.80",
-    "@librechat/agents": "^3.0.77",
+    "@librechat/agents": "^3.1.50",
     "@librechat/data-schemas": "*",
-    "@modelcontextprotocol/sdk": "^1.25.2",
+    "@modelcontextprotocol/sdk": "^1.26.0",
     "@smithy/node-http-handler": "^4.4.5",
-    "axios": "^1.12.1",
+    "axios": "^1.13.5",
     "connect-redis": "^8.1.0",
-    "diff": "^7.0.0",
     "eventsource": "^3.0.2",
     "express": "^5.1.0",
     "express-session": "^1.18.2",
@@ -114,7 +112,7 @@
     "node-fetch": "2.7.0",
     "rate-limit-redis": "^4.2.0",
     "tiktoken": "^1.0.15",
-    "undici": "^7.10.0",
+    "undici": "^7.18.2",
     "zod": "^3.22.4"
   }
 }
diff --git a/packages/api/src/agents/__tests__/initialize.test.ts b/packages/api/src/agents/__tests__/initialize.test.ts
new file mode 100644
index 0000000000..01310a09c4
--- /dev/null
+++ b/packages/api/src/agents/__tests__/initialize.test.ts
@@ -0,0 +1,284 @@
+import { Providers } from '@librechat/agents';
+import { EModelEndpoint } from 'librechat-data-provider';
+import type { Agent } from 'librechat-data-provider';
+import type { ServerRequest, InitializeResultBase } from '~/types';
+import type { InitializeAgentDbMethods } from '../initialize';
+
+// Mock logger
+jest.mock('winston', () => ({
+  createLogger: jest.fn(() => ({
+    debug: jest.fn(),
+    warn: jest.fn(),
+    error: jest.fn(),
+  })),
+  format: {
+    combine: jest.fn(),
+    colorize: jest.fn(),
+    simple: jest.fn(),
+  },
+  transports: {
+    Console: jest.fn(),
+  },
+}));
+
+const mockExtractLibreChatParams = jest.fn();
+const mockGetModelMaxTokens = jest.fn();
+const mockOptionalChainWithEmptyCheck = jest.fn();
+const mockGetThreadData = jest.fn();
+
+jest.mock('~/utils', () => ({
+  extractLibreChatParams: (...args: unknown[]) => mockExtractLibreChatParams(...args),
+  getModelMaxTokens: (...args: unknown[]) => mockGetModelMaxTokens(...args),
+  optionalChainWithEmptyCheck: (...args: unknown[]) => mockOptionalChainWithEmptyCheck(...args),
+  getThreadData: (...args: unknown[]) => mockGetThreadData(...args),
+}));
+
+const mockGetProviderConfig = jest.fn();
+jest.mock('~/endpoints', () => ({
+  getProviderConfig: (...args: unknown[]) => mockGetProviderConfig(...args),
+}));
+
+jest.mock('~/files', () => ({
+  filterFilesByEndpointConfig: jest.fn(() => []),
+}));
+
+jest.mock('~/prompts', () => ({
+  generateArtifactsPrompt: jest.fn(() => null),
+}));
+
+jest.mock('../resources', () => ({
+  primeResources: jest.fn().mockResolvedValue({
+    attachments: [],
+    tool_resources: undefined,
+  }),
+}));
+
+import { initializeAgent } from '../initialize';
+
+/**
+ * Creates minimal mock objects for initializeAgent tests.
+ */
+function createMocks(overrides?: {
+  maxContextTokens?: number;
+  modelDefault?: number;
+  maxOutputTokens?: number;
+}) {
+  const { maxContextTokens, modelDefault = 200000, maxOutputTokens = 4096 } = overrides ?? {};
+
+  const agent = {
+    id: 'agent-1',
+    model: 'test-model',
+    provider: Providers.OPENAI,
+    tools: [],
+    model_parameters: { model: 'test-model' },
+  } as unknown as Agent;
+
+  const req = {
+    user: { id: 'user-1' },
+    config: {},
+  } as unknown as ServerRequest;
+
+  const res = {} as unknown as import('express').Response;
+
+  const mockGetOptions = jest.fn().mockResolvedValue({
+    llmConfig: {
+      model: 'test-model',
+      maxTokens: maxOutputTokens,
+    },
+    endpointTokenConfig: undefined,
+  } satisfies InitializeResultBase);
+
+  mockGetProviderConfig.mockReturnValue({
+    getOptions: mockGetOptions,
+    overrideProvider: Providers.OPENAI,
+  });
+
+  // extractLibreChatParams returns maxContextTokens when provided in model_parameters
+  mockExtractLibreChatParams.mockReturnValue({
+    resendFiles: false,
+    maxContextTokens,
+    modelOptions: { model: 'test-model' },
+  });
+
+  // getModelMaxTokens returns the model's default context window
+  mockGetModelMaxTokens.mockReturnValue(modelDefault);
+
+  // Implement real optionalChainWithEmptyCheck behavior
+  mockOptionalChainWithEmptyCheck.mockImplementation(
+    (...values: (string | number | undefined)[]) => {
+      for (const v of values) {
+        if (v !== undefined && v !== null && v !== '') {
+          return v;
+        }
+      }
+      return values[values.length - 1];
+    },
+  );
+
+  const loadTools = jest.fn().mockResolvedValue({
+    tools: [],
+    toolContextMap: {},
+    userMCPAuthMap: undefined,
+    toolRegistry: undefined,
+    toolDefinitions: [],
+    hasDeferredTools: false,
+  });
+
+  const db: InitializeAgentDbMethods = {
+    getFiles: jest.fn().mockResolvedValue([]),
+    getConvoFiles: jest.fn().mockResolvedValue([]),
+    updateFilesUsage: jest.fn().mockResolvedValue([]),
+    getUserKey: jest.fn().mockResolvedValue('user-1'),
+    getUserKeyValues: jest.fn().mockResolvedValue([]),
+    getToolFilesByIds: jest.fn().mockResolvedValue([]),
+  };
+
+  return { agent, req, res, loadTools, db };
+}
+
+describe('initializeAgent — maxContextTokens', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('uses user-configured maxContextTokens when provided via model_parameters', async () => {
+    const userValue = 50000;
+    const { agent, req, res, loadTools, db } = createMocks({
+      maxContextTokens: userValue,
+      modelDefault: 200000,
+      maxOutputTokens: 4096,
+    });
+
+    const result = await initializeAgent(
+      {
+        req,
+        res,
+        agent,
+        loadTools,
+        endpointOption: {
+          endpoint: EModelEndpoint.agents,
+          model_parameters: { maxContextTokens: userValue },
+        },
+        allowedProviders: new Set([Providers.OPENAI]),
+        isInitialAgent: true,
+      },
+      db,
+    );
+
+    expect(result.maxContextTokens).toBe(userValue);
+  });
+
+  it('falls back to formula when maxContextTokens is NOT provided', async () => {
+    const modelDefault = 200000;
+    const maxOutputTokens = 4096;
+    const { agent, req, res, loadTools, db } = createMocks({
+      maxContextTokens: undefined,
+      modelDefault,
+      maxOutputTokens,
+    });
+
+    const result = await initializeAgent(
+      {
+        req,
+        res,
+        agent,
+        loadTools,
+        endpointOption: { endpoint: EModelEndpoint.agents },
+        allowedProviders: new Set([Providers.OPENAI]),
+        isInitialAgent: true,
+      },
+      db,
+    );
+
+    const expected = Math.round((modelDefault - maxOutputTokens) * 0.9);
+    expect(result.maxContextTokens).toBe(expected);
+  });
+
+  it('falls back to formula when maxContextTokens is 0', async () => {
+    const maxOutputTokens = 4096;
+    const { agent, req, res, loadTools, db } = createMocks({
+      maxContextTokens: 0,
+      modelDefault: 200000,
+      maxOutputTokens,
+    });
+
+    const result = await initializeAgent(
+      {
+        req,
+        res,
+        agent,
+        loadTools,
+        endpointOption: {
+          endpoint: EModelEndpoint.agents,
+          model_parameters: { maxContextTokens: 0 },
+        },
+        allowedProviders: new Set([Providers.OPENAI]),
+        isInitialAgent: true,
+      },
+      db,
+    );
+
+    // 0 is not used as-is; the formula kicks in.
+    // optionalChainWithEmptyCheck(0, 200000, 18000) returns 0 (not null/undefined),
+    // then Number(0) || 18000 = 18000 (the fallback default).
+    expect(result.maxContextTokens).not.toBe(0);
+    const expected = Math.round((18000 - maxOutputTokens) * 0.9);
+    expect(result.maxContextTokens).toBe(expected);
+  });
+
+  it('falls back to formula when maxContextTokens is negative', async () => {
+    const maxOutputTokens = 4096;
+    const { agent, req, res, loadTools, db } = createMocks({
+      maxContextTokens: -1,
+      modelDefault: 200000,
+      maxOutputTokens,
+    });
+
+    const result = await initializeAgent(
+      {
+        req,
+        res,
+        agent,
+        loadTools,
+        endpointOption: {
+          endpoint: EModelEndpoint.agents,
+          model_parameters: { maxContextTokens: -1 },
+        },
+        allowedProviders: new Set([Providers.OPENAI]),
+        isInitialAgent: true,
+      },
+      db,
+    );
+
+    // -1 is not used as-is; the formula kicks in
+    expect(result.maxContextTokens).not.toBe(-1);
+  });
+
+  it('preserves small user-configured value (e.g. 1000 from modelSpec)', async () => {
+    const userValue = 1000;
+    const { agent, req, res, loadTools, db } = createMocks({
+      maxContextTokens: userValue,
+      modelDefault: 128000,
+      maxOutputTokens: 4096,
+    });
+
+    const result = await initializeAgent(
+      {
+        req,
+        res,
+        agent,
+        loadTools,
+        endpointOption: {
+          endpoint: EModelEndpoint.agents,
+          model_parameters: { maxContextTokens: userValue },
+        },
+        allowedProviders: new Set([Providers.OPENAI]),
+        isInitialAgent: true,
+      },
+      db,
+    );
+
+    // Should NOT be overridden to Math.round((128000 - 4096) * 0.9) = 111,514
+    expect(result.maxContextTokens).toBe(userValue);
+  });
+});
diff --git a/packages/api/src/agents/client.ts b/packages/api/src/agents/client.ts
new file mode 100644
index 0000000000..fd5d50f211
--- /dev/null
+++ b/packages/api/src/agents/client.ts
@@ -0,0 +1,162 @@
+import { logger } from '@librechat/data-schemas';
+import { isAgentsEndpoint } from 'librechat-data-provider';
+import { labelContentByAgent, getTokenCountForMessage } from '@librechat/agents';
+import type { MessageContentComplex } from '@librechat/agents';
+import type { Agent, TMessage } from 'librechat-data-provider';
+import type { BaseMessage } from '@langchain/core/messages';
+import type { ServerRequest } from '~/types';
+import Tokenizer from '~/utils/tokenizer';
+import { logAxiosError } from '~/utils';
+
+export const omitTitleOptions = new Set([
+  'stream',
+  'thinking',
+  'streaming',
+  'clientOptions',
+  'thinkingConfig',
+  'thinkingBudget',
+  'includeThoughts',
+  'maxOutputTokens',
+  'additionalModelRequestFields',
+]);
+
+export function payloadParser({ req, endpoint }: { req: ServerRequest; endpoint: string }) {
+  if (isAgentsEndpoint(endpoint)) {
+    return;
+  }
+  return req.body?.endpointOption?.model_parameters;
+}
+
+export function createTokenCounter(encoding: Parameters<typeof Tokenizer.getTokenCount>[1]) {
+  return function (message: BaseMessage) {
+    const countTokens = (text: string) => Tokenizer.getTokenCount(text, encoding);
+    return getTokenCountForMessage(message, countTokens);
+  };
+}
+
+export function logToolError(_graph: unknown, error: unknown, toolId: string) {
+  logAxiosError({
+    error,
+    message: `[api/server/controllers/agents/client.js #chatCompletion] Tool Error "${toolId}"`,
+  });
+}
+
+const AGENT_SUFFIX_PATTERN = /____(\d+)$/;
+
+/** Finds the primary agent ID within a set of agent IDs (no suffix or lowest suffix number) */
+export function findPrimaryAgentId(agentIds: Set<string>): string | null {
+  let primaryAgentId: string | null = null;
+  let lowestSuffixIndex = Infinity;
+
+  for (const agentId of agentIds) {
+    const suffixMatch = agentId.match(AGENT_SUFFIX_PATTERN);
+    if (!suffixMatch) {
+      return agentId;
+    }
+    const suffixIndex = parseInt(suffixMatch[1], 10);
+    if (suffixIndex < lowestSuffixIndex) {
+      lowestSuffixIndex = suffixIndex;
+      primaryAgentId = agentId;
+    }
+  }
+
+  return primaryAgentId;
+}
+
+type ContentPart = TMessage['content'] extends (infer U)[] | undefined ? U : never;
+
+/**
+ * Creates a mapMethod for getMessagesForConversation that processes agent content.
+ * - Strips agentId/groupId metadata from all content
+ * - For parallel agents (addedConvo with groupId): filters each group to its primary agent
+ * - For handoffs (agentId without groupId): keeps all content from all agents
+ * - For multi-agent: applies agent labels to content
+ *
+ * The key distinction:
+ * - Parallel execution (addedConvo): Parts have both agentId AND groupId
+ * - Handoffs: Parts only have agentId, no groupId
+ */
+export function createMultiAgentMapper(primaryAgent: Agent, agentConfigs?: Map<string, Agent>) {
+  const hasMultipleAgents = (primaryAgent.edges?.length ?? 0) > 0 || (agentConfigs?.size ?? 0) > 0;
+
+  let agentNames: Record<string, string> | null = null;
+  if (hasMultipleAgents) {
+    agentNames = { [primaryAgent.id]: primaryAgent.name || 'Assistant' };
+    if (agentConfigs) {
+      for (const [agentId, agentConfig] of agentConfigs.entries()) {
+        agentNames[agentId] = agentConfig.name || agentConfig.id;
+      }
+    }
+  }
+
+  return (message: TMessage): TMessage => {
+    if (message.isCreatedByUser || !Array.isArray(message.content)) {
+      return message;
+    }
+
+    const hasAgentMetadata = message.content.some(
+      (part) =>
+        (part as ContentPart & { agentId?: string; groupId?: number })?.agentId ||
+        (part as ContentPart & { groupId?: number })?.groupId != null,
+    );
+    if (!hasAgentMetadata) {
+      return message;
+    }
+
+    try {
+      const groupAgentMap = new Map<number, Set<string>>();
+
+      for (const part of message.content) {
+        const p = part as ContentPart & { agentId?: string; groupId?: number };
+        const groupId = p?.groupId;
+        const agentId = p?.agentId;
+        if (groupId != null && agentId) {
+          if (!groupAgentMap.has(groupId)) {
+            groupAgentMap.set(groupId, new Set());
+          }
+          groupAgentMap.get(groupId)!.add(agentId);
+        }
+      }
+
+      const groupPrimaryMap = new Map<number, string>();
+      for (const [groupId, agentIds] of groupAgentMap) {
+        const primary = findPrimaryAgentId(agentIds);
+        if (primary) {
+          groupPrimaryMap.set(groupId, primary);
+        }
+      }
+
+      const filteredContent: ContentPart[] = [];
+      const agentIdMap: Record<number, string> = {};
+
+      for (const part of message.content) {
+        const p = part as ContentPart & { agentId?: string; groupId?: number };
+        const agentId = p?.agentId;
+        const groupId = p?.groupId;
+
+        const isParallelPart = groupId != null;
+        const groupPrimary = isParallelPart ? groupPrimaryMap.get(groupId) : null;
+        const shouldInclude = !isParallelPart || !agentId || agentId === groupPrimary;
+
+        if (shouldInclude) {
+          const newIndex = filteredContent.length;
+          const { agentId: _a, groupId: _g, ...cleanPart } = p;
+          filteredContent.push(cleanPart as ContentPart);
+          if (agentId && hasMultipleAgents) {
+            agentIdMap[newIndex] = agentId;
+          }
+        }
+      }
+
+      const finalContent =
+        Object.keys(agentIdMap).length > 0 && agentNames
+          ? labelContentByAgent(filteredContent as MessageContentComplex[], agentIdMap, agentNames)
+          : filteredContent;
+
+      return { ...message, content: finalContent as TMessage['content'] };
+    } catch (error) {
+      logger.error('[AgentClient] Error processing multi-agent message:', error);
+      return message;
+    }
+  };
+}
diff --git a/packages/api/src/agents/context.spec.ts b/packages/api/src/agents/context.spec.ts
new file mode 100644
index 0000000000..c5358209c7
--- /dev/null
+++ b/packages/api/src/agents/context.spec.ts
@@ -0,0 +1,528 @@
+import { z } from 'zod';
+import { Constants } from 'librechat-data-provider';
+import { DynamicStructuredTool } from '@langchain/core/tools';
+import type { Logger } from 'winston';
+import type { MCPManager } from '~/mcp/MCPManager';
+import {
+  extractMCPServers,
+  getMCPInstructionsForServers,
+  buildAgentInstructions,
+  applyContextToAgent,
+} from './context';
+
+// Test schema for DynamicStructuredTool
+const testSchema = z.object({});
+
+describe('Agent Context Utilities', () => {
+  describe('extractMCPServers', () => {
+    it('should return empty array when agent has no tools', () => {
+      const agent = { id: 'test-agent' };
+      expect(extractMCPServers(agent)).toEqual([]);
+    });
+
+    it('should return empty array when agent tools array is empty', () => {
+      const agent = { id: 'test-agent', tools: [] };
+      expect(extractMCPServers(agent)).toEqual([]);
+    });
+
+    it('should extract unique MCP server names from tools', () => {
+      const tool1 = new DynamicStructuredTool({
+        name: `tool1${Constants.mcp_delimiter}server1`,
+        description: 'Test tool 1',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const tool2 = new DynamicStructuredTool({
+        name: `tool2${Constants.mcp_delimiter}server2`,
+        description: 'Test tool 2',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const agent = { id: 'test-agent', tools: [tool1, tool2] };
+      const result = extractMCPServers(agent);
+
+      expect(result).toContain('server1');
+      expect(result).toContain('server2');
+      expect(result).toHaveLength(2);
+    });
+
+    it('should return unique server names when multiple tools use same server', () => {
+      const tool1 = new DynamicStructuredTool({
+        name: `tool1${Constants.mcp_delimiter}server1`,
+        description: 'Test tool 1',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const tool2 = new DynamicStructuredTool({
+        name: `tool2${Constants.mcp_delimiter}server1`,
+        description: 'Test tool 2',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const agent = { id: 'test-agent', tools: [tool1, tool2] };
+      const result = extractMCPServers(agent);
+
+      expect(result).toEqual(['server1']);
+      expect(result).toHaveLength(1);
+    });
+
+    it('should ignore tools without MCP delimiter', () => {
+      const mcpTool = new DynamicStructuredTool({
+        name: `tool1${Constants.mcp_delimiter}server1`,
+        description: 'MCP tool',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const regularTool = new DynamicStructuredTool({
+        name: 'regular_tool',
+        description: 'Regular tool',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const agent = { id: 'test-agent', tools: [mcpTool, regularTool] };
+      const result = extractMCPServers(agent);
+
+      expect(result).toEqual(['server1']);
+      expect(result).toHaveLength(1);
+    });
+
+    it('should handle mixed tool types (string and DynamicStructuredTool)', () => {
+      const mcpTool = new DynamicStructuredTool({
+        name: `tool1${Constants.mcp_delimiter}server1`,
+        description: 'MCP tool',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const agent = { id: 'test-agent', tools: [mcpTool, 'string-tool'] };
+      const result = extractMCPServers(agent);
+
+      expect(result).toEqual(['server1']);
+    });
+
+    it('should filter out empty server names', () => {
+      const toolWithEmptyServer = new DynamicStructuredTool({
+        name: `tool1${Constants.mcp_delimiter}`,
+        description: 'Tool with empty server',
+        schema: testSchema,
+        func: async () => 'result',
+      });
+
+      const agent = { id: 'test-agent', tools: [toolWithEmptyServer] };
+      const result = extractMCPServers(agent);
+
+      expect(result).toEqual([]);
+    });
+  });
+
+  describe('getMCPInstructionsForServers', () => {
+    let mockMCPManager: jest.Mocked<MCPManager>;
+    let mockLogger: Logger;
+
+    beforeEach(() => {
+      mockMCPManager = {
+        formatInstructionsForContext: jest.fn(),
+      } as unknown as jest.Mocked<MCPManager>;
+
+      mockLogger = {
+        debug: jest.fn(),
+        error: jest.fn(),
+      } as unknown as Logger;
+    });
+
+    it('should return empty string when server array is empty', async () => {
+      const result = await getMCPInstructionsForServers([], mockMCPManager, mockLogger);
+
+      expect(result).toBe('');
+      expect(mockMCPManager.formatInstructionsForContext).not.toHaveBeenCalled();
+    });
+
+    it('should fetch and return MCP instructions successfully', async () => {
+      const instructions = '# MCP Instructions\nUse these tools carefully';
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue(instructions);
+
+      const result = await getMCPInstructionsForServers(
+        ['server1', 'server2'],
+        mockMCPManager,
+        mockLogger,
+      );
+
+      expect(result).toBe(instructions);
+      expect(mockMCPManager.formatInstructionsForContext).toHaveBeenCalledWith([
+        'server1',
+        'server2',
+      ]);
+      expect(mockLogger.debug).toHaveBeenCalledWith(
+        '[AgentContext] Fetched MCP instructions for servers:',
+        ['server1', 'server2'],
+      );
+    });
+
+    it('should return empty string when MCP manager returns empty', async () => {
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('');
+
+      const result = await getMCPInstructionsForServers(['server1'], mockMCPManager, mockLogger);
+
+      expect(result).toBe('');
+      expect(mockLogger.debug).not.toHaveBeenCalled();
+    });
+
+    it('should handle errors gracefully and log them', async () => {
+      const error = new Error('MCP fetch failed');
+      mockMCPManager.formatInstructionsForContext.mockRejectedValue(error);
+
+      const result = await getMCPInstructionsForServers(['server1'], mockMCPManager, mockLogger);
+
+      expect(result).toBe('');
+      expect(mockLogger.error).toHaveBeenCalledWith(
+        '[AgentContext] Failed to get MCP instructions:',
+        error,
+      );
+    });
+
+    it('should work without logger', async () => {
+      const instructions = 'Test instructions';
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue(instructions);
+
+      const result = await getMCPInstructionsForServers(['server1'], mockMCPManager);
+
+      expect(result).toBe(instructions);
+      // Should not throw even without logger
+    });
+
+    it('should handle errors without logger', async () => {
+      mockMCPManager.formatInstructionsForContext.mockRejectedValue(new Error('Test error'));
+
+      const result = await getMCPInstructionsForServers(['server1'], mockMCPManager);
+
+      expect(result).toBe('');
+      // Should not throw even without logger
+    });
+  });
+
+  describe('buildAgentInstructions', () => {
+    it('should combine all parts with double newlines', () => {
+      const result = buildAgentInstructions({
+        sharedRunContext: 'Shared context',
+        baseInstructions: 'Base instructions',
+        mcpInstructions: 'MCP instructions',
+      });
+
+      expect(result).toBe('Shared context\n\nBase instructions\n\nMCP instructions');
+    });
+
+    it('should filter out empty parts', () => {
+      const result = buildAgentInstructions({
+        sharedRunContext: 'Shared context',
+        baseInstructions: '',
+        mcpInstructions: 'MCP instructions',
+      });
+
+      expect(result).toBe('Shared context\n\nMCP instructions');
+    });
+
+    it('should return undefined when all parts are empty', () => {
+      const result = buildAgentInstructions({
+        sharedRunContext: '',
+        baseInstructions: '',
+        mcpInstructions: '',
+      });
+
+      expect(result).toBeUndefined();
+    });
+
+    it('should handle only shared context', () => {
+      const result = buildAgentInstructions({
+        sharedRunContext: 'Shared context only',
+      });
+
+      expect(result).toBe('Shared context only');
+    });
+
+    it('should handle only base instructions', () => {
+      const result = buildAgentInstructions({
+        baseInstructions: 'Base instructions only',
+      });
+
+      expect(result).toBe('Base instructions only');
+    });
+
+    it('should handle only MCP instructions', () => {
+      const result = buildAgentInstructions({
+        mcpInstructions: 'MCP instructions only',
+      });
+
+      expect(result).toBe('MCP instructions only');
+    });
+
+    it('should trim whitespace from combined result', () => {
+      const result = buildAgentInstructions({
+        sharedRunContext: '  Shared context  ',
+        baseInstructions: '  Base instructions  ',
+      });
+
+      expect(result).toBe('Shared context  \n\n  Base instructions');
+    });
+
+    it('should handle undefined parts', () => {
+      const result = buildAgentInstructions({
+        sharedRunContext: undefined,
+        baseInstructions: 'Base',
+        mcpInstructions: undefined,
+      });
+
+      expect(result).toBe('Base');
+    });
+  });
+
+  describe('applyContextToAgent', () => {
+    let mockMCPManager: jest.Mocked<MCPManager>;
+    let mockLogger: Logger;
+
+    beforeEach(() => {
+      mockMCPManager = {
+        formatInstructionsForContext: jest.fn(),
+      } as unknown as jest.Mocked<MCPManager>;
+
+      mockLogger = {
+        debug: jest.fn(),
+        error: jest.fn(),
+      } as unknown as Logger;
+    });
+
+    it('should apply context successfully with all components', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: 'Original instructions',
+        tools: [
+          new DynamicStructuredTool({
+            name: `tool${Constants.mcp_delimiter}server1`,
+            description: 'Test tool',
+            schema: testSchema,
+            func: async () => 'result',
+          }),
+        ],
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('MCP instructions');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Shared context',
+        mcpManager: mockMCPManager,
+        agentId: 'test-agent',
+        logger: mockLogger,
+      });
+
+      expect(agent.instructions).toBe(
+        'Shared context\n\nOriginal instructions\n\nMCP instructions',
+      );
+      expect(mockLogger.debug).toHaveBeenCalledWith(
+        '[AgentContext] Applied context to agent: test-agent',
+      );
+    });
+
+    it('should use ephemeral agent MCP servers when provided', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: 'Base instructions',
+        tools: [],
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('Ephemeral MCP');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Context',
+        mcpManager: mockMCPManager,
+        ephemeralAgent: { mcp: ['ephemeral-server'] },
+        logger: mockLogger,
+      });
+
+      expect(mockMCPManager.formatInstructionsForContext).toHaveBeenCalledWith([
+        'ephemeral-server',
+      ]);
+      expect(agent.instructions).toContain('Ephemeral MCP');
+    });
+
+    it('should prefer agent tools over empty ephemeral MCP array', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: 'Base',
+        tools: [
+          new DynamicStructuredTool({
+            name: `tool${Constants.mcp_delimiter}agent-server`,
+            description: 'Test tool',
+            schema: testSchema,
+            func: async () => 'result',
+          }),
+        ],
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('Agent MCP');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: '',
+        mcpManager: mockMCPManager,
+        ephemeralAgent: { mcp: [] },
+        logger: mockLogger,
+      });
+
+      expect(mockMCPManager.formatInstructionsForContext).toHaveBeenCalledWith(['agent-server']);
+    });
+
+    it('should work without agentId', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: 'Base',
+        tools: [],
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Context',
+        mcpManager: mockMCPManager,
+        logger: mockLogger,
+      });
+
+      expect(agent.instructions).toBe('Context\n\nBase');
+      expect(mockLogger.debug).not.toHaveBeenCalled();
+    });
+
+    it('should work without logger', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: 'Base',
+        tools: [
+          new DynamicStructuredTool({
+            name: `tool${Constants.mcp_delimiter}server1`,
+            description: 'Test tool',
+            schema: testSchema,
+            func: async () => 'result',
+          }),
+        ],
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('MCP');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Context',
+        mcpManager: mockMCPManager,
+      });
+
+      expect(agent.instructions).toBe('Context\n\nBase\n\nMCP');
+    });
+
+    it('should handle MCP fetch error gracefully and set fallback instructions', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: 'Base instructions',
+        tools: [
+          new DynamicStructuredTool({
+            name: `tool${Constants.mcp_delimiter}server1`,
+            description: 'Test tool',
+            schema: testSchema,
+            func: async () => 'result',
+          }),
+        ],
+      };
+
+      const error = new Error('MCP fetch failed');
+      mockMCPManager.formatInstructionsForContext.mockRejectedValue(error);
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Shared context',
+        mcpManager: mockMCPManager,
+        agentId: 'test-agent',
+        logger: mockLogger,
+      });
+
+      // getMCPInstructionsForServers catches the error and returns empty string
+      // So agent still has shared context + base instructions (without MCP)
+      expect(agent.instructions).toBe('Shared context\n\nBase instructions');
+      // Error is logged by getMCPInstructionsForServers, not applyContextToAgent
+      expect(mockLogger.error).toHaveBeenCalledWith(
+        '[AgentContext] Failed to get MCP instructions:',
+        error,
+      );
+    });
+
+    it('should handle invalid tools gracefully without throwing', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: 'Base',
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        tools: null as any, // Invalid tools - should not crash
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Context',
+        mcpManager: mockMCPManager,
+        logger: mockLogger,
+      });
+
+      // extractMCPServers handles null tools gracefully, returns []
+      // getMCPInstructionsForServers returns early with '', so no MCP instructions
+      // Agent should still have shared context + base instructions
+      expect(agent.instructions).toBe('Context\n\nBase');
+      expect(mockMCPManager.formatInstructionsForContext).not.toHaveBeenCalled();
+    });
+
+    it('should preserve empty base instructions', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: '',
+        tools: [
+          new DynamicStructuredTool({
+            name: `tool${Constants.mcp_delimiter}server1`,
+            description: 'Test tool',
+            schema: testSchema,
+            func: async () => 'result',
+          }),
+        ],
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('MCP only');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Shared',
+        mcpManager: mockMCPManager,
+      });
+
+      expect(agent.instructions).toBe('Shared\n\nMCP only');
+    });
+
+    it('should handle missing instructions field on agent', async () => {
+      const agent = {
+        id: 'test-agent',
+        instructions: undefined,
+        tools: [],
+      };
+
+      mockMCPManager.formatInstructionsForContext.mockResolvedValue('');
+
+      await applyContextToAgent({
+        agent,
+        sharedRunContext: 'Context',
+        mcpManager: mockMCPManager,
+      });
+
+      expect(agent.instructions).toBe('Context');
+    });
+  });
+});
diff --git a/packages/api/src/agents/context.ts b/packages/api/src/agents/context.ts
new file mode 100644
index 0000000000..ebae2e0f9f
--- /dev/null
+++ b/packages/api/src/agents/context.ts
@@ -0,0 +1,165 @@
+import { DynamicStructuredTool } from '@langchain/core/tools';
+import { Constants } from 'librechat-data-provider';
+import type { Agent, TEphemeralAgent } from 'librechat-data-provider';
+import type { LCTool } from '@librechat/agents';
+import type { Logger } from 'winston';
+import type { MCPManager } from '~/mcp/MCPManager';
+
+/**
+ * Agent type with optional tools array that can contain DynamicStructuredTool or string.
+ * For context operations, we only require id and instructions, other Agent fields are optional.
+ */
+export type AgentWithTools = Pick<Agent, 'id'> &
+  Partial<Omit<Agent, 'id' | 'tools'>> & {
+    tools?: Array<DynamicStructuredTool | string>;
+    /** Serializable tool definitions for event-driven mode */
+    toolDefinitions?: LCTool[];
+  };
+
+/**
+ * Extracts unique MCP server names from an agent's tools or tool definitions.
+ * Supports both full tool instances (tools) and serializable definitions (toolDefinitions).
+ * @param agent - The agent with tools and/or tool definitions
+ * @returns Array of unique MCP server names
+ */
+export function extractMCPServers(agent: AgentWithTools): string[] {
+  const mcpServers = new Set<string>();
+
+  /** Check tool instances (non-event-driven mode) */
+  if (agent?.tools?.length) {
+    for (const tool of agent.tools) {
+      if (tool instanceof DynamicStructuredTool && tool.name.includes(Constants.mcp_delimiter)) {
+        const serverName = tool.name.split(Constants.mcp_delimiter).pop();
+        if (serverName) {
+          mcpServers.add(serverName);
+        }
+      }
+    }
+  }
+
+  /** Check tool definitions (event-driven mode) */
+  if (agent?.toolDefinitions?.length) {
+    for (const toolDef of agent.toolDefinitions) {
+      if (toolDef.name?.includes(Constants.mcp_delimiter)) {
+        const serverName = toolDef.name.split(Constants.mcp_delimiter).pop();
+        if (serverName) {
+          mcpServers.add(serverName);
+        }
+      }
+    }
+  }
+
+  return Array.from(mcpServers);
+}
+
+/**
+ * Fetches MCP instructions for the given server names.
+ * @param {string[]} mcpServers - Array of MCP server names
+ * @param {MCPManager} mcpManager - MCP manager instance
+ * @param {Logger} [logger] - Optional logger instance
+ * @returns {Promise<string>} MCP instructions string, empty if none
+ */
+export async function getMCPInstructionsForServers(
+  mcpServers: string[],
+  mcpManager: MCPManager,
+  logger?: Logger,
+): Promise<string> {
+  if (!mcpServers.length) {
+    return '';
+  }
+  try {
+    const mcpInstructions = await mcpManager.formatInstructionsForContext(mcpServers);
+    if (mcpInstructions && logger) {
+      logger.debug('[AgentContext] Fetched MCP instructions for servers:', mcpServers);
+    }
+    return mcpInstructions || '';
+  } catch (error) {
+    if (logger) {
+      logger.error('[AgentContext] Failed to get MCP instructions:', error);
+    }
+    return '';
+  }
+}
+
+/**
+ * Builds final instructions for an agent by combining shared run context and agent-specific context.
+ * Order: sharedRunContext -> baseInstructions -> mcpInstructions
+ *
+ * @param {Object} params
+ * @param {string} [params.sharedRunContext] - Run-level context shared by all agents (file context, RAG, memory)
+ * @param {string} [params.baseInstructions] - Agent's base instructions
+ * @param {string} [params.mcpInstructions] - Agent's MCP server instructions
+ * @returns {string | undefined} Combined instructions, or undefined if empty
+ */
+export function buildAgentInstructions({
+  sharedRunContext,
+  baseInstructions,
+  mcpInstructions,
+}: {
+  sharedRunContext?: string;
+  baseInstructions?: string;
+  mcpInstructions?: string;
+}): string | undefined {
+  const parts = [sharedRunContext, baseInstructions, mcpInstructions].filter(Boolean);
+  const combined = parts.join('\n\n').trim();
+  return combined || undefined;
+}
+
+/**
+ * Applies run context and MCP instructions to an agent's configuration.
+ * Mutates the agent object in place.
+ *
+ * @param {Object} params
+ * @param {Agent} params.agent - The agent to update
+ * @param {string} params.sharedRunContext - Run-level shared context
+ * @param {MCPManager} params.mcpManager - MCP manager instance
+ * @param {Object} [params.ephemeralAgent] - Ephemeral agent config (for MCP override)
+ * @param {string} [params.agentId] - Agent ID for logging
+ * @param {Logger} [params.logger] - Optional logger instance
+ * @returns {Promise<void>}
+ */
+export async function applyContextToAgent({
+  agent,
+  sharedRunContext,
+  mcpManager,
+  ephemeralAgent,
+  agentId,
+  logger,
+}: {
+  agent: AgentWithTools;
+  sharedRunContext: string;
+  mcpManager: MCPManager;
+  ephemeralAgent?: TEphemeralAgent;
+  agentId?: string;
+  logger?: Logger;
+}): Promise<void> {
+  const baseInstructions = agent.instructions || '';
+
+  try {
+    const mcpServers = ephemeralAgent?.mcp?.length ? ephemeralAgent.mcp : extractMCPServers(agent);
+    const mcpInstructions = await getMCPInstructionsForServers(mcpServers, mcpManager, logger);
+
+    agent.instructions = buildAgentInstructions({
+      sharedRunContext,
+      baseInstructions,
+      mcpInstructions,
+    });
+
+    if (agentId && logger) {
+      logger.debug(`[AgentContext] Applied context to agent: ${agentId}`);
+    }
+  } catch (error) {
+    agent.instructions = buildAgentInstructions({
+      sharedRunContext,
+      baseInstructions,
+      mcpInstructions: '',
+    });
+
+    if (logger) {
+      logger.error(
+        `[AgentContext] Failed to apply context to agent${agentId ? ` ${agentId}` : ''}, using base instructions only:`,
+        error,
+      );
+    }
+  }
+}
diff --git a/packages/api/src/agents/handlers.spec.ts b/packages/api/src/agents/handlers.spec.ts
new file mode 100644
index 0000000000..5b8072f743
--- /dev/null
+++ b/packages/api/src/agents/handlers.spec.ts
@@ -0,0 +1,178 @@
+import { Constants } from '@librechat/agents';
+import type {
+  ToolExecuteBatchRequest,
+  ToolExecuteResult,
+  ToolCallRequest,
+} from '@librechat/agents';
+import { createToolExecuteHandler, ToolExecuteOptions } from './handlers';
+
+function createMockTool(name: string, capturedConfigs: Record<string, unknown>[]) {
+  return {
+    name,
+    invoke: jest.fn(async (_args: unknown, config: Record<string, unknown>) => {
+      capturedConfigs.push({ ...(config.toolCall as Record<string, unknown>) });
+      return {
+        content: `stdout:\n${name} executed\n`,
+        artifact: { session_id: `result-session-${name}`, files: [] },
+      };
+    }),
+  };
+}
+
+function createHandler(
+  capturedConfigs: Record<string, unknown>[],
+  toolNames: string[] = [Constants.EXECUTE_CODE],
+) {
+  const mockTools = toolNames.map((name) => createMockTool(name, capturedConfigs));
+  const loadTools: ToolExecuteOptions['loadTools'] = jest.fn(async () => ({
+    loadedTools: mockTools as never[],
+  }));
+  return createToolExecuteHandler({ loadTools });
+}
+
+function invokeHandler(
+  handler: ReturnType<typeof createToolExecuteHandler>,
+  toolCalls: ToolCallRequest[],
+): Promise<ToolExecuteResult[]> {
+  return new Promise((resolve, reject) => {
+    const request: ToolExecuteBatchRequest = {
+      toolCalls,
+      resolve,
+      reject,
+    };
+    handler.handle('on_tool_execute', request);
+  });
+}
+
+describe('createToolExecuteHandler', () => {
+  describe('code execution session context passthrough', () => {
+    it('passes session_id and _injected_files from codeSessionContext to toolCallConfig', async () => {
+      const capturedConfigs: Record<string, unknown>[] = [];
+      const handler = createHandler(capturedConfigs);
+
+      const toolCalls: ToolCallRequest[] = [
+        {
+          id: 'call_1',
+          name: Constants.EXECUTE_CODE,
+          args: { lang: 'python', code: 'print("hi")' },
+          codeSessionContext: {
+            session_id: 'prev-session-abc',
+            files: [
+              { session_id: 'prev-session-abc', id: 'f1', name: 'data.parquet' },
+              { session_id: 'prev-session-abc', id: 'f2', name: 'chart.png' },
+            ],
+          },
+        },
+      ];
+
+      await invokeHandler(handler, toolCalls);
+
+      expect(capturedConfigs).toHaveLength(1);
+      expect(capturedConfigs[0].session_id).toBe('prev-session-abc');
+      expect(capturedConfigs[0]._injected_files).toEqual([
+        { session_id: 'prev-session-abc', id: 'f1', name: 'data.parquet' },
+        { session_id: 'prev-session-abc', id: 'f2', name: 'chart.png' },
+      ]);
+    });
+
+    it('passes session_id without _injected_files when session has no files', async () => {
+      const capturedConfigs: Record<string, unknown>[] = [];
+      const handler = createHandler(capturedConfigs);
+
+      const toolCalls: ToolCallRequest[] = [
+        {
+          id: 'call_2',
+          name: Constants.EXECUTE_CODE,
+          args: { lang: 'python', code: 'import pandas' },
+          codeSessionContext: {
+            session_id: 'session-no-files',
+          },
+        },
+      ];
+
+      await invokeHandler(handler, toolCalls);
+
+      expect(capturedConfigs).toHaveLength(1);
+      expect(capturedConfigs[0].session_id).toBe('session-no-files');
+      expect(capturedConfigs[0]._injected_files).toBeUndefined();
+    });
+
+    it('does not inject session context when codeSessionContext is absent', async () => {
+      const capturedConfigs: Record<string, unknown>[] = [];
+      const handler = createHandler(capturedConfigs);
+
+      const toolCalls: ToolCallRequest[] = [
+        {
+          id: 'call_3',
+          name: Constants.EXECUTE_CODE,
+          args: { lang: 'python', code: 'x = 1' },
+        },
+      ];
+
+      await invokeHandler(handler, toolCalls);
+
+      expect(capturedConfigs).toHaveLength(1);
+      expect(capturedConfigs[0].session_id).toBeUndefined();
+      expect(capturedConfigs[0]._injected_files).toBeUndefined();
+    });
+
+    it('passes session context independently for multiple code execution calls', async () => {
+      const capturedConfigs: Record<string, unknown>[] = [];
+      const handler = createHandler(capturedConfigs);
+
+      const toolCalls: ToolCallRequest[] = [
+        {
+          id: 'call_a',
+          name: Constants.EXECUTE_CODE,
+          args: { lang: 'python', code: 'step_1()' },
+          codeSessionContext: {
+            session_id: 'session-A',
+            files: [{ session_id: 'session-A', id: 'fa', name: 'a.csv' }],
+          },
+        },
+        {
+          id: 'call_b',
+          name: Constants.EXECUTE_CODE,
+          args: { lang: 'python', code: 'step_2()' },
+          codeSessionContext: {
+            session_id: 'session-A',
+            files: [{ session_id: 'session-A', id: 'fa', name: 'a.csv' }],
+          },
+        },
+      ];
+
+      await invokeHandler(handler, toolCalls);
+
+      expect(capturedConfigs).toHaveLength(2);
+      for (const config of capturedConfigs) {
+        expect(config.session_id).toBe('session-A');
+        expect(config._injected_files).toEqual([
+          { session_id: 'session-A', id: 'fa', name: 'a.csv' },
+        ]);
+      }
+    });
+
+    it('does not pass session context to non-code-execution tools', async () => {
+      const capturedConfigs: Record<string, unknown>[] = [];
+      const handler = createHandler(capturedConfigs, ['web_search']);
+
+      const toolCalls: ToolCallRequest[] = [
+        {
+          id: 'call_ws',
+          name: 'web_search',
+          args: { query: 'test' },
+          codeSessionContext: {
+            session_id: 'should-be-ignored',
+            files: [{ session_id: 'x', id: 'y', name: 'z' }],
+          },
+        },
+      ];
+
+      await invokeHandler(handler, toolCalls);
+
+      expect(capturedConfigs).toHaveLength(1);
+      expect(capturedConfigs[0].session_id).toBeUndefined();
+      expect(capturedConfigs[0]._injected_files).toBeUndefined();
+    });
+  });
+});
diff --git a/packages/api/src/agents/handlers.ts b/packages/api/src/agents/handlers.ts
new file mode 100644
index 0000000000..62200b1a46
--- /dev/null
+++ b/packages/api/src/agents/handlers.ts
@@ -0,0 +1,179 @@
+import { logger } from '@librechat/data-schemas';
+import { GraphEvents, Constants } from '@librechat/agents';
+import type {
+  LCTool,
+  EventHandler,
+  LCToolRegistry,
+  ToolCallRequest,
+  ToolExecuteResult,
+  ToolExecuteBatchRequest,
+} from '@librechat/agents';
+import type { StructuredToolInterface } from '@langchain/core/tools';
+
+export interface ToolEndCallbackData {
+  output: {
+    name: string;
+    tool_call_id: string;
+    content: string | unknown;
+    artifact?: unknown;
+  };
+}
+
+export interface ToolEndCallbackMetadata {
+  run_id?: string;
+  thread_id?: string;
+  [key: string]: unknown;
+}
+
+export type ToolEndCallback = (
+  data: ToolEndCallbackData,
+  metadata: ToolEndCallbackMetadata,
+) => Promise<void>;
+
+export interface ToolExecuteOptions {
+  /** Loads tools by name, using agentId to look up agent-specific context */
+  loadTools: (
+    toolNames: string[],
+    agentId?: string,
+  ) => Promise<{
+    loadedTools: StructuredToolInterface[];
+    /** Additional configurable properties to merge (e.g., userMCPAuthMap) */
+    configurable?: Record<string, unknown>;
+  }>;
+  /** Callback to process tool artifacts (code output files, file citations, etc.) */
+  toolEndCallback?: ToolEndCallback;
+}
+
+/**
+ * Creates the ON_TOOL_EXECUTE handler for event-driven tool execution.
+ * This handler receives batched tool calls, loads the required tools,
+ * executes them in parallel, and resolves with the results.
+ */
+export function createToolExecuteHandler(options: ToolExecuteOptions): EventHandler {
+  const { loadTools, toolEndCallback } = options;
+
+  return {
+    handle: async (_event: string, data: ToolExecuteBatchRequest) => {
+      const { toolCalls, agentId, configurable, metadata, resolve, reject } = data;
+
+      try {
+        const toolNames = [...new Set(toolCalls.map((tc: ToolCallRequest) => tc.name))];
+        const { loadedTools, configurable: toolConfigurable } = await loadTools(toolNames, agentId);
+        const toolMap = new Map(loadedTools.map((t) => [t.name, t]));
+        const mergedConfigurable = { ...configurable, ...toolConfigurable };
+
+        const results: ToolExecuteResult[] = await Promise.all(
+          toolCalls.map(async (tc: ToolCallRequest) => {
+            const tool = toolMap.get(tc.name);
+
+            if (!tool) {
+              logger.warn(
+                `[ON_TOOL_EXECUTE] Tool "${tc.name}" not found. Available: ${[...toolMap.keys()].join(', ')}`,
+              );
+              return {
+                toolCallId: tc.id,
+                status: 'error' as const,
+                content: '',
+                errorMessage: `Tool ${tc.name} not found`,
+              };
+            }
+
+            try {
+              const toolCallConfig: Record<string, unknown> = {
+                id: tc.id,
+                stepId: tc.stepId,
+                turn: tc.turn,
+              };
+
+              if (
+                tc.codeSessionContext &&
+                (tc.name === Constants.EXECUTE_CODE ||
+                  tc.name === Constants.PROGRAMMATIC_TOOL_CALLING)
+              ) {
+                toolCallConfig.session_id = tc.codeSessionContext.session_id;
+                if (tc.codeSessionContext.files && tc.codeSessionContext.files.length > 0) {
+                  toolCallConfig._injected_files = tc.codeSessionContext.files;
+                }
+              }
+
+              if (tc.name === Constants.PROGRAMMATIC_TOOL_CALLING) {
+                const toolRegistry = mergedConfigurable?.toolRegistry as LCToolRegistry | undefined;
+                const ptcToolMap = mergedConfigurable?.ptcToolMap as
+                  | Map<string, StructuredToolInterface>
+                  | undefined;
+                if (toolRegistry) {
+                  const toolDefs: LCTool[] = Array.from(toolRegistry.values()).filter(
+                    (t) =>
+                      t.name !== Constants.PROGRAMMATIC_TOOL_CALLING &&
+                      t.name !== Constants.TOOL_SEARCH,
+                  );
+                  toolCallConfig.toolDefs = toolDefs;
+                  toolCallConfig.toolMap = ptcToolMap ?? toolMap;
+                }
+              }
+
+              const result = await tool.invoke(tc.args, {
+                toolCall: toolCallConfig,
+                configurable: mergedConfigurable,
+                metadata,
+              } as Record<string, unknown>);
+
+              if (toolEndCallback) {
+                await toolEndCallback(
+                  {
+                    output: {
+                      name: tc.name,
+                      tool_call_id: tc.id,
+                      content: result.content,
+                      artifact: result.artifact,
+                    },
+                  },
+                  {
+                    run_id: (metadata as Record<string, unknown>)?.run_id as string | undefined,
+                    thread_id: (metadata as Record<string, unknown>)?.thread_id as
+                      | string
+                      | undefined,
+                    ...metadata,
+                  },
+                );
+              }
+
+              return {
+                toolCallId: tc.id,
+                content: result.content,
+                artifact: result.artifact,
+                status: 'success' as const,
+              };
+            } catch (toolError) {
+              const error = toolError as Error;
+              logger.error(`[ON_TOOL_EXECUTE] Tool ${tc.name} error:`, error);
+              return {
+                toolCallId: tc.id,
+                status: 'error' as const,
+                content: '',
+                errorMessage: error.message,
+              };
+            }
+          }),
+        );
+
+        resolve(results);
+      } catch (error) {
+        logger.error('[ON_TOOL_EXECUTE] Fatal error:', error);
+        reject(error as Error);
+      }
+    },
+  };
+}
+
+/**
+ * Creates a handlers object that includes ON_TOOL_EXECUTE.
+ * Can be merged with other handler objects.
+ */
+export function createToolExecuteHandlers(
+  options: ToolExecuteOptions,
+): Record<string, EventHandler> {
+  return {
+    [GraphEvents.ON_TOOL_EXECUTE]: createToolExecuteHandler(options),
+  };
+}
diff --git a/packages/api/src/agents/index.ts b/packages/api/src/agents/index.ts
index 5efc22a397..9d13b3dd8e 100644
--- a/packages/api/src/agents/index.ts
+++ b/packages/api/src/agents/index.ts
@@ -1,10 +1,17 @@
 export * from './avatars';
 export * from './chain';
+export * from './client';
+export * from './context';
 export * from './edges';
+export * from './handlers';
 export * from './initialize';
 export * from './legacy';
 export * from './memory';
 export * from './migration';
+export * from './openai';
+export * from './usage';
 export * from './resources';
+export * from './responses';
 export * from './run';
+export * from './tools';
 export * from './validation';
diff --git a/packages/api/src/agents/initialize.ts b/packages/api/src/agents/initialize.ts
index 2671b8d65f..af604beb81 100644
--- a/packages/api/src/agents/initialize.ts
+++ b/packages/api/src/agents/initialize.ts
@@ -1,5 +1,6 @@
 import { Providers } from '@librechat/agents';
 import {
+  Constants,
   ErrorTypes,
   EModelEndpoint,
   EToolResources,
@@ -10,16 +11,22 @@ import {
 } from 'librechat-data-provider';
 import type {
   AgentToolResources,
+  AgentToolOptions,
   TEndpointOption,
   TFile,
   Agent,
   TUser,
 } from 'librechat-data-provider';
+import type { GenericTool, LCToolRegistry, ToolMap, LCTool } from '@librechat/agents';
 import type { Response as ServerResponse } from 'express';
 import type { IMongoFile } from '@librechat/data-schemas';
-import type { GenericTool } from '@librechat/agents';
 import type { InitializeResultBase, ServerRequest, EndpointDbMethods } from '~/types';
-import { getModelMaxTokens, extractLibreChatParams, optionalChainWithEmptyCheck } from '~/utils';
+import {
+  optionalChainWithEmptyCheck,
+  extractLibreChatParams,
+  getModelMaxTokens,
+  getThreadData,
+} from '~/utils';
 import { filterFilesByEndpointConfig } from '~/files';
 import { generateArtifactsPrompt } from '~/prompts';
 import { getProviderConfig } from '~/endpoints';
@@ -35,7 +42,16 @@ export type InitializedAgent = Agent & {
   maxContextTokens: number;
   useLegacyContent: boolean;
   resendFiles: boolean;
+  tool_resources?: AgentToolResources;
   userMCPAuthMap?: Record<string, Record<string, string>>;
+  /** Tool map for ToolNode to use when executing tools (required for PTC) */
+  toolMap?: ToolMap;
+  /** Tool registry for PTC and tool search (only present when MCP tools with env classification exist) */
+  toolRegistry?: LCToolRegistry;
+  /** Serializable tool definitions for event-driven execution */
+  toolDefinitions?: LCTool[];
+  /** Precomputed flag indicating if any tools have defer_loading enabled (for efficient runtime checks) */
+  hasDeferredTools?: boolean;
 };
 
 /**
@@ -51,6 +67,8 @@ export interface InitializeAgentParams {
   agent: Agent;
   /** Conversation ID (optional) */
   conversationId?: string | null;
+  /** Parent message ID for determining the current thread (optional) */
+  parentMessageId?: string | null;
   /** Request files */
   requestFiles?: IMongoFile[];
   /** Function to load agent tools */
@@ -61,11 +79,17 @@ export interface InitializeAgentParams {
     agentId: string;
     tools: string[];
     model: string | null;
+    tool_options: AgentToolOptions | undefined;
     tool_resources: AgentToolResources | undefined;
   }) => Promise<{
-    tools: GenericTool[];
-    toolContextMap: Record<string, unknown>;
+    /** Full tool instances (only present when definitionsOnly=false) */
+    tools?: GenericTool[];
+    toolContextMap?: Record<string, unknown>;
     userMCPAuthMap?: Record<string, Record<string, string>>;
+    toolRegistry?: LCToolRegistry;
+    /** Serializable tool definitions for event-driven mode */
+    toolDefinitions?: LCTool[];
+    hasDeferredTools?: boolean;
   } | null>;
   /** Endpoint option (contains model_parameters and endpoint info) */
   endpointOption?: Partial<TEndpointOption>;
@@ -85,10 +109,23 @@ export interface InitializeAgentDbMethods extends EndpointDbMethods {
   updateFilesUsage: (files: Array<{ file_id: string }>, fileIds?: string[]) => Promise<unknown[]>;
   /** Get files from database */
   getFiles: (filter: unknown, sort: unknown, select: unknown, opts?: unknown) => Promise<unknown[]>;
-  /** Get tool files by IDs */
+  /** Get tool files by IDs (user-uploaded files only, code files handled separately) */
   getToolFilesByIds: (fileIds: string[], toolSet: Set<EToolResources>) => Promise<unknown[]>;
   /** Get conversation file IDs */
   getConvoFiles: (conversationId: string) => Promise<string[] | null>;
+  /** Get code-generated files by conversation ID and optional message IDs */
+  getCodeGeneratedFiles?: (conversationId: string, messageIds?: string[]) => Promise<unknown[]>;
+  /** Get user-uploaded execute_code files by file IDs (from message.files in thread) */
+  getUserCodeFiles?: (fileIds: string[]) => Promise<unknown[]>;
+  /** Get messages for a conversation (supports select for field projection) */
+  getMessages?: (
+    filter: { conversationId: string },
+    select?: string,
+  ) => Promise<Array<{
+    messageId: string;
+    parentMessageId?: string;
+    files?: Array<{ file_id: string }>;
+  }> | null>;
 }
 
 /**
@@ -115,6 +152,7 @@ export async function initializeAgent(
     requestFiles = [],
     conversationId,
     endpointOption,
+    parentMessageId,
     allowedProviders,
     isInitialAgent = false,
   } = params;
@@ -164,9 +202,51 @@ export async function initializeAgent(
         toolResourceSet.add(EToolResources[tool as keyof typeof EToolResources]);
       }
     }
+
     const toolFiles = (await db.getToolFilesByIds(fileIds, toolResourceSet)) as IMongoFile[];
-    if (requestFiles.length || toolFiles.length) {
-      currentFiles = (await db.updateFilesUsage(requestFiles.concat(toolFiles))) as IMongoFile[];
+
+    /**
+     * Retrieve execute_code files filtered to the current thread.
+     * This includes both code-generated files and user-uploaded execute_code files.
+     */
+    let codeGeneratedFiles: IMongoFile[] = [];
+    let userCodeFiles: IMongoFile[] = [];
+
+    if (toolResourceSet.has(EToolResources.execute_code)) {
+      let threadMessageIds: string[] | undefined;
+      let threadFileIds: string[] | undefined;
+
+      if (parentMessageId && parentMessageId !== Constants.NO_PARENT && db.getMessages) {
+        /** Only select fields needed for thread traversal */
+        const messages = await db.getMessages(
+          { conversationId },
+          'messageId parentMessageId files',
+        );
+        if (messages && messages.length > 0) {
+          /** Single O(n) pass: build Map, traverse thread, collect both IDs */
+          const threadData = getThreadData(messages, parentMessageId);
+          threadMessageIds = threadData.messageIds;
+          threadFileIds = threadData.fileIds;
+        }
+      }
+
+      /** Code-generated files (context: execute_code) filtered by messageId */
+      if (db.getCodeGeneratedFiles) {
+        codeGeneratedFiles = (await db.getCodeGeneratedFiles(
+          conversationId,
+          threadMessageIds,
+        )) as IMongoFile[];
+      }
+
+      /** User-uploaded execute_code files (context: agents/message_attachment) from thread messages */
+      if (db.getUserCodeFiles && threadFileIds && threadFileIds.length > 0) {
+        userCodeFiles = (await db.getUserCodeFiles(threadFileIds)) as IMongoFile[];
+      }
+    }
+
+    const allToolFiles = toolFiles.concat(codeGeneratedFiles, userCodeFiles);
+    if (requestFiles.length || allToolFiles.length) {
+      currentFiles = (await db.updateFilesUsage(requestFiles.concat(allToolFiles))) as IMongoFile[];
     }
   } else if (requestFiles.length) {
     currentFiles = (await db.updateFilesUsage(requestFiles)) as IMongoFile[];
@@ -198,9 +278,12 @@ export async function initializeAgent(
   });
 
   const {
-    tools: structuredTools,
+    toolRegistry,
     toolContextMap,
     userMCPAuthMap,
+    toolDefinitions,
+    hasDeferredTools,
+    tools: structuredTools,
   } = (await loadTools?.({
     req,
     res,
@@ -208,8 +291,16 @@ export async function initializeAgent(
     agentId: agent.id,
     tools: agent.tools ?? [],
     model: agent.model,
+    tool_options: agent.tool_options,
     tool_resources,
-  })) ?? { tools: [], toolContextMap: {}, userMCPAuthMap: undefined };
+  })) ?? {
+    tools: [],
+    toolContextMap: {},
+    userMCPAuthMap: undefined,
+    toolRegistry: undefined,
+    toolDefinitions: [],
+    hasDeferredTools: false,
+  };
 
   const { getOptions, overrideProvider } = getProviderConfig({
     provider,
@@ -260,13 +351,17 @@ export async function initializeAgent(
     agent.provider = options.provider;
   }
 
+  /** Check for tool presence from either full instances or definitions (event-driven mode) */
+  const hasAgentTools = (structuredTools?.length ?? 0) > 0 || (toolDefinitions?.length ?? 0) > 0;
+
   let tools: GenericTool[] = options.tools?.length
     ? (options.tools as GenericTool[])
-    : structuredTools;
+    : (structuredTools ?? []);
+
   if (
     (agent.provider === Providers.GOOGLE || agent.provider === Providers.VERTEXAI) &&
     options.tools?.length &&
-    structuredTools?.length
+    hasAgentTools
   ) {
     throw new Error(`{ "type": "${ErrorTypes.GOOGLE_TOOL_CONFLICT}"}`);
   } else if (
@@ -308,13 +403,20 @@ export async function initializeAgent(
 
   const initializedAgent: InitializedAgent = {
     ...agent,
-    tools: (tools ?? []) as GenericTool[] & string[],
-    attachments: finalAttachments,
     resendFiles,
+    toolRegistry,
+    tool_resources,
     userMCPAuthMap,
+    toolDefinitions,
+    hasDeferredTools,
+    attachments: finalAttachments,
     toolContextMap: toolContextMap ?? {},
     useLegacyContent: !!options.useLegacyContent,
-    maxContextTokens: Math.round((agentMaxContextNum - maxOutputTokensNum) * 0.9),
+    tools: (tools ?? []) as GenericTool[] & string[],
+    maxContextTokens:
+      maxContextTokens != null && maxContextTokens > 0
+        ? maxContextTokens
+        : Math.round((agentMaxContextNum - maxOutputTokensNum) * 0.9),
   };
 
   return initializedAgent;
diff --git a/packages/api/src/agents/memory.spec.ts b/packages/api/src/agents/memory.spec.ts
index 1b5242f78d..fddc8ee66d 100644
--- a/packages/api/src/agents/memory.spec.ts
+++ b/packages/api/src/agents/memory.spec.ts
@@ -1,30 +1,54 @@
 import { Types } from 'mongoose';
-import type { Response } from 'express';
-import { Run } from '@librechat/agents';
+import { Run, Providers } from '@librechat/agents';
 import type { IUser } from '@librechat/data-schemas';
-import { createSafeUser } from '~/utils/env';
+import type { Response } from 'express';
 import { processMemory } from './memory';
 
 jest.mock('~/stream/GenerationJobManager');
+
+const mockCreateSafeUser = jest.fn((user) => ({
+  id: user?.id,
+  email: user?.email,
+  name: user?.name,
+  username: user?.username,
+}));
+
+const mockResolveHeaders = jest.fn((opts) => {
+  const headers = opts.headers || {};
+  const user = opts.user || {};
+  const result: Record<string, string> = {};
+  for (const [key, value] of Object.entries(headers)) {
+    let resolved = value as string;
+    resolved = resolved.replace(/\$\{(\w+)\}/g, (_match, envVar) => process.env[envVar] || '');
+    resolved = resolved.replace(/\{\{LIBRECHAT_USER_EMAIL\}\}/g, user.email || '');
+    resolved = resolved.replace(/\{\{LIBRECHAT_USER_ID\}\}/g, user.id || '');
+    result[key] = resolved;
+  }
+  return result;
+});
+
 jest.mock('~/utils', () => ({
   Tokenizer: {
     getTokenCount: jest.fn(() => 10),
   },
+  createSafeUser: (user: unknown) => mockCreateSafeUser(user),
+  resolveHeaders: (opts: unknown) => mockResolveHeaders(opts),
 }));
 
-jest.mock('@librechat/agents', () => ({
-  Run: {
-    create: jest.fn(() => ({
-      processStream: jest.fn(() => Promise.resolve('success')),
-    })),
-  },
-  Providers: {
-    OPENAI: 'openai',
-  },
-  GraphEvents: {
-    TOOL_END: 'tool_end',
-  },
-}));
+const { createSafeUser } = jest.requireMock('~/utils');
+
+jest.mock('@librechat/agents', () => {
+  const actual = jest.requireActual('@librechat/agents');
+  return {
+    Run: {
+      create: jest.fn(() => ({
+        processStream: jest.fn(() => Promise.resolve('success')),
+      })),
+    },
+    Providers: actual.Providers,
+    GraphEvents: actual.GraphEvents,
+  };
+});
 
 function createTestUser(overrides: Partial<IUser> = {}): IUser {
   return {
@@ -229,7 +253,7 @@ describe('Memory Agent Header Resolution', () => {
 
   it('should not throw when llmConfig has no configuration', async () => {
     const llmConfig = {
-      provider: 'openai',
+      provider: Providers.OPENAI,
       model: 'gpt-4o-mini',
     };
 
@@ -262,7 +286,7 @@ describe('Memory Agent Header Resolution', () => {
     } as unknown as Partial<IUser>);
 
     const llmConfig = {
-      provider: 'openai',
+      provider: Providers.OPENAI,
       model: 'gpt-4o-mini',
       configuration: {
         defaultHeaders: {
@@ -295,4 +319,222 @@ describe('Memory Agent Header Resolution', () => {
     expect(safeUser).toHaveProperty('id');
     expect(safeUser).toHaveProperty('email');
   });
+
+  it('should include instructions in user message for Bedrock provider', async () => {
+    const llmConfig = {
+      provider: Providers.BEDROCK,
+      model: 'us.anthropic.claude-haiku-4-5-20251001-v1:0',
+    };
+
+    const { HumanMessage } = await import('@langchain/core/messages');
+    const testMessage = new HumanMessage('test chat content');
+
+    await processMemory({
+      res: mockRes,
+      userId: 'user-123',
+      setMemory: mockMemoryMethods.setMemory,
+      deleteMemory: mockMemoryMethods.deleteMemory,
+      messages: [testMessage],
+      memory: 'existing memory',
+      messageId: 'msg-123',
+      conversationId: 'conv-123',
+      validKeys: ['preferences'],
+      instructions: 'test instructions',
+      llmConfig,
+      user: testUser,
+    });
+
+    expect(Run.create as jest.Mock).toHaveBeenCalled();
+    const runConfig = (Run.create as jest.Mock).mock.calls[0][0];
+
+    // For Bedrock, instructions should NOT be passed to graphConfig
+    expect(runConfig.graphConfig.instructions).toBeUndefined();
+    expect(runConfig.graphConfig.additional_instructions).toBeUndefined();
+  });
+
+  it('should pass instructions to graphConfig for non-Bedrock providers', async () => {
+    const llmConfig = {
+      provider: Providers.OPENAI,
+      model: 'gpt-4o-mini',
+    };
+
+    await processMemory({
+      res: mockRes,
+      userId: 'user-123',
+      setMemory: mockMemoryMethods.setMemory,
+      deleteMemory: mockMemoryMethods.deleteMemory,
+      messages: [],
+      memory: 'existing memory',
+      messageId: 'msg-123',
+      conversationId: 'conv-123',
+      validKeys: ['preferences'],
+      instructions: 'test instructions',
+      llmConfig,
+      user: testUser,
+    });
+
+    expect(Run.create as jest.Mock).toHaveBeenCalled();
+    const runConfig = (Run.create as jest.Mock).mock.calls[0][0];
+
+    // For non-Bedrock providers, instructions should be passed to graphConfig
+    expect(runConfig.graphConfig.instructions).toBe('test instructions');
+    expect(runConfig.graphConfig.additional_instructions).toBeDefined();
+  });
+
+  it('should set temperature to 1 for Bedrock with thinking enabled', async () => {
+    const llmConfig = {
+      provider: Providers.BEDROCK,
+      model: 'us.anthropic.claude-sonnet-4-20250514-v1:0',
+      temperature: 0.7,
+      additionalModelRequestFields: {
+        thinking: {
+          type: 'enabled',
+          budget_tokens: 5000,
+        },
+      },
+    };
+
+    await processMemory({
+      res: mockRes,
+      userId: 'user-123',
+      setMemory: mockMemoryMethods.setMemory,
+      deleteMemory: mockMemoryMethods.deleteMemory,
+      messages: [],
+      memory: 'existing memory',
+      messageId: 'msg-123',
+      conversationId: 'conv-123',
+      validKeys: ['preferences'],
+      instructions: 'test instructions',
+      llmConfig,
+      user: testUser,
+    });
+
+    expect(Run.create as jest.Mock).toHaveBeenCalled();
+    const runConfig = (Run.create as jest.Mock).mock.calls[0][0];
+
+    expect(runConfig.graphConfig.llmConfig.temperature).toBe(1);
+  });
+
+  it('should not modify temperature for Bedrock without thinking enabled', async () => {
+    const llmConfig = {
+      provider: Providers.BEDROCK,
+      model: 'us.anthropic.claude-haiku-4-5-20251001-v1:0',
+      temperature: 0.7,
+    };
+
+    await processMemory({
+      res: mockRes,
+      userId: 'user-123',
+      setMemory: mockMemoryMethods.setMemory,
+      deleteMemory: mockMemoryMethods.deleteMemory,
+      messages: [],
+      memory: 'existing memory',
+      messageId: 'msg-123',
+      conversationId: 'conv-123',
+      validKeys: ['preferences'],
+      instructions: 'test instructions',
+      llmConfig,
+      user: testUser,
+    });
+
+    expect(Run.create as jest.Mock).toHaveBeenCalled();
+    const runConfig = (Run.create as jest.Mock).mock.calls[0][0];
+
+    expect(runConfig.graphConfig.llmConfig.temperature).toBe(0.7);
+  });
+
+  it('should remove temperature for Anthropic with thinking enabled', async () => {
+    const llmConfig = {
+      provider: Providers.ANTHROPIC,
+      model: 'claude-sonnet-4-20250514',
+      temperature: 0.7,
+      thinking: {
+        type: 'enabled',
+        budget_tokens: 5000,
+      },
+    };
+
+    await processMemory({
+      res: mockRes,
+      userId: 'user-123',
+      setMemory: mockMemoryMethods.setMemory,
+      deleteMemory: mockMemoryMethods.deleteMemory,
+      messages: [],
+      memory: 'existing memory',
+      messageId: 'msg-123',
+      conversationId: 'conv-123',
+      validKeys: ['preferences'],
+      instructions: 'test instructions',
+      llmConfig,
+      user: testUser,
+    });
+
+    expect(Run.create as jest.Mock).toHaveBeenCalled();
+    const runConfig = (Run.create as jest.Mock).mock.calls[0][0];
+
+    expect(runConfig.graphConfig.llmConfig.temperature).toBeUndefined();
+    expect(runConfig.graphConfig.llmConfig.thinking).toEqual({
+      type: 'enabled',
+      budget_tokens: 5000,
+    });
+  });
+
+  it('should not modify temperature for Anthropic without thinking enabled', async () => {
+    const llmConfig = {
+      provider: Providers.ANTHROPIC,
+      model: 'claude-sonnet-4-20250514',
+      temperature: 0.7,
+    };
+
+    await processMemory({
+      res: mockRes,
+      userId: 'user-123',
+      setMemory: mockMemoryMethods.setMemory,
+      deleteMemory: mockMemoryMethods.deleteMemory,
+      messages: [],
+      memory: 'existing memory',
+      messageId: 'msg-123',
+      conversationId: 'conv-123',
+      validKeys: ['preferences'],
+      instructions: 'test instructions',
+      llmConfig,
+      user: testUser,
+    });
+
+    expect(Run.create as jest.Mock).toHaveBeenCalled();
+    const runConfig = (Run.create as jest.Mock).mock.calls[0][0];
+
+    expect(runConfig.graphConfig.llmConfig.temperature).toBe(0.7);
+  });
+
+  it('should not modify temperature for Anthropic with thinking type not enabled', async () => {
+    const llmConfig = {
+      provider: Providers.ANTHROPIC,
+      model: 'claude-sonnet-4-20250514',
+      temperature: 0.7,
+      thinking: {
+        type: 'disabled',
+      },
+    };
+
+    await processMemory({
+      res: mockRes,
+      userId: 'user-123',
+      setMemory: mockMemoryMethods.setMemory,
+      deleteMemory: mockMemoryMethods.deleteMemory,
+      messages: [],
+      memory: 'existing memory',
+      messageId: 'msg-123',
+      conversationId: 'conv-123',
+      validKeys: ['preferences'],
+      instructions: 'test instructions',
+      llmConfig,
+      user: testUser,
+    });
+
+    expect(Run.create as jest.Mock).toHaveBeenCalled();
+    const runConfig = (Run.create as jest.Mock).mock.calls[0][0];
+
+    expect(runConfig.graphConfig.llmConfig.temperature).toBe(0.7);
+  });
 });
diff --git a/packages/api/src/agents/memory.ts b/packages/api/src/agents/memory.ts
index dcf26a8666..bb4bd38282 100644
--- a/packages/api/src/agents/memory.ts
+++ b/packages/api/src/agents/memory.ts
@@ -3,6 +3,7 @@ import { z } from 'zod';
 import { tool } from '@langchain/core/tools';
 import { Tools } from 'librechat-data-provider';
 import { logger } from '@librechat/data-schemas';
+import { HumanMessage } from '@langchain/core/messages';
 import { Run, Providers, GraphEvents } from '@librechat/agents';
 import type {
   OpenAIClientOptions,
@@ -13,13 +14,12 @@ import type {
   ToolEndData,
   LLMConfig,
 } from '@librechat/agents';
-import type { TAttachment, MemoryArtifact } from 'librechat-data-provider';
 import type { ObjectId, MemoryMethods, IUser } from '@librechat/data-schemas';
+import type { TAttachment, MemoryArtifact } from 'librechat-data-provider';
 import type { BaseMessage, ToolMessage } from '@langchain/core/messages';
 import type { Response as ServerResponse } from 'express';
 import { GenerationJobManager } from '~/stream/GenerationJobManager';
-import { resolveHeaders, createSafeUser } from '~/utils/env';
-import { Tokenizer } from '~/utils';
+import { Tokenizer, resolveHeaders, createSafeUser } from '~/utils';
 
 type RequiredMemoryMethods = Pick<
   MemoryMethods,
@@ -369,6 +369,30 @@ ${memory ?? 'No existing memories'}`;
       }
     }
 
+    const bedrockConfig = finalLLMConfig as {
+      additionalModelRequestFields?: { thinking?: unknown };
+      temperature?: number;
+    };
+    if (
+      llmConfig?.provider === Providers.BEDROCK &&
+      bedrockConfig.additionalModelRequestFields?.thinking != null &&
+      bedrockConfig.temperature != null
+    ) {
+      (finalLLMConfig as unknown as Record<string, unknown>).temperature = 1;
+    }
+
+    const anthropicConfig = finalLLMConfig as {
+      thinking?: { type?: string };
+      temperature?: number;
+    };
+    if (
+      llmConfig?.provider === Providers.ANTHROPIC &&
+      anthropicConfig.thinking?.type === 'enabled' &&
+      anthropicConfig.temperature != null
+    ) {
+      delete (finalLLMConfig as Record<string, unknown>).temperature;
+    }
+
     const llmConfigWithHeaders = finalLLMConfig as OpenAIClientOptions;
     if (llmConfigWithHeaders?.configuration?.defaultHeaders != null) {
       llmConfigWithHeaders.configuration.defaultHeaders = resolveHeaders({
@@ -383,14 +407,51 @@ ${memory ?? 'No existing memories'}`;
       [GraphEvents.TOOL_END]: new BasicToolEndHandler(memoryCallback),
     };
 
+    /**
+     * For Bedrock provider, include instructions in the user message instead of as a system prompt.
+     * Bedrock's Converse API requires conversations to start with a user message, not a system message.
+     * Other providers can use the standard system prompt approach.
+     */
+    const isBedrock = llmConfig?.provider === Providers.BEDROCK;
+
+    let graphInstructions: string | undefined = instructions;
+    let graphAdditionalInstructions: string | undefined = memoryStatus;
+    let processedMessages = messages;
+
+    if (isBedrock) {
+      const combinedInstructions = [instructions, memoryStatus].filter(Boolean).join('\n\n');
+
+      if (messages.length > 0) {
+        const firstMessage = messages[0];
+        const originalContent =
+          typeof firstMessage.content === 'string' ? firstMessage.content : '';
+
+        if (typeof firstMessage.content !== 'string') {
+          logger.warn(
+            'Bedrock memory processing: First message has non-string content, using empty string',
+          );
+        }
+
+        const bedrockUserMessage = new HumanMessage(
+          `${combinedInstructions}\n\n${originalContent}`,
+        );
+        processedMessages = [bedrockUserMessage, ...messages.slice(1)];
+      } else {
+        processedMessages = [new HumanMessage(combinedInstructions)];
+      }
+
+      graphInstructions = undefined;
+      graphAdditionalInstructions = undefined;
+    }
+
     const run = await Run.create({
       runId: messageId,
       graphConfig: {
         type: 'standard',
         llmConfig: finalLLMConfig,
         tools: [memoryTool, deleteMemoryTool],
-        instructions,
-        additional_instructions: memoryStatus,
+        instructions: graphInstructions,
+        additional_instructions: graphAdditionalInstructions,
         toolEnd: true,
       },
       customHandlers,
@@ -410,7 +471,7 @@ ${memory ?? 'No existing memories'}`;
     } as const;
 
     const inputs = {
-      messages,
+      messages: processedMessages,
     };
     const content = await run.processStream(inputs, config);
     if (content) {
diff --git a/packages/api/src/agents/openai/handlers.ts b/packages/api/src/agents/openai/handlers.ts
new file mode 100644
index 0000000000..0eea609771
--- /dev/null
+++ b/packages/api/src/agents/openai/handlers.ts
@@ -0,0 +1,464 @@
+/**
+ * OpenAI-compatible event handlers for agent streaming.
+ *
+ * These handlers convert LibreChat's internal graph events into OpenAI-compatible
+ * streaming format (SSE with chat.completion.chunk objects).
+ */
+import type { Response as ServerResponse } from 'express';
+import type {
+  ChatCompletionChunkChoice,
+  OpenAIResponseContext,
+  ChatCompletionChunk,
+  CompletionUsage,
+  ToolCall,
+} from './types';
+import type { ToolExecuteOptions } from '~/agents/handlers';
+import { createToolExecuteHandler } from '~/agents/handlers';
+
+/**
+ * Create a chat completion chunk in OpenAI format
+ */
+export function createChunk(
+  context: OpenAIResponseContext,
+  delta: ChatCompletionChunkChoice['delta'],
+  finishReason: ChatCompletionChunkChoice['finish_reason'] = null,
+  usage?: CompletionUsage,
+): ChatCompletionChunk {
+  return {
+    id: context.requestId,
+    object: 'chat.completion.chunk',
+    created: context.created,
+    model: context.model,
+    choices: [
+      {
+        index: 0,
+        delta,
+        finish_reason: finishReason,
+      },
+    ],
+    ...(usage && { usage }),
+  };
+}
+
+/**
+ * Write an SSE event to the response
+ */
+export function writeSSE(res: ServerResponse, data: ChatCompletionChunk | string): void {
+  if (typeof data === 'string') {
+    res.write(`data: ${data}\n\n`);
+  } else {
+    res.write(`data: ${JSON.stringify(data)}\n\n`);
+  }
+}
+
+/**
+ * Lightweight tracker for streaming responses.
+ * Only tracks what's needed for finish_reason and usage - doesn't store content.
+ */
+export interface OpenAIStreamTracker {
+  /** Whether any text content was emitted */
+  hasText: boolean;
+  /** Whether any reasoning content was emitted */
+  hasReasoning: boolean;
+  /** Accumulated tool calls by index */
+  toolCalls: Map<number, ToolCall>;
+  /** Accumulated usage metadata */
+  usage: {
+    promptTokens: number;
+    completionTokens: number;
+    reasoningTokens: number;
+  };
+  /** Mark that text was emitted */
+  addText: () => void;
+  /** Mark that reasoning was emitted */
+  addReasoning: () => void;
+}
+
+/**
+ * Create a lightweight stream tracker (doesn't store content)
+ */
+export function createOpenAIStreamTracker(): OpenAIStreamTracker {
+  const tracker: OpenAIStreamTracker = {
+    hasText: false,
+    hasReasoning: false,
+    toolCalls: new Map(),
+    usage: {
+      promptTokens: 0,
+      completionTokens: 0,
+      reasoningTokens: 0,
+    },
+    addText: () => {
+      tracker.hasText = true;
+    },
+    addReasoning: () => {
+      tracker.hasReasoning = true;
+    },
+  };
+  return tracker;
+}
+
+/**
+ * Content aggregator for non-streaming responses.
+ * Accumulates full text content, reasoning, and tool calls.
+ * Uses arrays for O(n) text accumulation instead of O(n²) string concatenation.
+ */
+export interface OpenAIContentAggregator {
+  /** Accumulated text chunks */
+  textChunks: string[];
+  /** Accumulated reasoning/thinking chunks */
+  reasoningChunks: string[];
+  /** Accumulated tool calls by index */
+  toolCalls: Map<number, ToolCall>;
+  /** Accumulated usage metadata */
+  usage: {
+    promptTokens: number;
+    completionTokens: number;
+    reasoningTokens: number;
+  };
+  /** Get accumulated text (joins chunks) */
+  getText: () => string;
+  /** Get accumulated reasoning (joins chunks) */
+  getReasoning: () => string;
+  /** Add text chunk */
+  addText: (text: string) => void;
+  /** Add reasoning chunk */
+  addReasoning: (text: string) => void;
+}
+
+/**
+ * Create a content aggregator for non-streaming responses
+ */
+export function createOpenAIContentAggregator(): OpenAIContentAggregator {
+  const textChunks: string[] = [];
+  const reasoningChunks: string[] = [];
+
+  return {
+    textChunks,
+    reasoningChunks,
+    toolCalls: new Map(),
+    usage: {
+      promptTokens: 0,
+      completionTokens: 0,
+      reasoningTokens: 0,
+    },
+    getText: () => textChunks.join(''),
+    getReasoning: () => reasoningChunks.join(''),
+    addText: (text: string) => textChunks.push(text),
+    addReasoning: (text: string) => reasoningChunks.push(text),
+  };
+}
+
+/**
+ * Handler configuration for OpenAI streaming
+ */
+export interface OpenAIStreamHandlerConfig {
+  res: ServerResponse;
+  context: OpenAIResponseContext;
+  tracker: OpenAIStreamTracker;
+}
+
+/**
+ * Graph event types from @librechat/agents
+ */
+export const GraphEvents = {
+  CHAT_MODEL_END: 'on_chat_model_end',
+  TOOL_END: 'on_tool_end',
+  CHAT_MODEL_STREAM: 'on_chat_model_stream',
+  ON_RUN_STEP: 'on_run_step',
+  ON_RUN_STEP_DELTA: 'on_run_step_delta',
+  ON_RUN_STEP_COMPLETED: 'on_run_step_completed',
+  ON_MESSAGE_DELTA: 'on_message_delta',
+  ON_REASONING_DELTA: 'on_reasoning_delta',
+  ON_TOOL_EXECUTE: 'on_tool_execute',
+} as const;
+
+/**
+ * Step types from librechat-data-provider
+ */
+export const StepTypes = {
+  MESSAGE_CREATION: 'message_creation',
+  TOOL_CALLS: 'tool_calls',
+} as const;
+
+/**
+ * Event data interfaces
+ */
+export interface MessageDeltaData {
+  id?: string;
+  content?: Array<{ type: string; text?: string }>;
+}
+
+export interface RunStepDeltaData {
+  id?: string;
+  delta?: {
+    type?: string;
+    tool_calls?: Array<{
+      index?: number;
+      id?: string;
+      type?: string;
+      function?: {
+        name?: string;
+        arguments?: string;
+      };
+    }>;
+  };
+}
+
+export interface ToolEndData {
+  output?: {
+    name?: string;
+    tool_call_id?: string;
+    content?: string;
+  };
+}
+
+export interface ModelEndData {
+  output?: {
+    usage_metadata?: {
+      input_tokens?: number;
+      output_tokens?: number;
+      model?: string;
+    };
+  };
+}
+
+/**
+ * Event handler interface
+ */
+export interface EventHandler {
+  handle(
+    event: string,
+    data: unknown,
+    metadata?: Record<string, unknown>,
+    graph?: unknown,
+  ): void | Promise<void>;
+}
+
+/**
+ * Handler for message delta events - streams text content
+ */
+export class OpenAIMessageDeltaHandler implements EventHandler {
+  constructor(private config: OpenAIStreamHandlerConfig) {}
+
+  handle(_event: string, data: MessageDeltaData): void {
+    const content = data?.content;
+    if (!content || !Array.isArray(content)) {
+      return;
+    }
+
+    for (const part of content) {
+      if (part.type === 'text' && part.text) {
+        this.config.tracker.addText();
+        const chunk = createChunk(this.config.context, { content: part.text });
+        writeSSE(this.config.res, chunk);
+      }
+    }
+  }
+}
+
+/**
+ * Handler for run step delta events - streams tool calls
+ */
+export class OpenAIRunStepDeltaHandler implements EventHandler {
+  constructor(private config: OpenAIStreamHandlerConfig) {}
+
+  handle(_event: string, data: RunStepDeltaData): void {
+    const delta = data?.delta;
+    if (!delta || delta.type !== StepTypes.TOOL_CALLS) {
+      return;
+    }
+
+    const toolCalls = delta.tool_calls;
+    if (!toolCalls || !Array.isArray(toolCalls)) {
+      return;
+    }
+
+    for (const tc of toolCalls) {
+      if (tc.index === undefined) {
+        continue;
+      }
+
+      // Initialize tool call in tracker if needed
+      let trackedTc = this.config.tracker.toolCalls.get(tc.index);
+      if (!trackedTc && tc.id) {
+        trackedTc = {
+          id: tc.id,
+          type: 'function',
+          function: {
+            name: '',
+            arguments: '',
+          },
+        };
+        this.config.tracker.toolCalls.set(tc.index, trackedTc);
+      }
+
+      // Build the streaming delta
+      const streamDelta: ChatCompletionChunkChoice['delta'] = {
+        tool_calls: [
+          {
+            index: tc.index,
+            ...(tc.id && { id: tc.id }),
+            ...(tc.type && { type: tc.type as 'function' }),
+            ...(tc.function && {
+              function: {
+                ...(tc.function.name && { name: tc.function.name }),
+                ...(tc.function.arguments && { arguments: tc.function.arguments }),
+              },
+            }),
+          },
+        ],
+      };
+
+      // Update tracked tool call
+      if (trackedTc) {
+        if (tc.function?.name) {
+          trackedTc.function.name += tc.function.name;
+        }
+        if (tc.function?.arguments) {
+          trackedTc.function.arguments += tc.function.arguments;
+        }
+      }
+
+      const chunk = createChunk(this.config.context, streamDelta);
+      writeSSE(this.config.res, chunk);
+    }
+  }
+}
+
+/**
+ * Handler for run step events - sends initial tool call info
+ */
+export class OpenAIRunStepHandler implements EventHandler {
+  constructor(private config: OpenAIStreamHandlerConfig) {}
+
+  handle(_event: string, data: { stepDetails?: { type?: string } }): void {
+    // Run step events are primarily for LibreChat UI, we use deltas for streaming
+    // This handler is a no-op for OpenAI format
+    if (data?.stepDetails?.type === StepTypes.TOOL_CALLS) {
+      // Tool calls will be streamed via delta events
+    }
+  }
+}
+
+/**
+ * Handler for model end events - captures usage
+ */
+export class OpenAIModelEndHandler implements EventHandler {
+  constructor(private config: OpenAIStreamHandlerConfig) {}
+
+  handle(_event: string, data: ModelEndData): void {
+    const usage = data?.output?.usage_metadata;
+    if (!usage) {
+      return;
+    }
+
+    this.config.tracker.usage.promptTokens += usage.input_tokens ?? 0;
+    this.config.tracker.usage.completionTokens += usage.output_tokens ?? 0;
+  }
+}
+
+/**
+ * Handler for chat model stream events
+ */
+export class OpenAIChatModelStreamHandler implements EventHandler {
+  handle(): void {
+    // Handled by message delta handler
+  }
+}
+
+/**
+ * Handler for tool end events
+ */
+export class OpenAIToolEndHandler implements EventHandler {
+  handle(): void {
+    // Tool results don't need to be streamed in OpenAI format
+    // They're used internally by the agent
+  }
+}
+
+/**
+ * Handler for reasoning delta events.
+ * Streams reasoning/thinking content using the `delta.reasoning` field (OpenRouter convention).
+ */
+export class OpenAIReasoningDeltaHandler implements EventHandler {
+  constructor(private config: OpenAIStreamHandlerConfig) {}
+
+  handle(_event: string, data: MessageDeltaData): void {
+    const content = data?.content;
+    if (!content || !Array.isArray(content)) {
+      return;
+    }
+
+    for (const part of content) {
+      if (part.type === 'text' && part.text) {
+        // Mark that reasoning was emitted
+        this.config.tracker.addReasoning();
+
+        // Stream as delta.reasoning (OpenRouter convention)
+        const chunk = createChunk(this.config.context, { reasoning: part.text });
+        writeSSE(this.config.res, chunk);
+      }
+    }
+  }
+}
+
+/**
+ * Create all handlers for OpenAI streaming format
+ */
+export function createOpenAIHandlers(
+  config: OpenAIStreamHandlerConfig,
+  toolExecuteOptions?: ToolExecuteOptions,
+): Record<string, EventHandler> {
+  const handlers: Record<string, EventHandler> = {
+    [GraphEvents.ON_MESSAGE_DELTA]: new OpenAIMessageDeltaHandler(config),
+    [GraphEvents.ON_RUN_STEP_DELTA]: new OpenAIRunStepDeltaHandler(config),
+    [GraphEvents.ON_RUN_STEP]: new OpenAIRunStepHandler(config),
+    [GraphEvents.ON_RUN_STEP_COMPLETED]: new OpenAIRunStepHandler(config),
+    [GraphEvents.CHAT_MODEL_END]: new OpenAIModelEndHandler(config),
+    [GraphEvents.CHAT_MODEL_STREAM]: new OpenAIChatModelStreamHandler(),
+    [GraphEvents.TOOL_END]: new OpenAIToolEndHandler(),
+    [GraphEvents.ON_REASONING_DELTA]: new OpenAIReasoningDeltaHandler(config),
+  };
+
+  if (toolExecuteOptions) {
+    handlers[GraphEvents.ON_TOOL_EXECUTE] = createToolExecuteHandler(toolExecuteOptions);
+  }
+
+  return handlers;
+}
+
+/**
+ * Send the final chunk with finish_reason and optional usage
+ */
+export function sendFinalChunk(
+  config: OpenAIStreamHandlerConfig,
+  finishReason: ChatCompletionChunkChoice['finish_reason'] = 'stop',
+): void {
+  const { res, context, tracker } = config;
+
+  // Determine finish reason based on content
+  let reason = finishReason;
+  if (tracker.toolCalls.size > 0 && !tracker.hasText) {
+    reason = 'tool_calls';
+  }
+
+  // Build usage object with reasoning token details (OpenRouter/OpenAI convention)
+  const usage: CompletionUsage = {
+    prompt_tokens: tracker.usage.promptTokens,
+    completion_tokens: tracker.usage.completionTokens,
+    total_tokens: tracker.usage.promptTokens + tracker.usage.completionTokens,
+  };
+
+  // Add reasoning token breakdown if there are reasoning tokens
+  if (tracker.usage.reasoningTokens > 0) {
+    usage.completion_tokens_details = {
+      reasoning_tokens: tracker.usage.reasoningTokens,
+    };
+  }
+
+  const finalChunk = createChunk(context, {}, reason, usage);
+  writeSSE(res, finalChunk);
+
+  // Send [DONE] marker
+  writeSSE(res, '[DONE]');
+}
diff --git a/packages/api/src/agents/openai/index.ts b/packages/api/src/agents/openai/index.ts
new file mode 100644
index 0000000000..3a0a016108
--- /dev/null
+++ b/packages/api/src/agents/openai/index.ts
@@ -0,0 +1,52 @@
+/**
+ * OpenAI-compatible API for LibreChat agents.
+ *
+ * This module provides an OpenAI v1/chat/completions compatible interface
+ * for interacting with LibreChat agents remotely via API.
+ *
+ * @example
+ * ```typescript
+ * import { createAgentChatCompletion, listAgentModels } from '@librechat/api';
+ *
+ * // POST /v1/chat/completions
+ * app.post('/v1/chat/completions', async (req, res) => {
+ *   await createAgentChatCompletion(req, res, dependencies);
+ * });
+ *
+ * // GET /v1/models
+ * app.get('/v1/models', async (req, res) => {
+ *   await listAgentModels(req, res, { getAgents });
+ * });
+ * ```
+ *
+ * Request format:
+ * ```json
+ * {
+ *   "model": "agent_id_here",
+ *   "messages": [
+ *     {"role": "user", "content": "Hello!"}
+ *   ],
+ *   "stream": true
+ * }
+ * ```
+ *
+ * The "model" parameter should be the agent ID you want to invoke.
+ * Use the /v1/models endpoint to list available agents.
+ */
+
+export * from './types';
+export * from './handlers';
+export {
+  createAgentChatCompletion,
+  listAgentModels,
+  convertMessages,
+  validateRequest,
+  isChatCompletionValidationFailure,
+  createErrorResponse,
+  sendErrorResponse,
+  buildNonStreamingResponse,
+  type ChatCompletionDependencies,
+  type ChatCompletionValidationResult,
+  type ChatCompletionValidationSuccess,
+  type ChatCompletionValidationFailure,
+} from './service';
diff --git a/packages/api/src/agents/openai/service.ts b/packages/api/src/agents/openai/service.ts
new file mode 100644
index 0000000000..807ce8db71
--- /dev/null
+++ b/packages/api/src/agents/openai/service.ts
@@ -0,0 +1,560 @@
+/**
+ * OpenAI-compatible chat completions service for agents.
+ *
+ * This service provides an OpenAI v1/chat/completions compatible API for
+ * interacting with LibreChat agents. The agent_id is passed as the "model"
+ * parameter per OpenAI spec.
+ *
+ * Usage:
+ * ```typescript
+ * import { createAgentChatCompletion } from '@librechat/api';
+ *
+ * // In your Express route handler:
+ * app.post('/v1/chat/completions', async (req, res) => {
+ *   await createAgentChatCompletion(req, res, {
+ *     getAgent: db.getAgent,
+ *     // ... other dependencies
+ *   });
+ * });
+ * ```
+ */
+import { nanoid } from 'nanoid';
+import type { Response as ServerResponse, Request } from 'express';
+import type {
+  ChatCompletionResponse,
+  OpenAIResponseContext,
+  ChatCompletionRequest,
+  OpenAIErrorResponse,
+  CompletionUsage,
+  ChatMessage,
+  ToolCall,
+} from './types';
+import type { OpenAIStreamHandlerConfig, EventHandler } from './handlers';
+import {
+  createOpenAIContentAggregator,
+  createOpenAIStreamTracker,
+  createOpenAIHandlers,
+  sendFinalChunk,
+  createChunk,
+  writeSSE,
+} from './handlers';
+import type { ToolExecuteOptions } from '../handlers';
+
+/**
+ * Dependencies for the chat completion service
+ */
+export interface ChatCompletionDependencies {
+  /** Get agent by ID */
+  getAgent: (params: { id: string }) => Promise<Agent | null>;
+  /** Initialize agent for use */
+  initializeAgent: (params: InitializeAgentParams) => Promise<InitializedAgent>;
+  /** Load agent tools */
+  loadAgentTools?: LoadToolsFn;
+  /** Get models config */
+  getModelsConfig?: (req: Request) => Promise<unknown>;
+  /** Validate agent model */
+  validateAgentModel?: (
+    params: unknown,
+  ) => Promise<{ isValid: boolean; error?: { message: string } }>;
+  /** Log violation */
+  logViolation?: (
+    req: Request,
+    res: ServerResponse,
+    type: string,
+    info: unknown,
+    score: number,
+  ) => Promise<void>;
+  /** Create agent run */
+  createRun?: CreateRunFn;
+  /** App config */
+  appConfig?: AppConfig;
+  /** Tool execute options for event-driven tool execution */
+  toolExecuteOptions?: ToolExecuteOptions;
+}
+
+/**
+ * Agent type from librechat-data-provider
+ */
+interface Agent {
+  id: string;
+  name?: string;
+  model?: string;
+  provider: string;
+  tools?: string[];
+  instructions?: string;
+  model_parameters?: Record<string, unknown>;
+  tool_resources?: Record<string, unknown>;
+  tool_options?: Record<string, unknown>;
+  [key: string]: unknown;
+}
+
+/**
+ * Initialized agent type - note: after initialization, tools become structured tool objects
+ */
+interface InitializedAgent {
+  id: string;
+  name?: string;
+  model?: string;
+  provider: string;
+  /** After initialization, tools are structured tool objects, not strings */
+  tools: unknown[];
+  instructions?: string;
+  model_parameters?: Record<string, unknown>;
+  tool_resources?: Record<string, unknown>;
+  tool_options?: Record<string, unknown>;
+  attachments: unknown[];
+  toolContextMap: Record<string, unknown>;
+  maxContextTokens: number;
+  userMCPAuthMap?: Record<string, Record<string, string>>;
+  [key: string]: unknown;
+}
+
+/**
+ * Initialize agent params
+ */
+interface InitializeAgentParams {
+  req: Request;
+  res: ServerResponse;
+  agent: Agent;
+  conversationId?: string | null;
+  parentMessageId?: string | null;
+  requestFiles?: unknown[];
+  loadTools?: LoadToolsFn;
+  endpointOption?: Record<string, unknown>;
+  allowedProviders: Set<string>;
+  isInitialAgent?: boolean;
+}
+
+/**
+ * Tool loading function type
+ */
+type LoadToolsFn = (params: {
+  req: Request;
+  res: ServerResponse;
+  provider: string;
+  agentId: string;
+  tools: string[];
+  model: string | null;
+  tool_options: unknown;
+  tool_resources: unknown;
+}) => Promise<{
+  tools: unknown[];
+  toolContextMap: Record<string, unknown>;
+  userMCPAuthMap?: Record<string, Record<string, string>>;
+} | null>;
+
+/**
+ * Create run function type
+ */
+type CreateRunFn = (params: {
+  agents: unknown[];
+  messages: unknown[];
+  runId: string;
+  signal: AbortSignal;
+  customHandlers: Record<string, EventHandler>;
+  requestBody: Record<string, unknown>;
+  user: Record<string, unknown>;
+  tokenCounter?: (message: unknown) => number;
+}) => Promise<{
+  Graph?: unknown;
+  processStream: (
+    input: { messages: unknown[] },
+    config: Record<string, unknown>,
+    options: Record<string, unknown>,
+  ) => Promise<void>;
+} | null>;
+
+/**
+ * App config type
+ */
+interface AppConfig {
+  endpoints?: Record<string, unknown>;
+  [key: string]: unknown;
+}
+
+/**
+ * Convert OpenAI messages to LibreChat format
+ */
+export function convertMessages(messages: ChatMessage[]): unknown[] {
+  return messages.map((msg) => {
+    let content: string | unknown[];
+    if (typeof msg.content === 'string') {
+      content = msg.content;
+    } else if (msg.content) {
+      content = msg.content.map((part) => {
+        if (part.type === 'text') {
+          return { type: 'text', text: part.text };
+        }
+        if (part.type === 'image_url') {
+          return { type: 'image_url', image_url: part.image_url };
+        }
+        return part;
+      });
+    } else {
+      content = '';
+    }
+
+    return {
+      role: msg.role,
+      content,
+      ...(msg.name && { name: msg.name }),
+      ...(msg.tool_calls && { tool_calls: msg.tool_calls }),
+      ...(msg.tool_call_id && { tool_call_id: msg.tool_call_id }),
+    };
+  });
+}
+
+/**
+ * Create an error response in OpenAI format
+ */
+export function createErrorResponse(
+  message: string,
+  type = 'invalid_request_error',
+  code: string | null = null,
+): OpenAIErrorResponse {
+  return {
+    error: {
+      message,
+      type,
+      param: null,
+      code,
+    },
+  };
+}
+
+/**
+ * Send an error response
+ */
+export function sendErrorResponse(
+  res: ServerResponse,
+  statusCode: number,
+  message: string,
+  type = 'invalid_request_error',
+  code: string | null = null,
+): void {
+  res.status(statusCode).json(createErrorResponse(message, type, code));
+}
+
+/**
+ * Validation result types for chat completion requests
+ */
+export type ChatCompletionValidationSuccess = { valid: true; request: ChatCompletionRequest };
+export type ChatCompletionValidationFailure = { valid: false; error: string };
+export type ChatCompletionValidationResult =
+  | ChatCompletionValidationSuccess
+  | ChatCompletionValidationFailure;
+
+/**
+ * Type guard for validation failure
+ */
+export function isChatCompletionValidationFailure(
+  result: ChatCompletionValidationResult,
+): result is ChatCompletionValidationFailure {
+  return !result.valid;
+}
+
+/**
+ * Validate the chat completion request
+ */
+export function validateRequest(body: unknown): ChatCompletionValidationResult {
+  if (!body || typeof body !== 'object') {
+    return { valid: false, error: 'Request body is required' };
+  }
+
+  const request = body as Record<string, unknown>;
+
+  if (!request.model || typeof request.model !== 'string') {
+    return { valid: false, error: 'model (agent_id) is required' };
+  }
+
+  if (!request.messages || !Array.isArray(request.messages)) {
+    return { valid: false, error: 'messages array is required' };
+  }
+
+  if (request.messages.length === 0) {
+    return { valid: false, error: 'messages array cannot be empty' };
+  }
+
+  // Validate each message has role and content
+  for (let i = 0; i < request.messages.length; i++) {
+    const msg = request.messages[i] as Record<string, unknown>;
+    if (!msg.role || typeof msg.role !== 'string') {
+      return { valid: false, error: `messages[${i}].role is required` };
+    }
+    if (!['system', 'user', 'assistant', 'tool'].includes(msg.role)) {
+      return {
+        valid: false,
+        error: `messages[${i}].role must be one of: system, user, assistant, tool`,
+      };
+    }
+  }
+
+  return { valid: true, request: request as unknown as ChatCompletionRequest };
+}
+
+/**
+ * Build a non-streaming response from aggregated content
+ */
+export function buildNonStreamingResponse(
+  context: OpenAIResponseContext,
+  text: string,
+  reasoning: string,
+  toolCalls: Map<number, ToolCall>,
+  usage: CompletionUsage,
+): ChatCompletionResponse {
+  const toolCallsArray = Array.from(toolCalls.values());
+  const finishReason = toolCallsArray.length > 0 && !text ? 'tool_calls' : 'stop';
+
+  return {
+    id: context.requestId,
+    object: 'chat.completion',
+    created: context.created,
+    model: context.model,
+    choices: [
+      {
+        index: 0,
+        message: {
+          role: 'assistant',
+          content: text || null,
+          ...(reasoning && { reasoning }),
+          ...(toolCallsArray.length > 0 && { tool_calls: toolCallsArray }),
+        },
+        finish_reason: finishReason,
+      },
+    ],
+    usage,
+  };
+}
+
+/**
+ * Main handler for OpenAI-compatible chat completions with agents.
+ *
+ * This function:
+ * 1. Validates the request
+ * 2. Looks up the agent by ID (model parameter)
+ * 3. Initializes the agent with tools
+ * 4. Runs the agent and streams/returns the response
+ *
+ * @param req - Express request object
+ * @param res - Express response object
+ * @param deps - Dependencies for the service
+ */
+export async function createAgentChatCompletion(
+  req: Request,
+  res: ServerResponse,
+  deps: ChatCompletionDependencies,
+): Promise<void> {
+  // Validate request
+  const validation = validateRequest(req.body);
+  if (isChatCompletionValidationFailure(validation)) {
+    sendErrorResponse(res, 400, validation.error);
+    return;
+  }
+
+  const request = validation.request;
+  const agentId = request.model;
+  const requestedStreaming = request.stream === true;
+
+  // Look up the agent
+  const agent = await deps.getAgent({ id: agentId });
+  if (!agent) {
+    sendErrorResponse(
+      res,
+      404,
+      `Agent not found: ${agentId}`,
+      'invalid_request_error',
+      'model_not_found',
+    );
+    return;
+  }
+
+  // Generate IDs
+  const requestId = `chatcmpl-${nanoid()}`;
+  const conversationId = request.conversation_id ?? nanoid();
+  const created = Math.floor(Date.now() / 1000);
+
+  // Build response context
+  const context: OpenAIResponseContext = {
+    created,
+    requestId,
+    model: agentId,
+  };
+
+  // Set up abort controller
+  const abortController = new AbortController();
+
+  // Handle client disconnect
+  req.on('close', () => {
+    abortController.abort();
+  });
+
+  try {
+    // Build allowed providers set (empty = all allowed)
+    const allowedProviders = new Set<string>();
+
+    // Initialize the agent first to check for disableStreaming
+    const initializedAgent = await deps.initializeAgent({
+      req,
+      res,
+      agent,
+      conversationId,
+      parentMessageId: request.parent_message_id,
+      loadTools: deps.loadAgentTools,
+      endpointOption: {
+        endpoint: agent.provider,
+        model_parameters: agent.model_parameters ?? {},
+      },
+      allowedProviders,
+      isInitialAgent: true,
+    });
+
+    // Determine if streaming is enabled (check both request and agent config)
+    const streamingDisabled = !!(initializedAgent.model_parameters as Record<string, unknown>)
+      ?.disableStreaming;
+    const isStreaming = requestedStreaming && !streamingDisabled;
+
+    // Create tracker for streaming or aggregator for non-streaming
+    const tracker = isStreaming ? createOpenAIStreamTracker() : null;
+    const aggregator = isStreaming ? null : createOpenAIContentAggregator();
+
+    // Set up response headers for streaming
+    if (isStreaming) {
+      res.setHeader('Content-Type', 'text/event-stream');
+      res.setHeader('Cache-Control', 'no-cache');
+      res.setHeader('Connection', 'keep-alive');
+      res.setHeader('X-Accel-Buffering', 'no');
+      res.flushHeaders();
+
+      // Send initial chunk with role
+      const initialChunk = createChunk(context, { role: 'assistant' });
+      writeSSE(res, initialChunk);
+    }
+
+    // Create handler config (only used for streaming)
+    const handlerConfig: OpenAIStreamHandlerConfig | null =
+      isStreaming && tracker
+        ? {
+            res,
+            context,
+            tracker,
+          }
+        : null;
+
+    // Create event handlers
+    const eventHandlers =
+      isStreaming && handlerConfig
+        ? createOpenAIHandlers(handlerConfig, deps.toolExecuteOptions)
+        : {};
+
+    // Convert messages to internal format
+    const messages = convertMessages(request.messages);
+
+    // Create and run the agent
+    if (deps.createRun) {
+      const userId = (req as unknown as { user?: { id?: string } }).user?.id ?? 'api-user';
+
+      const run = await deps.createRun({
+        agents: [initializedAgent],
+        messages,
+        runId: requestId,
+        signal: abortController.signal,
+        customHandlers: eventHandlers,
+        requestBody: {
+          messageId: requestId,
+          conversationId,
+        },
+        user: { id: userId },
+      });
+
+      if (run) {
+        await run.processStream(
+          { messages },
+          {
+            runName: 'AgentRun',
+            configurable: {
+              thread_id: conversationId,
+              user_id: userId,
+            },
+            signal: abortController.signal,
+            streamMode: 'values',
+            version: 'v2',
+          },
+          {},
+        );
+      }
+    }
+
+    // Finalize response
+    if (isStreaming && handlerConfig) {
+      sendFinalChunk(handlerConfig);
+      res.end();
+    } else if (aggregator) {
+      // Build and send non-streaming response
+      const usage: CompletionUsage = {
+        prompt_tokens: aggregator.usage.promptTokens,
+        completion_tokens: aggregator.usage.completionTokens,
+        total_tokens: aggregator.usage.promptTokens + aggregator.usage.completionTokens,
+        ...(aggregator.usage.reasoningTokens > 0 && {
+          completion_tokens_details: { reasoning_tokens: aggregator.usage.reasoningTokens },
+        }),
+      };
+      const response = buildNonStreamingResponse(
+        context,
+        aggregator.getText(),
+        aggregator.getReasoning(),
+        aggregator.toolCalls,
+        usage,
+      );
+      res.json(response);
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'An error occurred';
+
+    // Check if we already started streaming (headers sent)
+    if (res.headersSent) {
+      // Headers already sent, try to send error in stream format
+      const errorChunk = createChunk(context, { content: `\n\nError: ${errorMessage}` }, 'stop');
+      writeSSE(res, errorChunk);
+      writeSSE(res, '[DONE]');
+      res.end();
+    } else {
+      sendErrorResponse(res, 500, errorMessage, 'server_error');
+    }
+  }
+}
+
+/**
+ * List available agents/models
+ *
+ * This provides a /v1/models compatible endpoint that lists available agents.
+ */
+export async function listAgentModels(
+  _req: Request,
+  res: ServerResponse,
+  deps: { getAgents: (params: Record<string, unknown>) => Promise<Agent[]> },
+): Promise<void> {
+  try {
+    const agents = await deps.getAgents({});
+
+    const models = agents.map((agent) => ({
+      id: agent.id,
+      object: 'model',
+      created: Math.floor(Date.now() / 1000),
+      owned_by: 'librechat',
+      permission: [],
+      root: agent.id,
+      parent: null,
+      // Extensions
+      name: agent.name,
+      provider: agent.provider,
+    }));
+
+    res.json({
+      object: 'list',
+      data: models,
+    });
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'Failed to list models';
+    sendErrorResponse(res, 500, errorMessage, 'server_error');
+  }
+}
diff --git a/packages/api/src/agents/openai/types.ts b/packages/api/src/agents/openai/types.ts
new file mode 100644
index 0000000000..a33d01d085
--- /dev/null
+++ b/packages/api/src/agents/openai/types.ts
@@ -0,0 +1,194 @@
+/**
+ * OpenAI-compatible types for the agent chat completions API.
+ * These types follow the OpenAI API spec for /v1/chat/completions.
+ *
+ * Note: This API uses agent_id as the "model" parameter per OpenAI spec.
+ * In the future, this will be extended to support the Responses API.
+ */
+
+/**
+ * Content part types for OpenAI format
+ */
+export interface OpenAITextContentPart {
+  type: 'text';
+  text: string;
+}
+
+export interface OpenAIImageContentPart {
+  type: 'image_url';
+  image_url: {
+    url: string;
+    detail?: 'auto' | 'low' | 'high';
+  };
+}
+
+export type OpenAIContentPart = OpenAITextContentPart | OpenAIImageContentPart;
+
+/**
+ * Tool call in OpenAI format
+ */
+export interface ToolCall {
+  id: string;
+  type: 'function';
+  function: {
+    name: string;
+    arguments: string;
+  };
+}
+
+/**
+ * OpenAI chat message format
+ */
+export interface ChatMessage {
+  role: 'system' | 'user' | 'assistant' | 'tool';
+  content: string | OpenAIContentPart[] | null;
+  name?: string;
+  tool_calls?: ToolCall[];
+  tool_call_id?: string;
+}
+
+/**
+ * OpenAI chat completion request
+ */
+export interface ChatCompletionRequest {
+  /** Agent ID to invoke (maps to model in OpenAI spec) */
+  model: string;
+  /** Conversation messages */
+  messages: ChatMessage[];
+  /** Whether to stream the response */
+  stream?: boolean;
+  /** Maximum tokens to generate */
+  max_tokens?: number;
+  /** Temperature for sampling */
+  temperature?: number;
+  /** Top-p sampling */
+  top_p?: number;
+  /** Frequency penalty */
+  frequency_penalty?: number;
+  /** Presence penalty */
+  presence_penalty?: number;
+  /** Stop sequences */
+  stop?: string | string[];
+  /** User identifier */
+  user?: string;
+  /** Conversation ID (LibreChat extension) */
+  conversation_id?: string;
+  /** Parent message ID (LibreChat extension) */
+  parent_message_id?: string;
+}
+
+/**
+ * Token usage information
+ */
+export interface CompletionUsage {
+  prompt_tokens: number;
+  completion_tokens: number;
+  total_tokens: number;
+  /** Detailed breakdown of output tokens (OpenRouter/OpenAI convention) */
+  completion_tokens_details?: {
+    reasoning_tokens?: number;
+  };
+}
+
+/**
+ * Non-streaming choice
+ */
+export interface ChatCompletionChoice {
+  index: number;
+  message: {
+    role: 'assistant';
+    content: string | null;
+    /** Reasoning/thinking content (OpenRouter convention) */
+    reasoning?: string | null;
+    tool_calls?: ToolCall[];
+  };
+  finish_reason: 'stop' | 'length' | 'tool_calls' | 'content_filter' | null;
+}
+
+/**
+ * Non-streaming response
+ */
+export interface ChatCompletionResponse {
+  id: string;
+  object: 'chat.completion';
+  created: number;
+  model: string;
+  choices: ChatCompletionChoice[];
+  usage?: CompletionUsage;
+}
+
+/**
+ * Streaming choice delta
+ * Note: `reasoning` field follows OpenRouter convention for streaming reasoning/thinking content
+ */
+export interface ChatCompletionChunkChoice {
+  index: number;
+  delta: {
+    role?: 'assistant';
+    content?: string | null;
+    /** Reasoning/thinking content (OpenRouter convention) */
+    reasoning?: string | null;
+    tool_calls?: Array<{
+      index: number;
+      id?: string;
+      type?: 'function';
+      function?: {
+        name?: string;
+        arguments?: string;
+      };
+    }>;
+  };
+  finish_reason: 'stop' | 'length' | 'tool_calls' | 'content_filter' | null;
+}
+
+/**
+ * Streaming response chunk
+ */
+export interface ChatCompletionChunk {
+  id: string;
+  object: 'chat.completion.chunk';
+  created: number;
+  model: string;
+  choices: ChatCompletionChunkChoice[];
+  /** Final chunk may include usage */
+  usage?: CompletionUsage;
+}
+
+/**
+ * SSE event wrapper for streaming
+ */
+export interface SSEEvent {
+  data: ChatCompletionChunk | '[DONE]';
+}
+
+/**
+ * Context for building OpenAI responses
+ */
+export interface OpenAIResponseContext {
+  /** Request ID for the chat completion */
+  requestId: string;
+  /** Model/agent ID */
+  model: string;
+  /** Created timestamp */
+  created: number;
+}
+
+/**
+ * Aggregated content for building final response
+ */
+export interface AggregatedContent {
+  text: string;
+  toolCalls: ToolCall[];
+}
+
+/**
+ * Error response in OpenAI format
+ */
+export interface OpenAIErrorResponse {
+  error: {
+    message: string;
+    type: string;
+    param: string | null;
+    code: string | null;
+  };
+}
diff --git a/packages/api/src/agents/responses/__tests__/responses-api.live.test.sh b/packages/api/src/agents/responses/__tests__/responses-api.live.test.sh
new file mode 100755
index 0000000000..657e64c8e5
--- /dev/null
+++ b/packages/api/src/agents/responses/__tests__/responses-api.live.test.sh
@@ -0,0 +1,193 @@
+#!/usr/bin/env bash
+#
+# Live integration tests for the Responses API endpoint.
+# Sends curl requests to a running LibreChat server to verify
+# multi-turn conversations with output_text / refusal blocks work.
+#
+# Usage:
+#   ./responses-api.live.test.sh <BASE_URL> <API_KEY> <AGENT_ID>
+#
+# Example:
+#   ./responses-api.live.test.sh http://localhost:3080 sk-abc123 agent_xyz
+
+set -euo pipefail
+
+BASE_URL="${1:?Usage: $0 <BASE_URL> <API_KEY> <AGENT_ID>}"
+API_KEY="${2:?Usage: $0 <BASE_URL> <API_KEY> <AGENT_ID>}"
+AGENT_ID="${3:?Usage: $0 <BASE_URL> <API_KEY> <AGENT_ID>}"
+
+ENDPOINT="${BASE_URL}/v1/responses"
+PASS=0
+FAIL=0
+
+# ── Helpers ───────────────────────────────────────────────────────────
+
+post_json() {
+  local label="$1"
+  local body="$2"
+  local stream="${3:-false}"
+
+  echo "──────────────────────────────────────────────"
+  echo "TEST: ${label}"
+  echo "──────────────────────────────────────────────"
+
+  local http_code
+  local response
+
+  if [ "$stream" = "true" ]; then
+    # For streaming, just check we get a 200 and some SSE data
+    response=$(curl -s -w "\n%{http_code}" \
+      -X POST "${ENDPOINT}" \
+      -H "Content-Type: application/json" \
+      -H "Authorization: Bearer ${API_KEY}" \
+      -d "${body}" \
+      --max-time 60)
+  else
+    response=$(curl -s -w "\n%{http_code}" \
+      -X POST "${ENDPOINT}" \
+      -H "Content-Type: application/json" \
+      -H "Authorization: Bearer ${API_KEY}" \
+      -d "${body}" \
+      --max-time 60)
+  fi
+
+  http_code=$(echo "$response" | tail -1)
+  local body_out
+  body_out=$(echo "$response" | sed '$d')
+
+  if [ "$http_code" = "200" ]; then
+    echo "  ✓ HTTP 200"
+    PASS=$((PASS + 1))
+  else
+    echo "  ✗ HTTP ${http_code}"
+    echo "  Response: ${body_out}"
+    FAIL=$((FAIL + 1))
+  fi
+
+  # Print truncated response for inspection
+  echo "  Response (first 300 chars): ${body_out:0:300}"
+  echo ""
+
+  # Return the body for chaining
+  echo "$body_out"
+}
+
+extract_response_id() {
+  # Extract "id" field from JSON response
+  echo "$1" | grep -o '"id":"[^"]*"' | head -1 | cut -d'"' -f4
+}
+
+# ── Test 1: Basic single-turn request ─────────────────────────────────
+
+RESP1=$(post_json "Basic single-turn request" "$(cat <<EOF
+{
+  "model": "${AGENT_ID}",
+  "input": "Say hello in exactly 5 words.",
+  "stream": false
+}
+EOF
+)")
+
+# ── Test 2: Multi-turn with output_text assistant blocks ──────────────
+
+post_json "Multi-turn with output_text blocks (the original bug)" "$(cat <<EOF
+{
+  "model": "${AGENT_ID}",
+  "input": [
+    {
+      "type": "message",
+      "role": "user",
+      "content": [{"type": "input_text", "text": "What is 2+2?"}]
+    },
+    {
+      "type": "message",
+      "role": "assistant",
+      "content": [{"type": "output_text", "text": "2+2 equals 4.", "annotations": [], "logprobs": []}]
+    },
+    {
+      "type": "message",
+      "role": "user",
+      "content": [{"type": "input_text", "text": "And what is 3+3?"}]
+    }
+  ],
+  "stream": false
+}
+EOF
+)" > /dev/null
+
+# ── Test 3: Multi-turn with refusal blocks ────────────────────────────
+
+post_json "Multi-turn with refusal blocks" "$(cat <<EOF
+{
+  "model": "${AGENT_ID}",
+  "input": [
+    {
+      "type": "message",
+      "role": "user",
+      "content": [{"type": "input_text", "text": "Do something bad"}]
+    },
+    {
+      "type": "message",
+      "role": "assistant",
+      "content": [{"type": "refusal", "refusal": "I cannot help with that."}]
+    },
+    {
+      "type": "message",
+      "role": "user",
+      "content": [{"type": "input_text", "text": "OK, just say hello then."}]
+    }
+  ],
+  "stream": false
+}
+EOF
+)" > /dev/null
+
+# ── Test 4: Streaming request ─────────────────────────────────────────
+
+post_json "Streaming single-turn request" "$(cat <<EOF
+{
+  "model": "${AGENT_ID}",
+  "input": "Say hi in one word.",
+  "stream": true
+}
+EOF
+)" "true" > /dev/null
+
+# ── Test 5: Back-and-forth using previous_response_id ─────────────────
+
+RESP5=$(post_json "First turn for previous_response_id chain" "$(cat <<EOF
+{
+  "model": "${AGENT_ID}",
+  "input": "Remember this number: 42. Just confirm you got it.",
+  "stream": false
+}
+EOF
+)")
+
+RESP5_ID=$(extract_response_id "$RESP5")
+
+if [ -n "$RESP5_ID" ]; then
+  echo "  Extracted response ID: ${RESP5_ID}"
+  post_json "Follow-up using previous_response_id" "$(cat <<EOF
+{
+  "model": "${AGENT_ID}",
+  "input": "What number did I ask you to remember?",
+  "previous_response_id": "${RESP5_ID}",
+  "stream": false
+}
+EOF
+)" > /dev/null
+else
+  echo "  ⚠ Could not extract response ID, skipping follow-up test"
+  FAIL=$((FAIL + 1))
+fi
+
+# ── Summary ───────────────────────────────────────────────────────────
+
+echo "══════════════════════════════════════════════"
+echo "RESULTS: ${PASS} passed, ${FAIL} failed"
+echo "══════════════════════════════════════════════"
+
+if [ "$FAIL" -gt 0 ]; then
+  exit 1
+fi
diff --git a/packages/api/src/agents/responses/__tests__/service.test.ts b/packages/api/src/agents/responses/__tests__/service.test.ts
new file mode 100644
index 0000000000..b9b64d21ee
--- /dev/null
+++ b/packages/api/src/agents/responses/__tests__/service.test.ts
@@ -0,0 +1,333 @@
+import { convertInputToMessages } from '../service';
+import type { InputItem } from '../types';
+
+describe('convertInputToMessages', () => {
+  // ── String input shorthand ─────────────────────────────────────────
+  it('converts a string input to a single user message', () => {
+    const result = convertInputToMessages('Hello');
+    expect(result).toEqual([{ role: 'user', content: 'Hello' }]);
+  });
+
+  // ── Empty input array ──────────────────────────────────────────────
+  it('returns an empty array for empty input', () => {
+    const result = convertInputToMessages([]);
+    expect(result).toEqual([]);
+  });
+
+  // ── Role mapping ───────────────────────────────────────────────────
+  it('maps developer role to system', () => {
+    const input: InputItem[] = [
+      { type: 'message', role: 'developer', content: 'You are helpful.' },
+    ];
+    expect(convertInputToMessages(input)).toEqual([
+      { role: 'system', content: 'You are helpful.' },
+    ]);
+  });
+
+  it('maps system role to system', () => {
+    const input: InputItem[] = [{ type: 'message', role: 'system', content: 'System prompt.' }];
+    expect(convertInputToMessages(input)).toEqual([{ role: 'system', content: 'System prompt.' }]);
+  });
+
+  it('maps user role to user', () => {
+    const input: InputItem[] = [{ type: 'message', role: 'user', content: 'Hi' }];
+    expect(convertInputToMessages(input)).toEqual([{ role: 'user', content: 'Hi' }]);
+  });
+
+  it('maps assistant role to assistant', () => {
+    const input: InputItem[] = [{ type: 'message', role: 'assistant', content: 'Hello!' }];
+    expect(convertInputToMessages(input)).toEqual([{ role: 'assistant', content: 'Hello!' }]);
+  });
+
+  it('defaults unknown roles to user', () => {
+    const input = [
+      { type: 'message', role: 'unknown_role', content: 'test' },
+    ] as unknown as InputItem[];
+    expect(convertInputToMessages(input)[0].role).toBe('user');
+  });
+
+  // ── input_text content blocks ──────────────────────────────────────
+  it('converts input_text blocks to text blocks', () => {
+    const input: InputItem[] = [
+      {
+        type: 'message',
+        role: 'user',
+        content: [{ type: 'input_text', text: 'Hello world' }],
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'user', content: [{ type: 'text', text: 'Hello world' }] }]);
+  });
+
+  // ── output_text content blocks (the original bug) ──────────────────
+  it('converts output_text blocks to text blocks', () => {
+    const input: InputItem[] = [
+      {
+        type: 'message',
+        role: 'assistant',
+        content: [{ type: 'output_text', text: 'I can help!', annotations: [], logprobs: [] }],
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      { role: 'assistant', content: [{ type: 'text', text: 'I can help!' }] },
+    ]);
+  });
+
+  // ── refusal content blocks ─────────────────────────────────────────
+  it('converts refusal blocks to text blocks', () => {
+    const input: InputItem[] = [
+      {
+        type: 'message',
+        role: 'assistant',
+        content: [{ type: 'refusal', refusal: 'I cannot do that.' }],
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      { role: 'assistant', content: [{ type: 'text', text: 'I cannot do that.' }] },
+    ]);
+  });
+
+  // ── input_image content blocks ─────────────────────────────────────
+  it('converts input_image blocks to image_url blocks', () => {
+    const input: InputItem[] = [
+      {
+        type: 'message',
+        role: 'user',
+        content: [
+          { type: 'input_image', image_url: 'https://example.com/img.png', detail: 'high' },
+        ],
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      {
+        role: 'user',
+        content: [
+          {
+            type: 'image_url',
+            image_url: { url: 'https://example.com/img.png', detail: 'high' },
+          },
+        ],
+      },
+    ]);
+  });
+
+  // ── input_file content blocks ──────────────────────────────────────
+  it('converts input_file blocks to text placeholders', () => {
+    const input: InputItem[] = [
+      {
+        type: 'message',
+        role: 'user',
+        content: [{ type: 'input_file', filename: 'report.pdf', file_id: 'f_123' }],
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      { role: 'user', content: [{ type: 'text', text: '[File: report.pdf]' }] },
+    ]);
+  });
+
+  it('uses "unknown" for input_file without filename', () => {
+    const input: InputItem[] = [
+      {
+        type: 'message',
+        role: 'user',
+        content: [{ type: 'input_file', file_id: 'f_123' }],
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      { role: 'user', content: [{ type: 'text', text: '[File: unknown]' }] },
+    ]);
+  });
+
+  // ── Null / undefined filtering ─────────────────────────────────────
+  it('filters out null elements in content arrays', () => {
+    const input = [
+      {
+        type: 'message',
+        role: 'user',
+        content: [null, { type: 'input_text', text: 'valid' }, undefined],
+      },
+    ] as unknown as InputItem[];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'user', content: [{ type: 'text', text: 'valid' }] }]);
+  });
+
+  // ── Missing text field defaults to empty string ────────────────────
+  it('defaults to empty string when text field is missing on input_text', () => {
+    const input = [
+      {
+        type: 'message',
+        role: 'user',
+        content: [{ type: 'input_text' }],
+      },
+    ] as unknown as InputItem[];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'user', content: [{ type: 'text', text: '' }] }]);
+  });
+
+  it('defaults to empty string when text field is missing on output_text', () => {
+    const input = [
+      {
+        type: 'message',
+        role: 'assistant',
+        content: [{ type: 'output_text' }],
+      },
+    ] as unknown as InputItem[];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'assistant', content: [{ type: 'text', text: '' }] }]);
+  });
+
+  it('defaults to empty string when refusal field is missing on refusal block', () => {
+    const input = [
+      {
+        type: 'message',
+        role: 'assistant',
+        content: [{ type: 'refusal' }],
+      },
+    ] as unknown as InputItem[];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'assistant', content: [{ type: 'text', text: '' }] }]);
+  });
+
+  // ── Unknown block types are filtered out ───────────────────────────
+  it('filters out unknown content block types', () => {
+    const input = [
+      {
+        type: 'message',
+        role: 'user',
+        content: [
+          { type: 'input_text', text: 'keep me' },
+          { type: 'some_future_type', data: 'ignore' },
+        ],
+      },
+    ] as unknown as InputItem[];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'user', content: [{ type: 'text', text: 'keep me' }] }]);
+  });
+
+  // ── Mixed valid/invalid content in same array ──────────────────────
+  it('handles mixed valid and invalid content blocks', () => {
+    const input = [
+      {
+        type: 'message',
+        role: 'assistant',
+        content: [
+          { type: 'output_text', text: 'Hello', annotations: [], logprobs: [] },
+          null,
+          { type: 'unknown_type' },
+          { type: 'refusal', refusal: 'No can do' },
+        ],
+      },
+    ] as unknown as InputItem[];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      {
+        role: 'assistant',
+        content: [
+          { type: 'text', text: 'Hello' },
+          { type: 'text', text: 'No can do' },
+        ],
+      },
+    ]);
+  });
+
+  // ── Non-array, non-string content defaults to empty string ─────────
+  it('defaults to empty string for non-array non-string content', () => {
+    const input = [{ type: 'message', role: 'user', content: 42 }] as unknown as InputItem[];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'user', content: '' }]);
+  });
+
+  // ── Function call items ────────────────────────────────────────────
+  it('converts function_call items to assistant messages with tool_calls', () => {
+    const input: InputItem[] = [
+      {
+        type: 'function_call',
+        id: 'fc_1',
+        call_id: 'call_abc',
+        name: 'get_weather',
+        arguments: '{"city":"NYC"}',
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      {
+        role: 'assistant',
+        content: '',
+        tool_calls: [
+          {
+            id: 'call_abc',
+            type: 'function',
+            function: { name: 'get_weather', arguments: '{"city":"NYC"}' },
+          },
+        ],
+      },
+    ]);
+  });
+
+  // ── Function call output items ─────────────────────────────────────
+  it('converts function_call_output items to tool messages', () => {
+    const input: InputItem[] = [
+      {
+        type: 'function_call_output',
+        call_id: 'call_abc',
+        output: '{"temp":72}',
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      {
+        role: 'tool',
+        content: '{"temp":72}',
+        tool_call_id: 'call_abc',
+      },
+    ]);
+  });
+
+  // ── Item references are skipped ────────────────────────────────────
+  it('skips item_reference items', () => {
+    const input: InputItem[] = [
+      { type: 'item_reference', id: 'ref_123' },
+      { type: 'message', role: 'user', content: 'Hello' },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([{ role: 'user', content: 'Hello' }]);
+  });
+
+  // ── Multi-turn conversation (the real-world scenario) ──────────────
+  it('handles a full multi-turn conversation with output_text blocks', () => {
+    const input: InputItem[] = [
+      {
+        type: 'message',
+        role: 'developer',
+        content: [{ type: 'input_text', text: 'You are a helpful assistant.' }],
+      },
+      {
+        type: 'message',
+        role: 'user',
+        content: [{ type: 'input_text', text: 'What is 2+2?' }],
+      },
+      {
+        type: 'message',
+        role: 'assistant',
+        content: [{ type: 'output_text', text: '2+2 is 4.', annotations: [], logprobs: [] }],
+      },
+      {
+        type: 'message',
+        role: 'user',
+        content: [{ type: 'input_text', text: 'And 3+3?' }],
+      },
+    ];
+    const result = convertInputToMessages(input);
+    expect(result).toEqual([
+      { role: 'system', content: [{ type: 'text', text: 'You are a helpful assistant.' }] },
+      { role: 'user', content: [{ type: 'text', text: 'What is 2+2?' }] },
+      { role: 'assistant', content: [{ type: 'text', text: '2+2 is 4.' }] },
+      { role: 'user', content: [{ type: 'text', text: 'And 3+3?' }] },
+    ]);
+  });
+});
diff --git a/packages/api/src/agents/responses/handlers.ts b/packages/api/src/agents/responses/handlers.ts
new file mode 100644
index 0000000000..712be852bd
--- /dev/null
+++ b/packages/api/src/agents/responses/handlers.ts
@@ -0,0 +1,914 @@
+/**
+ * Open Responses API Handlers
+ *
+ * Semantic event emitters and response tracking for the Open Responses API.
+ * Events follow the Open Responses spec with proper lifecycle management.
+ */
+import type { Response as ServerResponse } from 'express';
+import type {
+  Response,
+  ResponseContext,
+  ResponseEvent,
+  OutputItem,
+  MessageItem,
+  FunctionCallItem,
+  FunctionCallOutputItem,
+  ReasoningItem,
+  OutputTextContent,
+  ReasoningTextContent,
+  ItemStatus,
+  ResponseStatus,
+} from './types';
+
+/* =============================================================================
+ * RESPONSE TRACKER
+ * ============================================================================= */
+
+/**
+ * Tracks the state of a response during streaming.
+ * Manages items, sequence numbers, and accumulated content.
+ */
+export interface ResponseTracker {
+  /** Current sequence number (monotonically increasing) */
+  sequenceNumber: number;
+  /** Output items being built */
+  items: OutputItem[];
+  /** Current message item (if any) */
+  currentMessage: MessageItem | null;
+  /** Current message content index */
+  currentContentIndex: number;
+  /** Current reasoning item (if any) */
+  currentReasoning: ReasoningItem | null;
+  /** Current reasoning content index */
+  currentReasoningContentIndex: number;
+  /** Map of function call items by call_id */
+  functionCalls: Map<string, FunctionCallItem>;
+  /** Map of function call outputs by call_id */
+  functionCallOutputs: Map<string, FunctionCallOutputItem>;
+  /** Accumulated text for current message */
+  accumulatedText: string;
+  /** Accumulated reasoning text */
+  accumulatedReasoningText: string;
+  /** Accumulated function call arguments by call_id */
+  accumulatedArguments: Map<string, string>;
+  /** Token usage */
+  usage: {
+    inputTokens: number;
+    outputTokens: number;
+    reasoningTokens: number;
+    cachedTokens: number;
+  };
+  /** Response status */
+  status: ResponseStatus;
+  /** Get next sequence number */
+  nextSequence: () => number;
+}
+
+/**
+ * Create a new response tracker
+ */
+export function createResponseTracker(): ResponseTracker {
+  const tracker: ResponseTracker = {
+    sequenceNumber: 0,
+    items: [],
+    currentMessage: null,
+    currentContentIndex: 0,
+    currentReasoning: null,
+    currentReasoningContentIndex: 0,
+    functionCalls: new Map(),
+    functionCallOutputs: new Map(),
+    accumulatedText: '',
+    accumulatedReasoningText: '',
+    accumulatedArguments: new Map(),
+    usage: {
+      inputTokens: 0,
+      outputTokens: 0,
+      reasoningTokens: 0,
+      cachedTokens: 0,
+    },
+    status: 'in_progress',
+    nextSequence: () => tracker.sequenceNumber++,
+  };
+  return tracker;
+}
+
+/* =============================================================================
+ * SSE EVENT WRITING
+ * ============================================================================= */
+
+/**
+ * Write a semantic SSE event to the response.
+ * The `event:` field matches the `type` in the data payload.
+ */
+export function writeEvent(res: ServerResponse, event: ResponseEvent): void {
+  res.write(`event: ${event.type}\n`);
+  res.write(`data: ${JSON.stringify(event)}\n\n`);
+}
+
+/**
+ * Write the terminal [DONE] event
+ */
+export function writeDone(res: ServerResponse): void {
+  res.write('data: [DONE]\n\n');
+}
+
+/* =============================================================================
+ * RESPONSE BUILDING
+ * ============================================================================= */
+
+/**
+ * Build a Response object from context and tracker
+ * Includes all required fields per Open Responses spec
+ */
+export function buildResponse(
+  context: ResponseContext,
+  tracker: ResponseTracker,
+  status: ResponseStatus = 'in_progress',
+): Response {
+  const isCompleted = status === 'completed';
+
+  return {
+    // Required fields
+    id: context.responseId,
+    object: 'response',
+    created_at: context.createdAt,
+    completed_at: isCompleted ? Math.floor(Date.now() / 1000) : null,
+    status,
+    incomplete_details: null,
+    model: context.model,
+    previous_response_id: context.previousResponseId ?? null,
+    instructions: context.instructions ?? null,
+    output: tracker.items,
+    error: null,
+    tools: [],
+    tool_choice: 'auto',
+    truncation: 'disabled',
+    parallel_tool_calls: true,
+    text: { format: { type: 'text' } },
+    temperature: 1,
+    top_p: 1,
+    presence_penalty: 0,
+    frequency_penalty: 0,
+    top_logprobs: 0,
+    reasoning: null,
+    user: null,
+    usage: isCompleted
+      ? {
+          input_tokens: tracker.usage.inputTokens,
+          output_tokens: tracker.usage.outputTokens,
+          total_tokens: tracker.usage.inputTokens + tracker.usage.outputTokens,
+          input_tokens_details: { cached_tokens: tracker.usage.cachedTokens },
+          output_tokens_details: { reasoning_tokens: tracker.usage.reasoningTokens },
+        }
+      : null,
+    max_output_tokens: null,
+    max_tool_calls: null,
+    store: false,
+    background: false,
+    service_tier: 'default',
+    metadata: {},
+    safety_identifier: null,
+    prompt_cache_key: null,
+  };
+}
+
+/* =============================================================================
+ * ITEM BUILDERS
+ * ============================================================================= */
+
+let itemIdCounter = 0;
+
+/**
+ * Generate a unique item ID
+ */
+export function generateItemId(prefix: string): string {
+  return `${prefix}_${Date.now().toString(36)}${(itemIdCounter++).toString(36)}`;
+}
+
+/**
+ * Create a new message item
+ */
+export function createMessageItem(status: ItemStatus = 'in_progress'): MessageItem {
+  return {
+    type: 'message',
+    id: generateItemId('msg'),
+    role: 'assistant',
+    status,
+    content: [],
+  };
+}
+
+/**
+ * Create a new function call item
+ */
+export function createFunctionCallItem(
+  callId: string,
+  name: string,
+  status: ItemStatus = 'in_progress',
+): FunctionCallItem {
+  return {
+    type: 'function_call',
+    id: generateItemId('fc'),
+    call_id: callId,
+    name,
+    arguments: '',
+    status,
+  };
+}
+
+/**
+ * Create a new function call output item
+ */
+export function createFunctionCallOutputItem(
+  callId: string,
+  output: string,
+  status: ItemStatus = 'completed',
+): FunctionCallOutputItem {
+  return {
+    type: 'function_call_output',
+    id: generateItemId('fco'),
+    call_id: callId,
+    output,
+    status,
+  };
+}
+
+/**
+ * Create a new reasoning item
+ */
+export function createReasoningItem(status: ItemStatus = 'in_progress'): ReasoningItem {
+  return {
+    type: 'reasoning',
+    id: generateItemId('reason'),
+    status,
+    content: [],
+    summary: [],
+  };
+}
+
+/**
+ * Create output text content
+ */
+export function createOutputTextContent(text: string = ''): OutputTextContent {
+  return {
+    type: 'output_text',
+    text,
+    annotations: [],
+    logprobs: [],
+  };
+}
+
+/**
+ * Create reasoning text content
+ */
+export function createReasoningTextContent(text: string = ''): ReasoningTextContent {
+  return {
+    type: 'reasoning_text',
+    text,
+  };
+}
+
+/* =============================================================================
+ * STREAMING EVENT EMITTERS
+ * ============================================================================= */
+
+export interface StreamHandlerConfig {
+  res: ServerResponse;
+  context: ResponseContext;
+  tracker: ResponseTracker;
+}
+
+/**
+ * Emit response.created event
+ * This is the first event emitted per the Open Responses spec
+ */
+export function emitResponseCreated(config: StreamHandlerConfig): void {
+  const { res, context, tracker } = config;
+  const response = buildResponse(context, tracker, 'in_progress');
+  writeEvent(res, {
+    type: 'response.created',
+    sequence_number: tracker.nextSequence(),
+    response,
+  });
+}
+
+/**
+ * Emit response.in_progress event
+ */
+export function emitResponseInProgress(config: StreamHandlerConfig): void {
+  const { res, context, tracker } = config;
+  const response = buildResponse(context, tracker, 'in_progress');
+  writeEvent(res, {
+    type: 'response.in_progress',
+    sequence_number: tracker.nextSequence(),
+    response,
+  });
+}
+
+/**
+ * Emit response.completed event
+ */
+export function emitResponseCompleted(config: StreamHandlerConfig): void {
+  const { res, context, tracker } = config;
+  tracker.status = 'completed';
+  const response = buildResponse(context, tracker, 'completed');
+  writeEvent(res, {
+    type: 'response.completed',
+    sequence_number: tracker.nextSequence(),
+    response,
+  });
+}
+
+/**
+ * Emit response.failed event
+ */
+export function emitResponseFailed(
+  config: StreamHandlerConfig,
+  error: { type: string; message: string; code?: string },
+): void {
+  const { res, context, tracker } = config;
+  tracker.status = 'failed';
+  const response = buildResponse(context, tracker, 'failed');
+  response.error = {
+    type: error.type as
+      | 'server_error'
+      | 'invalid_request'
+      | 'not_found'
+      | 'model_error'
+      | 'too_many_requests',
+    message: error.message,
+    code: error.code,
+  };
+  writeEvent(res, {
+    type: 'response.failed',
+    sequence_number: tracker.nextSequence(),
+    response,
+  });
+}
+
+/**
+ * Emit response.output_item.added event for a message
+ */
+export function emitMessageItemAdded(config: StreamHandlerConfig): MessageItem {
+  const { res, tracker } = config;
+  const item = createMessageItem('in_progress');
+  tracker.currentMessage = item;
+  tracker.currentContentIndex = 0;
+  tracker.accumulatedText = '';
+  tracker.items.push(item);
+
+  writeEvent(res, {
+    type: 'response.output_item.added',
+    sequence_number: tracker.nextSequence(),
+    output_index: tracker.items.length - 1,
+    item,
+  });
+
+  return item;
+}
+
+/**
+ * Emit response.output_item.done event for a message
+ */
+export function emitMessageItemDone(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentMessage) {
+    return;
+  }
+
+  tracker.currentMessage.status = 'completed';
+  const outputIndex = tracker.items.indexOf(tracker.currentMessage);
+
+  writeEvent(res, {
+    type: 'response.output_item.done',
+    sequence_number: tracker.nextSequence(),
+    output_index: outputIndex,
+    item: tracker.currentMessage,
+  });
+
+  tracker.currentMessage = null;
+}
+
+/**
+ * Emit response.content_part.added for text content
+ */
+export function emitTextContentPartAdded(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentMessage) {
+    return;
+  }
+
+  const part = createOutputTextContent('');
+  tracker.currentMessage.content.push(part);
+  const outputIndex = tracker.items.indexOf(tracker.currentMessage);
+
+  writeEvent(res, {
+    type: 'response.content_part.added',
+    sequence_number: tracker.nextSequence(),
+    item_id: tracker.currentMessage.id,
+    output_index: outputIndex,
+    content_index: tracker.currentContentIndex,
+    part,
+  });
+}
+
+/**
+ * Emit response.output_text.delta event
+ */
+export function emitOutputTextDelta(config: StreamHandlerConfig, delta: string): void {
+  const { res, tracker } = config;
+  if (!tracker.currentMessage) {
+    return;
+  }
+
+  tracker.accumulatedText += delta;
+  const outputIndex = tracker.items.indexOf(tracker.currentMessage);
+
+  writeEvent(res, {
+    type: 'response.output_text.delta',
+    sequence_number: tracker.nextSequence(),
+    item_id: tracker.currentMessage.id,
+    output_index: outputIndex,
+    content_index: tracker.currentContentIndex,
+    delta,
+    logprobs: [],
+  });
+}
+
+/**
+ * Emit response.output_text.done event
+ */
+export function emitOutputTextDone(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentMessage) {
+    return;
+  }
+
+  const outputIndex = tracker.items.indexOf(tracker.currentMessage);
+  const contentIndex = tracker.currentContentIndex;
+
+  // Update the content part with final text
+  if (tracker.currentMessage.content[contentIndex]) {
+    (tracker.currentMessage.content[contentIndex] as OutputTextContent).text =
+      tracker.accumulatedText;
+  }
+
+  writeEvent(res, {
+    type: 'response.output_text.done',
+    sequence_number: tracker.nextSequence(),
+    item_id: tracker.currentMessage.id,
+    output_index: outputIndex,
+    content_index: contentIndex,
+    text: tracker.accumulatedText,
+    logprobs: [],
+  });
+}
+
+/**
+ * Emit response.content_part.done for text content
+ */
+export function emitTextContentPartDone(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentMessage) {
+    return;
+  }
+
+  const outputIndex = tracker.items.indexOf(tracker.currentMessage);
+  const contentIndex = tracker.currentContentIndex;
+  const part = tracker.currentMessage.content[contentIndex];
+
+  if (part) {
+    writeEvent(res, {
+      type: 'response.content_part.done',
+      sequence_number: tracker.nextSequence(),
+      item_id: tracker.currentMessage.id,
+      output_index: outputIndex,
+      content_index: contentIndex,
+      part,
+    });
+  }
+
+  tracker.currentContentIndex++;
+}
+
+/* =============================================================================
+ * FUNCTION CALL EVENT EMITTERS
+ * ============================================================================= */
+
+/**
+ * Emit response.output_item.added for a function call
+ */
+export function emitFunctionCallItemAdded(
+  config: StreamHandlerConfig,
+  callId: string,
+  name: string,
+): FunctionCallItem {
+  const { res, tracker } = config;
+  const item = createFunctionCallItem(callId, name, 'in_progress');
+  tracker.functionCalls.set(callId, item);
+  tracker.accumulatedArguments.set(callId, '');
+  tracker.items.push(item);
+
+  writeEvent(res, {
+    type: 'response.output_item.added',
+    sequence_number: tracker.nextSequence(),
+    output_index: tracker.items.length - 1,
+    item,
+  });
+
+  return item;
+}
+
+/**
+ * Emit response.function_call_arguments.delta event
+ */
+export function emitFunctionCallArgumentsDelta(
+  config: StreamHandlerConfig,
+  callId: string,
+  delta: string,
+): void {
+  const { res, tracker } = config;
+  const item = tracker.functionCalls.get(callId);
+  if (!item) {
+    return;
+  }
+
+  const accumulated = (tracker.accumulatedArguments.get(callId) ?? '') + delta;
+  tracker.accumulatedArguments.set(callId, accumulated);
+  item.arguments = accumulated;
+
+  const outputIndex = tracker.items.indexOf(item);
+
+  writeEvent(res, {
+    type: 'response.function_call_arguments.delta',
+    sequence_number: tracker.nextSequence(),
+    item_id: item.id,
+    output_index: outputIndex,
+    call_id: callId,
+    delta,
+  });
+}
+
+/**
+ * Emit response.function_call_arguments.done event
+ */
+export function emitFunctionCallArgumentsDone(config: StreamHandlerConfig, callId: string): void {
+  const { res, tracker } = config;
+  const item = tracker.functionCalls.get(callId);
+  if (!item) {
+    return;
+  }
+
+  const outputIndex = tracker.items.indexOf(item);
+  const args = tracker.accumulatedArguments.get(callId) ?? '';
+
+  writeEvent(res, {
+    type: 'response.function_call_arguments.done',
+    sequence_number: tracker.nextSequence(),
+    item_id: item.id,
+    output_index: outputIndex,
+    call_id: callId,
+    arguments: args,
+  });
+}
+
+/**
+ * Emit response.output_item.done for a function call
+ */
+export function emitFunctionCallItemDone(config: StreamHandlerConfig, callId: string): void {
+  const { res, tracker } = config;
+  const item = tracker.functionCalls.get(callId);
+  if (!item) {
+    return;
+  }
+
+  item.status = 'completed';
+  const outputIndex = tracker.items.indexOf(item);
+
+  writeEvent(res, {
+    type: 'response.output_item.done',
+    sequence_number: tracker.nextSequence(),
+    output_index: outputIndex,
+    item,
+  });
+}
+
+/**
+ * Emit function call output item (internal tool result)
+ */
+export function emitFunctionCallOutputItem(
+  config: StreamHandlerConfig,
+  callId: string,
+  output: string,
+): void {
+  const { res, tracker } = config;
+  const item = createFunctionCallOutputItem(callId, output, 'completed');
+  tracker.functionCallOutputs.set(callId, item);
+  tracker.items.push(item);
+
+  // Emit added
+  writeEvent(res, {
+    type: 'response.output_item.added',
+    sequence_number: tracker.nextSequence(),
+    output_index: tracker.items.length - 1,
+    item,
+  });
+
+  // Immediately emit done since it's already complete
+  writeEvent(res, {
+    type: 'response.output_item.done',
+    sequence_number: tracker.nextSequence(),
+    output_index: tracker.items.length - 1,
+    item,
+  });
+}
+
+/* =============================================================================
+ * REASONING EVENT EMITTERS
+ * ============================================================================= */
+
+/**
+ * Emit response.output_item.added for reasoning
+ */
+export function emitReasoningItemAdded(config: StreamHandlerConfig): ReasoningItem {
+  const { res, tracker } = config;
+  const item = createReasoningItem('in_progress');
+  tracker.currentReasoning = item;
+  tracker.currentReasoningContentIndex = 0;
+  tracker.accumulatedReasoningText = '';
+  tracker.items.push(item);
+
+  writeEvent(res, {
+    type: 'response.output_item.added',
+    sequence_number: tracker.nextSequence(),
+    output_index: tracker.items.length - 1,
+    item,
+  });
+
+  return item;
+}
+
+/**
+ * Emit response.content_part.added for reasoning
+ */
+export function emitReasoningContentPartAdded(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentReasoning) {
+    return;
+  }
+
+  const part = createReasoningTextContent('');
+  if (!tracker.currentReasoning.content) {
+    tracker.currentReasoning.content = [];
+  }
+  tracker.currentReasoning.content.push(part);
+  const outputIndex = tracker.items.indexOf(tracker.currentReasoning);
+
+  writeEvent(res, {
+    type: 'response.content_part.added',
+    sequence_number: tracker.nextSequence(),
+    item_id: tracker.currentReasoning.id,
+    output_index: outputIndex,
+    content_index: tracker.currentReasoningContentIndex,
+    part,
+  });
+}
+
+/**
+ * Emit response.reasoning.delta event
+ */
+export function emitReasoningDelta(config: StreamHandlerConfig, delta: string): void {
+  const { res, tracker } = config;
+  if (!tracker.currentReasoning) {
+    return;
+  }
+
+  tracker.accumulatedReasoningText += delta;
+  const outputIndex = tracker.items.indexOf(tracker.currentReasoning);
+
+  writeEvent(res, {
+    type: 'response.reasoning.delta',
+    sequence_number: tracker.nextSequence(),
+    item_id: tracker.currentReasoning.id,
+    output_index: outputIndex,
+    content_index: tracker.currentReasoningContentIndex,
+    delta,
+  });
+}
+
+/**
+ * Emit response.reasoning.done event
+ */
+export function emitReasoningDone(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentReasoning || !tracker.currentReasoning.content) {
+    return;
+  }
+
+  const outputIndex = tracker.items.indexOf(tracker.currentReasoning);
+  const contentIndex = tracker.currentReasoningContentIndex;
+
+  // Update the content part with final text
+  if (tracker.currentReasoning.content[contentIndex]) {
+    (tracker.currentReasoning.content[contentIndex] as ReasoningTextContent).text =
+      tracker.accumulatedReasoningText;
+  }
+
+  writeEvent(res, {
+    type: 'response.reasoning.done',
+    sequence_number: tracker.nextSequence(),
+    item_id: tracker.currentReasoning.id,
+    output_index: outputIndex,
+    content_index: contentIndex,
+    text: tracker.accumulatedReasoningText,
+  });
+}
+
+/**
+ * Emit response.content_part.done for reasoning
+ */
+export function emitReasoningContentPartDone(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentReasoning || !tracker.currentReasoning.content) {
+    return;
+  }
+
+  const outputIndex = tracker.items.indexOf(tracker.currentReasoning);
+  const contentIndex = tracker.currentReasoningContentIndex;
+  const part = tracker.currentReasoning.content[contentIndex];
+
+  if (part) {
+    writeEvent(res, {
+      type: 'response.content_part.done',
+      sequence_number: tracker.nextSequence(),
+      item_id: tracker.currentReasoning.id,
+      output_index: outputIndex,
+      content_index: contentIndex,
+      part,
+    });
+  }
+
+  tracker.currentReasoningContentIndex++;
+}
+
+/**
+ * Emit response.output_item.done for reasoning
+ */
+export function emitReasoningItemDone(config: StreamHandlerConfig): void {
+  const { res, tracker } = config;
+  if (!tracker.currentReasoning) {
+    return;
+  }
+
+  tracker.currentReasoning.status = 'completed';
+  const outputIndex = tracker.items.indexOf(tracker.currentReasoning);
+
+  writeEvent(res, {
+    type: 'response.output_item.done',
+    sequence_number: tracker.nextSequence(),
+    output_index: outputIndex,
+    item: tracker.currentReasoning,
+  });
+
+  tracker.currentReasoning = null;
+}
+
+/* =============================================================================
+ * ERROR HANDLING
+ * ============================================================================= */
+
+/**
+ * Emit error event
+ */
+export function emitError(
+  config: StreamHandlerConfig,
+  error: { type: string; message: string; code?: string },
+): void {
+  const { res, tracker } = config;
+
+  writeEvent(res, {
+    type: 'error',
+    sequence_number: tracker.nextSequence(),
+    error: {
+      type: error.type as 'server_error',
+      message: error.message,
+      code: error.code,
+    },
+  });
+}
+
+/* =============================================================================
+ * LIBRECHAT EXTENSION EVENTS
+ * Custom events prefixed with 'librechat:' per Open Responses spec
+ * @see https://openresponses.org/specification#extending-streaming-events
+ * ============================================================================= */
+
+/**
+ * Attachment data for librechat:attachment events
+ */
+export interface AttachmentData {
+  /** File ID in LibreChat storage */
+  file_id?: string;
+  /** Original filename */
+  filename?: string;
+  /** MIME type */
+  type?: string;
+  /** URL to access the file */
+  url?: string;
+  /** Base64-encoded image data (for inline images) */
+  image_url?: string;
+  /** Width for images */
+  width?: number;
+  /** Height for images */
+  height?: number;
+  /** Associated tool call ID */
+  tool_call_id?: string;
+  /** Additional metadata */
+  [key: string]: unknown;
+}
+
+/**
+ * Emit librechat:attachment event for file/image attachments
+ * This is a LibreChat extension to the Open Responses streaming protocol.
+ * External clients can safely ignore these events.
+ */
+export function emitAttachment(
+  config: StreamHandlerConfig,
+  attachment: AttachmentData,
+  options?: {
+    messageId?: string;
+    conversationId?: string;
+  },
+): void {
+  const { res, tracker } = config;
+
+  writeEvent(res, {
+    type: 'librechat:attachment',
+    sequence_number: tracker.nextSequence(),
+    attachment,
+    message_id: options?.messageId,
+    conversation_id: options?.conversationId,
+  });
+}
+
+/**
+ * Write attachment event directly to response (for use outside streaming context)
+ * Useful when attachment processing happens asynchronously
+ */
+export function writeAttachmentEvent(
+  res: ServerResponse,
+  sequenceNumber: number,
+  attachment: AttachmentData,
+  options?: {
+    messageId?: string;
+    conversationId?: string;
+  },
+): void {
+  writeEvent(res, {
+    type: 'librechat:attachment',
+    sequence_number: sequenceNumber,
+    attachment,
+    message_id: options?.messageId,
+    conversation_id: options?.conversationId,
+  });
+}
+
+/* =============================================================================
+ * NON-STREAMING RESPONSE BUILDER
+ * ============================================================================= */
+
+/**
+ * Build a complete non-streaming response
+ */
+export function buildResponsesNonStreamingResponse(
+  context: ResponseContext,
+  tracker: ResponseTracker,
+): Response {
+  return buildResponse(context, tracker, 'completed');
+}
+
+/**
+ * Update tracker usage from collected data
+ */
+export function updateTrackerUsage(
+  tracker: ResponseTracker,
+  usage: {
+    promptTokens?: number;
+    completionTokens?: number;
+    reasoningTokens?: number;
+    cachedTokens?: number;
+  },
+): void {
+  if (usage.promptTokens != null) {
+    tracker.usage.inputTokens = usage.promptTokens;
+  }
+  if (usage.completionTokens != null) {
+    tracker.usage.outputTokens = usage.completionTokens;
+  }
+  if (usage.reasoningTokens != null) {
+    tracker.usage.reasoningTokens = usage.reasoningTokens;
+  }
+  if (usage.cachedTokens != null) {
+    tracker.usage.cachedTokens = usage.cachedTokens;
+  }
+}
diff --git a/packages/api/src/agents/responses/index.ts b/packages/api/src/agents/responses/index.ts
new file mode 100644
index 0000000000..ecfb1c2047
--- /dev/null
+++ b/packages/api/src/agents/responses/index.ts
@@ -0,0 +1,183 @@
+/**
+ * Open Responses API Module
+ *
+ * Exports for the Open Responses API implementation.
+ * @see https://openresponses.org/specification
+ */
+
+// Types
+export type {
+  // Enums
+  ItemStatus,
+  ResponseStatus,
+  MessageRole,
+  ToolChoiceValue,
+  TruncationValue,
+  ServiceTier,
+  ReasoningEffort,
+  ReasoningSummary,
+  // Input content
+  InputTextContent,
+  InputImageContent,
+  InputFileContent,
+  InputContent,
+  // Output content
+  LogProb,
+  TopLogProb,
+  OutputTextContent,
+  RefusalContent,
+  ModelContent,
+  // Annotations
+  UrlCitationAnnotation,
+  FileCitationAnnotation,
+  Annotation,
+  // Reasoning content
+  ReasoningTextContent,
+  SummaryTextContent,
+  ReasoningContent,
+  // Input items
+  SystemMessageItemParam,
+  DeveloperMessageItemParam,
+  UserMessageItemParam,
+  AssistantMessageItemParam,
+  FunctionCallItemParam,
+  FunctionCallOutputItemParam,
+  ReasoningItemParam,
+  ItemReferenceParam,
+  InputItem,
+  // Output items
+  MessageItem,
+  FunctionCallItem,
+  FunctionCallOutputItem,
+  ReasoningItem,
+  OutputItem,
+  // Tools
+  FunctionTool,
+  HostedTool,
+  Tool,
+  FunctionToolChoice,
+  ToolChoice,
+  // Request
+  ReasoningConfig,
+  TextConfig,
+  StreamOptions,
+  Metadata,
+  ResponseRequest,
+  // Response field types
+  TextField,
+  // Response
+  InputTokensDetails,
+  OutputTokensDetails,
+  Usage,
+  IncompleteDetails,
+  ResponseError,
+  Response,
+  // Streaming events
+  BaseEvent,
+  ResponseCreatedEvent,
+  ResponseInProgressEvent,
+  ResponseCompletedEvent,
+  ResponseFailedEvent,
+  ResponseIncompleteEvent,
+  OutputItemAddedEvent,
+  OutputItemDoneEvent,
+  ContentPartAddedEvent,
+  ContentPartDoneEvent,
+  OutputTextDeltaEvent,
+  OutputTextDoneEvent,
+  RefusalDeltaEvent,
+  RefusalDoneEvent,
+  FunctionCallArgumentsDeltaEvent,
+  FunctionCallArgumentsDoneEvent,
+  ReasoningDeltaEvent,
+  ReasoningDoneEvent,
+  ErrorEvent,
+  ResponseEvent,
+  // LibreChat extensions
+  LibreChatAttachmentContent,
+  LibreChatAttachmentEvent,
+  // Internal
+  ResponseContext,
+  RequestValidationResult,
+} from './types';
+
+// Handlers
+export {
+  // Tracker
+  createResponseTracker,
+  type ResponseTracker,
+  // SSE
+  writeEvent,
+  writeDone,
+  // Response building
+  buildResponse,
+  // Item builders
+  generateItemId,
+  createMessageItem,
+  createFunctionCallItem,
+  createFunctionCallOutputItem,
+  createReasoningItem,
+  createOutputTextContent,
+  createReasoningTextContent,
+  // Stream config
+  type StreamHandlerConfig,
+  // Response events
+  emitResponseCreated,
+  emitResponseInProgress,
+  emitResponseCompleted,
+  emitResponseFailed,
+  // Message events
+  emitMessageItemAdded,
+  emitMessageItemDone,
+  emitTextContentPartAdded,
+  emitOutputTextDelta,
+  emitOutputTextDone,
+  emitTextContentPartDone,
+  // Function call events
+  emitFunctionCallItemAdded,
+  emitFunctionCallArgumentsDelta,
+  emitFunctionCallArgumentsDone,
+  emitFunctionCallItemDone,
+  emitFunctionCallOutputItem,
+  // Reasoning events
+  emitReasoningItemAdded,
+  emitReasoningContentPartAdded,
+  emitReasoningDelta,
+  emitReasoningDone,
+  emitReasoningContentPartDone,
+  emitReasoningItemDone,
+  // Error events
+  emitError,
+  // LibreChat extension events
+  emitAttachment,
+  writeAttachmentEvent,
+  type AttachmentData,
+  // Non-streaming
+  buildResponsesNonStreamingResponse,
+  updateTrackerUsage,
+} from './handlers';
+
+// Service
+export {
+  // Validation
+  validateResponseRequest,
+  isValidationFailure,
+  // Input conversion
+  convertInputToMessages,
+  mergeMessagesWithInput,
+  type InternalMessage,
+  // Error response
+  sendResponsesErrorResponse,
+  // Context
+  generateResponseId,
+  createResponseContext,
+  // Streaming setup
+  setupStreamingResponse,
+  // Event handlers
+  createResponsesEventHandlers,
+  // Non-streaming
+  createResponseAggregator,
+  buildAggregatedResponse,
+  createAggregatorEventHandlers,
+  type ResponseAggregator,
+} from './service';
diff --git a/packages/api/src/agents/responses/service.ts b/packages/api/src/agents/responses/service.ts
new file mode 100644
index 0000000000..2e49b1b979
--- /dev/null
+++ b/packages/api/src/agents/responses/service.ts
@@ -0,0 +1,880 @@
+/**
+ * Open Responses API Service
+ *
+ * Core service for processing Open Responses API requests.
+ * Handles input conversion, message formatting, and request validation.
+ */
+import type { Response as ServerResponse } from 'express';
+import type {
+  RequestValidationResult,
+  ResponseRequest,
+  ResponseContext,
+  InputContent,
+  ModelContent,
+  InputItem,
+  Response,
+} from './types';
+import {
+  writeDone,
+  emitResponseCompleted,
+  emitMessageItemAdded,
+  emitMessageItemDone,
+  emitTextContentPartAdded,
+  emitOutputTextDelta,
+  emitOutputTextDone,
+  emitTextContentPartDone,
+  emitFunctionCallItemAdded,
+  emitFunctionCallArgumentsDelta,
+  emitFunctionCallArgumentsDone,
+  emitFunctionCallItemDone,
+  emitFunctionCallOutputItem,
+  emitReasoningItemAdded,
+  emitReasoningContentPartAdded,
+  emitReasoningDelta,
+  emitReasoningDone,
+  emitReasoningContentPartDone,
+  emitReasoningItemDone,
+  updateTrackerUsage,
+  type StreamHandlerConfig,
+} from './handlers';
+
+/* =============================================================================
+ * REQUEST VALIDATION
+ * ============================================================================= */
+
+/**
+ * Validate a request body
+ */
+export function validateResponseRequest(body: unknown): RequestValidationResult {
+  if (!body || typeof body !== 'object') {
+    return { valid: false, error: 'Request body is required' };
+  }
+
+  const request = body as Record<string, unknown>;
+
+  // Required: model
+  if (!request.model || typeof request.model !== 'string') {
+    return { valid: false, error: 'model is required and must be a string' };
+  }
+
+  // Required: input (string or array)
+  if (request.input === undefined || request.input === null) {
+    return { valid: false, error: 'input is required' };
+  }
+
+  if (typeof request.input !== 'string' && !Array.isArray(request.input)) {
+    return { valid: false, error: 'input must be a string or array of items' };
+  }
+
+  // Optional validations
+  if (request.stream !== undefined && typeof request.stream !== 'boolean') {
+    return { valid: false, error: 'stream must be a boolean' };
+  }
+
+  if (request.temperature !== undefined) {
+    const temp = request.temperature as number;
+    if (typeof temp !== 'number' || temp < 0 || temp > 2) {
+      return { valid: false, error: 'temperature must be a number between 0 and 2' };
+    }
+  }
+
+  if (request.max_output_tokens !== undefined) {
+    if (typeof request.max_output_tokens !== 'number' || request.max_output_tokens < 1) {
+      return { valid: false, error: 'max_output_tokens must be a positive number' };
+    }
+  }
+
+  return { valid: true, request: request as unknown as ResponseRequest };
+}
+
+/**
+ * Check if validation failed
+ */
+export function isValidationFailure(
+  result: RequestValidationResult,
+): result is { valid: false; error: string } {
+  return !result.valid;
+}
+
+/* =============================================================================
+ * INPUT CONVERSION
+ * ============================================================================= */
+
+/** Internal message format (LibreChat-compatible) */
+export interface InternalMessage {
+  role: 'system' | 'user' | 'assistant' | 'tool';
+  content: string | Array<{ type: string; text?: string; image_url?: unknown }>;
+  name?: string;
+  tool_call_id?: string;
+  tool_calls?: Array<{
+    id: string;
+    type: 'function';
+    function: { name: string; arguments: string };
+  }>;
+}
+
+/**
+ * Convert Open Responses input to internal message format.
+ * Handles both string input and array of items.
+ */
+export function convertInputToMessages(input: string | InputItem[]): InternalMessage[] {
+  // Simple string input becomes a user message
+  if (typeof input === 'string') {
+    return [{ role: 'user', content: input }];
+  }
+
+  const messages: InternalMessage[] = [];
+
+  for (const item of input) {
+    if (item.type === 'item_reference') {
+      // Skip item references - they're handled by previous_response_id
+      continue;
+    }
+
+    if (item.type === 'message') {
+      const messageItem = item as {
+        type: 'message';
+        role: string;
+        content: string | (InputContent | ModelContent)[];
+      };
+
+      let content: InternalMessage['content'];
+
+      if (typeof messageItem.content === 'string') {
+        content = messageItem.content;
+      } else if (Array.isArray(messageItem.content)) {
+        content = messageItem.content
+          .filter((part): part is InputContent | ModelContent => part != null)
+          .map((part) => {
+            if (part.type === 'input_text' || part.type === 'output_text') {
+              return { type: 'text', text: (part as { text?: string }).text ?? '' };
+            }
+            if (part.type === 'refusal') {
+              return { type: 'text', text: (part as { refusal?: string }).refusal ?? '' };
+            }
+            if (part.type === 'input_image') {
+              return {
+                type: 'image_url',
+                image_url: {
+                  url: (part as { image_url?: string }).image_url,
+                  detail: (part as { detail?: string }).detail,
+                },
+              };
+            }
+            if (part.type === 'input_file') {
+              const filePart = part as { filename?: string };
+              return { type: 'text', text: `[File: ${filePart.filename ?? 'unknown'}]` };
+            }
+            return null;
+          })
+          .filter((part): part is NonNullable<typeof part> => part != null);
+      } else {
+        content = '';
+      }
+
+      // Map developer role to system (LibreChat convention)
+      let role: InternalMessage['role'];
+      if (messageItem.role === 'developer') {
+        role = 'system';
+      } else if (messageItem.role === 'user') {
+        role = 'user';
+      } else if (messageItem.role === 'assistant') {
+        role = 'assistant';
+      } else if (messageItem.role === 'system') {
+        role = 'system';
+      } else {
+        role = 'user';
+      }
+
+      messages.push({ role, content });
+    }
+
+    if (item.type === 'function_call') {
+      // Function call items represent prior tool calls from assistant
+      const fcItem = item as {
+        type: 'function_call';
+        call_id: string;
+        name: string;
+        arguments: string;
+      };
+
+      // Add as assistant message with tool_calls
+      messages.push({
+        role: 'assistant',
+        content: '',
+        tool_calls: [
+          {
+            id: fcItem.call_id,
+            type: 'function',
+            function: { name: fcItem.name, arguments: fcItem.arguments },
+          },
+        ],
+      });
+    }
+
+    if (item.type === 'function_call_output') {
+      // Function call output items represent tool results
+      const fcoItem = item as { type: 'function_call_output'; call_id: string; output: string };
+
+      messages.push({
+        role: 'tool',
+        content: fcoItem.output,
+        tool_call_id: fcoItem.call_id,
+      });
+    }
+
+    // Reasoning items are typically not passed back as input
+    // They're model-generated and may be encrypted
+  }
+
+  return messages;
+}
+
+/**
+ * Merge previous conversation messages with new input
+ */
+export function mergeMessagesWithInput(
+  previousMessages: InternalMessage[],
+  newInput: InternalMessage[],
+): InternalMessage[] {
+  return [...previousMessages, ...newInput];
+}
+
+/* =============================================================================
+ * ERROR RESPONSE
+ * ============================================================================= */
+
+/**
+ * Send an error response in Open Responses format
+ */
+export function sendResponsesErrorResponse(
+  res: ServerResponse,
+  statusCode: number,
+  message: string,
+  type: string = 'invalid_request',
+  code?: string,
+): void {
+  res.status(statusCode).json({
+    error: {
+      type,
+      message,
+      code: code ?? null,
+      param: null,
+    },
+  });
+}
+
+/* =============================================================================
+ * RESPONSE CONTEXT
+ * ============================================================================= */
+
+/**
+ * Generate a unique response ID
+ */
+export function generateResponseId(): string {
+  return `resp_${Date.now().toString(36)}${Math.random().toString(36).substring(2, 8)}`;
+}
+
+/**
+ * Create a response context from request
+ */
+export function createResponseContext(
+  request: ResponseRequest,
+  responseId?: string,
+): ResponseContext {
+  return {
+    responseId: responseId ?? generateResponseId(),
+    model: request.model,
+    createdAt: Math.floor(Date.now() / 1000),
+    previousResponseId: request.previous_response_id,
+    instructions: request.instructions,
+  };
+}
+
+/* =============================================================================
+ * STREAMING SETUP
+ * ============================================================================= */
+
+/**
+ * Set up streaming response headers
+ */
+export function setupStreamingResponse(res: ServerResponse): void {
+  res.setHeader('Content-Type', 'text/event-stream');
+  res.setHeader('Cache-Control', 'no-cache');
+  res.setHeader('Connection', 'keep-alive');
+  res.setHeader('X-Accel-Buffering', 'no');
+  res.flushHeaders();
+}
+
+/* =============================================================================
+ * STREAM HANDLER FACTORY
+ * ============================================================================= */
+
+/**
+ * State for tracking streaming progress
+ */
+interface StreamState {
+  messageStarted: boolean;
+  messageContentStarted: boolean;
+  reasoningStarted: boolean;
+  reasoningContentStarted: boolean;
+  activeToolCalls: Set<string>;
+  completedToolCalls: Set<string>;
+}
+
+/**
+ * Create LibreChat event handlers that emit Open Responses events
+ */
+export function createResponsesEventHandlers(config: StreamHandlerConfig): {
+  handlers: Record<string, { handle: (event: string, data: unknown) => void }>;
+  state: StreamState;
+  finalizeStream: () => void;
+} {
+  const state: StreamState = {
+    messageStarted: false,
+    messageContentStarted: false,
+    reasoningStarted: false,
+    reasoningContentStarted: false,
+    activeToolCalls: new Set(),
+    completedToolCalls: new Set(),
+  };
+
+  /**
+   * Ensure message item is started
+   */
+  const ensureMessageStarted = (): void => {
+    if (!state.messageStarted) {
+      emitMessageItemAdded(config);
+      state.messageStarted = true;
+    }
+  };
+
+  /**
+   * Ensure message content part is started
+   */
+  const ensureMessageContentStarted = (): void => {
+    ensureMessageStarted();
+    if (!state.messageContentStarted) {
+      emitTextContentPartAdded(config);
+      state.messageContentStarted = true;
+    }
+  };
+
+  /**
+   * Ensure reasoning item is started
+   */
+  const ensureReasoningStarted = (): void => {
+    if (!state.reasoningStarted) {
+      emitReasoningItemAdded(config);
+      state.reasoningStarted = true;
+    }
+  };
+
+  /**
+   * Ensure reasoning content part is started
+   */
+  const ensureReasoningContentStarted = (): void => {
+    ensureReasoningStarted();
+    if (!state.reasoningContentStarted) {
+      emitReasoningContentPartAdded(config);
+      state.reasoningContentStarted = true;
+    }
+  };
+
+  /**
+   * Close any open content streams
+   */
+  const closeOpenStreams = (): void => {
+    // Close message content if open
+    if (state.messageContentStarted) {
+      emitOutputTextDone(config);
+      emitTextContentPartDone(config);
+      state.messageContentStarted = false;
+    }
+
+    // Close message item if open
+    if (state.messageStarted) {
+      emitMessageItemDone(config);
+      state.messageStarted = false;
+    }
+
+    // Close reasoning content if open
+    if (state.reasoningContentStarted) {
+      emitReasoningDone(config);
+      emitReasoningContentPartDone(config);
+      state.reasoningContentStarted = false;
+    }
+
+    // Close reasoning item if open
+    if (state.reasoningStarted) {
+      emitReasoningItemDone(config);
+      state.reasoningStarted = false;
+    }
+  };
+
+  const handlers = {
+    /**
+     * Handle text message deltas
+     */
+    on_message_delta: {
+      handle: (_event: string, data: unknown): void => {
+        const deltaData = data as { delta?: { content?: Array<{ type: string; text?: string }> } };
+        const content = deltaData?.delta?.content;
+
+        if (Array.isArray(content)) {
+          for (const part of content) {
+            if (part.type === 'text' && part.text) {
+              ensureMessageContentStarted();
+              emitOutputTextDelta(config, part.text);
+            }
+          }
+        }
+      },
+    },
+
+    /**
+     * Handle reasoning deltas
+     */
+    on_reasoning_delta: {
+      handle: (_event: string, data: unknown): void => {
+        const deltaData = data as {
+          delta?: { content?: Array<{ type: string; text?: string; think?: string }> };
+        };
+        const content = deltaData?.delta?.content;
+
+        if (Array.isArray(content)) {
+          for (const part of content) {
+            const text = part.think || part.text;
+            if (text) {
+              ensureReasoningContentStarted();
+              emitReasoningDelta(config, text);
+            }
+          }
+        }
+      },
+    },
+
+    /**
+     * Handle run step (tool call initiation)
+     */
+    on_run_step: {
+      handle: (_event: string, data: unknown): void => {
+        const stepData = data as {
+          stepDetails?: { type: string; tool_calls?: Array<{ id?: string; name?: string }> };
+        };
+        const stepDetails = stepData?.stepDetails;
+
+        if (stepDetails?.type === 'tool_calls' && stepDetails.tool_calls) {
+          // Close any open message/reasoning before tool calls
+          closeOpenStreams();
+
+          for (const tc of stepDetails.tool_calls) {
+            const callId = tc.id ?? '';
+            const name = tc.name ?? '';
+
+            if (callId && !state.activeToolCalls.has(callId)) {
+              state.activeToolCalls.add(callId);
+              emitFunctionCallItemAdded(config, callId, name);
+            }
+          }
+        }
+      },
+    },
+
+    /**
+     * Handle run step delta (tool call argument streaming)
+     */
+    on_run_step_delta: {
+      handle: (_event: string, data: unknown): void => {
+        const deltaData = data as {
+          delta?: { type: string; tool_calls?: Array<{ index?: number; args?: string }> };
+        };
+        const delta = deltaData?.delta;
+
+        if (delta?.type === 'tool_calls' && delta.tool_calls) {
+          for (const tc of delta.tool_calls) {
+            const args = tc.args ?? '';
+            if (!args) {
+              continue;
+            }
+
+            // Find the call_id for this tool call by index
+            const toolCallsArray = Array.from(state.activeToolCalls);
+            const callId = toolCallsArray[tc.index ?? 0];
+
+            if (callId) {
+              emitFunctionCallArgumentsDelta(config, callId, args);
+            }
+          }
+        }
+      },
+    },
+
+    /**
+     * Handle tool end (tool execution complete)
+     */
+    on_tool_end: {
+      handle: (_event: string, data: unknown): void => {
+        const toolData = data as { tool_call_id?: string; output?: string };
+        const callId = toolData?.tool_call_id;
+        const output = toolData?.output ?? '';
+
+        if (callId && state.activeToolCalls.has(callId) && !state.completedToolCalls.has(callId)) {
+          state.completedToolCalls.add(callId);
+
+          // Complete the function call item
+          emitFunctionCallArgumentsDone(config, callId);
+          emitFunctionCallItemDone(config, callId);
+
+          // Emit the function call output (internal tool result)
+          emitFunctionCallOutputItem(config, callId, output);
+        }
+      },
+    },
+
+    /**
+     * Handle chat model end (usage collection)
+     */
+    on_chat_model_end: {
+      handle: (_event: string, data: unknown): void => {
+        const endData = data as {
+          output?: {
+            usage_metadata?: {
+              input_tokens?: number;
+              output_tokens?: number;
+              // OpenAI format
+              input_token_details?: {
+                cache_creation?: number;
+                cache_read?: number;
+              };
+              // Anthropic format
+              cache_creation_input_tokens?: number;
+              cache_read_input_tokens?: number;
+            };
+          };
+        };
+
+        const usage = endData?.output?.usage_metadata;
+        if (usage) {
+          // Extract cached tokens from either OpenAI or Anthropic format
+          const cachedTokens =
+            (usage.input_token_details?.cache_read ?? 0) + (usage.cache_read_input_tokens ?? 0);
+
+          updateTrackerUsage(config.tracker, {
+            promptTokens: usage.input_tokens,
+            completionTokens: usage.output_tokens,
+            cachedTokens,
+          });
+        }
+      },
+    },
+  };
+
+  /**
+   * Finalize the stream - close open items and emit completed
+   */
+  const finalizeStream = (): void => {
+    closeOpenStreams();
+    emitResponseCompleted(config);
+    writeDone(config.res);
+  };
+
+  return { handlers, state, finalizeStream };
+}
+
+/* =============================================================================
+ * NON-STREAMING AGGREGATOR
+ * ============================================================================= */
+
+/**
+ * Aggregator for non-streaming responses
+ */
+export interface ResponseAggregator {
+  textChunks: string[];
+  reasoningChunks: string[];
+  toolCalls: Map<
+    string,
+    {
+      id: string;
+      name: string;
+      arguments: string;
+    }
+  >;
+  toolOutputs: Map<string, string>;
+  usage: {
+    inputTokens: number;
+    outputTokens: number;
+    reasoningTokens: number;
+    cachedTokens: number;
+  };
+  addText: (text: string) => void;
+  addReasoning: (text: string) => void;
+  getText: () => string;
+  getReasoning: () => string;
+}
+
+/**
+ * Create an aggregator for non-streaming responses
+ */
+export function createResponseAggregator(): ResponseAggregator {
+  const aggregator: ResponseAggregator = {
+    textChunks: [],
+    reasoningChunks: [],
+    toolCalls: new Map(),
+    toolOutputs: new Map(),
+    usage: {
+      inputTokens: 0,
+      outputTokens: 0,
+      reasoningTokens: 0,
+      cachedTokens: 0,
+    },
+    addText: (text: string) => {
+      aggregator.textChunks.push(text);
+    },
+    addReasoning: (text: string) => {
+      aggregator.reasoningChunks.push(text);
+    },
+    getText: () => aggregator.textChunks.join(''),
+    getReasoning: () => aggregator.reasoningChunks.join(''),
+  };
+  return aggregator;
+}
+
+/**
+ * Build a non-streaming response from aggregator
+ * Includes all required fields per Open Responses spec
+ */
+export function buildAggregatedResponse(
+  context: ResponseContext,
+  aggregator: ResponseAggregator,
+): Response {
+  const output: Response['output'] = [];
+
+  // Add reasoning item if present
+  const reasoningText = aggregator.getReasoning();
+  if (reasoningText) {
+    output.push({
+      type: 'reasoning',
+      id: `reason_${Date.now().toString(36)}`,
+      status: 'completed',
+      content: [{ type: 'reasoning_text', text: reasoningText }],
+      summary: [],
+    });
+  }
+
+  // Add function calls and outputs
+  for (const [callId, tc] of aggregator.toolCalls) {
+    output.push({
+      type: 'function_call',
+      id: `fc_${Date.now().toString(36)}${Math.random().toString(36).substring(2, 6)}`,
+      call_id: callId,
+      name: tc.name,
+      arguments: tc.arguments,
+      status: 'completed',
+    });
+
+    const toolOutput = aggregator.toolOutputs.get(callId);
+    if (toolOutput) {
+      output.push({
+        type: 'function_call_output',
+        id: `fco_${Date.now().toString(36)}${Math.random().toString(36).substring(2, 6)}`,
+        call_id: callId,
+        output: toolOutput,
+        status: 'completed',
+      });
+    }
+  }
+
+  // Add message item if there's text (or always add one if no other output)
+  const text = aggregator.getText();
+  if (text || output.length === 0) {
+    output.push({
+      type: 'message',
+      id: `msg_${Date.now().toString(36)}`,
+      role: 'assistant',
+      status: 'completed',
+      content: text ? [{ type: 'output_text', text, annotations: [], logprobs: [] }] : [],
+    });
+  }
+
+  return {
+    // Required fields per Open Responses spec
+    id: context.responseId,
+    object: 'response',
+    created_at: context.createdAt,
+    completed_at: Math.floor(Date.now() / 1000),
+    status: 'completed',
+    incomplete_details: null,
+    model: context.model,
+    previous_response_id: context.previousResponseId ?? null,
+    instructions: context.instructions ?? null,
+    output,
+    error: null,
+    tools: [],
+    tool_choice: 'auto',
+    truncation: 'disabled',
+    parallel_tool_calls: true,
+    text: { format: { type: 'text' } },
+    temperature: 1,
+    top_p: 1,
+    presence_penalty: 0,
+    frequency_penalty: 0,
+    top_logprobs: 0,
+    reasoning: null,
+    user: null,
+    usage: {
+      input_tokens: aggregator.usage.inputTokens,
+      output_tokens: aggregator.usage.outputTokens,
+      total_tokens: aggregator.usage.inputTokens + aggregator.usage.outputTokens,
+      input_tokens_details: { cached_tokens: aggregator.usage.cachedTokens },
+      output_tokens_details: { reasoning_tokens: aggregator.usage.reasoningTokens },
+    },
+    max_output_tokens: null,
+    max_tool_calls: null,
+    store: false,
+    background: false,
+    service_tier: 'default',
+    metadata: {},
+    safety_identifier: null,
+    prompt_cache_key: null,
+  };
+}
+
+/**
+ * Create event handlers for non-streaming aggregation
+ */
+export function createAggregatorEventHandlers(aggregator: ResponseAggregator): Record<
+  string,
+  {
+    handle: (event: string, data: unknown) => void;
+  }
+> {
+  const activeToolCalls = new Set<string>();
+
+  return {
+    on_message_delta: {
+      handle: (_event: string, data: unknown): void => {
+        const deltaData = data as { delta?: { content?: Array<{ type: string; text?: string }> } };
+        const content = deltaData?.delta?.content;
+
+        if (Array.isArray(content)) {
+          for (const part of content) {
+            if (part.type === 'text' && part.text) {
+              aggregator.addText(part.text);
+            }
+          }
+        }
+      },
+    },
+
+    on_reasoning_delta: {
+      handle: (_event: string, data: unknown): void => {
+        const deltaData = data as {
+          delta?: { content?: Array<{ type: string; text?: string; think?: string }> };
+        };
+        const content = deltaData?.delta?.content;
+
+        if (Array.isArray(content)) {
+          for (const part of content) {
+            const text = part.think || part.text;
+            if (text) {
+              aggregator.addReasoning(text);
+            }
+          }
+        }
+      },
+    },
+
+    on_run_step: {
+      handle: (_event: string, data: unknown): void => {
+        const stepData = data as {
+          stepDetails?: { type: string; tool_calls?: Array<{ id?: string; name?: string }> };
+        };
+        const stepDetails = stepData?.stepDetails;
+
+        if (stepDetails?.type === 'tool_calls' && stepDetails.tool_calls) {
+          for (const tc of stepDetails.tool_calls) {
+            const callId = tc.id ?? '';
+            const name = tc.name ?? '';
+
+            if (callId && !activeToolCalls.has(callId)) {
+              activeToolCalls.add(callId);
+              aggregator.toolCalls.set(callId, { id: callId, name, arguments: '' });
+            }
+          }
+        }
+      },
+    },
+
+    on_run_step_delta: {
+      handle: (_event: string, data: unknown): void => {
+        const deltaData = data as {
+          delta?: { type: string; tool_calls?: Array<{ index?: number; args?: string }> };
+        };
+        const delta = deltaData?.delta;
+
+        if (delta?.type === 'tool_calls' && delta.tool_calls) {
+          for (const tc of delta.tool_calls) {
+            const args = tc.args ?? '';
+            if (!args) {
+              continue;
+            }
+
+            const toolCallsArray = Array.from(activeToolCalls);
+            const callId = toolCallsArray[tc.index ?? 0];
+
+            if (callId) {
+              const existing = aggregator.toolCalls.get(callId);
+              if (existing) {
+                existing.arguments += args;
+              }
+            }
+          }
+        }
+      },
+    },
+
+    on_tool_end: {
+      handle: (_event: string, data: unknown): void => {
+        const toolData = data as { tool_call_id?: string; output?: string };
+        const callId = toolData?.tool_call_id;
+        const output = toolData?.output ?? '';
+
+        if (callId) {
+          aggregator.toolOutputs.set(callId, output);
+        }
+      },
+    },
+
+    on_chat_model_end: {
+      handle: (_event: string, data: unknown): void => {
+        const endData = data as {
+          output?: {
+            usage_metadata?: {
+              input_tokens?: number;
+              output_tokens?: number;
+              // OpenAI format
+              input_token_details?: {
+                cache_creation?: number;
+                cache_read?: number;
+              };
+              // Anthropic format
+              cache_creation_input_tokens?: number;
+              cache_read_input_tokens?: number;
+            };
+          };
+        };
+
+        const usage = endData?.output?.usage_metadata;
+        if (usage) {
+          aggregator.usage.inputTokens = usage.input_tokens ?? 0;
+          aggregator.usage.outputTokens = usage.output_tokens ?? 0;
+
+          // Extract cached tokens from either OpenAI or Anthropic format
+          aggregator.usage.cachedTokens =
+            (usage.input_token_details?.cache_read ?? 0) + (usage.cache_read_input_tokens ?? 0);
+        }
+      },
+    },
+  };
+}
diff --git a/packages/api/src/agents/responses/types.ts b/packages/api/src/agents/responses/types.ts
new file mode 100644
index 0000000000..65e5887ab8
--- /dev/null
+++ b/packages/api/src/agents/responses/types.ts
@@ -0,0 +1,779 @@
+/**
+ * Open Responses API Types
+ *
+ * Types following the Open Responses specification for building multi-provider,
+ * interoperable LLM interfaces. Items are the fundamental unit of context,
+ * and streaming uses semantic events rather than simple deltas.
+ *
+ * @see https://openresponses.org/specification
+ */
+
+/* =============================================================================
+ * ENUMS
+ * ============================================================================= */
+
+/** Item status lifecycle */
+export type ItemStatus = 'in_progress' | 'incomplete' | 'completed';
+
+/** Response status lifecycle */
+export type ResponseStatus = 'in_progress' | 'completed' | 'failed' | 'incomplete';
+
+/** Message roles */
+export type MessageRole = 'user' | 'assistant' | 'system' | 'developer';
+
+/** Tool choice options */
+export type ToolChoiceValue = 'none' | 'auto' | 'required';
+
+/** Truncation options */
+export type TruncationValue = 'auto' | 'disabled';
+
+/** Service tier options */
+export type ServiceTier = 'auto' | 'default' | 'flex' | 'priority';
+
+/** Reasoning effort levels */
+export type ReasoningEffort = 'none' | 'low' | 'medium' | 'high' | 'xhigh';
+
+/** Reasoning summary options */
+export type ReasoningSummary = 'concise' | 'detailed' | 'auto';
+
+/* =============================================================================
+ * INPUT CONTENT TYPES
+ * ============================================================================= */
+
+/** Text input content */
+export interface InputTextContent {
+  type: 'input_text';
+  text: string;
+}
+
+/** Image input content */
+export interface InputImageContent {
+  type: 'input_image';
+  image_url?: string;
+  file_id?: string;
+  detail?: 'auto' | 'low' | 'high';
+}
+
+/** File input content */
+export interface InputFileContent {
+  type: 'input_file';
+  file_id?: string;
+  file_data?: string;
+  filename?: string;
+}
+
+/** Union of all input content types */
+export type InputContent = InputTextContent | InputImageContent | InputFileContent;
+
+/* =============================================================================
+ * OUTPUT CONTENT TYPES
+ * ============================================================================= */
+
+/** Log probability for a token */
+export interface LogProb {
+  token: string;
+  logprob: number;
+  bytes?: number[];
+  top_logprobs?: TopLogProb[];
+}
+
+/** Top log probability entry */
+export interface TopLogProb {
+  token: string;
+  logprob: number;
+  bytes?: number[];
+}
+
+/** Text output content */
+export interface OutputTextContent {
+  type: 'output_text';
+  text: string;
+  annotations: Annotation[];
+  logprobs: LogProb[];
+}
+
+/** Refusal content */
+export interface RefusalContent {
+  type: 'refusal';
+  refusal: string;
+}
+
+/** Union of model output content types */
+export type ModelContent = OutputTextContent | RefusalContent;
+
+/* =============================================================================
+ * ANNOTATIONS
+ * ============================================================================= */
+
+/** URL citation annotation */
+export interface UrlCitationAnnotation {
+  type: 'url_citation';
+  url: string;
+  title?: string;
+  start_index: number;
+  end_index: number;
+}
+
+/** File citation annotation */
+export interface FileCitationAnnotation {
+  type: 'file_citation';
+  file_id: string;
+  start_index: number;
+  end_index: number;
+}
+
+/** Union of annotation types */
+export type Annotation = UrlCitationAnnotation | FileCitationAnnotation;
+
+/* =============================================================================
+ * REASONING CONTENT
+ * ============================================================================= */
+
+/** Reasoning text content */
+export interface ReasoningTextContent {
+  type: 'reasoning_text';
+  text: string;
+}
+
+/** Summary text content */
+export interface SummaryTextContent {
+  type: 'summary_text';
+  text: string;
+}
+
+/** Reasoning content union */
+export type ReasoningContent = ReasoningTextContent;
+
+/* =============================================================================
+ * INPUT ITEMS (for request)
+ * ============================================================================= */
+
+/** System message input item */
+export interface SystemMessageItemParam {
+  type: 'message';
+  role: 'system';
+  content: string | InputContent[];
+}
+
+/** Developer message input item */
+export interface DeveloperMessageItemParam {
+  type: 'message';
+  role: 'developer';
+  content: string | InputContent[];
+}
+
+/** User message input item */
+export interface UserMessageItemParam {
+  type: 'message';
+  role: 'user';
+  content: string | InputContent[];
+}
+
+/** Assistant message input item */
+export interface AssistantMessageItemParam {
+  type: 'message';
+  role: 'assistant';
+  content: string | ModelContent[];
+}
+
+/** Function call input item (for providing context) */
+export interface FunctionCallItemParam {
+  type: 'function_call';
+  id: string;
+  call_id: string;
+  name: string;
+  arguments: string;
+  status?: ItemStatus;
+}
+
+/** Function call output input item (for providing tool results) */
+export interface FunctionCallOutputItemParam {
+  type: 'function_call_output';
+  call_id: string;
+  output: string;
+  status?: ItemStatus;
+}
+
+/** Reasoning input item */
+export interface ReasoningItemParam {
+  type: 'reasoning';
+  id?: string;
+  content?: ReasoningContent[];
+  encrypted_content?: string;
+  summary?: SummaryTextContent[];
+  status?: ItemStatus;
+}
+
+/** Item reference (for referencing existing items) */
+export interface ItemReferenceParam {
+  type: 'item_reference';
+  id: string;
+}
+
+/** Union of all input item types */
+export type InputItem =
+  | SystemMessageItemParam
+  | DeveloperMessageItemParam
+  | UserMessageItemParam
+  | AssistantMessageItemParam
+  | FunctionCallItemParam
+  | FunctionCallOutputItemParam
+  | ReasoningItemParam
+  | ItemReferenceParam;
+
+/* =============================================================================
+ * OUTPUT ITEMS (in response)
+ * ============================================================================= */
+
+/** Message output item */
+export interface MessageItem {
+  type: 'message';
+  id: string;
+  role: 'assistant';
+  status: ItemStatus;
+  content: ModelContent[];
+}
+
+/** Function call output item */
+export interface FunctionCallItem {
+  type: 'function_call';
+  id: string;
+  call_id: string;
+  name: string;
+  arguments: string;
+  status: ItemStatus;
+}
+
+/** Function call output result item (internal tool execution result) */
+export interface FunctionCallOutputItem {
+  type: 'function_call_output';
+  id: string;
+  call_id: string;
+  output: string;
+  status: ItemStatus;
+}
+
+/** Reasoning output item */
+export interface ReasoningItem {
+  type: 'reasoning';
+  id: string;
+  status?: ItemStatus;
+  content?: ReasoningContent[];
+  encrypted_content?: string;
+  /** Required per Open Responses spec - summary content parts */
+  summary: SummaryTextContent[];
+}
+
+/** Union of all output item types */
+export type OutputItem = MessageItem | FunctionCallItem | FunctionCallOutputItem | ReasoningItem;
+
+/* =============================================================================
+ * TOOLS
+ * ============================================================================= */
+
+/** Function tool definition */
+export interface FunctionTool {
+  type: 'function';
+  name: string;
+  description?: string;
+  parameters?: Record<string, unknown>;
+  strict?: boolean;
+}
+
+/** Hosted tool (provider-specific) */
+export interface HostedTool {
+  type: string; // e.g., 'librechat:web_search'
+  [key: string]: unknown;
+}
+
+/** Union of tool types */
+export type Tool = FunctionTool | HostedTool;
+
+/** Specific function tool choice */
+export interface FunctionToolChoice {
+  type: 'function';
+  name: string;
+}
+
+/** Tool choice parameter */
+export type ToolChoice = ToolChoiceValue | FunctionToolChoice;
+
+/* =============================================================================
+ * REQUEST
+ * ============================================================================= */
+
+/** Reasoning configuration */
+export interface ReasoningConfig {
+  effort?: ReasoningEffort;
+  summary?: ReasoningSummary;
+}
+
+/** Text output configuration */
+export interface TextConfig {
+  format?: {
+    type: 'text' | 'json_object' | 'json_schema';
+    json_schema?: Record<string, unknown>;
+  };
+}
+
+/** Stream options */
+export interface StreamOptions {
+  include_usage?: boolean;
+}
+
+/** Metadata (key-value pairs) */
+export type Metadata = Record<string, string>;
+
+/** Open Responses API Request */
+export interface ResponseRequest {
+  /** Model/agent ID to use */
+  model: string;
+
+  /** Input context - string or array of items */
+  input: string | InputItem[];
+
+  /** Previous response ID for conversation continuation */
+  previous_response_id?: string;
+
+  /** Tools available to the model */
+  tools?: Tool[];
+
+  /** Tool choice configuration */
+  tool_choice?: ToolChoice;
+
+  /** Whether to stream the response */
+  stream?: boolean;
+
+  /** Stream options */
+  stream_options?: StreamOptions;
+
+  /** Additional instructions */
+  instructions?: string;
+
+  /** Maximum output tokens */
+  max_output_tokens?: number;
+
+  /** Maximum tool calls */
+  max_tool_calls?: number;
+
+  /** Sampling temperature */
+  temperature?: number;
+
+  /** Top-p sampling */
+  top_p?: number;
+
+  /** Presence penalty */
+  presence_penalty?: number;
+
+  /** Frequency penalty */
+  frequency_penalty?: number;
+
+  /** Reasoning configuration */
+  reasoning?: ReasoningConfig;
+
+  /** Text output configuration */
+  text?: TextConfig;
+
+  /** Truncation behavior */
+  truncation?: TruncationValue;
+
+  /** Service tier */
+  service_tier?: ServiceTier;
+
+  /** Whether to store the response */
+  store?: boolean;
+
+  /** Metadata */
+  metadata?: Metadata;
+
+  /** Whether model can call multiple tools in parallel */
+  parallel_tool_calls?: boolean;
+
+  /** User identifier for safety */
+  user?: string;
+}
+
+/* =============================================================================
+ * RESPONSE
+ * ============================================================================= */
+
+/** Token usage details */
+export interface InputTokensDetails {
+  cached_tokens: number;
+}
+
+/** Output tokens details */
+export interface OutputTokensDetails {
+  reasoning_tokens: number;
+}
+
+/** Token usage statistics */
+export interface Usage {
+  input_tokens: number;
+  output_tokens: number;
+  total_tokens: number;
+  input_tokens_details: InputTokensDetails;
+  output_tokens_details: OutputTokensDetails;
+}
+
+/** Incomplete details */
+export interface IncompleteDetails {
+  reason: 'max_output_tokens' | 'max_tool_calls' | 'content_filter' | 'other';
+}
+
+/** Error object */
+export interface ResponseError {
+  type: 'server_error' | 'invalid_request' | 'not_found' | 'model_error' | 'too_many_requests';
+  code?: string;
+  message: string;
+  param?: string;
+}
+
+/** Text field configuration */
+export interface TextField {
+  format?: {
+    type: 'text' | 'json_object' | 'json_schema';
+    json_schema?: Record<string, unknown>;
+  };
+}
+
+/** Open Responses API Response - All required fields per spec */
+export interface Response {
+  /** Response ID */
+  id: string;
+
+  /** Object type - always "response" */
+  object: 'response';
+
+  /** Creation timestamp (Unix seconds) */
+  created_at: number;
+
+  /** Completion timestamp (Unix seconds) - null if not completed */
+  completed_at: number | null;
+
+  /** Response status */
+  status: ResponseStatus;
+
+  /** Incomplete details - null if not incomplete */
+  incomplete_details: IncompleteDetails | null;
+
+  /** Model that generated the response */
+  model: string;
+
+  /** Previous response ID - null if not a continuation */
+  previous_response_id: string | null;
+
+  /** Instructions used - null if none */
+  instructions: string | null;
+
+  /** Output items */
+  output: OutputItem[];
+
+  /** Error - null if no error */
+  error: ResponseError | null;
+
+  /** Tools available */
+  tools: Tool[];
+
+  /** Tool choice setting */
+  tool_choice: ToolChoice;
+
+  /** Truncation setting used */
+  truncation: TruncationValue;
+
+  /** Whether parallel tool calls were allowed */
+  parallel_tool_calls: boolean;
+
+  /** Text configuration used */
+  text: TextField;
+
+  /** Temperature used */
+  temperature: number;
+
+  /** Top-p used */
+  top_p: number;
+
+  /** Presence penalty used */
+  presence_penalty: number;
+
+  /** Frequency penalty used */
+  frequency_penalty: number;
+
+  /** Top logprobs - number of most likely tokens to return */
+  top_logprobs: number;
+
+  /** Reasoning configuration - null if none */
+  reasoning: ReasoningConfig | null;
+
+  /** User identifier - null if none */
+  user: string | null;
+
+  /** Token usage - null if not available */
+  usage: Usage | null;
+
+  /** Max output tokens - null if not set */
+  max_output_tokens: number | null;
+
+  /** Max tool calls - null if not set */
+  max_tool_calls: number | null;
+
+  /** Whether response was stored */
+  store: boolean;
+
+  /** Whether request was run in background */
+  background: boolean;
+
+  /** Service tier used */
+  service_tier: string;
+
+  /** Metadata */
+  metadata: Metadata;
+
+  /** Safety identifier - null if none */
+  safety_identifier: string | null;
+
+  /** Prompt cache key - null if none */
+  prompt_cache_key: string | null;
+}
+
+/* =============================================================================
+ * STREAMING EVENTS
+ * ============================================================================= */
+
+/** Base event structure */
+export interface BaseEvent {
+  type: string;
+  sequence_number: number;
+}
+
+/** Response created event (first event in stream) */
+export interface ResponseCreatedEvent extends BaseEvent {
+  type: 'response.created';
+  response: Response;
+}
+
+/** Response in_progress event */
+export interface ResponseInProgressEvent extends BaseEvent {
+  type: 'response.in_progress';
+  response: Response;
+}
+
+/** Response completed event */
+export interface ResponseCompletedEvent extends BaseEvent {
+  type: 'response.completed';
+  response: Response;
+}
+
+/** Response failed event */
+export interface ResponseFailedEvent extends BaseEvent {
+  type: 'response.failed';
+  response: Response;
+}
+
+/** Response incomplete event */
+export interface ResponseIncompleteEvent extends BaseEvent {
+  type: 'response.incomplete';
+  response: Response;
+}
+
+/** Output item added event */
+export interface OutputItemAddedEvent extends BaseEvent {
+  type: 'response.output_item.added';
+  output_index: number;
+  item: OutputItem;
+}
+
+/** Output item done event */
+export interface OutputItemDoneEvent extends BaseEvent {
+  type: 'response.output_item.done';
+  output_index: number;
+  item: OutputItem;
+}
+
+/** Content part added event */
+export interface ContentPartAddedEvent extends BaseEvent {
+  type: 'response.content_part.added';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  part: ModelContent | ReasoningContent;
+}
+
+/** Content part done event */
+export interface ContentPartDoneEvent extends BaseEvent {
+  type: 'response.content_part.done';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  part: ModelContent | ReasoningContent;
+}
+
+/** Output text delta event */
+export interface OutputTextDeltaEvent extends BaseEvent {
+  type: 'response.output_text.delta';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  delta: string;
+  logprobs: LogProb[];
+}
+
+/** Output text done event */
+export interface OutputTextDoneEvent extends BaseEvent {
+  type: 'response.output_text.done';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  text: string;
+  logprobs: LogProb[];
+}
+
+/** Refusal delta event */
+export interface RefusalDeltaEvent extends BaseEvent {
+  type: 'response.refusal.delta';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  delta: string;
+}
+
+/** Refusal done event */
+export interface RefusalDoneEvent extends BaseEvent {
+  type: 'response.refusal.done';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  refusal: string;
+}
+
+/** Function call arguments delta event */
+export interface FunctionCallArgumentsDeltaEvent extends BaseEvent {
+  type: 'response.function_call_arguments.delta';
+  item_id: string;
+  output_index: number;
+  call_id: string;
+  delta: string;
+}
+
+/** Function call arguments done event */
+export interface FunctionCallArgumentsDoneEvent extends BaseEvent {
+  type: 'response.function_call_arguments.done';
+  item_id: string;
+  output_index: number;
+  call_id: string;
+  arguments: string;
+}
+
+/** Reasoning delta event */
+export interface ReasoningDeltaEvent extends BaseEvent {
+  type: 'response.reasoning.delta';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  delta: string;
+}
+
+/** Reasoning done event */
+export interface ReasoningDoneEvent extends BaseEvent {
+  type: 'response.reasoning.done';
+  item_id: string;
+  output_index: number;
+  content_index: number;
+  text: string;
+}
+
+/** Error event */
+export interface ErrorEvent extends BaseEvent {
+  type: 'error';
+  error: ResponseError;
+}
+
+/* =============================================================================
+ * LIBRECHAT EXTENSION TYPES
+ * Per Open Responses spec, custom types MUST be prefixed with implementor slug
+ * @see https://openresponses.org/specification#extending-streaming-events
+ * ============================================================================= */
+
+/** Attachment content types for LibreChat extensions */
+export interface LibreChatAttachmentContent {
+  /** File ID in LibreChat storage */
+  file_id?: string;
+  /** Original filename */
+  filename?: string;
+  /** MIME type */
+  type?: string;
+  /** URL to access the file */
+  url?: string;
+  /** Base64-encoded image data (for inline images) */
+  image_url?: string;
+  /** Width for images */
+  width?: number;
+  /** Height for images */
+  height?: number;
+  /** Associated tool call ID */
+  tool_call_id?: string;
+  /** Additional metadata */
+  [key: string]: unknown;
+}
+
+/**
+ * LibreChat attachment event - custom streaming event for file/image attachments
+ * Follows Open Responses extension pattern with librechat: prefix
+ */
+export interface LibreChatAttachmentEvent extends BaseEvent {
+  type: 'librechat:attachment';
+  /** The attachment data */
+  attachment: LibreChatAttachmentContent;
+  /** Associated message ID */
+  message_id?: string;
+  /** Associated conversation ID */
+  conversation_id?: string;
+}
+
+/** Union of all streaming events (including LibreChat extensions) */
+export type ResponseEvent =
+  | ResponseCreatedEvent
+  | ResponseInProgressEvent
+  | ResponseCompletedEvent
+  | ResponseFailedEvent
+  | ResponseIncompleteEvent
+  | OutputItemAddedEvent
+  | OutputItemDoneEvent
+  | ContentPartAddedEvent
+  | ContentPartDoneEvent
+  | OutputTextDeltaEvent
+  | OutputTextDoneEvent
+  | RefusalDeltaEvent
+  | RefusalDoneEvent
+  | FunctionCallArgumentsDeltaEvent
+  | FunctionCallArgumentsDoneEvent
+  | ReasoningDeltaEvent
+  | ReasoningDoneEvent
+  | ErrorEvent
+  // LibreChat extensions (prefixed per Open Responses spec)
+  | LibreChatAttachmentEvent;
+
+/* =============================================================================
+ * INTERNAL TYPES
+ * ============================================================================= */
+
+/** Context for building responses */
+export interface ResponseContext {
+  /** Response ID */
+  responseId: string;
+  /** Model/agent ID */
+  model: string;
+  /** Creation timestamp */
+  createdAt: number;
+  /** Previous response ID */
+  previousResponseId?: string;
+  /** Instructions */
+  instructions?: string;
+}
+
+/** Validation result for requests */
+export interface RequestValidationResult {
+  valid: boolean;
+  request?: ResponseRequest;
+  error?: string;
+}
diff --git a/packages/api/src/agents/run.spec.ts b/packages/api/src/agents/run.spec.ts
new file mode 100644
index 0000000000..a7e58a5b4f
--- /dev/null
+++ b/packages/api/src/agents/run.spec.ts
@@ -0,0 +1,133 @@
+import { ToolMessage, AIMessage, HumanMessage } from '@langchain/core/messages';
+import { extractDiscoveredToolsFromHistory } from './run';
+
+describe('extractDiscoveredToolsFromHistory', () => {
+  it('extracts tool names from tool_search JSON output', () => {
+    const toolSearchOutput = JSON.stringify({
+      found: 3,
+      tools: [
+        { name: 'tool_a', score: 1.0 },
+        { name: 'tool_b', score: 0.8 },
+        { name: 'tool_c', score: 0.5 },
+      ],
+    });
+
+    const messages = [
+      new HumanMessage('Find tools'),
+      new AIMessage({ content: '', tool_calls: [{ id: 'call_1', name: 'tool_search', args: {} }] }),
+      new ToolMessage({ content: toolSearchOutput, tool_call_id: 'call_1', name: 'tool_search' }),
+    ];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    expect(discovered.size).toBe(3);
+    expect(discovered.has('tool_a')).toBe(true);
+    expect(discovered.has('tool_b')).toBe(true);
+    expect(discovered.has('tool_c')).toBe(true);
+  });
+
+  it('extracts tool names from legacy tool_search format', () => {
+    const legacyOutput = `Found 2 tools:
+- tool_x (score: 0.95)
+- tool_y (score: 0.80)`;
+
+    const messages = [
+      new ToolMessage({ content: legacyOutput, tool_call_id: 'call_1', name: 'tool_search' }),
+    ];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    expect(discovered.size).toBe(2);
+    expect(discovered.has('tool_x')).toBe(true);
+    expect(discovered.has('tool_y')).toBe(true);
+  });
+
+  it('returns empty set when no tool_search messages exist', () => {
+    const messages = [new HumanMessage('Hello'), new AIMessage('Hi there!')];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    expect(discovered.size).toBe(0);
+  });
+
+  it('ignores non-tool_search ToolMessages', () => {
+    const messages = [
+      new ToolMessage({
+        content: '[{"sha": "abc123"}]',
+        tool_call_id: 'call_1',
+        name: 'list_commits_mcp_github',
+      }),
+    ];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    expect(discovered.size).toBe(0);
+  });
+
+  it('handles multiple tool_search calls in history', () => {
+    const firstOutput = JSON.stringify({
+      tools: [{ name: 'tool_1' }, { name: 'tool_2' }],
+    });
+    const secondOutput = JSON.stringify({
+      tools: [{ name: 'tool_2' }, { name: 'tool_3' }],
+    });
+
+    const messages = [
+      new ToolMessage({ content: firstOutput, tool_call_id: 'call_1', name: 'tool_search' }),
+      new AIMessage('Using discovered tools'),
+      new ToolMessage({ content: secondOutput, tool_call_id: 'call_2', name: 'tool_search' }),
+    ];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    expect(discovered.size).toBe(3);
+    expect(discovered.has('tool_1')).toBe(true);
+    expect(discovered.has('tool_2')).toBe(true);
+    expect(discovered.has('tool_3')).toBe(true);
+  });
+
+  it('handles malformed JSON in tool_search output', () => {
+    const messages = [
+      new ToolMessage({
+        content: 'This is not valid JSON',
+        tool_call_id: 'call_1',
+        name: 'tool_search',
+      }),
+    ];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    // Should not throw, just return empty set
+    expect(discovered.size).toBe(0);
+  });
+
+  it('handles tool_search output with empty tools array', () => {
+    const output = JSON.stringify({
+      found: 0,
+      tools: [],
+    });
+
+    const messages = [
+      new ToolMessage({ content: output, tool_call_id: 'call_1', name: 'tool_search' }),
+    ];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    expect(discovered.size).toBe(0);
+  });
+
+  it('handles non-string content in ToolMessage', () => {
+    const messages = [
+      new ToolMessage({
+        content: [{ type: 'text', text: 'array content' }],
+        tool_call_id: 'call_1',
+        name: 'tool_search',
+      }),
+    ];
+
+    const discovered = extractDiscoveredToolsFromHistory(messages);
+
+    // Should handle gracefully
+    expect(discovered.size).toBe(0);
+  });
+});
diff --git a/packages/api/src/agents/run.ts b/packages/api/src/agents/run.ts
index 6b18c73799..189ef59469 100644
--- a/packages/api/src/agents/run.ts
+++ b/packages/api/src/agents/run.ts
@@ -1,22 +1,138 @@
-import { Run, Providers } from '@librechat/agents';
+import { Run, Providers, Constants } from '@librechat/agents';
 import { providerEndpointMap, KnownEndpoints } from 'librechat-data-provider';
+import type { BaseMessage } from '@langchain/core/messages';
 import type {
   MultiAgentGraphConfig,
   OpenAIClientOptions,
   StandardGraphConfig,
+  LCToolRegistry,
   AgentInputs,
   GenericTool,
   RunConfig,
   IState,
+  LCTool,
 } from '@librechat/agents';
 import type { IUser } from '@librechat/data-schemas';
 import type { Agent } from 'librechat-data-provider';
 import type * as t from '~/types';
 import { resolveHeaders, createSafeUser } from '~/utils/env';
 
+/** Expected shape of JSON tool search results */
+interface ToolSearchJsonResult {
+  found?: number;
+  tools?: Array<{ name: string }>;
+}
+
+/**
+ * Parses tool names from JSON-formatted tool_search output.
+ * Format: { "found": N, "tools": [{ "name": "tool_name", ... }], ... }
+ *
+ * @param content - The JSON string content
+ * @param discoveredTools - Set to add discovered tool names to
+ * @returns true if parsing succeeded, false otherwise
+ */
+function parseToolSearchJson(content: string, discoveredTools: Set<string>): boolean {
+  try {
+    const parsed = JSON.parse(content) as ToolSearchJsonResult;
+    if (!parsed.tools || !Array.isArray(parsed.tools)) {
+      return false;
+    }
+    for (const tool of parsed.tools) {
+      if (tool.name && typeof tool.name === 'string') {
+        discoveredTools.add(tool.name);
+      }
+    }
+    return parsed.tools.length > 0;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Parses tool names from legacy text-formatted tool_search output.
+ * Format: "- tool_name (score: X.XX)"
+ *
+ * @param content - The text content
+ * @param discoveredTools - Set to add discovered tool names to
+ */
+function parseToolSearchLegacy(content: string, discoveredTools: Set<string>): void {
+  const toolNameRegex = /^- ([^\s(]+)\s*\(score:/gm;
+  let match: RegExpExecArray | null;
+  while ((match = toolNameRegex.exec(content)) !== null) {
+    const toolName = match[1];
+    if (toolName) {
+      discoveredTools.add(toolName);
+    }
+  }
+}
+
+/**
+ * Extracts discovered tool names from message history by parsing tool_search results.
+ * When the LLM calls tool_search, the result contains tool names that were discovered.
+ * These tools should have defer_loading overridden to false on subsequent turns.
+ *
+ * Supports both:
+ * - New JSON format: { "tools": [{ "name": "tool_name" }] }
+ * - Legacy text format: "- tool_name (score: X.XX)"
+ *
+ * @param messages - The conversation message history
+ * @returns Set of tool names that were discovered via tool_search
+ */
+export function extractDiscoveredToolsFromHistory(messages: BaseMessage[]): Set<string> {
+  const discoveredTools = new Set<string>();
+
+  for (const message of messages) {
+    const msgType = message._getType?.() ?? message.constructor?.name ?? '';
+    if (msgType !== 'tool') {
+      continue;
+    }
+
+    const name = (message as { name?: string }).name;
+    if (name !== Constants.TOOL_SEARCH) {
+      continue;
+    }
+
+    const content = message.content;
+    if (typeof content !== 'string') {
+      continue;
+    }
+
+    /** Try JSON format first (new), fall back to regex (legacy) */
+    if (!parseToolSearchJson(content, discoveredTools)) {
+      parseToolSearchLegacy(content, discoveredTools);
+    }
+  }
+
+  return discoveredTools;
+}
+
+/**
+ * Overrides defer_loading to false for tools that were already discovered via tool_search.
+ * This prevents the LLM from having to re-discover tools on every turn.
+ *
+ * @param toolRegistry - The tool registry to modify (mutated in place)
+ * @param discoveredTools - Set of tool names that were previously discovered
+ * @returns Number of tools that had defer_loading overridden
+ */
+export function overrideDeferLoadingForDiscoveredTools(
+  toolRegistry: LCToolRegistry,
+  discoveredTools: Set<string>,
+): number {
+  let overrideCount = 0;
+  for (const toolName of discoveredTools) {
+    const toolDef = toolRegistry.get(toolName);
+    if (toolDef && toolDef.defer_loading === true) {
+      toolDef.defer_loading = false;
+      overrideCount++;
+    }
+  }
+  return overrideCount;
+}
+
 const customProviders = new Set([
   Providers.XAI,
   Providers.DEEPSEEK,
+  Providers.MOONSHOT,
   Providers.OPENROUTER,
   KnownEndpoints.ollama,
 ]);
@@ -48,6 +164,11 @@ type RunAgent = Omit<Agent, 'tools'> & {
   maxContextTokens?: number;
   useLegacyContent?: boolean;
   toolContextMap?: Record<string, string>;
+  toolRegistry?: LCToolRegistry;
+  /** Serializable tool definitions for event-driven execution */
+  toolDefinitions?: LCTool[];
+  /** Precomputed flag indicating if any tools have defer_loading enabled */
+  hasDeferredTools?: boolean;
 };
 
 /**
@@ -60,12 +181,16 @@ type RunAgent = Omit<Agent, 'tools'> & {
  * @param options.customHandlers - Custom event handlers.
  * @param options.streaming - Whether to use streaming.
  * @param options.streamUsage - Whether to stream usage information.
+ * @param options.messages - Optional message history to extract discovered tools from.
+ *   When provided, tools that were previously discovered via tool_search will have
+ *   their defer_loading overridden to false, preventing redundant re-discovery.
  * @returns {Promise<Run<IState>>} A promise that resolves to a new Run instance.
  */
 export async function createRun({
   runId,
   signal,
   agents,
+  messages,
   requestBody,
   user,
   tokenCounter,
@@ -81,9 +206,26 @@ export async function createRun({
   streamUsage?: boolean;
   requestBody?: t.RequestBody;
   user?: IUser;
+  /** Message history for extracting previously discovered tools */
+  messages?: BaseMessage[];
 } & Pick<RunConfig, 'tokenCounter' | 'customHandlers' | 'indexTokenCountMap'>): Promise<
   Run<IState>
 > {
+  /**
+   * Only extract discovered tools if:
+   * 1. We have message history to parse
+   * 2. At least one agent has deferred tools (using precomputed flag)
+   *
+   * This optimization avoids iterating through messages in the ~95% of cases
+   * where no agent uses deferred tool loading.
+   */
+  const hasAnyDeferredTools = agents.some((agent) => agent.hasDeferredTools === true);
+
+  const discoveredTools =
+    hasAnyDeferredTools && messages?.length
+      ? extractDiscoveredToolsFromHistory(messages)
+      : new Set<string>();
+
   const agentInputs: AgentInputs[] = [];
   const buildAgentContext = (agent: RunAgent) => {
     const provider =
@@ -135,17 +277,42 @@ export async function createRun({
       llmConfig.usage = true;
     }
 
+    /**
+     * Override defer_loading for tools that were discovered in previous turns.
+     * This prevents the LLM from having to re-discover tools via tool_search.
+     * Also add the discovered tools' definitions so the LLM has their schemas.
+     */
+    let toolDefinitions = agent.toolDefinitions ?? [];
+    if (discoveredTools.size > 0 && agent.toolRegistry) {
+      overrideDeferLoadingForDiscoveredTools(agent.toolRegistry, discoveredTools);
+
+      /** Add discovered tools' definitions so the LLM can see their schemas */
+      const existingToolNames = new Set(toolDefinitions.map((d) => d.name));
+      for (const toolName of discoveredTools) {
+        if (existingToolNames.has(toolName)) {
+          continue;
+        }
+        const toolDef = agent.toolRegistry.get(toolName);
+        if (toolDef) {
+          toolDefinitions = [...toolDefinitions, toolDef];
+        }
+      }
+    }
+
     const reasoningKey = getReasoningKey(provider, llmConfig, agent.endpoint);
     const agentInput: AgentInputs = {
       provider,
       reasoningKey,
+      toolDefinitions,
       agentId: agent.id,
-      name: agent.name ?? undefined,
       tools: agent.tools,
       clientOptions: llmConfig,
       instructions: systemContent,
+      name: agent.name ?? undefined,
+      toolRegistry: agent.toolRegistry,
       maxContextTokens: agent.maxContextTokens,
       useLegacyContent: agent.useLegacyContent ?? false,
+      discoveredTools: discoveredTools.size > 0 ? Array.from(discoveredTools) : undefined,
     };
     agentInputs.push(agentInput);
   };
diff --git a/packages/api/src/agents/tools.spec.ts b/packages/api/src/agents/tools.spec.ts
new file mode 100644
index 0000000000..49887fbb02
--- /dev/null
+++ b/packages/api/src/agents/tools.spec.ts
@@ -0,0 +1,126 @@
+import { buildToolSet, BuildToolSetConfig } from './tools';
+
+describe('buildToolSet', () => {
+  describe('event-driven mode (toolDefinitions)', () => {
+    it('builds toolSet from toolDefinitions when available', () => {
+      const agentConfig: BuildToolSetConfig = {
+        toolDefinitions: [
+          { name: 'tool_search', description: 'Search for tools' },
+          { name: 'list_commits_mcp_github', description: 'List commits' },
+          { name: 'calculator', description: 'Calculate' },
+        ],
+        tools: [],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+
+      expect(toolSet.size).toBe(3);
+      expect(toolSet.has('tool_search')).toBe(true);
+      expect(toolSet.has('list_commits_mcp_github')).toBe(true);
+      expect(toolSet.has('calculator')).toBe(true);
+    });
+
+    it('includes tool_search in toolSet for deferred tools workflow', () => {
+      const agentConfig: BuildToolSetConfig = {
+        toolDefinitions: [
+          { name: 'tool_search', description: 'Search for deferred tools' },
+          { name: 'deferred_tool_1', description: 'A deferred tool', defer_loading: true },
+          { name: 'deferred_tool_2', description: 'Another deferred tool', defer_loading: true },
+        ],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+
+      expect(toolSet.has('tool_search')).toBe(true);
+      expect(toolSet.has('deferred_tool_1')).toBe(true);
+      expect(toolSet.has('deferred_tool_2')).toBe(true);
+    });
+
+    it('prefers toolDefinitions over tools when both are present', () => {
+      const agentConfig: BuildToolSetConfig = {
+        toolDefinitions: [{ name: 'from_definitions' }],
+        tools: [{ name: 'from_tools' }],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+
+      expect(toolSet.size).toBe(1);
+      expect(toolSet.has('from_definitions')).toBe(true);
+      expect(toolSet.has('from_tools')).toBe(false);
+    });
+  });
+
+  describe('legacy mode (tools)', () => {
+    it('falls back to tools when toolDefinitions is empty', () => {
+      const agentConfig: BuildToolSetConfig = {
+        toolDefinitions: [],
+        tools: [{ name: 'web_search' }, { name: 'calculator' }],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+
+      expect(toolSet.size).toBe(2);
+      expect(toolSet.has('web_search')).toBe(true);
+      expect(toolSet.has('calculator')).toBe(true);
+    });
+
+    it('falls back to tools when toolDefinitions is undefined', () => {
+      const agentConfig: BuildToolSetConfig = {
+        tools: [{ name: 'tool_a' }, { name: 'tool_b' }],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+
+      expect(toolSet.size).toBe(2);
+      expect(toolSet.has('tool_a')).toBe(true);
+      expect(toolSet.has('tool_b')).toBe(true);
+    });
+  });
+
+  describe('edge cases', () => {
+    it('returns empty set when agentConfig is null', () => {
+      const toolSet = buildToolSet(null);
+      expect(toolSet.size).toBe(0);
+    });
+
+    it('returns empty set when agentConfig is undefined', () => {
+      const toolSet = buildToolSet(undefined);
+      expect(toolSet.size).toBe(0);
+    });
+
+    it('returns empty set when both toolDefinitions and tools are empty', () => {
+      const agentConfig: BuildToolSetConfig = {
+        toolDefinitions: [],
+        tools: [],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+      expect(toolSet.size).toBe(0);
+    });
+
+    it('filters out null/undefined tool entries', () => {
+      const agentConfig: BuildToolSetConfig = {
+        tools: [{ name: 'valid_tool' }, null, undefined, { name: 'another_valid' }],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+
+      expect(toolSet.size).toBe(2);
+      expect(toolSet.has('valid_tool')).toBe(true);
+      expect(toolSet.has('another_valid')).toBe(true);
+    });
+
+    it('filters out empty string tool names', () => {
+      const agentConfig: BuildToolSetConfig = {
+        toolDefinitions: [{ name: 'valid' }, { name: '' }, { name: 'also_valid' }],
+      };
+
+      const toolSet = buildToolSet(agentConfig);
+
+      expect(toolSet.size).toBe(2);
+      expect(toolSet.has('valid')).toBe(true);
+      expect(toolSet.has('also_valid')).toBe(true);
+      expect(toolSet.has('')).toBe(false);
+    });
+  });
+});
diff --git a/packages/api/src/agents/tools.ts b/packages/api/src/agents/tools.ts
new file mode 100644
index 0000000000..ad1a724e4f
--- /dev/null
+++ b/packages/api/src/agents/tools.ts
@@ -0,0 +1,39 @@
+interface ToolDefLike {
+  name: string;
+  [key: string]: unknown;
+}
+
+interface ToolInstanceLike {
+  name: string;
+  [key: string]: unknown;
+}
+
+export interface BuildToolSetConfig {
+  toolDefinitions?: ToolDefLike[];
+  tools?: (ToolInstanceLike | null | undefined)[];
+}
+
+/**
+ * Builds a Set of tool names for use with formatAgentMessages.
+ *
+ * In event-driven mode, tools are defined via toolDefinitions (which includes
+ * deferred tools like tool_search). In legacy mode, tools come from loaded
+ * tool instances.
+ *
+ * This ensures tool_search and other deferred tools are included in the toolSet,
+ * allowing their ToolMessages to be preserved in conversation history.
+ */
+export function buildToolSet(agentConfig: BuildToolSetConfig | null | undefined): Set<string> {
+  if (!agentConfig) {
+    return new Set();
+  }
+
+  const { toolDefinitions, tools } = agentConfig;
+
+  const toolNames =
+    toolDefinitions && toolDefinitions.length > 0
+      ? toolDefinitions.map((def) => def.name)
+      : (tools ?? []).map((tool) => tool?.name);
+
+  return new Set(toolNames.filter((name): name is string => Boolean(name)));
+}
diff --git a/packages/api/src/agents/usage.spec.ts b/packages/api/src/agents/usage.spec.ts
new file mode 100644
index 0000000000..9c06567dc4
--- /dev/null
+++ b/packages/api/src/agents/usage.spec.ts
@@ -0,0 +1,434 @@
+import { recordCollectedUsage } from './usage';
+import type { RecordUsageDeps, RecordUsageParams } from './usage';
+import type { UsageMetadata } from '../stream/interfaces/IJobStore';
+
+describe('recordCollectedUsage', () => {
+  let mockSpendTokens: jest.Mock;
+  let mockSpendStructuredTokens: jest.Mock;
+  let deps: RecordUsageDeps;
+
+  const baseParams: Omit<RecordUsageParams, 'collectedUsage'> = {
+    user: 'user-123',
+    conversationId: 'convo-123',
+    model: 'gpt-4',
+    context: 'message',
+    balance: { enabled: true },
+    transactions: { enabled: true },
+  };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    mockSpendTokens = jest.fn().mockResolvedValue(undefined);
+    mockSpendStructuredTokens = jest.fn().mockResolvedValue(undefined);
+    deps = {
+      spendTokens: mockSpendTokens,
+      spendStructuredTokens: mockSpendStructuredTokens,
+    };
+  });
+
+  describe('basic functionality', () => {
+    it('should return undefined if collectedUsage is empty', async () => {
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage: [],
+      });
+
+      expect(result).toBeUndefined();
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+      expect(mockSpendStructuredTokens).not.toHaveBeenCalled();
+    });
+
+    it('should return undefined if collectedUsage is null-ish', async () => {
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage: null as unknown as UsageMetadata[],
+      });
+
+      expect(result).toBeUndefined();
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+    });
+
+    it('should handle single usage entry correctly', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(1);
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        expect.objectContaining({
+          user: 'user-123',
+          conversationId: 'convo-123',
+          model: 'gpt-4',
+          context: 'message',
+        }),
+        { promptTokens: 100, completionTokens: 50 },
+      );
+      expect(result).toEqual({ input_tokens: 100, output_tokens: 50 });
+    });
+
+    it('should skip null entries in collectedUsage', async () => {
+      const collectedUsage = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        null,
+        { input_tokens: 200, output_tokens: 60, model: 'gpt-4' },
+      ] as UsageMetadata[];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(2);
+      expect(result).toEqual({ input_tokens: 100, output_tokens: 110 });
+    });
+  });
+
+  describe('sequential execution (tool calls)', () => {
+    it('should calculate tokens correctly for sequential tool calls', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        { input_tokens: 150, output_tokens: 30, model: 'gpt-4' },
+        { input_tokens: 180, output_tokens: 20, model: 'gpt-4' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(3);
+      expect(result?.output_tokens).toBe(100); // 50 + 30 + 20
+      expect(result?.input_tokens).toBe(100); // First entry's input
+    });
+  });
+
+  describe('parallel execution (multiple agents)', () => {
+    it('should handle parallel agents with independent input tokens', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        { input_tokens: 80, output_tokens: 40, model: 'gpt-4' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(2);
+      expect(result?.output_tokens).toBe(90); // 50 + 40
+      expect(result?.output_tokens).toBeGreaterThan(0);
+    });
+
+    it('should NOT produce negative output_tokens for parallel execution', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 200, output_tokens: 100, model: 'gpt-4' },
+        { input_tokens: 50, output_tokens: 30, model: 'gpt-4' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(result?.output_tokens).toBeGreaterThan(0);
+      expect(result?.output_tokens).toBe(130); // 100 + 30
+    });
+
+    it('should calculate correct total output for multiple parallel agents', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        { input_tokens: 120, output_tokens: 60, model: 'gpt-4-turbo' },
+        { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(3);
+      expect(result?.output_tokens).toBe(150); // 50 + 60 + 40
+    });
+  });
+
+  describe('cache token handling - OpenAI format', () => {
+    it('should use spendStructuredTokens for cache tokens (input_token_details)', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        {
+          input_tokens: 100,
+          output_tokens: 50,
+          model: 'gpt-4',
+          input_token_details: {
+            cache_creation: 20,
+            cache_read: 10,
+          },
+        },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendStructuredTokens).toHaveBeenCalledTimes(1);
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+      expect(mockSpendStructuredTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ model: 'gpt-4' }),
+        {
+          promptTokens: { input: 100, write: 20, read: 10 },
+          completionTokens: 50,
+        },
+      );
+      expect(result?.input_tokens).toBe(130); // 100 + 20 + 10
+    });
+  });
+
+  describe('cache token handling - Anthropic format', () => {
+    it('should use spendStructuredTokens for cache tokens (cache_*_input_tokens)', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        {
+          input_tokens: 100,
+          output_tokens: 50,
+          model: 'claude-3',
+          cache_creation_input_tokens: 25,
+          cache_read_input_tokens: 15,
+        },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendStructuredTokens).toHaveBeenCalledTimes(1);
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+      expect(mockSpendStructuredTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ model: 'claude-3' }),
+        {
+          promptTokens: { input: 100, write: 25, read: 15 },
+          completionTokens: 50,
+        },
+      );
+      expect(result?.input_tokens).toBe(140); // 100 + 25 + 15
+    });
+  });
+
+  describe('mixed cache and non-cache entries', () => {
+    it('should handle mixed entries correctly', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+        {
+          input_tokens: 150,
+          output_tokens: 30,
+          model: 'gpt-4',
+          input_token_details: { cache_creation: 10, cache_read: 5 },
+        },
+        { input_tokens: 200, output_tokens: 20, model: 'gpt-4' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledTimes(2);
+      expect(mockSpendStructuredTokens).toHaveBeenCalledTimes(1);
+      expect(result?.output_tokens).toBe(100); // 50 + 30 + 20
+    });
+  });
+
+  describe('model fallback', () => {
+    it('should use usage.model when available', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4-turbo' },
+      ];
+
+      await recordCollectedUsage(deps, {
+        ...baseParams,
+        model: 'fallback-model',
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ model: 'gpt-4-turbo' }),
+        expect.any(Object),
+      );
+    });
+
+    it('should fallback to param model when usage.model is missing', async () => {
+      const collectedUsage: UsageMetadata[] = [{ input_tokens: 100, output_tokens: 50 }];
+
+      await recordCollectedUsage(deps, {
+        ...baseParams,
+        model: 'param-model',
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ model: 'param-model' }),
+        expect.any(Object),
+      );
+    });
+  });
+
+  describe('real-world scenarios', () => {
+    it('should correctly sum output tokens for sequential tool calls with growing context', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 31596, output_tokens: 151, model: 'claude-opus' },
+        { input_tokens: 35368, output_tokens: 150, model: 'claude-opus' },
+        { input_tokens: 58362, output_tokens: 295, model: 'claude-opus' },
+        { input_tokens: 112604, output_tokens: 193, model: 'claude-opus' },
+        { input_tokens: 257440, output_tokens: 2217, model: 'claude-opus' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(result?.input_tokens).toBe(31596);
+      expect(result?.output_tokens).toBe(3006); // 151 + 150 + 295 + 193 + 2217
+      expect(mockSpendTokens).toHaveBeenCalledTimes(5);
+    });
+
+    it('should handle cache tokens with multiple tool calls', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        {
+          input_tokens: 788,
+          output_tokens: 163,
+          model: 'claude-opus',
+          input_token_details: { cache_read: 0, cache_creation: 30808 },
+        },
+        {
+          input_tokens: 3802,
+          output_tokens: 149,
+          model: 'claude-opus',
+          input_token_details: { cache_read: 30808, cache_creation: 768 },
+        },
+        {
+          input_tokens: 26808,
+          output_tokens: 225,
+          model: 'claude-opus',
+          input_token_details: { cache_read: 31576, cache_creation: 0 },
+        },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      // input_tokens = 788 + 30808 + 0 = 31596
+      expect(result?.input_tokens).toBe(31596);
+      // output_tokens = 163 + 149 + 225 = 537
+      expect(result?.output_tokens).toBe(537);
+      expect(mockSpendStructuredTokens).toHaveBeenCalledTimes(3);
+      expect(mockSpendTokens).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('error handling', () => {
+    it('should catch and log errors from spendTokens without throwing', async () => {
+      mockSpendTokens.mockRejectedValue(new Error('DB error'));
+
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(result).toEqual({ input_tokens: 100, output_tokens: 50 });
+    });
+
+    it('should catch and log errors from spendStructuredTokens without throwing', async () => {
+      mockSpendStructuredTokens.mockRejectedValue(new Error('DB error'));
+
+      const collectedUsage: UsageMetadata[] = [
+        {
+          input_tokens: 100,
+          output_tokens: 50,
+          model: 'gpt-4',
+          input_token_details: { cache_creation: 20, cache_read: 10 },
+        },
+      ];
+
+      const result = await recordCollectedUsage(deps, {
+        ...baseParams,
+        collectedUsage,
+      });
+
+      expect(result).toEqual({ input_tokens: 130, output_tokens: 50 });
+    });
+  });
+
+  describe('transaction metadata', () => {
+    it('should pass all metadata fields to spend functions', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      ];
+
+      const endpointTokenConfig = { 'gpt-4': { prompt: 0.01, completion: 0.03, context: 8192 } };
+
+      await recordCollectedUsage(deps, {
+        ...baseParams,
+        endpointTokenConfig,
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        {
+          user: 'user-123',
+          conversationId: 'convo-123',
+          model: 'gpt-4',
+          context: 'message',
+          balance: { enabled: true },
+          transactions: { enabled: true },
+          endpointTokenConfig,
+        },
+        { promptTokens: 100, completionTokens: 50 },
+      );
+    });
+
+    it('should use default context "message" when not provided', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      ];
+
+      await recordCollectedUsage(deps, {
+        user: 'user-123',
+        conversationId: 'convo-123',
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ context: 'message' }),
+        expect.any(Object),
+      );
+    });
+
+    it('should allow custom context like "title"', async () => {
+      const collectedUsage: UsageMetadata[] = [
+        { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      ];
+
+      await recordCollectedUsage(deps, {
+        ...baseParams,
+        context: 'title',
+        collectedUsage,
+      });
+
+      expect(mockSpendTokens).toHaveBeenCalledWith(
+        expect.objectContaining({ context: 'title' }),
+        expect.any(Object),
+      );
+    });
+  });
+});
diff --git a/packages/api/src/agents/usage.ts b/packages/api/src/agents/usage.ts
new file mode 100644
index 0000000000..545be9195d
--- /dev/null
+++ b/packages/api/src/agents/usage.ts
@@ -0,0 +1,146 @@
+import { logger } from '@librechat/data-schemas';
+import type { TCustomConfig, TTransactionsConfig } from 'librechat-data-provider';
+import type { UsageMetadata } from '../stream/interfaces/IJobStore';
+import type { EndpointTokenConfig } from '../types/tokens';
+
+interface TokenUsage {
+  promptTokens?: number;
+  completionTokens?: number;
+}
+
+interface StructuredPromptTokens {
+  input?: number;
+  write?: number;
+  read?: number;
+}
+
+interface StructuredTokenUsage {
+  promptTokens?: StructuredPromptTokens;
+  completionTokens?: number;
+}
+
+interface TxMetadata {
+  user: string;
+  model?: string;
+  context: string;
+  conversationId: string;
+  balance?: Partial<TCustomConfig['balance']> | null;
+  transactions?: Partial<TTransactionsConfig>;
+  endpointTokenConfig?: EndpointTokenConfig;
+}
+
+type SpendTokensFn = (txData: TxMetadata, tokenUsage: TokenUsage) => Promise<unknown>;
+type SpendStructuredTokensFn = (
+  txData: TxMetadata,
+  tokenUsage: StructuredTokenUsage,
+) => Promise<unknown>;
+
+export interface RecordUsageDeps {
+  spendTokens: SpendTokensFn;
+  spendStructuredTokens: SpendStructuredTokensFn;
+}
+
+export interface RecordUsageParams {
+  user: string;
+  conversationId: string;
+  collectedUsage: UsageMetadata[];
+  model?: string;
+  context?: string;
+  balance?: Partial<TCustomConfig['balance']> | null;
+  transactions?: Partial<TTransactionsConfig>;
+  endpointTokenConfig?: EndpointTokenConfig;
+}
+
+export interface RecordUsageResult {
+  input_tokens: number;
+  output_tokens: number;
+}
+
+/**
+ * Records token usage for collected LLM calls and spends tokens against balance.
+ * This handles both sequential execution (tool calls) and parallel execution (multiple agents).
+ */
+export async function recordCollectedUsage(
+  deps: RecordUsageDeps,
+  params: RecordUsageParams,
+): Promise<RecordUsageResult | undefined> {
+  const {
+    user,
+    model,
+    balance,
+    transactions,
+    conversationId,
+    collectedUsage,
+    endpointTokenConfig,
+    context = 'message',
+  } = params;
+
+  const { spendTokens, spendStructuredTokens } = deps;
+
+  if (!collectedUsage || !collectedUsage.length) {
+    return;
+  }
+
+  const firstUsage = collectedUsage[0];
+  const input_tokens =
+    (firstUsage?.input_tokens || 0) +
+    (Number(firstUsage?.input_token_details?.cache_creation) ||
+      Number(firstUsage?.cache_creation_input_tokens) ||
+      0) +
+    (Number(firstUsage?.input_token_details?.cache_read) ||
+      Number(firstUsage?.cache_read_input_tokens) ||
+      0);
+
+  let total_output_tokens = 0;
+
+  for (const usage of collectedUsage) {
+    if (!usage) {
+      continue;
+    }
+
+    const cache_creation =
+      Number(usage.input_token_details?.cache_creation) ||
+      Number(usage.cache_creation_input_tokens) ||
+      0;
+    const cache_read =
+      Number(usage.input_token_details?.cache_read) || Number(usage.cache_read_input_tokens) || 0;
+
+    total_output_tokens += Number(usage.output_tokens) || 0;
+
+    const txMetadata: TxMetadata = {
+      context,
+      balance,
+      transactions,
+      conversationId,
+      user,
+      endpointTokenConfig,
+      model: usage.model ?? model,
+    };
+
+    if (cache_creation > 0 || cache_read > 0) {
+      spendStructuredTokens(txMetadata, {
+        promptTokens: {
+          input: usage.input_tokens,
+          write: cache_creation,
+          read: cache_read,
+        },
+        completionTokens: usage.output_tokens,
+      }).catch((err) => {
+        logger.error('[packages/api #recordCollectedUsage] Error spending structured tokens', err);
+      });
+      continue;
+    }
+
+    spendTokens(txMetadata, {
+      promptTokens: usage.input_tokens,
+      completionTokens: usage.output_tokens,
+    }).catch((err) => {
+      logger.error('[packages/api #recordCollectedUsage] Error spending tokens', err);
+    });
+  }
+
+  return {
+    input_tokens,
+    output_tokens: total_output_tokens,
+  };
+}
diff --git a/packages/api/src/agents/validation.ts b/packages/api/src/agents/validation.ts
index 4798ffeb80..d427b3639e 100644
--- a/packages/api/src/agents/validation.ts
+++ b/packages/api/src/agents/validation.ts
@@ -51,6 +51,15 @@ export const graphEdgeSchema = z.object({
   promptKey: z.string().optional(),
 });
 
+/** Per-tool options schema (defer_loading, allowed_callers) */
+export const toolOptionsSchema = z.object({
+  defer_loading: z.boolean().optional(),
+  allowed_callers: z.array(z.enum(['direct', 'code_execution'])).optional(),
+});
+
+/** Agent tool options - map of tool_id to tool options */
+export const agentToolOptionsSchema = z.record(z.string(), toolOptionsSchema).optional();
+
 /** Base agent schema with all common fields */
 export const agentBaseSchema = z.object({
   name: z.string().nullable().optional(),
@@ -68,6 +77,7 @@ export const agentBaseSchema = z.object({
   recursion_limit: z.number().optional(),
   conversation_starters: z.array(z.string()).optional(),
   tool_resources: agentToolResourcesSchema,
+  tool_options: agentToolOptionsSchema,
   support_contact: agentSupportContactSchema,
   category: z.string().optional(),
 });
diff --git a/packages/api/src/apiKeys/handlers.ts b/packages/api/src/apiKeys/handlers.ts
new file mode 100644
index 0000000000..61d23ccde9
--- /dev/null
+++ b/packages/api/src/apiKeys/handlers.ts
@@ -0,0 +1,129 @@
+import type { Request, Response } from 'express';
+import type { Types } from 'mongoose';
+import { logger } from '@librechat/data-schemas';
+
+export interface ApiKeyHandlerDependencies {
+  createAgentApiKey: (params: {
+    userId: string | Types.ObjectId;
+    name: string;
+    expiresAt?: Date | null;
+  }) => Promise<{
+    id: string;
+    name: string;
+    key: string;
+    keyPrefix: string;
+    createdAt: Date;
+    expiresAt?: Date;
+  }>;
+  listAgentApiKeys: (userId: string | Types.ObjectId) => Promise<
+    Array<{
+      id: string;
+      name: string;
+      keyPrefix: string;
+      lastUsedAt?: Date;
+      expiresAt?: Date;
+      createdAt: Date;
+    }>
+  >;
+  deleteAgentApiKey: (
+    keyId: string | Types.ObjectId,
+    userId: string | Types.ObjectId,
+  ) => Promise<boolean>;
+  getAgentApiKeyById: (
+    keyId: string | Types.ObjectId,
+    userId: string | Types.ObjectId,
+  ) => Promise<{
+    id: string;
+    name: string;
+    keyPrefix: string;
+    lastUsedAt?: Date;
+    expiresAt?: Date;
+    createdAt: Date;
+  } | null>;
+}
+
+interface AuthenticatedRequest extends Request {
+  user?: {
+    id: string;
+    _id: Types.ObjectId;
+  };
+}
+
+export function createApiKeyHandlers(deps: ApiKeyHandlerDependencies) {
+  async function createApiKey(req: AuthenticatedRequest, res: Response) {
+    try {
+      const { name, expiresAt } = req.body;
+
+      if (!name || typeof name !== 'string' || name.trim() === '') {
+        return res.status(400).json({
+          error: 'API key name is required',
+        });
+      }
+
+      const result = await deps.createAgentApiKey({
+        userId: req.user?.id || '',
+        name: name.trim(),
+        expiresAt: expiresAt ? new Date(expiresAt) : null,
+      });
+
+      res.status(201).json({
+        id: result.id,
+        name: result.name,
+        key: result.key,
+        keyPrefix: result.keyPrefix,
+        createdAt: result.createdAt,
+        expiresAt: result.expiresAt,
+      });
+    } catch (error) {
+      logger.error('[createApiKey] Error creating API key:', error);
+      res.status(500).json({ error: 'Failed to create API key' });
+    }
+  }
+
+  async function listApiKeys(req: AuthenticatedRequest, res: Response) {
+    try {
+      const keys = await deps.listAgentApiKeys(req.user?.id || '');
+      res.status(200).json({ keys });
+    } catch (error) {
+      logger.error('[listApiKeys] Error listing API keys:', error);
+      res.status(500).json({ error: 'Failed to list API keys' });
+    }
+  }
+
+  async function getApiKey(req: AuthenticatedRequest, res: Response) {
+    try {
+      const key = await deps.getAgentApiKeyById(req.params.id, req.user?.id || '');
+
+      if (!key) {
+        return res.status(404).json({ error: 'API key not found' });
+      }
+
+      res.status(200).json(key);
+    } catch (error) {
+      logger.error('[getApiKey] Error getting API key:', error);
+      res.status(500).json({ error: 'Failed to get API key' });
+    }
+  }
+
+  async function deleteApiKey(req: AuthenticatedRequest, res: Response) {
+    try {
+      const deleted = await deps.deleteAgentApiKey(req.params.id, req.user?.id || '');
+
+      if (!deleted) {
+        return res.status(404).json({ error: 'API key not found' });
+      }
+
+      res.status(204).send();
+    } catch (error) {
+      logger.error('[deleteApiKey] Error deleting API key:', error);
+      res.status(500).json({ error: 'Failed to delete API key' });
+    }
+  }
+
+  return {
+    createApiKey,
+    listApiKeys,
+    getApiKey,
+    deleteApiKey,
+  };
+}
diff --git a/packages/api/src/apiKeys/index.ts b/packages/api/src/apiKeys/index.ts
new file mode 100644
index 0000000000..69fd7b5c1a
--- /dev/null
+++ b/packages/api/src/apiKeys/index.ts
@@ -0,0 +1,4 @@
+export * from './service';
+export * from './middleware';
+export * from './handlers';
+export * from './permissions';
diff --git a/packages/api/src/apiKeys/middleware.ts b/packages/api/src/apiKeys/middleware.ts
new file mode 100644
index 0000000000..2a50353648
--- /dev/null
+++ b/packages/api/src/apiKeys/middleware.ts
@@ -0,0 +1,163 @@
+import { logger } from '@librechat/data-schemas';
+import { ResourceType, PermissionBits, hasPermissions } from 'librechat-data-provider';
+import type { Request, Response, NextFunction } from 'express';
+import type { IUser } from '@librechat/data-schemas';
+import type { Types } from 'mongoose';
+import { getRemoteAgentPermissions } from './service';
+
+export interface ApiKeyAuthDependencies {
+  validateAgentApiKey: (apiKey: string) => Promise<{
+    userId: Types.ObjectId;
+    keyId: Types.ObjectId;
+  } | null>;
+  findUser: (query: { _id: string | Types.ObjectId }) => Promise<IUser | null>;
+}
+
+export interface RemoteAgentAccessDependencies {
+  getAgent: (query: {
+    id: string;
+  }) => Promise<{ _id: Types.ObjectId; [key: string]: unknown } | null>;
+  getEffectivePermissions: (params: {
+    userId: string;
+    role?: string;
+    resourceType: ResourceType;
+    resourceId: string | Types.ObjectId;
+  }) => Promise<number>;
+}
+
+export interface ApiKeyAuthRequest extends Request {
+  user?: IUser & { id: string };
+  apiKeyId?: Types.ObjectId;
+}
+
+export interface RemoteAgentAccessRequest extends ApiKeyAuthRequest {
+  agent?: { _id: Types.ObjectId; [key: string]: unknown };
+  agentPermissions?: number;
+}
+
+export function createRequireApiKeyAuth(deps: ApiKeyAuthDependencies) {
+  return async (req: ApiKeyAuthRequest, res: Response, next: NextFunction) => {
+    const authHeader = req.headers.authorization;
+
+    if (!authHeader || !authHeader.startsWith('Bearer ')) {
+      return res.status(401).json({
+        error: {
+          message: 'Missing or invalid Authorization header. Expected: Bearer <api_key>',
+          type: 'invalid_request_error',
+          code: 'missing_api_key',
+        },
+      });
+    }
+
+    const apiKey = authHeader.slice(7);
+
+    if (!apiKey || apiKey.trim() === '') {
+      return res.status(401).json({
+        error: {
+          message: 'API key is required',
+          type: 'invalid_request_error',
+          code: 'missing_api_key',
+        },
+      });
+    }
+
+    try {
+      const keyValidation = await deps.validateAgentApiKey(apiKey);
+
+      if (!keyValidation) {
+        return res.status(401).json({
+          error: {
+            message: 'Invalid API key',
+            type: 'invalid_request_error',
+            code: 'invalid_api_key',
+          },
+        });
+      }
+
+      const user = await deps.findUser({ _id: keyValidation.userId });
+
+      if (!user) {
+        return res.status(401).json({
+          error: {
+            message: 'User not found for this API key',
+            type: 'invalid_request_error',
+            code: 'invalid_api_key',
+          },
+        });
+      }
+
+      user.id = (user._id as Types.ObjectId).toString();
+      req.user = user as IUser & { id: string };
+      req.apiKeyId = keyValidation.keyId;
+
+      next();
+    } catch (error) {
+      logger.error('[requireApiKeyAuth] Error validating API key:', error);
+      return res.status(500).json({
+        error: {
+          message: 'Internal server error during authentication',
+          type: 'server_error',
+          code: 'internal_error',
+        },
+      });
+    }
+  };
+}
+
+export function createCheckRemoteAgentAccess(deps: RemoteAgentAccessDependencies) {
+  return async (req: RemoteAgentAccessRequest, res: Response, next: NextFunction) => {
+    const agentId = req.body?.model || req.params?.model;
+
+    if (!agentId) {
+      return res.status(400).json({
+        error: {
+          message: 'Model (agent ID) is required',
+          type: 'invalid_request_error',
+          code: 'missing_model',
+        },
+      });
+    }
+
+    try {
+      const agent = await deps.getAgent({ id: agentId });
+
+      if (!agent) {
+        return res.status(404).json({
+          error: {
+            message: `Agent not found: ${agentId}`,
+            type: 'invalid_request_error',
+            code: 'model_not_found',
+          },
+        });
+      }
+
+      const userId = req.user?.id || '';
+
+      const permissions = await getRemoteAgentPermissions(deps, userId, req.user?.role, agent._id);
+
+      if (!hasPermissions(permissions, PermissionBits.VIEW)) {
+        return res.status(403).json({
+          error: {
+            message: `No remote access to agent: ${agentId}`,
+            type: 'permission_error',
+            code: 'access_denied',
+          },
+        });
+      }
+
+      req.agent = agent;
+      req.agentPermissions = permissions;
+
+      next();
+    } catch (error) {
+      logger.error('[checkRemoteAgentAccess] Error checking agent access:', error);
+      return res.status(500).json({
+        error: {
+          message: 'Internal server error while checking agent access',
+          type: 'server_error',
+          code: 'internal_error',
+        },
+      });
+    }
+  };
+}
diff --git a/packages/api/src/apiKeys/permissions.ts b/packages/api/src/apiKeys/permissions.ts
new file mode 100644
index 0000000000..2556f25b57
--- /dev/null
+++ b/packages/api/src/apiKeys/permissions.ts
@@ -0,0 +1,169 @@
+import {
+  ResourceType,
+  PrincipalType,
+  PermissionBits,
+  AccessRoleIds,
+} from 'librechat-data-provider';
+import type { Types, Model } from 'mongoose';
+
+export interface Principal {
+  type: string;
+  id: string;
+  name: string;
+  email?: string;
+  avatar?: string;
+  source?: string;
+  idOnTheSource?: string;
+  accessRoleId: string;
+  isImplicit?: boolean;
+}
+
+export interface EnricherDependencies {
+  AclEntry: Model<{
+    principalType: string;
+    principalId: Types.ObjectId;
+    resourceType: string;
+    resourceId: Types.ObjectId;
+    permBits: number;
+    roleId: Types.ObjectId;
+    grantedBy: Types.ObjectId;
+    grantedAt: Date;
+  }>;
+  AccessRole: Model<{
+    accessRoleId: string;
+    permBits: number;
+  }>;
+  logger: { error: (msg: string, ...args: unknown[]) => void };
+}
+
+export interface EnrichResult {
+  principals: Principal[];
+  entriesToBackfill: Types.ObjectId[];
+}
+
+/** Enriches REMOTE_AGENT principals with implicit AGENT owners */
+export async function enrichRemoteAgentPrincipals(
+  deps: EnricherDependencies,
+  resourceId: string | Types.ObjectId,
+  principals: Principal[],
+): Promise<EnrichResult> {
+  const { AclEntry } = deps;
+
+  const resourceObjectId =
+    typeof resourceId === 'string' && /^[a-f\d]{24}$/i.test(resourceId)
+      ? deps.AclEntry.base.Types.ObjectId.createFromHexString(resourceId)
+      : resourceId;
+
+  const agentOwnerEntries = await AclEntry.aggregate([
+    {
+      $match: {
+        resourceType: ResourceType.AGENT,
+        resourceId: resourceObjectId,
+        principalType: PrincipalType.USER,
+        permBits: { $bitsAllSet: PermissionBits.SHARE },
+      },
+    },
+    {
+      $lookup: {
+        from: 'users',
+        localField: 'principalId',
+        foreignField: '_id',
+        as: 'userInfo',
+      },
+    },
+    {
+      $project: {
+        principalId: 1,
+        userInfo: { $arrayElemAt: ['$userInfo', 0] },
+      },
+    },
+  ]);
+
+  const enrichedPrincipals = [...principals];
+  const entriesToBackfill: Types.ObjectId[] = [];
+
+  for (const entry of agentOwnerEntries) {
+    if (!entry.userInfo) {
+      continue;
+    }
+
+    const alreadyIncluded = enrichedPrincipals.some(
+      (p) => p.type === PrincipalType.USER && p.id === entry.principalId.toString(),
+    );
+
+    if (!alreadyIncluded) {
+      enrichedPrincipals.unshift({
+        type: PrincipalType.USER,
+        id: entry.userInfo._id.toString(),
+        name: entry.userInfo.name || entry.userInfo.username,
+        email: entry.userInfo.email,
+        avatar: entry.userInfo.avatar,
+        source: 'local',
+        idOnTheSource: entry.userInfo.idOnTheSource || entry.userInfo._id.toString(),
+        accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+        isImplicit: true,
+      });
+
+      entriesToBackfill.push(entry.principalId);
+    }
+  }
+
+  return { principals: enrichedPrincipals, entriesToBackfill };
+}
+
+/** Backfills REMOTE_AGENT ACL entries for AGENT owners (fire-and-forget) */
+export function backfillRemoteAgentPermissions(
+  deps: EnricherDependencies,
+  resourceId: string | Types.ObjectId,
+  entriesToBackfill: Types.ObjectId[],
+): void {
+  if (entriesToBackfill.length === 0) {
+    return;
+  }
+
+  const { AclEntry, AccessRole, logger } = deps;
+
+  const resourceObjectId =
+    typeof resourceId === 'string' && /^[a-f\d]{24}$/i.test(resourceId)
+      ? AclEntry.base.Types.ObjectId.createFromHexString(resourceId)
+      : resourceId;
+
+  AccessRole.findOne({ accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER })
+    .lean()
+    .then((role) => {
+      if (!role) {
+        logger.error('[backfillRemoteAgentPermissions] REMOTE_AGENT_OWNER role not found');
+        return;
+      }
+
+      const bulkOps = entriesToBackfill.map((principalId) => ({
+        updateOne: {
+          filter: {
+            principalType: PrincipalType.USER,
+            principalId,
+            resourceType: ResourceType.REMOTE_AGENT,
+            resourceId: resourceObjectId,
+          },
+          update: {
+            $setOnInsert: {
+              principalType: PrincipalType.USER,
+              principalId,
+              principalModel: 'User',
+              resourceType: ResourceType.REMOTE_AGENT,
+              resourceId: resourceObjectId,
+              permBits: role.permBits,
+              roleId: role._id,
+              grantedBy: principalId,
+              grantedAt: new Date(),
+            },
+          },
+          upsert: true,
+        },
+      }));
+
+      return AclEntry.bulkWrite(bulkOps, { ordered: false });
+    })
+    .catch((err) => {
+      logger.error('[backfillRemoteAgentPermissions] Failed to backfill:', err);
+    });
+}
diff --git a/packages/api/src/apiKeys/service.ts b/packages/api/src/apiKeys/service.ts
new file mode 100644
index 0000000000..30ae0afb53
--- /dev/null
+++ b/packages/api/src/apiKeys/service.ts
@@ -0,0 +1,146 @@
+import { createMethods } from '@librechat/data-schemas';
+import { ResourceType, PermissionBits, hasPermissions } from 'librechat-data-provider';
+import type { AllMethods, IUser } from '@librechat/data-schemas';
+import type { Types } from 'mongoose';
+
+export interface ApiKeyServiceDependencies {
+  validateAgentApiKey: AllMethods['validateAgentApiKey'];
+  createAgentApiKey: AllMethods['createAgentApiKey'];
+  listAgentApiKeys: AllMethods['listAgentApiKeys'];
+  deleteAgentApiKey: AllMethods['deleteAgentApiKey'];
+  getAgentApiKeyById: AllMethods['getAgentApiKeyById'];
+  findUser: (query: { _id: string | Types.ObjectId }) => Promise<IUser | null>;
+}
+
+export interface RemoteAgentAccessResult {
+  hasAccess: boolean;
+  permissions: number;
+  agent: { _id: Types.ObjectId; [key: string]: unknown } | null;
+}
+
+export class AgentApiKeyService {
+  private deps: ApiKeyServiceDependencies;
+
+  constructor(deps: ApiKeyServiceDependencies) {
+    this.deps = deps;
+  }
+
+  async validateApiKey(apiKey: string): Promise<{
+    userId: Types.ObjectId;
+    keyId: Types.ObjectId;
+  } | null> {
+    return this.deps.validateAgentApiKey(apiKey);
+  }
+
+  async createApiKey(params: {
+    userId: string | Types.ObjectId;
+    name: string;
+    expiresAt?: Date | null;
+  }) {
+    return this.deps.createAgentApiKey(params);
+  }
+
+  async listApiKeys(userId: string | Types.ObjectId) {
+    return this.deps.listAgentApiKeys(userId);
+  }
+
+  async deleteApiKey(keyId: string | Types.ObjectId, userId: string | Types.ObjectId) {
+    return this.deps.deleteAgentApiKey(keyId, userId);
+  }
+
+  async getApiKeyById(keyId: string | Types.ObjectId, userId: string | Types.ObjectId) {
+    return this.deps.getAgentApiKeyById(keyId, userId);
+  }
+
+  async getUserFromApiKey(apiKey: string): Promise<IUser | null> {
+    const keyValidation = await this.validateApiKey(apiKey);
+    if (!keyValidation) {
+      return null;
+    }
+
+    return this.deps.findUser({ _id: keyValidation.userId });
+  }
+}
+
+export function createApiKeyServiceDependencies(
+  mongoose: typeof import('mongoose'),
+): ApiKeyServiceDependencies {
+  const methods = createMethods(mongoose);
+  return {
+    validateAgentApiKey: methods.validateAgentApiKey,
+    createAgentApiKey: methods.createAgentApiKey,
+    listAgentApiKeys: methods.listAgentApiKeys,
+    deleteAgentApiKey: methods.deleteAgentApiKey,
+    getAgentApiKeyById: methods.getAgentApiKeyById,
+    findUser: methods.findUser,
+  };
+}
+
+export interface GetRemoteAgentPermissionsDeps {
+  getEffectivePermissions: (params: {
+    userId: string;
+    role?: string;
+    resourceType: ResourceType;
+    resourceId: string | Types.ObjectId;
+  }) => Promise<number>;
+}
+
+/** AGENT owners automatically have full REMOTE_AGENT permissions */
+export async function getRemoteAgentPermissions(
+  deps: GetRemoteAgentPermissionsDeps,
+  userId: string,
+  role: string | undefined,
+  resourceId: string | Types.ObjectId,
+): Promise<number> {
+  const agentPerms = await deps.getEffectivePermissions({
+    userId,
+    role,
+    resourceType: ResourceType.AGENT,
+    resourceId,
+  });
+
+  if (hasPermissions(agentPerms, PermissionBits.SHARE)) {
+    return PermissionBits.VIEW | PermissionBits.EDIT | PermissionBits.DELETE | PermissionBits.SHARE;
+  }
+
+  return deps.getEffectivePermissions({
+    userId,
+    role,
+    resourceType: ResourceType.REMOTE_AGENT,
+    resourceId,
+  });
+}
+
+export async function checkRemoteAgentAccess(params: {
+  userId: string;
+  role?: string;
+  agentId: string;
+  getAgent: (query: {
+    id: string;
+  }) => Promise<{ _id: Types.ObjectId; [key: string]: unknown } | null>;
+  getEffectivePermissions: (params: {
+    userId: string;
+    role?: string;
+    resourceType: ResourceType;
+    resourceId: string | Types.ObjectId;
+  }) => Promise<number>;
+}): Promise<RemoteAgentAccessResult> {
+  const { userId, role, agentId, getAgent, getEffectivePermissions } = params;
+
+  const agent = await getAgent({ id: agentId });
+
+  if (!agent) {
+    return { hasAccess: false, permissions: 0, agent: null };
+  }
+
+  const permissions = await getRemoteAgentPermissions(
+    { getEffectivePermissions },
+    userId,
+    role,
+    agent._id,
+  );
+
+  const hasAccess = hasPermissions(permissions, PermissionBits.VIEW);
+
+  return { hasAccess, permissions, agent };
+}
diff --git a/packages/api/src/app/AppService.spec.ts b/packages/api/src/app/AppService.spec.ts
index 9c771b4bd6..a7b5a46054 100644
--- a/packages/api/src/app/AppService.spec.ts
+++ b/packages/api/src/app/AppService.spec.ts
@@ -611,6 +611,78 @@ describe('AppService', () => {
     );
   });
 
+  it('should correctly configure Bedrock endpoint with models and inferenceProfiles', async () => {
+    const config: Partial<TCustomConfig> = {
+      endpoints: {
+        [EModelEndpoint.bedrock]: {
+          models: [
+            'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+            'us.anthropic.claude-sonnet-4-5-20250929-v1:0',
+            'global.anthropic.claude-opus-4-5-20251101-v1:0',
+          ],
+          inferenceProfiles: {
+            'us.anthropic.claude-3-7-sonnet-20250219-v1:0':
+              'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123',
+            'us.anthropic.claude-sonnet-4-5-20250929-v1:0': '${BEDROCK_SONNET_45_PROFILE}',
+          },
+          availableRegions: ['us-east-1', 'us-west-2'],
+          titleConvo: true,
+          titleModel: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      },
+    };
+
+    const result = await AppService({ config });
+
+    expect(result).toEqual(
+      expect.objectContaining({
+        endpoints: expect.objectContaining({
+          [EModelEndpoint.bedrock]: expect.objectContaining({
+            models: expect.arrayContaining([
+              'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+              'us.anthropic.claude-sonnet-4-5-20250929-v1:0',
+              'global.anthropic.claude-opus-4-5-20251101-v1:0',
+            ]),
+            inferenceProfiles: expect.objectContaining({
+              'us.anthropic.claude-3-7-sonnet-20250219-v1:0':
+                'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123',
+              'us.anthropic.claude-sonnet-4-5-20250929-v1:0': '${BEDROCK_SONNET_45_PROFILE}',
+            }),
+            availableRegions: expect.arrayContaining(['us-east-1', 'us-west-2']),
+            titleConvo: true,
+            titleModel: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+          }),
+        }),
+      }),
+    );
+  });
+
+  it('should configure Bedrock endpoint with only inferenceProfiles (no models array)', async () => {
+    const config: Partial<TCustomConfig> = {
+      endpoints: {
+        [EModelEndpoint.bedrock]: {
+          inferenceProfiles: {
+            'us.anthropic.claude-3-7-sonnet-20250219-v1:0': '${BEDROCK_INFERENCE_PROFILE_ARN}',
+          },
+        },
+      },
+    };
+
+    const result = await AppService({ config });
+
+    expect(result).toEqual(
+      expect.objectContaining({
+        endpoints: expect.objectContaining({
+          [EModelEndpoint.bedrock]: expect.objectContaining({
+            inferenceProfiles: expect.objectContaining({
+              'us.anthropic.claude-3-7-sonnet-20250219-v1:0': '${BEDROCK_INFERENCE_PROFILE_ARN}',
+            }),
+          }),
+        }),
+      }),
+    );
+  });
+
   it('should correctly configure all endpoint when specified', async () => {
     const config: Partial<TCustomConfig> = {
       endpoints: {
diff --git a/packages/api/src/app/config.test.ts b/packages/api/src/app/config.test.ts
index f85bb8a62c..3e2ee6d143 100644
--- a/packages/api/src/app/config.test.ts
+++ b/packages/api/src/app/config.test.ts
@@ -1,7 +1,7 @@
-import { getTransactionsConfig, getBalanceConfig } from './config';
+import { getTransactionsConfig, getBalanceConfig, getCustomEndpointConfig } from './config';
 import { logger } from '@librechat/data-schemas';
-import { FileSources } from 'librechat-data-provider';
-import type { TCustomConfig } from 'librechat-data-provider';
+import { FileSources, EModelEndpoint } from 'librechat-data-provider';
+import type { TCustomConfig, TEndpoint } from 'librechat-data-provider';
 import type { AppConfig } from '@librechat/data-schemas';
 
 // Helper function to create a minimal AppConfig for testing
@@ -282,3 +282,75 @@ describe('getBalanceConfig', () => {
     });
   });
 });
+
+describe('getCustomEndpointConfig', () => {
+  describe('when appConfig is not provided', () => {
+    it('should throw an error', () => {
+      expect(() => getCustomEndpointConfig({ endpoint: 'test' })).toThrow(
+        'Config not found for the test custom endpoint.',
+      );
+    });
+  });
+
+  describe('when appConfig is provided', () => {
+    it('should return undefined when no custom endpoints are configured', () => {
+      const appConfig = createTestAppConfig();
+      const result = getCustomEndpointConfig({ endpoint: 'test', appConfig });
+      expect(result).toBeUndefined();
+    });
+
+    it('should return the matching endpoint config when found', () => {
+      const appConfig = createTestAppConfig({
+        endpoints: {
+          [EModelEndpoint.custom]: [
+            {
+              name: 'TestEndpoint',
+              apiKey: 'test-key',
+            } as TEndpoint,
+          ],
+        },
+      });
+
+      const result = getCustomEndpointConfig({ endpoint: 'TestEndpoint', appConfig });
+      expect(result).toEqual({
+        name: 'TestEndpoint',
+        apiKey: 'test-key',
+      });
+    });
+
+    it('should handle case-insensitive matching for Ollama endpoint', () => {
+      const appConfig = createTestAppConfig({
+        endpoints: {
+          [EModelEndpoint.custom]: [
+            {
+              name: 'Ollama',
+              apiKey: 'ollama-key',
+            } as TEndpoint,
+          ],
+        },
+      });
+
+      const result = getCustomEndpointConfig({ endpoint: 'Ollama', appConfig });
+      expect(result).toEqual({
+        name: 'Ollama',
+        apiKey: 'ollama-key',
+      });
+    });
+
+    it('should handle mixed case endpoint names', () => {
+      const appConfig = createTestAppConfig({
+        endpoints: {
+          [EModelEndpoint.custom]: [
+            {
+              name: 'CustomAI',
+              apiKey: 'custom-key',
+            } as TEndpoint,
+          ],
+        },
+      });
+
+      const result = getCustomEndpointConfig({ endpoint: 'customai', appConfig });
+      expect(result).toBeUndefined();
+    });
+  });
+});
diff --git a/packages/api/src/app/config.ts b/packages/api/src/app/config.ts
index 38144dee2b..0a2fb3e6f9 100644
--- a/packages/api/src/app/config.ts
+++ b/packages/api/src/app/config.ts
@@ -64,7 +64,7 @@ export const getCustomEndpointConfig = ({
 
   const customEndpoints = appConfig.endpoints?.[EModelEndpoint.custom] ?? [];
   return customEndpoints.find(
-    (endpointConfig) => normalizeEndpointName(endpointConfig.name) === endpoint,
+    (endpointConfig) => normalizeEndpointName(endpointConfig.name) === normalizeEndpointName(endpoint),
   );
 };
 
diff --git a/packages/api/src/app/permissions.spec.ts b/packages/api/src/app/permissions.spec.ts
index b84ad63498..86d0c83095 100644
--- a/packages/api/src/app/permissions.spec.ts
+++ b/packages/api/src/app/permissions.spec.ts
@@ -100,6 +100,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: false,
+        [Permissions.CREATE]: false,
+        [Permissions.SHARE]: false,
+        [Permissions.SHARE_PUBLIC]: false,
+      },
     };
 
     const expectedPermissionsForAdmin = {
@@ -141,6 +147,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     };
 
     expect(mockUpdateAccessPermissions).toHaveBeenCalledTimes(2);
@@ -246,6 +258,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: false,
+        [Permissions.CREATE]: false,
+        [Permissions.SHARE]: false,
+        [Permissions.SHARE_PUBLIC]: false,
+      },
     };
 
     const expectedPermissionsForAdmin = {
@@ -287,6 +305,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     };
 
     expect(mockUpdateAccessPermissions).toHaveBeenCalledTimes(2);
@@ -378,6 +402,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: false,
+        [Permissions.CREATE]: false,
+        [Permissions.SHARE]: false,
+        [Permissions.SHARE_PUBLIC]: false,
+      },
     };
 
     const expectedPermissionsForAdmin = {
@@ -419,6 +449,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: true,
         [Permissions.SHARE_PUBLIC]: true,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     };
 
     expect(mockUpdateAccessPermissions).toHaveBeenCalledTimes(2);
@@ -523,6 +559,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: false,
+        [Permissions.CREATE]: false,
+        [Permissions.SHARE]: false,
+        [Permissions.SHARE_PUBLIC]: false,
+      },
     };
 
     const expectedPermissionsForAdmin = {
@@ -564,6 +606,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: true,
         [Permissions.SHARE_PUBLIC]: true,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     };
 
     expect(mockUpdateAccessPermissions).toHaveBeenCalledTimes(2);
@@ -655,6 +703,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: false,
+        [Permissions.CREATE]: false,
+        [Permissions.SHARE]: false,
+        [Permissions.SHARE_PUBLIC]: false,
+      },
     };
 
     const expectedPermissionsForAdmin = {
@@ -696,6 +750,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: true,
         [Permissions.SHARE_PUBLIC]: true,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     };
 
     expect(mockUpdateAccessPermissions).toHaveBeenCalledTimes(2);
@@ -784,6 +844,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: false,
+        [Permissions.CREATE]: false,
+        [Permissions.SHARE]: false,
+        [Permissions.SHARE_PUBLIC]: false,
+      },
     };
 
     const expectedPermissionsForAdmin = {
@@ -813,6 +879,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: true,
         [Permissions.SHARE_PUBLIC]: true,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     };
 
     expect(mockUpdateAccessPermissions).toHaveBeenCalledTimes(2);
@@ -890,9 +962,7 @@ describe('updateInterfacePermissions - permissions', () => {
     const expectedPermissionsForUser = {
       [PermissionTypes.PROMPTS]: {
         [Permissions.USE]: true,
-        [Permissions.CREATE]: true,
-        [Permissions.SHARE]: false,
-        [Permissions.SHARE_PUBLIC]: false,
+        // CREATE/SHARE/SHARE_PUBLIC not included since prompts: true is boolean and PROMPTS already exists
       }, // Explicitly configured
       // All other permissions that don't exist in the database
       [PermissionTypes.MEMORIES]: {
@@ -920,14 +990,18 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: false,
         [Permissions.SHARE_PUBLIC]: false,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: false,
+        [Permissions.CREATE]: false,
+        [Permissions.SHARE]: false,
+        [Permissions.SHARE_PUBLIC]: false,
+      },
     };
 
     const expectedPermissionsForAdmin = {
       [PermissionTypes.PROMPTS]: {
         [Permissions.USE]: true,
-        [Permissions.CREATE]: true,
-        [Permissions.SHARE]: true,
-        [Permissions.SHARE_PUBLIC]: true,
+        // CREATE/SHARE/SHARE_PUBLIC not included since prompts: true is boolean and PROMPTS already exists
       }, // Explicitly configured
       // All other permissions that don't exist in the database
       [PermissionTypes.MEMORIES]: {
@@ -955,6 +1029,12 @@ describe('updateInterfacePermissions - permissions', () => {
         [Permissions.SHARE]: true,
         [Permissions.SHARE_PUBLIC]: true,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     };
 
     expect(mockUpdateAccessPermissions).toHaveBeenCalledTimes(2);
@@ -1376,11 +1456,9 @@ describe('updateInterfacePermissions - permissions', () => {
     );
 
     // Explicitly configured permissions should be updated
+    // CREATE/SHARE/SHARE_PUBLIC not included since prompts: true is boolean and PROMPTS already exists
     expect(userCall[1][PermissionTypes.PROMPTS]).toEqual({
       [Permissions.USE]: true,
-      [Permissions.CREATE]: true,
-      [Permissions.SHARE]: false,
-      [Permissions.SHARE_PUBLIC]: false,
     });
     expect(userCall[1][PermissionTypes.BOOKMARKS]).toEqual({ [Permissions.USE]: true });
     expect(userCall[1][PermissionTypes.MARKETPLACE]).toEqual({ [Permissions.USE]: true });
@@ -1701,12 +1779,9 @@ describe('updateInterfacePermissions - permissions', () => {
     );
     // Memory permissions should be updated even though they already exist
     expect(userCall[1][PermissionTypes.MEMORIES]).toEqual(expectedMemoryPermissions);
-    // Prompts should be updated (explicitly configured)
+    // Prompts should be updated (explicitly configured) - CREATE/SHARE/SHARE_PUBLIC not included since prompts: true is boolean and PROMPTS already exists
     expect(userCall[1][PermissionTypes.PROMPTS]).toEqual({
       [Permissions.USE]: true,
-      [Permissions.CREATE]: true,
-      [Permissions.SHARE]: false,
-      [Permissions.SHARE_PUBLIC]: false,
     });
     // Bookmarks should be updated (explicitly configured)
     expect(userCall[1][PermissionTypes.BOOKMARKS]).toEqual({ [Permissions.USE]: true });
@@ -1717,11 +1792,9 @@ describe('updateInterfacePermissions - permissions', () => {
     );
     // Memory permissions should be updated even though they already exist
     expect(adminCall[1][PermissionTypes.MEMORIES]).toEqual(expectedMemoryPermissions);
+    // CREATE/SHARE/SHARE_PUBLIC not included since prompts: true is boolean and PROMPTS already exists
     expect(adminCall[1][PermissionTypes.PROMPTS]).toEqual({
       [Permissions.USE]: true,
-      [Permissions.CREATE]: true,
-      [Permissions.SHARE]: true,
-      [Permissions.SHARE_PUBLIC]: true,
     });
     expect(adminCall[1][PermissionTypes.BOOKMARKS]).toEqual({ [Permissions.USE]: true });
 
@@ -1737,4 +1810,199 @@ describe('updateInterfacePermissions - permissions', () => {
       }),
     });
   });
+
+  it('should preserve existing SHARE/SHARE_PUBLIC values when using boolean config (regression test)', async () => {
+    // This test ensures that when `agents: true` (boolean) is configured,
+    // existing SHARE and SHARE_PUBLIC permissions are NOT reset to defaults.
+
+    // Mock existing permissions where SHARE and SHARE_PUBLIC were enabled by user
+    mockGetRoleByName.mockResolvedValue({
+      permissions: {
+        [PermissionTypes.AGENTS]: {
+          [Permissions.USE]: true,
+          [Permissions.CREATE]: true,
+          [Permissions.SHARE]: true, // User enabled this via admin panel
+          [Permissions.SHARE_PUBLIC]: true, // User enabled this via admin panel
+        },
+        [PermissionTypes.PROMPTS]: {
+          [Permissions.USE]: true,
+          [Permissions.CREATE]: true,
+          [Permissions.SHARE]: true,
+          [Permissions.SHARE_PUBLIC]: true,
+        },
+      },
+    });
+
+    // Config uses boolean (not object), simulating `agents: true` in librechat.yaml
+    const config = {
+      interface: {
+        agents: true, // Boolean config - should only update USE, not reset SHARE/SHARE_PUBLIC
+        prompts: true, // Boolean config - should only update USE, not reset SHARE/SHARE_PUBLIC
+      },
+    };
+    const configDefaults = {
+      interface: {
+        agents: true,
+        prompts: true,
+      },
+    } as TConfigDefaults;
+    const interfaceConfig = await loadDefaultInterface({ config, configDefaults });
+    const appConfig = { config, interfaceConfig } as unknown as AppConfig;
+
+    await updateInterfacePermissions({
+      appConfig,
+      getRoleByName: mockGetRoleByName,
+      updateAccessPermissions: mockUpdateAccessPermissions,
+    });
+
+    const userCall = mockUpdateAccessPermissions.mock.calls.find(
+      (call) => call[0] === SystemRoles.USER,
+    );
+
+    // CRITICAL: When using boolean config and permissions already exist,
+    // only USE should be updated. CREATE, SHARE, and SHARE_PUBLIC should NOT be in the update payload.
+    // This means they will be preserved in the database (not reset to defaults).
+    expect(userCall[1][PermissionTypes.AGENTS]).toEqual({
+      [Permissions.USE]: true,
+      // CREATE, SHARE, and SHARE_PUBLIC intentionally omitted - preserves existing DB values
+    });
+    expect(userCall[1][PermissionTypes.AGENTS]).not.toHaveProperty(Permissions.CREATE);
+    expect(userCall[1][PermissionTypes.AGENTS]).not.toHaveProperty(Permissions.SHARE);
+    expect(userCall[1][PermissionTypes.AGENTS]).not.toHaveProperty(Permissions.SHARE_PUBLIC);
+
+    expect(userCall[1][PermissionTypes.PROMPTS]).toEqual({
+      [Permissions.USE]: true,
+      // CREATE, SHARE, and SHARE_PUBLIC intentionally omitted - preserves existing DB values
+    });
+    expect(userCall[1][PermissionTypes.PROMPTS]).not.toHaveProperty(Permissions.CREATE);
+    expect(userCall[1][PermissionTypes.PROMPTS]).not.toHaveProperty(Permissions.SHARE);
+    expect(userCall[1][PermissionTypes.PROMPTS]).not.toHaveProperty(Permissions.SHARE_PUBLIC);
+  });
+
+  it('should include SHARE/SHARE_PUBLIC when using object config (explicit configuration)', async () => {
+    // When using object config like `agents: { share: true }`, SHARE/SHARE_PUBLIC SHOULD be updated
+    mockGetRoleByName.mockResolvedValue({
+      permissions: {
+        [PermissionTypes.AGENTS]: {
+          [Permissions.USE]: true,
+          [Permissions.CREATE]: true,
+          [Permissions.SHARE]: false,
+          [Permissions.SHARE_PUBLIC]: false,
+        },
+      },
+    });
+
+    const config = {
+      interface: {
+        agents: {
+          use: true,
+          share: true, // Explicitly setting SHARE
+          public: true, // Explicitly setting SHARE_PUBLIC
+        },
+      },
+    };
+    const configDefaults = {
+      interface: {
+        agents: {
+          use: true,
+          share: false,
+          public: false,
+        },
+      },
+    } as TConfigDefaults;
+    const interfaceConfig = await loadDefaultInterface({ config, configDefaults });
+    const appConfig = { config, interfaceConfig } as unknown as AppConfig;
+
+    await updateInterfacePermissions({
+      appConfig,
+      getRoleByName: mockGetRoleByName,
+      updateAccessPermissions: mockUpdateAccessPermissions,
+    });
+
+    const userCall = mockUpdateAccessPermissions.mock.calls.find(
+      (call) => call[0] === SystemRoles.USER,
+    );
+
+    // When object config is used with explicit share/public, they SHOULD be included
+    expect(userCall[1][PermissionTypes.AGENTS]).toHaveProperty(Permissions.SHARE, true);
+    expect(userCall[1][PermissionTypes.AGENTS]).toHaveProperty(Permissions.SHARE_PUBLIC, true);
+  });
+
+  it('should preserve SHARE/SHARE_PUBLIC when using object config without share/public keys', async () => {
+    // When using object config like `agents: { use: true, create: false }` WITHOUT share/public,
+    // existing SHARE and SHARE_PUBLIC should be preserved (not reset to defaults)
+    mockGetRoleByName.mockResolvedValue({
+      permissions: {
+        [PermissionTypes.AGENTS]: {
+          [Permissions.USE]: true,
+          [Permissions.CREATE]: true,
+          [Permissions.SHARE]: true, // User enabled this via admin panel
+          [Permissions.SHARE_PUBLIC]: true, // User enabled this via admin panel
+        },
+        [PermissionTypes.PROMPTS]: {
+          [Permissions.USE]: true,
+          [Permissions.CREATE]: true,
+          [Permissions.SHARE]: true,
+          [Permissions.SHARE_PUBLIC]: true,
+        },
+      },
+    });
+
+    const config = {
+      interface: {
+        agents: {
+          use: true,
+          create: false, // Only setting use and create, NOT share/public
+        },
+        prompts: {
+          use: true,
+          create: false, // Only setting use and create, NOT share/public
+        },
+      },
+    };
+    const configDefaults = {
+      interface: {
+        agents: {
+          use: true,
+          create: true,
+          share: false,
+          public: false,
+        },
+        prompts: {
+          use: true,
+          create: true,
+          share: false,
+          public: false,
+        },
+      },
+    } as TConfigDefaults;
+    const interfaceConfig = await loadDefaultInterface({ config, configDefaults });
+    const appConfig = { config, interfaceConfig } as unknown as AppConfig;
+
+    await updateInterfacePermissions({
+      appConfig,
+      getRoleByName: mockGetRoleByName,
+      updateAccessPermissions: mockUpdateAccessPermissions,
+    });
+
+    const userCall = mockUpdateAccessPermissions.mock.calls.find(
+      (call) => call[0] === SystemRoles.USER,
+    );
+
+    // AGENTS: use and create should be updated, but SHARE/SHARE_PUBLIC should NOT be in payload
+    expect(userCall[1][PermissionTypes.AGENTS]).toEqual({
+      [Permissions.USE]: true,
+      [Permissions.CREATE]: false,
+    });
+    expect(userCall[1][PermissionTypes.AGENTS]).not.toHaveProperty(Permissions.SHARE);
+    expect(userCall[1][PermissionTypes.AGENTS]).not.toHaveProperty(Permissions.SHARE_PUBLIC);
+
+    // PROMPTS: same behavior
+    expect(userCall[1][PermissionTypes.PROMPTS]).toEqual({
+      [Permissions.USE]: true,
+      [Permissions.CREATE]: false,
+    });
+    expect(userCall[1][PermissionTypes.PROMPTS]).not.toHaveProperty(Permissions.SHARE);
+    expect(userCall[1][PermissionTypes.PROMPTS]).not.toHaveProperty(Permissions.SHARE_PUBLIC);
+  });
 });
diff --git a/packages/api/src/app/permissions.ts b/packages/api/src/app/permissions.ts
index bfa49e6bbd..28d475e14e 100644
--- a/packages/api/src/app/permissions.ts
+++ b/packages/api/src/app/permissions.ts
@@ -43,6 +43,8 @@ function hasExplicitConfig(
       return interfaceConfig?.fileCitations !== undefined;
     case PermissionTypes.MCP_SERVERS:
       return interfaceConfig?.mcpServers !== undefined;
+    case PermissionTypes.REMOTE_AGENTS:
+      return interfaceConfig?.remoteAgents !== undefined;
     default:
       return false;
   }
@@ -101,7 +103,9 @@ export async function updateInterfacePermissions({
     const defaultPerms = roleDefaults[roleName]?.permissions;
 
     const existingRole = await getRoleByName(roleName);
-    const existingPermissions = existingRole?.permissions;
+    const existingPermissions = existingRole?.permissions as
+      | Partial<Record<PermissionTypes, Record<string, boolean | undefined>>>
+      | undefined;
     const permissionsToUpdate: Partial<
       Record<PermissionTypes, Record<string, boolean | undefined>>
     > = {};
@@ -142,21 +146,28 @@ export async function updateInterfacePermissions({
     };
 
     // Helper to extract value from boolean or object config
-    const getConfigUse = (
-      config: boolean | { use?: boolean; share?: boolean; public?: boolean } | undefined,
-    ) => (typeof config === 'boolean' ? config : config?.use);
-    const getConfigShare = (
-      config: boolean | { use?: boolean; share?: boolean; public?: boolean } | undefined,
-    ) => (typeof config === 'boolean' ? undefined : config?.share);
-    const getConfigPublic = (
-      config: boolean | { use?: boolean; share?: boolean; public?: boolean } | undefined,
-    ) => (typeof config === 'boolean' ? undefined : config?.public);
+    type PermissionConfig =
+      | boolean
+      | { use?: boolean; create?: boolean; share?: boolean; public?: boolean }
+      | undefined;
+    const getConfigUse = (config: PermissionConfig) =>
+      typeof config === 'boolean' ? config : config?.use;
+    const getConfigCreate = (config: PermissionConfig) =>
+      typeof config === 'boolean' ? undefined : config?.create;
+    const getConfigShare = (config: PermissionConfig) =>
+      typeof config === 'boolean' ? undefined : config?.share;
+    const getConfigPublic = (config: PermissionConfig) =>
+      typeof config === 'boolean' ? undefined : config?.public;
 
-    // Get default use values (for backward compat when config is boolean)
+    // Get default values (for backward compat when config is boolean)
     const promptsDefaultUse =
       typeof defaults.prompts === 'boolean' ? defaults.prompts : defaults.prompts?.use;
     const agentsDefaultUse =
       typeof defaults.agents === 'boolean' ? defaults.agents : defaults.agents?.use;
+    const promptsDefaultCreate =
+      typeof defaults.prompts === 'object' ? defaults.prompts?.create : undefined;
+    const agentsDefaultCreate =
+      typeof defaults.agents === 'object' ? defaults.agents?.create : undefined;
     const promptsDefaultShare =
       typeof defaults.prompts === 'object' ? defaults.prompts?.share : undefined;
     const agentsDefaultShare =
@@ -173,21 +184,32 @@ export async function updateInterfacePermissions({
           defaultPerms[PermissionTypes.PROMPTS]?.[Permissions.USE],
           promptsDefaultUse,
         ),
-        [Permissions.CREATE]: getPermissionValue(
-          undefined,
-          defaultPerms[PermissionTypes.PROMPTS]?.[Permissions.CREATE],
-          true,
-        ),
-        [Permissions.SHARE]: getPermissionValue(
-          getConfigShare(loadedInterface.prompts),
-          defaultPerms[PermissionTypes.PROMPTS]?.[Permissions.SHARE],
-          promptsDefaultShare,
-        ),
-        [Permissions.SHARE_PUBLIC]: getPermissionValue(
-          getConfigPublic(loadedInterface.prompts),
-          defaultPerms[PermissionTypes.PROMPTS]?.[Permissions.SHARE_PUBLIC],
-          promptsDefaultPublic,
-        ),
+        ...((typeof interfaceConfig?.prompts === 'object' && 'create' in interfaceConfig.prompts) ||
+        !existingPermissions?.[PermissionTypes.PROMPTS]
+          ? {
+              [Permissions.CREATE]: getPermissionValue(
+                getConfigCreate(loadedInterface.prompts),
+                defaultPerms[PermissionTypes.PROMPTS]?.[Permissions.CREATE],
+                promptsDefaultCreate ?? true,
+              ),
+            }
+          : {}),
+        ...((typeof interfaceConfig?.prompts === 'object' &&
+          ('share' in interfaceConfig.prompts || 'public' in interfaceConfig.prompts)) ||
+        !existingPermissions?.[PermissionTypes.PROMPTS]
+          ? {
+              [Permissions.SHARE]: getPermissionValue(
+                getConfigShare(loadedInterface.prompts),
+                defaultPerms[PermissionTypes.PROMPTS]?.[Permissions.SHARE],
+                promptsDefaultShare,
+              ),
+              [Permissions.SHARE_PUBLIC]: getPermissionValue(
+                getConfigPublic(loadedInterface.prompts),
+                defaultPerms[PermissionTypes.PROMPTS]?.[Permissions.SHARE_PUBLIC],
+                promptsDefaultPublic,
+              ),
+            }
+          : {}),
       },
       [PermissionTypes.BOOKMARKS]: {
         [Permissions.USE]: getPermissionValue(
@@ -238,21 +260,32 @@ export async function updateInterfacePermissions({
           defaultPerms[PermissionTypes.AGENTS]?.[Permissions.USE],
           agentsDefaultUse,
         ),
-        [Permissions.CREATE]: getPermissionValue(
-          undefined,
-          defaultPerms[PermissionTypes.AGENTS]?.[Permissions.CREATE],
-          true,
-        ),
-        [Permissions.SHARE]: getPermissionValue(
-          getConfigShare(loadedInterface.agents),
-          defaultPerms[PermissionTypes.AGENTS]?.[Permissions.SHARE],
-          agentsDefaultShare,
-        ),
-        [Permissions.SHARE_PUBLIC]: getPermissionValue(
-          getConfigPublic(loadedInterface.agents),
-          defaultPerms[PermissionTypes.AGENTS]?.[Permissions.SHARE_PUBLIC],
-          agentsDefaultPublic,
-        ),
+        ...((typeof interfaceConfig?.agents === 'object' && 'create' in interfaceConfig.agents) ||
+        !existingPermissions?.[PermissionTypes.AGENTS]
+          ? {
+              [Permissions.CREATE]: getPermissionValue(
+                getConfigCreate(loadedInterface.agents),
+                defaultPerms[PermissionTypes.AGENTS]?.[Permissions.CREATE],
+                agentsDefaultCreate ?? true,
+              ),
+            }
+          : {}),
+        ...((typeof interfaceConfig?.agents === 'object' &&
+          ('share' in interfaceConfig.agents || 'public' in interfaceConfig.agents)) ||
+        !existingPermissions?.[PermissionTypes.AGENTS]
+          ? {
+              [Permissions.SHARE]: getPermissionValue(
+                getConfigShare(loadedInterface.agents),
+                defaultPerms[PermissionTypes.AGENTS]?.[Permissions.SHARE],
+                agentsDefaultShare,
+              ),
+              [Permissions.SHARE_PUBLIC]: getPermissionValue(
+                getConfigPublic(loadedInterface.agents),
+                defaultPerms[PermissionTypes.AGENTS]?.[Permissions.SHARE_PUBLIC],
+                agentsDefaultPublic,
+              ),
+            }
+          : {}),
       },
       [PermissionTypes.TEMPORARY_CHAT]: {
         [Permissions.USE]: getPermissionValue(
@@ -324,16 +357,50 @@ export async function updateInterfacePermissions({
           defaultPerms[PermissionTypes.MCP_SERVERS]?.[Permissions.CREATE],
           defaults.mcpServers?.create,
         ),
-        [Permissions.SHARE]: getPermissionValue(
-          loadedInterface.mcpServers?.share,
-          defaultPerms[PermissionTypes.MCP_SERVERS]?.[Permissions.SHARE],
-          defaults.mcpServers?.share,
+        ...((typeof interfaceConfig?.mcpServers === 'object' &&
+          ('share' in interfaceConfig.mcpServers || 'public' in interfaceConfig.mcpServers)) ||
+        !existingPermissions?.[PermissionTypes.MCP_SERVERS]
+          ? {
+              [Permissions.SHARE]: getPermissionValue(
+                loadedInterface.mcpServers?.share,
+                defaultPerms[PermissionTypes.MCP_SERVERS]?.[Permissions.SHARE],
+                defaults.mcpServers?.share,
+              ),
+              [Permissions.SHARE_PUBLIC]: getPermissionValue(
+                loadedInterface.mcpServers?.public,
+                defaultPerms[PermissionTypes.MCP_SERVERS]?.[Permissions.SHARE_PUBLIC],
+                defaults.mcpServers?.public,
+              ),
+            }
+          : {}),
+      },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: getPermissionValue(
+          loadedInterface.remoteAgents?.use,
+          defaultPerms[PermissionTypes.REMOTE_AGENTS]?.[Permissions.USE],
+          defaults.remoteAgents?.use,
         ),
-        [Permissions.SHARE_PUBLIC]: getPermissionValue(
-          loadedInterface.mcpServers?.public,
-          defaultPerms[PermissionTypes.MCP_SERVERS]?.[Permissions.SHARE_PUBLIC],
-          defaults.mcpServers?.public,
+        [Permissions.CREATE]: getPermissionValue(
+          loadedInterface.remoteAgents?.create,
+          defaultPerms[PermissionTypes.REMOTE_AGENTS]?.[Permissions.CREATE],
+          defaults.remoteAgents?.create,
         ),
+        ...((typeof interfaceConfig?.remoteAgents === 'object' &&
+          ('share' in interfaceConfig.remoteAgents || 'public' in interfaceConfig.remoteAgents)) ||
+        !existingPermissions?.[PermissionTypes.REMOTE_AGENTS]
+          ? {
+              [Permissions.SHARE]: getPermissionValue(
+                loadedInterface.remoteAgents?.share,
+                defaultPerms[PermissionTypes.REMOTE_AGENTS]?.[Permissions.SHARE],
+                defaults.remoteAgents?.share,
+              ),
+              [Permissions.SHARE_PUBLIC]: getPermissionValue(
+                loadedInterface.remoteAgents?.public,
+                defaultPerms[PermissionTypes.REMOTE_AGENTS]?.[Permissions.SHARE_PUBLIC],
+                defaults.remoteAgents?.public,
+              ),
+            }
+          : {}),
       },
     };
 
diff --git a/packages/api/src/auth/agent.spec.ts b/packages/api/src/auth/agent.spec.ts
new file mode 100644
index 0000000000..9ab2a9aaf9
--- /dev/null
+++ b/packages/api/src/auth/agent.spec.ts
@@ -0,0 +1,113 @@
+jest.mock('node:dns', () => {
+  const actual = jest.requireActual('node:dns');
+  return {
+    ...actual,
+    lookup: jest.fn(),
+  };
+});
+
+import dns from 'node:dns';
+import { createSSRFSafeAgents, createSSRFSafeUndiciConnect } from './agent';
+
+type LookupCallback = (err: NodeJS.ErrnoException | null, address: string, family: number) => void;
+
+const mockedDnsLookup = dns.lookup as jest.MockedFunction<typeof dns.lookup>;
+
+function mockDnsResult(address: string, family: number): void {
+  mockedDnsLookup.mockImplementation(((
+    _hostname: string,
+    _options: unknown,
+    callback: LookupCallback,
+  ) => {
+    callback(null, address, family);
+  }) as never);
+}
+
+function mockDnsError(err: NodeJS.ErrnoException): void {
+  mockedDnsLookup.mockImplementation(((
+    _hostname: string,
+    _options: unknown,
+    callback: LookupCallback,
+  ) => {
+    callback(err, '', 0);
+  }) as never);
+}
+
+describe('createSSRFSafeAgents', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should return httpAgent and httpsAgent', () => {
+    const agents = createSSRFSafeAgents();
+    expect(agents.httpAgent).toBeDefined();
+    expect(agents.httpsAgent).toBeDefined();
+  });
+
+  it('should patch httpAgent createConnection to inject SSRF lookup', () => {
+    const agents = createSSRFSafeAgents();
+    const internal = agents.httpAgent as unknown as {
+      createConnection: (opts: Record<string, unknown>) => unknown;
+    };
+    expect(internal.createConnection).toBeInstanceOf(Function);
+  });
+});
+
+describe('createSSRFSafeUndiciConnect', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should return an object with a lookup function', () => {
+    const connect = createSSRFSafeUndiciConnect();
+    expect(connect).toHaveProperty('lookup');
+    expect(connect.lookup).toBeInstanceOf(Function);
+  });
+
+  it('lookup should block private IPs', async () => {
+    mockDnsResult('10.0.0.1', 4);
+    const connect = createSSRFSafeUndiciConnect();
+
+    const result = await new Promise<{ err: NodeJS.ErrnoException | null }>((resolve) => {
+      connect.lookup('evil.example.com', {}, (err) => {
+        resolve({ err });
+      });
+    });
+
+    expect(result.err).toBeTruthy();
+    expect(result.err!.code).toBe('ESSRF');
+  });
+
+  it('lookup should allow public IPs', async () => {
+    mockDnsResult('93.184.216.34', 4);
+    const connect = createSSRFSafeUndiciConnect();
+
+    const result = await new Promise<{ err: NodeJS.ErrnoException | null; address: string }>(
+      (resolve) => {
+        connect.lookup('example.com', {}, (err, address) => {
+          resolve({ err, address: address as string });
+        });
+      },
+    );
+
+    expect(result.err).toBeNull();
+    expect(result.address).toBe('93.184.216.34');
+  });
+
+  it('lookup should forward DNS errors', async () => {
+    const dnsError = Object.assign(new Error('ENOTFOUND'), {
+      code: 'ENOTFOUND',
+    }) as NodeJS.ErrnoException;
+    mockDnsError(dnsError);
+    const connect = createSSRFSafeUndiciConnect();
+
+    const result = await new Promise<{ err: NodeJS.ErrnoException | null }>((resolve) => {
+      connect.lookup('nonexistent.example.com', {}, (err) => {
+        resolve({ err });
+      });
+    });
+
+    expect(result.err).toBeTruthy();
+    expect(result.err!.code).toBe('ENOTFOUND');
+  });
+});
diff --git a/packages/api/src/auth/agent.ts b/packages/api/src/auth/agent.ts
new file mode 100644
index 0000000000..2442aa20fa
--- /dev/null
+++ b/packages/api/src/auth/agent.ts
@@ -0,0 +1,61 @@
+import dns from 'node:dns';
+import http from 'node:http';
+import https from 'node:https';
+import type { LookupFunction } from 'node:net';
+import { isPrivateIP } from './domain';
+
+/** DNS lookup wrapper that blocks resolution to private/reserved IP addresses */
+const ssrfSafeLookup: LookupFunction = (hostname, options, callback) => {
+  dns.lookup(hostname, options, (err, address, family) => {
+    if (err) {
+      callback(err, '', 0);
+      return;
+    }
+    if (typeof address === 'string' && isPrivateIP(address)) {
+      const ssrfError = Object.assign(
+        new Error(`SSRF protection: ${hostname} resolved to blocked address ${address}`),
+        { code: 'ESSRF' },
+      ) as NodeJS.ErrnoException;
+      callback(ssrfError, address, family as number);
+      return;
+    }
+    callback(null, address as string, family as number);
+  });
+};
+
+/** Internal agent shape exposing createConnection (exists at runtime but not in TS types) */
+type AgentInternal = {
+  createConnection: (options: Record<string, unknown>, oncreate?: unknown) => unknown;
+};
+
+/** Patches an agent instance to inject SSRF-safe DNS lookup at connect time */
+function withSSRFProtection<T extends http.Agent>(agent: T): T {
+  const internal = agent as unknown as AgentInternal;
+  const origCreate = internal.createConnection.bind(agent);
+  internal.createConnection = (options: Record<string, unknown>, oncreate?: unknown) => {
+    options.lookup = ssrfSafeLookup;
+    return origCreate(options, oncreate);
+  };
+  return agent;
+}
+
+/**
+ * Creates HTTP and HTTPS agents that block TCP connections to private/reserved IP addresses.
+ * Provides TOCTOU-safe SSRF protection by validating the resolved IP at connect time,
+ * preventing DNS rebinding attacks where a hostname resolves to a public IP during
+ * pre-validation but to a private IP when the actual connection is made.
+ */
+export function createSSRFSafeAgents(): { httpAgent: http.Agent; httpsAgent: https.Agent } {
+  return {
+    httpAgent: withSSRFProtection(new http.Agent()),
+    httpsAgent: withSSRFProtection(new https.Agent()),
+  };
+}
+
+/**
+ * Returns undici-compatible `connect` options with SSRF-safe DNS lookup.
+ * Pass the result as the `connect` property when constructing an undici `Agent`.
+ */
+export function createSSRFSafeUndiciConnect(): { lookup: LookupFunction } {
+  return { lookup: ssrfSafeLookup };
+}
diff --git a/packages/api/src/auth/domain.spec.ts b/packages/api/src/auth/domain.spec.ts
index a2b4c42cd7..5f6187c9b4 100644
--- a/packages/api/src/auth/domain.spec.ts
+++ b/packages/api/src/auth/domain.spec.ts
@@ -1,12 +1,21 @@
 /* eslint-disable @typescript-eslint/ban-ts-comment */
+jest.mock('node:dns/promises', () => ({
+  lookup: jest.fn(),
+}));
+
+import { lookup } from 'node:dns/promises';
 import {
   extractMCPServerDomain,
   isActionDomainAllowed,
   isEmailDomainAllowed,
   isMCPDomainAllowed,
+  isPrivateIP,
   isSSRFTarget,
+  resolveHostnameSSRF,
 } from './domain';
 
+const mockedLookup = lookup as jest.MockedFunction<typeof lookup>;
+
 describe('isEmailDomainAllowed', () => {
   afterEach(() => {
     jest.clearAllMocks();
@@ -192,7 +201,154 @@ describe('isSSRFTarget', () => {
   });
 });
 
+describe('isPrivateIP', () => {
+  describe('IPv4 private ranges', () => {
+    it('should detect loopback addresses', () => {
+      expect(isPrivateIP('127.0.0.1')).toBe(true);
+      expect(isPrivateIP('127.255.255.255')).toBe(true);
+    });
+
+    it('should detect 10.x.x.x private range', () => {
+      expect(isPrivateIP('10.0.0.1')).toBe(true);
+      expect(isPrivateIP('10.255.255.255')).toBe(true);
+    });
+
+    it('should detect 172.16-31.x.x private range', () => {
+      expect(isPrivateIP('172.16.0.1')).toBe(true);
+      expect(isPrivateIP('172.31.255.255')).toBe(true);
+      expect(isPrivateIP('172.15.0.1')).toBe(false);
+      expect(isPrivateIP('172.32.0.1')).toBe(false);
+    });
+
+    it('should detect 192.168.x.x private range', () => {
+      expect(isPrivateIP('192.168.0.1')).toBe(true);
+      expect(isPrivateIP('192.168.255.255')).toBe(true);
+    });
+
+    it('should detect 169.254.x.x link-local range', () => {
+      expect(isPrivateIP('169.254.169.254')).toBe(true);
+      expect(isPrivateIP('169.254.0.1')).toBe(true);
+    });
+
+    it('should detect 0.0.0.0', () => {
+      expect(isPrivateIP('0.0.0.0')).toBe(true);
+    });
+
+    it('should allow public IPs', () => {
+      expect(isPrivateIP('8.8.8.8')).toBe(false);
+      expect(isPrivateIP('1.1.1.1')).toBe(false);
+      expect(isPrivateIP('93.184.216.34')).toBe(false);
+    });
+  });
+
+  describe('IPv6 private ranges', () => {
+    it('should detect loopback', () => {
+      expect(isPrivateIP('::1')).toBe(true);
+      expect(isPrivateIP('::')).toBe(true);
+      expect(isPrivateIP('[::1]')).toBe(true);
+    });
+
+    it('should detect unique local (fc/fd) and link-local (fe80)', () => {
+      expect(isPrivateIP('fc00::1')).toBe(true);
+      expect(isPrivateIP('fd00::1')).toBe(true);
+      expect(isPrivateIP('fe80::1')).toBe(true);
+    });
+  });
+
+  describe('IPv4-mapped IPv6 addresses', () => {
+    it('should detect private IPs in IPv4-mapped IPv6 form', () => {
+      expect(isPrivateIP('::ffff:169.254.169.254')).toBe(true);
+      expect(isPrivateIP('::ffff:127.0.0.1')).toBe(true);
+      expect(isPrivateIP('::ffff:10.0.0.1')).toBe(true);
+      expect(isPrivateIP('::ffff:192.168.1.1')).toBe(true);
+    });
+
+    it('should allow public IPs in IPv4-mapped IPv6 form', () => {
+      expect(isPrivateIP('::ffff:8.8.8.8')).toBe(false);
+      expect(isPrivateIP('::ffff:93.184.216.34')).toBe(false);
+    });
+  });
+});
+
+describe('resolveHostnameSSRF', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should detect domains that resolve to private IPs (nip.io bypass)', async () => {
+    mockedLookup.mockResolvedValueOnce([{ address: '169.254.169.254', family: 4 }] as never);
+    expect(await resolveHostnameSSRF('169.254.169.254.nip.io')).toBe(true);
+  });
+
+  it('should detect domains that resolve to loopback', async () => {
+    mockedLookup.mockResolvedValueOnce([{ address: '127.0.0.1', family: 4 }] as never);
+    expect(await resolveHostnameSSRF('loopback.example.com')).toBe(true);
+  });
+
+  it('should detect when any resolved address is private', async () => {
+    mockedLookup.mockResolvedValueOnce([
+      { address: '93.184.216.34', family: 4 },
+      { address: '10.0.0.1', family: 4 },
+    ] as never);
+    expect(await resolveHostnameSSRF('dual.example.com')).toBe(true);
+  });
+
+  it('should allow domains that resolve to public IPs', async () => {
+    mockedLookup.mockResolvedValueOnce([{ address: '93.184.216.34', family: 4 }] as never);
+    expect(await resolveHostnameSSRF('example.com')).toBe(false);
+  });
+
+  it('should skip literal IPv4 addresses (handled by isSSRFTarget)', async () => {
+    expect(await resolveHostnameSSRF('169.254.169.254')).toBe(false);
+    expect(mockedLookup).not.toHaveBeenCalled();
+  });
+
+  it('should skip literal IPv6 addresses', async () => {
+    expect(await resolveHostnameSSRF('::1')).toBe(false);
+    expect(mockedLookup).not.toHaveBeenCalled();
+  });
+
+  it('should fail open on DNS resolution failure', async () => {
+    mockedLookup.mockRejectedValueOnce(new Error('ENOTFOUND'));
+    expect(await resolveHostnameSSRF('nonexistent.example.com')).toBe(false);
+  });
+});
+
+describe('isActionDomainAllowed - DNS resolution SSRF protection', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should block domains resolving to cloud metadata IP (169.254.169.254)', async () => {
+    mockedLookup.mockResolvedValueOnce([{ address: '169.254.169.254', family: 4 }] as never);
+    expect(await isActionDomainAllowed('169.254.169.254.nip.io', null)).toBe(false);
+  });
+
+  it('should block domains resolving to private 10.x range', async () => {
+    mockedLookup.mockResolvedValueOnce([{ address: '10.0.0.5', family: 4 }] as never);
+    expect(await isActionDomainAllowed('internal.attacker.com', null)).toBe(false);
+  });
+
+  it('should block domains resolving to 172.16.x range', async () => {
+    mockedLookup.mockResolvedValueOnce([{ address: '172.16.0.1', family: 4 }] as never);
+    expect(await isActionDomainAllowed('docker.attacker.com', null)).toBe(false);
+  });
+
+  it('should allow domains resolving to public IPs when no allowlist', async () => {
+    mockedLookup.mockResolvedValueOnce([{ address: '93.184.216.34', family: 4 }] as never);
+    expect(await isActionDomainAllowed('example.com', null)).toBe(true);
+  });
+
+  it('should not perform DNS check when allowedDomains is configured', async () => {
+    expect(await isActionDomainAllowed('example.com', ['example.com'])).toBe(true);
+    expect(mockedLookup).not.toHaveBeenCalled();
+  });
+});
+
 describe('isActionDomainAllowed', () => {
+  beforeEach(() => {
+    mockedLookup.mockResolvedValue([{ address: '93.184.216.34', family: 4 }] as never);
+  });
   afterEach(() => {
     jest.clearAllMocks();
   });
@@ -541,6 +697,9 @@ describe('extractMCPServerDomain', () => {
 });
 
 describe('isMCPDomainAllowed', () => {
+  beforeEach(() => {
+    mockedLookup.mockResolvedValue([{ address: '93.184.216.34', family: 4 }] as never);
+  });
   afterEach(() => {
     jest.clearAllMocks();
   });
diff --git a/packages/api/src/auth/domain.ts b/packages/api/src/auth/domain.ts
index 5d9fc51d02..f2e86875d4 100644
--- a/packages/api/src/auth/domain.ts
+++ b/packages/api/src/auth/domain.ts
@@ -1,3 +1,5 @@
+import { lookup } from 'node:dns/promises';
+
 /**
  * @param email
  * @param allowedDomains
@@ -22,6 +24,88 @@ export function isEmailDomainAllowed(email: string, allowedDomains?: string[] |
   return allowedDomains.some((allowedDomain) => allowedDomain?.toLowerCase() === domain);
 }
 
+/** Checks if IPv4 octets fall within private, reserved, or link-local ranges */
+function isPrivateIPv4(a: number, b: number, c: number): boolean {
+  if (a === 127) {
+    return true;
+  }
+  if (a === 10) {
+    return true;
+  }
+  if (a === 172 && b >= 16 && b <= 31) {
+    return true;
+  }
+  if (a === 192 && b === 168) {
+    return true;
+  }
+  if (a === 169 && b === 254) {
+    return true;
+  }
+  if (a === 0 && b === 0 && c === 0) {
+    return true;
+  }
+  return false;
+}
+
+/**
+ * Checks if an IP address belongs to a private, reserved, or link-local range.
+ * Handles IPv4, IPv6, and IPv4-mapped IPv6 addresses (::ffff:A.B.C.D).
+ */
+export function isPrivateIP(ip: string): boolean {
+  const normalized = ip.toLowerCase().trim();
+
+  const mappedMatch = normalized.match(/^::ffff:(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/);
+  if (mappedMatch) {
+    const [, a, b, c] = mappedMatch.map(Number);
+    return isPrivateIPv4(a, b, c);
+  }
+
+  const ipv4Match = normalized.match(/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/);
+  if (ipv4Match) {
+    const [, a, b, c] = ipv4Match.map(Number);
+    return isPrivateIPv4(a, b, c);
+  }
+
+  const ipv6 = normalized.replace(/^\[|\]$/g, '');
+  if (
+    ipv6 === '::1' ||
+    ipv6 === '::' ||
+    ipv6.startsWith('fc') ||
+    ipv6.startsWith('fd') ||
+    ipv6.startsWith('fe80')
+  ) {
+    return true;
+  }
+
+  return false;
+}
+
+/**
+ * Resolves a hostname via DNS and checks if any resolved address is a private/reserved IP.
+ * Detects DNS-based SSRF bypasses (e.g., nip.io wildcard DNS, attacker-controlled nameservers).
+ * Fails open: returns false if DNS resolution fails, since hostname-only checks still apply
+ * and the actual HTTP request would also fail.
+ */
+export async function resolveHostnameSSRF(hostname: string): Promise<boolean> {
+  const normalizedHost = hostname.toLowerCase().trim();
+
+  if (/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/.test(normalizedHost)) {
+    return false;
+  }
+
+  const ipv6Check = normalizedHost.replace(/^\[|\]$/g, '');
+  if (ipv6Check.includes(':')) {
+    return false;
+  }
+
+  try {
+    const addresses = await lookup(hostname, { all: true });
+    return addresses.some((entry) => isPrivateIP(entry.address));
+  } catch {
+    return false;
+  }
+}
+
 /**
  * SSRF Protection: Checks if a hostname/IP is a potentially dangerous internal target.
  * Blocks private IPs, localhost, cloud metadata IPs, and common internal hostnames.
@@ -31,7 +115,6 @@ export function isEmailDomainAllowed(email: string, allowedDomains?: string[] |
 export function isSSRFTarget(hostname: string): boolean {
   const normalizedHost = hostname.toLowerCase().trim();
 
-  // Block localhost variations
   if (
     normalizedHost === 'localhost' ||
     normalizedHost === 'localhost.localdomain' ||
@@ -40,51 +123,7 @@ export function isSSRFTarget(hostname: string): boolean {
     return true;
   }
 
-  // Check if it's an IP address and block private/internal ranges
-  const ipv4Match = normalizedHost.match(/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/);
-  if (ipv4Match) {
-    const [, a, b, c] = ipv4Match.map(Number);
-
-    // 127.0.0.0/8 - Loopback
-    if (a === 127) {
-      return true;
-    }
-
-    // 10.0.0.0/8 - Private
-    if (a === 10) {
-      return true;
-    }
-
-    // 172.16.0.0/12 - Private (172.16.x.x - 172.31.x.x)
-    if (a === 172 && b >= 16 && b <= 31) {
-      return true;
-    }
-
-    // 192.168.0.0/16 - Private
-    if (a === 192 && b === 168) {
-      return true;
-    }
-
-    // 169.254.0.0/16 - Link-local (includes cloud metadata 169.254.169.254)
-    if (a === 169 && b === 254) {
-      return true;
-    }
-
-    // 0.0.0.0 - Special
-    if (a === 0 && b === 0 && c === 0) {
-      return true;
-    }
-  }
-
-  // IPv6 loopback and private ranges
-  const ipv6Normalized = normalizedHost.replace(/^\[|\]$/g, ''); // Remove brackets if present
-  if (
-    ipv6Normalized === '::1' ||
-    ipv6Normalized === '::' ||
-    ipv6Normalized.startsWith('fc') || // fc00::/7 - Unique local
-    ipv6Normalized.startsWith('fd') || // fd00::/8 - Unique local
-    ipv6Normalized.startsWith('fe80') // fe80::/10 - Link-local
-  ) {
+  if (isPrivateIP(normalizedHost)) {
     return true;
   }
 
@@ -257,6 +296,10 @@ async function isDomainAllowedCore(
     if (isSSRFTarget(inputSpec.hostname)) {
       return false;
     }
+    /** SECURITY: Resolve hostname and block if it points to a private/reserved IP */
+    if (await resolveHostnameSSRF(inputSpec.hostname)) {
+      return false;
+    }
     return true;
   }
 
diff --git a/packages/api/src/auth/exchange.ts b/packages/api/src/auth/exchange.ts
new file mode 100644
index 0000000000..c919974523
--- /dev/null
+++ b/packages/api/src/auth/exchange.ts
@@ -0,0 +1,157 @@
+import crypto from 'crypto';
+import { Keyv } from 'keyv';
+import { logger } from '@librechat/data-schemas';
+import type { IUser } from '@librechat/data-schemas';
+
+/** Default admin panel URL for local development */
+const DEFAULT_ADMIN_PANEL_URL = 'http://localhost:3000';
+
+/**
+ * Gets the admin panel URL from environment or falls back to default.
+ * @returns The admin panel URL
+ */
+export function getAdminPanelUrl(): string {
+  return process.env.ADMIN_PANEL_URL || DEFAULT_ADMIN_PANEL_URL;
+}
+
+/**
+ * User data stored in the exchange cache
+ */
+export interface AdminExchangeUser {
+  _id: string;
+  id: string;
+  email: string;
+  name: string;
+  username: string;
+  role: string;
+  avatar?: string;
+  provider?: string;
+  openidId?: string;
+}
+
+/**
+ * Data stored in cache for admin OAuth exchange
+ */
+export interface AdminExchangeData {
+  userId: string;
+  user: AdminExchangeUser;
+  token: string;
+  refreshToken?: string;
+}
+
+/**
+ * Response from the exchange endpoint
+ */
+export interface AdminExchangeResponse {
+  token: string;
+  refreshToken?: string;
+  user: AdminExchangeUser;
+}
+
+/**
+ * Serializes user data for the exchange cache.
+ * @param user - The authenticated user object
+ * @returns Serialized user data for admin panel
+ */
+export function serializeUserForExchange(user: IUser): AdminExchangeUser {
+  const userId = String(user._id);
+  return {
+    _id: userId,
+    id: userId,
+    email: user.email,
+    name: user.name ?? '',
+    username: user.username ?? '',
+    role: user.role ?? 'USER',
+    avatar: user.avatar,
+    provider: user.provider,
+    openidId: user.openidId,
+  };
+}
+
+/**
+ * Generates an exchange code and stores user data for admin panel OAuth flow.
+ * @param cache - The Keyv cache instance for storing exchange data
+ * @param user - The authenticated user object
+ * @param token - The JWT access token
+ * @param refreshToken - Optional refresh token for OpenID users
+ * @returns The generated exchange code
+ */
+export async function generateAdminExchangeCode(
+  cache: Keyv,
+  user: IUser,
+  token: string,
+  refreshToken?: string,
+): Promise<string> {
+  const exchangeCode = crypto.randomBytes(32).toString('hex');
+
+  const data: AdminExchangeData = {
+    userId: String(user._id),
+    user: serializeUserForExchange(user),
+    token,
+    refreshToken,
+  };
+
+  await cache.set(exchangeCode, data);
+
+  logger.info(`[adminExchange] Generated exchange code for user: ${user.email}`);
+
+  return exchangeCode;
+}
+
+/**
+ * Exchanges an authorization code for tokens and user data.
+ * The code is deleted immediately after retrieval (one-time use).
+ * @param cache - The Keyv cache instance for retrieving exchange data
+ * @param code - The authorization code to exchange
+ * @returns The exchange response with token, refreshToken, and user data, or null if invalid/expired
+ */
+export async function exchangeAdminCode(
+  cache: Keyv,
+  code: string,
+): Promise<AdminExchangeResponse | null> {
+  const data = (await cache.get(code)) as AdminExchangeData | undefined;
+
+  /** Delete immediately - one-time use */
+  await cache.delete(code);
+
+  if (!data) {
+    logger.warn('[adminExchange] Invalid or expired authorization code');
+    return null;
+  }
+
+  logger.info(`[adminExchange] Exchanged code for user: ${data.user?.email}`);
+
+  return {
+    token: data.token,
+    refreshToken: data.refreshToken,
+    user: data.user,
+  };
+}
+
+/**
+ * Checks if the redirect URI is for the admin panel (cross-origin).
+ * Uses proper URL parsing to compare origins, handling edge cases where
+ * both URLs might share the same prefix (e.g., localhost:3000 vs localhost:3001).
+ *
+ * @param redirectUri - The redirect URI to check.
+ * @param adminPanelUrl - The admin panel URL (defaults to ADMIN_PANEL_URL env var)
+ * @param domainClient - The main client domain
+ * @returns True if redirecting to admin panel (different origin from main client).
+ */
+export function isAdminPanelRedirect(
+  redirectUri: string,
+  adminPanelUrl: string,
+  domainClient: string,
+): boolean {
+  try {
+    const redirectOrigin = new URL(redirectUri).origin;
+    const adminOrigin = new URL(adminPanelUrl).origin;
+    const clientOrigin = new URL(domainClient).origin;
+
+    /** Redirect is for admin panel if it matches admin origin but not main client origin */
+    return redirectOrigin === adminOrigin && redirectOrigin !== clientOrigin;
+  } catch {
+    /** If URL parsing fails, fall back to simple string comparison */
+    return redirectUri.startsWith(adminPanelUrl) && !redirectUri.startsWith(domainClient);
+  }
+}
diff --git a/packages/api/src/auth/index.ts b/packages/api/src/auth/index.ts
index bee8cf1691..392605ef50 100644
--- a/packages/api/src/auth/index.ts
+++ b/packages/api/src/auth/index.ts
@@ -1,2 +1,4 @@
 export * from './domain';
 export * from './openid';
+export * from './exchange';
+export * from './agent';
diff --git a/packages/api/src/cache/__tests__/cacheConfig.spec.ts b/packages/api/src/cache/__tests__/cacheConfig.spec.ts
index e24f52fee0..0488cfecfc 100644
--- a/packages/api/src/cache/__tests__/cacheConfig.spec.ts
+++ b/packages/api/src/cache/__tests__/cacheConfig.spec.ts
@@ -215,16 +215,30 @@ describe('cacheConfig', () => {
       }).rejects.toThrow('Invalid cache keys in FORCED_IN_MEMORY_CACHE_NAMESPACES: INVALID_KEY');
     });
 
-    test('should handle empty string gracefully', async () => {
+    test('should produce empty array when set to empty string (opt out of defaults)', async () => {
       process.env.FORCED_IN_MEMORY_CACHE_NAMESPACES = '';
 
       const { cacheConfig } = await import('../cacheConfig');
       expect(cacheConfig.FORCED_IN_MEMORY_CACHE_NAMESPACES).toEqual([]);
     });
 
-    test('should handle undefined env var gracefully', async () => {
+    test('should default to CONFIG_STORE and APP_CONFIG when env var is not set', async () => {
       const { cacheConfig } = await import('../cacheConfig');
-      expect(cacheConfig.FORCED_IN_MEMORY_CACHE_NAMESPACES).toEqual([]);
+      expect(cacheConfig.FORCED_IN_MEMORY_CACHE_NAMESPACES).toEqual(['CONFIG_STORE', 'APP_CONFIG']);
+    });
+
+    test('should accept TOOL_CACHE as a valid namespace', async () => {
+      process.env.FORCED_IN_MEMORY_CACHE_NAMESPACES = 'TOOL_CACHE';
+
+      const { cacheConfig } = await import('../cacheConfig');
+      expect(cacheConfig.FORCED_IN_MEMORY_CACHE_NAMESPACES).toEqual(['TOOL_CACHE']);
+    });
+
+    test('should accept CONFIG_STORE and APP_CONFIG together for blue/green deployments', async () => {
+      process.env.FORCED_IN_MEMORY_CACHE_NAMESPACES = 'CONFIG_STORE,APP_CONFIG';
+
+      const { cacheConfig } = await import('../cacheConfig');
+      expect(cacheConfig.FORCED_IN_MEMORY_CACHE_NAMESPACES).toEqual(['CONFIG_STORE', 'APP_CONFIG']);
     });
   });
 });
diff --git a/packages/api/src/cache/__tests__/cacheFactory/standardCache.namespace_isolation.spec.ts b/packages/api/src/cache/__tests__/cacheFactory/standardCache.namespace_isolation.spec.ts
new file mode 100644
index 0000000000..9a8b4ff3bf
--- /dev/null
+++ b/packages/api/src/cache/__tests__/cacheFactory/standardCache.namespace_isolation.spec.ts
@@ -0,0 +1,135 @@
+import { CacheKeys } from 'librechat-data-provider';
+
+const mockKeyvRedisInstance = {
+  namespace: '',
+  keyPrefixSeparator: '',
+  on: jest.fn(),
+};
+
+const MockKeyvRedis = jest.fn().mockReturnValue(mockKeyvRedisInstance);
+
+jest.mock('@keyv/redis', () => ({
+  default: MockKeyvRedis,
+}));
+
+const mockKeyvRedisClient = { scanIterator: jest.fn() };
+
+jest.mock('../../redisClients', () => ({
+  keyvRedisClient: mockKeyvRedisClient,
+  ioredisClient: null,
+}));
+
+jest.mock('../../redisUtils', () => ({
+  batchDeleteKeys: jest.fn(),
+  scanKeys: jest.fn(),
+}));
+
+jest.mock('@librechat/data-schemas', () => ({
+  logger: {
+    error: jest.fn(),
+    warn: jest.fn(),
+    debug: jest.fn(),
+  },
+}));
+
+describe('standardCache - CONFIG_STORE vs TOOL_CACHE namespace isolation', () => {
+  afterEach(() => {
+    jest.resetModules();
+    MockKeyvRedis.mockClear();
+  });
+
+  /**
+   * Core behavioral test for blue/green deployments:
+   * When CONFIG_STORE and APP_CONFIG are forced in-memory,
+   * TOOL_CACHE should still use Redis for cross-container sharing.
+   */
+  it('should force CONFIG_STORE to in-memory while TOOL_CACHE uses Redis', async () => {
+    jest.doMock('../../cacheConfig', () => ({
+      cacheConfig: {
+        FORCED_IN_MEMORY_CACHE_NAMESPACES: [CacheKeys.CONFIG_STORE, CacheKeys.APP_CONFIG],
+        REDIS_KEY_PREFIX: '',
+        GLOBAL_PREFIX_SEPARATOR: '>>',
+      },
+    }));
+
+    const { standardCache } = await import('../../cacheFactory');
+
+    MockKeyvRedis.mockClear();
+
+    const configCache = standardCache(CacheKeys.CONFIG_STORE);
+    expect(MockKeyvRedis).not.toHaveBeenCalled();
+    expect(configCache).toBeDefined();
+
+    const appConfigCache = standardCache(CacheKeys.APP_CONFIG);
+    expect(MockKeyvRedis).not.toHaveBeenCalled();
+    expect(appConfigCache).toBeDefined();
+
+    const toolCache = standardCache(CacheKeys.TOOL_CACHE);
+    expect(MockKeyvRedis).toHaveBeenCalledTimes(1);
+    expect(MockKeyvRedis).toHaveBeenCalledWith(mockKeyvRedisClient);
+    expect(toolCache).toBeDefined();
+  });
+
+  it('CONFIG_STORE and TOOL_CACHE should be independent stores', async () => {
+    jest.doMock('../../cacheConfig', () => ({
+      cacheConfig: {
+        FORCED_IN_MEMORY_CACHE_NAMESPACES: [CacheKeys.CONFIG_STORE],
+        REDIS_KEY_PREFIX: '',
+        GLOBAL_PREFIX_SEPARATOR: '>>',
+      },
+    }));
+
+    const { standardCache } = await import('../../cacheFactory');
+
+    const configCache = standardCache(CacheKeys.CONFIG_STORE);
+    const toolCache = standardCache(CacheKeys.TOOL_CACHE);
+
+    await configCache.set('STARTUP_CONFIG', { version: 'v2-green' });
+    await toolCache.set('tools:global', { myTool: { type: 'function' } });
+
+    expect(await configCache.get('STARTUP_CONFIG')).toEqual({ version: 'v2-green' });
+    expect(await configCache.get('tools:global')).toBeUndefined();
+
+    expect(await toolCache.get('STARTUP_CONFIG')).toBeUndefined();
+  });
+
+  it('should use Redis for all namespaces when nothing is forced in-memory', async () => {
+    jest.doMock('../../cacheConfig', () => ({
+      cacheConfig: {
+        FORCED_IN_MEMORY_CACHE_NAMESPACES: [],
+        REDIS_KEY_PREFIX: '',
+        GLOBAL_PREFIX_SEPARATOR: '>>',
+      },
+    }));
+
+    const { standardCache } = await import('../../cacheFactory');
+
+    MockKeyvRedis.mockClear();
+
+    standardCache(CacheKeys.CONFIG_STORE);
+    standardCache(CacheKeys.TOOL_CACHE);
+    standardCache(CacheKeys.APP_CONFIG);
+
+    expect(MockKeyvRedis).toHaveBeenCalledTimes(3);
+  });
+
+  it('forcing TOOL_CACHE to in-memory should not affect CONFIG_STORE', async () => {
+    jest.doMock('../../cacheConfig', () => ({
+      cacheConfig: {
+        FORCED_IN_MEMORY_CACHE_NAMESPACES: [CacheKeys.TOOL_CACHE],
+        REDIS_KEY_PREFIX: '',
+        GLOBAL_PREFIX_SEPARATOR: '>>',
+      },
+    }));
+
+    const { standardCache } = await import('../../cacheFactory');
+
+    MockKeyvRedis.mockClear();
+
+    standardCache(CacheKeys.TOOL_CACHE);
+    expect(MockKeyvRedis).not.toHaveBeenCalled();
+
+    standardCache(CacheKeys.CONFIG_STORE);
+    expect(MockKeyvRedis).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/packages/api/src/cache/__tests__/cacheFactory/violationCache.cache_integration.spec.ts b/packages/api/src/cache/__tests__/cacheFactory/violationCache.cache_integration.spec.ts
index 989008e82e..1978620c24 100644
--- a/packages/api/src/cache/__tests__/cacheFactory/violationCache.cache_integration.spec.ts
+++ b/packages/api/src/cache/__tests__/cacheFactory/violationCache.cache_integration.spec.ts
@@ -20,6 +20,24 @@ interface ViolationData {
   };
 }
 
+/** Waits for both Redis clients (ioredis + keyv/node-redis) to be ready */
+async function waitForRedisClients() {
+  const redisClients = await import('../../redisClients');
+  const { ioredisClient, keyvRedisClientReady } = redisClients;
+
+  if (ioredisClient && ioredisClient.status !== 'ready') {
+    await new Promise<void>((resolve) => {
+      ioredisClient.once('ready', resolve);
+    });
+  }
+
+  if (keyvRedisClientReady) {
+    await keyvRedisClientReady;
+  }
+
+  return redisClients;
+}
+
 describe('violationCache', () => {
   let originalEnv: NodeJS.ProcessEnv;
 
@@ -45,17 +63,9 @@ describe('violationCache', () => {
 
   test('should create violation cache with Redis when USE_REDIS is true', async () => {
     const cacheFactory = await import('../../cacheFactory');
-    const redisClients = await import('../../redisClients');
-    const { ioredisClient } = redisClients;
+    await waitForRedisClients();
     const cache = cacheFactory.violationCache('test-violations', 60000); // 60 second TTL
 
-    // Wait for Redis connection to be ready
-    if (ioredisClient && ioredisClient.status !== 'ready') {
-      await new Promise<void>((resolve) => {
-        ioredisClient.once('ready', resolve);
-      });
-    }
-
     // Verify it returns a Keyv instance
     expect(cache).toBeDefined();
     expect(cache.constructor.name).toBe('Keyv');
@@ -112,18 +122,10 @@ describe('violationCache', () => {
 
   test('should respect namespace prefixing', async () => {
     const cacheFactory = await import('../../cacheFactory');
-    const redisClients = await import('../../redisClients');
-    const { ioredisClient } = redisClients;
+    await waitForRedisClients();
     const cache1 = cacheFactory.violationCache('namespace1');
     const cache2 = cacheFactory.violationCache('namespace2');
 
-    // Wait for Redis connection to be ready
-    if (ioredisClient && ioredisClient.status !== 'ready') {
-      await new Promise<void>((resolve) => {
-        ioredisClient.once('ready', resolve);
-      });
-    }
-
     const testKey = 'shared-key';
     const value1: ViolationData = { namespace: 1 };
     const value2: ViolationData = { namespace: 2 };
@@ -146,18 +148,10 @@ describe('violationCache', () => {
 
   test('should respect TTL settings', async () => {
     const cacheFactory = await import('../../cacheFactory');
-    const redisClients = await import('../../redisClients');
-    const { ioredisClient } = redisClients;
+    await waitForRedisClients();
     const ttl = 1000; // 1 second TTL
     const cache = cacheFactory.violationCache('ttl-test', ttl);
 
-    // Wait for Redis connection to be ready
-    if (ioredisClient && ioredisClient.status !== 'ready') {
-      await new Promise<void>((resolve) => {
-        ioredisClient.once('ready', resolve);
-      });
-    }
-
     const testKey = 'ttl-key';
     const testValue: ViolationData = { data: 'expires soon' };
 
@@ -178,17 +172,9 @@ describe('violationCache', () => {
 
   test('should handle complex violation data structures', async () => {
     const cacheFactory = await import('../../cacheFactory');
-    const redisClients = await import('../../redisClients');
-    const { ioredisClient } = redisClients;
+    await waitForRedisClients();
     const cache = cacheFactory.violationCache('complex-violations');
 
-    // Wait for Redis connection to be ready
-    if (ioredisClient && ioredisClient.status !== 'ready') {
-      await new Promise<void>((resolve) => {
-        ioredisClient.once('ready', resolve);
-      });
-    }
-
     const complexData: ViolationData = {
       userId: 'user123',
       violations: [
diff --git a/packages/api/src/cache/cacheConfig.ts b/packages/api/src/cache/cacheConfig.ts
index 32ea2cddd1..0d4304f5c3 100644
--- a/packages/api/src/cache/cacheConfig.ts
+++ b/packages/api/src/cache/cacheConfig.ts
@@ -27,9 +27,14 @@ const USE_REDIS_STREAMS =
 
 // Comma-separated list of cache namespaces that should be forced to use in-memory storage
 // even when Redis is enabled. This allows selective performance optimization for specific caches.
-const FORCED_IN_MEMORY_CACHE_NAMESPACES = process.env.FORCED_IN_MEMORY_CACHE_NAMESPACES
-  ? process.env.FORCED_IN_MEMORY_CACHE_NAMESPACES.split(',').map((key) => key.trim())
-  : [];
+// Defaults to CONFIG_STORE,APP_CONFIG so YAML-derived config stays per-container.
+// Set to empty string to force all namespaces through Redis.
+const FORCED_IN_MEMORY_CACHE_NAMESPACES =
+  process.env.FORCED_IN_MEMORY_CACHE_NAMESPACES !== undefined
+    ? process.env.FORCED_IN_MEMORY_CACHE_NAMESPACES.split(',')
+        .map((key) => key.trim())
+        .filter(Boolean)
+    : [CacheKeys.CONFIG_STORE, CacheKeys.APP_CONFIG];
 
 // Validate against CacheKeys enum
 if (FORCED_IN_MEMORY_CACHE_NAMESPACES.length > 0) {
diff --git a/packages/api/src/cache/cacheFactory.ts b/packages/api/src/cache/cacheFactory.ts
index 9b59afe554..2d7817c2ad 100644
--- a/packages/api/src/cache/cacheFactory.ts
+++ b/packages/api/src/cache/cacheFactory.ts
@@ -120,7 +120,9 @@ export const limiterCache = (prefix: string): RedisStore | undefined => {
   if (!cacheConfig.USE_REDIS) {
     return undefined;
   }
-  // TODO: The prefix is not actually applied. Also needs to account for global prefix.
+  // Note: The `prefix` is applied by RedisStore internally to its key operations.
+  // The global REDIS_KEY_PREFIX is applied by ioredisClient's keyPrefix setting.
+  // Combined key format: `{REDIS_KEY_PREFIX}::{prefix}{identifier}`
   prefix = prefix.endsWith(':') ? prefix : `${prefix}:`;
 
   try {
diff --git a/packages/api/src/cache/redisClients.ts b/packages/api/src/cache/redisClients.ts
index 79489336c4..fca4365f7f 100644
--- a/packages/api/src/cache/redisClients.ts
+++ b/packages/api/src/cache/redisClients.ts
@@ -29,7 +29,9 @@ if (cacheConfig.USE_REDIS) {
         );
         return null;
       }
-      const delay = Math.min(times * 50, cacheConfig.REDIS_RETRY_MAX_DELAY);
+      const base = Math.min(Math.pow(2, times) * 50, cacheConfig.REDIS_RETRY_MAX_DELAY);
+      const jitter = Math.floor(Math.random() * Math.min(base, 1000));
+      const delay = Math.min(base + jitter, cacheConfig.REDIS_RETRY_MAX_DELAY);
       logger.info(`ioredis reconnecting... attempt ${times}, delay ${delay}ms`);
       return delay;
     },
@@ -71,7 +73,9 @@ if (cacheConfig.USE_REDIS) {
                 );
                 return null;
               }
-              const delay = Math.min(times * 100, cacheConfig.REDIS_RETRY_MAX_DELAY);
+              const base = Math.min(Math.pow(2, times) * 100, cacheConfig.REDIS_RETRY_MAX_DELAY);
+              const jitter = Math.floor(Math.random() * Math.min(base, 1000));
+              const delay = Math.min(base + jitter, cacheConfig.REDIS_RETRY_MAX_DELAY);
               logger.info(`ioredis cluster reconnecting... attempt ${times}, delay ${delay}ms`);
               return delay;
             },
@@ -149,7 +153,9 @@ if (cacheConfig.USE_REDIS) {
           );
           return new Error('Max reconnection attempts reached');
         }
-        const delay = Math.min(retries * 100, cacheConfig.REDIS_RETRY_MAX_DELAY);
+        const base = Math.min(Math.pow(2, retries) * 100, cacheConfig.REDIS_RETRY_MAX_DELAY);
+        const jitter = Math.floor(Math.random() * Math.min(base, 1000));
+        const delay = Math.min(base + jitter, cacheConfig.REDIS_RETRY_MAX_DELAY);
         logger.info(`@keyv/redis reconnecting... attempt ${retries}, delay ${delay}ms`);
         return delay;
       },
diff --git a/packages/api/src/endpoints/anthropic/helpers.ts b/packages/api/src/endpoints/anthropic/helpers.ts
index 0596c1efcc..d33116a2ac 100644
--- a/packages/api/src/endpoints/anthropic/helpers.ts
+++ b/packages/api/src/endpoints/anthropic/helpers.ts
@@ -1,6 +1,12 @@
 import { logger } from '@librechat/data-schemas';
 import { AnthropicClientOptions } from '@librechat/agents';
-import { EModelEndpoint, anthropicSettings } from 'librechat-data-provider';
+import {
+  EModelEndpoint,
+  AnthropicEffort,
+  anthropicSettings,
+  supportsContext1m,
+  supportsAdaptiveThinking,
+} from 'librechat-data-provider';
 import { matchModelName } from '~/utils/tokens';
 
 /**
@@ -48,7 +54,7 @@ function getClaudeHeaders(
     return {
       'anthropic-beta': 'token-efficient-tools-2025-02-19,output-128k-2025-02-19',
     };
-  } else if (/claude-sonnet-4/.test(model)) {
+  } else if (supportsContext1m(model)) {
     return {
       'anthropic-beta': 'context-1m-2025-08-07',
     };
@@ -58,25 +64,43 @@ function getClaudeHeaders(
 }
 
 /**
- * Configures reasoning-related options for Claude models
- * @param {AnthropicClientOptions & { max_tokens?: number }} anthropicInput The request options object
- * @param {Object} extendedOptions Additional client configuration options
- * @param {boolean} extendedOptions.thinking Whether thinking is enabled in client config
- * @param {number|null} extendedOptions.thinkingBudget The token budget for thinking
- * @returns {Object} Updated request options
+ * Configures reasoning-related options for Claude models.
+ * Models supporting adaptive thinking (Opus 4.6+, Sonnet 4.6+) use effort control instead of manual budget_tokens.
  */
 function configureReasoning(
   anthropicInput: AnthropicClientOptions & { max_tokens?: number },
-  extendedOptions: { thinking?: boolean; thinkingBudget?: number | null } = {},
+  extendedOptions: {
+    thinking?: boolean;
+    thinkingBudget?: number | null;
+    effort?: AnthropicEffort | string | null;
+  } = {},
 ): AnthropicClientOptions & { max_tokens?: number } {
   const updatedOptions = { ...anthropicInput };
   const currentMaxTokens = updatedOptions.max_tokens ?? updatedOptions.maxTokens;
+  const modelName = updatedOptions.model ?? '';
+
+  if (extendedOptions.thinking && modelName && supportsAdaptiveThinking(modelName)) {
+    updatedOptions.thinking = { type: 'adaptive' };
+
+    const effort = extendedOptions.effort;
+    if (effort && effort !== AnthropicEffort.unset) {
+      updatedOptions.invocationKwargs = {
+        ...updatedOptions.invocationKwargs,
+        output_config: { effort },
+      };
+    }
+
+    if (currentMaxTokens == null) {
+      updatedOptions.max_tokens = anthropicSettings.maxOutputTokens.reset(modelName);
+    }
+
+    return updatedOptions;
+  }
 
   if (
     extendedOptions.thinking &&
-    updatedOptions?.model &&
-    (/claude-3[-.]7/.test(updatedOptions.model) ||
-      /claude-(?:sonnet|opus|haiku)-[4-9]/.test(updatedOptions.model))
+    modelName &&
+    (/claude-3[-.]7/.test(modelName) || /claude-(?:sonnet|opus|haiku)-[4-9]/.test(modelName))
   ) {
     updatedOptions.thinking = {
       ...updatedOptions.thinking,
@@ -100,7 +124,7 @@ function configureReasoning(
     updatedOptions.thinking.type === 'enabled' &&
     (currentMaxTokens == null || updatedOptions.thinking.budget_tokens > currentMaxTokens)
   ) {
-    const maxTokens = anthropicSettings.maxOutputTokens.reset(updatedOptions.model ?? '');
+    const maxTokens = anthropicSettings.maxOutputTokens.reset(modelName);
     updatedOptions.max_tokens = currentMaxTokens ?? maxTokens;
 
     logger.warn(
@@ -111,11 +135,11 @@ function configureReasoning(
 
     updatedOptions.thinking.budget_tokens = Math.min(
       updatedOptions.thinking.budget_tokens,
-      Math.floor(updatedOptions.max_tokens * 0.9),
+      Math.floor((updatedOptions.max_tokens ?? 0) * 0.9),
     );
   }
 
   return updatedOptions;
 }
 
-export { checkPromptCacheSupport, getClaudeHeaders, configureReasoning };
+export { checkPromptCacheSupport, getClaudeHeaders, configureReasoning, supportsAdaptiveThinking };
diff --git a/packages/api/src/endpoints/anthropic/initialize.ts b/packages/api/src/endpoints/anthropic/initialize.ts
index 58237b9604..8bebd8467b 100644
--- a/packages/api/src/endpoints/anthropic/initialize.ts
+++ b/packages/api/src/endpoints/anthropic/initialize.ts
@@ -77,13 +77,11 @@ export async function initializeAnthropic({
     ...(vertexConfig && { vertexConfig }),
   };
 
-  /** @type {undefined | TBaseEndpoint} */
   const anthropicConfig = appConfig?.endpoints?.[EModelEndpoint.anthropic];
   const allConfig = appConfig?.endpoints?.all;
 
   const result = getLLMConfig(credentials, clientOptions);
 
-  // Apply stream rate delay
   if (anthropicConfig?.streamRate) {
     (result.llmConfig as Record<string, unknown>)._lc_stream_delay = anthropicConfig.streamRate;
   }
diff --git a/packages/api/src/endpoints/anthropic/llm.spec.ts b/packages/api/src/endpoints/anthropic/llm.spec.ts
index c15d5445ed..b945eacb34 100644
--- a/packages/api/src/endpoints/anthropic/llm.spec.ts
+++ b/packages/api/src/endpoints/anthropic/llm.spec.ts
@@ -1,5 +1,6 @@
-import { getLLMConfig } from './llm';
+import { AnthropicEffort } from 'librechat-data-provider';
 import type * as t from '~/types';
+import { getLLMConfig } from './llm';
 
 jest.mock('https-proxy-agent', () => ({
   HttpsProxyAgent: jest.fn().mockImplementation((proxy) => ({ proxy })),
@@ -120,6 +121,39 @@ describe('getLLMConfig', () => {
     });
   });
 
+  it('should add "context-1m" beta header for claude-sonnet-4-6 model', () => {
+    const modelOptions = {
+      model: 'claude-sonnet-4-6',
+      promptCache: true,
+    };
+    const result = getLLMConfig('test-key', { modelOptions });
+    const clientOptions = result.llmConfig.clientOptions;
+    expect(clientOptions?.defaultHeaders).toBeDefined();
+    expect(clientOptions?.defaultHeaders).toHaveProperty('anthropic-beta');
+    const defaultHeaders = clientOptions?.defaultHeaders as Record<string, string>;
+    expect(defaultHeaders['anthropic-beta']).toBe('context-1m-2025-08-07');
+    expect(result.llmConfig.promptCache).toBe(true);
+  });
+
+  it('should add "context-1m" beta header for claude-sonnet-4-6 model formats', () => {
+    const modelVariations = [
+      'claude-sonnet-4-6',
+      'claude-sonnet-4-6-20260101',
+      'anthropic/claude-sonnet-4-6',
+    ];
+
+    modelVariations.forEach((model) => {
+      const modelOptions = { model, promptCache: true };
+      const result = getLLMConfig('test-key', { modelOptions });
+      const clientOptions = result.llmConfig.clientOptions;
+      expect(clientOptions?.defaultHeaders).toBeDefined();
+      expect(clientOptions?.defaultHeaders).toHaveProperty('anthropic-beta');
+      const defaultHeaders = clientOptions?.defaultHeaders as Record<string, string>;
+      expect(defaultHeaders['anthropic-beta']).toBe('context-1m-2025-08-07');
+      expect(result.llmConfig.promptCache).toBe(true);
+    });
+  });
+
   it('should pass promptCache boolean for claude-opus-4-5 model (no beta header needed)', () => {
     const modelOptions = {
       model: 'claude-opus-4-5',
@@ -835,13 +869,19 @@ describe('getLLMConfig', () => {
           expect(result.llmConfig.maxTokens).toBe(32000);
         });
 
-        // opus-4-5+ get 64K
-        const opus64kModels = ['claude-opus-4-5', 'claude-opus-4-7', 'claude-opus-4-10'];
-        opus64kModels.forEach((model) => {
+        // opus-4-5 gets 64K
+        const opus64kResult = getLLMConfig('test-key', {
+          modelOptions: { model: 'claude-opus-4-5' },
+        });
+        expect(opus64kResult.llmConfig.maxTokens).toBe(64000);
+
+        // opus-4-6+ get 128K
+        const opus128kModels = ['claude-opus-4-7', 'claude-opus-4-10'];
+        opus128kModels.forEach((model) => {
           const result = getLLMConfig('test-key', {
             modelOptions: { model },
           });
-          expect(result.llmConfig.maxTokens).toBe(64000);
+          expect(result.llmConfig.maxTokens).toBe(128000);
         });
       });
 
@@ -910,6 +950,171 @@ describe('getLLMConfig', () => {
         expect(result.llmConfig.maxTokens).toBe(32000);
       });
 
+      it('should use adaptive thinking for Opus 4.6 instead of enabled + budget_tokens', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-opus-4-6',
+            thinking: true,
+            thinkingBudget: 10000,
+          },
+        });
+
+        expect((result.llmConfig.thinking as unknown as { type: string }).type).toBe('adaptive');
+        expect(result.llmConfig.thinking).not.toHaveProperty('budget_tokens');
+        expect(result.llmConfig.maxTokens).toBe(128000);
+      });
+
+      it('should set effort via output_config for adaptive thinking models', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-opus-4-6',
+            thinking: true,
+            effort: AnthropicEffort.medium,
+          },
+        });
+
+        expect((result.llmConfig.thinking as unknown as { type: string }).type).toBe('adaptive');
+        expect(result.llmConfig.invocationKwargs).toHaveProperty('output_config');
+        expect(result.llmConfig.invocationKwargs?.output_config).toEqual({
+          effort: AnthropicEffort.medium,
+        });
+      });
+
+      it('should set effort via output_config even without thinking for adaptive models', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-opus-4-6',
+            thinking: false,
+            effort: AnthropicEffort.low,
+          },
+        });
+
+        expect(result.llmConfig.thinking).toBeUndefined();
+        expect(result.llmConfig.invocationKwargs).toHaveProperty('output_config');
+        expect(result.llmConfig.invocationKwargs?.output_config).toEqual({
+          effort: AnthropicEffort.low,
+        });
+      });
+
+      it('should use adaptive thinking for Sonnet 4.6 instead of enabled + budget_tokens', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-sonnet-4-6',
+            thinking: true,
+            thinkingBudget: 10000,
+          },
+        });
+
+        expect((result.llmConfig.thinking as unknown as { type: string }).type).toBe('adaptive');
+        expect(result.llmConfig.thinking).not.toHaveProperty('budget_tokens');
+        expect(result.llmConfig.maxTokens).toBe(64000);
+      });
+
+      it('should set effort via output_config for Sonnet 4.6', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-sonnet-4-6',
+            thinking: true,
+            effort: AnthropicEffort.high,
+          },
+        });
+
+        expect((result.llmConfig.thinking as unknown as { type: string }).type).toBe('adaptive');
+        expect(result.llmConfig.invocationKwargs).toHaveProperty('output_config');
+        expect(result.llmConfig.invocationKwargs?.output_config).toEqual({
+          effort: AnthropicEffort.high,
+        });
+      });
+
+      it('should exclude topP/topK for Sonnet 4.6 with adaptive thinking', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-sonnet-4-6',
+            thinking: true,
+            topP: 0.9,
+            topK: 40,
+          },
+        });
+
+        expect((result.llmConfig.thinking as unknown as { type: string }).type).toBe('adaptive');
+        expect(result.llmConfig).not.toHaveProperty('topP');
+        expect(result.llmConfig).not.toHaveProperty('topK');
+      });
+
+      it('should NOT set adaptive thinking or effort for non-adaptive models', () => {
+        const nonAdaptiveModels = [
+          'claude-opus-4-5',
+          'claude-opus-4-1',
+          'claude-sonnet-4-5',
+          'claude-sonnet-4',
+          'claude-haiku-4-5',
+        ];
+
+        nonAdaptiveModels.forEach((model) => {
+          const result = getLLMConfig('test-key', {
+            modelOptions: {
+              model,
+              thinking: true,
+              thinkingBudget: 10000,
+              effort: AnthropicEffort.medium,
+            },
+          });
+
+          if (result.llmConfig.thinking != null) {
+            expect((result.llmConfig.thinking as unknown as { type: string }).type).not.toBe(
+              'adaptive',
+            );
+          }
+          expect(result.llmConfig.invocationKwargs?.output_config).toBeUndefined();
+        });
+      });
+
+      it('should strip adaptive thinking if it somehow reaches a non-adaptive model', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-sonnet-4-5',
+            thinking: true,
+            thinkingBudget: 5000,
+          },
+        });
+
+        expect(result.llmConfig.thinking).toMatchObject({
+          type: 'enabled',
+          budget_tokens: 5000,
+        });
+        expect(result.llmConfig.invocationKwargs?.output_config).toBeUndefined();
+      });
+
+      it('should exclude topP/topK for Opus 4.6 with adaptive thinking', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-opus-4-6',
+            thinking: true,
+            topP: 0.9,
+            topK: 40,
+          },
+        });
+
+        expect((result.llmConfig.thinking as unknown as { type: string }).type).toBe('adaptive');
+        expect(result.llmConfig).not.toHaveProperty('topP');
+        expect(result.llmConfig).not.toHaveProperty('topK');
+      });
+
+      it('should include topP/topK for Opus 4.6 when thinking is disabled', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-opus-4-6',
+            thinking: false,
+            topP: 0.9,
+            topK: 40,
+          },
+        });
+
+        expect(result.llmConfig.thinking).toBeUndefined();
+        expect(result.llmConfig).toHaveProperty('topP', 0.9);
+        expect(result.llmConfig).toHaveProperty('topK', 40);
+      });
+
       it('should respect model-specific maxOutputTokens for Claude 4.x models', () => {
         const testCases = [
           { model: 'claude-sonnet-4-5', maxOutputTokens: 50000, expected: 50000 },
@@ -960,7 +1165,7 @@ describe('getLLMConfig', () => {
         });
       });
 
-      it('should future-proof Claude 5.x Opus models with 64K default', () => {
+      it('should future-proof Claude 5.x Opus models with 128K default', () => {
         const testCases = [
           'claude-opus-5',
           'claude-opus-5-0',
@@ -972,28 +1177,28 @@ describe('getLLMConfig', () => {
           const result = getLLMConfig('test-key', {
             modelOptions: { model },
           });
-          expect(result.llmConfig.maxTokens).toBe(64000);
+          expect(result.llmConfig.maxTokens).toBe(128000);
         });
       });
 
       it('should future-proof Claude 6-9.x models with correct defaults', () => {
         const testCases = [
-          // Claude 6.x - All get 64K since they're version 5+
+          // Claude 6.x - Sonnet/Haiku get 64K, Opus gets 128K
           { model: 'claude-sonnet-6', expected: 64000 },
           { model: 'claude-haiku-6-0', expected: 64000 },
-          { model: 'claude-opus-6-1', expected: 64000 }, // opus 6+ gets 64K
+          { model: 'claude-opus-6-1', expected: 128000 },
           // Claude 7.x
           { model: 'claude-sonnet-7-20270101', expected: 64000 },
           { model: 'claude-haiku-7.5', expected: 64000 },
-          { model: 'claude-opus-7', expected: 64000 }, // opus 7+ gets 64K
+          { model: 'claude-opus-7', expected: 128000 },
           // Claude 8.x
           { model: 'claude-sonnet-8', expected: 64000 },
           { model: 'claude-haiku-8-2', expected: 64000 },
-          { model: 'claude-opus-8-latest', expected: 64000 }, // opus 8+ gets 64K
+          { model: 'claude-opus-8-latest', expected: 128000 },
           // Claude 9.x
           { model: 'claude-sonnet-9', expected: 64000 },
           { model: 'claude-haiku-9', expected: 64000 },
-          { model: 'claude-opus-9', expected: 64000 }, // opus 9+ gets 64K
+          { model: 'claude-opus-9', expected: 128000 },
         ];
 
         testCases.forEach(({ model, expected }) => {
diff --git a/packages/api/src/endpoints/anthropic/llm.ts b/packages/api/src/endpoints/anthropic/llm.ts
index 34ec354365..d792adef4e 100644
--- a/packages/api/src/endpoints/anthropic/llm.ts
+++ b/packages/api/src/endpoints/anthropic/llm.ts
@@ -7,7 +7,12 @@ import type {
   AnthropicConfigOptions,
   AnthropicCredentials,
 } from '~/types/anthropic';
-import { checkPromptCacheSupport, getClaudeHeaders, configureReasoning } from './helpers';
+import {
+  supportsAdaptiveThinking,
+  checkPromptCacheSupport,
+  configureReasoning,
+  getClaudeHeaders,
+} from './helpers';
 import {
   createAnthropicVertexClient,
   isAnthropicVertexCredentials,
@@ -83,15 +88,14 @@ function getLLMConfig(
     promptCache: options.modelOptions?.promptCache ?? anthropicSettings.promptCache.default,
     thinkingBudget:
       options.modelOptions?.thinkingBudget ?? anthropicSettings.thinkingBudget.default,
+    effort: options.modelOptions?.effort ?? anthropicSettings.effort.default,
   };
 
-  /** Couldn't figure out a way to still loop through the object while deleting the overlapping keys when porting this
-   * over from javascript, so for now they are being deleted manually until a better way presents itself.
-   */
   if (options.modelOptions) {
     delete options.modelOptions.thinking;
     delete options.modelOptions.promptCache;
     delete options.modelOptions.thinkingBudget;
+    delete options.modelOptions.effort;
   } else {
     throw new Error('No modelOptions provided');
   }
@@ -145,10 +149,33 @@ function getLLMConfig(
 
   requestOptions = configureReasoning(requestOptions, systemOptions);
 
-  if (!/claude-3[-.]7/.test(mergedOptions.model)) {
-    requestOptions.topP = mergedOptions.topP;
-    requestOptions.topK = mergedOptions.topK;
-  } else if (requestOptions.thinking == null) {
+  if (supportsAdaptiveThinking(mergedOptions.model)) {
+    if (
+      systemOptions.effort &&
+      (systemOptions.effort as string) !== '' &&
+      !requestOptions.invocationKwargs?.output_config
+    ) {
+      requestOptions.invocationKwargs = {
+        ...requestOptions.invocationKwargs,
+        output_config: { effort: systemOptions.effort },
+      };
+    }
+  } else {
+    if (
+      requestOptions.thinking != null &&
+      (requestOptions.thinking as unknown as { type: string }).type === 'adaptive'
+    ) {
+      delete requestOptions.thinking;
+    }
+    if (requestOptions.invocationKwargs?.output_config) {
+      delete requestOptions.invocationKwargs.output_config;
+    }
+  }
+
+  const hasActiveThinking = requestOptions.thinking != null;
+  const isThinkingModel =
+    /claude-3[-.]7/.test(mergedOptions.model) || supportsAdaptiveThinking(mergedOptions.model);
+  if (!isThinkingModel || !hasActiveThinking) {
     requestOptions.topP = mergedOptions.topP;
     requestOptions.topK = mergedOptions.topK;
   }
diff --git a/packages/api/src/endpoints/anthropic/vertex.ts b/packages/api/src/endpoints/anthropic/vertex.ts
index 12967f1a58..179aca4d74 100644
--- a/packages/api/src/endpoints/anthropic/vertex.ts
+++ b/packages/api/src/endpoints/anthropic/vertex.ts
@@ -1,10 +1,10 @@
 import path from 'path';
-import { AnthropicVertex } from '@anthropic-ai/vertex-sdk';
 import { GoogleAuth } from 'google-auth-library';
-import { ClientOptions } from '@anthropic-ai/sdk';
 import { AuthKeys } from 'librechat-data-provider';
-import { loadServiceKey } from '~/utils/key';
+import { AnthropicVertex } from '@anthropic-ai/vertex-sdk';
+import type { ClientOptions } from '@anthropic-ai/sdk';
 import type { AnthropicCredentials, VertexAIClientOptions } from '~/types/anthropic';
+import { loadServiceKey } from '~/utils/key';
 
 /**
  * Options for loading Vertex AI credentials
@@ -112,10 +112,6 @@ function filterVertexHeaders(headers?: Record<string, string>): Record<string, s
         if (v.includes('token-efficient-tools')) {
           return false;
         }
-        // Remove context-1m headers
-        if (v.includes('context-1m')) {
-          return false;
-        }
         return true;
       });
 
diff --git a/packages/api/src/endpoints/bedrock/initialize.spec.ts b/packages/api/src/endpoints/bedrock/initialize.spec.ts
index 9b0ba152d7..2b83c55937 100644
--- a/packages/api/src/endpoints/bedrock/initialize.spec.ts
+++ b/packages/api/src/endpoints/bedrock/initialize.spec.ts
@@ -313,4 +313,413 @@ describe('initializeBedrock', () => {
       expect(typeof result.configOptions).toBe('object');
     });
   });
+
+  describe('Inference Profile Configuration', () => {
+    it('should set applicationInferenceProfile when model has matching inference profile config', async () => {
+      const inferenceProfileArn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123';
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': inferenceProfileArn,
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', inferenceProfileArn);
+    });
+
+    it('should NOT set applicationInferenceProfile when model has no matching config', async () => {
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-sonnet-4-5-20250929-v1:0':
+                  'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/xyz789',
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0', // Different model
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).not.toHaveProperty('applicationInferenceProfile');
+    });
+
+    it('should resolve environment variable in inference profile ARN', async () => {
+      const inferenceProfileArn =
+        'arn:aws:bedrock:us-east-1:951834775723:application-inference-profile/yjr1elcyt29s';
+      process.env.BEDROCK_INFERENCE_PROFILE_ARN = inferenceProfileArn;
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': '${BEDROCK_INFERENCE_PROFILE_ARN}',
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', inferenceProfileArn);
+    });
+
+    it('should use direct ARN when no env variable syntax is used', async () => {
+      const directArn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/direct123';
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': directArn,
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', directArn);
+    });
+
+    it('should fall back to original string when env variable is not set', async () => {
+      // Ensure the env var is not set
+      delete process.env.NONEXISTENT_PROFILE_ARN;
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': '${NONEXISTENT_PROFILE_ARN}',
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      // Should return the original ${VAR} string when env var doesn't exist
+      expect(result.llmConfig).toHaveProperty(
+        'applicationInferenceProfile',
+        '${NONEXISTENT_PROFILE_ARN}',
+      );
+    });
+
+    it('should resolve multiple different env variables for different models', async () => {
+      const claude37Arn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/claude37';
+      const sonnet45Arn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/sonnet45';
+
+      process.env.CLAUDE_37_PROFILE = claude37Arn;
+      process.env.SONNET_45_PROFILE = sonnet45Arn;
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': '${CLAUDE_37_PROFILE}',
+                'us.anthropic.claude-sonnet-4-5-20250929-v1:0': '${SONNET_45_PROFILE}',
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', claude37Arn);
+    });
+
+    it('should handle env variable with whitespace around it', async () => {
+      const inferenceProfileArn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/trimmed';
+      process.env.TRIMMED_PROFILE_ARN = inferenceProfileArn;
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': '  ${TRIMMED_PROFILE_ARN}  ',
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', inferenceProfileArn);
+    });
+
+    it('should NOT set applicationInferenceProfile when inferenceProfiles config is empty', async () => {
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {},
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).not.toHaveProperty('applicationInferenceProfile');
+    });
+
+    it('should NOT set applicationInferenceProfile when no bedrock config exists', async () => {
+      const params = createMockParams({
+        config: {},
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).not.toHaveProperty('applicationInferenceProfile');
+    });
+
+    it('should handle multiple inference profiles and select the correct one', async () => {
+      const sonnet45Arn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/sonnet45';
+      const claude37Arn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/claude37';
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-sonnet-4-5-20250929-v1:0': sonnet45Arn,
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': claude37Arn,
+                'global.anthropic.claude-opus-4-5-20251101-v1:0':
+                  'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/opus45',
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', claude37Arn);
+    });
+
+    it('should work alongside guardrailConfig', async () => {
+      const inferenceProfileArn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123';
+      const guardrailConfig = {
+        guardrailIdentifier: 'test-guardrail',
+        guardrailVersion: '1',
+      };
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': inferenceProfileArn,
+              },
+              guardrailConfig,
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', inferenceProfileArn);
+      expect(result.llmConfig).toHaveProperty('guardrailConfig', guardrailConfig);
+    });
+
+    it('should preserve the original model ID in llmConfig.model', async () => {
+      const inferenceProfileArn =
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123';
+
+      const params = createMockParams({
+        config: {
+          endpoints: {
+            [EModelEndpoint.bedrock]: {
+              inferenceProfiles: {
+                'us.anthropic.claude-3-7-sonnet-20250219-v1:0': inferenceProfileArn,
+              },
+            },
+          },
+        },
+        model_parameters: {
+          model: 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      // Model ID should remain unchanged - only applicationInferenceProfile should be set
+      expect(result.llmConfig).toHaveProperty(
+        'model',
+        'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
+      );
+      expect(result.llmConfig).toHaveProperty('applicationInferenceProfile', inferenceProfileArn);
+    });
+  });
+
+  describe('Opus 4.6 Adaptive Thinking', () => {
+    it('should configure adaptive thinking with no default maxTokens for Opus 4.6', async () => {
+      const params = createMockParams({
+        model_parameters: {
+          model: 'anthropic.claude-opus-4-6-v1',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+      const amrf = result.llmConfig.additionalModelRequestFields as Record<string, unknown>;
+
+      expect(amrf.thinking).toEqual({ type: 'adaptive' });
+      expect(result.llmConfig.maxTokens).toBeUndefined();
+      expect(amrf.anthropic_beta).toEqual(
+        expect.arrayContaining(['output-128k-2025-02-19', 'context-1m-2025-08-07']),
+      );
+    });
+
+    it('should pass effort via output_config for Opus 4.6', async () => {
+      const params = createMockParams({
+        model_parameters: {
+          model: 'anthropic.claude-opus-4-6-v1',
+          effort: 'medium',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+      const amrf = result.llmConfig.additionalModelRequestFields as Record<string, unknown>;
+
+      expect(amrf.thinking).toEqual({ type: 'adaptive' });
+      expect(amrf.output_config).toEqual({ effort: 'medium' });
+    });
+
+    it('should respect user-provided maxTokens for Opus 4.6', async () => {
+      const params = createMockParams({
+        model_parameters: {
+          model: 'anthropic.claude-opus-4-6-v1',
+          maxTokens: 32000,
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+
+      expect(result.llmConfig.maxTokens).toBe(32000);
+    });
+
+    it('should handle cross-region Opus 4.6 model IDs', async () => {
+      const params = createMockParams({
+        model_parameters: {
+          model: 'us.anthropic.claude-opus-4-6-v1',
+          effort: 'low',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+      const amrf = result.llmConfig.additionalModelRequestFields as Record<string, unknown>;
+
+      expect(result.llmConfig).toHaveProperty('model', 'us.anthropic.claude-opus-4-6-v1');
+      expect(amrf.thinking).toEqual({ type: 'adaptive' });
+      expect(amrf.output_config).toEqual({ effort: 'low' });
+    });
+
+    it('should use enabled thinking for non-adaptive models (Sonnet 4.5)', async () => {
+      const params = createMockParams({
+        model_parameters: {
+          model: 'anthropic.claude-sonnet-4-5-20250929-v1:0',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+      const amrf = result.llmConfig.additionalModelRequestFields as Record<string, unknown>;
+
+      expect(amrf.thinking).toEqual({ type: 'enabled', budget_tokens: 2000 });
+      expect(amrf.output_config).toBeUndefined();
+      expect(result.llmConfig.maxTokens).toBe(8192);
+    });
+
+    it('should not include output_config when effort is empty', async () => {
+      const params = createMockParams({
+        model_parameters: {
+          model: 'anthropic.claude-opus-4-6-v1',
+          effort: '',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+      const amrf = result.llmConfig.additionalModelRequestFields as Record<string, unknown>;
+
+      expect(amrf.thinking).toEqual({ type: 'adaptive' });
+      expect(amrf.output_config).toBeUndefined();
+    });
+
+    it('should strip effort for non-adaptive models', async () => {
+      const params = createMockParams({
+        model_parameters: {
+          model: 'anthropic.claude-opus-4-1-20250805-v1:0',
+          effort: 'high',
+        },
+      });
+
+      const result = (await initializeBedrock(params)) as BedrockLLMConfigResult;
+      const amrf = result.llmConfig.additionalModelRequestFields as Record<string, unknown>;
+
+      expect(amrf.thinking).toEqual({ type: 'enabled', budget_tokens: 2000 });
+      expect(amrf.output_config).toBeUndefined();
+      expect(amrf.effort).toBeUndefined();
+    });
+  });
 });
diff --git a/packages/api/src/endpoints/bedrock/initialize.ts b/packages/api/src/endpoints/bedrock/initialize.ts
index 9f5db47bf7..f3ba459ba5 100644
--- a/packages/api/src/endpoints/bedrock/initialize.ts
+++ b/packages/api/src/endpoints/bedrock/initialize.ts
@@ -4,6 +4,7 @@ import { BedrockRuntimeClient } from '@aws-sdk/client-bedrock-runtime';
 import {
   AuthType,
   EModelEndpoint,
+  extractEnvVariable,
   bedrockInputParser,
   bedrockOutputParser,
   removeNullishValues,
@@ -13,6 +14,7 @@ import type {
   InitializeResultBase,
   BedrockCredentials,
   GuardrailConfiguration,
+  InferenceProfileConfig,
 } from '~/types';
 import { checkUserKeyExpiry } from '~/utils';
 
@@ -49,7 +51,10 @@ export async function initializeBedrock({
   void endpoint;
   const appConfig = req.config;
   const bedrockConfig = appConfig?.endpoints?.[EModelEndpoint.bedrock] as
-    | ({ guardrailConfig?: GuardrailConfiguration } & Record<string, unknown>)
+    | ({
+        guardrailConfig?: GuardrailConfiguration;
+        inferenceProfiles?: InferenceProfileConfig;
+      } & Record<string, unknown>)
     | undefined;
 
   const {
@@ -105,17 +110,25 @@ export async function initializeBedrock({
       }),
     ),
   ) as InitializeResultBase['llmConfig'] & {
+    model?: string;
     region?: string;
     client?: BedrockRuntimeClient;
     credentials?: BedrockCredentials;
     endpointHost?: string;
     guardrailConfig?: GuardrailConfiguration;
+    applicationInferenceProfile?: string;
   };
 
   if (bedrockConfig?.guardrailConfig) {
     llmConfig.guardrailConfig = bedrockConfig.guardrailConfig;
   }
 
+  const model = model_parameters?.model as string | undefined;
+  if (model && bedrockConfig?.inferenceProfiles?.[model]) {
+    const applicationInferenceProfile = extractEnvVariable(bedrockConfig.inferenceProfiles[model]);
+    llmConfig.applicationInferenceProfile = applicationInferenceProfile;
+  }
+
   /** Only include credentials if they're complete (accessKeyId and secretAccessKey are both set) */
   const hasCompleteCredentials =
     credentials &&
diff --git a/packages/api/src/endpoints/config.ts b/packages/api/src/endpoints/config.ts
index 041f8ca73d..97246fa336 100644
--- a/packages/api/src/endpoints/config.ts
+++ b/packages/api/src/endpoints/config.ts
@@ -21,7 +21,7 @@ export type InitializeFn = (params: BaseInitializeParams) => Promise<InitializeR
  * @returns True if the provider is a known custom provider, false otherwise
  */
 export function isKnownCustomProvider(provider?: string): boolean {
-  return [Providers.XAI, Providers.DEEPSEEK, Providers.OPENROUTER].includes(
+  return [Providers.XAI, Providers.DEEPSEEK, Providers.OPENROUTER, Providers.MOONSHOT].includes(
     (provider?.toLowerCase() ?? '') as Providers,
   );
 }
@@ -32,6 +32,7 @@ export function isKnownCustomProvider(provider?: string): boolean {
 export const providerConfigMap: Record<string, InitializeFn> = {
   [Providers.XAI]: initializeCustom,
   [Providers.DEEPSEEK]: initializeCustom,
+  [Providers.MOONSHOT]: initializeCustom,
   [Providers.OPENROUTER]: initializeCustom,
   [EModelEndpoint.openAI]: initializeOpenAI,
   [EModelEndpoint.google]: initializeGoogle,
diff --git a/packages/api/src/endpoints/custom/initialize.ts b/packages/api/src/endpoints/custom/initialize.ts
index 4550fa9f5b..7930b1c12f 100644
--- a/packages/api/src/endpoints/custom/initialize.ts
+++ b/packages/api/src/endpoints/custom/initialize.ts
@@ -31,7 +31,6 @@ function buildCustomOptions(
     customParams: endpointConfig.customParams,
     titleConvo: endpointConfig.titleConvo,
     titleModel: endpointConfig.titleModel,
-    forcePrompt: endpointConfig.forcePrompt,
     summaryModel: endpointConfig.summaryModel,
     modelDisplayLabel: endpointConfig.modelDisplayLabel,
     titleMethod: endpointConfig.titleMethod ?? 'completion',
diff --git a/packages/api/src/endpoints/openai/config.spec.ts b/packages/api/src/endpoints/openai/config.spec.ts
index 405873490f..93864649f9 100644
--- a/packages/api/src/endpoints/openai/config.spec.ts
+++ b/packages/api/src/endpoints/openai/config.spec.ts
@@ -1300,7 +1300,6 @@ describe('getOpenAIConfig', () => {
             max_completion_tokens: 4000,
           },
           dropParams: ['frequency_penalty'],
-          forcePrompt: false,
           modelOptions: {
             model: modelName,
             user: 'azure-user-123',
@@ -1395,7 +1394,6 @@ describe('getOpenAIConfig', () => {
           dropParams: ['presence_penalty'],
           titleConvo: true,
           titleModel: 'gpt-3.5-turbo',
-          forcePrompt: false,
           summaryModel: 'gpt-3.5-turbo',
           modelDisplayLabel: 'Custom GPT-4',
           titleMethod: 'completion',
@@ -1414,7 +1412,6 @@ describe('getOpenAIConfig', () => {
           customParams: {},
           titleConvo: endpointConfig.titleConvo,
           titleModel: endpointConfig.titleModel,
-          forcePrompt: endpointConfig.forcePrompt,
           summaryModel: endpointConfig.summaryModel,
           modelDisplayLabel: endpointConfig.modelDisplayLabel,
           titleMethod: endpointConfig.titleMethod,
diff --git a/packages/api/src/files/index.ts b/packages/api/src/files/index.ts
index 8397878355..3aedc5ba9d 100644
--- a/packages/api/src/files/index.ts
+++ b/packages/api/src/files/index.ts
@@ -5,5 +5,6 @@ export * from './filter';
 export * from './mistral/crud';
 export * from './ocr';
 export * from './parse';
+export * from './rag';
 export * from './validation';
 export * from './text';
diff --git a/packages/api/src/files/rag.spec.ts b/packages/api/src/files/rag.spec.ts
new file mode 100644
index 0000000000..9d8ea2d4b3
--- /dev/null
+++ b/packages/api/src/files/rag.spec.ts
@@ -0,0 +1,150 @@
+jest.mock('@librechat/data-schemas', () => ({
+	logger: {
+		debug: jest.fn(),
+		warn: jest.fn(),
+		error: jest.fn(),
+	},
+}));
+
+jest.mock('~/crypto/jwt', () => ({
+	generateShortLivedToken: jest.fn().mockReturnValue('mock-jwt-token'),
+}));
+
+jest.mock('axios', () => ({
+	delete: jest.fn(),
+	interceptors: {
+		request: { use: jest.fn(), eject: jest.fn() },
+		response: { use: jest.fn(), eject: jest.fn() },
+	},
+}));
+
+import axios from 'axios';
+import { deleteRagFile } from './rag';
+import { logger } from '@librechat/data-schemas';
+import { generateShortLivedToken } from '~/crypto/jwt';
+
+const mockedAxios = axios as jest.Mocked<typeof axios>;
+const mockedLogger = logger as jest.Mocked<typeof logger>;
+const mockedGenerateShortLivedToken = generateShortLivedToken as jest.MockedFunction<
+	typeof generateShortLivedToken
+>;
+
+describe('deleteRagFile', () => {
+	const originalEnv = process.env;
+
+	beforeEach(() => {
+		jest.clearAllMocks();
+		process.env = { ...originalEnv };
+		process.env.RAG_API_URL = 'http://localhost:8000';
+	});
+
+	afterEach(() => {
+		process.env = originalEnv;
+	});
+
+	describe('when file is embedded and RAG_API_URL is configured', () => {
+		it('should delete the document from RAG API successfully', async () => {
+			const file = { file_id: 'file-123', embedded: true };
+			mockedAxios.delete.mockResolvedValueOnce({ status: 200 });
+
+			const result = await deleteRagFile({ userId: 'user123', file });
+
+			expect(result).toBe(true);
+			expect(mockedGenerateShortLivedToken).toHaveBeenCalledWith('user123');
+			expect(mockedAxios.delete).toHaveBeenCalledWith('http://localhost:8000/documents', {
+				headers: {
+					Authorization: 'Bearer mock-jwt-token',
+					'Content-Type': 'application/json',
+					accept: 'application/json',
+				},
+				data: ['file-123'],
+			});
+			expect(mockedLogger.debug).toHaveBeenCalledWith(
+				'[deleteRagFile] Successfully deleted document file-123 from RAG API',
+			);
+		});
+
+		it('should return true and log warning when document is not found (404)', async () => {
+			const file = { file_id: 'file-not-found', embedded: true };
+			const error = new Error('Not Found') as Error & { response?: { status?: number } };
+			error.response = { status: 404 };
+			mockedAxios.delete.mockRejectedValueOnce(error);
+
+			const result = await deleteRagFile({ userId: 'user123', file });
+
+			expect(result).toBe(true);
+			expect(mockedLogger.warn).toHaveBeenCalledWith(
+				'[deleteRagFile] Document file-not-found not found in RAG API, may have been deleted already',
+			);
+		});
+
+		it('should return false and log error on other errors', async () => {
+			const file = { file_id: 'file-error', embedded: true };
+			const error = new Error('Server Error') as Error & { response?: { status?: number } };
+			error.response = { status: 500 };
+			mockedAxios.delete.mockRejectedValueOnce(error);
+
+			const result = await deleteRagFile({ userId: 'user123', file });
+
+			expect(result).toBe(false);
+			expect(mockedLogger.error).toHaveBeenCalledWith(
+				'[deleteRagFile] Error deleting document from RAG API:',
+				'Server Error',
+			);
+		});
+	});
+
+	describe('when file is not embedded', () => {
+		it('should skip RAG deletion and return true', async () => {
+			const file = { file_id: 'file-123', embedded: false };
+
+			const result = await deleteRagFile({ userId: 'user123', file });
+
+			expect(result).toBe(true);
+			expect(mockedAxios.delete).not.toHaveBeenCalled();
+			expect(mockedGenerateShortLivedToken).not.toHaveBeenCalled();
+		});
+
+		it('should skip RAG deletion when embedded is undefined', async () => {
+			const file = { file_id: 'file-123' };
+
+			const result = await deleteRagFile({ userId: 'user123', file });
+
+			expect(result).toBe(true);
+			expect(mockedAxios.delete).not.toHaveBeenCalled();
+		});
+	});
+
+	describe('when RAG_API_URL is not configured', () => {
+		it('should skip RAG deletion and return true', async () => {
+			delete process.env.RAG_API_URL;
+			const file = { file_id: 'file-123', embedded: true };
+
+			const result = await deleteRagFile({ userId: 'user123', file });
+
+			expect(result).toBe(true);
+			expect(mockedAxios.delete).not.toHaveBeenCalled();
+		});
+	});
+
+	describe('userId handling', () => {
+		it('should return false when no userId is provided', async () => {
+			const file = { file_id: 'file-123', embedded: true };
+
+			const result = await deleteRagFile({ userId: '', file });
+
+			expect(result).toBe(false);
+			expect(mockedLogger.error).toHaveBeenCalledWith('[deleteRagFile] No user ID provided');
+			expect(mockedAxios.delete).not.toHaveBeenCalled();
+		});
+
+		it('should return false when userId is undefined', async () => {
+			const file = { file_id: 'file-123', embedded: true };
+
+			const result = await deleteRagFile({ userId: undefined as unknown as string, file });
+
+			expect(result).toBe(false);
+			expect(mockedLogger.error).toHaveBeenCalledWith('[deleteRagFile] No user ID provided');
+		});
+	});
+});
diff --git a/packages/api/src/files/rag.ts b/packages/api/src/files/rag.ts
new file mode 100644
index 0000000000..7155f62c12
--- /dev/null
+++ b/packages/api/src/files/rag.ts
@@ -0,0 +1,60 @@
+import axios from 'axios';
+import { logger } from '@librechat/data-schemas';
+import { generateShortLivedToken } from '~/crypto/jwt';
+
+interface DeleteRagFileParams {
+	/** The user ID. Required for authentication. If not provided, the function returns false and logs an error. */
+	userId: string;
+	/** The file object. Must have `embedded` and `file_id` properties. */
+	file: {
+		file_id: string;
+		embedded?: boolean;
+	};
+}
+
+/**
+ * Deletes embedded document(s) from the RAG API.
+ * This is a shared utility function used by all file storage strategies
+ * (S3, Azure, Firebase, Local) to delete RAG embeddings when a file is deleted.
+ *
+ * @param params - The parameters object.
+ * @param params.userId - The user ID for authentication.
+ * @param params.file - The file object. Must have `embedded` and `file_id` properties.
+ * @returns Returns true if deletion was successful or skipped, false if there was an error.
+ */
+export async function deleteRagFile({ userId, file }: DeleteRagFileParams): Promise<boolean> {
+	if (!file.embedded || !process.env.RAG_API_URL) {
+		return true;
+	}
+
+	if (!userId) {
+		logger.error('[deleteRagFile] No user ID provided');
+		return false;
+	}
+
+	const jwtToken = generateShortLivedToken(userId);
+
+	try {
+		await axios.delete(`${process.env.RAG_API_URL}/documents`, {
+			headers: {
+				Authorization: `Bearer ${jwtToken}`,
+				'Content-Type': 'application/json',
+				accept: 'application/json',
+			},
+			data: [file.file_id],
+		});
+		logger.debug(`[deleteRagFile] Successfully deleted document ${file.file_id} from RAG API`);
+		return true;
+	} catch (error) {
+		const axiosError = error as { response?: { status?: number }; message?: string };
+		if (axiosError.response?.status === 404) {
+			logger.warn(
+				`[deleteRagFile] Document ${file.file_id} not found in RAG API, may have been deleted already`,
+			);
+			return true;
+		} else {
+			logger.error('[deleteRagFile] Error deleting document from RAG API:', axiosError.message);
+			return false;
+		}
+	}
+}
diff --git a/packages/api/src/index.ts b/packages/api/src/index.ts
index 492b59f232..fefdafaefd 100644
--- a/packages/api/src/index.ts
+++ b/packages/api/src/index.ts
@@ -2,6 +2,8 @@ export * from './app';
 export * from './cdn';
 /* Auth */
 export * from './auth';
+/* API Keys */
+export * from './apiKeys';
 /* MCP */
 export * from './mcp/registry/MCPServersRegistry';
 export * from './mcp/MCPManager';
diff --git a/packages/api/src/mcp/ConnectionsRepository.ts b/packages/api/src/mcp/ConnectionsRepository.ts
index e2c48c88ab..b14af57b29 100644
--- a/packages/api/src/mcp/ConnectionsRepository.ts
+++ b/packages/api/src/mcp/ConnectionsRepository.ts
@@ -4,6 +4,8 @@ import { MCPConnection } from './connection';
 import { MCPServersRegistry } from '~/mcp/registry/MCPServersRegistry';
 import type * as t from './types';
 
+const CONNECT_CONCURRENCY = 3;
+
 /**
  * Manages MCP connections with lazy loading and reconnection.
  * Maintains a pool of connections and handles connection lifecycle management.
@@ -73,6 +75,7 @@ export class ConnectionsRepository {
       {
         serverName,
         serverConfig,
+        useSSRFProtection: MCPServersRegistry.getInstance().shouldEnableSSRFProtection(),
       },
       this.oauthOpts,
     );
@@ -83,9 +86,17 @@ export class ConnectionsRepository {
 
   /** Gets or creates connections for multiple servers concurrently */
   async getMany(serverNames: string[]): Promise<Map<string, MCPConnection>> {
-    const connectionPromises = serverNames.map(async (name) => [name, await this.get(name)]);
-    const connections = await Promise.all(connectionPromises);
-    return new Map((connections as [string, MCPConnection][]).filter((v) => !!v[1]));
+    const results: [string, MCPConnection | null][] = [];
+    for (let i = 0; i < serverNames.length; i += CONNECT_CONCURRENCY) {
+      const batch = serverNames.slice(i, i + CONNECT_CONCURRENCY);
+      const batchResults = await Promise.all(
+        batch.map(
+          async (name): Promise<[string, MCPConnection | null]> => [name, await this.get(name)],
+        ),
+      );
+      results.push(...batchResults);
+    }
+    return new Map(results.filter((v): v is [string, MCPConnection] => v[1] != null));
   }
 
   /** Returns all currently loaded connections without creating new ones */
diff --git a/packages/api/src/mcp/MCPConnectionFactory.ts b/packages/api/src/mcp/MCPConnectionFactory.ts
index 1a97755ec3..a8f631614d 100644
--- a/packages/api/src/mcp/MCPConnectionFactory.ts
+++ b/packages/api/src/mcp/MCPConnectionFactory.ts
@@ -1,5 +1,6 @@
 import { logger } from '@librechat/data-schemas';
 import type { OAuthClientInformation } from '@modelcontextprotocol/sdk/shared/auth.js';
+import type { Tool } from '@modelcontextprotocol/sdk/types.js';
 import type { TokenMethods } from '@librechat/data-schemas';
 import type { MCPOAuthTokens, OAuthMetadata } from '~/mcp/oauth';
 import type { FlowStateManager } from '~/flow/manager';
@@ -11,6 +12,13 @@ import { withTimeout } from '~/utils/promise';
 import { MCPConnection } from './connection';
 import { processMCPEnv } from '~/utils';
 
+export interface ToolDiscoveryResult {
+  tools: Tool[] | null;
+  connection: MCPConnection | null;
+  oauthRequired: boolean;
+  oauthUrl: string | null;
+}
+
 /**
  * Factory for creating MCP connections with optional OAuth authentication.
  * Handles OAuth flows, token management, and connection retry logic.
@@ -21,6 +29,7 @@ export class MCPConnectionFactory {
   protected readonly serverConfig: t.MCPOptions;
   protected readonly logPrefix: string;
   protected readonly useOAuth: boolean;
+  protected readonly useSSRFProtection: boolean;
 
   // OAuth-related properties (only set when useOAuth is true)
   protected readonly userId?: string;
@@ -41,6 +50,139 @@ export class MCPConnectionFactory {
     return factory.createConnection();
   }
 
+  /**
+   * Discovers tools from an MCP server, even when OAuth is required.
+   * Per MCP spec, tool listing should be possible without authentication.
+   * Returns tools if discoverable, plus OAuth status for tool execution.
+   */
+  static async discoverTools(
+    basic: t.BasicConnectionOptions,
+    oauth?: Omit<t.OAuthConnectionOptions, 'returnOnOAuth'>,
+  ): Promise<ToolDiscoveryResult> {
+    const factory = new this(basic, oauth ? { ...oauth, returnOnOAuth: true } : undefined);
+    return factory.discoverToolsInternal();
+  }
+
+  protected async discoverToolsInternal(): Promise<ToolDiscoveryResult> {
+    const oauthUrl: string | null = null;
+    let oauthRequired = false;
+
+    const oauthTokens = this.useOAuth ? await this.getOAuthTokens() : null;
+    const connection = new MCPConnection({
+      serverName: this.serverName,
+      serverConfig: this.serverConfig,
+      userId: this.userId,
+      oauthTokens,
+      useSSRFProtection: this.useSSRFProtection,
+    });
+
+    const oauthHandler = async () => {
+      logger.info(
+        `${this.logPrefix} [Discovery] OAuth required; skipping URL generation in discovery mode`,
+      );
+      oauthRequired = true;
+      connection.emit('oauthFailed', new Error('OAuth required during tool discovery'));
+    };
+
+    if (this.useOAuth) {
+      connection.on('oauthRequired', oauthHandler);
+    }
+
+    try {
+      const connectTimeout = this.connectionTimeout ?? this.serverConfig.initTimeout ?? 30000;
+      await withTimeout(
+        connection.connect(),
+        connectTimeout,
+        `Connection timeout after ${connectTimeout}ms`,
+      );
+
+      if (await connection.isConnected()) {
+        const tools = await connection.fetchTools();
+        if (this.useOAuth) {
+          connection.removeListener('oauthRequired', oauthHandler);
+        }
+        return { tools, connection, oauthRequired: false, oauthUrl: null };
+      }
+    } catch {
+      logger.debug(
+        `${this.logPrefix} [Discovery] Connection failed, attempting unauthenticated tool listing`,
+      );
+    }
+
+    try {
+      const tools = await this.attemptUnauthenticatedToolListing();
+      if (this.useOAuth) {
+        connection.removeListener('oauthRequired', oauthHandler);
+      }
+      if (tools && tools.length > 0) {
+        logger.info(
+          `${this.logPrefix} [Discovery] Successfully discovered ${tools.length} tools without auth`,
+        );
+        try {
+          await connection.disconnect();
+        } catch {
+          // Ignore cleanup errors
+        }
+        return { tools, connection: null, oauthRequired, oauthUrl };
+      }
+    } catch (listError) {
+      logger.debug(`${this.logPrefix} [Discovery] Unauthenticated tool listing failed:`, listError);
+    }
+
+    if (this.useOAuth) {
+      connection.removeListener('oauthRequired', oauthHandler);
+    }
+
+    try {
+      await connection.disconnect();
+    } catch {
+      // Ignore cleanup errors
+    }
+
+    return { tools: null, connection: null, oauthRequired, oauthUrl };
+  }
+
+  protected async attemptUnauthenticatedToolListing(): Promise<Tool[] | null> {
+    const unauthConnection = new MCPConnection({
+      serverName: this.serverName,
+      serverConfig: this.serverConfig,
+      userId: this.userId,
+      oauthTokens: null,
+      useSSRFProtection: this.useSSRFProtection,
+    });
+
+    unauthConnection.on('oauthRequired', () => {
+      logger.debug(
+        `${this.logPrefix} [Discovery] Unauthenticated connection requires OAuth, failing fast`,
+      );
+      unauthConnection.emit(
+        'oauthFailed',
+        new Error('OAuth not supported in unauthenticated discovery'),
+      );
+    });
+
+    try {
+      const connectTimeout = this.connectionTimeout ?? this.serverConfig.initTimeout ?? 15000;
+      await withTimeout(unauthConnection.connect(), connectTimeout, `Unauth connection timeout`);
+
+      if (await unauthConnection.isConnected()) {
+        const tools = await unauthConnection.fetchTools();
+        await unauthConnection.disconnect();
+        return tools;
+      }
+    } catch {
+      logger.debug(`${this.logPrefix} [Discovery] Unauthenticated connection attempt failed`);
+    }
+
+    try {
+      await unauthConnection.disconnect();
+    } catch {
+      // Ignore cleanup errors
+    }
+
+    return null;
+  }
+
   protected constructor(basic: t.BasicConnectionOptions, oauth?: t.OAuthConnectionOptions) {
     this.serverConfig = processMCPEnv({
       options: basic.serverConfig,
@@ -50,13 +192,14 @@ export class MCPConnectionFactory {
     });
     this.serverName = basic.serverName;
     this.useOAuth = !!oauth?.useOAuth;
+    this.useSSRFProtection = basic.useSSRFProtection === true;
     this.connectionTimeout = oauth?.connectionTimeout;
     this.logPrefix = oauth?.user
       ? `[MCP][${basic.serverName}][${oauth.user.id}]`
       : `[MCP][${basic.serverName}]`;
 
     if (oauth?.useOAuth) {
-      this.userId = oauth.user.id;
+      this.userId = oauth.user?.id;
       this.flowManager = oauth.flowManager;
       this.tokenMethods = oauth.tokenMethods;
       this.signal = oauth.signal;
@@ -74,6 +217,7 @@ export class MCPConnectionFactory {
       serverConfig: this.serverConfig,
       userId: this.userId,
       oauthTokens,
+      useSSRFProtection: this.useSSRFProtection,
     });
 
     let cleanupOAuthHandlers: (() => void) | null = null;
@@ -154,38 +298,45 @@ export class MCPConnectionFactory {
     const oauthHandler = async (data: { serverUrl?: string }) => {
       logger.info(`${this.logPrefix} oauthRequired event received`);
 
-      // If we just want to initiate OAuth and return, handle it differently
       if (this.returnOnOAuth) {
         try {
           const config = this.serverConfig;
-          const { authorizationUrl, flowId, flowMetadata } =
-            await MCPOAuthHandler.initiateOAuthFlow(
-              this.serverName,
-              data.serverUrl || '',
-              this.userId!,
-              config?.oauth_headers ?? {},
-              config?.oauth,
+          const flowId = MCPOAuthHandler.generateFlowId(this.userId!, this.serverName);
+          const existingFlow = await this.flowManager!.getFlowState(flowId, 'mcp_oauth');
+
+          if (existingFlow?.status === 'PENDING') {
+            logger.debug(
+              `${this.logPrefix} PENDING OAuth flow already exists, skipping new initiation`,
             );
+            connection.emit('oauthFailed', new Error('OAuth flow initiated - return early'));
+            return;
+          }
 
-          // Delete any existing flow state to ensure we start fresh
-          // This prevents stale codeVerifier issues when re-authenticating
-          await this.flowManager!.deleteFlow(flowId, 'mcp_oauth');
+          const {
+            authorizationUrl,
+            flowId: newFlowId,
+            flowMetadata,
+          } = await MCPOAuthHandler.initiateOAuthFlow(
+            this.serverName,
+            data.serverUrl || '',
+            this.userId!,
+            config?.oauth_headers ?? {},
+            config?.oauth,
+          );
 
-          // Create the flow state so the OAuth callback can find it
-          // We spawn this in the background without waiting for it
-          // Pass signal so the flow can be aborted if the request is cancelled
-          this.flowManager!.createFlow(flowId, 'mcp_oauth', flowMetadata, this.signal).catch(() => {
-            // The OAuth callback will resolve this flow, so we expect it to timeout here
-            // or it will be aborted if the request is cancelled - both are fine
-          });
+          if (existingFlow) {
+            await this.flowManager!.deleteFlow(newFlowId, 'mcp_oauth');
+          }
+
+          this.flowManager!.createFlow(newFlowId, 'mcp_oauth', flowMetadata, this.signal).catch(
+            () => {},
+          );
 
           if (this.oauthStart) {
             logger.info(`${this.logPrefix} OAuth flow started, issuing authorization URL`);
             await this.oauthStart(authorizationUrl);
           }
 
-          // Emit oauthFailed to signal that connection should not proceed
-          // but OAuth was successfully initiated
           connection.emit('oauthFailed', new Error('OAuth flow initiated - return early'));
           return;
         } catch (error) {
@@ -247,11 +398,9 @@ export class MCPConnectionFactory {
     logger.error(`${this.logPrefix} Failed to establish connection.`);
   }
 
-  // Handles connection attempts with retry logic and OAuth error handling
   private async connectTo(connection: MCPConnection): Promise<void> {
     const maxAttempts = 3;
     let attempts = 0;
-    let oauthHandled = false;
 
     while (attempts < maxAttempts) {
       try {
@@ -264,22 +413,6 @@ export class MCPConnectionFactory {
         attempts++;
 
         if (this.useOAuth && this.isOAuthError(error)) {
-          // For returnOnOAuth mode, let the event handler (handleOAuthEvents) deal with OAuth
-          // We just need to stop retrying and let the error propagate
-          if (this.returnOnOAuth) {
-            logger.info(
-              `${this.logPrefix} OAuth required (return on OAuth mode), stopping retries`,
-            );
-            throw error;
-          }
-
-          // Normal flow - wait for OAuth to complete
-          if (this.oauthStart && !oauthHandled) {
-            oauthHandled = true;
-            logger.info(`${this.logPrefix} Handling OAuth`);
-            await this.handleOAuthRequired();
-          }
-          // Don't retry on OAuth errors - just throw
           logger.info(`${this.logPrefix} OAuth required, stopping connection attempts`);
           throw error;
         }
@@ -355,26 +488,15 @@ export class MCPConnectionFactory {
       /** Check if there's already an ongoing OAuth flow for this flowId */
       const existingFlow = await this.flowManager.getFlowState(flowId, 'mcp_oauth');
 
-      // If any flow exists (PENDING, COMPLETED, FAILED), cancel it and start fresh
-      // This ensures the user always gets a new OAuth URL instead of waiting for stale flows
       if (existingFlow) {
         logger.debug(
-          `${this.logPrefix} Found existing OAuth flow (status: ${existingFlow.status}), cancelling to start fresh`,
+          `${this.logPrefix} Found existing OAuth flow (status: ${existingFlow.status}), cleaning up to start fresh`,
         );
         try {
-          if (existingFlow.status === 'PENDING') {
-            await this.flowManager.failFlow(
-              flowId,
-              'mcp_oauth',
-              new Error('Cancelled for new OAuth request'),
-            );
-          } else {
-            await this.flowManager.deleteFlow(flowId, 'mcp_oauth');
-          }
+          await this.flowManager.deleteFlow(flowId, 'mcp_oauth');
         } catch (error) {
-          logger.warn(`${this.logPrefix} Failed to cancel existing OAuth flow`, error);
+          logger.warn(`${this.logPrefix} Failed to clean up existing OAuth flow`, error);
         }
-        // Continue to start a new flow below
       }
 
       logger.debug(`${this.logPrefix} Initiating new OAuth flow for ${this.serverName}...`);
diff --git a/packages/api/src/mcp/MCPManager.ts b/packages/api/src/mcp/MCPManager.ts
index fbd5bd050d..cab495774a 100644
--- a/packages/api/src/mcp/MCPManager.ts
+++ b/packages/api/src/mcp/MCPManager.ts
@@ -3,15 +3,18 @@ import { logger } from '@librechat/data-schemas';
 import { CallToolResultSchema, ErrorCode, McpError } from '@modelcontextprotocol/sdk/types.js';
 import type { RequestOptions } from '@modelcontextprotocol/sdk/shared/protocol.js';
 import type { TokenMethods, IUser } from '@librechat/data-schemas';
+import type { GraphTokenResolver } from '~/utils/graph';
 import type { FlowStateManager } from '~/flow/manager';
 import type { MCPOAuthTokens } from './oauth';
 import type { RequestBody } from '~/types';
 import type * as t from './types';
+import { MCPServersInitializer } from './registry/MCPServersInitializer';
+import { MCPServerInspector } from './registry/MCPServerInspector';
+import { MCPServersRegistry } from './registry/MCPServersRegistry';
 import { UserConnectionManager } from './UserConnectionManager';
 import { ConnectionsRepository } from './ConnectionsRepository';
-import { MCPServerInspector } from './registry/MCPServerInspector';
-import { MCPServersInitializer } from './registry/MCPServersInitializer';
-import { MCPServersRegistry } from './registry/MCPServersRegistry';
+import { MCPConnectionFactory } from './MCPConnectionFactory';
+import { preProcessGraphTokens } from '~/utils/graph';
 import { formatToolContent } from './parsers';
 import { MCPConnection } from './connection';
 import { processMCPEnv } from '~/utils/env';
@@ -66,6 +69,71 @@ export class MCPManager extends UserConnectionManager {
     }
   }
 
+  /**
+   * Discovers tools from an MCP server, even when OAuth is required.
+   * Per MCP spec, tool listing should be possible without authentication.
+   * Use this for agent initialization to get tool schemas before OAuth flow.
+   */
+  public async discoverServerTools(args: t.ToolDiscoveryOptions): Promise<t.ToolDiscoveryResult> {
+    const { serverName, user } = args;
+    const logPrefix = user?.id ? `[MCP][User: ${user.id}][${serverName}]` : `[MCP][${serverName}]`;
+
+    try {
+      const existingAppConnection = await this.appConnections?.get(serverName);
+      if (existingAppConnection && (await existingAppConnection.isConnected())) {
+        const tools = await existingAppConnection.fetchTools();
+        return { tools, oauthRequired: false, oauthUrl: null };
+      }
+    } catch {
+      logger.debug(`${logPrefix} [Discovery] App connection not available, trying discovery mode`);
+    }
+
+    const serverConfig = (await MCPServersRegistry.getInstance().getServerConfig(
+      serverName,
+      user?.id,
+    )) as t.MCPOptions | null;
+
+    if (!serverConfig) {
+      logger.warn(`${logPrefix} [Discovery] Server config not found`);
+      return { tools: null, oauthRequired: false, oauthUrl: null };
+    }
+
+    const useOAuth = Boolean(
+      serverConfig.requiresOAuth || (serverConfig as t.ParsedServerConfig).oauthMetadata,
+    );
+
+    const useSSRFProtection = MCPServersRegistry.getInstance().shouldEnableSSRFProtection();
+    const basic: t.BasicConnectionOptions = { serverName, serverConfig, useSSRFProtection };
+
+    if (!useOAuth) {
+      const result = await MCPConnectionFactory.discoverTools(basic);
+      return {
+        tools: result.tools,
+        oauthRequired: result.oauthRequired,
+        oauthUrl: result.oauthUrl,
+      };
+    }
+
+    if (!user || !args.flowManager) {
+      logger.warn(`${logPrefix} [Discovery] OAuth server requires user and flowManager`);
+      return { tools: null, oauthRequired: true, oauthUrl: null };
+    }
+
+    const result = await MCPConnectionFactory.discoverTools(basic, {
+      user,
+      useOAuth: true,
+      flowManager: args.flowManager,
+      tokenMethods: args.tokenMethods,
+      signal: args.signal,
+      oauthStart: args.oauthStart,
+      customUserVars: args.customUserVars,
+      requestBody: args.requestBody,
+      connectionTimeout: args.connectionTimeout,
+    });
+
+    return { tools: result.tools, oauthRequired: result.oauthRequired, oauthUrl: result.oauthUrl };
+  }
+
   /** Returns all available tool functions from app-level connections */
   public async getAppToolFunctions(): Promise<t.LCAvailableTools> {
     const toolFunctions: t.LCAvailableTools = {};
@@ -160,6 +228,10 @@ Please follow these instructions when using tools from the respective MCP server
    * Calls a tool on an MCP server, using either a user-specific connection
    * (if userId is provided) or an app-level connection. Updates the last activity timestamp
    * for user-specific connections upon successful call initiation.
+   *
+   * @param graphTokenResolver - Optional function to resolve Graph API tokens via OBO flow.
+   *   When provided and the server config contains `{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}` placeholders,
+   *   they will be resolved to actual Graph API tokens before the tool call.
    */
   async callTool({
     user,
@@ -174,6 +246,7 @@ Please follow these instructions when using tools from the respective MCP server
     oauthStart,
     oauthEnd,
     customUserVars,
+    graphTokenResolver,
   }: {
     user?: IUser;
     serverName: string;
@@ -187,6 +260,7 @@ Please follow these instructions when using tools from the respective MCP server
     flowManager: FlowStateManager<MCPOAuthTokens | null>;
     oauthStart?: (authURL: string) => Promise<void>;
     oauthEnd?: () => Promise<void>;
+    graphTokenResolver?: GraphTokenResolver;
   }): Promise<t.FormattedToolResponse> {
     /** User-specific connection */
     let connection: MCPConnection | undefined;
@@ -220,9 +294,16 @@ Please follow these instructions when using tools from the respective MCP server
         serverName,
         userId,
       )) as t.MCPOptions;
+
+      // Pre-process Graph token placeholders (async) before sync processMCPEnv
+      const graphProcessedConfig = await preProcessGraphTokens(rawConfig, {
+        user,
+        graphTokenResolver,
+        scopes: process.env.GRAPH_API_SCOPES,
+      });
       const currentOptions = processMCPEnv({
         user,
-        options: rawConfig,
+        options: graphProcessedConfig,
         customUserVars: customUserVars,
         body: requestBody,
       });
diff --git a/packages/api/src/mcp/UserConnectionManager.ts b/packages/api/src/mcp/UserConnectionManager.ts
index 1b85b69eac..e5d94689a0 100644
--- a/packages/api/src/mcp/UserConnectionManager.ts
+++ b/packages/api/src/mcp/UserConnectionManager.ts
@@ -49,7 +49,7 @@ export abstract class UserConnectionManager {
     serverName: string;
     forceNew?: boolean;
   } & Omit<t.OAuthConnectionOptions, 'useOAuth'>): Promise<MCPConnection> {
-    const userId = user.id;
+    const userId = user?.id;
     if (!userId) {
       throw new McpError(ErrorCode.InvalidRequest, `[MCP] User object missing id property`);
     }
@@ -117,6 +117,7 @@ export abstract class UserConnectionManager {
         {
           serverName: serverName,
           serverConfig: config,
+          useSSRFProtection: MCPServersRegistry.getInstance().shouldEnableSSRFProtection(),
         },
         {
           useOAuth: true,
diff --git a/packages/api/src/mcp/__tests__/ConnectionsRepository.test.ts b/packages/api/src/mcp/__tests__/ConnectionsRepository.test.ts
index e722b38375..4240ba12d6 100644
--- a/packages/api/src/mcp/__tests__/ConnectionsRepository.test.ts
+++ b/packages/api/src/mcp/__tests__/ConnectionsRepository.test.ts
@@ -24,6 +24,7 @@ jest.mock('../connection');
 const mockRegistryInstance = {
   getServerConfig: jest.fn(),
   getAllServerConfigs: jest.fn(),
+  shouldEnableSSRFProtection: jest.fn().mockReturnValue(false),
 };
 
 jest.mock('../registry/MCPServersRegistry', () => ({
@@ -108,6 +109,7 @@ describe('ConnectionsRepository', () => {
         {
           serverName: 'server1',
           serverConfig: mockServerConfigs.server1,
+          useSSRFProtection: false,
         },
         undefined,
       );
@@ -129,6 +131,7 @@ describe('ConnectionsRepository', () => {
         {
           serverName: 'server1',
           serverConfig: mockServerConfigs.server1,
+          useSSRFProtection: false,
         },
         undefined,
       );
@@ -167,6 +170,7 @@ describe('ConnectionsRepository', () => {
         {
           serverName: 'server1',
           serverConfig: configWithCachedAt,
+          useSSRFProtection: false,
         },
         undefined,
       );
diff --git a/packages/api/src/mcp/__tests__/MCPConnectionFactory.test.ts b/packages/api/src/mcp/__tests__/MCPConnectionFactory.test.ts
index 528e635204..263c84357a 100644
--- a/packages/api/src/mcp/__tests__/MCPConnectionFactory.test.ts
+++ b/packages/api/src/mcp/__tests__/MCPConnectionFactory.test.ts
@@ -1,6 +1,5 @@
 import { logger } from '@librechat/data-schemas';
-import type { TokenMethods } from '@librechat/data-schemas';
-import type { TUser } from 'librechat-data-provider';
+import type { TokenMethods, IUser } from '@librechat/data-schemas';
 import type { FlowStateManager } from '~/flow/manager';
 import type { MCPOAuthTokens } from '~/mcp/oauth';
 import type * as t from '~/mcp/types';
@@ -27,7 +26,7 @@ const mockMCPConnection = MCPConnection as jest.MockedClass<typeof MCPConnection
 const mockMCPOAuthHandler = MCPOAuthHandler as jest.Mocked<typeof MCPOAuthHandler>;
 
 describe('MCPConnectionFactory', () => {
-  let mockUser: TUser;
+  let mockUser: IUser | undefined;
   let mockServerConfig: t.MCPOptions;
   let mockFlowManager: jest.Mocked<FlowStateManager<MCPOAuthTokens | null>>;
   let mockConnectionInstance: jest.Mocked<MCPConnection>;
@@ -37,7 +36,7 @@ describe('MCPConnectionFactory', () => {
     mockUser = {
       id: 'user123',
       email: 'test@example.com',
-    } as TUser;
+    } as IUser;
 
     mockServerConfig = {
       command: 'node',
@@ -85,6 +84,7 @@ describe('MCPConnectionFactory', () => {
         serverConfig: mockServerConfig,
         userId: undefined,
         oauthTokens: null,
+        useSSRFProtection: false,
       });
       expect(mockConnectionInstance.connect).toHaveBeenCalled();
     });
@@ -126,6 +126,7 @@ describe('MCPConnectionFactory', () => {
         serverConfig: mockServerConfig,
         userId: 'user123',
         oauthTokens: mockTokens,
+        useSSRFProtection: false,
       });
     });
   });
@@ -185,6 +186,7 @@ describe('MCPConnectionFactory', () => {
         serverConfig: mockServerConfig,
         userId: 'user123',
         oauthTokens: null,
+        useSSRFProtection: false,
       });
       expect(mockLogger.debug).toHaveBeenCalledWith(
         expect.stringContaining('No existing tokens found or error loading tokens'),
@@ -268,14 +270,61 @@ describe('MCPConnectionFactory', () => {
       );
     });
 
-    it('should delete existing flow before creating new OAuth flow to prevent stale codeVerifier', async () => {
+    it('should skip new OAuth flow initiation when a PENDING flow already exists (returnOnOAuth)', async () => {
       const basicOptions = {
         serverName: 'test-server',
         serverConfig: mockServerConfig,
         user: mockUser,
       };
 
-      const oauthOptions = {
+      const oauthOptions: t.OAuthConnectionOptions = {
+        user: mockUser,
+        useOAuth: true,
+        returnOnOAuth: true,
+        oauthStart: jest.fn(),
+        flowManager: mockFlowManager,
+      };
+
+      mockFlowManager.getFlowState.mockResolvedValue({
+        status: 'PENDING',
+        type: 'mcp_oauth',
+        metadata: { codeVerifier: 'existing-verifier' },
+        createdAt: Date.now(),
+      });
+      mockConnectionInstance.isConnected.mockResolvedValue(false);
+
+      let oauthRequiredHandler: (data: Record<string, unknown>) => Promise<void>;
+      mockConnectionInstance.on.mockImplementation((event, handler) => {
+        if (event === 'oauthRequired') {
+          oauthRequiredHandler = handler as (data: Record<string, unknown>) => Promise<void>;
+        }
+        return mockConnectionInstance;
+      });
+
+      try {
+        await MCPConnectionFactory.create(basicOptions, oauthOptions);
+      } catch {
+        // Expected to fail
+      }
+
+      await oauthRequiredHandler!({ serverUrl: 'https://api.example.com' });
+
+      expect(mockMCPOAuthHandler.initiateOAuthFlow).not.toHaveBeenCalled();
+      expect(mockFlowManager.deleteFlow).not.toHaveBeenCalled();
+      expect(mockConnectionInstance.emit).toHaveBeenCalledWith(
+        'oauthFailed',
+        expect.objectContaining({ message: 'OAuth flow initiated - return early' }),
+      );
+    });
+
+    it('should delete stale flow and create new OAuth flow when existing flow is COMPLETED', async () => {
+      const basicOptions = {
+        serverName: 'test-server',
+        serverConfig: mockServerConfig,
+        user: mockUser,
+      };
+
+      const oauthOptions: t.OAuthConnectionOptions = {
         user: mockUser,
         useOAuth: true,
         returnOnOAuth: true,
@@ -301,6 +350,12 @@ describe('MCPConnectionFactory', () => {
         },
       };
 
+      mockFlowManager.getFlowState.mockResolvedValue({
+        status: 'COMPLETED',
+        type: 'mcp_oauth',
+        metadata: { codeVerifier: 'old-verifier' },
+        createdAt: Date.now() - 60000,
+      });
       mockMCPOAuthHandler.initiateOAuthFlow.mockResolvedValue(mockFlowData);
       mockFlowManager.deleteFlow.mockResolvedValue(true);
       mockFlowManager.createFlow.mockRejectedValue(new Error('Timeout expected'));
@@ -317,21 +372,17 @@ describe('MCPConnectionFactory', () => {
       try {
         await MCPConnectionFactory.create(basicOptions, oauthOptions);
       } catch {
-        // Expected to fail due to connection not established
+        // Expected to fail
       }
 
       await oauthRequiredHandler!({ serverUrl: 'https://api.example.com' });
 
-      // Verify deleteFlow was called with correct parameters
       expect(mockFlowManager.deleteFlow).toHaveBeenCalledWith('user123:test-server', 'mcp_oauth');
 
-      // Verify deleteFlow was called before createFlow
       const deleteCallOrder = mockFlowManager.deleteFlow.mock.invocationCallOrder[0];
       const createCallOrder = mockFlowManager.createFlow.mock.invocationCallOrder[0];
       expect(deleteCallOrder).toBeLessThan(createCallOrder);
 
-      // Verify createFlow was called with fresh metadata
-      // 4th arg is the abort signal (undefined in this test since no signal was provided)
       expect(mockFlowManager.createFlow).toHaveBeenCalledWith(
         'user123:test-server',
         'mcp_oauth',
@@ -424,4 +475,116 @@ describe('MCPConnectionFactory', () => {
       );
     });
   });
+
+  describe('discoverTools static method', () => {
+    const mockTools = [
+      { name: 'tool1', description: 'First tool', inputSchema: { type: 'object' } },
+      { name: 'tool2', description: 'Second tool', inputSchema: { type: 'object' } },
+    ];
+
+    it('should discover tools from a successfully connected server', async () => {
+      const basicOptions = {
+        serverName: 'test-server',
+        serverConfig: mockServerConfig,
+      };
+
+      mockConnectionInstance.connect.mockResolvedValue(undefined);
+      mockConnectionInstance.isConnected.mockResolvedValue(true);
+      mockConnectionInstance.fetchTools = jest.fn().mockResolvedValue(mockTools);
+
+      const result = await MCPConnectionFactory.discoverTools(basicOptions);
+
+      expect(result.tools).toEqual(mockTools);
+      expect(result.oauthRequired).toBe(false);
+      expect(result.oauthUrl).toBeNull();
+      expect(result.connection).toBe(mockConnectionInstance);
+    });
+
+    it('should detect OAuth required without generating URL in discovery mode', async () => {
+      const basicOptions = {
+        serverName: 'test-server',
+        serverConfig: {
+          ...mockServerConfig,
+          url: 'https://api.example.com',
+          type: 'sse' as const,
+        } as t.SSEOptions,
+      };
+
+      const mockOAuthStart = jest.fn().mockResolvedValue(undefined);
+
+      const oauthOptions = {
+        useOAuth: true as const,
+        user: mockUser as unknown as IUser,
+        flowManager: mockFlowManager,
+        oauthStart: mockOAuthStart,
+        tokenMethods: {
+          findToken: jest.fn(),
+          createToken: jest.fn(),
+          updateToken: jest.fn(),
+          deleteTokens: jest.fn(),
+        },
+      };
+
+      mockConnectionInstance.isConnected.mockResolvedValue(false);
+      mockConnectionInstance.disconnect = jest.fn().mockResolvedValue(undefined);
+
+      let oauthHandler: (() => Promise<void>) | undefined;
+      mockConnectionInstance.on.mockImplementation((event, handler) => {
+        if (event === 'oauthRequired') {
+          oauthHandler = handler as () => Promise<void>;
+        }
+        return mockConnectionInstance;
+      });
+
+      mockConnectionInstance.connect.mockImplementation(async () => {
+        if (oauthHandler) {
+          await oauthHandler();
+        }
+        throw new Error('OAuth required');
+      });
+
+      const result = await MCPConnectionFactory.discoverTools(basicOptions, oauthOptions);
+
+      expect(result.connection).toBeNull();
+      expect(result.tools).toBeNull();
+      expect(result.oauthRequired).toBe(true);
+      expect(result.oauthUrl).toBeNull();
+      expect(mockOAuthStart).not.toHaveBeenCalled();
+    });
+
+    it('should return null tools when discovery fails completely', async () => {
+      const basicOptions = {
+        serverName: 'test-server',
+        serverConfig: mockServerConfig,
+      };
+
+      mockConnectionInstance.connect.mockRejectedValue(new Error('Connection failed'));
+      mockConnectionInstance.isConnected.mockResolvedValue(false);
+      mockConnectionInstance.disconnect = jest.fn().mockResolvedValue(undefined);
+
+      const result = await MCPConnectionFactory.discoverTools(basicOptions);
+
+      expect(result.tools).toBeNull();
+      expect(result.connection).toBeNull();
+      expect(result.oauthRequired).toBe(false);
+    });
+
+    it('should handle disconnect errors gracefully during cleanup', async () => {
+      const basicOptions = {
+        serverName: 'test-server',
+        serverConfig: mockServerConfig,
+      };
+
+      mockConnectionInstance.connect.mockRejectedValue(new Error('Connection failed'));
+      mockConnectionInstance.isConnected.mockResolvedValue(false);
+      mockConnectionInstance.disconnect = jest
+        .fn()
+        .mockRejectedValue(new Error('Disconnect failed'));
+
+      const result = await MCPConnectionFactory.discoverTools(basicOptions);
+
+      expect(result.tools).toBeNull();
+      expect(mockLogger.debug).toHaveBeenCalled();
+    });
+  });
 });
diff --git a/packages/api/src/mcp/__tests__/MCPManager.test.ts b/packages/api/src/mcp/__tests__/MCPManager.test.ts
index e75cd09b33..bf63a6af3c 100644
--- a/packages/api/src/mcp/__tests__/MCPManager.test.ts
+++ b/packages/api/src/mcp/__tests__/MCPManager.test.ts
@@ -1,10 +1,14 @@
 import { logger } from '@librechat/data-schemas';
+import type { IUser } from '@librechat/data-schemas';
+import type { GraphTokenResolver } from '~/utils/graph';
 import type * as t from '~/mcp/types';
-import { MCPManager } from '~/mcp/MCPManager';
 import { MCPServersInitializer } from '~/mcp/registry/MCPServersInitializer';
 import { MCPServerInspector } from '~/mcp/registry/MCPServerInspector';
+import { MCPConnectionFactory } from '~/mcp/MCPConnectionFactory';
 import { ConnectionsRepository } from '~/mcp/ConnectionsRepository';
-import { MCPConnection } from '../connection';
+import { MCPConnection } from '~/mcp/connection';
+import { MCPManager } from '~/mcp/MCPManager';
+import * as graphUtils from '~/utils/graph';
 
 // Mock external dependencies
 jest.mock('@librechat/data-schemas', () => ({
@@ -16,10 +20,20 @@ jest.mock('@librechat/data-schemas', () => ({
   },
 }));
 
+jest.mock('~/utils/graph', () => ({
+  ...jest.requireActual('~/utils/graph'),
+  preProcessGraphTokens: jest.fn(),
+}));
+
+jest.mock('~/utils/env', () => ({
+  processMCPEnv: jest.fn((params) => params.options),
+}));
+
 const mockRegistryInstance = {
   getServerConfig: jest.fn(),
   getAllServerConfigs: jest.fn(),
   getOAuthServers: jest.fn(),
+  shouldEnableSSRFProtection: jest.fn().mockReturnValue(false),
 };
 
 jest.mock('~/mcp/registry/MCPServersRegistry', () => ({
@@ -36,6 +50,7 @@ jest.mock('~/mcp/registry/MCPServersInitializer', () => ({
 
 jest.mock('~/mcp/registry/MCPServerInspector');
 jest.mock('~/mcp/ConnectionsRepository');
+jest.mock('~/mcp/MCPConnectionFactory');
 
 const mockLogger = logger as jest.Mocked<typeof logger>;
 
@@ -389,4 +404,525 @@ describe('MCPManager', () => {
       );
     });
   });
+
+  describe('callTool - Graph Token Integration', () => {
+    const mockUser: Partial<IUser> = {
+      id: 'user-123',
+      provider: 'openid',
+      openidId: 'oidc-sub-456',
+    };
+
+    const mockFlowManager = {
+      getState: jest.fn(),
+      setState: jest.fn(),
+      clearState: jest.fn(),
+    };
+
+    const mockConnection = {
+      isConnected: jest.fn().mockResolvedValue(true),
+      setRequestHeaders: jest.fn(),
+      timeout: 30000,
+      client: {
+        request: jest.fn().mockResolvedValue({
+          content: [{ type: 'text', text: 'Tool result' }],
+          isError: false,
+        }),
+      },
+    } as unknown as MCPConnection;
+
+    const mockGraphTokenResolver: GraphTokenResolver = jest.fn().mockResolvedValue({
+      access_token: 'resolved-graph-token',
+      token_type: 'Bearer',
+      expires_in: 3600,
+      scope: 'https://graph.microsoft.com/.default',
+    });
+
+    function createServerConfigWithGraphPlaceholder(): t.SSEOptions {
+      return {
+        type: 'sse',
+        url: 'https://api.example.com',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          'Content-Type': 'application/json',
+        },
+      };
+    }
+
+    beforeEach(() => {
+      jest.clearAllMocks();
+
+      // Mock preProcessGraphTokens to simulate token resolution
+      (graphUtils.preProcessGraphTokens as jest.Mock).mockImplementation(
+        async (options, graphOptions) => {
+          if (
+            options.headers?.Authorization?.includes('{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}') &&
+            graphOptions.graphTokenResolver
+          ) {
+            return {
+              ...options,
+              headers: {
+                ...options.headers,
+                Authorization: 'Bearer resolved-graph-token',
+              },
+            };
+          }
+          return options;
+        },
+      );
+    });
+
+    it('should call preProcessGraphTokens with graphTokenResolver when provided', async () => {
+      const serverConfig = createServerConfigWithGraphPlaceholder();
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      await manager.callTool({
+        user: mockUser as IUser,
+        serverName,
+        toolName: 'test_tool',
+        provider: 'openai',
+        flowManager: mockFlowManager as unknown as Parameters<
+          typeof manager.callTool
+        >[0]['flowManager'],
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      expect(graphUtils.preProcessGraphTokens).toHaveBeenCalledWith(
+        serverConfig,
+        expect.objectContaining({
+          user: mockUser,
+          graphTokenResolver: mockGraphTokenResolver,
+        }),
+      );
+    });
+
+    it('should resolve graph token placeholders in headers before tool call', async () => {
+      const serverConfig = createServerConfigWithGraphPlaceholder();
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      await manager.callTool({
+        user: mockUser as IUser,
+        serverName,
+        toolName: 'test_tool',
+        provider: 'openai',
+        flowManager: mockFlowManager as unknown as Parameters<
+          typeof manager.callTool
+        >[0]['flowManager'],
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      // Verify the connection received the resolved headers
+      expect(mockConnection.setRequestHeaders).toHaveBeenCalledWith(
+        expect.objectContaining({
+          Authorization: 'Bearer resolved-graph-token',
+        }),
+      );
+    });
+
+    it('should pass options unchanged when no graphTokenResolver is provided', async () => {
+      const serverConfig: t.SSEOptions = {
+        type: 'sse',
+        url: 'https://api.example.com',
+        headers: {
+          Authorization: 'Bearer static-token',
+        },
+      };
+
+      // Reset mock to return options unchanged
+      (graphUtils.preProcessGraphTokens as jest.Mock).mockImplementation(
+        async (options) => options,
+      );
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      await manager.callTool({
+        user: mockUser as IUser,
+        serverName,
+        toolName: 'test_tool',
+        provider: 'openai',
+        flowManager: mockFlowManager as unknown as Parameters<
+          typeof manager.callTool
+        >[0]['flowManager'],
+        // No graphTokenResolver provided
+      });
+
+      // Verify preProcessGraphTokens was still called (to check for placeholders)
+      expect(graphUtils.preProcessGraphTokens).toHaveBeenCalledWith(
+        serverConfig,
+        expect.objectContaining({
+          user: mockUser,
+          graphTokenResolver: undefined,
+        }),
+      );
+    });
+
+    it('should handle graph token resolution failure gracefully', async () => {
+      const serverConfig = createServerConfigWithGraphPlaceholder();
+
+      // Simulate resolution failure - returns original value unchanged
+      (graphUtils.preProcessGraphTokens as jest.Mock).mockImplementation(
+        async (options) => options,
+      );
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      // Should not throw, even when token resolution fails
+      await expect(
+        manager.callTool({
+          user: mockUser as IUser,
+          serverName,
+          toolName: 'test_tool',
+          provider: 'openai',
+          flowManager: mockFlowManager as unknown as Parameters<
+            typeof manager.callTool
+          >[0]['flowManager'],
+          graphTokenResolver: mockGraphTokenResolver,
+        }),
+      ).resolves.toBeDefined();
+
+      // Headers should contain the unresolved placeholder
+      expect(mockConnection.setRequestHeaders).toHaveBeenCalledWith(
+        expect.objectContaining({
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        }),
+      );
+    });
+
+    it('should resolve graph tokens in env variables', async () => {
+      const serverConfig: t.StdioOptions = {
+        type: 'stdio',
+        command: 'node',
+        args: ['server.js'],
+        env: {
+          GRAPH_TOKEN: '{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          OTHER_VAR: 'static-value',
+        },
+      };
+
+      // Mock resolution for env variables
+      (graphUtils.preProcessGraphTokens as jest.Mock).mockImplementation(async (options) => {
+        if (options.env?.GRAPH_TOKEN?.includes('{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}')) {
+          return {
+            ...options,
+            env: {
+              ...options.env,
+              GRAPH_TOKEN: 'resolved-graph-token',
+            },
+          };
+        }
+        return options;
+      });
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      await manager.callTool({
+        user: mockUser as IUser,
+        serverName,
+        toolName: 'test_tool',
+        provider: 'openai',
+        flowManager: mockFlowManager as unknown as Parameters<
+          typeof manager.callTool
+        >[0]['flowManager'],
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      expect(graphUtils.preProcessGraphTokens).toHaveBeenCalledWith(
+        serverConfig,
+        expect.objectContaining({
+          graphTokenResolver: mockGraphTokenResolver,
+        }),
+      );
+    });
+
+    it('should resolve graph tokens in URL', async () => {
+      const serverConfig: t.SSEOptions = {
+        type: 'sse',
+        url: 'https://api.example.com?token={{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+      };
+
+      // Mock resolution for URL
+      (graphUtils.preProcessGraphTokens as jest.Mock).mockImplementation(async (options) => {
+        if (options.url?.includes('{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}')) {
+          return {
+            ...options,
+            url: 'https://api.example.com?token=resolved-graph-token',
+          };
+        }
+        return options;
+      });
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      await manager.callTool({
+        user: mockUser as IUser,
+        serverName,
+        toolName: 'test_tool',
+        provider: 'openai',
+        flowManager: mockFlowManager as unknown as Parameters<
+          typeof manager.callTool
+        >[0]['flowManager'],
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      expect(graphUtils.preProcessGraphTokens).toHaveBeenCalledWith(
+        serverConfig,
+        expect.objectContaining({
+          graphTokenResolver: mockGraphTokenResolver,
+        }),
+      );
+    });
+
+    it('should pass scopes from environment variable to preProcessGraphTokens', async () => {
+      const originalEnv = process.env.GRAPH_API_SCOPES;
+      process.env.GRAPH_API_SCOPES = 'custom.scope.read custom.scope.write';
+
+      const serverConfig = createServerConfigWithGraphPlaceholder();
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      await manager.callTool({
+        user: mockUser as IUser,
+        serverName,
+        toolName: 'test_tool',
+        provider: 'openai',
+        flowManager: mockFlowManager as unknown as Parameters<
+          typeof manager.callTool
+        >[0]['flowManager'],
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      expect(graphUtils.preProcessGraphTokens).toHaveBeenCalledWith(
+        serverConfig,
+        expect.objectContaining({
+          scopes: 'custom.scope.read custom.scope.write',
+        }),
+      );
+
+      // Restore environment
+      if (originalEnv !== undefined) {
+        process.env.GRAPH_API_SCOPES = originalEnv;
+      } else {
+        delete process.env.GRAPH_API_SCOPES;
+      }
+    });
+
+    it('should work correctly when config has no graph token placeholders', async () => {
+      const serverConfig: t.SSEOptions = {
+        type: 'sse',
+        url: 'https://api.example.com',
+        headers: {
+          Authorization: 'Bearer static-token',
+        },
+      };
+
+      // Mock to return unchanged options when no placeholders
+      (graphUtils.preProcessGraphTokens as jest.Mock).mockImplementation(
+        async (options) => options,
+      );
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(serverConfig);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+
+      const result = await manager.callTool({
+        user: mockUser as IUser,
+        serverName,
+        toolName: 'test_tool',
+        provider: 'openai',
+        flowManager: mockFlowManager as unknown as Parameters<
+          typeof manager.callTool
+        >[0]['flowManager'],
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      expect(result).toBeDefined();
+      expect(mockConnection.setRequestHeaders).toHaveBeenCalledWith(
+        expect.objectContaining({
+          Authorization: 'Bearer static-token',
+        }),
+      );
+    });
+  });
+
+  describe('discoverServerTools', () => {
+    const mockTools = [
+      { name: 'tool1', description: 'First tool', inputSchema: { type: 'object' } },
+      { name: 'tool2', description: 'Second tool', inputSchema: { type: 'object' } },
+    ];
+
+    const mockConnection = {
+      isConnected: jest.fn().mockResolvedValue(true),
+      fetchTools: jest.fn().mockResolvedValue(mockTools),
+    } as unknown as MCPConnection;
+
+    beforeEach(() => {
+      (MCPConnectionFactory.discoverTools as jest.Mock) = jest.fn();
+    });
+
+    it('should return tools from existing app connection when available', async () => {
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(mockConnection),
+      });
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+      const result = await manager.discoverServerTools({ serverName });
+
+      expect(result.tools).toEqual(mockTools);
+      expect(result.oauthRequired).toBe(false);
+      expect(result.oauthUrl).toBeNull();
+      expect(MCPConnectionFactory.discoverTools).not.toHaveBeenCalled();
+    });
+
+    it('should use MCPConnectionFactory.discoverTools when no app connection available', async () => {
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(null),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue({
+        type: 'stdio',
+        command: 'test',
+        args: [],
+      });
+
+      (MCPConnectionFactory.discoverTools as jest.Mock).mockResolvedValue({
+        tools: mockTools,
+        connection: null,
+        oauthRequired: false,
+        oauthUrl: null,
+      });
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+      const result = await manager.discoverServerTools({ serverName });
+
+      expect(result.tools).toEqual(mockTools);
+      expect(result.oauthRequired).toBe(false);
+      expect(MCPConnectionFactory.discoverTools).toHaveBeenCalled();
+    });
+
+    it('should return null tools when server config not found', async () => {
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(null),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(null);
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+      const result = await manager.discoverServerTools({ serverName });
+
+      expect(result.tools).toBeNull();
+      expect(result.oauthRequired).toBe(false);
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        expect.stringContaining('Server config not found'),
+      );
+    });
+
+    it('should return OAuth info when server requires OAuth but no user provided', async () => {
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(null),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue({
+        type: 'sse',
+        url: 'https://api.example.com',
+        requiresOAuth: true,
+      });
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+      const result = await manager.discoverServerTools({ serverName });
+
+      expect(result.tools).toBeNull();
+      expect(result.oauthRequired).toBe(true);
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        expect.stringContaining('OAuth server requires user and flowManager'),
+      );
+    });
+
+    it('should discover tools with OAuth when user and flowManager provided', async () => {
+      const mockUser = { id: 'user123', email: 'test@example.com' } as unknown as IUser;
+      const mockFlowManager = {
+        createFlow: jest.fn(),
+        getFlowState: jest.fn(),
+        deleteFlow: jest.fn(),
+      };
+
+      mockAppConnections({
+        get: jest.fn().mockResolvedValue(null),
+      });
+
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue({
+        type: 'sse',
+        url: 'https://api.example.com',
+        requiresOAuth: true,
+      });
+
+      (MCPConnectionFactory.discoverTools as jest.Mock).mockResolvedValue({
+        tools: mockTools,
+        connection: null,
+        oauthRequired: true,
+        oauthUrl: 'https://auth.example.com/authorize',
+      });
+
+      const manager = await MCPManager.createInstance(newMCPServersConfig());
+      const result = await manager.discoverServerTools({
+        serverName,
+        user: mockUser,
+        flowManager: mockFlowManager as unknown as t.ToolDiscoveryOptions['flowManager'],
+      });
+
+      expect(result.tools).toEqual(mockTools);
+      expect(result.oauthRequired).toBe(true);
+      expect(result.oauthUrl).toBe('https://auth.example.com/authorize');
+      expect(MCPConnectionFactory.discoverTools).toHaveBeenCalledWith(
+        expect.objectContaining({ serverName }),
+        expect.objectContaining({ user: mockUser, useOAuth: true }),
+      );
+    });
+  });
 });
diff --git a/packages/api/src/mcp/__tests__/mcp.spec.ts b/packages/api/src/mcp/__tests__/mcp.spec.ts
index f33db2f5c1..d64f9f3afa 100644
--- a/packages/api/src/mcp/__tests__/mcp.spec.ts
+++ b/packages/api/src/mcp/__tests__/mcp.spec.ts
@@ -4,12 +4,23 @@ import {
   StreamableHTTPOptionsSchema,
 } from 'librechat-data-provider';
 import type { TUser } from 'librechat-data-provider';
+import type { IUser } from '@librechat/data-schemas';
+import type { GraphTokenResolver } from '~/utils/graph';
+import { preProcessGraphTokens } from '~/utils/graph';
 import { processMCPEnv } from '~/utils/env';
+import * as oidcUtils from '~/utils/oidc';
+
+// Mock oidc utilities for graph token tests
+jest.mock('~/utils/oidc', () => ({
+  ...jest.requireActual('~/utils/oidc'),
+  extractOpenIDTokenInfo: jest.fn(),
+  isOpenIDTokenValid: jest.fn(),
+}));
 
 // Helper function to create test user objects
 function createTestUser(
   overrides: Partial<TUser> & Record<string, unknown> = {},
-): TUser & Record<string, unknown> {
+): Omit<TUser, 'createdAt' | 'updatedAt'> | undefined {
   return {
     id: 'test-user-id',
     username: 'testuser',
@@ -18,8 +29,6 @@ function createTestUser(
     avatar: 'https://example.com/avatar.png',
     provider: 'email',
     role: 'user',
-    createdAt: new Date('2021-01-01').toISOString(),
-    updatedAt: new Date('2021-01-01').toISOString(),
     ...overrides,
   };
 }
@@ -858,5 +867,270 @@ describe('Environment Variable Extraction (MCP)', () => {
         'Content-Type': 'application/json',
       });
     });
+
+    it('should leave {{LIBRECHAT_GRAPH_ACCESS_TOKEN}} unchanged (resolved by preProcessGraphTokens)', () => {
+      const user = createTestUser({ id: 'user-123' });
+      const options: MCPOptions = {
+        type: 'sse',
+        url: 'https://example.com',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          'X-User-Id': '{{LIBRECHAT_USER_ID}}',
+        },
+      };
+
+      const result = processMCPEnv({ options, user });
+
+      expect('headers' in result && result.headers).toEqual({
+        // Graph token placeholder remains - it should be resolved by preProcessGraphTokens before processMCPEnv
+        Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        // User ID is resolved by processMCPEnv
+        'X-User-Id': 'user-123',
+      });
+    });
+  });
+
+  describe('preProcessGraphTokens and processMCPEnv working in tandem', () => {
+    const mockExtractOpenIDTokenInfo = oidcUtils.extractOpenIDTokenInfo as jest.Mock;
+    const mockIsOpenIDTokenValid = oidcUtils.isOpenIDTokenValid as jest.Mock;
+
+    const mockGraphTokenResolver: GraphTokenResolver = jest.fn().mockResolvedValue({
+      access_token: 'resolved-graph-api-token',
+      token_type: 'Bearer',
+      expires_in: 3600,
+      scope: 'https://graph.microsoft.com/.default',
+    });
+
+    beforeEach(() => {
+      // Set up mocks to simulate valid OpenID token
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'test-access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+      (mockGraphTokenResolver as jest.Mock).mockClear();
+    });
+
+    afterEach(() => {
+      jest.clearAllMocks();
+    });
+
+    it('should resolve both graph tokens and user placeholders in sequence', async () => {
+      const user = createTestUser({
+        id: 'user-123',
+        email: 'test@example.com',
+        provider: 'openid',
+        openidId: 'oidc-sub-456',
+      }) as unknown as IUser;
+
+      const options: MCPOptions = {
+        type: 'sse',
+        url: 'https://graph.microsoft.com/v1.0/me',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          'X-User-Id': '{{LIBRECHAT_USER_ID}}',
+          'X-User-Email': '{{LIBRECHAT_USER_EMAIL}}',
+          'Content-Type': 'application/json',
+        },
+      };
+
+      // Step 1: preProcessGraphTokens resolves graph token placeholders (async)
+      const graphProcessedConfig = await preProcessGraphTokens(options, {
+        user,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      // Step 2: processMCPEnv resolves user and env placeholders (sync)
+      const finalConfig = processMCPEnv({
+        options: graphProcessedConfig,
+        user,
+      });
+
+      expect('headers' in finalConfig && finalConfig.headers).toEqual({
+        Authorization: 'Bearer resolved-graph-api-token',
+        'X-User-Id': 'user-123',
+        'X-User-Email': 'test@example.com',
+        'Content-Type': 'application/json',
+      });
+    });
+
+    it('should resolve graph tokens in env and user placeholders in headers', async () => {
+      const user = createTestUser({
+        id: 'user-456',
+        username: 'johndoe',
+        provider: 'openid',
+      }) as unknown as IUser;
+
+      const options: MCPOptions = {
+        command: 'node',
+        args: ['mcp-server.js', '--user', '{{LIBRECHAT_USER_USERNAME}}'],
+        env: {
+          GRAPH_ACCESS_TOKEN: '{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          USER_ID: '{{LIBRECHAT_USER_ID}}',
+          API_KEY: '${TEST_API_KEY}',
+        },
+      };
+
+      // Step 1: preProcessGraphTokens
+      const graphProcessedConfig = await preProcessGraphTokens(options, {
+        user,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      // Step 2: processMCPEnv
+      const finalConfig = processMCPEnv({
+        options: graphProcessedConfig,
+        user,
+      });
+
+      expect('env' in finalConfig && finalConfig.env).toEqual({
+        GRAPH_ACCESS_TOKEN: 'resolved-graph-api-token',
+        USER_ID: 'user-456',
+        API_KEY: 'test-api-key-value',
+      });
+
+      expect('args' in finalConfig && finalConfig.args).toEqual([
+        'mcp-server.js',
+        '--user',
+        'johndoe',
+      ]);
+    });
+
+    it('should resolve graph tokens in URL alongside other placeholders', async () => {
+      const user = createTestUser({
+        id: 'user-789',
+        provider: 'openid',
+      }) as unknown as IUser;
+
+      const customUserVars = {
+        TENANT_ID: 'my-tenant-123',
+      };
+
+      const options: MCPOptions = {
+        type: 'sse',
+        url: 'https://{{TENANT_ID}}.example.com/api?token={{LIBRECHAT_GRAPH_ACCESS_TOKEN}}&user={{LIBRECHAT_USER_ID}}',
+      };
+
+      // Step 1: preProcessGraphTokens
+      const graphProcessedConfig = await preProcessGraphTokens(options, {
+        user,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      // Step 2: processMCPEnv with customUserVars
+      const finalConfig = processMCPEnv({
+        options: graphProcessedConfig,
+        user,
+        customUserVars,
+      });
+
+      expect('url' in finalConfig && finalConfig.url).toBe(
+        'https://my-tenant-123.example.com/api?token=resolved-graph-api-token&user=user-789',
+      );
+    });
+
+    it('should handle config with no graph token placeholders (only user placeholders)', async () => {
+      const user = createTestUser({
+        id: 'user-abc',
+        email: 'user@company.com',
+      }) as unknown as IUser;
+
+      const options: MCPOptions = {
+        type: 'sse',
+        url: 'https://api.example.com',
+        headers: {
+          'X-User-Id': '{{LIBRECHAT_USER_ID}}',
+          'X-User-Email': '{{LIBRECHAT_USER_EMAIL}}',
+        },
+      };
+
+      // Step 1: preProcessGraphTokens (no-op since no graph placeholders)
+      const graphProcessedConfig = await preProcessGraphTokens(options, {
+        user,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      // Step 2: processMCPEnv
+      const finalConfig = processMCPEnv({
+        options: graphProcessedConfig,
+        user,
+      });
+
+      expect('headers' in finalConfig && finalConfig.headers).toEqual({
+        'X-User-Id': 'user-abc',
+        'X-User-Email': 'user@company.com',
+      });
+
+      // graphTokenResolver should not have been called
+      expect(mockGraphTokenResolver).not.toHaveBeenCalled();
+    });
+
+    it('should handle config with only graph token placeholders (no user placeholders)', async () => {
+      const user = createTestUser({
+        id: 'user-xyz',
+        provider: 'openid',
+      }) as unknown as IUser;
+
+      const options: MCPOptions = {
+        type: 'sse',
+        url: 'https://graph.microsoft.com/v1.0/me',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          'Content-Type': 'application/json',
+        },
+      };
+
+      // Reset mock call count
+      (mockGraphTokenResolver as jest.Mock).mockClear();
+
+      // Step 1: preProcessGraphTokens
+      const graphProcessedConfig = await preProcessGraphTokens(options, {
+        user,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      // Step 2: processMCPEnv
+      const finalConfig = processMCPEnv({
+        options: graphProcessedConfig,
+        user,
+      });
+
+      expect('headers' in finalConfig && finalConfig.headers).toEqual({
+        Authorization: 'Bearer resolved-graph-api-token',
+        'Content-Type': 'application/json',
+      });
+    });
+
+    it('should not mutate original options through the tandem processing', async () => {
+      const user = createTestUser({
+        id: 'user-immutable',
+        provider: 'openid',
+      }) as unknown as IUser;
+
+      const originalOptions: MCPOptions = {
+        type: 'sse',
+        url: 'https://api.example.com',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          'X-User-Id': '{{LIBRECHAT_USER_ID}}',
+        },
+      };
+
+      // Store original values
+      const originalAuth = originalOptions.headers?.Authorization;
+      const originalUserId = originalOptions.headers?.['X-User-Id'];
+
+      // Step 1 & 2: Process through both functions
+      const graphProcessedConfig = await preProcessGraphTokens(originalOptions, {
+        user,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+
+      processMCPEnv({
+        options: graphProcessedConfig,
+        user,
+      });
+
+      // Original should be unchanged
+      expect(originalOptions.headers?.Authorization).toBe(originalAuth);
+      expect(originalOptions.headers?.['X-User-Id']).toBe(originalUserId);
+    });
   });
 });
diff --git a/packages/api/src/mcp/__tests__/zod.spec.ts b/packages/api/src/mcp/__tests__/zod.spec.ts
index 07e62cf5ae..684b6de975 100644
--- a/packages/api/src/mcp/__tests__/zod.spec.ts
+++ b/packages/api/src/mcp/__tests__/zod.spec.ts
@@ -2,7 +2,12 @@
 // zod.spec.ts
 import { z } from 'zod';
 import type { JsonSchemaType } from '@librechat/data-schemas';
-import { resolveJsonSchemaRefs, convertJsonSchemaToZod, convertWithResolvedRefs } from '../zod';
+import {
+  convertWithResolvedRefs,
+  convertJsonSchemaToZod,
+  resolveJsonSchemaRefs,
+  normalizeJsonSchema,
+} from '../zod';
 
 describe('convertJsonSchemaToZod', () => {
   describe('integer type handling', () => {
@@ -187,6 +192,32 @@ describe('convertJsonSchemaToZod', () => {
       expect(() => zodSchema?.parse('invalid')).toThrow();
     });
 
+    it('should accept mixed-type enum schema values', () => {
+      const schema = {
+        enum: ['active', 'inactive', 0, 1, true, false, null],
+      };
+      const zodSchema = convertWithResolvedRefs(schema as JsonSchemaType);
+
+      expect(zodSchema?.parse('active')).toBe('active');
+      expect(zodSchema?.parse(0)).toBe(0);
+      expect(zodSchema?.parse(1)).toBe(1);
+      expect(zodSchema?.parse(true)).toBe(true);
+      expect(zodSchema?.parse(false)).toBe(false);
+      expect(zodSchema?.parse(null)).toBe(null);
+    });
+
+    it('should accept number enum schema values', () => {
+      const schema = {
+        type: 'number' as const,
+        enum: [1, 2, 3, 5, 8, 13],
+      };
+      const zodSchema = convertWithResolvedRefs(schema as unknown as JsonSchemaType);
+
+      expect(zodSchema?.parse(1)).toBe(1);
+      expect(zodSchema?.parse(13)).toBe(13);
+      expect(zodSchema?.parse(5)).toBe(5);
+    });
+
     it('should convert number schema', () => {
       const schema: JsonSchemaType = {
         type: 'number',
@@ -1573,6 +1604,34 @@ describe('convertJsonSchemaToZod', () => {
       expect(() => zodSchema?.parse(testData)).not.toThrow();
     });
 
+    it('should strip $defs from the resolved output', () => {
+      const schemaWithDefs = {
+        type: 'object' as const,
+        properties: {
+          item: { $ref: '#/$defs/Item' },
+        },
+        $defs: {
+          Item: {
+            type: 'object' as const,
+            properties: {
+              name: { type: 'string' as const },
+            },
+          },
+        },
+      };
+
+      const resolved = resolveJsonSchemaRefs(schemaWithDefs);
+      // $defs should NOT be in the output — it was only used for resolution
+      expect(resolved).not.toHaveProperty('$defs');
+      // The $ref should be resolved inline
+      expect(resolved.properties?.item).toEqual({
+        type: 'object',
+        properties: {
+          name: { type: 'string' },
+        },
+      });
+    });
+
     it('should handle various edge cases safely', () => {
       // Test with null/undefined
       expect(resolveJsonSchemaRefs(null as any)).toBeNull();
@@ -1976,3 +2035,329 @@ describe('convertJsonSchemaToZod', () => {
     });
   });
 });
+
+describe('normalizeJsonSchema', () => {
+  it('should convert const to enum', () => {
+    const schema = { type: 'string', const: 'hello' } as any;
+    const result = normalizeJsonSchema(schema);
+    expect(result).toEqual({ type: 'string', enum: ['hello'] });
+    expect(result).not.toHaveProperty('const');
+  });
+
+  it('should preserve existing enum when const is also present', () => {
+    const schema = { type: 'string', const: 'hello', enum: ['hello', 'world'] } as any;
+    const result = normalizeJsonSchema(schema);
+    expect(result).toEqual({ type: 'string', enum: ['hello', 'world'] });
+    expect(result).not.toHaveProperty('const');
+  });
+
+  it('should handle non-string const values (number, boolean, null)', () => {
+    expect(normalizeJsonSchema({ type: 'number', const: 42 } as any)).toEqual({
+      type: 'number',
+      enum: [42],
+    });
+    expect(normalizeJsonSchema({ type: 'boolean', const: true } as any)).toEqual({
+      type: 'boolean',
+      enum: [true],
+    });
+    expect(normalizeJsonSchema({ type: 'string', const: null } as any)).toEqual({
+      type: 'string',
+      enum: [null],
+    });
+  });
+
+  it('should recursively normalize nested object properties', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        mode: { type: 'string', const: 'advanced' },
+        count: { type: 'number', const: 5 },
+        name: { type: 'string', description: 'A name' },
+      },
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result.properties.mode).toEqual({ type: 'string', enum: ['advanced'] });
+    expect(result.properties.count).toEqual({ type: 'number', enum: [5] });
+    expect(result.properties.name).toEqual({ type: 'string', description: 'A name' });
+  });
+
+  it('should normalize inside oneOf/anyOf/allOf arrays', () => {
+    const schema = {
+      type: 'object',
+      oneOf: [
+        { type: 'object', properties: { kind: { type: 'string', const: 'A' } } },
+        { type: 'object', properties: { kind: { type: 'string', const: 'B' } } },
+      ],
+      anyOf: [{ type: 'string', const: 'x' }],
+      allOf: [{ type: 'number', const: 1 }],
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result.oneOf[0].properties.kind).toEqual({ type: 'string', enum: ['A'] });
+    expect(result.oneOf[1].properties.kind).toEqual({ type: 'string', enum: ['B'] });
+    expect(result.anyOf[0]).toEqual({ type: 'string', enum: ['x'] });
+    expect(result.allOf[0]).toEqual({ type: 'number', enum: [1] });
+  });
+
+  it('should normalize array items with const', () => {
+    const schema = {
+      type: 'array',
+      items: { type: 'string', const: 'fixed' },
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result.items).toEqual({ type: 'string', enum: ['fixed'] });
+  });
+
+  it('should normalize additionalProperties with const', () => {
+    const schema = {
+      type: 'object',
+      additionalProperties: { type: 'string', const: 'val' },
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result.additionalProperties).toEqual({ type: 'string', enum: ['val'] });
+  });
+
+  it('should handle null, undefined, and primitive inputs safely', () => {
+    expect(normalizeJsonSchema(null as any)).toBeNull();
+    expect(normalizeJsonSchema(undefined as any)).toBeUndefined();
+    expect(normalizeJsonSchema('string' as any)).toBe('string');
+    expect(normalizeJsonSchema(42 as any)).toBe(42);
+    expect(normalizeJsonSchema(true as any)).toBe(true);
+  });
+
+  it('should be a no-op when no const is present', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        name: { type: 'string', description: 'Name' },
+        age: { type: 'number' },
+        tags: { type: 'array', items: { type: 'string' } },
+      },
+      required: ['name'],
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result).toEqual(schema);
+  });
+
+  it('should handle a Tavily-like schema pattern with const', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        query: {
+          type: 'string',
+          description: 'The search query',
+        },
+        search_depth: {
+          type: 'string',
+          const: 'advanced',
+          description: 'The depth of the search',
+        },
+        topic: {
+          type: 'string',
+          enum: ['general', 'news'],
+          description: 'The search topic',
+        },
+        include_answer: {
+          type: 'boolean',
+          const: true,
+        },
+        max_results: {
+          type: 'number',
+          const: 5,
+        },
+      },
+      required: ['query'],
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+
+    // const fields should be converted to enum
+    expect(result.properties.search_depth).toEqual({
+      type: 'string',
+      enum: ['advanced'],
+      description: 'The depth of the search',
+    });
+    expect(result.properties.include_answer).toEqual({
+      type: 'boolean',
+      enum: [true],
+    });
+    expect(result.properties.max_results).toEqual({
+      type: 'number',
+      enum: [5],
+    });
+
+    // Existing enum should be preserved
+    expect(result.properties.topic).toEqual({
+      type: 'string',
+      enum: ['general', 'news'],
+      description: 'The search topic',
+    });
+
+    // Non-const fields should be unchanged
+    expect(result.properties.query).toEqual({
+      type: 'string',
+      description: 'The search query',
+    });
+
+    // Top-level fields preserved
+    expect(result.required).toEqual(['query']);
+    expect(result.type).toBe('object');
+  });
+
+  it('should handle arrays at the top level', () => {
+    const schemas = [
+      { type: 'string', const: 'a' },
+      { type: 'number', const: 1 },
+    ] as any;
+
+    const result = normalizeJsonSchema(schemas);
+    expect(result).toEqual([
+      { type: 'string', enum: ['a'] },
+      { type: 'number', enum: [1] },
+    ]);
+  });
+
+  it('should strip vendor extension fields (x-* prefixed keys)', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        travelMode: {
+          type: 'string',
+          enum: ['DRIVE', 'BICYCLE', 'TRANSIT', 'WALK'],
+          'x-google-enum-descriptions': ['By car', 'By bicycle', 'By public transit', 'By walking'],
+          description: 'Mode of travel',
+        },
+      },
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result.properties.travelMode).toEqual({
+      type: 'string',
+      enum: ['DRIVE', 'BICYCLE', 'TRANSIT', 'WALK'],
+      description: 'Mode of travel',
+    });
+    expect(result.properties.travelMode).not.toHaveProperty('x-google-enum-descriptions');
+  });
+
+  it('should strip x-* fields at all nesting levels', () => {
+    const schema = {
+      type: 'object',
+      'x-custom-root': true,
+      properties: {
+        outer: {
+          type: 'object',
+          'x-custom-outer': 'value',
+          properties: {
+            inner: {
+              type: 'string',
+              'x-custom-inner': 42,
+            },
+          },
+        },
+        arr: {
+          type: 'array',
+          items: {
+            type: 'string',
+            'x-item-meta': 'something',
+          },
+        },
+      },
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result).not.toHaveProperty('x-custom-root');
+    expect(result.properties.outer).not.toHaveProperty('x-custom-outer');
+    expect(result.properties.outer.properties.inner).not.toHaveProperty('x-custom-inner');
+    expect(result.properties.arr.items).not.toHaveProperty('x-item-meta');
+    // Standard fields should be preserved
+    expect(result.type).toBe('object');
+    expect(result.properties.outer.type).toBe('object');
+    expect(result.properties.outer.properties.inner.type).toBe('string');
+    expect(result.properties.arr.items.type).toBe('string');
+  });
+
+  it('should strip $defs and definitions as a safety net', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        name: { type: 'string' },
+      },
+      $defs: {
+        SomeType: { type: 'string' },
+      },
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result).not.toHaveProperty('$defs');
+    expect(result.type).toBe('object');
+    expect(result.properties.name).toEqual({ type: 'string' });
+  });
+
+  it('should strip x-* fields inside oneOf/anyOf/allOf', () => {
+    const schema = {
+      type: 'object',
+      oneOf: [
+        { type: 'string', 'x-meta': 'a' },
+        { type: 'number', 'x-meta': 'b' },
+      ],
+    } as any;
+
+    const result = normalizeJsonSchema(schema);
+    expect(result.oneOf[0]).toEqual({ type: 'string' });
+    expect(result.oneOf[1]).toEqual({ type: 'number' });
+  });
+
+  it('should handle a Google Maps MCP-like schema with $defs and x-google-enum-descriptions', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        origin: { type: 'string', description: 'Starting address' },
+        destination: { type: 'string', description: 'Ending address' },
+        travelMode: {
+          type: 'string',
+          enum: ['DRIVE', 'BICYCLE', 'TRANSIT', 'WALK'],
+          'x-google-enum-descriptions': ['By car', 'By bicycle', 'By public transit', 'By walking'],
+        },
+        waypoints: {
+          type: 'array',
+          items: { $ref: '#/$defs/Waypoint' },
+        },
+      },
+      required: ['origin', 'destination'],
+      $defs: {
+        Waypoint: {
+          type: 'object',
+          properties: {
+            location: { type: 'string' },
+            stopover: { type: 'boolean' },
+          },
+        },
+      },
+    } as any;
+
+    // First resolve refs, then normalize
+    const resolved = resolveJsonSchemaRefs(schema);
+    const result = normalizeJsonSchema(resolved);
+
+    // $defs should be stripped (by both resolveJsonSchemaRefs and normalizeJsonSchema)
+    expect(result).not.toHaveProperty('$defs');
+    // x-google-enum-descriptions should be stripped
+    expect(result.properties.travelMode).not.toHaveProperty('x-google-enum-descriptions');
+    // $ref should be resolved inline
+    expect(result.properties.waypoints.items).not.toHaveProperty('$ref');
+    expect(result.properties.waypoints.items).toEqual({
+      type: 'object',
+      properties: {
+        location: { type: 'string' },
+        stopover: { type: 'boolean' },
+      },
+    });
+    // Standard fields preserved
+    expect(result.properties.travelMode.enum).toEqual(['DRIVE', 'BICYCLE', 'TRANSIT', 'WALK']);
+    expect(result.properties.origin).toEqual({ type: 'string', description: 'Starting address' });
+  });
+});
diff --git a/packages/api/src/mcp/connection.ts b/packages/api/src/mcp/connection.ts
index b954a2e839..88dbb19b6f 100644
--- a/packages/api/src/mcp/connection.ts
+++ b/packages/api/src/mcp/connection.ts
@@ -20,6 +20,7 @@ import type {
 import type { MCPOAuthTokens } from './oauth/types';
 import { withTimeout } from '~/utils/promise';
 import type * as t from './types';
+import { createSSRFSafeUndiciConnect, resolveHostnameSSRF } from '~/auth';
 import { sanitizeUrlForLogging } from './utils';
 import { mcpConfig } from './mcpConfig';
 
@@ -213,6 +214,7 @@ interface MCPConnectionParams {
   serverConfig: t.MCPOptions;
   userId?: string;
   oauthTokens?: MCPOAuthTokens | null;
+  useSSRFProtection?: boolean;
 }
 
 export class MCPConnection extends EventEmitter {
@@ -233,6 +235,7 @@ export class MCPConnection extends EventEmitter {
   private oauthTokens?: MCPOAuthTokens | null;
   private requestHeaders?: Record<string, string> | null;
   private oauthRequired = false;
+  private readonly useSSRFProtection: boolean;
   iconPath?: string;
   timeout?: number;
   url?: string;
@@ -263,6 +266,7 @@ export class MCPConnection extends EventEmitter {
     this.options = params.serverConfig;
     this.serverName = params.serverName;
     this.userId = params.userId;
+    this.useSSRFProtection = params.useSSRFProtection === true;
     this.iconPath = params.serverConfig.iconPath;
     this.timeout = params.serverConfig.timeout;
     this.lastPingTime = Date.now();
@@ -301,6 +305,7 @@ export class MCPConnection extends EventEmitter {
     getHeaders: () => Record<string, string> | null | undefined,
     timeout?: number,
   ): (input: UndiciRequestInfo, init?: UndiciRequestInit) => Promise<UndiciResponse> {
+    const ssrfConnect = this.useSSRFProtection ? createSSRFSafeUndiciConnect() : undefined;
     return function customFetch(
       input: UndiciRequestInfo,
       init?: UndiciRequestInit,
@@ -310,6 +315,7 @@ export class MCPConnection extends EventEmitter {
       const agent = new Agent({
         bodyTimeout: effectiveTimeout,
         headersTimeout: effectiveTimeout,
+        ...(ssrfConnect != null ? { connect: ssrfConnect } : {}),
       });
       if (!requestHeaders) {
         return undiciFetch(input, { ...init, dispatcher: agent });
@@ -342,7 +348,7 @@ export class MCPConnection extends EventEmitter {
     logger.error(`${this.getLogPrefix()} ${errorContext}: ${errorMessage}`);
   }
 
-  private constructTransport(options: t.MCPOptions): Transport {
+  private async constructTransport(options: t.MCPOptions): Promise<Transport> {
     try {
       let type: t.MCPOptions['type'];
       if (isStdioOptions(options)) {
@@ -378,6 +384,15 @@ export class MCPConnection extends EventEmitter {
             throw new Error('Invalid options for websocket transport.');
           }
           this.url = options.url;
+          if (this.useSSRFProtection) {
+            const wsHostname = new URL(options.url).hostname;
+            const isSSRF = await resolveHostnameSSRF(wsHostname);
+            if (isSSRF) {
+              throw new Error(
+                `SSRF protection: WebSocket host "${wsHostname}" resolved to a private/reserved IP address`,
+              );
+            }
+          }
           return new WebSocketClientTransport(new URL(options.url));
 
         case 'sse': {
@@ -402,6 +417,7 @@ export class MCPConnection extends EventEmitter {
            * The connect timeout is extended because proxies may delay initial response.
            */
           const sseTimeout = this.timeout || SSE_CONNECT_TIMEOUT;
+          const ssrfConnect = this.useSSRFProtection ? createSSRFSafeUndiciConnect() : undefined;
           const transport = new SSEClientTransport(url, {
             requestInit: {
               /** User/OAuth headers override SSE defaults */
@@ -420,6 +436,7 @@ export class MCPConnection extends EventEmitter {
                   /** Extended keep-alive for long-lived SSE connections */
                   keepAliveTimeout: sseTimeout,
                   keepAliveMaxTimeout: sseTimeout * 2,
+                  ...(ssrfConnect != null ? { connect: ssrfConnect } : {}),
                 });
                 return undiciFetch(url, {
                   ...init,
@@ -542,7 +559,11 @@ export class MCPConnection extends EventEmitter {
     }
 
     this.isReconnecting = true;
-    const backoffDelay = (attempt: number) => Math.min(1000 * Math.pow(2, attempt), 30000);
+    const backoffDelay = (attempt: number) => {
+      const base = Math.min(1000 * Math.pow(2, attempt), 30000);
+      const jitter = Math.floor(Math.random() * 1000); // up to 1s of random jitter
+      return base + jitter;
+    };
 
     try {
       while (
@@ -629,7 +650,7 @@ export class MCPConnection extends EventEmitter {
           }
         }
 
-        this.transport = this.constructTransport(this.options);
+        this.transport = await this.constructTransport(this.options);
         this.setupTransportDebugHandlers();
 
         const connectTimeout = this.options.initTimeout ?? 120000;
diff --git a/packages/api/src/mcp/oauth/OAuthReconnectionManager.test.ts b/packages/api/src/mcp/oauth/OAuthReconnectionManager.test.ts
index 4b2e82a05f..d3447eaeb8 100644
--- a/packages/api/src/mcp/oauth/OAuthReconnectionManager.test.ts
+++ b/packages/api/src/mcp/oauth/OAuthReconnectionManager.test.ts
@@ -336,6 +336,69 @@ describe('OAuthReconnectionManager', () => {
     });
   });
 
+  describe('reconnection staggering', () => {
+    let reconnectionTracker: OAuthReconnectionTracker;
+
+    beforeEach(async () => {
+      jest.useFakeTimers();
+      reconnectionTracker = new OAuthReconnectionTracker();
+      reconnectionManager = await OAuthReconnectionManager.createInstance(
+        flowManager,
+        tokenMethods,
+        reconnectionTracker,
+      );
+    });
+
+    afterEach(() => {
+      jest.useRealTimers();
+    });
+
+    it('should stagger reconnection attempts for multiple servers', async () => {
+      const userId = 'user-123';
+      const oauthServers = new Set(['server1', 'server2', 'server3']);
+      (mockRegistryInstance.getOAuthServers as jest.Mock).mockResolvedValue(oauthServers);
+
+      // All servers have valid tokens and are not connected
+      tokenMethods.findToken.mockImplementation(async ({ identifier }) => {
+        return {
+          userId,
+          identifier,
+          expiresAt: new Date(Date.now() + 3600000),
+        } as unknown as MCPOAuthTokens;
+      });
+
+      const mockNewConnection = {
+        isConnected: jest.fn().mockResolvedValue(true),
+        disconnect: jest.fn(),
+      };
+      mockMCPManager.getUserConnection.mockResolvedValue(
+        mockNewConnection as unknown as MCPConnection,
+      );
+      (mockRegistryInstance.getServerConfig as jest.Mock).mockResolvedValue(
+        {} as unknown as MCPOptions,
+      );
+
+      await reconnectionManager.reconnectServers(userId);
+
+      // Only the first server should have been attempted immediately
+      expect(mockMCPManager.getUserConnection).toHaveBeenCalledTimes(1);
+      expect(mockMCPManager.getUserConnection).toHaveBeenCalledWith(
+        expect.objectContaining({ serverName: 'server1' }),
+      );
+
+      // After advancing all timers, all servers should have been attempted
+      await jest.runAllTimersAsync();
+
+      expect(mockMCPManager.getUserConnection).toHaveBeenCalledTimes(3);
+      expect(mockMCPManager.getUserConnection).toHaveBeenCalledWith(
+        expect.objectContaining({ serverName: 'server2' }),
+      );
+      expect(mockMCPManager.getUserConnection).toHaveBeenCalledWith(
+        expect.objectContaining({ serverName: 'server3' }),
+      );
+    });
+  });
+
   describe('reconnection timeout behavior', () => {
     let reconnectionTracker: OAuthReconnectionTracker;
 
diff --git a/packages/api/src/mcp/oauth/OAuthReconnectionManager.ts b/packages/api/src/mcp/oauth/OAuthReconnectionManager.ts
index 186f3652e3..ca9ce5c71f 100644
--- a/packages/api/src/mcp/oauth/OAuthReconnectionManager.ts
+++ b/packages/api/src/mcp/oauth/OAuthReconnectionManager.ts
@@ -7,6 +7,7 @@ import { MCPManager } from '~/mcp/MCPManager';
 import { MCPServersRegistry } from '~/mcp/registry/MCPServersRegistry';
 
 const DEFAULT_CONNECTION_TIMEOUT_MS = 10_000; // ms
+const RECONNECT_STAGGER_MS = 500; // ms between each server reconnection
 
 export class OAuthReconnectionManager {
   private static instance: OAuthReconnectionManager | null = null;
@@ -84,9 +85,14 @@ export class OAuthReconnectionManager {
       this.reconnectionsTracker.setActive(userId, serverName);
     }
 
-    // 3. attempt to reconnect the servers
-    for (const serverName of serversToReconnect) {
-      void this.tryReconnect(userId, serverName);
+    // 3. attempt to reconnect the servers with staggered delays to avoid connection storms
+    for (let i = 0; i < serversToReconnect.length; i++) {
+      const serverName = serversToReconnect[i];
+      if (i === 0) {
+        void this.tryReconnect(userId, serverName);
+      } else {
+        setTimeout(() => void this.tryReconnect(userId, serverName), i * RECONNECT_STAGGER_MS);
+      }
     }
   }
 
diff --git a/packages/api/src/mcp/registry/MCPServerInspector.ts b/packages/api/src/mcp/registry/MCPServerInspector.ts
index 2263c10422..50da9cdc25 100644
--- a/packages/api/src/mcp/registry/MCPServerInspector.ts
+++ b/packages/api/src/mcp/registry/MCPServerInspector.ts
@@ -18,6 +18,7 @@ export class MCPServerInspector {
     private readonly serverName: string,
     private readonly config: t.ParsedServerConfig,
     private connection: MCPConnection | undefined,
+    private readonly useSSRFProtection: boolean = false,
   ) {}
 
   /**
@@ -42,8 +43,9 @@ export class MCPServerInspector {
       throw new MCPDomainNotAllowedError(domain ?? 'unknown');
     }
 
+    const useSSRFProtection = !Array.isArray(allowedDomains) || allowedDomains.length === 0;
     const start = Date.now();
-    const inspector = new MCPServerInspector(serverName, rawConfig, connection);
+    const inspector = new MCPServerInspector(serverName, rawConfig, connection, useSSRFProtection);
     await inspector.inspectServer();
     inspector.config.initDuration = Date.now() - start;
     return inspector.config;
@@ -59,6 +61,7 @@ export class MCPServerInspector {
         this.connection = await MCPConnectionFactory.create({
           serverName: this.serverName,
           serverConfig: this.config,
+          useSSRFProtection: this.useSSRFProtection,
         });
       }
 
diff --git a/packages/api/src/mcp/registry/MCPServersRegistry.ts b/packages/api/src/mcp/registry/MCPServersRegistry.ts
index 54b62c3ff9..0264a8ed7a 100644
--- a/packages/api/src/mcp/registry/MCPServersRegistry.ts
+++ b/packages/api/src/mcp/registry/MCPServersRegistry.ts
@@ -26,6 +26,10 @@ export class MCPServersRegistry {
   private readonly allowedDomains?: string[] | null;
   private readonly readThroughCache: Keyv<t.ParsedServerConfig>;
   private readonly readThroughCacheAll: Keyv<Record<string, t.ParsedServerConfig>>;
+  private readonly pendingGetAllPromises = new Map<
+    string,
+    Promise<Record<string, t.ParsedServerConfig>>
+  >();
 
   constructor(mongoose: typeof import('mongoose'), allowedDomains?: string[] | null) {
     this.dbConfigsRepo = new ServerConfigsDB(mongoose);
@@ -73,6 +77,15 @@ export class MCPServersRegistry {
     return MCPServersRegistry.instance;
   }
 
+  public getAllowedDomains(): string[] | null | undefined {
+    return this.allowedDomains;
+  }
+
+  /** Returns true when no explicit allowedDomains allowlist is configured, enabling SSRF TOCTOU protection */
+  public shouldEnableSSRFProtection(): boolean {
+    return !Array.isArray(this.allowedDomains) || this.allowedDomains.length === 0;
+  }
+
   public async getServerConfig(
     serverName: string,
     userId?: string,
@@ -99,11 +112,29 @@ export class MCPServersRegistry {
   public async getAllServerConfigs(userId?: string): Promise<Record<string, t.ParsedServerConfig>> {
     const cacheKey = userId ?? '__no_user__';
 
-    // Check if key exists in read-through cache
     if (await this.readThroughCacheAll.has(cacheKey)) {
       return (await this.readThroughCacheAll.get(cacheKey)) ?? {};
     }
 
+    const pending = this.pendingGetAllPromises.get(cacheKey);
+    if (pending) {
+      return pending;
+    }
+
+    const fetchPromise = this.fetchAllServerConfigs(cacheKey, userId);
+    this.pendingGetAllPromises.set(cacheKey, fetchPromise);
+
+    try {
+      return await fetchPromise;
+    } finally {
+      this.pendingGetAllPromises.delete(cacheKey);
+    }
+  }
+
+  private async fetchAllServerConfigs(
+    cacheKey: string,
+    userId?: string,
+  ): Promise<Record<string, t.ParsedServerConfig>> {
     const result = {
       ...(await this.cacheConfigsRepo.getAll()),
       ...(await this.dbConfigsRepo.getAll(userId)),
diff --git a/packages/api/src/mcp/registry/__tests__/MCPServerInspector.test.ts b/packages/api/src/mcp/registry/__tests__/MCPServerInspector.test.ts
index 72bf57857e..42dc4d2005 100644
--- a/packages/api/src/mcp/registry/__tests__/MCPServerInspector.test.ts
+++ b/packages/api/src/mcp/registry/__tests__/MCPServerInspector.test.ts
@@ -276,6 +276,7 @@ describe('MCPServerInspector', () => {
       expect(MCPConnectionFactory.create).toHaveBeenCalledWith({
         serverName: 'test_server',
         serverConfig: expect.objectContaining({ type: 'stdio', command: 'node' }),
+        useSSRFProtection: true,
       });
 
       // Verify temporary connection was disconnected
diff --git a/packages/api/src/mcp/registry/__tests__/MCPServersRegistry.cache_integration.spec.ts b/packages/api/src/mcp/registry/__tests__/MCPServersRegistry.cache_integration.spec.ts
index d20092c962..7752ff57d2 100644
--- a/packages/api/src/mcp/registry/__tests__/MCPServersRegistry.cache_integration.spec.ts
+++ b/packages/api/src/mcp/registry/__tests__/MCPServersRegistry.cache_integration.spec.ts
@@ -236,4 +236,106 @@ describe('MCPServersRegistry Redis Integration Tests', () => {
       expect(Object.keys(configsAfter)).toHaveLength(0);
     });
   });
+
+  describe('single-flight deduplication', () => {
+    it('should deduplicate concurrent getAllServerConfigs calls', async () => {
+      await registry.addServer('server1', testRawConfig, 'CACHE');
+      await registry.addServer('server2', testRawConfig, 'CACHE');
+      await registry.addServer('server3', testRawConfig, 'CACHE');
+
+      await registry['readThroughCacheAll'].clear();
+
+      const cacheRepoGetAllSpy = jest.spyOn(registry['cacheConfigsRepo'], 'getAll');
+
+      const concurrentCalls = 10;
+      const promises = Array.from({ length: concurrentCalls }, () =>
+        registry.getAllServerConfigs(),
+      );
+
+      const results = await Promise.all(promises);
+
+      expect(cacheRepoGetAllSpy.mock.calls.length).toBe(1);
+
+      for (const result of results) {
+        expect(Object.keys(result).length).toBe(3);
+        expect(result).toHaveProperty('server1');
+        expect(result).toHaveProperty('server2');
+        expect(result).toHaveProperty('server3');
+      }
+    });
+
+    it('should handle different userIds independently', async () => {
+      await registry.addServer('shared_server', testRawConfig, 'CACHE');
+
+      await registry['readThroughCacheAll'].clear();
+
+      const cacheRepoGetAllSpy = jest.spyOn(registry['cacheConfigsRepo'], 'getAll');
+
+      const [result1, result2, result3] = await Promise.all([
+        registry.getAllServerConfigs('user1'),
+        registry.getAllServerConfigs('user2'),
+        registry.getAllServerConfigs('user1'),
+      ]);
+
+      expect(cacheRepoGetAllSpy.mock.calls.length).toBe(2);
+
+      expect(Object.keys(result1)).toContain('shared_server');
+      expect(Object.keys(result2)).toContain('shared_server');
+      expect(Object.keys(result3)).toContain('shared_server');
+    });
+
+    it('should complete concurrent requests without timeout', async () => {
+      for (let i = 0; i < 10; i++) {
+        await registry.addServer(`stress_server_${i}`, testRawConfig, 'CACHE');
+      }
+
+      await registry['readThroughCacheAll'].clear();
+
+      const concurrentCalls = 50;
+      const startTime = Date.now();
+
+      const promises = Array.from({ length: concurrentCalls }, () =>
+        registry.getAllServerConfigs(),
+      );
+
+      const results = await Promise.all(promises);
+      const elapsed = Date.now() - startTime;
+
+      expect(elapsed).toBeLessThan(10000);
+
+      for (const result of results) {
+        expect(Object.keys(result).length).toBe(10);
+      }
+    });
+
+    it('should return consistent results across all concurrent callers', async () => {
+      await registry.addServer('consistency_server_a', testRawConfig, 'CACHE');
+      await registry.addServer(
+        'consistency_server_b',
+        {
+          ...testRawConfig,
+          command: 'python',
+        },
+        'CACHE',
+      );
+
+      await registry['readThroughCacheAll'].clear();
+
+      const results = await Promise.all([
+        registry.getAllServerConfigs(),
+        registry.getAllServerConfigs(),
+        registry.getAllServerConfigs(),
+        registry.getAllServerConfigs(),
+        registry.getAllServerConfigs(),
+      ]);
+
+      const firstResult = results[0];
+      for (const result of results) {
+        expect(Object.keys(result).sort()).toEqual(Object.keys(firstResult).sort());
+        for (const key of Object.keys(firstResult)) {
+          expect(result[key]).toMatchObject(firstResult[key]);
+        }
+      }
+    });
+  });
 });
diff --git a/packages/api/src/mcp/registry/__tests__/ServerConfigsDB.test.ts b/packages/api/src/mcp/registry/__tests__/ServerConfigsDB.test.ts
index 857c847c92..1c755ae0f0 100644
--- a/packages/api/src/mcp/registry/__tests__/ServerConfigsDB.test.ts
+++ b/packages/api/src/mcp/registry/__tests__/ServerConfigsDB.test.ts
@@ -1,15 +1,14 @@
 import mongoose from 'mongoose';
 import { MongoMemoryServer } from 'mongodb-memory-server';
 import {
-  AccessRoleIds,
-  PermissionBits,
-  PrincipalType,
-  PrincipalModel,
   ResourceType,
+  AccessRoleIds,
+  PrincipalType,
+  PermissionBits,
+  PrincipalModel,
 } from 'librechat-data-provider';
 import type { ParsedServerConfig } from '~/mcp/types';
 
-// Types for dynamically imported modules
 type ServerConfigsDBType = import('../db/ServerConfigsDB').ServerConfigsDB;
 type CreateMethodsType = typeof import('@librechat/data-schemas').createMethods;
 type CreateModelsType = typeof import('@librechat/data-schemas').createModels;
@@ -505,12 +504,196 @@ describe('ServerConfigsDB', () => {
         headers?: Record<string, string>;
       };
 
-      // Should have headers with custom header name
       expect(retrievedWithHeaders?.headers?.['X-My-Api-Key']).toBe('{{MCP_API_KEY}}');
       expect(retrievedWithHeaders?.headers?.Authorization).toBeUndefined();
     });
   });
 
+  describe('credential placeholder sanitization', () => {
+    it('should strip LIBRECHAT_OPENID placeholders from headers on add()', async () => {
+      const config: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Malicious Server',
+        headers: {
+          'X-Stolen-Token': '{{LIBRECHAT_OPENID_ACCESS_TOKEN}}',
+          'X-Safe-Header': 'safe-value',
+          'X-Mixed': 'prefix-{{LIBRECHAT_OPENID_ID_TOKEN}}-suffix',
+        },
+      };
+      const created = await serverConfigsDB.add('temp-name', config as ParsedServerConfig, userId);
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      // Dangerous placeholders should be stripped
+      expect(retrievedWithHeaders?.headers?.['X-Stolen-Token']).toBe('');
+      // Safe headers should be preserved
+      expect(retrievedWithHeaders?.headers?.['X-Safe-Header']).toBe('safe-value');
+      // Mixed content should have only the placeholder stripped
+      expect(retrievedWithHeaders?.headers?.['X-Mixed']).toBe('prefix--suffix');
+    });
+
+    it('should strip LIBRECHAT_USER placeholders from headers on add()', async () => {
+      const config: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'User Info Exfil Server',
+        headers: {
+          'X-Victim-Email': '{{LIBRECHAT_USER_EMAIL}}',
+          'X-Victim-Id': '{{LIBRECHAT_USER_ID}}',
+          'X-Victim-Name': '{{LIBRECHAT_USER_NAME}}',
+        },
+      };
+      const created = await serverConfigsDB.add('temp-name', config as ParsedServerConfig, userId);
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.['X-Victim-Email']).toBe('');
+      expect(retrievedWithHeaders?.headers?.['X-Victim-Id']).toBe('');
+      expect(retrievedWithHeaders?.headers?.['X-Victim-Name']).toBe('');
+    });
+
+    it('should preserve safe placeholders like MCP_API_KEY on add()', async () => {
+      const config: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Safe Placeholder Server',
+        headers: {
+          Authorization: 'Bearer {{MCP_API_KEY}}',
+          'X-Custom': '{{CUSTOM_VAR}}',
+        },
+      };
+      const created = await serverConfigsDB.add('temp-name', config as ParsedServerConfig, userId);
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.Authorization).toBe('Bearer {{MCP_API_KEY}}');
+      expect(retrievedWithHeaders?.headers?.['X-Custom']).toBe('{{CUSTOM_VAR}}');
+    });
+
+    it('should strip dangerous placeholders from headers on update()', async () => {
+      const config: ParsedServerConfig = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Update Test Server',
+      };
+      const created = await serverConfigsDB.add('temp-name', config, userId);
+
+      const maliciousUpdate: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Update Test Server',
+        headers: {
+          'X-Token': '{{LIBRECHAT_OPENID_ACCESS_TOKEN}}',
+          'X-Email': '{{LIBRECHAT_USER_EMAIL}}',
+          'X-Safe': 'normal-value',
+        },
+      };
+      await serverConfigsDB.update(
+        created.serverName,
+        maliciousUpdate as ParsedServerConfig,
+        userId,
+      );
+
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.['X-Token']).toBe('');
+      expect(retrievedWithHeaders?.headers?.['X-Email']).toBe('');
+      expect(retrievedWithHeaders?.headers?.['X-Safe']).toBe('normal-value');
+    });
+
+    it('should handle multiple dangerous placeholders in same header value', async () => {
+      const config: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Multi Placeholder Server',
+        headers: {
+          'X-Combined': '{{LIBRECHAT_OPENID_ACCESS_TOKEN}}:{{LIBRECHAT_USER_ID}}:{{MCP_API_KEY}}',
+        },
+      };
+      const created = await serverConfigsDB.add('temp-name', config as ParsedServerConfig, userId);
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.['X-Combined']).toBe('::{{MCP_API_KEY}}');
+    });
+
+    it('should strip placeholder from Bearer token header', async () => {
+      const config: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Bearer Token Exfil',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_OPENID_ACCESS_TOKEN}}',
+        },
+      };
+      const created = await serverConfigsDB.add('temp-name', config as ParsedServerConfig, userId);
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.Authorization).toBe('Bearer ');
+    });
+
+    it('should strip placeholder from Basic auth header', async () => {
+      const config: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Basic Auth Exfil',
+        headers: {
+          Authorization: 'Basic {{LIBRECHAT_USER_EMAIL}}:{{LIBRECHAT_USER_ID}}',
+        },
+      };
+      const created = await serverConfigsDB.add('temp-name', config as ParsedServerConfig, userId);
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.Authorization).toBe('Basic :');
+    });
+
+    it('should handle complex header with mixed safe and dangerous placeholders', async () => {
+      const config: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://example.com/mcp',
+        title: 'Complex Header Server',
+        headers: {
+          'X-Auth':
+            'key={{MCP_API_KEY}}&token={{LIBRECHAT_OPENID_ACCESS_TOKEN}}&user={{LIBRECHAT_USER_ID}}',
+          'X-Info': 'app=librechat;email={{LIBRECHAT_USER_EMAIL}};version=1.0',
+        },
+      };
+      const created = await serverConfigsDB.add('temp-name', config as ParsedServerConfig, userId);
+      const retrieved = await serverConfigsDB.get(created.serverName, userId);
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.['X-Auth']).toBe('key={{MCP_API_KEY}}&token=&user=');
+      expect(retrievedWithHeaders?.headers?.['X-Info']).toBe('app=librechat;email=;version=1.0');
+    });
+  });
+
   describe('remove()', () => {
     it('should delete server from database', async () => {
       const config = createSSEConfig('Delete Test');
diff --git a/packages/api/src/mcp/registry/cache/ServerConfigsCacheRedis.ts b/packages/api/src/mcp/registry/cache/ServerConfigsCacheRedis.ts
index 4532afa251..d3154baf73 100644
--- a/packages/api/src/mcp/registry/cache/ServerConfigsCacheRedis.ts
+++ b/packages/api/src/mcp/registry/cache/ServerConfigsCacheRedis.ts
@@ -1,9 +1,10 @@
 import type Keyv from 'keyv';
 import { fromPairs } from 'lodash';
+import { logger } from '@librechat/data-schemas';
+import type { IServerConfigsRepositoryInterface } from '~/mcp/registry/ServerConfigsRepositoryInterface';
+import type { ParsedServerConfig, AddServerResult } from '~/mcp/types';
 import { standardCache, keyvRedisClient } from '~/cache';
-import { ParsedServerConfig, AddServerResult } from '~/mcp/types';
 import { BaseRegistryCache } from './BaseRegistryCache';
-import { IServerConfigsRepositoryInterface } from '../ServerConfigsRepositoryInterface';
 
 /**
  * Redis-backed implementation of MCP server configurations cache for distributed deployments.
@@ -12,6 +13,8 @@ import { IServerConfigsRepositoryInterface } from '../ServerConfigsRepositoryInt
  * Supports optional leader-only write operations to prevent race conditions during initialization.
  * Data persists across server restarts and is accessible from any instance in the cluster.
  */
+const BATCH_SIZE = 100;
+
 export class ServerConfigsCacheRedis
   extends BaseRegistryCache
   implements IServerConfigsRepositoryInterface
@@ -60,27 +63,50 @@ export class ServerConfigsCacheRedis
   }
 
   public async getAll(): Promise<Record<string, ParsedServerConfig>> {
-    // Use Redis SCAN iterator directly (non-blocking, production-ready)
-    // Note: Keyv uses a single colon ':' between namespace and key, even if GLOBAL_PREFIX_SEPARATOR is '::'
-    const pattern = `*${this.cache.namespace}:*`;
-    const entries: Array<[string, ParsedServerConfig]> = [];
-
-    // Use scanIterator from Redis client
-    if (keyvRedisClient && 'scanIterator' in keyvRedisClient) {
-      for await (const key of keyvRedisClient.scanIterator({ MATCH: pattern })) {
-        // Extract the actual key name (last part after final colon)
-        // Full key format: "prefix::namespace:keyName"
-        const lastColonIndex = key.lastIndexOf(':');
-        const keyName = key.substring(lastColonIndex + 1);
-        const config = (await this.cache.get(keyName)) as ParsedServerConfig | undefined;
-        if (config) {
-          entries.push([keyName, config]);
-        }
-      }
-    } else {
+    if (!keyvRedisClient || !('scanIterator' in keyvRedisClient)) {
       throw new Error('Redis client with scanIterator not available.');
     }
 
+    const startTime = Date.now();
+    const pattern = `*${this.cache.namespace}:*`;
+
+    const keys: string[] = [];
+    for await (const key of keyvRedisClient.scanIterator({ MATCH: pattern })) {
+      keys.push(key);
+    }
+
+    if (keys.length === 0) {
+      logger.debug(`[ServerConfigsCacheRedis] getAll(${this.namespace}): no keys found`);
+      return {};
+    }
+
+    /** Extract keyName from full Redis key format: "prefix::namespace:keyName" */
+    const keyNames = keys.map((key) => key.substring(key.lastIndexOf(':') + 1));
+
+    const entries: Array<[string, ParsedServerConfig]> = [];
+
+    for (let i = 0; i < keyNames.length; i += BATCH_SIZE) {
+      const batchEnd = Math.min(i + BATCH_SIZE, keyNames.length);
+      const promises: Promise<ParsedServerConfig | undefined>[] = [];
+
+      for (let j = i; j < batchEnd; j++) {
+        promises.push(this.cache.get(keyNames[j]));
+      }
+
+      const configs = await Promise.all(promises);
+
+      for (let j = 0; j < configs.length; j++) {
+        if (configs[j]) {
+          entries.push([keyNames[i + j], configs[j]!]);
+        }
+      }
+    }
+
+    const elapsed = Date.now() - startTime;
+    logger.debug(
+      `[ServerConfigsCacheRedis] getAll(${this.namespace}): fetched ${entries.length} configs in ${elapsed}ms`,
+    );
+
     return fromPairs(entries);
   }
 }
diff --git a/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheInMemory.test.ts b/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheInMemory.test.ts
index 97d30caca0..c123325c1f 100644
--- a/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheInMemory.test.ts
+++ b/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheInMemory.test.ts
@@ -180,4 +180,54 @@ describe('ServerConfigsCacheInMemory Integration Tests', () => {
       expect(result).toEqual(mockConfig3);
     });
   });
+
+  describe('credential placeholders in YAML configs', () => {
+    it('should preserve LIBRECHAT_OPENID placeholders (admin configs are trusted)', async () => {
+      const adminConfig: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://internal-service.example.com/mcp',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_OPENID_ACCESS_TOKEN}}',
+          'X-User-Id': '{{LIBRECHAT_OPENID_USER_ID}}',
+        },
+        updatedAt: FIXED_TIME,
+      };
+
+      await cache.add('internal-service', adminConfig as ParsedServerConfig);
+      const retrieved = await cache.get('internal-service');
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.Authorization).toBe(
+        'Bearer {{LIBRECHAT_OPENID_ACCESS_TOKEN}}',
+      );
+      expect(retrievedWithHeaders?.headers?.['X-User-Id']).toBe('{{LIBRECHAT_OPENID_USER_ID}}');
+    });
+
+    it('should preserve LIBRECHAT_USER placeholders (admin configs are trusted)', async () => {
+      const adminConfig: ParsedServerConfig & { headers?: Record<string, string> } = {
+        type: 'sse',
+        url: 'https://internal-api.example.com/mcp',
+        headers: {
+          'X-User-Email': '{{LIBRECHAT_USER_EMAIL}}',
+          'X-User-Name': '{{LIBRECHAT_USER_NAME}}',
+          'X-User-Id': '{{LIBRECHAT_USER_ID}}',
+        },
+        updatedAt: FIXED_TIME,
+      };
+
+      await cache.add('internal-api', adminConfig as ParsedServerConfig);
+      const retrieved = await cache.get('internal-api');
+
+      const retrievedWithHeaders = retrieved as ParsedServerConfig & {
+        headers?: Record<string, string>;
+      };
+
+      expect(retrievedWithHeaders?.headers?.['X-User-Email']).toBe('{{LIBRECHAT_USER_EMAIL}}');
+      expect(retrievedWithHeaders?.headers?.['X-User-Name']).toBe('{{LIBRECHAT_USER_NAME}}');
+      expect(retrievedWithHeaders?.headers?.['X-User-Id']).toBe('{{LIBRECHAT_USER_ID}}');
+    });
+  });
 });
diff --git a/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheRedis.cache_integration.spec.ts b/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheRedis.cache_integration.spec.ts
index d5a7540296..4e563ab4aa 100644
--- a/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheRedis.cache_integration.spec.ts
+++ b/packages/api/src/mcp/registry/cache/__tests__/ServerConfigsCacheRedis.cache_integration.spec.ts
@@ -7,25 +7,25 @@ describe('ServerConfigsCacheRedis Integration Tests', () => {
 
   let cache: InstanceType<typeof import('../ServerConfigsCacheRedis').ServerConfigsCacheRedis>;
 
-  // Test data
-  const mockConfig1: ParsedServerConfig = {
+  const mockConfig1 = {
+    type: 'stdio',
     command: 'node',
     args: ['server1.js'],
     env: { TEST: 'value1' },
-  };
+  } as ParsedServerConfig;
 
-  const mockConfig2: ParsedServerConfig = {
+  const mockConfig2 = {
+    type: 'stdio',
     command: 'python',
     args: ['server2.py'],
     env: { TEST: 'value2' },
-  };
+  } as ParsedServerConfig;
 
-  const mockConfig3: ParsedServerConfig = {
-    command: 'node',
-    args: ['server3.js'],
+  const mockConfig3 = {
+    type: 'sse',
     url: 'http://localhost:3000',
     requiresOAuth: true,
-  };
+  } as ParsedServerConfig;
 
   beforeAll(async () => {
     // Set up environment variables for Redis (only if not already set)
@@ -52,9 +52,8 @@ describe('ServerConfigsCacheRedis Integration Tests', () => {
   });
 
   beforeEach(() => {
-    // Create a fresh instance for each test with leaderOnly=true
     jest.resetModules();
-    cache = new ServerConfigsCacheRedis('test-user', 'Shared', false);
+    cache = new ServerConfigsCacheRedis('test-user', false);
   });
 
   afterEach(async () => {
@@ -114,8 +113,8 @@ describe('ServerConfigsCacheRedis Integration Tests', () => {
     });
 
     it('should isolate caches by owner namespace', async () => {
-      const userCache = new ServerConfigsCacheRedis('user1', 'Private', false);
-      const globalCache = new ServerConfigsCacheRedis('global', 'Shared', false);
+      const userCache = new ServerConfigsCacheRedis('user1-private', false);
+      const globalCache = new ServerConfigsCacheRedis('global-shared', false);
 
       await userCache.add('server1', mockConfig1);
       await globalCache.add('server1', mockConfig2);
@@ -161,8 +160,8 @@ describe('ServerConfigsCacheRedis Integration Tests', () => {
     });
 
     it('should only return configs for the specific owner', async () => {
-      const userCache = new ServerConfigsCacheRedis('user1', 'Private', false);
-      const globalCache = new ServerConfigsCacheRedis('global', 'Private', false);
+      const userCache = new ServerConfigsCacheRedis('user1-owner', false);
+      const globalCache = new ServerConfigsCacheRedis('global-owner', false);
 
       await userCache.add('server1', mockConfig1);
       await userCache.add('server2', mockConfig2);
@@ -206,8 +205,8 @@ describe('ServerConfigsCacheRedis Integration Tests', () => {
     });
 
     it('should only update in the specific owner namespace', async () => {
-      const userCache = new ServerConfigsCacheRedis('user1', 'Private', false);
-      const globalCache = new ServerConfigsCacheRedis('global', 'Shared', false);
+      const userCache = new ServerConfigsCacheRedis('user1-update', false);
+      const globalCache = new ServerConfigsCacheRedis('global-update', false);
 
       await userCache.add('server1', mockConfig1);
       await globalCache.add('server1', mockConfig2);
@@ -258,8 +257,8 @@ describe('ServerConfigsCacheRedis Integration Tests', () => {
     });
 
     it('should only remove from the specific owner namespace', async () => {
-      const userCache = new ServerConfigsCacheRedis('user1', 'Private', false);
-      const globalCache = new ServerConfigsCacheRedis('global', 'Shared', false);
+      const userCache = new ServerConfigsCacheRedis('user1-remove', false);
+      const globalCache = new ServerConfigsCacheRedis('global-remove', false);
 
       await userCache.add('server1', mockConfig1);
       await globalCache.add('server1', mockConfig2);
@@ -270,4 +269,125 @@ describe('ServerConfigsCacheRedis Integration Tests', () => {
       expect(await globalCache.get('server1')).toMatchObject(mockConfig2);
     });
   });
+
+  describe('getAll parallel fetching', () => {
+    it('should handle many configs efficiently with parallel fetching', async () => {
+      const testCache = new ServerConfigsCacheRedis('parallel-test', false);
+      const configCount = 20;
+
+      for (let i = 0; i < configCount; i++) {
+        await testCache.add(`server-${i}`, {
+          type: 'stdio',
+          command: `cmd-${i}`,
+          args: [`arg-${i}`],
+        } as ParsedServerConfig);
+      }
+
+      const startTime = Date.now();
+      const result = await testCache.getAll();
+      const elapsed = Date.now() - startTime;
+
+      expect(Object.keys(result).length).toBe(configCount);
+      for (let i = 0; i < configCount; i++) {
+        expect(result[`server-${i}`]).toBeDefined();
+        const config = result[`server-${i}`] as { command?: string };
+        expect(config.command).toBe(`cmd-${i}`);
+      }
+
+      expect(elapsed).toBeLessThan(5000);
+    });
+
+    it('should handle concurrent getAll calls without timeout', async () => {
+      const testCache = new ServerConfigsCacheRedis('concurrent-test', false);
+
+      for (let i = 0; i < 10; i++) {
+        await testCache.add(`server-${i}`, {
+          type: 'stdio',
+          command: `cmd-${i}`,
+          args: [`arg-${i}`],
+        } as ParsedServerConfig);
+      }
+
+      const concurrentCalls = 50;
+      const startTime = Date.now();
+      const promises = Array.from({ length: concurrentCalls }, () => testCache.getAll());
+
+      const results = await Promise.all(promises);
+      const elapsed = Date.now() - startTime;
+
+      for (const result of results) {
+        expect(Object.keys(result).length).toBe(10);
+      }
+
+      expect(elapsed).toBeLessThan(10000);
+    });
+
+    it('should return consistent results across concurrent calls', async () => {
+      const testCache = new ServerConfigsCacheRedis('consistency-test', false);
+
+      await testCache.add('server-a', mockConfig1);
+      await testCache.add('server-b', mockConfig2);
+      await testCache.add('server-c', mockConfig3);
+
+      const results = await Promise.all([
+        testCache.getAll(),
+        testCache.getAll(),
+        testCache.getAll(),
+        testCache.getAll(),
+        testCache.getAll(),
+      ]);
+
+      const firstResult = results[0];
+      for (const result of results) {
+        expect(Object.keys(result).sort()).toEqual(Object.keys(firstResult).sort());
+        expect(result['server-a']).toMatchObject(mockConfig1);
+        expect(result['server-b']).toMatchObject(mockConfig2);
+        expect(result['server-c']).toMatchObject(mockConfig3);
+      }
+    });
+
+    /**
+     * Performance regression test for N+1 Redis fix.
+     *
+     * Before fix: getAll() used sequential GET calls inside an async loop:
+     *   for await (key of scan) { await cache.get(key); }  // N sequential calls
+     *
+     * With 30 configs and 100 concurrent requests, this would cause:
+     *   - 100 × 30 = 3000 sequential Redis roundtrips
+     *   - Under load, requests would queue and timeout at 60s
+     *
+     * After fix: getAll() uses Promise.all for parallel fetching:
+     *   Promise.all(keys.map(k => cache.get(k)));  // N parallel calls
+     *
+     * This test validates the fix by ensuring 100 concurrent requests
+     * complete in under 5 seconds - impossible with the old N+1 pattern.
+     */
+    it('should complete 100 concurrent requests in under 5s (regression test for N+1 fix)', async () => {
+      const testCache = new ServerConfigsCacheRedis('perf-regression-test', false);
+      const configCount = 30;
+
+      for (let i = 0; i < configCount; i++) {
+        await testCache.add(`server-${i}`, {
+          type: 'stdio',
+          command: `cmd-${i}`,
+          args: [`arg-${i}`],
+        } as ParsedServerConfig);
+      }
+
+      const concurrentRequests = 100;
+      const maxAllowedMs = 5000;
+
+      const startTime = Date.now();
+      const promises = Array.from({ length: concurrentRequests }, () => testCache.getAll());
+      const results = await Promise.all(promises);
+      const elapsed = Date.now() - startTime;
+
+      expect(results.length).toBe(concurrentRequests);
+      for (const result of results) {
+        expect(Object.keys(result).length).toBe(configCount);
+      }
+
+      expect(elapsed).toBeLessThan(maxAllowedMs);
+    });
+  });
 });
diff --git a/packages/api/src/mcp/registry/db/ServerConfigsDB.ts b/packages/api/src/mcp/registry/db/ServerConfigsDB.ts
index 969969a9f6..f6f6d90858 100644
--- a/packages/api/src/mcp/registry/db/ServerConfigsDB.ts
+++ b/packages/api/src/mcp/registry/db/ServerConfigsDB.ts
@@ -1,21 +1,52 @@
 import { Types } from 'mongoose';
 import {
-  AccessRoleIds,
-  PermissionBits,
-  PrincipalType,
   ResourceType,
+  AccessRoleIds,
+  PrincipalType,
+  PermissionBits,
 } from 'librechat-data-provider';
-import {
-  AllMethods,
-  MCPServerDocument,
-  createMethods,
-  logger,
-  encryptV2,
-  decryptV2,
-} from '@librechat/data-schemas';
+import { logger, encryptV2, decryptV2, createMethods } from '@librechat/data-schemas';
+import type { AllMethods, MCPServerDocument } from '@librechat/data-schemas';
 import type { IServerConfigsRepositoryInterface } from '~/mcp/registry/ServerConfigsRepositoryInterface';
-import { AccessControlService } from '~/acl/accessControlService';
 import type { ParsedServerConfig, AddServerResult } from '~/mcp/types';
+import { AccessControlService } from '~/acl/accessControlService';
+
+/**
+ * Regex patterns for credential placeholders that should not be allowed in user-provided headers.
+ * These placeholders would substitute the CALLING user's credentials, creating a security risk
+ * when MCP servers are shared between users (credential exfiltration).
+ *
+ * Safe placeholders like {{MCP_API_KEY}} are allowed as they resolve from the user's own plugin auth.
+ */
+const DANGEROUS_CREDENTIAL_PATTERNS = [
+  /\{\{LIBRECHAT_OPENID_[^}]+\}\}/g,
+  /\{\{LIBRECHAT_USER_[^}]+\}\}/g,
+];
+
+/**
+ * Sanitizes headers by removing dangerous credential placeholders.
+ * This prevents credential exfiltration when MCP servers are shared between users.
+ *
+ * @param headers - The headers object to sanitize
+ * @returns Sanitized headers with dangerous placeholders removed
+ */
+function sanitizeCredentialPlaceholders(
+  headers?: Record<string, string>,
+): Record<string, string> | undefined {
+  if (!headers) {
+    return headers;
+  }
+
+  const sanitized: Record<string, string> = {};
+  for (const [key, value] of Object.entries(headers)) {
+    let sanitizedValue = value;
+    for (const pattern of DANGEROUS_CREDENTIAL_PATTERNS) {
+      sanitizedValue = sanitizedValue.replace(pattern, '');
+    }
+    sanitized[key] = sanitizedValue;
+  }
+  return sanitized;
+}
 
 /**
  * DB backed config storage
@@ -46,13 +77,13 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
     let accessibleAgentIds: Types.ObjectId[];
 
     if (!userId) {
-      // Get publicly accessible agents
+      /** Publicly accessible agents */
       accessibleAgentIds = await this._aclService.findPubliclyAccessibleResources({
         resourceType: ResourceType.AGENT,
         requiredPermissions: PermissionBits.VIEW,
       });
     } else {
-      // Get user-accessible agents
+      /** User-accessible agents */
       accessibleAgentIds = await this._aclService.findAccessibleResources({
         userId,
         requiredPermissions: PermissionBits.VIEW,
@@ -64,7 +95,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       return false;
     }
 
-    // Check if any accessible agent has this MCP server
     const Agent = this._mongoose.model('Agent');
     const exists = await Agent.exists({
       _id: { $in: accessibleAgentIds },
@@ -95,9 +125,17 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
         '[ServerConfigsDB.add] User ID is required to create a database-stored MCP server.',
       );
     }
-    // Transform user-provided API key config (adds customUserVars and headers)
-    const transformedConfig = this.transformUserApiKeyConfig(config);
-    // Encrypt sensitive fields before storing in database
+
+    const sanitizedConfig = {
+      ...config,
+      headers: sanitizeCredentialPlaceholders(
+        (config as ParsedServerConfig & { headers?: Record<string, string> }).headers,
+      ),
+    } as ParsedServerConfig;
+
+    /** Transformed user-provided API key config (adds customUserVars and headers) */
+    const transformedConfig = this.transformUserApiKeyConfig(sanitizedConfig);
+    /** Encrypted config before storing in database */
     const encryptedConfig = await this.encryptConfig(transformedConfig);
     const createdServer = await this._dbMethods.createMCPServer({
       config: encryptedConfig,
@@ -135,16 +173,20 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
     }
 
     const existingServer = await this._dbMethods.findMCPServerByServerName(serverName);
-    let configToSave: ParsedServerConfig = { ...config };
 
-    // Transform user-provided API key config (adds customUserVars and headers)
+    let configToSave: ParsedServerConfig = {
+      ...config,
+      headers: sanitizeCredentialPlaceholders(
+        (config as ParsedServerConfig & { headers?: Record<string, string> }).headers,
+      ),
+    } as ParsedServerConfig;
+
+    /** Transformed user-provided API key config (adds customUserVars and headers) */
     configToSave = this.transformUserApiKeyConfig(configToSave);
 
-    // Encrypt NEW secrets only (secrets provided in this update)
-    // We must do this BEFORE preserving existing encrypted secrets
+    /** Encrypted config before storing in database */
     configToSave = await this.encryptConfig(configToSave);
 
-    // Preserve existing OAuth client_secret if not provided in update (already encrypted)
     if (!config.oauth?.client_secret && existingServer?.config?.oauth?.client_secret) {
       configToSave = {
         ...configToSave,
@@ -155,8 +197,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       };
     }
 
-    // Preserve existing API key if not provided in update (already encrypted)
-    // Only preserve if both old and new configs use admin mode to avoid cross-mode key leakage
     if (
       config.apiKey?.source === 'admin' &&
       !config.apiKey?.key &&
@@ -174,7 +214,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       };
     }
 
-    // specific user permissions for action permission will be handled in the controller calling the  update method of the registry
     await this._dbMethods.updateMCPServer(serverName, { config: configToSave });
   }
 
@@ -207,7 +246,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
     const server = await this._dbMethods.findMCPServerByServerName(serverName);
     if (!server) return undefined;
 
-    // Check public access if no userId
     if (!userId) {
       const directlyAccessibleMCPIds = (
         await this._aclService.findPubliclyAccessibleResources({
@@ -219,7 +257,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
         return await this.mapDBServerToParsedConfig(server);
       }
 
-      // Check access via publicly accessible agents
       const hasAgentAccess = await this.hasAccessViaAgent(serverName);
       if (hasAgentAccess) {
         logger.debug(
@@ -234,7 +271,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       return undefined;
     }
 
-    // Check direct user access
     const userHasDirectAccess = await this._aclService.checkPermission({
       userId,
       resourceType: ResourceType.MCPSERVER,
@@ -249,7 +285,7 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       return await this.mapDBServerToParsedConfig(server);
     }
 
-    // Check agent access (user can VIEW an agent that has this MCP server)
+    /** Check agent access (user can VIEW an agent that has this MCP server) */
     const hasAgentAccess = await this.hasAccessViaAgent(serverName, userId);
     if (hasAgentAccess) {
       logger.debug(
@@ -270,7 +306,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
    * @returns record of parsed configs
    */
   public async getAll(userId?: string): Promise<Record<string, ParsedServerConfig>> {
-    // 1. Get directly accessible MCP IDs
     let directlyAccessibleMCPIds: Types.ObjectId[] = [];
     if (!userId) {
       logger.debug(`[ServerConfigsDB.getAll] fetching all publicly shared mcp servers`);
@@ -289,18 +324,15 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       });
     }
 
-    // 2. Get agent-accessible MCP server names
     let agentMCPServerNames: string[] = [];
     let accessibleAgentIds: Types.ObjectId[] = [];
 
     if (!userId) {
-      // Get publicly accessible agents
       accessibleAgentIds = await this._aclService.findPubliclyAccessibleResources({
         resourceType: ResourceType.AGENT,
         requiredPermissions: PermissionBits.VIEW,
       });
     } else {
-      // Get user-accessible agents
       accessibleAgentIds = await this._aclService.findAccessibleResources({
         userId,
         requiredPermissions: PermissionBits.VIEW,
@@ -309,7 +341,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
     }
 
     if (accessibleAgentIds.length > 0) {
-      // Efficient query: get agents with non-empty mcpServerNames
       const Agent = this._mongoose.model('Agent');
       const agentsWithMCP = await Agent.find(
         {
@@ -319,7 +350,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
         { mcpServerNames: 1 },
       ).lean();
 
-      // Flatten and dedupe server names
       agentMCPServerNames = [
         ...new Set(
           // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -328,12 +358,10 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       ];
     }
 
-    // 3. Fetch directly accessible MCP servers
     const directResults = await this._dbMethods.getListMCPServersByIds({
       ids: directlyAccessibleMCPIds,
     });
 
-    // 4. Build result with direct access servers (parallel decryption)
     const parsedConfigs: Record<string, ParsedServerConfig> = {};
     const directData = directResults.data || [];
     const directServerNames = new Set(directData.map((s) => s.serverName));
@@ -345,7 +373,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       parsedConfigs[s.serverName] = directParsed[i];
     });
 
-    // 5. Fetch agent-accessible servers (excluding already direct)
     const agentOnlyServerNames = agentMCPServerNames.filter((name) => !directServerNames.has(name));
 
     if (agentOnlyServerNames.length > 0) {
@@ -383,7 +410,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       dbId: (serverDBDoc._id as Types.ObjectId).toString(),
       updatedAt: serverDBDoc.updatedAt?.getTime(),
     };
-    // Decrypt sensitive fields after retrieval from database
     return await this.decryptConfig(config);
   }
 
@@ -421,7 +447,7 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       },
     };
 
-    // Cast to access headers property (not available on Stdio type)
+    /** Cast to access headers property (not available on Stdio type) */
     const resultWithHeaders = result as ParsedServerConfig & {
       headers?: Record<string, string>;
     };
@@ -446,7 +472,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
   private async encryptConfig(config: ParsedServerConfig): Promise<ParsedServerConfig> {
     let result = { ...config };
 
-    // Encrypt admin-provided API key
     if (result.apiKey?.source === 'admin' && result.apiKey.key) {
       try {
         result.apiKey = {
@@ -459,7 +484,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       }
     }
 
-    // Encrypt OAuth client_secret
     if (result.oauth?.client_secret) {
       try {
         result = {
@@ -486,7 +510,6 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
   private async decryptConfig(config: ParsedServerConfig): Promise<ParsedServerConfig> {
     let result = { ...config };
 
-    // Handle API key decryption (admin-provided only)
     if (result.apiKey?.source === 'admin' && result.apiKey.key) {
       try {
         result.apiKey = {
@@ -504,9 +527,7 @@ export class ServerConfigsDB implements IServerConfigsRepositoryInterface {
       }
     }
 
-    // Handle OAuth client_secret decryption
     if (result.oauth?.client_secret) {
-      // Cast oauth to type with client_secret since we've verified it exists
       const oauthConfig = result.oauth as { client_secret: string } & typeof result.oauth;
       try {
         result = {
diff --git a/packages/api/src/mcp/types/index.ts b/packages/api/src/mcp/types/index.ts
index 63a0153cad..270131036b 100644
--- a/packages/api/src/mcp/types/index.ts
+++ b/packages/api/src/mcp/types/index.ts
@@ -17,7 +17,8 @@ import type {
   Tool,
 } from '@modelcontextprotocol/sdk/types.js';
 import type { SearchResultData, UIResource, TPlugin } from 'librechat-data-provider';
-import type { TokenMethods, JsonSchemaType, IUser } from '@librechat/data-schemas';
+import type { TokenMethods, IUser } from '@librechat/data-schemas';
+import type { LCTool } from '@librechat/agents';
 import type { FlowStateManager } from '~/flow/manager';
 import type { RequestBody } from '~/types/http';
 import type * as o from '~/mcp/oauth/types';
@@ -42,11 +43,6 @@ export interface MCPResource {
   description?: string;
   mimeType?: string;
 }
-export interface LCTool {
-  name: string;
-  description?: string;
-  parameters: JsonSchemaType;
-}
 
 export interface LCFunctionTool {
   type: 'function';
@@ -170,10 +166,11 @@ export type AddServerResult = {
 export interface BasicConnectionOptions {
   serverName: string;
   serverConfig: MCPOptions;
+  useSSRFProtection?: boolean;
 }
 
 export interface OAuthConnectionOptions {
-  user: IUser;
+  user?: IUser;
   useOAuth: true;
   requestBody?: RequestBody;
   customUserVars?: Record<string, string>;
@@ -185,3 +182,21 @@ export interface OAuthConnectionOptions {
   returnOnOAuth?: boolean;
   connectionTimeout?: number;
 }
+
+export interface ToolDiscoveryOptions {
+  serverName: string;
+  user?: IUser;
+  flowManager?: FlowStateManager<o.MCPOAuthTokens | null>;
+  tokenMethods?: TokenMethods;
+  signal?: AbortSignal;
+  oauthStart?: (authURL: string) => Promise<void>;
+  customUserVars?: Record<string, string>;
+  requestBody?: RequestBody;
+  connectionTimeout?: number;
+}
+
+export interface ToolDiscoveryResult {
+  tools: Tool[] | null;
+  oauthRequired: boolean;
+  oauthUrl: string | null;
+}
diff --git a/packages/api/src/mcp/zod.ts b/packages/api/src/mcp/zod.ts
index ea9d17c0b2..53cb6e71a8 100644
--- a/packages/api/src/mcp/zod.ts
+++ b/packages/api/src/mcp/zod.ts
@@ -203,9 +203,9 @@ export function resolveJsonSchemaRefs<T extends Record<string, unknown>>(
   const result: Record<string, unknown> = {};
 
   for (const [key, value] of Object.entries(schema)) {
-    // Skip $defs/definitions at root level to avoid infinite recursion
-    if ((key === '$defs' || key === 'definitions') && !visited.size) {
-      result[key] = value;
+    // Skip $defs/definitions — they are only used for resolving $ref and
+    // should not appear in the resolved output (e.g. Google/Gemini API rejects them).
+    if (key === '$defs' || key === 'definitions') {
       continue;
     }
 
@@ -248,6 +248,89 @@ export function resolveJsonSchemaRefs<T extends Record<string, unknown>>(
   return result as T;
 }
 
+/**
+ * Recursively normalizes a JSON schema for LLM API compatibility.
+ *
+ * Transformations applied:
+ * - Converts `const` values to `enum` arrays (Gemini/Vertex AI rejects `const`)
+ * - Strips vendor extension fields (`x-*` prefixed keys, e.g. `x-google-enum-descriptions`)
+ * - Strips leftover `$defs`/`definitions` blocks that may survive ref resolution
+ *
+ * @param schema - The JSON schema to normalize
+ * @returns The normalized schema
+ */
+export function normalizeJsonSchema<T extends Record<string, unknown>>(schema: T): T {
+  if (!schema || typeof schema !== 'object') {
+    return schema;
+  }
+
+  if (Array.isArray(schema)) {
+    return schema.map((item) =>
+      item && typeof item === 'object' ? normalizeJsonSchema(item) : item,
+    ) as unknown as T;
+  }
+
+  const result: Record<string, unknown> = {};
+
+  for (const [key, value] of Object.entries(schema)) {
+    // Strip vendor extension fields (e.g. x-google-enum-descriptions) —
+    // these are valid in JSON Schema but rejected by Google/Gemini API.
+    if (key.startsWith('x-')) {
+      continue;
+    }
+
+    // Strip leftover $defs/definitions (should already be resolved by resolveJsonSchemaRefs,
+    // but strip as a safety net for schemas that bypass ref resolution).
+    if (key === '$defs' || key === 'definitions') {
+      continue;
+    }
+
+    if (key === 'const' && !('enum' in schema)) {
+      result['enum'] = [value];
+      continue;
+    }
+
+    if (key === 'const' && 'enum' in schema) {
+      // Skip `const` when `enum` already exists
+      continue;
+    }
+
+    if (key === 'properties' && value && typeof value === 'object' && !Array.isArray(value)) {
+      const newProps: Record<string, unknown> = {};
+      for (const [propKey, propValue] of Object.entries(value as Record<string, unknown>)) {
+        newProps[propKey] =
+          propValue && typeof propValue === 'object'
+            ? normalizeJsonSchema(propValue as Record<string, unknown>)
+            : propValue;
+      }
+      result[key] = newProps;
+    } else if (
+      (key === 'items' || key === 'additionalProperties') &&
+      value &&
+      typeof value === 'object'
+    ) {
+      result[key] = normalizeJsonSchema(value as Record<string, unknown>);
+    } else if ((key === 'oneOf' || key === 'anyOf' || key === 'allOf') && Array.isArray(value)) {
+      result[key] = value.map((item) =>
+        item && typeof item === 'object' ? normalizeJsonSchema(item) : item,
+      );
+    } else {
+      result[key] = value;
+    }
+  }
+
+  return result as T;
+}
+
+/**
+ * Converts a JSON Schema to a Zod schema.
+ *
+ * @deprecated This function is deprecated in favor of using JSON schemas directly.
+ * LangChain.js now supports JSON schemas natively, eliminating the need for Zod conversion.
+ * Use `resolveJsonSchemaRefs` to handle $ref references and pass the JSON schema directly to tools.
+ *
+ * @see https://js.langchain.com/docs/how_to/custom_tools/
+ */
 export function convertJsonSchemaToZod(
   schema: JsonSchemaType & Record<string, unknown>,
   options: ConvertJsonSchemaToZodOptions = {},
@@ -474,8 +557,13 @@ export function convertJsonSchemaToZod(
 }
 
 /**
- * Helper function for tests that automatically resolves refs before converting to Zod
- * This ensures all tests use resolveJsonSchemaRefs even when not explicitly testing it
+ * Helper function that resolves refs before converting to Zod.
+ *
+ * @deprecated This function is deprecated in favor of using JSON schemas directly.
+ * LangChain.js now supports JSON schemas natively, eliminating the need for Zod conversion.
+ * Use `resolveJsonSchemaRefs` to handle $ref references and pass the JSON schema directly to tools.
+ *
+ * @see https://js.langchain.com/docs/how_to/custom_tools/
  */
 export function convertWithResolvedRefs(
   schema: JsonSchemaType & Record<string, unknown>,
diff --git a/packages/api/src/middleware/__tests__/concurrency.cache_integration.spec.ts b/packages/api/src/middleware/__tests__/concurrency.cache_integration.spec.ts
new file mode 100644
index 0000000000..4c29fdad55
--- /dev/null
+++ b/packages/api/src/middleware/__tests__/concurrency.cache_integration.spec.ts
@@ -0,0 +1,258 @@
+import type { Redis, Cluster } from 'ioredis';
+
+/**
+ * Integration tests for concurrency middleware atomic Lua scripts.
+ *
+ * Tests that the Lua-based check-and-increment / decrement operations
+ * are truly atomic and eliminate the INCR+check+DECR race window.
+ *
+ * Run with: USE_REDIS=true npx jest --config packages/api/jest.config.js concurrency.cache_integration
+ */
+describe('Concurrency Middleware Integration Tests', () => {
+  let originalEnv: NodeJS.ProcessEnv;
+  let ioredisClient: Redis | Cluster | null = null;
+  let checkAndIncrementPendingRequest: (
+    userId: string,
+  ) => Promise<{ allowed: boolean; pendingRequests: number; limit: number }>;
+  let decrementPendingRequest: (userId: string) => Promise<void>;
+  const testPrefix = 'Concurrency-Integration-Test';
+
+  beforeAll(async () => {
+    originalEnv = { ...process.env };
+
+    process.env.USE_REDIS = process.env.USE_REDIS ?? 'true';
+    process.env.USE_REDIS_CLUSTER = process.env.USE_REDIS_CLUSTER ?? 'false';
+    process.env.REDIS_URI = process.env.REDIS_URI ?? 'redis://127.0.0.1:6379';
+    process.env.REDIS_KEY_PREFIX = testPrefix;
+    process.env.REDIS_PING_INTERVAL = '0';
+    process.env.REDIS_RETRY_MAX_ATTEMPTS = '5';
+    process.env.LIMIT_CONCURRENT_MESSAGES = 'true';
+    process.env.CONCURRENT_MESSAGE_MAX = '2';
+
+    jest.resetModules();
+
+    const { ioredisClient: client } = await import('../../cache/redisClients');
+    ioredisClient = client;
+
+    if (!ioredisClient) {
+      console.warn('Redis not available, skipping integration tests');
+      return;
+    }
+
+    // Import concurrency module after Redis client is available
+    const concurrency = await import('../concurrency');
+    checkAndIncrementPendingRequest = concurrency.checkAndIncrementPendingRequest;
+    decrementPendingRequest = concurrency.decrementPendingRequest;
+  });
+
+  afterEach(async () => {
+    if (!ioredisClient) {
+      return;
+    }
+
+    try {
+      const keys = await ioredisClient.keys(`${testPrefix}*`);
+      if (keys.length > 0) {
+        await Promise.all(keys.map((key) => ioredisClient!.del(key)));
+      }
+    } catch (error) {
+      console.warn('Error cleaning up test keys:', error);
+    }
+  });
+
+  afterAll(async () => {
+    if (ioredisClient) {
+      try {
+        await ioredisClient.quit();
+      } catch {
+        try {
+          ioredisClient.disconnect();
+        } catch {
+          // Ignore
+        }
+      }
+    }
+    process.env = originalEnv;
+  });
+
+  describe('Atomic Check and Increment', () => {
+    test('should allow requests within the concurrency limit', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-allow-${Date.now()}`;
+
+      // First request - should be allowed (count = 1, limit = 2)
+      const result1 = await checkAndIncrementPendingRequest(userId);
+      expect(result1.allowed).toBe(true);
+      expect(result1.pendingRequests).toBe(1);
+      expect(result1.limit).toBe(2);
+
+      // Second request - should be allowed (count = 2, limit = 2)
+      const result2 = await checkAndIncrementPendingRequest(userId);
+      expect(result2.allowed).toBe(true);
+      expect(result2.pendingRequests).toBe(2);
+    });
+
+    test('should reject requests over the concurrency limit', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-reject-${Date.now()}`;
+
+      // Fill up to the limit
+      await checkAndIncrementPendingRequest(userId);
+      await checkAndIncrementPendingRequest(userId);
+
+      // Third request - should be rejected (count would be 3, limit = 2)
+      const result = await checkAndIncrementPendingRequest(userId);
+      expect(result.allowed).toBe(false);
+      expect(result.pendingRequests).toBe(3); // Reports the count that was over-limit
+    });
+
+    test('should not leave stale counter after rejection (atomic rollback)', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-rollback-${Date.now()}`;
+
+      // Fill up to the limit
+      await checkAndIncrementPendingRequest(userId);
+      await checkAndIncrementPendingRequest(userId);
+
+      // Attempt over-limit (should be rejected and atomically rolled back)
+      const rejected = await checkAndIncrementPendingRequest(userId);
+      expect(rejected.allowed).toBe(false);
+
+      // The key value should still be 2, not 3 — verify the Lua script decremented back
+      const key = `PENDING_REQ:${userId}`;
+      const rawValue = await ioredisClient.get(key);
+      expect(rawValue).toBe('2');
+    });
+
+    test('should handle concurrent requests atomically (no over-admission)', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-concurrent-${Date.now()}`;
+
+      // Fire 20 concurrent requests for the same user (limit = 2)
+      const results = await Promise.all(
+        Array.from({ length: 20 }, () => checkAndIncrementPendingRequest(userId)),
+      );
+
+      const allowed = results.filter((r) => r.allowed);
+      const rejected = results.filter((r) => !r.allowed);
+
+      // Exactly 2 should be allowed (the concurrency limit)
+      expect(allowed.length).toBe(2);
+      expect(rejected.length).toBe(18);
+
+      // The key value should be exactly 2 after all atomic operations
+      const key = `PENDING_REQ:${userId}`;
+      const rawValue = await ioredisClient.get(key);
+      expect(rawValue).toBe('2');
+
+      // Clean up
+      await decrementPendingRequest(userId);
+      await decrementPendingRequest(userId);
+    });
+  });
+
+  describe('Atomic Decrement', () => {
+    test('should decrement pending requests', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-decrement-${Date.now()}`;
+
+      await checkAndIncrementPendingRequest(userId);
+      await checkAndIncrementPendingRequest(userId);
+
+      // Decrement once
+      await decrementPendingRequest(userId);
+
+      const key = `PENDING_REQ:${userId}`;
+      const rawValue = await ioredisClient.get(key);
+      expect(rawValue).toBe('1');
+    });
+
+    test('should clean up key when count reaches zero', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-cleanup-${Date.now()}`;
+
+      await checkAndIncrementPendingRequest(userId);
+      await decrementPendingRequest(userId);
+
+      // Key should be deleted (not left as "0")
+      const key = `PENDING_REQ:${userId}`;
+      const exists = await ioredisClient.exists(key);
+      expect(exists).toBe(0);
+    });
+
+    test('should clean up key on double-decrement (negative protection)', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-double-decr-${Date.now()}`;
+
+      await checkAndIncrementPendingRequest(userId);
+      await decrementPendingRequest(userId);
+      await decrementPendingRequest(userId); // Double-decrement
+
+      // Key should be deleted, not negative
+      const key = `PENDING_REQ:${userId}`;
+      const exists = await ioredisClient.exists(key);
+      expect(exists).toBe(0);
+    });
+
+    test('should allow new requests after decrement frees a slot', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-free-slot-${Date.now()}`;
+
+      // Fill to limit
+      await checkAndIncrementPendingRequest(userId);
+      await checkAndIncrementPendingRequest(userId);
+
+      // Verify at limit
+      const atLimit = await checkAndIncrementPendingRequest(userId);
+      expect(atLimit.allowed).toBe(false);
+
+      // Free a slot
+      await decrementPendingRequest(userId);
+
+      // Should now be allowed again
+      const allowed = await checkAndIncrementPendingRequest(userId);
+      expect(allowed.allowed).toBe(true);
+      expect(allowed.pendingRequests).toBe(2);
+    });
+  });
+
+  describe('TTL Behavior', () => {
+    test('should set TTL on the concurrency key', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const userId = `user-ttl-${Date.now()}`;
+      await checkAndIncrementPendingRequest(userId);
+
+      const key = `PENDING_REQ:${userId}`;
+      const ttl = await ioredisClient.ttl(key);
+      expect(ttl).toBeGreaterThan(0);
+      expect(ttl).toBeLessThanOrEqual(60);
+    });
+  });
+});
diff --git a/packages/api/src/middleware/admin.spec.ts b/packages/api/src/middleware/admin.spec.ts
new file mode 100644
index 0000000000..0074461cb4
--- /dev/null
+++ b/packages/api/src/middleware/admin.spec.ts
@@ -0,0 +1,140 @@
+import { logger } from '@librechat/data-schemas';
+import { SystemRoles } from 'librechat-data-provider';
+import { requireAdmin } from './admin';
+import type { Response } from 'express';
+import type { ServerRequest } from '~/types/http';
+
+jest.mock('@librechat/data-schemas', () => ({
+  ...jest.requireActual('@librechat/data-schemas'),
+  logger: {
+    warn: jest.fn(),
+    debug: jest.fn(),
+  },
+}));
+
+describe('requireAdmin middleware', () => {
+  let mockReq: Partial<ServerRequest>;
+  let mockRes: Partial<Response>;
+  let mockNext: jest.Mock;
+  let jsonMock: jest.Mock;
+  let statusMock: jest.Mock;
+
+  beforeEach(() => {
+    jsonMock = jest.fn();
+    statusMock = jest.fn().mockReturnValue({ json: jsonMock });
+
+    mockReq = {};
+    mockRes = {
+      status: statusMock,
+    };
+    mockNext = jest.fn();
+
+    (logger.warn as jest.Mock).mockClear();
+    (logger.debug as jest.Mock).mockClear();
+  });
+
+  describe('when no user is present', () => {
+    it('should return 401 with AUTHENTICATION_REQUIRED error', () => {
+      requireAdmin(mockReq as ServerRequest, mockRes as Response, mockNext);
+
+      expect(statusMock).toHaveBeenCalledWith(401);
+      expect(jsonMock).toHaveBeenCalledWith({
+        error: 'Authentication required',
+        error_code: 'AUTHENTICATION_REQUIRED',
+      });
+      expect(mockNext).not.toHaveBeenCalled();
+      expect(logger.warn).toHaveBeenCalledWith('[requireAdmin] No user found in request');
+    });
+
+    it('should return 401 when user is undefined', () => {
+      mockReq.user = undefined;
+
+      requireAdmin(mockReq as ServerRequest, mockRes as Response, mockNext);
+
+      expect(statusMock).toHaveBeenCalledWith(401);
+      expect(jsonMock).toHaveBeenCalledWith({
+        error: 'Authentication required',
+        error_code: 'AUTHENTICATION_REQUIRED',
+      });
+      expect(mockNext).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('when user does not have admin role', () => {
+    it('should return 403 when user has no role property', () => {
+      mockReq.user = { email: 'user@test.com' } as ServerRequest['user'];
+
+      requireAdmin(mockReq as ServerRequest, mockRes as Response, mockNext);
+
+      expect(statusMock).toHaveBeenCalledWith(403);
+      expect(jsonMock).toHaveBeenCalledWith({
+        error: 'Access denied: Admin privileges required',
+        error_code: 'ADMIN_REQUIRED',
+      });
+      expect(mockNext).not.toHaveBeenCalled();
+      expect(logger.debug).toHaveBeenCalledWith(
+        '[requireAdmin] Access denied for non-admin user: user@test.com',
+      );
+    });
+
+    it('should return 403 when user has USER role', () => {
+      mockReq.user = {
+        email: 'user@test.com',
+        role: SystemRoles.USER,
+      } as ServerRequest['user'];
+
+      requireAdmin(mockReq as ServerRequest, mockRes as Response, mockNext);
+
+      expect(statusMock).toHaveBeenCalledWith(403);
+      expect(jsonMock).toHaveBeenCalledWith({
+        error: 'Access denied: Admin privileges required',
+        error_code: 'ADMIN_REQUIRED',
+      });
+      expect(mockNext).not.toHaveBeenCalled();
+    });
+
+    it('should return 403 when user has empty string role', () => {
+      mockReq.user = {
+        email: 'user@test.com',
+        role: '',
+      } as ServerRequest['user'];
+
+      requireAdmin(mockReq as ServerRequest, mockRes as Response, mockNext);
+
+      expect(statusMock).toHaveBeenCalledWith(403);
+      expect(jsonMock).toHaveBeenCalledWith({
+        error: 'Access denied: Admin privileges required',
+        error_code: 'ADMIN_REQUIRED',
+      });
+      expect(mockNext).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('when user has admin role', () => {
+    it('should call next() and not send response', () => {
+      mockReq.user = {
+        email: 'admin@test.com',
+        role: SystemRoles.ADMIN,
+      } as ServerRequest['user'];
+
+      requireAdmin(mockReq as ServerRequest, mockRes as Response, mockNext);
+
+      expect(mockNext).toHaveBeenCalledTimes(1);
+      expect(mockNext).toHaveBeenCalledWith();
+      expect(statusMock).not.toHaveBeenCalled();
+      expect(jsonMock).not.toHaveBeenCalled();
+    });
+
+    it('should not log any warnings or debug messages for admin users', () => {
+      mockReq.user = {
+        email: 'admin@test.com',
+        role: SystemRoles.ADMIN,
+      } as ServerRequest['user'];
+
+      requireAdmin(mockReq as ServerRequest, mockRes as Response, mockNext);
+
+      expect(logger.warn).not.toHaveBeenCalled();
+      expect(logger.debug).not.toHaveBeenCalled();
+    });
+  });
+});
diff --git a/packages/api/src/middleware/admin.ts b/packages/api/src/middleware/admin.ts
new file mode 100644
index 0000000000..d770adfd85
--- /dev/null
+++ b/packages/api/src/middleware/admin.ts
@@ -0,0 +1,28 @@
+import { logger } from '@librechat/data-schemas';
+import { SystemRoles } from 'librechat-data-provider';
+import type { NextFunction, Response } from 'express';
+import type { ServerRequest } from '~/types/http';
+
+/**
+ * Middleware to check if authenticated user has admin role.
+ * Should be used AFTER authentication middleware (requireJwtAuth, requireLocalAuth, etc.)
+ */
+export const requireAdmin = (req: ServerRequest, res: Response, next: NextFunction) => {
+  if (!req.user) {
+    logger.warn('[requireAdmin] No user found in request');
+    return res.status(401).json({
+      error: 'Authentication required',
+      error_code: 'AUTHENTICATION_REQUIRED',
+    });
+  }
+
+  if (!req.user.role || req.user.role !== SystemRoles.ADMIN) {
+    logger.debug(`[requireAdmin] Access denied for non-admin user: ${req.user.email}`);
+    return res.status(403).json({
+      error: 'Access denied: Admin privileges required',
+      error_code: 'ADMIN_REQUIRED',
+    });
+  }
+
+  next();
+};
diff --git a/packages/api/src/middleware/concurrency.ts b/packages/api/src/middleware/concurrency.ts
index 92ac8b7d46..22302e79d0 100644
--- a/packages/api/src/middleware/concurrency.ts
+++ b/packages/api/src/middleware/concurrency.ts
@@ -9,6 +9,40 @@ const LIMIT_CONCURRENT_MESSAGES = process.env.LIMIT_CONCURRENT_MESSAGES;
 const CONCURRENT_MESSAGE_MAX = math(process.env.CONCURRENT_MESSAGE_MAX, 2);
 const CONCURRENT_VIOLATION_SCORE = math(process.env.CONCURRENT_VIOLATION_SCORE, 1);
 
+/**
+ * Lua script for atomic check-and-increment.
+ * Increments the key, sets TTL, and if over limit decrements back.
+ * Returns positive count if allowed, negative count if rejected.
+ * Single round-trip, fully atomic — eliminates the INCR/check/DECR race window.
+ */
+const CHECK_AND_INCREMENT_SCRIPT = `
+local key = KEYS[1]
+local limit = tonumber(ARGV[1])
+local ttl = tonumber(ARGV[2])
+local current = redis.call('INCR', key)
+redis.call('EXPIRE', key, ttl)
+if current > limit then
+  redis.call('DECR', key)
+  return -current
+end
+return current
+`;
+
+/**
+ * Lua script for atomic decrement-and-cleanup.
+ * Decrements the key and deletes it if the count reaches zero or below.
+ * Eliminates the DECR-then-DEL race window.
+ */
+const DECREMENT_SCRIPT = `
+local key = KEYS[1]
+local current = redis.call('DECR', key)
+if current <= 0 then
+  redis.call('DEL', key)
+  return 0
+end
+return current
+`;
+
 /** Lazily initialized cache for pending requests (used only for in-memory fallback) */
 let pendingReqCache: ReturnType<typeof standardCache> | null = null;
 
@@ -80,36 +114,28 @@ export async function checkAndIncrementPendingRequest(
     return { allowed: true, pendingRequests: 0, limit };
   }
 
-  // Use atomic Redis INCR when available to prevent race conditions
+  // Use atomic Lua script when Redis is available to prevent race conditions.
+  // A single EVAL round-trip atomically increments, checks, and decrements if over-limit.
   if (USE_REDIS && ioredisClient) {
     const key = buildKey(userId);
     try {
-      // Pipeline ensures INCR and EXPIRE execute atomically in one round-trip
-      // This prevents edge cases where crash between operations leaves key without TTL
-      const pipeline = ioredisClient.pipeline();
-      pipeline.incr(key);
-      pipeline.expire(key, 60);
-      const results = await pipeline.exec();
+      const result = (await ioredisClient.eval(
+        CHECK_AND_INCREMENT_SCRIPT,
+        1,
+        key,
+        limit,
+        60,
+      )) as number;
 
-      if (!results || results[0][0]) {
-        throw new Error('Pipeline execution failed');
+      if (result < 0) {
+        // Negative return means over-limit (absolute value is the count before decrement)
+        const count = -result;
+        logger.debug(`[concurrency] User ${userId} exceeded concurrent limit: ${count}/${limit}`);
+        return { allowed: false, pendingRequests: count, limit };
       }
 
-      const newCount = results[0][1] as number;
-
-      if (newCount > limit) {
-        // Over limit - decrement back and reject
-        await ioredisClient.decr(key);
-        logger.debug(
-          `[concurrency] User ${userId} exceeded concurrent limit: ${newCount}/${limit}`,
-        );
-        return { allowed: false, pendingRequests: newCount, limit };
-      }
-
-      logger.debug(
-        `[concurrency] User ${userId} incremented pending requests: ${newCount}/${limit}`,
-      );
-      return { allowed: true, pendingRequests: newCount, limit };
+      logger.debug(`[concurrency] User ${userId} incremented pending requests: ${result}/${limit}`);
+      return { allowed: true, pendingRequests: result, limit };
     } catch (error) {
       logger.error('[concurrency] Redis atomic increment failed:', error);
       // On Redis error, allow the request to proceed (fail-open)
@@ -164,18 +190,12 @@ export async function decrementPendingRequest(userId: string): Promise<void> {
       return;
     }
 
-    // Use atomic Redis DECR when available
+    // Use atomic Lua script to decrement and clean up zero/negative keys in one round-trip
     if (USE_REDIS && ioredisClient) {
       const key = buildKey(userId);
       try {
-        const newCount = await ioredisClient.decr(key);
-        if (newCount < 0) {
-          // Counter went negative - reset to 0 and delete
-          await ioredisClient.del(key);
-          logger.debug(`[concurrency] User ${userId} pending requests cleared (was negative)`);
-        } else if (newCount === 0) {
-          // Clean up zero-value keys
-          await ioredisClient.del(key);
+        const newCount = (await ioredisClient.eval(DECREMENT_SCRIPT, 1, key)) as number;
+        if (newCount === 0) {
           logger.debug(`[concurrency] User ${userId} pending requests cleared`);
         } else {
           logger.debug(`[concurrency] User ${userId} decremented pending requests: ${newCount}`);
diff --git a/packages/api/src/middleware/index.ts b/packages/api/src/middleware/index.ts
index 4398b35e14..a208923a49 100644
--- a/packages/api/src/middleware/index.ts
+++ b/packages/api/src/middleware/index.ts
@@ -1,4 +1,5 @@
 export * from './access';
+export * from './admin';
 export * from './error';
 export * from './balance';
 export * from './json';
diff --git a/packages/api/src/oauth/csrf.spec.ts b/packages/api/src/oauth/csrf.spec.ts
new file mode 100644
index 0000000000..b56f1fd38f
--- /dev/null
+++ b/packages/api/src/oauth/csrf.spec.ts
@@ -0,0 +1,99 @@
+import { shouldUseSecureCookie } from './csrf';
+
+describe('shouldUseSecureCookie', () => {
+  const originalEnv = process.env;
+
+  beforeEach(() => {
+    process.env = { ...originalEnv };
+  });
+
+  afterAll(() => {
+    process.env = originalEnv;
+  });
+
+  it('should return true in production with a non-localhost domain', () => {
+    process.env.NODE_ENV = 'production';
+    process.env.DOMAIN_SERVER = 'https://myapp.example.com';
+    expect(shouldUseSecureCookie()).toBe(true);
+  });
+
+  it('should return false in development regardless of domain', () => {
+    process.env.NODE_ENV = 'development';
+    process.env.DOMAIN_SERVER = 'https://myapp.example.com';
+    expect(shouldUseSecureCookie()).toBe(false);
+  });
+
+  it('should return false when NODE_ENV is not set', () => {
+    delete process.env.NODE_ENV;
+    process.env.DOMAIN_SERVER = 'https://myapp.example.com';
+    expect(shouldUseSecureCookie()).toBe(false);
+  });
+
+  describe('localhost detection in production', () => {
+    beforeEach(() => {
+      process.env.NODE_ENV = 'production';
+    });
+
+    it('should return false for http://localhost:3080', () => {
+      process.env.DOMAIN_SERVER = 'http://localhost:3080';
+      expect(shouldUseSecureCookie()).toBe(false);
+    });
+
+    it('should return false for https://localhost:3080', () => {
+      process.env.DOMAIN_SERVER = 'https://localhost:3080';
+      expect(shouldUseSecureCookie()).toBe(false);
+    });
+
+    it('should return false for http://localhost (no port)', () => {
+      process.env.DOMAIN_SERVER = 'http://localhost';
+      expect(shouldUseSecureCookie()).toBe(false);
+    });
+
+    it('should return false for http://127.0.0.1:3080', () => {
+      process.env.DOMAIN_SERVER = 'http://127.0.0.1:3080';
+      expect(shouldUseSecureCookie()).toBe(false);
+    });
+
+    it('should return true for http://[::1]:3080 (IPv6 loopback — not detected due to URL bracket parsing)', () => {
+      // Known limitation: new URL('http://[::1]:3080').hostname returns '[::1]' (with brackets)
+      // but the check compares against '::1' (without brackets). IPv6 localhost is rare in practice.
+      process.env.DOMAIN_SERVER = 'http://[::1]:3080';
+      expect(shouldUseSecureCookie()).toBe(true);
+    });
+
+    it('should return false for subdomain of localhost', () => {
+      process.env.DOMAIN_SERVER = 'http://app.localhost:3080';
+      expect(shouldUseSecureCookie()).toBe(false);
+    });
+
+    it('should return true for a domain containing "localhost" as a substring but not as hostname', () => {
+      process.env.DOMAIN_SERVER = 'https://notlocalhost.example.com';
+      expect(shouldUseSecureCookie()).toBe(true);
+    });
+
+    it('should return true for a regular production domain', () => {
+      process.env.DOMAIN_SERVER = 'https://chat.example.com';
+      expect(shouldUseSecureCookie()).toBe(true);
+    });
+
+    it('should return true when DOMAIN_SERVER is empty (conservative default)', () => {
+      process.env.DOMAIN_SERVER = '';
+      expect(shouldUseSecureCookie()).toBe(true);
+    });
+
+    it('should return true when DOMAIN_SERVER is not set (conservative default)', () => {
+      delete process.env.DOMAIN_SERVER;
+      expect(shouldUseSecureCookie()).toBe(true);
+    });
+
+    it('should handle DOMAIN_SERVER without protocol prefix', () => {
+      process.env.DOMAIN_SERVER = 'localhost:3080';
+      expect(shouldUseSecureCookie()).toBe(false);
+    });
+
+    it('should handle case-insensitive hostnames', () => {
+      process.env.DOMAIN_SERVER = 'http://LOCALHOST:3080';
+      expect(shouldUseSecureCookie()).toBe(false);
+    });
+  });
+});
diff --git a/packages/api/src/oauth/csrf.ts b/packages/api/src/oauth/csrf.ts
new file mode 100644
index 0000000000..6ed63968d1
--- /dev/null
+++ b/packages/api/src/oauth/csrf.ts
@@ -0,0 +1,119 @@
+import crypto from 'crypto';
+import type { Request, Response, NextFunction } from 'express';
+
+export const OAUTH_CSRF_COOKIE = 'oauth_csrf';
+export const OAUTH_CSRF_MAX_AGE = 10 * 60 * 1000;
+
+export const OAUTH_SESSION_COOKIE = 'oauth_session';
+export const OAUTH_SESSION_MAX_AGE = 24 * 60 * 60 * 1000;
+export const OAUTH_SESSION_COOKIE_PATH = '/api';
+
+/**
+ * Determines if secure cookies should be used.
+ * Returns `true` in production unless the server is running on localhost (HTTP).
+ * This allows cookies to work on `http://localhost` during local development
+ * even when `NODE_ENV=production` (common in Docker Compose setups).
+ */
+export function shouldUseSecureCookie(): boolean {
+  const isProduction = process.env.NODE_ENV === 'production';
+  const domainServer = process.env.DOMAIN_SERVER || '';
+
+  let hostname = '';
+  if (domainServer) {
+    try {
+      const normalized = /^https?:\/\//i.test(domainServer)
+        ? domainServer
+        : `http://${domainServer}`;
+      const url = new URL(normalized);
+      hostname = (url.hostname || '').toLowerCase();
+    } catch {
+      hostname = domainServer.toLowerCase();
+    }
+  }
+
+  const isLocalhost =
+    hostname === 'localhost' ||
+    hostname === '127.0.0.1' ||
+    hostname === '::1' ||
+    hostname.endsWith('.localhost');
+
+  return isProduction && !isLocalhost;
+}
+
+/** Generates an HMAC-based token for OAuth CSRF protection */
+export function generateOAuthCsrfToken(flowId: string, secret?: string): string {
+  const key = secret || process.env.JWT_SECRET;
+  if (!key) {
+    throw new Error('JWT_SECRET is required for OAuth CSRF token generation');
+  }
+  return crypto.createHmac('sha256', key).update(flowId).digest('hex').slice(0, 32);
+}
+
+/** Sets a SameSite=Lax CSRF cookie bound to a specific OAuth flow */
+export function setOAuthCsrfCookie(res: Response, flowId: string, cookiePath: string): void {
+  res.cookie(OAUTH_CSRF_COOKIE, generateOAuthCsrfToken(flowId), {
+    httpOnly: true,
+    secure: shouldUseSecureCookie(),
+    sameSite: 'lax',
+    maxAge: OAUTH_CSRF_MAX_AGE,
+    path: cookiePath,
+  });
+}
+
+/**
+ * Validates the per-flow CSRF cookie against the expected HMAC.
+ * Uses timing-safe comparison and always clears the cookie to prevent replay.
+ */
+export function validateOAuthCsrf(
+  req: Request,
+  res: Response,
+  flowId: string,
+  cookiePath: string,
+): boolean {
+  const cookie = (req.cookies as Record<string, string> | undefined)?.[OAUTH_CSRF_COOKIE];
+  res.clearCookie(OAUTH_CSRF_COOKIE, { path: cookiePath });
+  if (!cookie) {
+    return false;
+  }
+  const expected = generateOAuthCsrfToken(flowId);
+  if (cookie.length !== expected.length) {
+    return false;
+  }
+  return crypto.timingSafeEqual(Buffer.from(cookie), Buffer.from(expected));
+}
+
+/**
+ * Express middleware that sets the OAuth session cookie after JWT authentication.
+ * Chain after requireJwtAuth on routes that precede an OAuth redirect (e.g., reinitialize, bind).
+ */
+export function setOAuthSession(req: Request, res: Response, next: NextFunction): void {
+  const user = (req as Request & { user?: { id?: string } }).user;
+  if (user?.id && !(req.cookies as Record<string, string> | undefined)?.[OAUTH_SESSION_COOKIE]) {
+    setOAuthSessionCookie(res, user.id);
+  }
+  next();
+}
+
+/** Sets a SameSite=Lax session cookie that binds the browser to the authenticated userId */
+export function setOAuthSessionCookie(res: Response, userId: string): void {
+  res.cookie(OAUTH_SESSION_COOKIE, generateOAuthCsrfToken(userId), {
+    httpOnly: true,
+    secure: shouldUseSecureCookie(),
+    sameSite: 'lax',
+    maxAge: OAUTH_SESSION_MAX_AGE,
+    path: OAUTH_SESSION_COOKIE_PATH,
+  });
+}
+
+/** Validates the session cookie against the expected userId using timing-safe comparison */
+export function validateOAuthSession(req: Request, userId: string): boolean {
+  const cookie = (req.cookies as Record<string, string> | undefined)?.[OAUTH_SESSION_COOKIE];
+  if (!cookie) {
+    return false;
+  }
+  const expected = generateOAuthCsrfToken(userId);
+  if (cookie.length !== expected.length) {
+    return false;
+  }
+  return crypto.timingSafeEqual(Buffer.from(cookie), Buffer.from(expected));
+}
diff --git a/packages/api/src/oauth/index.ts b/packages/api/src/oauth/index.ts
index e56053c166..01be92b6e3 100644
--- a/packages/api/src/oauth/index.ts
+++ b/packages/api/src/oauth/index.ts
@@ -1 +1,2 @@
+export * from './csrf';
 export * from './tokens';
diff --git a/packages/api/src/stream/GenerationJobManager.ts b/packages/api/src/stream/GenerationJobManager.ts
index 44b38f48f6..815133d616 100644
--- a/packages/api/src/stream/GenerationJobManager.ts
+++ b/packages/api/src/stream/GenerationJobManager.ts
@@ -1,9 +1,11 @@
 import { logger } from '@librechat/data-schemas';
 import type { StandardGraph } from '@librechat/agents';
-import type { Agents } from 'librechat-data-provider';
+import { parseTextParts } from 'librechat-data-provider';
+import type { Agents, TMessageContentParts } from 'librechat-data-provider';
 import type {
   SerializableJobData,
   IEventTransport,
+  UsageMetadata,
   AbortResult,
   IJobStore,
 } from './interfaces/IJobStore';
@@ -33,6 +35,7 @@ export interface GenerationJobManagerOptions {
  * @property readyPromise - Resolves immediately (legacy, kept for API compatibility)
  * @property resolveReady - Function to resolve readyPromise
  * @property finalEvent - Cached final event for late subscribers
+ * @property errorEvent - Cached error event for late subscribers (errors before client connects)
  * @property syncSent - Whether sync event was sent (reset when all subscribers leave)
  * @property earlyEventBuffer - Buffer for events emitted before first subscriber connects
  * @property hasSubscriber - Whether at least one subscriber has connected
@@ -47,6 +50,7 @@ interface RuntimeJobState {
   readyPromise: Promise<void>;
   resolveReady: () => void;
   finalEvent?: t.ServerSentEvent;
+  errorEvent?: string;
   syncSent: boolean;
   earlyEventBuffer: t.ServerSentEvent[];
   hasSubscriber: boolean;
@@ -234,6 +238,7 @@ class GenerationJobManagerClass {
       const currentRuntime = this.runtimeState.get(streamId);
       if (currentRuntime) {
         currentRuntime.syncSent = false;
+        currentRuntime.hasSubscriber = false;
         // Persist syncSent=false to Redis for cross-replica consistency
         this.jobStore.updateJob(streamId, { syncSent: false }).catch((err) => {
           logger.error(`[GenerationJobManager] Failed to persist syncSent=false:`, err);
@@ -421,6 +426,7 @@ class GenerationJobManagerClass {
       earlyEventBuffer: [],
       hasSubscriber: false,
       finalEvent,
+      errorEvent: jobData.error,
     };
 
     this.runtimeState.set(streamId, runtime);
@@ -430,6 +436,7 @@ class GenerationJobManagerClass {
       const currentRuntime = this.runtimeState.get(streamId);
       if (currentRuntime) {
         currentRuntime.syncSent = false;
+        currentRuntime.hasSubscriber = false;
         // Persist syncSent=false to Redis
         this.jobStore.updateJob(streamId, { syncSent: false }).catch((err) => {
           logger.error(`[GenerationJobManager] Failed to persist syncSent=false:`, err);
@@ -510,6 +517,8 @@ class GenerationJobManagerClass {
   /**
    * Mark job as complete.
    * If cleanupOnComplete is true (default), immediately cleans up job resources.
+   * Exception: Jobs with errors are NOT immediately deleted to allow late-connecting
+   * clients to receive the error (race condition where error occurs before client connects).
    * Note: eventTransport is NOT cleaned up here to allow the final event to be
    * fully transmitted. It will be cleaned up when subscribers disconnect or
    * by the periodic cleanup job.
@@ -527,7 +536,29 @@ class GenerationJobManagerClass {
     this.jobStore.clearContentState(streamId);
     this.runStepBuffers?.delete(streamId);
 
-    // Immediate cleanup if configured (default: true)
+    // For error jobs, DON'T delete immediately - keep around so late-connecting
+    // clients can receive the error. This handles the race condition where error
+    // occurs before client connects to SSE stream.
+    //
+    // Cleanup strategy: Error jobs are cleaned up by periodic cleanup (every 60s)
+    // via jobStore.cleanup() which checks for jobs with status 'error' and
+    // completedAt set. The TTL is configurable via jobStore options (default: 0,
+    // meaning cleanup on next interval). This gives clients ~60s to connect and
+    // receive the error before the job is removed.
+    if (error) {
+      await this.jobStore.updateJob(streamId, {
+        status: 'error',
+        completedAt: Date.now(),
+        error,
+      });
+      // Keep runtime state so subscribe() can access errorEvent
+      logger.debug(
+        `[GenerationJobManager] Job completed with error (keeping for late subscribers): ${streamId}`,
+      );
+      return;
+    }
+
+    // Immediate cleanup if configured (default: true) - only for successful completions
     if (this._cleanupOnComplete) {
       this.runtimeState.delete(streamId);
       // Don't cleanup eventTransport here - let the done event fully transmit first.
@@ -536,9 +567,8 @@ class GenerationJobManagerClass {
     } else {
       // Only update status if keeping the job around
       await this.jobStore.updateJob(streamId, {
-        status: error ? 'error' : 'complete',
+        status: 'complete',
         completedAt: Date.now(),
-        error,
       });
     }
 
@@ -559,7 +589,14 @@ class GenerationJobManagerClass {
 
     if (!jobData) {
       logger.warn(`[GenerationJobManager] Cannot abort - job not found: ${streamId}`);
-      return { success: false, jobData: null, content: [], finalEvent: null };
+      return {
+        text: '',
+        content: [],
+        jobData: null,
+        success: false,
+        finalEvent: null,
+        collectedUsage: [],
+      };
     }
 
     // Emit abort signal for cross-replica support (Redis mode)
@@ -573,15 +610,21 @@ class GenerationJobManagerClass {
       runtime.abortController.abort();
     }
 
-    // Get content before clearing state
+    /** Content before clearing state */
     const result = await this.jobStore.getContentParts(streamId);
     const content = result?.content ?? [];
 
-    // Detect "early abort" - aborted before any generation happened (e.g., during tool loading)
-    // In this case, no messages were saved to DB, so frontend shouldn't navigate to conversation
+    /** Collected usage for all models */
+    const collectedUsage = this.jobStore.getCollectedUsage(streamId);
+
+    /** Text from content parts for fallback token counting */
+    const text = parseTextParts(content as TMessageContentParts[]);
+
+    /** Detect "early abort" - aborted before any generation happened (e.g., during tool loading)
+    In this case, no messages were saved to DB, so frontend shouldn't navigate to conversation */
     const isEarlyAbort = content.length === 0 && !jobData.responseMessageId;
 
-    // Create final event for abort
+    /** Final event for abort */
     const userMessageId = jobData.userMessage?.messageId;
 
     const abortFinalEvent: t.ServerSentEvent = {
@@ -619,7 +662,7 @@ class GenerationJobManagerClass {
       runtime.finalEvent = abortFinalEvent;
     }
 
-    this.eventTransport.emitDone(streamId, abortFinalEvent);
+    await this.eventTransport.emitDone(streamId, abortFinalEvent);
     this.jobStore.clearContentState(streamId);
     this.runStepBuffers?.delete(streamId);
 
@@ -643,6 +686,8 @@ class GenerationJobManagerClass {
       jobData,
       content,
       finalEvent: abortFinalEvent,
+      text,
+      collectedUsage,
     };
   }
 
@@ -678,21 +723,28 @@ class GenerationJobManagerClass {
 
     const jobData = await this.jobStore.getJob(streamId);
 
-    // If job already complete, send final event
+    // If job already complete/error, send final event or error
+    // Error status takes precedence to ensure errors aren't misreported as successes
     setImmediate(() => {
-      if (
-        runtime.finalEvent &&
-        jobData &&
-        ['complete', 'error', 'aborted'].includes(jobData.status)
-      ) {
-        onDone?.(runtime.finalEvent);
+      if (jobData && ['complete', 'error', 'aborted'].includes(jobData.status)) {
+        // Check for error status FIRST and prioritize error handling
+        if (jobData.status === 'error' && (runtime.errorEvent || jobData.error)) {
+          const errorToSend = runtime.errorEvent ?? jobData.error;
+          if (errorToSend) {
+            logger.debug(
+              `[GenerationJobManager] Sending stored error to late subscriber: ${streamId}`,
+            );
+            onError?.(errorToSend);
+          }
+        } else if (runtime.finalEvent) {
+          onDone?.(runtime.finalEvent);
+        }
       }
     });
 
     const subscription = this.eventTransport.subscribe(streamId, {
       onChunk: (event) => {
         const e = event as t.ServerSentEvent;
-        // Filter out internal events
         if (!(e as Record<string, unknown>)._internal) {
           onChunk(e);
         }
@@ -701,14 +753,15 @@ class GenerationJobManagerClass {
       onError,
     });
 
-    // Check if this is the first subscriber
+    if (subscription.ready) {
+      await subscription.ready;
+    }
+
     const isFirst = this.eventTransport.isFirstSubscriber(streamId);
 
-    // First subscriber: replay buffered events and mark as connected
     if (!runtime.hasSubscriber) {
       runtime.hasSubscriber = true;
 
-      // Replay any events that were emitted before subscriber connected
       if (runtime.earlyEventBuffer.length > 0) {
         logger.debug(
           `[GenerationJobManager] Replaying ${runtime.earlyEventBuffer.length} buffered events for ${streamId}`,
@@ -716,9 +769,10 @@ class GenerationJobManagerClass {
         for (const bufferedEvent of runtime.earlyEventBuffer) {
           onChunk(bufferedEvent);
         }
-        // Clear buffer after replay
         runtime.earlyEventBuffer = [];
       }
+
+      this.eventTransport.syncReorderBuffer?.(streamId);
     }
 
     if (isFirst) {
@@ -737,8 +791,11 @@ class GenerationJobManagerClass {
    *
    * If no subscriber has connected yet, buffers the event for replay when they do.
    * This ensures early events (like 'created') aren't lost due to race conditions.
+   *
+   * In Redis mode, awaits the publish to guarantee event ordering.
+   * This is critical for streaming deltas (tool args, message content) to arrive in order.
    */
-  emitChunk(streamId: string, event: t.ServerSentEvent): void {
+  async emitChunk(streamId: string, event: t.ServerSentEvent): Promise<void> {
     const runtime = this.runtimeState.get(streamId);
     if (!runtime || runtime.abortController.signal.aborted) {
       return;
@@ -747,7 +804,7 @@ class GenerationJobManagerClass {
     // Track user message from created event
     this.trackUserMessage(streamId, event);
 
-    // For Redis mode, persist chunk for later reconstruction
+    // For Redis mode, persist chunk for later reconstruction (fire-and-forget for resumability)
     if (this._isRedis) {
       // The SSE event structure is { event: string, data: unknown, ... }
       // The aggregator expects { event: string, data: unknown } where data is the payload
@@ -768,13 +825,14 @@ class GenerationJobManagerClass {
       }
     }
 
-    // Buffer early events if no subscriber yet (replay when first subscriber connects)
     if (!runtime.hasSubscriber) {
       runtime.earlyEventBuffer.push(event);
-      // Also emit to transport in case subscriber connects mid-flight
+      if (!this._isRedis) {
+        return;
+      }
     }
 
-    this.eventTransport.emitChunk(streamId, event);
+    await this.eventTransport.emitChunk(streamId, event);
   }
 
   /**
@@ -899,6 +957,18 @@ class GenerationJobManagerClass {
     this.jobStore.setContentParts(streamId, contentParts);
   }
 
+  /**
+   * Set reference to the collectedUsage array.
+   * This array accumulates token usage from all models during generation.
+   */
+  setCollectedUsage(streamId: string, collectedUsage: UsageMetadata[]): void {
+    // Use runtime state check for performance (sync check)
+    if (!this.runtimeState.has(streamId)) {
+      return;
+    }
+    this.jobStore.setCollectedUsage(streamId, collectedUsage);
+  }
+
   /**
    * Set reference to the graph instance.
    */
@@ -972,7 +1042,7 @@ class GenerationJobManagerClass {
    * Emit a done event.
    * Persists finalEvent to Redis for cross-replica access.
    */
-  emitDone(streamId: string, event: t.ServerSentEvent): void {
+  async emitDone(streamId: string, event: t.ServerSentEvent): Promise<void> {
     const runtime = this.runtimeState.get(streamId);
     if (runtime) {
       runtime.finalEvent = event;
@@ -981,14 +1051,24 @@ class GenerationJobManagerClass {
     this.jobStore.updateJob(streamId, { finalEvent: JSON.stringify(event) }).catch((err) => {
       logger.error(`[GenerationJobManager] Failed to persist finalEvent:`, err);
     });
-    this.eventTransport.emitDone(streamId, event);
+    await this.eventTransport.emitDone(streamId, event);
   }
 
   /**
    * Emit an error event.
+   * Stores the error for late-connecting subscribers (race condition where error
+   * occurs before client connects to SSE stream).
    */
-  emitError(streamId: string, error: string): void {
-    this.eventTransport.emitError(streamId, error);
+  async emitError(streamId: string, error: string): Promise<void> {
+    const runtime = this.runtimeState.get(streamId);
+    if (runtime) {
+      runtime.errorEvent = error;
+    }
+    // Persist error to job store for cross-replica consistency
+    this.jobStore.updateJob(streamId, { error }).catch((err) => {
+      logger.error(`[GenerationJobManager] Failed to persist error:`, err);
+    });
+    await this.eventTransport.emitError(streamId, error);
   }
 
   /**
diff --git a/packages/api/src/stream/__tests__/GenerationJobManager.stream_integration.spec.ts b/packages/api/src/stream/__tests__/GenerationJobManager.stream_integration.spec.ts
index 4471d8c95d..59fe32e4e5 100644
--- a/packages/api/src/stream/__tests__/GenerationJobManager.stream_integration.spec.ts
+++ b/packages/api/src/stream/__tests__/GenerationJobManager.stream_integration.spec.ts
@@ -1,4 +1,17 @@
 import type { Redis, Cluster } from 'ioredis';
+import type { ServerSentEvent } from '~/types/events';
+import { InMemoryEventTransport } from '~/stream/implementations/InMemoryEventTransport';
+import { RedisEventTransport } from '~/stream/implementations/RedisEventTransport';
+import { InMemoryJobStore } from '~/stream/implementations/InMemoryJobStore';
+import { GenerationJobManagerClass } from '~/stream/GenerationJobManager';
+import { RedisJobStore } from '~/stream/implementations/RedisJobStore';
+import { createStreamServices } from '~/stream/createStreamServices';
+import { GenerationJobManager } from '~/stream/GenerationJobManager';
+import {
+  ioredisClient as staticRedisClient,
+  keyvRedisClient as staticKeyvClient,
+  keyvRedisClientReady,
+} from '~/cache/redisClients';
 
 /**
  * Integration tests for GenerationJobManager.
@@ -11,20 +24,23 @@ import type { Redis, Cluster } from 'ioredis';
 describe('GenerationJobManager Integration Tests', () => {
   let originalEnv: NodeJS.ProcessEnv;
   let ioredisClient: Redis | Cluster | null = null;
+  let dynamicKeyvClient: unknown = null;
+  let dynamicKeyvReady: Promise<unknown> | null = null;
   const testPrefix = 'JobManager-Integration-Test';
 
   beforeAll(async () => {
     originalEnv = { ...process.env };
 
-    // Set up test environment
     process.env.USE_REDIS = process.env.USE_REDIS ?? 'true';
     process.env.REDIS_URI = process.env.REDIS_URI ?? 'redis://127.0.0.1:6379';
     process.env.REDIS_KEY_PREFIX = testPrefix;
 
     jest.resetModules();
 
-    const { ioredisClient: client } = await import('../../cache/redisClients');
-    ioredisClient = client;
+    const redisModule = await import('~/cache/redisClients');
+    ioredisClient = redisModule.ioredisClient;
+    dynamicKeyvClient = redisModule.keyvRedisClient;
+    dynamicKeyvReady = redisModule.keyvRedisClientReady;
   });
 
   afterEach(async () => {
@@ -45,28 +61,29 @@ describe('GenerationJobManager Integration Tests', () => {
   });
 
   afterAll(async () => {
-    if (ioredisClient) {
-      try {
-        // Use quit() to gracefully close - waits for pending commands
-        await ioredisClient.quit();
-      } catch {
-        // Fall back to disconnect if quit fails
-        try {
-          ioredisClient.disconnect();
-        } catch {
-          // Ignore
-        }
+    for (const ready of [keyvRedisClientReady, dynamicKeyvReady]) {
+      if (ready) {
+        await ready.catch(() => {});
       }
     }
+
+    const clients = [ioredisClient, staticRedisClient, staticKeyvClient, dynamicKeyvClient];
+    for (const client of clients) {
+      if (!client) {
+        continue;
+      }
+      try {
+        await (client as { disconnect: () => void | Promise<void> }).disconnect();
+      } catch {
+        /* ignore */
+      }
+    }
+
     process.env = originalEnv;
   });
 
   describe('In-Memory Mode', () => {
     test('should create and manage jobs', async () => {
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
-      const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
-
       // Configure with in-memory
       // cleanupOnComplete: false so we can verify completed status
       GenerationJobManager.configure({
@@ -76,7 +93,7 @@ describe('GenerationJobManager Integration Tests', () => {
         cleanupOnComplete: false,
       });
 
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `inmem-job-${Date.now()}`;
       const userId = 'test-user-1';
@@ -108,17 +125,13 @@ describe('GenerationJobManager Integration Tests', () => {
     });
 
     test('should handle event streaming', async () => {
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
-      const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
-
       GenerationJobManager.configure({
         jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
         eventTransport: new InMemoryEventTransport(),
         isRedis: false,
       });
 
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `inmem-events-${Date.now()}`;
       await GenerationJobManager.createJob(streamId, 'user-1');
@@ -134,12 +147,12 @@ describe('GenerationJobManager Integration Tests', () => {
       // Wait for first subscriber to be registered
       await new Promise((resolve) => setTimeout(resolve, 10));
 
-      // Emit chunks (emitChunk takes { event, data } format)
-      GenerationJobManager.emitChunk(streamId, {
+      // Emit chunks (emitChunk takes { event, data } format, now async for Redis ordering)
+      await GenerationJobManager.emitChunk(streamId, {
         event: 'on_message_delta',
         data: { type: 'text', text: 'Hello' },
       });
-      GenerationJobManager.emitChunk(streamId, {
+      await GenerationJobManager.emitChunk(streamId, {
         event: 'on_message_delta',
         data: { type: 'text', text: ' world' },
       });
@@ -165,9 +178,6 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { createStreamServices } = await import('../createStreamServices');
-
       // Create Redis services
       const services = createStreamServices({
         useRedis: true,
@@ -177,7 +187,7 @@ describe('GenerationJobManager Integration Tests', () => {
       expect(services.isRedis).toBe(true);
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `redis-job-${Date.now()}`;
       const userId = 'test-user-redis';
@@ -204,23 +214,20 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { createStreamServices } = await import('../createStreamServices');
-
       const services = createStreamServices({
         useRedis: true,
         redisClient: ioredisClient,
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `redis-chunks-${Date.now()}`;
       await GenerationJobManager.createJob(streamId, 'user-1');
 
       // Emit chunks (these should be persisted to Redis)
-      // emitChunk takes { event, data } format
-      GenerationJobManager.emitChunk(streamId, {
+      // emitChunk takes { event, data } format, now async for Redis ordering
+      await GenerationJobManager.emitChunk(streamId, {
         event: 'on_run_step',
         data: {
           id: 'step-1',
@@ -229,14 +236,14 @@ describe('GenerationJobManager Integration Tests', () => {
           stepDetails: { type: 'message_creation' },
         },
       });
-      GenerationJobManager.emitChunk(streamId, {
+      await GenerationJobManager.emitChunk(streamId, {
         event: 'on_message_delta',
         data: {
           id: 'step-1',
           delta: { content: { type: 'text', text: 'Persisted ' } },
         },
       });
-      GenerationJobManager.emitChunk(streamId, {
+      await GenerationJobManager.emitChunk(streamId, {
         event: 'on_message_delta',
         data: {
           id: 'step-1',
@@ -262,22 +269,19 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { createStreamServices } = await import('../createStreamServices');
-
       const services = createStreamServices({
         useRedis: true,
         redisClient: ioredisClient,
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `redis-abort-${Date.now()}`;
       await GenerationJobManager.createJob(streamId, 'user-1');
 
-      // Emit some content (emitChunk takes { event, data } format)
-      GenerationJobManager.emitChunk(streamId, {
+      // Emit some content (emitChunk takes { event, data } format, now async)
+      await GenerationJobManager.emitChunk(streamId, {
         event: 'on_run_step',
         data: {
           id: 'step-1',
@@ -286,7 +290,7 @@ describe('GenerationJobManager Integration Tests', () => {
           stepDetails: { type: 'message_creation' },
         },
       });
-      GenerationJobManager.emitChunk(streamId, {
+      await GenerationJobManager.emitChunk(streamId, {
         event: 'on_message_delta',
         data: {
           id: 'step-1',
@@ -314,10 +318,7 @@ describe('GenerationJobManager Integration Tests', () => {
       const runTestWithMode = async (isRedis: boolean) => {
         jest.resetModules();
 
-        const { GenerationJobManager } = await import('../GenerationJobManager');
-
         if (isRedis && ioredisClient) {
-          const { createStreamServices } = await import('../createStreamServices');
           GenerationJobManager.configure({
             ...createStreamServices({
               useRedis: true,
@@ -326,10 +327,6 @@ describe('GenerationJobManager Integration Tests', () => {
             cleanupOnComplete: false, // Keep job for verification
           });
         } else {
-          const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
-          const { InMemoryEventTransport } = await import(
-            '../implementations/InMemoryEventTransport'
-          );
           GenerationJobManager.configure({
             jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
             eventTransport: new InMemoryEventTransport(),
@@ -338,7 +335,7 @@ describe('GenerationJobManager Integration Tests', () => {
           });
         }
 
-        await GenerationJobManager.initialize();
+        GenerationJobManager.initialize();
 
         const streamId = `consistency-${isRedis ? 'redis' : 'inmem'}-${Date.now()}`;
 
@@ -395,8 +392,6 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { RedisJobStore } = await import('../implementations/RedisJobStore');
-
       // === REPLICA A: Creates the job ===
       // Simulate Replica A creating the job directly in Redis
       // (In real scenario, this happens via GenerationJobManager.createJob on Replica A)
@@ -412,8 +407,6 @@ describe('GenerationJobManager Integration Tests', () => {
       // === REPLICA B: Receives the stream request ===
       // Fresh GenerationJobManager that does NOT have this job in its local runtimeState
       jest.resetModules();
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { createStreamServices } = await import('../createStreamServices');
 
       const services = createStreamServices({
         useRedis: true,
@@ -421,7 +414,7 @@ describe('GenerationJobManager Integration Tests', () => {
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       // This is what the stream endpoint does:
       // const job = await GenerationJobManager.getJob(streamId);
@@ -464,10 +457,6 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      // Simulate two instances - one creates job, other tries to get it
-      const { createStreamServices } = await import('../createStreamServices');
-      const { RedisJobStore } = await import('../implementations/RedisJobStore');
-
       // Instance 1: Create the job directly in Redis (simulating another replica)
       const jobStore = new RedisJobStore(ioredisClient);
       await jobStore.initialize();
@@ -480,7 +469,6 @@ describe('GenerationJobManager Integration Tests', () => {
 
       // Instance 2: Fresh GenerationJobManager that doesn't have this job in memory
       jest.resetModules();
-      const { GenerationJobManager } = await import('../GenerationJobManager');
 
       const services = createStreamServices({
         useRedis: true,
@@ -488,7 +476,7 @@ describe('GenerationJobManager Integration Tests', () => {
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       // This should work even though the job was created by "another instance"
       // The manager should lazily create runtime state from Redis data
@@ -517,16 +505,13 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { createStreamServices } = await import('../createStreamServices');
-
       const services = createStreamServices({
         useRedis: true,
         redisClient: ioredisClient,
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `sync-sent-${Date.now()}`;
       await GenerationJobManager.createJob(streamId, 'user-1');
@@ -559,9 +544,6 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { createStreamServices } = await import('../createStreamServices');
-
       const services = createStreamServices({
         useRedis: true,
         redisClient: ioredisClient,
@@ -571,7 +553,7 @@ describe('GenerationJobManager Integration Tests', () => {
         ...services,
         cleanupOnComplete: false, // Keep job for verification
       });
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `final-event-${Date.now()}`;
       await GenerationJobManager.createJob(streamId, 'user-1');
@@ -582,7 +564,7 @@ describe('GenerationJobManager Integration Tests', () => {
         conversation: { conversationId: streamId },
         responseMessage: { text: 'Hello world' },
       };
-      GenerationJobManager.emitDone(streamId, finalEventData as never);
+      await GenerationJobManager.emitDone(streamId, finalEventData as never);
 
       await new Promise((resolve) => setTimeout(resolve, 200));
 
@@ -604,16 +586,13 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-      const { createStreamServices } = await import('../createStreamServices');
-
       const services = createStreamServices({
         useRedis: true,
         redisClient: ioredisClient,
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `abort-signal-${Date.now()}`;
       const job = await GenerationJobManager.createJob(streamId, 'user-1');
@@ -649,9 +628,6 @@ describe('GenerationJobManager Integration Tests', () => {
       // This test validates that jobs created on Replica A and lazily-initialized
       // on Replica B can still receive and handle abort signals.
 
-      const { createStreamServices } = await import('../createStreamServices');
-      const { RedisJobStore } = await import('../implementations/RedisJobStore');
-
       // === Replica A: Create job directly in Redis ===
       const replicaAJobStore = new RedisJobStore(ioredisClient);
       await replicaAJobStore.initialize();
@@ -661,7 +637,6 @@ describe('GenerationJobManager Integration Tests', () => {
 
       // === Replica B: Fresh manager that lazily initializes the job ===
       jest.resetModules();
-      const { GenerationJobManager } = await import('../GenerationJobManager');
 
       const services = createStreamServices({
         useRedis: true,
@@ -669,7 +644,7 @@ describe('GenerationJobManager Integration Tests', () => {
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       // Get job triggers lazy initialization of runtime state
       const job = await GenerationJobManager.getJob(streamId);
@@ -710,19 +685,14 @@ describe('GenerationJobManager Integration Tests', () => {
       // 2. Replica B receives abort request and emits abort signal
       // 3. Replica A receives signal and aborts its AbortController
 
-      const { createStreamServices } = await import('../createStreamServices');
-      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
-
       // Create the job on "Replica A"
-      const { GenerationJobManager } = await import('../GenerationJobManager');
-
       const services = createStreamServices({
         useRedis: true,
         redisClient: ioredisClient,
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       const streamId = `cross-abort-${Date.now()}`;
       const job = await GenerationJobManager.createJob(streamId, 'user-1');
@@ -764,9 +734,6 @@ describe('GenerationJobManager Integration Tests', () => {
         return;
       }
 
-      const { createStreamServices } = await import('../createStreamServices');
-      const { RedisJobStore } = await import('../implementations/RedisJobStore');
-
       // Create job directly in Redis with syncSent: true
       const jobStore = new RedisJobStore(ioredisClient);
       await jobStore.initialize();
@@ -777,7 +744,6 @@ describe('GenerationJobManager Integration Tests', () => {
 
       // Fresh manager that doesn't have this job locally
       jest.resetModules();
-      const { GenerationJobManager } = await import('../GenerationJobManager');
 
       const services = createStreamServices({
         useRedis: true,
@@ -785,7 +751,7 @@ describe('GenerationJobManager Integration Tests', () => {
       });
 
       GenerationJobManager.configure(services);
-      await GenerationJobManager.initialize();
+      GenerationJobManager.initialize();
 
       // wasSyncSent should check Redis even without local runtime
       const wasSent = await GenerationJobManager.wasSyncSent(streamId);
@@ -796,36 +762,1158 @@ describe('GenerationJobManager Integration Tests', () => {
     });
   });
 
-  describe('createStreamServices Auto-Detection', () => {
-    test('should auto-detect Redis when USE_REDIS is true', async () => {
+  describe('Sequential Event Ordering (Redis)', () => {
+    /**
+     * These tests verify that events are delivered in strict sequential order
+     * when using Redis mode. This is critical because:
+     * 1. LLM streaming tokens must arrive in order for coherent output
+     * 2. Tool call argument deltas must be concatenated in order
+     * 3. Run step events must precede their deltas
+     *
+     * The fix: emitChunk now awaits Redis publish to ensure ordered delivery.
+     */
+    test('should maintain strict order for rapid sequential emits', async () => {
       if (!ioredisClient) {
         console.warn('Redis not available, skipping test');
         return;
       }
 
-      // Force USE_REDIS to true
-      process.env.USE_REDIS = 'true';
       jest.resetModules();
 
-      const { createStreamServices } = await import('../createStreamServices');
-      const services = createStreamServices();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
 
-      // Should detect Redis
-      expect(services.isRedis).toBe(true);
+      GenerationJobManager.configure(services);
+      GenerationJobManager.initialize();
+
+      const streamId = `order-rapid-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      const receivedIndices: number[] = [];
+
+      const subscription = await GenerationJobManager.subscribe(streamId, (event) => {
+        const data = event as { event: string; data: { index: number } };
+        if (data.event === 'test') {
+          receivedIndices.push(data.data.index);
+        }
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Emit 30 events rapidly - with await, they must arrive in order
+      for (let i = 0; i < 30; i++) {
+        await GenerationJobManager.emitChunk(streamId, {
+          event: 'test',
+          data: { index: i },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      // Verify all events arrived in correct order
+      expect(receivedIndices.length).toBe(30);
+      for (let i = 0; i < 30; i++) {
+        expect(receivedIndices[i]).toBe(i);
+      }
+
+      subscription?.unsubscribe();
+      await GenerationJobManager.destroy();
     });
 
-    test('should fall back to in-memory when USE_REDIS is false', async () => {
-      process.env.USE_REDIS = 'false';
+    test('should maintain order for tool call argument deltas', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
       jest.resetModules();
 
-      const { createStreamServices } = await import('../createStreamServices');
-      const services = createStreamServices();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      GenerationJobManager.configure(services);
+      GenerationJobManager.initialize();
+
+      const streamId = `tool-args-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      const receivedArgs: string[] = [];
+
+      const subscription = await GenerationJobManager.subscribe(streamId, (event) => {
+        const data = event as {
+          event: string;
+          data: { delta: { tool_calls: { args: string }[] } };
+        };
+        if (data.event === 'on_run_step_delta') {
+          receivedArgs.push(data.data.delta.tool_calls[0].args);
+        }
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Simulate streaming JSON args: {"code": "print('hello')"}
+      const argChunks = ['{"', 'code', '": "', 'print', "('", 'hello', "')", '"}'];
+
+      for (const chunk of argChunks) {
+        await GenerationJobManager.emitChunk(streamId, {
+          event: 'on_run_step_delta',
+          data: {
+            id: 'step-1',
+            delta: {
+              type: 'tool_calls',
+              tool_calls: [{ index: 0, args: chunk }],
+            },
+          },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      // This was the original bug - args would arrive scrambled without await
+      expect(receivedArgs).toEqual(argChunks);
+      expect(receivedArgs.join('')).toBe(`{"code": "print('hello')"}`);
+
+      subscription?.unsubscribe();
+      await GenerationJobManager.destroy();
+    });
+
+    test('should maintain order: on_run_step before on_run_step_delta', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      jest.resetModules();
+
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      GenerationJobManager.configure(services);
+      GenerationJobManager.initialize();
+
+      const streamId = `step-order-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      const receivedEvents: string[] = [];
+
+      const subscription = await GenerationJobManager.subscribe(streamId, (event) => {
+        const data = event as { event: string };
+        receivedEvents.push(data.event);
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Emit in correct order: step first, then deltas
+      await GenerationJobManager.emitChunk(streamId, {
+        event: 'on_run_step',
+        data: { id: 'step-1', type: 'tool_calls', index: 0 },
+      });
+
+      await GenerationJobManager.emitChunk(streamId, {
+        event: 'on_run_step_delta',
+        data: { id: 'step-1', delta: { type: 'tool_calls', tool_calls: [{ args: '{' }] } },
+      });
+
+      await GenerationJobManager.emitChunk(streamId, {
+        event: 'on_run_step_delta',
+        data: { id: 'step-1', delta: { type: 'tool_calls', tool_calls: [{ args: '}' }] } },
+      });
+
+      await GenerationJobManager.emitChunk(streamId, {
+        event: 'on_run_step_completed',
+        data: { id: 'step-1', result: { content: '{}' } },
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      // Verify ordering: step -> deltas -> completed
+      expect(receivedEvents).toEqual([
+        'on_run_step',
+        'on_run_step_delta',
+        'on_run_step_delta',
+        'on_run_step_completed',
+      ]);
+
+      subscription?.unsubscribe();
+      await GenerationJobManager.destroy();
+    });
+
+    test('should not block other streams when awaiting emitChunk', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      jest.resetModules();
+
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      GenerationJobManager.configure(services);
+      GenerationJobManager.initialize();
+
+      const streamId1 = `concurrent-1-${Date.now()}`;
+      const streamId2 = `concurrent-2-${Date.now()}`;
+
+      await GenerationJobManager.createJob(streamId1, 'user-1');
+      await GenerationJobManager.createJob(streamId2, 'user-2');
+
+      const stream1Events: number[] = [];
+      const stream2Events: number[] = [];
+
+      const sub1 = await GenerationJobManager.subscribe(streamId1, (event) => {
+        const data = event as { event: string; data: { index: number } };
+        if (data.event === 'test') {
+          stream1Events.push(data.data.index);
+        }
+      });
+
+      const sub2 = await GenerationJobManager.subscribe(streamId2, (event) => {
+        const data = event as { event: string; data: { index: number } };
+        if (data.event === 'test') {
+          stream2Events.push(data.data.index);
+        }
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Emit to both streams concurrently (simulating two LLM responses)
+      const emitPromises: Promise<void>[] = [];
+      for (let i = 0; i < 10; i++) {
+        emitPromises.push(
+          GenerationJobManager.emitChunk(streamId1, { event: 'test', data: { index: i } }),
+        );
+        emitPromises.push(
+          GenerationJobManager.emitChunk(streamId2, { event: 'test', data: { index: i * 100 } }),
+        );
+      }
+      await Promise.all(emitPromises);
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      // Each stream should have all events, in order within their stream
+      expect(stream1Events.length).toBe(10);
+      expect(stream2Events.length).toBe(10);
+
+      // Verify each stream's internal order
+      for (let i = 0; i < 10; i++) {
+        expect(stream1Events[i]).toBe(i);
+        expect(stream2Events[i]).toBe(i * 100);
+      }
+
+      sub1?.unsubscribe();
+      sub2?.unsubscribe();
+      await GenerationJobManager.destroy();
+    });
+  });
+
+  describe('Race Condition: Events Before Subscriber Ready', () => {
+    /**
+     * These tests verify the fix for the race condition where early events
+     * (like the 'created' event at seq 0) are lost because the Redis SUBSCRIBE
+     * command hasn't completed when events are published.
+     *
+     * Symptom: "[RedisEventTransport] Stream <id>: timeout waiting for seq 0"
+     *          followed by truncated responses in the UI.
+     *
+     * Root cause: RedisEventTransport.subscribe() fired Redis SUBSCRIBE as
+     * fire-and-forget. GenerationJobManager set hasSubscriber=true immediately,
+     * disabling the earlyEventBuffer before Redis was actually listening.
+     *
+     * Fix: subscribe() now returns a `ready` promise that resolves when the
+     * Redis subscription is confirmed. earlyEventBuffer stays active until then.
+     */
+
+    test('should buffer and replay events emitted before subscribe (in-memory)', async () => {
+      const manager = new GenerationJobManagerClass();
+      manager.configure({
+        jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
+        eventTransport: new InMemoryEventTransport(),
+        isRedis: false,
+      });
+
+      manager.initialize();
+
+      const streamId = `early-buf-inmem-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      await manager.emitChunk(streamId, {
+        created: true,
+        message: { text: 'hello' },
+        streamId,
+      } as unknown as ServerSentEvent);
+      await manager.emitChunk(streamId, {
+        event: 'on_message_delta',
+        data: { delta: { content: { type: 'text', text: 'First chunk' } } },
+      });
+
+      const receivedEvents: unknown[] = [];
+      const subscription = await manager.subscribe(streamId, (event: unknown) =>
+        receivedEvents.push(event),
+      );
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      expect(receivedEvents.length).toBe(2);
+      expect((receivedEvents[0] as Record<string, unknown>).created).toBe(true);
+
+      subscription?.unsubscribe();
+      await manager.destroy();
+    });
+
+    test('should buffer and replay events emitted before subscribe (Redis)', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const manager = new GenerationJobManagerClass();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      manager.configure(services);
+      manager.initialize();
+
+      const streamId = `early-buf-redis-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      await manager.emitChunk(streamId, {
+        created: true,
+        message: { text: 'hello' },
+        streamId,
+      } as unknown as ServerSentEvent);
+      await manager.emitChunk(streamId, {
+        event: 'on_message_delta',
+        data: { delta: { content: { type: 'text', text: 'First' } } },
+      });
+      await manager.emitChunk(streamId, {
+        event: 'on_message_delta',
+        data: { delta: { content: { type: 'text', text: ' chunk' } } },
+      });
+
+      const receivedEvents: unknown[] = [];
+      const subscription = await manager.subscribe(streamId, (event: unknown) =>
+        receivedEvents.push(event),
+      );
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      expect(receivedEvents.length).toBe(3);
+      expect((receivedEvents[0] as Record<string, unknown>).created).toBe(true);
+      expect(
+        ((receivedEvents[1] as Record<string, unknown>).data as Record<string, unknown>).delta,
+      ).toBeDefined();
+
+      subscription?.unsubscribe();
+      await manager.destroy();
+    });
+
+    test('should not lose events when emitting before and after subscribe (Redis)', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const manager = new GenerationJobManagerClass();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      manager.configure(services);
+      manager.initialize();
+
+      const streamId = `no-loss-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      await manager.emitChunk(streamId, {
+        created: true,
+        message: { text: 'hello' },
+        streamId,
+      } as unknown as ServerSentEvent);
+      await manager.emitChunk(streamId, {
+        event: 'on_run_step',
+        data: { id: 'step-1', type: 'message_creation', index: 0 },
+      });
+
+      const receivedEvents: unknown[] = [];
+      const subscription = await manager.subscribe(streamId, (event: unknown) =>
+        receivedEvents.push(event),
+      );
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      for (let i = 0; i < 10; i++) {
+        await manager.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `word${i} ` } }, index: i },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      expect(receivedEvents.length).toBe(12);
+      expect((receivedEvents[0] as Record<string, unknown>).created).toBe(true);
+      expect((receivedEvents[1] as Record<string, unknown>).event).toBe('on_run_step');
+      for (let i = 0; i < 10; i++) {
+        expect((receivedEvents[i + 2] as Record<string, unknown>).event).toBe('on_message_delta');
+      }
+
+      subscription?.unsubscribe();
+      await manager.destroy();
+    });
+
+    test('RedisEventTransport.subscribe() should return a ready promise', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const subscriber = (ioredisClient as unknown as { duplicate: () => unknown }).duplicate();
+      const transport = new RedisEventTransport(ioredisClient as never, subscriber as never);
+
+      const streamId = `ready-promise-${Date.now()}`;
+      const result = transport.subscribe(streamId, {
+        onChunk: () => {},
+      });
+
+      expect(result.ready).toBeDefined();
+      expect(result.ready).toBeInstanceOf(Promise);
+
+      await result.ready;
+
+      result.unsubscribe();
+      transport.destroy();
+      (subscriber as { disconnect: () => void }).disconnect();
+    });
+
+    test('InMemoryEventTransport.subscribe() should not have a ready promise', () => {
+      const transport = new InMemoryEventTransport();
+      const streamId = `no-ready-${Date.now()}`;
+      const result = transport.subscribe(streamId, {
+        onChunk: () => {},
+      });
+
+      expect(result.ready).toBeUndefined();
+
+      result.unsubscribe();
+      transport.destroy();
+    });
+  });
+
+  describe('Error Preservation for Late Subscribers', () => {
+    /**
+     * These tests verify the fix for the race condition where errors
+     * (like INPUT_LENGTH) occur before the SSE client connects.
+     *
+     * Problem: Error → emitError → completeJob → job deleted → client connects → 404
+     * Fix: Store error, don't delete job immediately, send error to late subscriber
+     */
+
+    test('should store error in emitError for late-connecting subscribers', async () => {
+      GenerationJobManager.configure({
+        jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
+        eventTransport: new InMemoryEventTransport(),
+        isRedis: false,
+        cleanupOnComplete: false,
+      });
+
+      GenerationJobManager.initialize();
+
+      const streamId = `error-store-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      const errorMessage = '{ "type": "INPUT_LENGTH", "info": "234856 / 172627" }';
+
+      // Emit error (no subscribers yet - simulates race condition)
+      await GenerationJobManager.emitError(streamId, errorMessage);
+
+      // Wait for async job store update
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      // Verify error is stored in job store
+      const job = await GenerationJobManager.getJob(streamId);
+      expect(job?.error).toBe(errorMessage);
+
+      await GenerationJobManager.destroy();
+    });
+
+    test('should NOT delete job immediately when completeJob is called with error', async () => {
+      GenerationJobManager.configure({
+        jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
+        eventTransport: new InMemoryEventTransport(),
+        isRedis: false,
+        cleanupOnComplete: true, // Default behavior
+      });
+
+      GenerationJobManager.initialize();
+
+      const streamId = `error-no-delete-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      const errorMessage = 'Test error message';
+
+      // Complete with error
+      await GenerationJobManager.completeJob(streamId, errorMessage);
+
+      // Job should still exist (not deleted)
+      const hasJob = await GenerationJobManager.hasJob(streamId);
+      expect(hasJob).toBe(true);
+
+      // Job should have error status
+      const job = await GenerationJobManager.getJob(streamId);
+      expect(job?.status).toBe('error');
+      expect(job?.error).toBe(errorMessage);
+
+      await GenerationJobManager.destroy();
+    });
+
+    test('should send stored error to late-connecting subscriber', async () => {
+      GenerationJobManager.configure({
+        jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
+        eventTransport: new InMemoryEventTransport(),
+        isRedis: false,
+        cleanupOnComplete: true,
+      });
+
+      GenerationJobManager.initialize();
+
+      const streamId = `error-late-sub-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      const errorMessage = '{ "type": "INPUT_LENGTH", "info": "234856 / 172627" }';
+
+      // Simulate race condition: error occurs before client connects
+      await GenerationJobManager.emitError(streamId, errorMessage);
+      await GenerationJobManager.completeJob(streamId, errorMessage);
+
+      // Wait for async operations
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      // Now client connects (late subscriber)
+      let receivedError: string | undefined;
+      const subscription = await GenerationJobManager.subscribe(
+        streamId,
+        () => {}, // onChunk
+        () => {}, // onDone
+        (error) => {
+          receivedError = error;
+        }, // onError
+      );
+
+      expect(subscription).not.toBeNull();
+
+      // Wait for setImmediate in subscribe to fire
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      // Late subscriber should receive the stored error
+      expect(receivedError).toBe(errorMessage);
+
+      subscription?.unsubscribe();
+      await GenerationJobManager.destroy();
+    });
+
+    test('should prioritize error status over finalEvent in subscribe', async () => {
+      GenerationJobManager.configure({
+        jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
+        eventTransport: new InMemoryEventTransport(),
+        isRedis: false,
+        cleanupOnComplete: false,
+      });
+
+      GenerationJobManager.initialize();
+
+      const streamId = `error-priority-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      const errorMessage = 'Error should take priority';
+
+      // Emit error and complete with error
+      await GenerationJobManager.emitError(streamId, errorMessage);
+      await GenerationJobManager.completeJob(streamId, errorMessage);
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      // Subscribe and verify error is received (not a done event)
+      let receivedError: string | undefined;
+      let receivedDone = false;
+
+      const subscription = await GenerationJobManager.subscribe(
+        streamId,
+        () => {},
+        () => {
+          receivedDone = true;
+        },
+        (error) => {
+          receivedError = error;
+        },
+      );
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      // Error should be received, not done
+      expect(receivedError).toBe(errorMessage);
+      expect(receivedDone).toBe(false);
+
+      subscription?.unsubscribe();
+      await GenerationJobManager.destroy();
+    });
+
+    test('should handle error preservation in Redis mode (cross-replica)', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      // === Replica A: Creates job and emits error ===
+      const replicaAJobStore = new RedisJobStore(ioredisClient);
+      await replicaAJobStore.initialize();
+
+      const streamId = `redis-error-${Date.now()}`;
+      const errorMessage = '{ "type": "INPUT_LENGTH", "info": "234856 / 172627" }';
+
+      await replicaAJobStore.createJob(streamId, 'user-1');
+      await replicaAJobStore.updateJob(streamId, {
+        status: 'error',
+        error: errorMessage,
+        completedAt: Date.now(),
+      });
+
+      // === Replica B: Fresh manager receives client connection ===
+      jest.resetModules();
+
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      GenerationJobManager.configure({
+        ...services,
+        cleanupOnComplete: false,
+      });
+      GenerationJobManager.initialize();
+
+      // Client connects to Replica B (job created on Replica A)
+      let receivedError: string | undefined;
+      const subscription = await GenerationJobManager.subscribe(
+        streamId,
+        () => {},
+        () => {},
+        (error) => {
+          receivedError = error;
+        },
+      );
+
+      expect(subscription).not.toBeNull();
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Error should be loaded from Redis and sent to subscriber
+      expect(receivedError).toBe(errorMessage);
+
+      subscription?.unsubscribe();
+      await GenerationJobManager.destroy();
+      await replicaAJobStore.destroy();
+    });
+
+    test('error jobs should be cleaned up by periodic cleanup after TTL', async () => {
+      // Use a very short TTL for testing
+      const jobStore = new InMemoryJobStore({ ttlAfterComplete: 100 });
+
+      GenerationJobManager.configure({
+        jobStore,
+        eventTransport: new InMemoryEventTransport(),
+        isRedis: false,
+        cleanupOnComplete: true,
+      });
+
+      GenerationJobManager.initialize();
+
+      const streamId = `error-cleanup-${Date.now()}`;
+      await GenerationJobManager.createJob(streamId, 'user-1');
+
+      // Complete with error
+      await GenerationJobManager.completeJob(streamId, 'Test error');
+
+      // Job should exist immediately after error
+      let hasJob = await GenerationJobManager.hasJob(streamId);
+      expect(hasJob).toBe(true);
+
+      // Wait for TTL to expire
+      await new Promise((resolve) => setTimeout(resolve, 150));
+
+      // Trigger cleanup
+      await jobStore.cleanup();
+
+      // Job should be cleaned up after TTL
+      hasJob = await GenerationJobManager.hasJob(streamId);
+      expect(hasJob).toBe(false);
+
+      await GenerationJobManager.destroy();
+    });
+  });
+
+  describe('Cross-Replica Live Streaming (Redis)', () => {
+    test('should publish events to Redis even when no local subscriber exists', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const replicaA = new GenerationJobManagerClass();
+      const servicesA = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      replicaA.configure(servicesA);
+      replicaA.initialize();
+
+      const replicaB = new GenerationJobManagerClass();
+      const servicesB = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      replicaB.configure(servicesB);
+      replicaB.initialize();
+
+      const streamId = `cross-live-${Date.now()}`;
+      await replicaA.createJob(streamId, 'user-1');
+
+      const replicaBJobStore = new RedisJobStore(ioredisClient);
+      await replicaBJobStore.initialize();
+      await replicaBJobStore.createJob(streamId, 'user-1');
+
+      const receivedOnB: unknown[] = [];
+      const subB = await replicaB.subscribe(streamId, (event: unknown) => receivedOnB.push(event));
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      for (let i = 0; i < 5; i++) {
+        await replicaA.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `token${i} ` } }, index: i },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      expect(receivedOnB.length).toBe(5);
+      for (let i = 0; i < 5; i++) {
+        expect((receivedOnB[i] as Record<string, unknown>).event).toBe('on_message_delta');
+      }
+
+      subB?.unsubscribe();
+      replicaBJobStore.destroy();
+      await replicaA.destroy();
+      await replicaB.destroy();
+    });
+
+    test('should not cause data loss on cross-replica subscribers when local subscriber joins', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const replicaA = new GenerationJobManagerClass();
+      const servicesA = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      replicaA.configure(servicesA);
+      replicaA.initialize();
+
+      const replicaB = new GenerationJobManagerClass();
+      const servicesB = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      replicaB.configure(servicesB);
+      replicaB.initialize();
+
+      const streamId = `cross-seq-safe-${Date.now()}`;
+
+      await replicaA.createJob(streamId, 'user-1');
+      const replicaBJobStore = new RedisJobStore(ioredisClient);
+      await replicaBJobStore.initialize();
+      await replicaBJobStore.createJob(streamId, 'user-1');
+
+      const receivedOnB: unknown[] = [];
+      const subB = await replicaB.subscribe(streamId, (event: unknown) => receivedOnB.push(event));
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      for (let i = 0; i < 3; i++) {
+        await replicaA.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `pre-local-${i}` } }, index: i },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+      expect(receivedOnB.length).toBe(3);
+
+      const receivedOnA: unknown[] = [];
+      const subA = await replicaA.subscribe(streamId, (event: unknown) => receivedOnA.push(event));
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      expect(receivedOnA.length).toBe(3);
+
+      for (let i = 0; i < 3; i++) {
+        await replicaA.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `post-local-${i}` } }, index: i + 3 },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      expect(receivedOnB.length).toBe(6);
+      expect(receivedOnA.length).toBe(6);
+
+      for (let i = 0; i < 3; i++) {
+        const data = (receivedOnB[i] as Record<string, unknown>).data as Record<string, unknown>;
+        const delta = data.delta as Record<string, unknown>;
+        const content = delta.content as Record<string, unknown>;
+        expect(content.text).toBe(`pre-local-${i}`);
+      }
+      for (let i = 0; i < 3; i++) {
+        const data = (receivedOnB[i + 3] as Record<string, unknown>).data as Record<
+          string,
+          unknown
+        >;
+        const delta = data.delta as Record<string, unknown>;
+        const content = delta.content as Record<string, unknown>;
+        expect(content.text).toBe(`post-local-${i}`);
+      }
+
+      subA?.unsubscribe();
+      subB?.unsubscribe();
+      replicaBJobStore.destroy();
+      await replicaA.destroy();
+      await replicaB.destroy();
+    });
+
+    test('should deliver buffered events locally AND publish live events cross-replica', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const replicaA = new GenerationJobManagerClass();
+      const servicesA = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      replicaA.configure(servicesA);
+      replicaA.initialize();
+
+      const streamId = `cross-buf-live-${Date.now()}`;
+      await replicaA.createJob(streamId, 'user-1');
+
+      await replicaA.emitChunk(streamId, {
+        created: true,
+        message: { text: 'hello' },
+        streamId,
+      } as unknown as ServerSentEvent);
+
+      const receivedOnA: unknown[] = [];
+      const subA = await replicaA.subscribe(streamId, (event: unknown) => receivedOnA.push(event));
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      expect(receivedOnA.length).toBe(1);
+      expect((receivedOnA[0] as Record<string, unknown>).created).toBe(true);
+
+      const replicaB = new GenerationJobManagerClass();
+      const servicesB = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      replicaB.configure(servicesB);
+      replicaB.initialize();
+
+      const replicaBJobStore = new RedisJobStore(ioredisClient);
+      await replicaBJobStore.initialize();
+      await replicaBJobStore.createJob(streamId, 'user-1');
+
+      const receivedOnB: unknown[] = [];
+      const subB = await replicaB.subscribe(streamId, (event: unknown) => receivedOnB.push(event));
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      for (let i = 0; i < 3; i++) {
+        await replicaA.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `word${i} ` } }, index: i },
+        });
+      }
+
+      /** B joined after A published seq 0, so B's reorder buffer force-flushes after REORDER_TIMEOUT_MS (500ms) */
+      await new Promise((resolve) => setTimeout(resolve, 700));
+
+      expect(receivedOnA.length).toBe(4);
+      expect(receivedOnB.length).toBe(3);
+
+      subA?.unsubscribe();
+      subB?.unsubscribe();
+      replicaBJobStore.destroy();
+      await replicaA.destroy();
+      await replicaB.destroy();
+    });
+  });
+
+  describe('Concurrent Subscriber Readiness (Redis)', () => {
+    test('should return ready promise to all concurrent subscribers for same stream', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const subscriber = (
+        ioredisClient as unknown as { duplicate: () => typeof ioredisClient }
+      ).duplicate()!;
+      const transport = new RedisEventTransport(ioredisClient as never, subscriber as never);
+
+      const streamId = `concurrent-sub-${Date.now()}`;
+
+      const sub1 = transport.subscribe(streamId, {
+        onChunk: () => {},
+        onDone: () => {},
+      });
+      const sub2 = transport.subscribe(streamId, {
+        onChunk: () => {},
+        onDone: () => {},
+      });
+
+      expect(sub1.ready).toBeDefined();
+      expect(sub2.ready).toBeDefined();
+
+      await Promise.all([sub1.ready, sub2.ready]);
+
+      sub1.unsubscribe();
+      sub2.unsubscribe();
+      transport.destroy();
+      subscriber.disconnect();
+    });
+  });
+
+  describe('Sequence Reset Safety (Redis)', () => {
+    test('should not receive stale pre-subscribe events via Redis after sequence reset', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const manager = new GenerationJobManagerClass();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      manager.configure(services);
+      manager.initialize();
+
+      const streamId = `seq-stale-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      await manager.emitChunk(streamId, {
+        event: 'on_message_delta',
+        data: { delta: { content: { type: 'text', text: 'pre-sub-0' } }, index: 0 },
+      });
+      await manager.emitChunk(streamId, {
+        event: 'on_message_delta',
+        data: { delta: { content: { type: 'text', text: 'pre-sub-1' } }, index: 1 },
+      });
+
+      const receivedEvents: unknown[] = [];
+      const sub = await manager.subscribe(streamId, (event: unknown) => receivedEvents.push(event));
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      expect(receivedEvents.length).toBe(2);
+      expect(
+        ((receivedEvents[0] as Record<string, unknown>).data as Record<string, unknown>).delta,
+      ).toBeDefined();
+
+      for (let i = 0; i < 5; i++) {
+        await manager.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `post-sub-${i}` } }, index: i + 2 },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      expect(receivedEvents.length).toBe(7);
+
+      const texts = receivedEvents.map(
+        (e) =>
+          (
+            ((e as Record<string, unknown>).data as Record<string, unknown>).delta as Record<
+              string,
+              unknown
+            >
+          ).content as Record<string, unknown>,
+      );
+      expect((texts[0] as Record<string, unknown>).text).toBe('pre-sub-0');
+      expect((texts[1] as Record<string, unknown>).text).toBe('pre-sub-1');
+      for (let i = 0; i < 5; i++) {
+        expect((texts[i + 2] as Record<string, unknown>).text).toBe(`post-sub-${i}`);
+      }
+
+      sub?.unsubscribe();
+      await manager.destroy();
+    });
+
+    test('should not reset sequence when second subscriber joins mid-stream', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const manager = new GenerationJobManagerClass();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+      manager.configure({ ...services, cleanupOnComplete: false });
+      manager.initialize();
+
+      const streamId = `seq-2nd-sub-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      const eventsA: unknown[] = [];
+      const subA = await manager.subscribe(streamId, (event: unknown) => eventsA.push(event));
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      for (let i = 0; i < 3; i++) {
+        await manager.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `chunk-${i}` } }, index: i },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      expect(eventsA.length).toBe(3);
+
+      const eventsB: unknown[] = [];
+      const subB = await manager.subscribe(streamId, (event: unknown) => eventsB.push(event));
+
+      for (let i = 3; i < 6; i++) {
+        await manager.emitChunk(streamId, {
+          event: 'on_message_delta',
+          data: { delta: { content: { type: 'text', text: `chunk-${i}` } }, index: i },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      expect(eventsA.length).toBe(6);
+      expect(eventsB.length).toBe(3);
+
+      for (let i = 0; i < 6; i++) {
+        const text = (
+          (
+            ((eventsA[i] as Record<string, unknown>).data as Record<string, unknown>)
+              .delta as Record<string, unknown>
+          ).content as Record<string, unknown>
+        ).text;
+        expect(text).toBe(`chunk-${i}`);
+      }
+
+      subA?.unsubscribe();
+      subB?.unsubscribe();
+      await manager.destroy();
+    });
+  });
+
+  describe('Subscribe Error Recovery (Redis)', () => {
+    test('should allow resubscription after Redis subscribe failure', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const subscriber = (
+        ioredisClient as unknown as { duplicate: () => typeof ioredisClient }
+      ).duplicate()!;
+
+      const realSubscribe = subscriber.subscribe.bind(subscriber);
+      let callCount = 0;
+      subscriber.subscribe = ((...args: Parameters<typeof subscriber.subscribe>) => {
+        callCount++;
+        if (callCount === 1) {
+          return Promise.reject(new Error('Simulated Redis SUBSCRIBE failure'));
+        }
+        return realSubscribe(...args);
+      }) as typeof subscriber.subscribe;
+
+      const transport = new RedisEventTransport(ioredisClient as never, subscriber as never);
+
+      const streamId = `err-retry-${Date.now()}`;
+
+      const sub1 = transport.subscribe(streamId, {
+        onChunk: () => {},
+        onDone: () => {},
+      });
+
+      await sub1.ready;
+
+      const receivedEvents: unknown[] = [];
+      sub1.unsubscribe();
+
+      const sub2 = transport.subscribe(streamId, {
+        onChunk: (event: unknown) => receivedEvents.push(event),
+        onDone: () => {},
+      });
+
+      expect(sub2.ready).toBeDefined();
+      await sub2.ready;
+
+      await transport.emitChunk(streamId, { event: 'test', data: { value: 'hello' } });
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      expect(receivedEvents.length).toBe(1);
+
+      sub2.unsubscribe();
+      transport.destroy();
+      subscriber.disconnect();
+    });
+  });
+
+  describe('createStreamServices Auto-Detection', () => {
+    test('should use Redis when useRedis is true and client is available', () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      expect(services.isRedis).toBe(true);
+      services.eventTransport.destroy();
+    });
+
+    test('should fall back to in-memory when useRedis is false', () => {
+      const services = createStreamServices({ useRedis: false });
 
       expect(services.isRedis).toBe(false);
     });
 
     test('should allow forcing in-memory via config override', async () => {
-      const { createStreamServices } = await import('../createStreamServices');
       const services = createStreamServices({ useRedis: false });
 
       expect(services.isRedis).toBe(false);
diff --git a/packages/api/src/stream/__tests__/RedisEventTransport.stream_integration.spec.ts b/packages/api/src/stream/__tests__/RedisEventTransport.stream_integration.spec.ts
index 31266b3e11..b5e53dfbff 100644
--- a/packages/api/src/stream/__tests__/RedisEventTransport.stream_integration.spec.ts
+++ b/packages/api/src/stream/__tests__/RedisEventTransport.stream_integration.spec.ts
@@ -19,8 +19,11 @@ describe('RedisEventTransport Integration Tests', () => {
     originalEnv = { ...process.env };
 
     process.env.USE_REDIS = process.env.USE_REDIS ?? 'true';
+    process.env.USE_REDIS_CLUSTER = process.env.USE_REDIS_CLUSTER ?? 'false';
     process.env.REDIS_URI = process.env.REDIS_URI ?? 'redis://127.0.0.1:6379';
     process.env.REDIS_KEY_PREFIX = testPrefix;
+    process.env.REDIS_PING_INTERVAL = '0';
+    process.env.REDIS_RETRY_MAX_ATTEMPTS = '5';
 
     jest.resetModules();
 
@@ -70,16 +73,16 @@ describe('RedisEventTransport Integration Tests', () => {
         },
       });
 
-      // Wait for subscription to be established
-      await new Promise((resolve) => setTimeout(resolve, 100));
+      // Wait for subscription to be established (increased for CI)
+      await new Promise((resolve) => setTimeout(resolve, 500));
 
-      // Emit events
-      transport.emitChunk(streamId, { type: 'text', text: 'Hello' });
-      transport.emitChunk(streamId, { type: 'text', text: ' World' });
-      transport.emitDone(streamId, { finished: true });
+      // Emit events (emitChunk/emitDone are async for ordered delivery)
+      await transport.emitChunk(streamId, { type: 'text', text: 'Hello' });
+      await transport.emitChunk(streamId, { type: 'text', text: ' World' });
+      await transport.emitDone(streamId, { finished: true });
 
-      // Wait for events to propagate
-      await new Promise((resolve) => setTimeout(resolve, 200));
+      // Wait for events to propagate (increased for CI)
+      await new Promise((resolve) => setTimeout(resolve, 500));
 
       expect(receivedChunks.length).toBe(2);
       expect(doneEvent).toEqual({ finished: true });
@@ -117,7 +120,7 @@ describe('RedisEventTransport Integration Tests', () => {
       await new Promise((resolve) => setTimeout(resolve, 100));
 
       // Emit from transport 1 (producer on different instance)
-      transport1.emitChunk(streamId, { data: 'from-instance-1' });
+      await transport1.emitChunk(streamId, { data: 'from-instance-1' });
 
       // Wait for cross-instance delivery
       await new Promise((resolve) => setTimeout(resolve, 200));
@@ -160,7 +163,7 @@ describe('RedisEventTransport Integration Tests', () => {
 
       await new Promise((resolve) => setTimeout(resolve, 100));
 
-      transport.emitChunk(streamId, { data: 'broadcast' });
+      await transport.emitChunk(streamId, { data: 'broadcast' });
 
       await new Promise((resolve) => setTimeout(resolve, 200));
 
@@ -175,6 +178,425 @@ describe('RedisEventTransport Integration Tests', () => {
     });
   });
 
+  describe('Sequential Event Ordering', () => {
+    test('should maintain strict order when emitChunk is awaited', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const subscriber = (ioredisClient as Redis).duplicate();
+      const transport = new RedisEventTransport(ioredisClient, subscriber);
+
+      const streamId = `order-test-${Date.now()}`;
+      const receivedEvents: number[] = [];
+
+      transport.subscribe(streamId, {
+        onChunk: (event) => receivedEvents.push((event as { index: number }).index),
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Emit 20 events rapidly with await - they should arrive in order
+      for (let i = 0; i < 20; i++) {
+        await transport.emitChunk(streamId, { index: i });
+      }
+
+      // Wait for all events to propagate
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      // Verify all events arrived in correct order
+      expect(receivedEvents.length).toBe(20);
+      for (let i = 0; i < 20; i++) {
+        expect(receivedEvents[i]).toBe(i);
+      }
+
+      transport.destroy();
+      subscriber.disconnect();
+    });
+
+    test('should maintain order for tool call delta chunks (simulates streaming args)', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const subscriber = (ioredisClient as Redis).duplicate();
+      const transport = new RedisEventTransport(ioredisClient, subscriber);
+
+      const streamId = `tool-delta-order-${Date.now()}`;
+      const receivedArgs: string[] = [];
+
+      transport.subscribe(streamId, {
+        onChunk: (event) => {
+          const data = event as {
+            event: string;
+            data: { delta: { tool_calls: { args: string }[] } };
+          };
+          if (data.event === 'on_run_step_delta') {
+            receivedArgs.push(data.data.delta.tool_calls[0].args);
+          }
+        },
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Simulate streaming tool call arguments like: {"code": "# First line\n..."
+      const argChunks = ['{"code"', ': "', '# First', ' line', '\\n', '..."', '}'];
+
+      for (const chunk of argChunks) {
+        await transport.emitChunk(streamId, {
+          event: 'on_run_step_delta',
+          data: {
+            id: 'step-1',
+            delta: {
+              type: 'tool_calls',
+              tool_calls: [{ index: 0, args: chunk }],
+            },
+          },
+        });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      // Verify chunks arrived in correct order - this was the bug we fixed
+      expect(receivedArgs).toEqual(argChunks);
+      expect(receivedArgs.join('')).toBe('{"code": "# First line\\n..."}');
+
+      transport.destroy();
+      subscriber.disconnect();
+    });
+
+    test('should maintain order across multiple concurrent streams (no cross-contamination)', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const subscriber = (ioredisClient as Redis).duplicate();
+      const transport = new RedisEventTransport(ioredisClient, subscriber);
+
+      const streamId1 = `concurrent-stream-1-${Date.now()}`;
+      const streamId2 = `concurrent-stream-2-${Date.now()}`;
+
+      const stream1Events: number[] = [];
+      const stream2Events: number[] = [];
+
+      transport.subscribe(streamId1, {
+        onChunk: (event) => stream1Events.push((event as { index: number }).index),
+      });
+      transport.subscribe(streamId2, {
+        onChunk: (event) => stream2Events.push((event as { index: number }).index),
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Interleave events from both streams
+      for (let i = 0; i < 10; i++) {
+        await transport.emitChunk(streamId1, { index: i });
+        await transport.emitChunk(streamId2, { index: i * 10 });
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, 300));
+
+      // Each stream should have its own ordered events
+      expect(stream1Events).toEqual([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
+      expect(stream2Events).toEqual([0, 10, 20, 30, 40, 50, 60, 70, 80, 90]);
+
+      transport.destroy();
+      subscriber.disconnect();
+    });
+  });
+
+  describe('Reorder Buffer (Redis Cluster Fix)', () => {
+    test('should reorder out-of-sequence messages', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'reorder-test';
+      const receivedEvents: number[] = [];
+
+      transport.subscribe(streamId, {
+        onChunk: (event) => receivedEvents.push((event as { index: number }).index),
+      });
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1] as (channel: string, message: string) => void;
+
+      const channel = `stream:{${streamId}}:events`;
+
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 0, data: { index: 0 } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 2, data: { index: 2 } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 1, data: { index: 1 } }));
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      expect(receivedEvents).toEqual([0, 1, 2]);
+
+      transport.destroy();
+    });
+
+    test('should buffer early messages and deliver when gaps are filled', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'buffer-test';
+      const receivedEvents: number[] = [];
+
+      transport.subscribe(streamId, {
+        onChunk: (event) => receivedEvents.push((event as { index: number }).index),
+      });
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1] as (channel: string, message: string) => void;
+
+      const channel = `stream:{${streamId}}:events`;
+
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 2, data: { index: 2 } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 4, data: { index: 4 } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 3, data: { index: 3 } }));
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+      expect(receivedEvents).toEqual([]);
+
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 0, data: { index: 0 } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 1, data: { index: 1 } }));
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+      expect(receivedEvents).toEqual([0, 1, 2, 3, 4]);
+
+      transport.destroy();
+    });
+
+    test('should force-flush on timeout when gaps are not filled', async () => {
+      jest.useFakeTimers();
+
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'timeout-test';
+      const receivedEvents: number[] = [];
+
+      transport.subscribe(streamId, {
+        onChunk: (event) => receivedEvents.push((event as { index: number }).index),
+      });
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1] as (channel: string, message: string) => void;
+
+      const channel = `stream:{${streamId}}:events`;
+
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 2, data: { index: 2 } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 3, data: { index: 3 } }));
+
+      expect(receivedEvents).toEqual([]);
+
+      jest.advanceTimersByTime(600);
+
+      expect(receivedEvents).toEqual([2, 3]);
+
+      transport.destroy();
+      jest.useRealTimers();
+    });
+
+    test('should handle messages without sequence numbers (backward compatibility)', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'compat-test';
+      const receivedEvents: string[] = [];
+
+      transport.subscribe(streamId, {
+        onChunk: (event) => receivedEvents.push((event as { msg: string }).msg),
+        onDone: (event) => receivedEvents.push(`done:${(event as { msg: string }).msg}`),
+      });
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1] as (channel: string, message: string) => void;
+
+      const channel = `stream:{${streamId}}:events`;
+
+      messageHandler(channel, JSON.stringify({ type: 'chunk', data: { msg: 'no-seq-1' } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', data: { msg: 'no-seq-2' } }));
+      messageHandler(channel, JSON.stringify({ type: 'done', data: { msg: 'finished' } }));
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      expect(receivedEvents).toEqual(['no-seq-1', 'no-seq-2', 'done:finished']);
+
+      transport.destroy();
+    });
+
+    test('should deliver done event after all pending chunks (terminal event ordering)', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+        on: jest.fn(),
+      };
+
+      const transport = new RedisEventTransport(mockPublisher as never, mockSubscriber as never);
+      const streamId = `terminal-order-${Date.now()}`;
+
+      const receivedEvents: string[] = [];
+      let doneReceived = false;
+
+      transport.subscribe(streamId, {
+        onChunk: (event: unknown) => {
+          const e = event as { msg?: string };
+          receivedEvents.push(e.msg ?? 'unknown');
+        },
+        onDone: (event: unknown) => {
+          const e = event as { msg?: string };
+          receivedEvents.push(`done:${e.msg ?? 'finished'}`);
+          doneReceived = true;
+        },
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1];
+      expect(messageHandler).toBeDefined();
+
+      const channel = `stream:{${streamId}}:events`;
+
+      // Simulate out-of-order delivery in Redis Cluster:
+      // Done event (seq=3) arrives before chunk seq=2
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 0, data: { msg: 'chunk-0' } }));
+      messageHandler(channel, JSON.stringify({ type: 'done', seq: 3, data: { msg: 'complete' } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 2, data: { msg: 'chunk-2' } }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 1, data: { msg: 'chunk-1' } }));
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Done event should be delivered AFTER all chunks despite arriving early
+      expect(doneReceived).toBe(true);
+      expect(receivedEvents).toEqual(['chunk-0', 'chunk-1', 'chunk-2', 'done:complete']);
+
+      transport.destroy();
+    });
+
+    test('should deliver error event after all pending chunks (terminal event ordering)', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+        on: jest.fn(),
+      };
+
+      const transport = new RedisEventTransport(mockPublisher as never, mockSubscriber as never);
+      const streamId = `terminal-error-${Date.now()}`;
+
+      const receivedEvents: string[] = [];
+      let errorReceived: string | undefined;
+
+      transport.subscribe(streamId, {
+        onChunk: (event: unknown) => {
+          const e = event as { msg?: string };
+          receivedEvents.push(e.msg ?? 'unknown');
+        },
+        onError: (error: string) => {
+          receivedEvents.push(`error:${error}`);
+          errorReceived = error;
+        },
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1];
+      expect(messageHandler).toBeDefined();
+
+      const channel = `stream:{${streamId}}:events`;
+
+      // Simulate out-of-order delivery: error arrives before final chunks
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 0, data: { msg: 'chunk-0' } }));
+      messageHandler(channel, JSON.stringify({ type: 'error', seq: 2, error: 'Something failed' }));
+      messageHandler(channel, JSON.stringify({ type: 'chunk', seq: 1, data: { msg: 'chunk-1' } }));
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Error event should be delivered AFTER all preceding chunks
+      expect(errorReceived).toBe('Something failed');
+      expect(receivedEvents).toEqual(['chunk-0', 'chunk-1', 'error:Something failed']);
+
+      transport.destroy();
+    });
+  });
+
   describe('Subscriber Management', () => {
     test('should track first subscriber correctly', async () => {
       if (!ioredisClient) {
@@ -283,7 +705,7 @@ describe('RedisEventTransport Integration Tests', () => {
 
       await new Promise((resolve) => setTimeout(resolve, 100));
 
-      transport.emitError(streamId, 'Test error message');
+      await transport.emitError(streamId, 'Test error message');
 
       await new Promise((resolve) => setTimeout(resolve, 200));
 
@@ -471,4 +893,121 @@ describe('RedisEventTransport Integration Tests', () => {
       subscriber.disconnect();
     });
   });
+
+  describe('Publish Error Propagation', () => {
+    test('should swallow emitChunk publish errors (callers fire-and-forget)', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockRejectedValue(new Error('Redis connection lost')),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = `error-prop-chunk-${Date.now()}`;
+
+      // emitChunk swallows errors because callers often fire-and-forget (no await).
+      // Throwing would cause unhandled promise rejections.
+      await expect(transport.emitChunk(streamId, { data: 'test' })).resolves.toBeUndefined();
+
+      transport.destroy();
+    });
+
+    test('should throw when emitDone publish fails', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockRejectedValue(new Error('Redis connection lost')),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = `error-prop-done-${Date.now()}`;
+
+      await expect(transport.emitDone(streamId, { finished: true })).rejects.toThrow(
+        'Redis connection lost',
+      );
+
+      transport.destroy();
+    });
+
+    test('should throw when emitError publish fails', async () => {
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const mockPublisher = {
+        publish: jest.fn().mockRejectedValue(new Error('Redis connection lost')),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = `error-prop-error-${Date.now()}`;
+
+      await expect(transport.emitError(streamId, 'some error')).rejects.toThrow(
+        'Redis connection lost',
+      );
+
+      transport.destroy();
+    });
+
+    test('should still deliver events successfully when publish succeeds', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const { RedisEventTransport } = await import('../implementations/RedisEventTransport');
+
+      const subscriber = (ioredisClient as Redis).duplicate();
+      const transport = new RedisEventTransport(ioredisClient, subscriber);
+
+      const streamId = `error-prop-success-${Date.now()}`;
+      const receivedChunks: unknown[] = [];
+      let doneEvent: unknown = null;
+
+      transport.subscribe(streamId, {
+        onChunk: (event) => receivedChunks.push(event),
+        onDone: (event) => {
+          doneEvent = event;
+        },
+      });
+
+      await new Promise((resolve) => setTimeout(resolve, 200));
+
+      // These should NOT throw
+      await transport.emitChunk(streamId, { text: 'hello' });
+      await transport.emitDone(streamId, { finished: true });
+
+      await new Promise((resolve) => setTimeout(resolve, 200));
+
+      expect(receivedChunks.length).toBe(1);
+      expect(doneEvent).toEqual({ finished: true });
+
+      transport.destroy();
+      subscriber.disconnect();
+    });
+  });
 });
diff --git a/packages/api/src/stream/__tests__/RedisJobStore.stream_integration.spec.ts b/packages/api/src/stream/__tests__/RedisJobStore.stream_integration.spec.ts
index 89c6f9e92e..a64ba11f26 100644
--- a/packages/api/src/stream/__tests__/RedisJobStore.stream_integration.spec.ts
+++ b/packages/api/src/stream/__tests__/RedisJobStore.stream_integration.spec.ts
@@ -24,8 +24,11 @@ describe('RedisJobStore Integration Tests', () => {
 
     // Set up test environment
     process.env.USE_REDIS = process.env.USE_REDIS ?? 'true';
+    process.env.USE_REDIS_CLUSTER = process.env.USE_REDIS_CLUSTER ?? 'false';
     process.env.REDIS_URI = process.env.REDIS_URI ?? 'redis://127.0.0.1:6379';
     process.env.REDIS_KEY_PREFIX = testPrefix;
+    process.env.REDIS_PING_INTERVAL = '0';
+    process.env.REDIS_RETRY_MAX_ATTEMPTS = '5';
 
     jest.resetModules();
 
@@ -880,6 +883,67 @@ describe('RedisJobStore Integration Tests', () => {
     });
   });
 
+  describe('Race Condition: updateJob after deleteJob', () => {
+    test('should not re-create job hash when updateJob runs after deleteJob', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const { RedisJobStore } = await import('../implementations/RedisJobStore');
+      const store = new RedisJobStore(ioredisClient);
+      await store.initialize();
+
+      const streamId = `race-condition-${Date.now()}`;
+      await store.createJob(streamId, 'user-1', streamId);
+
+      const jobKey = `stream:{${streamId}}:job`;
+      const ttlBefore = await ioredisClient.ttl(jobKey);
+      expect(ttlBefore).toBeGreaterThan(0);
+
+      await store.deleteJob(streamId);
+
+      const afterDelete = await ioredisClient.exists(jobKey);
+      expect(afterDelete).toBe(0);
+
+      await store.updateJob(streamId, { finalEvent: JSON.stringify({ final: true }) });
+
+      const afterUpdate = await ioredisClient.exists(jobKey);
+      expect(afterUpdate).toBe(0);
+
+      await store.destroy();
+    });
+
+    test('should not leave orphan keys from concurrent emitDone and deleteJob', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const { RedisJobStore } = await import('../implementations/RedisJobStore');
+      const store = new RedisJobStore(ioredisClient);
+      await store.initialize();
+
+      const streamId = `concurrent-race-${Date.now()}`;
+      await store.createJob(streamId, 'user-1', streamId);
+
+      const jobKey = `stream:{${streamId}}:job`;
+
+      await Promise.all([
+        store.updateJob(streamId, { finalEvent: JSON.stringify({ final: true }) }),
+        store.deleteJob(streamId),
+      ]);
+
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      const exists = await ioredisClient.exists(jobKey);
+      const ttl = exists ? await ioredisClient.ttl(jobKey) : -2;
+
+      expect(ttl === -2 || ttl > 0).toBe(true);
+      expect(ttl).not.toBe(-1);
+
+      await store.destroy();
+    });
+  });
+
   describe('Local Graph Cache Optimization', () => {
     test('should use local cache when available', async () => {
       if (!ioredisClient) {
@@ -972,4 +1036,196 @@ describe('RedisJobStore Integration Tests', () => {
       await instance2.destroy();
     });
   });
+
+  describe('Batched Cleanup', () => {
+    test('should clean up many stale jobs in parallel batches', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const { RedisJobStore } = await import('../implementations/RedisJobStore');
+      // Very short TTL so jobs are immediately stale
+      const store = new RedisJobStore(ioredisClient, { runningTtl: 1 });
+      await store.initialize();
+
+      const jobCount = 75; // More than one batch of 50
+      const veryOldTimestamp = Date.now() - 10000; // 10 seconds ago
+
+      // Create many stale jobs directly in Redis
+      for (let i = 0; i < jobCount; i++) {
+        const streamId = `batch-cleanup-${Date.now()}-${i}`;
+        const jobKey = `stream:{${streamId}}:job`;
+        await ioredisClient.hmset(jobKey, {
+          streamId,
+          userId: 'batch-user',
+          status: 'running',
+          createdAt: veryOldTimestamp.toString(),
+          syncSent: '0',
+        });
+        await ioredisClient.sadd('stream:running', streamId);
+      }
+
+      // Verify jobs are in the running set
+      const runningBefore = await ioredisClient.scard('stream:running');
+      expect(runningBefore).toBeGreaterThanOrEqual(jobCount);
+
+      // Run cleanup - should process in batches of 50
+      const cleaned = await store.cleanup();
+      expect(cleaned).toBeGreaterThanOrEqual(jobCount);
+
+      await store.destroy();
+    });
+
+    test('should not clean up valid running jobs during batch cleanup', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const { RedisJobStore } = await import('../implementations/RedisJobStore');
+      const store = new RedisJobStore(ioredisClient, { runningTtl: 1200 });
+      await store.initialize();
+
+      // Create a mix of valid and stale jobs
+      const validStreamId = `valid-job-${Date.now()}`;
+      await store.createJob(validStreamId, 'user-1', validStreamId);
+
+      const staleStreamId = `stale-job-${Date.now()}`;
+      const jobKey = `stream:{${staleStreamId}}:job`;
+      await ioredisClient.hmset(jobKey, {
+        streamId: staleStreamId,
+        userId: 'user-1',
+        status: 'running',
+        createdAt: (Date.now() - 2000000).toString(), // Very old
+        syncSent: '0',
+      });
+      await ioredisClient.sadd('stream:running', staleStreamId);
+
+      const cleaned = await store.cleanup();
+      expect(cleaned).toBeGreaterThanOrEqual(1);
+
+      // Valid job should still exist
+      const validJob = await store.getJob(validStreamId);
+      expect(validJob).not.toBeNull();
+      expect(validJob?.status).toBe('running');
+
+      await store.destroy();
+    });
+  });
+
+  describe('appendChunk TTL Refresh', () => {
+    test('should set TTL on the chunk stream', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const { RedisJobStore } = await import('../implementations/RedisJobStore');
+      const store = new RedisJobStore(ioredisClient, { runningTtl: 120 });
+      await store.initialize();
+
+      const streamId = `append-ttl-${Date.now()}`;
+      await store.createJob(streamId, 'user-1', streamId);
+
+      await store.appendChunk(streamId, {
+        event: 'on_message_delta',
+        data: { id: 'step-1', type: 'text', text: 'first' },
+      });
+
+      const chunkKey = `stream:{${streamId}}:chunks`;
+      const ttl = await ioredisClient.ttl(chunkKey);
+      expect(ttl).toBeGreaterThan(0);
+      expect(ttl).toBeLessThanOrEqual(120);
+
+      await store.destroy();
+    });
+
+    test('should refresh TTL on subsequent chunks (not just first)', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const { RedisJobStore } = await import('../implementations/RedisJobStore');
+      const store = new RedisJobStore(ioredisClient, { runningTtl: 120 });
+      await store.initialize();
+
+      const streamId = `append-refresh-${Date.now()}`;
+      await store.createJob(streamId, 'user-1', streamId);
+
+      // Append first chunk
+      await store.appendChunk(streamId, {
+        event: 'on_message_delta',
+        data: { id: 'step-1', type: 'text', text: 'first' },
+      });
+
+      const chunkKey = `stream:{${streamId}}:chunks`;
+      const ttl1 = await ioredisClient.ttl(chunkKey);
+      expect(ttl1).toBeGreaterThan(0);
+
+      // Manually reduce TTL to simulate time passing
+      await ioredisClient.expire(chunkKey, 30);
+      const reducedTtl = await ioredisClient.ttl(chunkKey);
+      expect(reducedTtl).toBeLessThanOrEqual(30);
+
+      // Append another chunk - TTL should be refreshed back to running TTL
+      await store.appendChunk(streamId, {
+        event: 'on_message_delta',
+        data: { id: 'step-1', type: 'text', text: 'second' },
+      });
+
+      const ttl2 = await ioredisClient.ttl(chunkKey);
+      // Should be refreshed to ~120, not still ~30
+      expect(ttl2).toBeGreaterThan(30);
+      expect(ttl2).toBeLessThanOrEqual(120);
+
+      await store.destroy();
+    });
+
+    test('should store chunks correctly via pipeline', async () => {
+      if (!ioredisClient) {
+        return;
+      }
+
+      const { RedisJobStore } = await import('../implementations/RedisJobStore');
+      const store = new RedisJobStore(ioredisClient);
+      await store.initialize();
+
+      const streamId = `append-pipeline-${Date.now()}`;
+      await store.createJob(streamId, 'user-1', streamId);
+
+      const chunks = [
+        {
+          event: 'on_run_step',
+          data: {
+            id: 'step-1',
+            runId: 'run-1',
+            index: 0,
+            stepDetails: { type: 'message_creation' },
+          },
+        },
+        {
+          event: 'on_message_delta',
+          data: { id: 'step-1', delta: { content: { type: 'text', text: 'Hello ' } } },
+        },
+        {
+          event: 'on_message_delta',
+          data: { id: 'step-1', delta: { content: { type: 'text', text: 'world!' } } },
+        },
+      ];
+
+      for (const chunk of chunks) {
+        await store.appendChunk(streamId, chunk);
+      }
+
+      // Verify all chunks were stored
+      const chunkKey = `stream:{${streamId}}:chunks`;
+      const len = await ioredisClient.xlen(chunkKey);
+      expect(len).toBe(3);
+
+      // Verify content can be reconstructed
+      const content = await store.getContentParts(streamId);
+      expect(content).not.toBeNull();
+      expect(content!.content.length).toBeGreaterThan(0);
+
+      await store.destroy();
+    });
+  });
 });
diff --git a/packages/api/src/stream/__tests__/collectedUsage.spec.ts b/packages/api/src/stream/__tests__/collectedUsage.spec.ts
new file mode 100644
index 0000000000..d9a9ab95fe
--- /dev/null
+++ b/packages/api/src/stream/__tests__/collectedUsage.spec.ts
@@ -0,0 +1,482 @@
+/**
+ * Tests for collected usage functionality in GenerationJobManager.
+ *
+ * This tests the storage and retrieval of collectedUsage for abort handling,
+ * ensuring all models (including parallel agents from addedConvo) have their
+ * tokens spent when a conversation is aborted.
+ */
+
+import type { UsageMetadata } from '../interfaces/IJobStore';
+
+describe('CollectedUsage - InMemoryJobStore', () => {
+  beforeEach(() => {
+    jest.resetModules();
+  });
+
+  it('should store and retrieve collectedUsage', async () => {
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const store = new InMemoryJobStore();
+    await store.initialize();
+
+    const streamId = 'test-stream-1';
+    await store.createJob(streamId, 'user-1');
+
+    const collectedUsage: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+    ];
+
+    store.setCollectedUsage(streamId, collectedUsage);
+    const retrieved = store.getCollectedUsage(streamId);
+
+    expect(retrieved).toEqual(collectedUsage);
+    expect(retrieved).toHaveLength(2);
+
+    await store.destroy();
+  });
+
+  it('should return empty array when no collectedUsage set', async () => {
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const store = new InMemoryJobStore();
+    await store.initialize();
+
+    const streamId = 'test-stream-2';
+    await store.createJob(streamId, 'user-1');
+
+    const retrieved = store.getCollectedUsage(streamId);
+
+    expect(retrieved).toEqual([]);
+
+    await store.destroy();
+  });
+
+  it('should return empty array for non-existent stream', async () => {
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const store = new InMemoryJobStore();
+    await store.initialize();
+
+    const retrieved = store.getCollectedUsage('non-existent-stream');
+
+    expect(retrieved).toEqual([]);
+
+    await store.destroy();
+  });
+
+  it('should update collectedUsage when set multiple times', async () => {
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const store = new InMemoryJobStore();
+    await store.initialize();
+
+    const streamId = 'test-stream-3';
+    await store.createJob(streamId, 'user-1');
+
+    const usage1: UsageMetadata[] = [{ input_tokens: 100, output_tokens: 50, model: 'gpt-4' }];
+    store.setCollectedUsage(streamId, usage1);
+
+    // Simulate more usage being added
+    const usage2: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+    ];
+    store.setCollectedUsage(streamId, usage2);
+
+    const retrieved = store.getCollectedUsage(streamId);
+    expect(retrieved).toHaveLength(2);
+
+    await store.destroy();
+  });
+
+  it('should clear collectedUsage when clearContentState is called', async () => {
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const store = new InMemoryJobStore();
+    await store.initialize();
+
+    const streamId = 'test-stream-4';
+    await store.createJob(streamId, 'user-1');
+
+    const collectedUsage: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+    ];
+    store.setCollectedUsage(streamId, collectedUsage);
+
+    expect(store.getCollectedUsage(streamId)).toHaveLength(1);
+
+    store.clearContentState(streamId);
+
+    expect(store.getCollectedUsage(streamId)).toEqual([]);
+
+    await store.destroy();
+  });
+
+  it('should clear collectedUsage when job is deleted', async () => {
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const store = new InMemoryJobStore();
+    await store.initialize();
+
+    const streamId = 'test-stream-5';
+    await store.createJob(streamId, 'user-1');
+
+    const collectedUsage: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+    ];
+    store.setCollectedUsage(streamId, collectedUsage);
+
+    await store.deleteJob(streamId);
+
+    expect(store.getCollectedUsage(streamId)).toEqual([]);
+
+    await store.destroy();
+  });
+});
+
+describe('CollectedUsage - GenerationJobManager', () => {
+  beforeEach(() => {
+    jest.resetModules();
+  });
+
+  it('should set and retrieve collectedUsage through manager', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `manager-test-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    const collectedUsage: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+    ];
+
+    GenerationJobManager.setCollectedUsage(streamId, collectedUsage);
+
+    // Retrieve through abort
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    expect(abortResult.collectedUsage).toEqual(collectedUsage);
+    expect(abortResult.collectedUsage).toHaveLength(2);
+
+    await GenerationJobManager.destroy();
+  });
+
+  it('should return empty collectedUsage when none set', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `no-usage-test-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    expect(abortResult.collectedUsage).toEqual([]);
+
+    await GenerationJobManager.destroy();
+  });
+
+  it('should not set collectedUsage if job does not exist', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const collectedUsage: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+    ];
+
+    // This should not throw, just silently do nothing
+    GenerationJobManager.setCollectedUsage('non-existent-stream', collectedUsage);
+
+    const abortResult = await GenerationJobManager.abortJob('non-existent-stream');
+    expect(abortResult.success).toBe(false);
+
+    await GenerationJobManager.destroy();
+  });
+});
+
+describe('AbortJob - Text and CollectedUsage', () => {
+  beforeEach(() => {
+    jest.resetModules();
+  });
+
+  it('should extract text from content parts on abort', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `text-extract-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    // Set content parts with text
+    const contentParts = [
+      { type: 'text', text: 'Hello ' },
+      { type: 'text', text: 'world!' },
+    ];
+    GenerationJobManager.setContentParts(streamId, contentParts as never);
+
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    expect(abortResult.text).toBe('Hello world!');
+    expect(abortResult.success).toBe(true);
+
+    await GenerationJobManager.destroy();
+  });
+
+  it('should return empty text when no content parts', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `empty-text-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    expect(abortResult.text).toBe('');
+
+    await GenerationJobManager.destroy();
+  });
+
+  it('should return both text and collectedUsage on abort', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `full-abort-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    // Set content parts
+    const contentParts = [{ type: 'text', text: 'Partial response...' }];
+    GenerationJobManager.setContentParts(streamId, contentParts as never);
+
+    // Set collected usage
+    const collectedUsage: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' },
+      { input_tokens: 80, output_tokens: 40, model: 'claude-3' },
+    ];
+    GenerationJobManager.setCollectedUsage(streamId, collectedUsage);
+
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    expect(abortResult.success).toBe(true);
+    expect(abortResult.text).toBe('Partial response...');
+    expect(abortResult.collectedUsage).toEqual(collectedUsage);
+    expect(abortResult.content).toHaveLength(1);
+
+    await GenerationJobManager.destroy();
+  });
+
+  it('should return empty values for non-existent job', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const abortResult = await GenerationJobManager.abortJob('non-existent-job');
+
+    expect(abortResult.success).toBe(false);
+    expect(abortResult.text).toBe('');
+    expect(abortResult.collectedUsage).toEqual([]);
+    expect(abortResult.content).toEqual([]);
+    expect(abortResult.jobData).toBeNull();
+
+    await GenerationJobManager.destroy();
+  });
+});
+
+describe('Real-world Scenarios', () => {
+  beforeEach(() => {
+    jest.resetModules();
+  });
+
+  it('should handle parallel agent abort with collected usage', async () => {
+    /**
+     * Scenario: User aborts a conversation with addedConvo (parallel agents)
+     * - Primary agent: gemini-3-flash-preview
+     * - Parallel agent: gpt-5.2
+     * Both should have their tokens spent on abort
+     */
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `parallel-abort-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    // Simulate content from primary agent
+    const contentParts = [
+      { type: 'text', text: 'Primary agent output...' },
+      { type: 'text', text: 'More content...' },
+    ];
+    GenerationJobManager.setContentParts(streamId, contentParts as never);
+
+    // Simulate collected usage from both agents (as would happen during generation)
+    const collectedUsage: UsageMetadata[] = [
+      {
+        input_tokens: 31596,
+        output_tokens: 151,
+        model: 'gemini-3-flash-preview',
+      },
+      {
+        input_tokens: 28000,
+        output_tokens: 120,
+        model: 'gpt-5.2',
+      },
+    ];
+    GenerationJobManager.setCollectedUsage(streamId, collectedUsage);
+
+    // Abort the job
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    // Verify both models' usage is returned
+    expect(abortResult.success).toBe(true);
+    expect(abortResult.collectedUsage).toHaveLength(2);
+    expect(abortResult.collectedUsage[0].model).toBe('gemini-3-flash-preview');
+    expect(abortResult.collectedUsage[1].model).toBe('gpt-5.2');
+
+    // Verify text is extracted
+    expect(abortResult.text).toContain('Primary agent output');
+
+    await GenerationJobManager.destroy();
+  });
+
+  it('should handle abort with cache tokens from Anthropic', async () => {
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `cache-abort-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    // Anthropic-style cache tokens
+    const collectedUsage: UsageMetadata[] = [
+      {
+        input_tokens: 788,
+        output_tokens: 163,
+        cache_creation_input_tokens: 30808,
+        cache_read_input_tokens: 0,
+        model: 'claude-opus-4-5-20251101',
+      },
+    ];
+    GenerationJobManager.setCollectedUsage(streamId, collectedUsage);
+
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    expect(abortResult.collectedUsage[0].cache_creation_input_tokens).toBe(30808);
+
+    await GenerationJobManager.destroy();
+  });
+
+  it('should handle abort with sequential tool calls usage', async () => {
+    /**
+     * Scenario: Single agent with multiple tool calls, aborted mid-execution
+     * Usage accumulates for each LLM call
+     */
+    const { GenerationJobManager } = await import('../GenerationJobManager');
+    const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
+    const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');
+
+    GenerationJobManager.configure({
+      jobStore: new InMemoryJobStore(),
+      eventTransport: new InMemoryEventTransport(),
+      isRedis: false,
+      cleanupOnComplete: false,
+    });
+
+    GenerationJobManager.initialize();
+
+    const streamId = `sequential-abort-${Date.now()}`;
+    await GenerationJobManager.createJob(streamId, 'user-1');
+
+    // Usage from multiple sequential LLM calls (tool use pattern)
+    const collectedUsage: UsageMetadata[] = [
+      { input_tokens: 100, output_tokens: 50, model: 'gpt-4' }, // Initial call
+      { input_tokens: 150, output_tokens: 30, model: 'gpt-4' }, // After tool result 1
+      { input_tokens: 180, output_tokens: 20, model: 'gpt-4' }, // After tool result 2 (aborted here)
+    ];
+    GenerationJobManager.setCollectedUsage(streamId, collectedUsage);
+
+    const abortResult = await GenerationJobManager.abortJob(streamId);
+
+    expect(abortResult.collectedUsage).toHaveLength(3);
+    // All three entries should be present for proper token accounting
+
+    await GenerationJobManager.destroy();
+  });
+});
diff --git a/packages/api/src/stream/__tests__/reconnect-reorder-desync.stream_integration.spec.ts b/packages/api/src/stream/__tests__/reconnect-reorder-desync.stream_integration.spec.ts
new file mode 100644
index 0000000000..effb7c5c7d
--- /dev/null
+++ b/packages/api/src/stream/__tests__/reconnect-reorder-desync.stream_integration.spec.ts
@@ -0,0 +1,450 @@
+import type { Redis, Cluster } from 'ioredis';
+import { RedisEventTransport } from '~/stream/implementations/RedisEventTransport';
+import { GenerationJobManagerClass } from '~/stream/GenerationJobManager';
+import { createStreamServices } from '~/stream/createStreamServices';
+import {
+  ioredisClient as staticRedisClient,
+  keyvRedisClient as staticKeyvClient,
+  keyvRedisClientReady,
+} from '~/cache/redisClients';
+
+/**
+ * Regression tests for the reconnect reorder buffer desync bug.
+ *
+ * Bug: When a user disconnects and reconnects to a stream multiple times,
+ * the second+ reconnect lost chunks because the transport deleted stream state
+ * on last unsubscribe, destroying the allSubscribersLeftCallbacks registered
+ * by createJob(). This prevented hasSubscriber from being reset, which in turn
+ * prevented syncReorderBuffer from being called on reconnect.
+ *
+ * Fix: Preserve stream state (callbacks, abort handlers) across reconnect cycles
+ * instead of deleting it. The state is fully cleaned up by cleanup() when the
+ * job completes.
+ *
+ * Run with: USE_REDIS=true npx jest reconnect-reorder-desync
+ */
+describe('Reconnect Reorder Buffer Desync (Regression)', () => {
+  describe('Callback preservation across reconnect cycles (Unit)', () => {
+    test('allSubscribersLeft callback fires on every disconnect, not just the first', () => {
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'callback-persist-test';
+      let callbackFireCount = 0;
+
+      // Register callback (simulates what createJob does)
+      transport.onAllSubscribersLeft(streamId, () => {
+        callbackFireCount++;
+      });
+
+      // First subscribe/unsubscribe cycle
+      const sub1 = transport.subscribe(streamId, { onChunk: () => {} });
+      sub1.unsubscribe();
+
+      expect(callbackFireCount).toBe(1);
+
+      // Second subscribe/unsubscribe cycle — callback must still fire
+      const sub2 = transport.subscribe(streamId, { onChunk: () => {} });
+      sub2.unsubscribe();
+
+      expect(callbackFireCount).toBe(2);
+
+      // Third cycle — continues to work
+      const sub3 = transport.subscribe(streamId, { onChunk: () => {} });
+      sub3.unsubscribe();
+
+      expect(callbackFireCount).toBe(3);
+
+      transport.destroy();
+    });
+
+    test('abort callback survives across reconnect cycles', () => {
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'abort-callback-persist-test';
+      let abortCallbackFired = false;
+
+      // Register abort callback (simulates what createJob does)
+      transport.onAbort(streamId, () => {
+        abortCallbackFired = true;
+      });
+
+      // Subscribe/unsubscribe cycle
+      const sub1 = transport.subscribe(streamId, { onChunk: () => {} });
+      sub1.unsubscribe();
+
+      // Re-subscribe and receive an abort signal
+      const sub2 = transport.subscribe(streamId, { onChunk: () => {} });
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1] as (channel: string, message: string) => void;
+
+      const channel = `stream:{${streamId}}:events`;
+      messageHandler(channel, JSON.stringify({ type: 'abort' }));
+
+      // Abort callback should fire — it was preserved across the reconnect
+      expect(abortCallbackFired).toBe(true);
+
+      sub2.unsubscribe();
+      transport.destroy();
+    });
+  });
+
+  describe('Reorder buffer sync on reconnect (Unit)', () => {
+    /**
+     * After the fix, the allSubscribersLeft callback fires on every disconnect,
+     * which resets hasSubscriber. GenerationJobManager.subscribe() then enters
+     * the if (!runtime.hasSubscriber) block and calls syncReorderBuffer.
+     *
+     * This test verifies at the transport level that when syncReorderBuffer IS
+     * called (as it now will be on every reconnect), messages are delivered
+     * immediately regardless of how many reconnect cycles have occurred.
+     */
+    test('syncReorderBuffer works correctly on third+ reconnect', async () => {
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'reorder-multi-reconnect-test';
+
+      transport.onAllSubscribersLeft(streamId, () => {
+        // Simulates the callback from createJob
+      });
+
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1] as (channel: string, message: string) => void;
+
+      const channel = `stream:{${streamId}}:events`;
+
+      // Run 3 full subscribe/emit/unsubscribe cycles
+      for (let cycle = 0; cycle < 3; cycle++) {
+        const chunks: unknown[] = [];
+        const sub = transport.subscribe(streamId, {
+          onChunk: (event) => chunks.push(event),
+        });
+
+        // Sync reorder buffer (as GenerationJobManager.subscribe does)
+        transport.syncReorderBuffer(streamId);
+
+        const baseSeq = cycle * 10;
+
+        // Emit 10 chunks (advances publisher sequence)
+        for (let i = 0; i < 10; i++) {
+          await transport.emitChunk(streamId, { index: baseSeq + i });
+        }
+
+        // Deliver messages via pub/sub handler
+        for (let i = 0; i < 10; i++) {
+          messageHandler(
+            channel,
+            JSON.stringify({ type: 'chunk', seq: baseSeq + i, data: { index: baseSeq + i } }),
+          );
+        }
+
+        // Messages should be delivered immediately on every cycle
+        expect(chunks.length).toBe(10);
+        expect(chunks.map((c) => (c as { index: number }).index)).toEqual(
+          Array.from({ length: 10 }, (_, i) => baseSeq + i),
+        );
+
+        sub.unsubscribe();
+      }
+
+      transport.destroy();
+    });
+
+    test('reorder buffer works correctly when syncReorderBuffer IS called', async () => {
+      const mockPublisher = {
+        publish: jest.fn().mockResolvedValue(1),
+      };
+      const mockSubscriber = {
+        on: jest.fn(),
+        subscribe: jest.fn().mockResolvedValue(undefined),
+        unsubscribe: jest.fn().mockResolvedValue(undefined),
+      };
+
+      const transport = new RedisEventTransport(
+        mockPublisher as unknown as Redis,
+        mockSubscriber as unknown as Redis,
+      );
+
+      const streamId = 'reorder-sync-test';
+
+      // Emit 20 chunks to advance publisher sequence
+      for (let i = 0; i < 20; i++) {
+        await transport.emitChunk(streamId, { index: i });
+      }
+
+      // Subscribe and sync the reorder buffer
+      const chunks: unknown[] = [];
+      const sub = transport.subscribe(streamId, {
+        onChunk: (event) => chunks.push(event),
+      });
+
+      // This is the critical call - sync nextSeq to match publisher
+      transport.syncReorderBuffer(streamId);
+
+      // Deliver messages starting at seq 20
+      const messageHandler = mockSubscriber.on.mock.calls.find(
+        (call) => call[0] === 'message',
+      )?.[1] as (channel: string, message: string) => void;
+
+      const channel = `stream:{${streamId}}:events`;
+
+      for (let i = 20; i < 25; i++) {
+        messageHandler(channel, JSON.stringify({ type: 'chunk', seq: i, data: { index: i } }));
+      }
+
+      // Messages should be delivered IMMEDIATELY (no 500ms wait)
+      // because nextSeq was synced to 20
+      expect(chunks.length).toBe(5);
+      expect(chunks.map((c) => (c as { index: number }).index)).toEqual([20, 21, 22, 23, 24]);
+
+      sub.unsubscribe();
+      transport.destroy();
+    });
+  });
+
+  describe('End-to-end reconnect with GenerationJobManager (Integration)', () => {
+    let originalEnv: NodeJS.ProcessEnv;
+    let ioredisClient: Redis | Cluster | null = null;
+    let dynamicKeyvClient: unknown = null;
+    let dynamicKeyvReady: Promise<unknown> | null = null;
+    const testPrefix = 'ReconnectDesync-Test';
+
+    beforeAll(async () => {
+      originalEnv = { ...process.env };
+
+      process.env.USE_REDIS = process.env.USE_REDIS ?? 'true';
+      process.env.REDIS_URI = process.env.REDIS_URI ?? 'redis://127.0.0.1:6379';
+      process.env.REDIS_KEY_PREFIX = testPrefix;
+
+      jest.resetModules();
+
+      const redisModule = await import('~/cache/redisClients');
+      ioredisClient = redisModule.ioredisClient;
+      dynamicKeyvClient = redisModule.keyvRedisClient;
+      dynamicKeyvReady = redisModule.keyvRedisClientReady;
+    });
+
+    afterEach(async () => {
+      jest.resetModules();
+
+      if (ioredisClient) {
+        try {
+          const keys = await ioredisClient.keys(`${testPrefix}*`);
+          const streamKeys = await ioredisClient.keys('stream:*');
+          const allKeys = [...keys, ...streamKeys];
+          await Promise.all(allKeys.map((key) => ioredisClient!.del(key)));
+        } catch {
+          // Ignore cleanup errors
+        }
+      }
+    });
+
+    afterAll(async () => {
+      for (const ready of [keyvRedisClientReady, dynamicKeyvReady]) {
+        if (ready) {
+          await ready.catch(() => {});
+        }
+      }
+
+      const clients = [ioredisClient, staticRedisClient, staticKeyvClient, dynamicKeyvClient];
+      for (const client of clients) {
+        if (!client) {
+          continue;
+        }
+        try {
+          await (client as { disconnect: () => void | Promise<void> }).disconnect();
+        } catch {
+          /* ignore */
+        }
+      }
+
+      process.env = originalEnv;
+    });
+
+    /**
+     * Verifies that all reconnect cycles deliver chunks immediately —
+     * not just the first reconnect.
+     */
+    test('chunks are delivered immediately on every reconnect cycle', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const manager = new GenerationJobManagerClass();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      manager.configure(services);
+      manager.initialize();
+
+      const streamId = `reconnect-fixed-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      // Run 3 subscribe/emit/unsubscribe cycles
+      for (let cycle = 0; cycle < 3; cycle++) {
+        const chunks: unknown[] = [];
+        const sub = await manager.subscribe(streamId, (event) => chunks.push(event));
+
+        await new Promise((resolve) => setTimeout(resolve, 100));
+
+        // Emit 10 chunks
+        for (let i = 0; i < 10; i++) {
+          await manager.emitChunk(streamId, {
+            event: 'on_message_delta',
+            data: {
+              delta: { content: { type: 'text', text: `c${cycle}-${i}` } },
+              index: cycle * 10 + i,
+            },
+          });
+        }
+
+        // Chunks should arrive within 200ms (well under the 500ms force-flush timeout)
+        await new Promise((resolve) => setTimeout(resolve, 200));
+
+        expect(chunks.length).toBe(10);
+
+        sub!.unsubscribe();
+        await new Promise((resolve) => setTimeout(resolve, 100));
+      }
+
+      await manager.destroy();
+    });
+
+    /**
+     * Verifies that syncSent is correctly reset on every disconnect,
+     * proving the onAllSubscribersLeft callback survives reconnect cycles.
+     */
+    test('onAllSubscribersLeft callback resets state on every disconnect', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const manager = new GenerationJobManagerClass();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      manager.configure(services);
+      manager.initialize();
+
+      const streamId = `callback-persist-integ-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      for (let cycle = 0; cycle < 3; cycle++) {
+        const sub = await manager.subscribe(streamId, () => {});
+        await new Promise((resolve) => setTimeout(resolve, 50));
+
+        // Mark sync as sent
+        manager.markSyncSent(streamId);
+        await new Promise((resolve) => setTimeout(resolve, 50));
+
+        let syncSent = await manager.wasSyncSent(streamId);
+        expect(syncSent).toBe(true);
+
+        // Disconnect
+        sub!.unsubscribe();
+        await new Promise((resolve) => setTimeout(resolve, 100));
+
+        // Callback should reset syncSent on every disconnect
+        syncSent = await manager.wasSyncSent(streamId);
+        expect(syncSent).toBe(false);
+      }
+
+      await manager.destroy();
+    });
+
+    /**
+     * Verifies all reconnect cycles deliver chunks immediately with no
+     * increasing gap pattern.
+     */
+    test('no increasing gap pattern across reconnect cycles', async () => {
+      if (!ioredisClient) {
+        console.warn('Redis not available, skipping test');
+        return;
+      }
+
+      const manager = new GenerationJobManagerClass();
+      const services = createStreamServices({
+        useRedis: true,
+        redisClient: ioredisClient,
+      });
+
+      manager.configure(services);
+      manager.initialize();
+
+      const streamId = `no-gaps-${Date.now()}`;
+      await manager.createJob(streamId, 'user-1');
+
+      const chunksPerCycle = 15;
+
+      for (let cycle = 0; cycle < 4; cycle++) {
+        const chunks: unknown[] = [];
+        const sub = await manager.subscribe(streamId, (event) => chunks.push(event));
+        await new Promise((resolve) => setTimeout(resolve, 100));
+
+        // Emit chunks
+        for (let i = 0; i < chunksPerCycle; i++) {
+          await manager.emitChunk(streamId, {
+            event: 'on_message_delta',
+            data: {
+              delta: { content: { type: 'text', text: `c${cycle}-${i}` } },
+              index: cycle * chunksPerCycle + i,
+            },
+          });
+        }
+
+        // All chunks should arrive within 200ms on every cycle
+        await new Promise((resolve) => setTimeout(resolve, 200));
+        expect(chunks.length).toBe(chunksPerCycle);
+
+        sub!.unsubscribe();
+        await new Promise((resolve) => setTimeout(resolve, 100));
+      }
+
+      await manager.destroy();
+    });
+  });
+});
diff --git a/packages/api/src/stream/implementations/InMemoryEventTransport.ts b/packages/api/src/stream/implementations/InMemoryEventTransport.ts
index fd9c65e239..c2e7ba01fd 100644
--- a/packages/api/src/stream/implementations/InMemoryEventTransport.ts
+++ b/packages/api/src/stream/implementations/InMemoryEventTransport.ts
@@ -32,7 +32,7 @@ export class InMemoryEventTransport implements IEventTransport {
       onDone?: (event: unknown) => void;
       onError?: (error: string) => void;
     },
-  ): { unsubscribe: () => void } {
+  ): { unsubscribe: () => void; ready?: Promise<void> } {
     const state = this.getOrCreateStream(streamId);
 
     const chunkHandler = (event: unknown) => handlers.onChunk(event);
@@ -58,9 +58,11 @@ export class InMemoryEventTransport implements IEventTransport {
           // Check if all subscribers left - cleanup and notify
           if (currentState.emitter.listenerCount('chunk') === 0) {
             currentState.allSubscribersLeftCallback?.();
-            // Auto-cleanup the stream entry when no subscribers remain
+            /* Remove all EventEmitter listeners but preserve stream state
+             * (including allSubscribersLeftCallback) for reconnection.
+             * State is fully cleaned up by cleanup() when the job completes.
+             */
             currentState.emitter.removeAllListeners();
-            this.streams.delete(streamId);
           }
         }
       },
@@ -79,7 +81,11 @@ export class InMemoryEventTransport implements IEventTransport {
 
   emitError(streamId: string, error: string): void {
     const state = this.streams.get(streamId);
-    state?.emitter.emit('error', error);
+    // Only emit if there are listeners - Node.js throws on unhandled 'error' events
+    // This is intentional for the race condition where error occurs before client connects
+    if (state?.emitter.listenerCount('error') ?? 0 > 0) {
+      state?.emitter.emit('error', error);
+    }
   }
 
   getSubscriberCount(streamId: string): number {
diff --git a/packages/api/src/stream/implementations/InMemoryJobStore.ts b/packages/api/src/stream/implementations/InMemoryJobStore.ts
index e4a5d5d3ad..cc82a69963 100644
--- a/packages/api/src/stream/implementations/InMemoryJobStore.ts
+++ b/packages/api/src/stream/implementations/InMemoryJobStore.ts
@@ -1,7 +1,12 @@
 import { logger } from '@librechat/data-schemas';
 import type { StandardGraph } from '@librechat/agents';
 import type { Agents } from 'librechat-data-provider';
-import type { IJobStore, SerializableJobData, JobStatus } from '~/stream/interfaces/IJobStore';
+import type {
+  SerializableJobData,
+  UsageMetadata,
+  IJobStore,
+  JobStatus,
+} from '~/stream/interfaces/IJobStore';
 
 /**
  * Content state for a job - volatile, in-memory only.
@@ -10,6 +15,7 @@ import type { IJobStore, SerializableJobData, JobStatus } from '~/stream/interfa
 interface ContentState {
   contentParts: Agents.MessageContentComplex[];
   graphRef: WeakRef<StandardGraph> | null;
+  collectedUsage: UsageMetadata[];
 }
 
 /**
@@ -240,6 +246,7 @@ export class InMemoryJobStore implements IJobStore {
       this.contentState.set(streamId, {
         contentParts: [],
         graphRef: new WeakRef(graph),
+        collectedUsage: [],
       });
     }
   }
@@ -252,10 +259,30 @@ export class InMemoryJobStore implements IJobStore {
     if (existing) {
       existing.contentParts = contentParts;
     } else {
-      this.contentState.set(streamId, { contentParts, graphRef: null });
+      this.contentState.set(streamId, { contentParts, graphRef: null, collectedUsage: [] });
     }
   }
 
+  /**
+   * Set collected usage reference for a job.
+   */
+  setCollectedUsage(streamId: string, collectedUsage: UsageMetadata[]): void {
+    const existing = this.contentState.get(streamId);
+    if (existing) {
+      existing.collectedUsage = collectedUsage;
+    } else {
+      this.contentState.set(streamId, { contentParts: [], graphRef: null, collectedUsage });
+    }
+  }
+
+  /**
+   * Get collected usage for a job.
+   */
+  getCollectedUsage(streamId: string): UsageMetadata[] {
+    const state = this.contentState.get(streamId);
+    return state?.collectedUsage ?? [];
+  }
+
   /**
    * Get content parts for a job.
    * Returns live content from stored reference.
diff --git a/packages/api/src/stream/implementations/RedisEventTransport.ts b/packages/api/src/stream/implementations/RedisEventTransport.ts
index 02d4cb69ed..3682a9a749 100644
--- a/packages/api/src/stream/implementations/RedisEventTransport.ts
+++ b/packages/api/src/stream/implementations/RedisEventTransport.ts
@@ -22,10 +22,30 @@ const EventTypes = {
 
 interface PubSubMessage {
   type: (typeof EventTypes)[keyof typeof EventTypes];
+  /** Sequence number for ordering (critical for Redis Cluster) */
+  seq?: number;
   data?: unknown;
   error?: string;
 }
 
+/**
+ * Reorder buffer state for a stream subscription.
+ * Handles out-of-order message delivery in Redis Cluster mode.
+ */
+interface ReorderBuffer {
+  /** Next expected sequence number */
+  nextSeq: number;
+  /** Buffered messages waiting for earlier sequences */
+  pending: Map<number, PubSubMessage>;
+  /** Timeout handle for flushing stale messages */
+  flushTimeout: ReturnType<typeof setTimeout> | null;
+}
+
+/** Max time (ms) to wait for out-of-order messages before force-flushing */
+const REORDER_TIMEOUT_MS = 500;
+/** Max messages to buffer before force-flushing (prevents memory issues) */
+const MAX_BUFFER_SIZE = 100;
+
 /**
  * Subscriber state for a stream
  */
@@ -42,6 +62,8 @@ interface StreamSubscribers {
   allSubscribersLeftCallbacks: Array<() => void>;
   /** Abort callbacks - called when abort signal is received from any replica */
   abortCallbacks: Array<() => void>;
+  /** Reorder buffer for handling out-of-order delivery in Redis Cluster */
+  reorderBuffer: ReorderBuffer;
 }
 
 /**
@@ -70,10 +92,12 @@ export class RedisEventTransport implements IEventTransport {
   private subscriber: Redis | Cluster;
   /** Track subscribers per stream */
   private streams = new Map<string, StreamSubscribers>();
-  /** Track which channels we're subscribed to */
-  private subscribedChannels = new Set<string>();
+  /** Track channel subscription state: resolved promise = active, pending = in-flight */
+  private channelSubscriptions = new Map<string, Promise<void>>();
   /** Counter for generating unique subscriber IDs */
   private subscriberIdCounter = 0;
+  /** Sequence counters per stream for publishing (ensures ordered delivery in cluster mode) */
+  private sequenceCounters = new Map<string, number>();
 
   /**
    * Create a new Redis event transport.
@@ -91,12 +115,45 @@ export class RedisEventTransport implements IEventTransport {
     });
   }
 
+  /** Get next sequence number for a stream (0-indexed) */
+  private getNextSequence(streamId: string): number {
+    const current = this.sequenceCounters.get(streamId) ?? 0;
+    this.sequenceCounters.set(streamId, current + 1);
+    return current;
+  }
+
+  /** Reset publish sequence counter and subscriber reorder state for a stream (full cleanup only) */
+  resetSequence(streamId: string): void {
+    this.sequenceCounters.delete(streamId);
+    const state = this.streams.get(streamId);
+    if (state) {
+      if (state.reorderBuffer.flushTimeout) {
+        clearTimeout(state.reorderBuffer.flushTimeout);
+        state.reorderBuffer.flushTimeout = null;
+      }
+      state.reorderBuffer.nextSeq = 0;
+      state.reorderBuffer.pending.clear();
+    }
+  }
+
+  /** Advance subscriber reorder buffer to current publisher sequence without resetting publisher (cross-replica safe) */
+  syncReorderBuffer(streamId: string): void {
+    const currentSeq = this.sequenceCounters.get(streamId) ?? 0;
+    const state = this.streams.get(streamId);
+    if (state) {
+      if (state.reorderBuffer.flushTimeout) {
+        clearTimeout(state.reorderBuffer.flushTimeout);
+        state.reorderBuffer.flushTimeout = null;
+      }
+      state.reorderBuffer.nextSeq = currentSeq;
+      state.reorderBuffer.pending.clear();
+    }
+  }
+
   /**
-   * Handle incoming pub/sub message
+   * Handle incoming pub/sub message with reordering support for Redis Cluster
    */
   private handleMessage(channel: string, message: string): void {
-    // Extract streamId from channel name: stream:{streamId}:events
-    // Use regex to extract the hash tag content
     const match = channel.match(/^stream:\{([^}]+)\}:events$/);
     if (!match) {
       return;
@@ -111,38 +168,179 @@ export class RedisEventTransport implements IEventTransport {
     try {
       const parsed = JSON.parse(message) as PubSubMessage;
 
-      for (const [, handlers] of streamState.handlers) {
-        switch (parsed.type) {
-          case EventTypes.CHUNK:
-            handlers.onChunk(parsed.data);
-            break;
-          case EventTypes.DONE:
-            handlers.onDone?.(parsed.data);
-            break;
-          case EventTypes.ERROR:
-            handlers.onError?.(parsed.error ?? 'Unknown error');
-            break;
-          case EventTypes.ABORT:
-            // Abort is handled at stream level, not per-handler
-            break;
-        }
-      }
-
-      // Handle abort signals at stream level (not per-handler)
-      if (parsed.type === EventTypes.ABORT) {
-        for (const callback of streamState.abortCallbacks) {
-          try {
-            callback();
-          } catch (err) {
-            logger.error(`[RedisEventTransport] Error in abort callback:`, err);
-          }
-        }
+      if (parsed.type === EventTypes.CHUNK && parsed.seq != null) {
+        this.handleOrderedChunk(streamId, streamState, parsed);
+      } else if (
+        (parsed.type === EventTypes.DONE || parsed.type === EventTypes.ERROR) &&
+        parsed.seq != null
+      ) {
+        this.handleTerminalEvent(streamId, streamState, parsed);
+      } else {
+        this.deliverMessage(streamState, parsed);
       }
     } catch (err) {
       logger.error(`[RedisEventTransport] Failed to parse message:`, err);
     }
   }
 
+  /**
+   * Handle terminal events (done/error) with sequence-based ordering.
+   * Buffers the terminal event and delivers after all preceding chunks arrive.
+   */
+  private handleTerminalEvent(
+    streamId: string,
+    streamState: StreamSubscribers,
+    message: PubSubMessage,
+  ): void {
+    const buffer = streamState.reorderBuffer;
+    const seq = message.seq!;
+
+    if (seq < buffer.nextSeq) {
+      logger.debug(
+        `[RedisEventTransport] Dropping duplicate terminal event for stream ${streamId}: seq=${seq}, expected=${buffer.nextSeq}`,
+      );
+      return;
+    }
+
+    if (seq === buffer.nextSeq) {
+      this.deliverMessage(streamState, message);
+      buffer.nextSeq++;
+      this.flushPendingMessages(streamId, streamState);
+    } else {
+      buffer.pending.set(seq, message);
+      this.scheduleFlushTimeout(streamId, streamState);
+    }
+  }
+
+  /**
+   * Handle chunk messages with sequence-based reordering.
+   * Buffers out-of-order messages and delivers them in sequence.
+   */
+  private handleOrderedChunk(
+    streamId: string,
+    streamState: StreamSubscribers,
+    message: PubSubMessage,
+  ): void {
+    const buffer = streamState.reorderBuffer;
+    const seq = message.seq!;
+
+    if (seq === buffer.nextSeq) {
+      this.deliverMessage(streamState, message);
+      buffer.nextSeq++;
+
+      this.flushPendingMessages(streamId, streamState);
+    } else if (seq > buffer.nextSeq) {
+      buffer.pending.set(seq, message);
+
+      if (buffer.pending.size >= MAX_BUFFER_SIZE) {
+        logger.warn(`[RedisEventTransport] Buffer overflow for stream ${streamId}, force-flushing`);
+        this.forceFlushBuffer(streamId, streamState);
+      } else {
+        this.scheduleFlushTimeout(streamId, streamState);
+      }
+    } else {
+      logger.debug(
+        `[RedisEventTransport] Dropping duplicate/old message for stream ${streamId}: seq=${seq}, expected=${buffer.nextSeq}`,
+      );
+    }
+  }
+
+  /** Deliver consecutive pending messages */
+  private flushPendingMessages(streamId: string, streamState: StreamSubscribers): void {
+    const buffer = streamState.reorderBuffer;
+
+    while (buffer.pending.has(buffer.nextSeq)) {
+      const message = buffer.pending.get(buffer.nextSeq)!;
+      buffer.pending.delete(buffer.nextSeq);
+      this.deliverMessage(streamState, message);
+      buffer.nextSeq++;
+    }
+
+    if (buffer.pending.size === 0 && buffer.flushTimeout) {
+      clearTimeout(buffer.flushTimeout);
+      buffer.flushTimeout = null;
+    }
+  }
+
+  /** Force-flush all pending messages in order (used on timeout or overflow) */
+  private forceFlushBuffer(streamId: string, streamState: StreamSubscribers): void {
+    const buffer = streamState.reorderBuffer;
+
+    if (buffer.flushTimeout) {
+      clearTimeout(buffer.flushTimeout);
+      buffer.flushTimeout = null;
+    }
+
+    if (buffer.pending.size === 0) {
+      return;
+    }
+
+    const sortedSeqs = [...buffer.pending.keys()].sort((a, b) => a - b);
+    const skipped = sortedSeqs[0] - buffer.nextSeq;
+
+    if (skipped > 0) {
+      logger.warn(
+        `[RedisEventTransport] Stream ${streamId}: skipping ${skipped} missing messages (seq ${buffer.nextSeq}-${sortedSeqs[0] - 1})`,
+      );
+    }
+
+    for (const seq of sortedSeqs) {
+      const message = buffer.pending.get(seq)!;
+      buffer.pending.delete(seq);
+      this.deliverMessage(streamState, message);
+    }
+
+    buffer.nextSeq = sortedSeqs[sortedSeqs.length - 1] + 1;
+  }
+
+  /** Schedule a timeout to force-flush if gaps aren't filled */
+  private scheduleFlushTimeout(streamId: string, streamState: StreamSubscribers): void {
+    const buffer = streamState.reorderBuffer;
+
+    if (buffer.flushTimeout) {
+      return;
+    }
+
+    buffer.flushTimeout = setTimeout(() => {
+      buffer.flushTimeout = null;
+      if (buffer.pending.size > 0) {
+        logger.warn(
+          `[RedisEventTransport] Stream ${streamId}: timeout waiting for seq ${buffer.nextSeq}, force-flushing ${buffer.pending.size} messages`,
+        );
+        this.forceFlushBuffer(streamId, streamState);
+      }
+    }, REORDER_TIMEOUT_MS);
+  }
+
+  /** Deliver a message to all handlers */
+  private deliverMessage(streamState: StreamSubscribers, message: PubSubMessage): void {
+    for (const [, handlers] of streamState.handlers) {
+      switch (message.type) {
+        case EventTypes.CHUNK:
+          handlers.onChunk(message.data);
+          break;
+        case EventTypes.DONE:
+          handlers.onDone?.(message.data);
+          break;
+        case EventTypes.ERROR:
+          handlers.onError?.(message.error ?? 'Unknown error');
+          break;
+        case EventTypes.ABORT:
+          break;
+      }
+    }
+
+    if (message.type === EventTypes.ABORT) {
+      for (const callback of streamState.abortCallbacks) {
+        try {
+          callback();
+        } catch (err) {
+          logger.error(`[RedisEventTransport] Error in abort callback:`, err);
+        }
+      }
+    }
+  }
+
   /**
    * Subscribe to events for a stream.
    *
@@ -156,7 +354,7 @@ export class RedisEventTransport implements IEventTransport {
       onDone?: (event: unknown) => void;
       onError?: (error: string) => void;
     },
-  ): { unsubscribe: () => void } {
+  ): { unsubscribe: () => void; ready?: Promise<void> } {
     const channel = CHANNELS.events(streamId);
     const subscriberId = `sub_${++this.subscriberIdCounter}`;
 
@@ -167,6 +365,11 @@ export class RedisEventTransport implements IEventTransport {
         handlers: new Map(),
         allSubscribersLeftCallbacks: [],
         abortCallbacks: [],
+        reorderBuffer: {
+          nextSeq: 0,
+          pending: new Map(),
+          flushTimeout: null,
+        },
       });
     }
 
@@ -174,16 +377,23 @@ export class RedisEventTransport implements IEventTransport {
     streamState.count++;
     streamState.handlers.set(subscriberId, handlers);
 
-    // Subscribe to Redis channel if this is first subscriber
-    if (!this.subscribedChannels.has(channel)) {
-      this.subscribedChannels.add(channel);
-      this.subscriber.subscribe(channel).catch((err) => {
-        logger.error(`[RedisEventTransport] Failed to subscribe to ${channel}:`, err);
-      });
+    let readyPromise = this.channelSubscriptions.get(channel);
+
+    if (!readyPromise) {
+      readyPromise = this.subscriber
+        .subscribe(channel)
+        .then(() => {
+          logger.debug(`[RedisEventTransport] Subscription active for channel ${channel}`);
+        })
+        .catch((err) => {
+          this.channelSubscriptions.delete(channel);
+          logger.error(`[RedisEventTransport] Failed to subscribe to ${channel}:`, err);
+        });
+      this.channelSubscriptions.set(channel, readyPromise);
     }
 
-    // Return unsubscribe function
     return {
+      ready: readyPromise,
       unsubscribe: () => {
         const state = this.streams.get(streamId);
         if (!state) {
@@ -195,10 +405,17 @@ export class RedisEventTransport implements IEventTransport {
 
         // If last subscriber left, unsubscribe from Redis and notify
         if (state.count === 0) {
+          // Clear any pending flush timeout and buffered messages
+          if (state.reorderBuffer.flushTimeout) {
+            clearTimeout(state.reorderBuffer.flushTimeout);
+            state.reorderBuffer.flushTimeout = null;
+          }
+          state.reorderBuffer.pending.clear();
+
           this.subscriber.unsubscribe(channel).catch((err) => {
             logger.error(`[RedisEventTransport] Failed to unsubscribe from ${channel}:`, err);
           });
-          this.subscribedChannels.delete(channel);
+          this.channelSubscriptions.delete(channel);
 
           // Call all-subscribers-left callbacks
           for (const callback of state.allSubscribersLeftCallbacks) {
@@ -208,8 +425,15 @@ export class RedisEventTransport implements IEventTransport {
               logger.error(`[RedisEventTransport] Error in allSubscribersLeft callback:`, err);
             }
           }
-
-          this.streams.delete(streamId);
+          /**
+           *  Preserve stream state (callbacks, abort handlers) for reconnection.
+           *  Previously this deleted the entire state, which lost the
+           *  allSubscribersLeftCallbacks and abortCallbacks registered by
+           *  GenerationJobManager.createJob(). On the next subscribe() call,
+           *  fresh state was created without those callbacks, causing
+           *  hasSubscriber to never reset and syncReorderBuffer to be skipped.
+           *  State is fully cleaned up by cleanup() when the job completes.
+           */
         }
       },
     };
@@ -217,38 +441,52 @@ export class RedisEventTransport implements IEventTransport {
 
   /**
    * Publish a chunk event to all subscribers across all instances.
+   * Includes sequence number for ordered delivery in Redis Cluster mode.
    */
-  emitChunk(streamId: string, event: unknown): void {
+  async emitChunk(streamId: string, event: unknown): Promise<void> {
     const channel = CHANNELS.events(streamId);
-    const message: PubSubMessage = { type: EventTypes.CHUNK, data: event };
+    const seq = this.getNextSequence(streamId);
+    const message: PubSubMessage = { type: EventTypes.CHUNK, seq, data: event };
 
-    this.publisher.publish(channel, JSON.stringify(message)).catch((err) => {
+    try {
+      await this.publisher.publish(channel, JSON.stringify(message));
+    } catch (err) {
       logger.error(`[RedisEventTransport] Failed to publish chunk:`, err);
-    });
+    }
   }
 
   /**
    * Publish a done event to all subscribers.
+   * Includes sequence number to ensure delivery after all chunks.
    */
-  emitDone(streamId: string, event: unknown): void {
+  async emitDone(streamId: string, event: unknown): Promise<void> {
     const channel = CHANNELS.events(streamId);
-    const message: PubSubMessage = { type: EventTypes.DONE, data: event };
+    const seq = this.getNextSequence(streamId);
+    const message: PubSubMessage = { type: EventTypes.DONE, seq, data: event };
 
-    this.publisher.publish(channel, JSON.stringify(message)).catch((err) => {
+    try {
+      await this.publisher.publish(channel, JSON.stringify(message));
+    } catch (err) {
       logger.error(`[RedisEventTransport] Failed to publish done:`, err);
-    });
+      throw err;
+    }
   }
 
   /**
    * Publish an error event to all subscribers.
+   * Includes sequence number to ensure delivery after all chunks.
    */
-  emitError(streamId: string, error: string): void {
+  async emitError(streamId: string, error: string): Promise<void> {
     const channel = CHANNELS.events(streamId);
-    const message: PubSubMessage = { type: EventTypes.ERROR, error };
+    const seq = this.getNextSequence(streamId);
+    const message: PubSubMessage = { type: EventTypes.ERROR, seq, error };
 
-    this.publisher.publish(channel, JSON.stringify(message)).catch((err) => {
+    try {
+      await this.publisher.publish(channel, JSON.stringify(message));
+    } catch (err) {
       logger.error(`[RedisEventTransport] Failed to publish error:`, err);
-    });
+      throw err;
+    }
   }
 
   /**
@@ -282,6 +520,11 @@ export class RedisEventTransport implements IEventTransport {
         handlers: new Map(),
         allSubscribersLeftCallbacks: [callback],
         abortCallbacks: [],
+        reorderBuffer: {
+          nextSeq: 0,
+          pending: new Map(),
+          flushTimeout: null,
+        },
       });
     }
   }
@@ -317,18 +560,26 @@ export class RedisEventTransport implements IEventTransport {
         handlers: new Map(),
         allSubscribersLeftCallbacks: [],
         abortCallbacks: [],
+        reorderBuffer: {
+          nextSeq: 0,
+          pending: new Map(),
+          flushTimeout: null,
+        },
       };
       this.streams.set(streamId, state);
     }
 
     state.abortCallbacks.push(callback);
 
-    // Subscribe to Redis channel if not already subscribed
-    if (!this.subscribedChannels.has(channel)) {
-      this.subscribedChannels.add(channel);
-      this.subscriber.subscribe(channel).catch((err) => {
-        logger.error(`[RedisEventTransport] Failed to subscribe to ${channel}:`, err);
-      });
+    if (!this.channelSubscriptions.has(channel)) {
+      const ready = this.subscriber
+        .subscribe(channel)
+        .then(() => {})
+        .catch((err) => {
+          this.channelSubscriptions.delete(channel);
+          logger.error(`[RedisEventTransport] Failed to subscribe to ${channel}:`, err);
+        });
+      this.channelSubscriptions.set(channel, ready);
     }
   }
 
@@ -347,18 +598,26 @@ export class RedisEventTransport implements IEventTransport {
     const state = this.streams.get(streamId);
 
     if (state) {
+      // Clear flush timeout
+      if (state.reorderBuffer.flushTimeout) {
+        clearTimeout(state.reorderBuffer.flushTimeout);
+        state.reorderBuffer.flushTimeout = null;
+      }
       // Clear all handlers and callbacks
       state.handlers.clear();
       state.allSubscribersLeftCallbacks = [];
       state.abortCallbacks = [];
+      state.reorderBuffer.pending.clear();
     }
 
-    // Unsubscribe from Redis channel
-    if (this.subscribedChannels.has(channel)) {
+    // Reset sequence counter for this stream
+    this.resetSequence(streamId);
+
+    if (this.channelSubscriptions.has(channel)) {
       this.subscriber.unsubscribe(channel).catch((err) => {
         logger.error(`[RedisEventTransport] Failed to cleanup ${channel}:`, err);
       });
-      this.subscribedChannels.delete(channel);
+      this.channelSubscriptions.delete(channel);
     }
 
     this.streams.delete(streamId);
@@ -368,17 +627,29 @@ export class RedisEventTransport implements IEventTransport {
    * Destroy all resources.
    */
   destroy(): void {
-    // Unsubscribe from all channels
-    for (const channel of this.subscribedChannels) {
-      this.subscriber.unsubscribe(channel).catch(() => {
-        // Ignore errors during shutdown
-      });
+    // Clear all flush timeouts and buffered messages
+    for (const [, state] of this.streams) {
+      if (state.reorderBuffer.flushTimeout) {
+        clearTimeout(state.reorderBuffer.flushTimeout);
+        state.reorderBuffer.flushTimeout = null;
+      }
+      state.reorderBuffer.pending.clear();
     }
 
-    this.subscribedChannels.clear();
-    this.streams.clear();
+    for (const channel of this.channelSubscriptions.keys()) {
+      this.subscriber.unsubscribe(channel).catch(() => {});
+    }
+
+    this.channelSubscriptions.clear();
+    this.streams.clear();
+    this.sequenceCounters.clear();
+
+    try {
+      this.subscriber.disconnect();
+    } catch {
+      /* ignore */
+    }
 
-    // Note: Don't close Redis connections - they may be shared
     logger.info('[RedisEventTransport] Destroyed');
   }
 }
diff --git a/packages/api/src/stream/implementations/RedisJobStore.ts b/packages/api/src/stream/implementations/RedisJobStore.ts
index 421fa30f2c..727fe066eb 100644
--- a/packages/api/src/stream/implementations/RedisJobStore.ts
+++ b/packages/api/src/stream/implementations/RedisJobStore.ts
@@ -1,9 +1,14 @@
 import { logger } from '@librechat/data-schemas';
 import { createContentAggregator } from '@librechat/agents';
-import type { IJobStore, SerializableJobData, JobStatus } from '~/stream/interfaces/IJobStore';
 import type { StandardGraph } from '@librechat/agents';
 import type { Agents } from 'librechat-data-provider';
 import type { Redis, Cluster } from 'ioredis';
+import type {
+  SerializableJobData,
+  UsageMetadata,
+  IJobStore,
+  JobStatus,
+} from '~/stream/interfaces/IJobStore';
 
 /**
  * Key prefixes for Redis storage.
@@ -90,6 +95,13 @@ export class RedisJobStore implements IJobStore {
    */
   private localGraphCache = new Map<string, WeakRef<StandardGraph>>();
 
+  /**
+   * Local cache for collectedUsage arrays.
+   * Generation happens on a single instance, so collectedUsage is only available locally.
+   * For cross-replica abort, the abort handler falls back to text-based token counting.
+   */
+  private localCollectedUsageCache = new Map<string, UsageMetadata[]>();
+
   /** Cleanup interval in ms (1 minute) */
   private cleanupIntervalMs = 60000;
 
@@ -144,13 +156,13 @@ export class RedisJobStore implements IJobStore {
     // For cluster mode, we can't pipeline keys on different slots
     // The job key uses hash tag {streamId}, runningJobs and userJobs are on different slots
     if (this.isCluster) {
-      await this.redis.hmset(key, this.serializeJob(job));
+      await this.redis.hset(key, this.serializeJob(job));
       await this.redis.expire(key, this.ttl.running);
       await this.redis.sadd(KEYS.runningJobs, streamId);
       await this.redis.sadd(userJobsKey, streamId);
     } else {
       const pipeline = this.redis.pipeline();
-      pipeline.hmset(key, this.serializeJob(job));
+      pipeline.hset(key, this.serializeJob(job));
       pipeline.expire(key, this.ttl.running);
       pipeline.sadd(KEYS.runningJobs, streamId);
       pipeline.sadd(userJobsKey, streamId);
@@ -171,17 +183,23 @@ export class RedisJobStore implements IJobStore {
 
   async updateJob(streamId: string, updates: Partial<SerializableJobData>): Promise<void> {
     const key = KEYS.job(streamId);
-    const exists = await this.redis.exists(key);
-    if (!exists) {
-      return;
-    }
 
     const serialized = this.serializeJob(updates as SerializableJobData);
     if (Object.keys(serialized).length === 0) {
       return;
     }
 
-    await this.redis.hmset(key, serialized);
+    const fields = Object.entries(serialized).flat();
+    const updated = await this.redis.eval(
+      'if redis.call("EXISTS", KEYS[1]) == 1 then redis.call("HSET", KEYS[1], unpack(ARGV)) return 1 else return 0 end',
+      1,
+      key,
+      ...fields,
+    );
+
+    if (updated === 0) {
+      return;
+    }
 
     // If status changed to complete/error/aborted, update TTL and remove from running set
     // Note: userJobs cleanup is handled lazily via self-healing in getActiveJobIdsByUser
@@ -227,6 +245,7 @@ export class RedisJobStore implements IJobStore {
   async deleteJob(streamId: string): Promise<void> {
     // Clear local caches
     this.localGraphCache.delete(streamId);
+    this.localCollectedUsageCache.delete(streamId);
 
     // Note: userJobs cleanup is handled lazily via self-healing in getActiveJobIdsByUser
     // In cluster mode, separate runningJobs (global) from stream-specific keys (same slot)
@@ -283,30 +302,46 @@ export class RedisJobStore implements IJobStore {
       }
     }
 
-    for (const streamId of streamIds) {
-      const job = await this.getJob(streamId);
+    // Process in batches of 50 to avoid sequential per-job round-trips
+    const BATCH_SIZE = 50;
+    for (let i = 0; i < streamIds.length; i += BATCH_SIZE) {
+      const batch = streamIds.slice(i, i + BATCH_SIZE);
+      const results = await Promise.allSettled(
+        batch.map(async (streamId) => {
+          const job = await this.getJob(streamId);
 
-      // Job no longer exists (TTL expired) - remove from set
-      if (!job) {
-        await this.redis.srem(KEYS.runningJobs, streamId);
-        this.localGraphCache.delete(streamId);
-        cleaned++;
-        continue;
-      }
+          // Job no longer exists (TTL expired) - remove from set
+          if (!job) {
+            await this.redis.srem(KEYS.runningJobs, streamId);
+            this.localGraphCache.delete(streamId);
+            this.localCollectedUsageCache.delete(streamId);
+            return 1;
+          }
 
-      // Job completed but still in running set (shouldn't happen, but handle it)
-      if (job.status !== 'running') {
-        await this.redis.srem(KEYS.runningJobs, streamId);
-        this.localGraphCache.delete(streamId);
-        cleaned++;
-        continue;
-      }
+          // Job completed but still in running set (shouldn't happen, but handle it)
+          if (job.status !== 'running') {
+            await this.redis.srem(KEYS.runningJobs, streamId);
+            this.localGraphCache.delete(streamId);
+            this.localCollectedUsageCache.delete(streamId);
+            return 1;
+          }
 
-      // Stale running job (failsafe - running for > configured TTL)
-      if (now - job.createdAt > this.ttl.running * 1000) {
-        logger.warn(`[RedisJobStore] Cleaning up stale job: ${streamId}`);
-        await this.deleteJob(streamId);
-        cleaned++;
+          // Stale running job (failsafe - running for > configured TTL)
+          if (now - job.createdAt > this.ttl.running * 1000) {
+            logger.warn(`[RedisJobStore] Cleaning up stale job: ${streamId}`);
+            await this.deleteJob(streamId);
+            return 1;
+          }
+
+          return 0;
+        }),
+      );
+      for (const result of results) {
+        if (result.status === 'fulfilled') {
+          cleaned += result.value;
+        } else {
+          logger.warn(`[RedisJobStore] Cleanup failed for a job:`, result.reason);
+        }
       }
     }
 
@@ -382,6 +417,7 @@ export class RedisJobStore implements IJobStore {
     }
     // Clear local caches
     this.localGraphCache.clear();
+    this.localCollectedUsageCache.clear();
     // Don't close the Redis connection - it's shared
     logger.info('[RedisJobStore] Destroyed');
   }
@@ -406,11 +442,28 @@ export class RedisJobStore implements IJobStore {
    * No-op for Redis - content parts are reconstructed from chunks.
    * Metadata (agentId, groupId) is embedded directly on content parts by the agent runtime.
    */
-  setContentParts(_streamId: string, _contentParts: Agents.MessageContentComplex[]): void {
+  setContentParts(): void {
     // Content parts are reconstructed from chunks during getContentParts
     // No separate storage needed
   }
 
+  /**
+   * Store collectedUsage reference in local cache.
+   * This is used for abort handling to spend tokens for all models.
+   * Note: Only available on the generating instance; cross-replica abort uses fallback.
+   */
+  setCollectedUsage(streamId: string, collectedUsage: UsageMetadata[]): void {
+    this.localCollectedUsageCache.set(streamId, collectedUsage);
+  }
+
+  /**
+   * Get collected usage for a job.
+   * Only available if this is the generating instance.
+   */
+  getCollectedUsage(streamId: string): UsageMetadata[] {
+    return this.localCollectedUsageCache.get(streamId) ?? [];
+  }
+
   /**
    * Get aggregated content - tries local cache first, falls back to Redis reconstruction.
    *
@@ -528,6 +581,7 @@ export class RedisJobStore implements IJobStore {
   clearContentState(streamId: string): void {
     // Clear local caches immediately
     this.localGraphCache.delete(streamId);
+    this.localCollectedUsageCache.delete(streamId);
 
     // Fire and forget - async cleanup for Redis
     this.clearContentStateAsync(streamId).catch((err) => {
@@ -552,16 +606,14 @@ export class RedisJobStore implements IJobStore {
    */
   async appendChunk(streamId: string, event: unknown): Promise<void> {
     const key = KEYS.chunks(streamId);
-    const added = await this.redis.xadd(key, '*', 'event', JSON.stringify(event));
-
-    // Set TTL on first chunk (when stream is created)
-    // Subsequent chunks inherit the stream's TTL
-    if (added) {
-      const len = await this.redis.xlen(key);
-      if (len === 1) {
-        await this.redis.expire(key, this.ttl.running);
-      }
-    }
+    // Pipeline XADD + EXPIRE in a single round-trip.
+    // EXPIRE is O(1) and idempotent — refreshing TTL on every chunk is better than
+    // only setting it once, since the original approach could let the TTL expire
+    // during long-running streams.
+    const pipeline = this.redis.pipeline();
+    pipeline.xadd(key, '*', 'event', JSON.stringify(event));
+    pipeline.expire(key, this.ttl.running);
+    await pipeline.exec();
   }
 
   /**
diff --git a/packages/api/src/stream/index.ts b/packages/api/src/stream/index.ts
index 4e9bab324c..74c13a2bf0 100644
--- a/packages/api/src/stream/index.ts
+++ b/packages/api/src/stream/index.ts
@@ -5,11 +5,12 @@ export {
 } from './GenerationJobManager';
 
 export type {
-  AbortResult,
   SerializableJobData,
+  IEventTransport,
+  UsageMetadata,
+  AbortResult,
   JobStatus,
   IJobStore,
-  IEventTransport,
 } from './interfaces/IJobStore';
 
 export { createStreamServices } from './createStreamServices';
diff --git a/packages/api/src/stream/interfaces/IJobStore.ts b/packages/api/src/stream/interfaces/IJobStore.ts
index 14611a7fad..5486b941eb 100644
--- a/packages/api/src/stream/interfaces/IJobStore.ts
+++ b/packages/api/src/stream/interfaces/IJobStore.ts
@@ -45,6 +45,54 @@ export interface SerializableJobData {
   promptTokens?: number;
 }
 
+/**
+ * Usage metadata for token spending across different LLM providers.
+ *
+ * This interface supports two mutually exclusive cache token formats:
+ *
+ * **OpenAI format** (GPT-4, o1, etc.):
+ * - Uses `input_token_details.cache_creation` and `input_token_details.cache_read`
+ * - Cache tokens are nested under the `input_token_details` object
+ *
+ * **Anthropic format** (Claude models):
+ * - Uses `cache_creation_input_tokens` and `cache_read_input_tokens`
+ * - Cache tokens are top-level properties
+ *
+ * When processing usage data, check both formats:
+ * ```typescript
+ * const cacheCreation = usage.input_token_details?.cache_creation
+ *   || usage.cache_creation_input_tokens || 0;
+ * ```
+ */
+export interface UsageMetadata {
+  /** Total input tokens (prompt tokens) */
+  input_tokens?: number;
+  /** Total output tokens (completion tokens) */
+  output_tokens?: number;
+  /** Model identifier that generated this usage */
+  model?: string;
+  /**
+   * OpenAI-style cache token details.
+   * Present for OpenAI models (GPT-4, o1, etc.)
+   */
+  input_token_details?: {
+    /** Tokens written to cache */
+    cache_creation?: number;
+    /** Tokens read from cache */
+    cache_read?: number;
+  };
+  /**
+   * Anthropic-style cache creation tokens.
+   * Present for Claude models. Mutually exclusive with input_token_details.
+   */
+  cache_creation_input_tokens?: number;
+  /**
+   * Anthropic-style cache read tokens.
+   * Present for Claude models. Mutually exclusive with input_token_details.
+   */
+  cache_read_input_tokens?: number;
+}
+
 /**
  * Result returned from aborting a job - contains all data needed
  * for token spending and message saving without storing callbacks
@@ -58,6 +106,10 @@ export interface AbortResult {
   content: Agents.MessageContentComplex[];
   /** Final event to send to client */
   finalEvent: unknown;
+  /** Concatenated text from all content parts for token counting fallback */
+  text: string;
+  /** Collected usage metadata from all models for token spending */
+  collectedUsage: UsageMetadata[];
 }
 
 /**
@@ -210,6 +262,23 @@ export interface IJobStore {
    * @param runSteps - Run steps to save
    */
   saveRunSteps?(streamId: string, runSteps: Agents.RunStep[]): Promise<void>;
+
+  /**
+   * Set collected usage reference for a job.
+   * This array accumulates token usage from all models during generation.
+   *
+   * @param streamId - The stream identifier
+   * @param collectedUsage - Array of usage metadata from all models
+   */
+  setCollectedUsage(streamId: string, collectedUsage: UsageMetadata[]): void;
+
+  /**
+   * Get collected usage for a job.
+   *
+   * @param streamId - The stream identifier
+   * @returns Array of usage metadata or empty array
+   */
+  getCollectedUsage(streamId: string): UsageMetadata[];
 }
 
 /**
@@ -217,7 +286,7 @@ export interface IJobStore {
  * Implementations can use EventEmitter, Redis Pub/Sub, etc.
  */
 export interface IEventTransport {
-  /** Subscribe to events for a stream */
+  /** Subscribe to events for a stream. `ready` resolves once the transport can receive messages. */
   subscribe(
     streamId: string,
     handlers: {
@@ -225,16 +294,16 @@ export interface IEventTransport {
       onDone?: (event: unknown) => void;
       onError?: (error: string) => void;
     },
-  ): { unsubscribe: () => void };
+  ): { unsubscribe: () => void; ready?: Promise<void> };
 
-  /** Publish a chunk event */
-  emitChunk(streamId: string, event: unknown): void;
+  /** Publish a chunk event - returns Promise in Redis mode for ordered delivery */
+  emitChunk(streamId: string, event: unknown): void | Promise<void>;
 
-  /** Publish a done event */
-  emitDone(streamId: string, event: unknown): void;
+  /** Publish a done event - returns Promise in Redis mode for ordered delivery */
+  emitDone(streamId: string, event: unknown): void | Promise<void>;
 
-  /** Publish an error event */
-  emitError(streamId: string, error: string): void;
+  /** Publish an error event - returns Promise in Redis mode for ordered delivery */
+  emitError(streamId: string, error: string): void | Promise<void>;
 
   /**
    * Publish an abort signal to all replicas (Redis mode).
@@ -260,6 +329,12 @@ export interface IEventTransport {
   /** Listen for all subscribers leaving */
   onAllSubscribersLeft(streamId: string, callback: () => void): void;
 
+  /** Reset publish sequence counter for a stream (used during full stream cleanup) */
+  resetSequence?(streamId: string): void;
+
+  /** Advance subscriber reorder buffer to match publisher sequence (cross-replica safe: doesn't reset publisher counter) */
+  syncReorderBuffer?(streamId: string): void;
+
   /** Cleanup transport resources for a specific stream */
   cleanup(streamId: string): void;
 
diff --git a/packages/api/src/tools/classification.spec.ts b/packages/api/src/tools/classification.spec.ts
new file mode 100644
index 0000000000..2d6fe222ec
--- /dev/null
+++ b/packages/api/src/tools/classification.spec.ts
@@ -0,0 +1,431 @@
+import type { AgentToolOptions } from 'librechat-data-provider';
+import type { GenericTool } from '@librechat/agents';
+import type { LCToolRegistry } from './classification';
+import {
+  buildToolRegistryFromAgentOptions,
+  agentHasProgrammaticTools,
+  buildToolClassification,
+  getServerNameFromTool,
+  agentHasDeferredTools,
+} from './classification';
+
+describe('classification.ts', () => {
+  describe('getServerNameFromTool', () => {
+    it('should extract server name from MCP tool name', () => {
+      const result = getServerNameFromTool('list_files_mcp_Google-Workspace');
+      expect(result).toBe('Google-Workspace');
+    });
+
+    it('should return undefined for non-MCP tool', () => {
+      const result = getServerNameFromTool('simple_tool');
+      expect(result).toBeUndefined();
+    });
+
+    it('should handle multiple delimiters', () => {
+      const result = getServerNameFromTool('some_tool_mcp_Server_Name');
+      expect(result).toBe('Server_Name');
+    });
+  });
+
+  describe('buildToolRegistryFromAgentOptions', () => {
+    it('should use agent tool options for defer_loading', () => {
+      const tools = [
+        { name: 'tool1', description: 'Tool 1' },
+        { name: 'tool2', description: 'Tool 2' },
+      ];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: false },
+      };
+
+      const registry = buildToolRegistryFromAgentOptions(tools, agentToolOptions);
+
+      expect(registry.get('tool1')?.defer_loading).toBe(true);
+      expect(registry.get('tool2')?.defer_loading).toBe(false);
+    });
+
+    it('should default defer_loading to false when not specified', () => {
+      const tools = [{ name: 'tool1', description: 'Tool 1' }];
+
+      const agentToolOptions: AgentToolOptions = {};
+
+      const registry = buildToolRegistryFromAgentOptions(tools, agentToolOptions);
+
+      expect(registry.get('tool1')?.defer_loading).toBe(false);
+    });
+
+    it('should use agent allowed_callers when specified', () => {
+      const tools = [{ name: 'tool1', description: 'Tool 1' }];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { allowed_callers: ['code_execution'] },
+      };
+
+      const registry = buildToolRegistryFromAgentOptions(tools, agentToolOptions);
+
+      expect(registry.get('tool1')?.allowed_callers).toEqual(['code_execution']);
+    });
+
+    it('should default allowed_callers to direct when not specified', () => {
+      const tools = [{ name: 'tool1', description: 'Tool 1' }];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+      };
+
+      const registry = buildToolRegistryFromAgentOptions(tools, agentToolOptions);
+
+      expect(registry.get('tool1')?.allowed_callers).toEqual(['direct']);
+    });
+  });
+
+  describe('agentHasDeferredTools', () => {
+    it('should return true when registry has deferred tools', () => {
+      const registry: LCToolRegistry = new Map([
+        ['tool1', { name: 'tool1', allowed_callers: ['direct'], defer_loading: true }],
+        ['tool2', { name: 'tool2', allowed_callers: ['direct'], defer_loading: false }],
+      ]);
+
+      expect(agentHasDeferredTools(registry)).toBe(true);
+    });
+
+    it('should return false when no tools are deferred', () => {
+      const registry: LCToolRegistry = new Map([
+        ['tool1', { name: 'tool1', allowed_callers: ['direct'], defer_loading: false }],
+        ['tool2', { name: 'tool2', allowed_callers: ['direct'], defer_loading: false }],
+      ]);
+
+      expect(agentHasDeferredTools(registry)).toBe(false);
+    });
+
+    it('should return false for empty registry', () => {
+      const registry: LCToolRegistry = new Map();
+      expect(agentHasDeferredTools(registry)).toBe(false);
+    });
+  });
+
+  describe('agentHasProgrammaticTools', () => {
+    it('should return true when registry has programmatic tools', () => {
+      const registry: LCToolRegistry = new Map([
+        ['tool1', { name: 'tool1', allowed_callers: ['code_execution'], defer_loading: false }],
+      ]);
+
+      expect(agentHasProgrammaticTools(registry)).toBe(true);
+    });
+
+    it('should return true for dual context tools', () => {
+      const registry: LCToolRegistry = new Map([
+        [
+          'tool1',
+          { name: 'tool1', allowed_callers: ['direct', 'code_execution'], defer_loading: false },
+        ],
+      ]);
+
+      expect(agentHasProgrammaticTools(registry)).toBe(true);
+    });
+
+    it('should return false when no programmatic tools', () => {
+      const registry: LCToolRegistry = new Map([
+        ['tool1', { name: 'tool1', allowed_callers: ['direct'], defer_loading: false }],
+      ]);
+
+      expect(agentHasProgrammaticTools(registry)).toBe(false);
+    });
+  });
+
+  describe('buildToolClassification with deferredToolsEnabled', () => {
+    const mockLoadAuthValues = jest.fn().mockResolvedValue({});
+
+    const createMCPTool = (name: string, description?: string) =>
+      ({
+        name,
+        description,
+        mcp: true,
+        mcpJsonSchema: { type: 'object', properties: {} },
+      }) as unknown as GenericTool;
+
+    beforeEach(() => {
+      jest.clearAllMocks();
+    });
+
+    it('should return hasDeferredTools: false when deferredToolsEnabled is false', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1'), createMCPTool('tool2')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: false,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.hasDeferredTools).toBe(false);
+      expect(result.additionalTools.length).toBe(0);
+    });
+
+    it('should clear defer_loading from all tools when deferredToolsEnabled is false', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1'), createMCPTool('tool2')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: false,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.toolRegistry).toBeDefined();
+      expect(result.toolRegistry?.get('tool1')?.defer_loading).toBe(false);
+      expect(result.toolRegistry?.get('tool2')?.defer_loading).toBe(false);
+    });
+
+    it('should preserve defer_loading when deferredToolsEnabled is true', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1'), createMCPTool('tool2')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+        tool2: { defer_loading: false },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.hasDeferredTools).toBe(true);
+      expect(result.toolRegistry?.get('tool1')?.defer_loading).toBe(true);
+      expect(result.toolRegistry?.get('tool2')?.defer_loading).toBe(false);
+    });
+
+    it('should create tool search when deferredToolsEnabled is true and has deferred tools', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.hasDeferredTools).toBe(true);
+      expect(result.additionalTools.some((t) => t.name === 'tool_search')).toBe(true);
+    });
+
+    it('should NOT create tool search when deferredToolsEnabled is false', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: false,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.hasDeferredTools).toBe(false);
+      expect(result.additionalTools.some((t) => t.name === 'tool_search')).toBe(false);
+    });
+
+    it('should default deferredToolsEnabled to true when not specified', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.hasDeferredTools).toBe(true);
+    });
+
+    it('should return early when no MCP tools are present', async () => {
+      const loadedTools: GenericTool[] = [
+        { name: 'regular_tool', mcp: false } as unknown as GenericTool,
+      ];
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        deferredToolsEnabled: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.toolRegistry).toBeUndefined();
+      expect(result.hasDeferredTools).toBe(false);
+      expect(result.additionalTools.length).toBe(0);
+    });
+  });
+
+  describe('buildToolClassification with definitionsOnly', () => {
+    const mockLoadAuthValues = jest.fn().mockResolvedValue({ CODE_API_KEY: 'test-key' });
+
+    const createMCPTool = (name: string, description?: string) =>
+      ({
+        name,
+        description,
+        mcp: true,
+        mcpJsonSchema: { type: 'object', properties: {} },
+      }) as unknown as GenericTool;
+
+    beforeEach(() => {
+      jest.clearAllMocks();
+    });
+
+    it('should NOT create tool instances when definitionsOnly=true', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        definitionsOnly: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.additionalTools.length).toBe(0);
+    });
+
+    it('should still add tool_search definition when definitionsOnly=true and has deferred tools', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        definitionsOnly: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.toolDefinitions.some((d) => d.name === 'tool_search')).toBe(true);
+      expect(result.toolRegistry?.has('tool_search')).toBe(true);
+    });
+
+    it('should still add PTC definition when definitionsOnly=true and has programmatic tools', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { allowed_callers: ['code_execution'] },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        definitionsOnly: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.toolDefinitions.some((d) => d.name === 'run_tools_with_code')).toBe(true);
+      expect(result.toolRegistry?.has('run_tools_with_code')).toBe(true);
+      expect(result.additionalTools.length).toBe(0);
+    });
+
+    it('should NOT call loadAuthValues for PTC when definitionsOnly=true', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { allowed_callers: ['code_execution'] },
+      };
+
+      await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        definitionsOnly: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(mockLoadAuthValues).not.toHaveBeenCalled();
+    });
+
+    it('should call loadAuthValues for PTC when definitionsOnly=false', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { allowed_callers: ['code_execution'] },
+      };
+
+      await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        definitionsOnly: false,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(mockLoadAuthValues).toHaveBeenCalled();
+    });
+
+    it('should create tool instances when definitionsOnly=false (default)', async () => {
+      const loadedTools: GenericTool[] = [createMCPTool('tool1')];
+
+      const agentToolOptions: AgentToolOptions = {
+        tool1: { defer_loading: true },
+      };
+
+      const result = await buildToolClassification({
+        loadedTools,
+        userId: 'user1',
+        agentId: 'agent1',
+        agentToolOptions,
+        deferredToolsEnabled: true,
+        loadAuthValues: mockLoadAuthValues,
+      });
+
+      expect(result.additionalTools.some((t) => t.name === 'tool_search')).toBe(true);
+    });
+  });
+});
diff --git a/packages/api/src/tools/classification.ts b/packages/api/src/tools/classification.ts
new file mode 100644
index 0000000000..2c65076f6f
--- /dev/null
+++ b/packages/api/src/tools/classification.ts
@@ -0,0 +1,388 @@
+/**
+ * @fileoverview Utility functions for building tool registries from agent tool_options.
+ * Tool classification (deferred_tools, allowed_callers) is configured via the agent UI.
+ *
+ * @module packages/api/src/tools/classification
+ */
+
+import { logger } from '@librechat/data-schemas';
+import { Constants } from 'librechat-data-provider';
+import {
+  EnvVar,
+  createToolSearch,
+  ToolSearchToolDefinition,
+  createProgrammaticToolCallingTool,
+  ProgrammaticToolCallingDefinition,
+} from '@librechat/agents';
+import type { AgentToolOptions } from 'librechat-data-provider';
+import type {
+  LCToolRegistry,
+  JsonSchemaType,
+  AllowedCaller,
+  GenericTool,
+  LCTool,
+} from '@librechat/agents';
+
+export type { LCTool, LCToolRegistry, AllowedCaller, JsonSchemaType };
+
+export interface ToolDefinition {
+  name: string;
+  description?: string;
+  parameters?: JsonSchemaType;
+  /** MCP server name extracted from tool name */
+  serverName?: string;
+}
+
+/**
+ * Extracts the MCP server name from a tool name.
+ * Tool names follow the pattern: toolName_mcp_ServerName
+ * @param toolName - The full tool name
+ * @returns The server name or undefined if not an MCP tool
+ */
+export function getServerNameFromTool(toolName: string): string | undefined {
+  const parts = toolName.split(Constants.mcp_delimiter);
+  if (parts.length >= 2) {
+    return parts[parts.length - 1];
+  }
+  return undefined;
+}
+
+/**
+ * Builds a tool registry from agent-level tool_options.
+ *
+ * @param tools - Array of tool definitions
+ * @param agentToolOptions - Per-tool configuration from the agent
+ * @returns Map of tool name to tool definition with classification
+ */
+export function buildToolRegistryFromAgentOptions(
+  tools: ToolDefinition[],
+  agentToolOptions: AgentToolOptions,
+): LCToolRegistry {
+  const registry: LCToolRegistry = new Map();
+
+  for (const tool of tools) {
+    const { name, description, parameters } = tool;
+    const agentOptions = agentToolOptions[name];
+
+    const allowed_callers: AllowedCaller[] =
+      agentOptions?.allowed_callers && agentOptions.allowed_callers.length > 0
+        ? agentOptions.allowed_callers
+        : ['direct'];
+
+    const defer_loading = agentOptions?.defer_loading === true;
+
+    const toolDef: LCTool = {
+      name,
+      allowed_callers,
+      defer_loading,
+      toolType: 'mcp',
+    };
+
+    if (description) {
+      toolDef.description = description;
+    }
+    if (parameters) {
+      toolDef.parameters = parameters;
+    }
+    if (tool.serverName) {
+      toolDef.serverName = tool.serverName;
+    }
+
+    registry.set(name, toolDef);
+  }
+
+  return registry;
+}
+
+interface MCPToolInstance {
+  name: string;
+  description?: string;
+  mcp?: boolean;
+  /** Original JSON schema attached at MCP tool creation time */
+  mcpJsonSchema?: JsonSchemaType;
+}
+
+/**
+ * Extracts MCP tool definition from a loaded tool instance.
+ * MCP tools have the original JSON schema attached as `mcpJsonSchema` property.
+ *
+ * @param tool - The loaded tool instance
+ * @returns Tool definition
+ */
+export function extractMCPToolDefinition(tool: MCPToolInstance): ToolDefinition {
+  const def: ToolDefinition = { name: tool.name };
+
+  if (tool.description) {
+    def.description = tool.description;
+  }
+
+  if (tool.mcpJsonSchema) {
+    def.parameters = tool.mcpJsonSchema;
+  }
+
+  const serverName = getServerNameFromTool(tool.name);
+  if (serverName) {
+    def.serverName = serverName;
+  }
+
+  return def;
+}
+
+/**
+ * Checks if a tool is an MCP tool based on its properties.
+ * @param tool - The tool to check (can be any object with potential mcp property)
+ * @returns Whether the tool is an MCP tool
+ */
+export function isMCPTool(tool: unknown): tool is MCPToolInstance {
+  return typeof tool === 'object' && tool !== null && (tool as MCPToolInstance).mcp === true;
+}
+
+/**
+ * Cleans up the temporary mcpJsonSchema property from MCP tools after registry is populated.
+ * This property is only needed during registry building and can be safely removed afterward.
+ *
+ * @param tools - Array of tools to clean up
+ */
+export function cleanupMCPToolSchemas(tools: MCPToolInstance[]): void {
+  for (const tool of tools) {
+    if (tool.mcpJsonSchema !== undefined) {
+      delete tool.mcpJsonSchema;
+    }
+  }
+}
+
+/** Builds tool registry from MCP tool definitions. */
+function buildToolRegistry(
+  mcpToolDefs: ToolDefinition[],
+  agentToolOptions?: AgentToolOptions,
+): LCToolRegistry {
+  if (agentToolOptions && Object.keys(agentToolOptions).length > 0) {
+    return buildToolRegistryFromAgentOptions(mcpToolDefs, agentToolOptions);
+  }
+
+  /** No agent options - build basic definitions for event-driven mode */
+  const registry: LCToolRegistry = new Map<string, LCTool>();
+  for (const toolDef of mcpToolDefs) {
+    registry.set(toolDef.name, {
+      name: toolDef.name,
+      description: toolDef.description,
+      parameters: toolDef.parameters,
+      serverName: toolDef.serverName,
+      toolType: 'mcp',
+    });
+  }
+  return registry;
+}
+
+/** Parameters for building tool classification and creating PTC/tool search tools */
+export interface BuildToolClassificationParams {
+  /** All loaded tools (will be filtered for MCP tools) */
+  loadedTools: GenericTool[];
+  /** User ID for auth lookup */
+  userId: string;
+  /** Agent ID (used for logging and context) */
+  agentId?: string;
+  /** Per-tool configuration from the agent */
+  agentToolOptions?: AgentToolOptions;
+  /** Whether the deferred_tools capability is enabled (from agent config) */
+  deferredToolsEnabled?: boolean;
+  /** When true, skip creating tool instances (for event-driven mode) */
+  definitionsOnly?: boolean;
+  /** Function to load auth values (dependency injection) */
+  loadAuthValues: (params: {
+    userId: string;
+    authFields: string[];
+  }) => Promise<Record<string, string>>;
+}
+
+/** Result from building tool classification */
+export interface BuildToolClassificationResult {
+  /** Tool registry built from MCP tools (undefined if no MCP tools) */
+  toolRegistry?: LCToolRegistry;
+  /** Tool definitions array for event-driven execution (built simultaneously with registry) */
+  toolDefinitions: LCTool[];
+  /** Additional tools created (PTC and/or tool search) */
+  additionalTools: GenericTool[];
+  /** Whether any tools have defer_loading enabled (precomputed for efficiency) */
+  hasDeferredTools: boolean;
+}
+
+/**
+ * Checks if an agent's tools have any that match PTC patterns (programmatic only or dual context).
+ * @param toolRegistry - The tool registry to check
+ * @returns Whether any tools are configured for programmatic calling
+ */
+export function agentHasProgrammaticTools(toolRegistry: LCToolRegistry): boolean {
+  for (const toolDef of toolRegistry.values()) {
+    if (toolDef.allowed_callers?.includes('code_execution')) {
+      return true;
+    }
+  }
+  return false;
+}
+
+/**
+ * Checks if an agent's tools have any that are deferred.
+ * @param toolRegistry - The tool registry to check
+ * @returns Whether any tools are configured as deferred
+ */
+export function agentHasDeferredTools(toolRegistry: LCToolRegistry): boolean {
+  for (const toolDef of toolRegistry.values()) {
+    if (toolDef.defer_loading === true) {
+      return true;
+    }
+  }
+  return false;
+}
+
+/**
+ * Builds the tool registry from MCP tools and conditionally creates PTC and tool search tools.
+ *
+ * This function:
+ * 1. Filters loaded tools for MCP tools
+ * 2. Extracts tool definitions and builds the registry from agent's tool_options
+ * 3. Cleans up temporary mcpJsonSchema properties
+ * 4. Creates PTC tool only if agent has tools configured for programmatic calling
+ * 5. Creates tool search tool only if agent has deferred tools
+ *
+ * @param params - Parameters including loaded tools, userId, agentId, agentToolOptions, and dependencies
+ * @returns Tool registry and any additional tools created
+ */
+export async function buildToolClassification(
+  params: BuildToolClassificationParams,
+): Promise<BuildToolClassificationResult> {
+  const {
+    userId,
+    agentId,
+    loadedTools,
+    agentToolOptions,
+    definitionsOnly = false,
+    deferredToolsEnabled = true,
+    loadAuthValues,
+  } = params;
+  const additionalTools: GenericTool[] = [];
+
+  const mcpTools = loadedTools.filter(isMCPTool);
+  if (mcpTools.length === 0) {
+    return {
+      additionalTools,
+      toolDefinitions: [],
+      toolRegistry: undefined,
+      hasDeferredTools: false,
+    };
+  }
+
+  const mcpToolDefs = mcpTools.map(extractMCPToolDefinition);
+  const toolRegistry: LCToolRegistry = buildToolRegistry(mcpToolDefs, agentToolOptions);
+
+  /** Clean up temporary mcpJsonSchema property from tools now that registry is populated */
+  cleanupMCPToolSchemas(mcpTools);
+
+  /**
+   * Check if this agent actually has tools configured for these features.
+   * Only enable PTC if the agent has programmatic tools.
+   * Only enable tool search if the agent has deferred tools AND the capability is enabled.
+   */
+  const hasProgrammaticTools = agentHasProgrammaticTools(toolRegistry);
+  const hasDeferredTools = deferredToolsEnabled && agentHasDeferredTools(toolRegistry);
+
+  /** Clear defer_loading if capability disabled */
+  if (!deferredToolsEnabled) {
+    for (const toolDef of toolRegistry.values()) {
+      if (toolDef.defer_loading !== true) {
+        continue;
+      }
+      toolDef.defer_loading = false;
+    }
+  }
+
+  /** Build toolDefinitions array from registry (single pass, reused) */
+  const toolDefinitions: LCTool[] = Array.from(toolRegistry.values());
+
+  /** No programmatic or deferred tools - skip PTC/ToolSearch */
+  if (!hasProgrammaticTools && !hasDeferredTools) {
+    logger.debug(
+      `[buildToolClassification] Agent ${agentId} has no programmatic or deferred tools, skipping PTC/ToolSearch`,
+    );
+    return { toolRegistry, toolDefinitions, additionalTools, hasDeferredTools: false };
+  }
+
+  /** Tool search uses local mode (no API key needed) */
+  if (hasDeferredTools) {
+    if (!definitionsOnly) {
+      const toolSearchTool = createToolSearch({
+        mode: 'local',
+        toolRegistry,
+      });
+      additionalTools.push(toolSearchTool);
+    }
+
+    /** Add ToolSearch definition for event-driven mode */
+    toolDefinitions.push({
+      name: ToolSearchToolDefinition.name,
+      description: ToolSearchToolDefinition.description,
+      parameters: ToolSearchToolDefinition.schema as unknown as LCTool['parameters'],
+    });
+    toolRegistry.set(ToolSearchToolDefinition.name, {
+      name: ToolSearchToolDefinition.name,
+      allowed_callers: ['direct'],
+    });
+
+    logger.debug(`[buildToolClassification] Tool Search enabled for agent ${agentId}`);
+  }
+
+  /** PTC requires CODE_API_KEY for sandbox execution */
+  if (!hasProgrammaticTools) {
+    return { toolRegistry, toolDefinitions, additionalTools, hasDeferredTools };
+  }
+
+  /** In definitions-only mode, add PTC definition without creating the tool instance */
+  if (definitionsOnly) {
+    toolDefinitions.push({
+      name: ProgrammaticToolCallingDefinition.name,
+      description: ProgrammaticToolCallingDefinition.description,
+      parameters: ProgrammaticToolCallingDefinition.schema as unknown as LCTool['parameters'],
+    });
+    toolRegistry.set(ProgrammaticToolCallingDefinition.name, {
+      name: ProgrammaticToolCallingDefinition.name,
+      allowed_callers: ['direct'],
+    });
+    logger.debug(
+      `[buildToolClassification] PTC definition added for agent ${agentId} (definitions only)`,
+    );
+    return { toolRegistry, toolDefinitions, additionalTools, hasDeferredTools };
+  }
+
+  try {
+    const authValues = await loadAuthValues({
+      userId,
+      authFields: [EnvVar.CODE_API_KEY],
+    });
+    const codeApiKey = authValues[EnvVar.CODE_API_KEY];
+
+    if (!codeApiKey) {
+      logger.warn('[buildToolClassification] PTC configured but CODE_API_KEY not available');
+      return { toolRegistry, toolDefinitions, additionalTools, hasDeferredTools };
+    }
+
+    const ptcTool = createProgrammaticToolCallingTool({ apiKey: codeApiKey });
+    additionalTools.push(ptcTool);
+
+    /** Add PTC definition for event-driven mode */
+    toolDefinitions.push({
+      name: ProgrammaticToolCallingDefinition.name,
+      description: ProgrammaticToolCallingDefinition.description,
+      parameters: ProgrammaticToolCallingDefinition.schema as unknown as LCTool['parameters'],
+    });
+    toolRegistry.set(ProgrammaticToolCallingDefinition.name, {
+      name: ProgrammaticToolCallingDefinition.name,
+      allowed_callers: ['direct'],
+    });
+
+    logger.debug(`[buildToolClassification] PTC tool enabled for agent ${agentId}`);
+  } catch (error) {
+    logger.error('[buildToolClassification] Error creating PTC tool:', error);
+  }
+
+  return { toolRegistry, toolDefinitions, additionalTools, hasDeferredTools };
+}
diff --git a/packages/api/src/tools/definitions.spec.ts b/packages/api/src/tools/definitions.spec.ts
new file mode 100644
index 0000000000..33ef43a75e
--- /dev/null
+++ b/packages/api/src/tools/definitions.spec.ts
@@ -0,0 +1,551 @@
+import { loadToolDefinitions } from './definitions';
+import type {
+  LoadToolDefinitionsParams,
+  LoadToolDefinitionsDeps,
+  ActionToolDefinition,
+} from './definitions';
+
+describe('definitions.ts', () => {
+  const mockLoadAuthValues = jest.fn().mockResolvedValue({});
+  const mockGetOrFetchMCPServerTools = jest.fn().mockResolvedValue(null);
+  const mockIsBuiltInTool = jest.fn().mockReturnValue(false);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('loadToolDefinitions', () => {
+    it('should return empty result for empty tools array', async () => {
+      const params: LoadToolDefinitionsParams = {
+        userId: 'user-123',
+        agentId: 'agent-123',
+        tools: [],
+      };
+
+      const deps: LoadToolDefinitionsDeps = {
+        getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+        isBuiltInTool: mockIsBuiltInTool,
+        loadAuthValues: mockLoadAuthValues,
+      };
+
+      const result = await loadToolDefinitions(params, deps);
+
+      expect(result.toolDefinitions).toHaveLength(0);
+      expect(result.toolRegistry.size).toBe(0);
+      expect(result.hasDeferredTools).toBe(false);
+    });
+
+    describe('action tool definitions', () => {
+      it('should include parameters in action tool definitions', async () => {
+        const mockActionDefs: ActionToolDefinition[] = [
+          {
+            name: 'getWeather_action_weather_com',
+            description: 'Get weather for a location',
+            parameters: {
+              type: 'object',
+              properties: {
+                latitude: { type: 'number', description: 'Latitude coordinate' },
+                longitude: { type: 'number', description: 'Longitude coordinate' },
+              },
+              required: ['latitude', 'longitude'],
+            },
+          },
+        ];
+
+        const mockGetActionToolDefinitions = jest.fn().mockResolvedValue(mockActionDefs);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['getWeather_action_weather---com'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+          getActionToolDefinitions: mockGetActionToolDefinitions,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        expect(mockGetActionToolDefinitions).toHaveBeenCalledWith('agent-123', [
+          'getWeather_action_weather---com',
+        ]);
+
+        const actionDef = result.toolDefinitions.find(
+          (d) => d.name === 'getWeather_action_weather_com',
+        );
+        expect(actionDef).toBeDefined();
+        expect(actionDef?.parameters).toBeDefined();
+        expect(actionDef?.parameters?.type).toBe('object');
+        expect(actionDef?.parameters?.properties).toHaveProperty('latitude');
+        expect(actionDef?.parameters?.properties).toHaveProperty('longitude');
+        expect(actionDef?.parameters?.required).toContain('latitude');
+        expect(actionDef?.parameters?.required).toContain('longitude');
+      });
+
+      it('should handle action definitions without parameters', async () => {
+        const mockActionDefs: ActionToolDefinition[] = [
+          {
+            name: 'listItems_action_api_example_com',
+            description: 'List all items',
+          },
+        ];
+
+        const mockGetActionToolDefinitions = jest.fn().mockResolvedValue(mockActionDefs);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['listItems_action_api---example---com'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+          getActionToolDefinitions: mockGetActionToolDefinitions,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const actionDef = result.toolDefinitions.find(
+          (d) => d.name === 'listItems_action_api_example_com',
+        );
+        expect(actionDef).toBeDefined();
+        expect(actionDef?.parameters).toBeUndefined();
+      });
+
+      it('should not call getActionToolDefinitions when no action tools present', async () => {
+        const mockGetActionToolDefinitions = jest.fn();
+        mockIsBuiltInTool.mockReturnValue(true);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['calculator', 'web_search'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+          getActionToolDefinitions: mockGetActionToolDefinitions,
+        };
+
+        await loadToolDefinitions(params, deps);
+
+        expect(mockGetActionToolDefinitions).not.toHaveBeenCalled();
+      });
+    });
+
+    describe('built-in tool definitions', () => {
+      it('should include parameters for known built-in tools', async () => {
+        mockIsBuiltInTool.mockImplementation((name) => name === 'calculator');
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['calculator'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const calcDef = result.toolDefinitions.find((d) => d.name === 'calculator');
+        expect(calcDef).toBeDefined();
+        expect(calcDef?.parameters).toBeDefined();
+      });
+
+      it('should include parameters for execute_code native tool', async () => {
+        mockIsBuiltInTool.mockImplementation((name) => name === 'execute_code');
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['execute_code'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const execCodeDef = result.toolDefinitions.find((d) => d.name === 'execute_code');
+        expect(execCodeDef).toBeDefined();
+        expect(execCodeDef?.parameters).toBeDefined();
+        expect(execCodeDef?.parameters?.properties).toHaveProperty('lang');
+        expect(execCodeDef?.parameters?.properties).toHaveProperty('code');
+        expect(execCodeDef?.parameters?.required).toContain('lang');
+        expect(execCodeDef?.parameters?.required).toContain('code');
+      });
+
+      it('should include parameters for web_search native tool', async () => {
+        mockIsBuiltInTool.mockImplementation((name) => name === 'web_search');
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['web_search'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const webSearchDef = result.toolDefinitions.find((d) => d.name === 'web_search');
+        expect(webSearchDef).toBeDefined();
+        expect(webSearchDef?.parameters).toBeDefined();
+        expect(webSearchDef?.parameters?.properties).toHaveProperty('query');
+        expect(webSearchDef?.parameters?.required).toContain('query');
+      });
+
+      it('should include parameters for file_search native tool', async () => {
+        mockIsBuiltInTool.mockImplementation((name) => name === 'file_search');
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['file_search'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const fileSearchDef = result.toolDefinitions.find((d) => d.name === 'file_search');
+        expect(fileSearchDef).toBeDefined();
+        expect(fileSearchDef?.parameters).toBeDefined();
+        expect(fileSearchDef?.parameters?.properties).toHaveProperty('query');
+        expect(fileSearchDef?.parameters?.required).toContain('query');
+      });
+
+      it('should skip built-in tools without registry definitions', async () => {
+        mockIsBuiltInTool.mockImplementation((name) => name === 'unknown_tool');
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['unknown_tool'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const unknownDef = result.toolDefinitions.find((d) => d.name === 'unknown_tool');
+        expect(unknownDef).toBeUndefined();
+        expect(result.toolRegistry.has('unknown_tool')).toBe(false);
+      });
+
+      it('should include description and parameters in registry for built-in tools', async () => {
+        mockIsBuiltInTool.mockImplementation((name) => name === 'calculator');
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['calculator'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const registryEntry = result.toolRegistry.get('calculator');
+        expect(registryEntry).toBeDefined();
+        expect(registryEntry?.description).toBeDefined();
+        expect(registryEntry?.parameters).toBeDefined();
+        expect(registryEntry?.allowed_callers).toContain('direct');
+      });
+    });
+
+    describe('MCP tool definitions with server name variants', () => {
+      it('should load MCP tools with underscored server names (server_one)', async () => {
+        const mockServerTools = {
+          list_items_mcp_server_one: {
+            function: {
+              name: 'list_items_mcp_server_one',
+              description: 'List all items from server',
+              parameters: {
+                type: 'object',
+                properties: {
+                  limit: { type: 'number', description: 'Max items to return' },
+                },
+              },
+            },
+          },
+          get_item_mcp_server_one: {
+            function: {
+              name: 'get_item_mcp_server_one',
+              description: 'Get a specific item',
+              parameters: {
+                type: 'object',
+                properties: {
+                  id: { type: 'string', description: 'Item ID' },
+                },
+                required: ['id'],
+              },
+            },
+          },
+        };
+
+        mockGetOrFetchMCPServerTools.mockResolvedValue(mockServerTools);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['sys__all__sys_mcp_server_one'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        expect(mockGetOrFetchMCPServerTools).toHaveBeenCalledWith('user-123', 'server_one');
+        expect(result.toolDefinitions).toHaveLength(2);
+
+        const listItemsDef = result.toolDefinitions.find(
+          (d) => d.name === 'list_items_mcp_server_one',
+        );
+        expect(listItemsDef).toBeDefined();
+        expect(listItemsDef?.description).toBe('List all items from server');
+
+        const getItemDef = result.toolDefinitions.find((d) => d.name === 'get_item_mcp_server_one');
+        expect(getItemDef).toBeDefined();
+        expect(getItemDef?.description).toBe('Get a specific item');
+      });
+
+      it('should load MCP tools with hyphenated server names (server-one)', async () => {
+        const mockServerTools = {
+          'list_items_mcp_server-one': {
+            function: {
+              name: 'list_items_mcp_server-one',
+              description: 'List all items from server',
+              parameters: {
+                type: 'object',
+                properties: {
+                  limit: { type: 'number', description: 'Max items to return' },
+                },
+              },
+            },
+          },
+          'get_item_mcp_server-one': {
+            function: {
+              name: 'get_item_mcp_server-one',
+              description: 'Get a specific item',
+              parameters: {
+                type: 'object',
+                properties: {
+                  id: { type: 'string', description: 'Item ID' },
+                },
+                required: ['id'],
+              },
+            },
+          },
+        };
+
+        mockGetOrFetchMCPServerTools.mockResolvedValue(mockServerTools);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['sys__all__sys_mcp_server-one'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        expect(mockGetOrFetchMCPServerTools).toHaveBeenCalledWith('user-123', 'server-one');
+        expect(result.toolDefinitions).toHaveLength(2);
+
+        const listItemsDef = result.toolDefinitions.find(
+          (d) => d.name === 'list_items_mcp_server-one',
+        );
+        expect(listItemsDef).toBeDefined();
+        expect(listItemsDef?.description).toBe('List all items from server');
+
+        const getItemDef = result.toolDefinitions.find((d) => d.name === 'get_item_mcp_server-one');
+        expect(getItemDef).toBeDefined();
+        expect(getItemDef?.description).toBe('Get a specific item');
+      });
+
+      it('should handle individual MCP tool lookup with hyphenated server name', async () => {
+        const mockServerTools = {
+          'list_items_mcp_server-one': {
+            function: {
+              name: 'list_items_mcp_server-one',
+              description: 'List all items from server',
+              parameters: {
+                type: 'object',
+                properties: {},
+              },
+            },
+          },
+        };
+
+        mockGetOrFetchMCPServerTools.mockResolvedValue(mockServerTools);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['list_items_mcp_server-one'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        expect(mockGetOrFetchMCPServerTools).toHaveBeenCalledWith('user-123', 'server-one');
+        expect(result.toolDefinitions).toHaveLength(1);
+        expect(result.toolDefinitions[0].name).toBe('list_items_mcp_server-one');
+      });
+
+      it('should include hyphenated server name tools in registry with correct serverName', async () => {
+        const mockServerTools = {
+          'list_items_mcp_my-server': {
+            function: {
+              name: 'list_items_mcp_my-server',
+              description: 'List items',
+              parameters: { type: 'object', properties: {} },
+            },
+          },
+        };
+
+        mockGetOrFetchMCPServerTools.mockResolvedValue(mockServerTools);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['sys__all__sys_mcp_my-server'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        expect(result.toolDefinitions).toHaveLength(1);
+        expect(result.toolRegistry.size).toBeGreaterThan(0);
+
+        const toolDef = result.toolDefinitions[0];
+        expect(toolDef.name).toBe('list_items_mcp_my-server');
+        expect((toolDef as { serverName?: string }).serverName).toBe('my-server');
+      });
+    });
+
+    describe('tool registry metadata', () => {
+      it('should include description and parameters in registry for action tools', async () => {
+        const mockActionDefs: ActionToolDefinition[] = [
+          {
+            name: 'getWeather_action_weather_com',
+            description: 'Get weather for a location',
+            parameters: {
+              type: 'object',
+              properties: {
+                city: { type: 'string', description: 'City name' },
+              },
+              required: ['city'],
+            },
+          },
+        ];
+
+        const mockGetActionToolDefinitions = jest.fn().mockResolvedValue(mockActionDefs);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['getWeather_action_weather---com'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+          getActionToolDefinitions: mockGetActionToolDefinitions,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const registryEntry = result.toolRegistry.get('getWeather_action_weather_com');
+        expect(registryEntry).toBeDefined();
+        expect(registryEntry?.description).toBe('Get weather for a location');
+        expect(registryEntry?.parameters).toBeDefined();
+        expect(registryEntry?.parameters?.properties).toHaveProperty('city');
+        expect(registryEntry?.allowed_callers).toContain('direct');
+      });
+
+      it('should handle action tools without parameters in registry', async () => {
+        const mockActionDefs: ActionToolDefinition[] = [
+          {
+            name: 'ping_action_api_com',
+            description: 'Ping the API',
+          },
+        ];
+
+        const mockGetActionToolDefinitions = jest.fn().mockResolvedValue(mockActionDefs);
+
+        const params: LoadToolDefinitionsParams = {
+          userId: 'user-123',
+          agentId: 'agent-123',
+          tools: ['ping_action_api---com'],
+        };
+
+        const deps: LoadToolDefinitionsDeps = {
+          getOrFetchMCPServerTools: mockGetOrFetchMCPServerTools,
+          isBuiltInTool: mockIsBuiltInTool,
+          loadAuthValues: mockLoadAuthValues,
+          getActionToolDefinitions: mockGetActionToolDefinitions,
+        };
+
+        const result = await loadToolDefinitions(params, deps);
+
+        const registryEntry = result.toolRegistry.get('ping_action_api_com');
+        expect(registryEntry).toBeDefined();
+        expect(registryEntry?.description).toBe('Ping the API');
+        expect(registryEntry?.parameters).toBeUndefined();
+        expect(registryEntry?.allowed_callers).toContain('direct');
+      });
+    });
+  });
+});
diff --git a/packages/api/src/tools/definitions.ts b/packages/api/src/tools/definitions.ts
new file mode 100644
index 0000000000..a5b35ac7d8
--- /dev/null
+++ b/packages/api/src/tools/definitions.ts
@@ -0,0 +1,226 @@
+/**
+ * @fileoverview Tool definitions loader for event-driven mode.
+ * Loads tool definitions without creating tool instances for efficient initialization.
+ *
+ * @module packages/api/src/tools/definitions
+ */
+
+import { Constants, actionDelimiter } from 'librechat-data-provider';
+import type { AgentToolOptions } from 'librechat-data-provider';
+import type { LCToolRegistry, JsonSchemaType, LCTool, GenericTool } from '@librechat/agents';
+import type { ToolDefinition } from './classification';
+import { resolveJsonSchemaRefs, normalizeJsonSchema } from '~/mcp/zod';
+import { buildToolClassification } from './classification';
+import { getToolDefinition } from './registry/definitions';
+
+export interface MCPServerTool {
+  function?: {
+    name?: string;
+    description?: string;
+    parameters?: JsonSchemaType;
+  };
+}
+
+export type MCPServerTools = Record<string, MCPServerTool>;
+
+export interface LoadToolDefinitionsParams {
+  /** User ID for MCP server tool lookup */
+  userId: string;
+  /** Agent ID for tool classification */
+  agentId: string;
+  /** Agent's tool list (tool names/identifiers) */
+  tools: string[];
+  /** Agent-specific tool options */
+  toolOptions?: AgentToolOptions;
+  /** Whether deferred tools feature is enabled */
+  deferredToolsEnabled?: boolean;
+}
+
+export interface ActionToolDefinition {
+  name: string;
+  description?: string;
+  parameters?: JsonSchemaType;
+}
+
+export interface LoadToolDefinitionsDeps {
+  /** Gets MCP server tools - first checks cache, then initializes server if needed */
+  getOrFetchMCPServerTools: (userId: string, serverName: string) => Promise<MCPServerTools | null>;
+  /** Checks if a tool name is a known built-in tool */
+  isBuiltInTool: (toolName: string) => boolean;
+  /** Loads auth values for tool search (passed to buildToolClassification) */
+  loadAuthValues: (params: {
+    userId: string;
+    authFields: string[];
+  }) => Promise<Record<string, string>>;
+  /** Loads action tool definitions (schemas) from OpenAPI specs */
+  getActionToolDefinitions?: (
+    agentId: string,
+    actionToolNames: string[],
+  ) => Promise<ActionToolDefinition[]>;
+}
+
+export interface LoadToolDefinitionsResult {
+  toolDefinitions: (ToolDefinition | LCTool)[];
+  toolRegistry: LCToolRegistry;
+  hasDeferredTools: boolean;
+}
+
+const mcpToolPattern = /_mcp_/;
+
+/**
+ * Loads tool definitions without creating tool instances.
+ * This is the efficient path for event-driven mode where tools are loaded on-demand.
+ */
+export async function loadToolDefinitions(
+  params: LoadToolDefinitionsParams,
+  deps: LoadToolDefinitionsDeps,
+): Promise<LoadToolDefinitionsResult> {
+  const { userId, agentId, tools, toolOptions = {}, deferredToolsEnabled = false } = params;
+  const { getOrFetchMCPServerTools, isBuiltInTool, loadAuthValues, getActionToolDefinitions } =
+    deps;
+
+  const emptyResult: LoadToolDefinitionsResult = {
+    toolDefinitions: [],
+    toolRegistry: new Map(),
+    hasDeferredTools: false,
+  };
+
+  if (!tools || tools.length === 0) {
+    return emptyResult;
+  }
+
+  const mcpServerToolsCache = new Map<string, MCPServerTools>();
+  const mcpToolDefs: ToolDefinition[] = [];
+  const builtInToolDefs: ToolDefinition[] = [];
+  let actionToolDefs: ToolDefinition[] = [];
+  const actionToolNames: string[] = [];
+
+  const mcpAllPattern = `${Constants.mcp_all}${Constants.mcp_delimiter}`;
+
+  for (const toolName of tools) {
+    if (toolName.includes(actionDelimiter)) {
+      actionToolNames.push(toolName);
+      continue;
+    }
+
+    if (!mcpToolPattern.test(toolName)) {
+      if (!isBuiltInTool(toolName)) {
+        continue;
+      }
+      const registryDef = getToolDefinition(toolName);
+      if (!registryDef) {
+        continue;
+      }
+      builtInToolDefs.push({
+        name: toolName,
+        description: registryDef.description,
+        parameters: registryDef.schema as JsonSchemaType | undefined,
+      });
+      continue;
+    }
+
+    const parts = toolName.split(Constants.mcp_delimiter);
+    const serverName = parts[parts.length - 1];
+
+    if (!mcpServerToolsCache.has(serverName)) {
+      const serverTools = await getOrFetchMCPServerTools(userId, serverName);
+      mcpServerToolsCache.set(serverName, serverTools || {});
+    }
+
+    const serverTools = mcpServerToolsCache.get(serverName);
+    if (!serverTools) {
+      continue;
+    }
+
+    if (toolName.startsWith(mcpAllPattern)) {
+      for (const [actualToolName, toolDef] of Object.entries(serverTools)) {
+        if (toolDef?.function) {
+          mcpToolDefs.push({
+            name: actualToolName,
+            description: toolDef.function.description,
+            parameters: toolDef.function.parameters
+              ? normalizeJsonSchema(resolveJsonSchemaRefs(toolDef.function.parameters))
+              : undefined,
+            serverName,
+          });
+        }
+      }
+      continue;
+    }
+
+    const toolDef = serverTools[toolName];
+    if (toolDef?.function) {
+      mcpToolDefs.push({
+        name: toolName,
+        description: toolDef.function.description,
+        parameters: toolDef.function.parameters
+          ? normalizeJsonSchema(resolveJsonSchemaRefs(toolDef.function.parameters))
+          : undefined,
+        serverName,
+      });
+    }
+  }
+
+  if (actionToolNames.length > 0 && getActionToolDefinitions) {
+    const fetchedActionDefs = await getActionToolDefinitions(agentId, actionToolNames);
+    actionToolDefs = fetchedActionDefs.map((def) => ({
+      name: def.name,
+      description: def.description,
+      parameters: def.parameters,
+    }));
+  }
+
+  const loadedTools = mcpToolDefs.map((def) => ({
+    name: def.name,
+    description: def.description,
+    mcp: true as const,
+    mcpJsonSchema: def.parameters,
+  })) as unknown as GenericTool[];
+
+  const classificationResult = await buildToolClassification({
+    userId,
+    agentId,
+    loadedTools,
+    loadAuthValues,
+    deferredToolsEnabled,
+    definitionsOnly: true,
+    agentToolOptions: toolOptions,
+  });
+
+  const { toolDefinitions, hasDeferredTools } = classificationResult;
+  const toolRegistry: LCToolRegistry = classificationResult.toolRegistry ?? new Map();
+
+  for (const actionDef of actionToolDefs) {
+    if (!toolRegistry.has(actionDef.name)) {
+      toolRegistry.set(actionDef.name, {
+        name: actionDef.name,
+        description: actionDef.description,
+        parameters: actionDef.parameters,
+        allowed_callers: ['direct'],
+      });
+    }
+  }
+
+  for (const builtInDef of builtInToolDefs) {
+    if (!toolRegistry.has(builtInDef.name)) {
+      toolRegistry.set(builtInDef.name, {
+        name: builtInDef.name,
+        description: builtInDef.description,
+        parameters: builtInDef.parameters,
+        allowed_callers: ['direct'],
+      });
+    }
+  }
+
+  const allDefinitions: (ToolDefinition | LCTool)[] = [
+    ...toolDefinitions,
+    ...actionToolDefs.filter((d) => !toolDefinitions.some((td) => td.name === d.name)),
+    ...builtInToolDefs.filter((d) => !toolDefinitions.some((td) => td.name === d.name)),
+  ];
+
+  return {
+    toolDefinitions: allDefinitions,
+    toolRegistry,
+    hasDeferredTools,
+  };
+}
diff --git a/packages/api/src/tools/index.ts b/packages/api/src/tools/index.ts
index eb375902f1..8695d06707 100644
--- a/packages/api/src/tools/index.ts
+++ b/packages/api/src/tools/index.ts
@@ -1,2 +1,5 @@
 export * from './format';
+export * from './registry';
 export * from './toolkits';
+export * from './definitions';
+export * from './classification';
diff --git a/packages/api/src/tools/registry/definitions.ts b/packages/api/src/tools/registry/definitions.ts
new file mode 100644
index 0000000000..f8d1c83a7e
--- /dev/null
+++ b/packages/api/src/tools/registry/definitions.ts
@@ -0,0 +1,637 @@
+import {
+  WebSearchToolDefinition,
+  CalculatorToolDefinition,
+  CodeExecutionToolDefinition,
+} from '@librechat/agents';
+
+/** Extended JSON Schema type that includes standard validation keywords */
+export type ExtendedJsonSchema = {
+  type?: 'string' | 'number' | 'integer' | 'float' | 'boolean' | 'array' | 'object' | 'null';
+  enum?: (string | number | boolean | null)[];
+  items?: ExtendedJsonSchema;
+  properties?: Record<string, ExtendedJsonSchema>;
+  required?: string[];
+  description?: string;
+  additionalProperties?: boolean | ExtendedJsonSchema;
+  minLength?: number;
+  maxLength?: number;
+  minimum?: number;
+  maximum?: number;
+  minItems?: number;
+  maxItems?: number;
+  pattern?: string;
+  format?: string;
+  default?: unknown;
+  const?: unknown;
+  oneOf?: ExtendedJsonSchema[];
+  anyOf?: ExtendedJsonSchema[];
+  allOf?: ExtendedJsonSchema[];
+  $ref?: string;
+  $defs?: Record<string, ExtendedJsonSchema>;
+  definitions?: Record<string, ExtendedJsonSchema>;
+};
+
+export interface ToolRegistryDefinition {
+  name: string;
+  description: string;
+  schema: ExtendedJsonSchema;
+  description_for_model?: string;
+  responseFormat?: 'content_and_artifact' | 'content';
+  toolType: 'builtin' | 'mcp' | 'action' | 'custom';
+}
+
+/** Google Search tool JSON schema */
+export const googleSearchSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      minLength: 1,
+      description: 'The search query string.',
+    },
+    max_results: {
+      type: 'integer',
+      minimum: 1,
+      maximum: 10,
+      description: 'The maximum number of search results to return. Defaults to 5.',
+    },
+  },
+  required: ['query'],
+};
+
+/** DALL-E 3 tool JSON schema */
+export const dalle3Schema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      maxLength: 4000,
+      description:
+        'A text description of the desired image, following the rules, up to 4000 characters.',
+    },
+    style: {
+      type: 'string',
+      enum: ['vivid', 'natural'],
+      description:
+        'Must be one of `vivid` or `natural`. `vivid` generates hyper-real and dramatic images, `natural` produces more natural, less hyper-real looking images',
+    },
+    quality: {
+      type: 'string',
+      enum: ['hd', 'standard'],
+      description: 'The quality of the generated image. Only `hd` and `standard` are supported.',
+    },
+    size: {
+      type: 'string',
+      enum: ['1024x1024', '1792x1024', '1024x1792'],
+      description:
+        'The size of the requested image. Use 1024x1024 (square) as the default, 1792x1024 if the user requests a wide image, and 1024x1792 for full-body portraits. Always include this parameter in the request.',
+    },
+  },
+  required: ['prompt', 'style', 'quality', 'size'],
+};
+
+/** Flux API tool JSON schema */
+export const fluxApiSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    action: {
+      type: 'string',
+      enum: ['generate', 'list_finetunes', 'generate_finetuned'],
+      description:
+        'Action to perform: "generate" for image generation, "generate_finetuned" for finetuned model generation, "list_finetunes" to get available custom models',
+    },
+    prompt: {
+      type: 'string',
+      description:
+        'Text prompt for image generation. Required when action is "generate". Not used for list_finetunes.',
+    },
+    width: {
+      type: 'number',
+      description:
+        'Width of the generated image in pixels. Must be a multiple of 32. Default is 1024.',
+    },
+    height: {
+      type: 'number',
+      description:
+        'Height of the generated image in pixels. Must be a multiple of 32. Default is 768.',
+    },
+    prompt_upsampling: {
+      type: 'boolean',
+      description: 'Whether to perform upsampling on the prompt.',
+    },
+    steps: {
+      type: 'integer',
+      description: 'Number of steps to run the model for, a number from 1 to 50. Default is 40.',
+    },
+    seed: {
+      type: 'number',
+      description: 'Optional seed for reproducibility.',
+    },
+    safety_tolerance: {
+      type: 'number',
+      description:
+        'Tolerance level for input and output moderation. Between 0 and 6, 0 being most strict, 6 being least strict.',
+    },
+    endpoint: {
+      type: 'string',
+      enum: [
+        '/v1/flux-pro-1.1',
+        '/v1/flux-pro',
+        '/v1/flux-dev',
+        '/v1/flux-pro-1.1-ultra',
+        '/v1/flux-pro-finetuned',
+        '/v1/flux-pro-1.1-ultra-finetuned',
+      ],
+      description: 'Endpoint to use for image generation.',
+    },
+    raw: {
+      type: 'boolean',
+      description:
+        'Generate less processed, more natural-looking images. Only works for /v1/flux-pro-1.1-ultra.',
+    },
+    finetune_id: {
+      type: 'string',
+      description: 'ID of the finetuned model to use',
+    },
+    finetune_strength: {
+      type: 'number',
+      description: 'Strength of the finetuning effect (typically between 0.1 and 1.2)',
+    },
+    guidance: {
+      type: 'number',
+      description: 'Guidance scale for finetuned models',
+    },
+    aspect_ratio: {
+      type: 'string',
+      description: 'Aspect ratio for ultra models (e.g., "16:9")',
+    },
+  },
+  required: [],
+};
+
+/** OpenWeather tool JSON schema */
+export const openWeatherSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    action: {
+      type: 'string',
+      enum: ['help', 'current_forecast', 'timestamp', 'daily_aggregation', 'overview'],
+      description: 'The action to perform',
+    },
+    city: {
+      type: 'string',
+      description: 'City name for geocoding if lat/lon not provided',
+    },
+    lat: {
+      type: 'number',
+      description: 'Latitude coordinate',
+    },
+    lon: {
+      type: 'number',
+      description: 'Longitude coordinate',
+    },
+    exclude: {
+      type: 'string',
+      description: 'Parts to exclude from the response',
+    },
+    units: {
+      type: 'string',
+      enum: ['Celsius', 'Kelvin', 'Fahrenheit'],
+      description: 'Temperature units',
+    },
+    lang: {
+      type: 'string',
+      description: 'Language code',
+    },
+    date: {
+      type: 'string',
+      description: 'Date in YYYY-MM-DD format for timestamp and daily_aggregation',
+    },
+    tz: {
+      type: 'string',
+      description: 'Timezone',
+    },
+  },
+  required: ['action'],
+};
+
+/** Wolfram Alpha tool JSON schema */
+export const wolframSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    input: {
+      type: 'string',
+      description: 'Natural language query to WolframAlpha following the guidelines',
+    },
+  },
+  required: ['input'],
+};
+
+/** Stable Diffusion tool JSON schema */
+export const stableDiffusionSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      description:
+        'Detailed keywords to describe the subject, using at least 7 keywords to accurately describe the image, separated by comma',
+    },
+    negative_prompt: {
+      type: 'string',
+      description:
+        'Keywords we want to exclude from the final image, using at least 7 keywords to accurately describe the image, separated by comma',
+    },
+  },
+  required: ['prompt', 'negative_prompt'],
+};
+
+/** Azure AI Search tool JSON schema */
+export const azureAISearchSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      description: 'Search word or phrase to Azure AI Search',
+    },
+  },
+  required: ['query'],
+};
+
+/** Traversaal Search tool JSON schema */
+export const traversaalSearchSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      description:
+        "A properly written sentence to be interpreted by an AI to search the web according to the user's request.",
+    },
+  },
+  required: ['query'],
+};
+
+/** Tavily Search Results tool JSON schema */
+export const tavilySearchSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      minLength: 1,
+      description: 'The search query string.',
+    },
+    max_results: {
+      type: 'number',
+      minimum: 1,
+      maximum: 10,
+      description: 'The maximum number of search results to return. Defaults to 5.',
+    },
+    search_depth: {
+      type: 'string',
+      enum: ['basic', 'advanced'],
+      description:
+        'The depth of the search, affecting result quality and response time (`basic` or `advanced`). Default is basic for quick results and advanced for indepth high quality results but longer response time. Advanced calls equals 2 requests.',
+    },
+    include_images: {
+      type: 'boolean',
+      description:
+        'Whether to include a list of query-related images in the response. Default is False.',
+    },
+    include_answer: {
+      type: 'boolean',
+      description: 'Whether to include answers in the search results. Default is False.',
+    },
+    include_raw_content: {
+      type: 'boolean',
+      description: 'Whether to include raw content in the search results. Default is False.',
+    },
+    include_domains: {
+      type: 'array',
+      items: { type: 'string' },
+      description: 'A list of domains to specifically include in the search results.',
+    },
+    exclude_domains: {
+      type: 'array',
+      items: { type: 'string' },
+      description: 'A list of domains to specifically exclude from the search results.',
+    },
+    topic: {
+      type: 'string',
+      enum: ['general', 'news', 'finance'],
+      description:
+        'The category of the search. Use news ONLY if query SPECIFCALLY mentions the word "news".',
+    },
+    time_range: {
+      type: 'string',
+      enum: ['day', 'week', 'month', 'year', 'd', 'w', 'm', 'y'],
+      description: 'The time range back from the current date to filter results.',
+    },
+    days: {
+      type: 'number',
+      minimum: 1,
+      description: 'Number of days back from the current date to include. Only if topic is news.',
+    },
+    include_image_descriptions: {
+      type: 'boolean',
+      description:
+        'When include_images is true, also add a descriptive text for each image. Default is false.',
+    },
+  },
+  required: ['query'],
+};
+
+/** File Search tool JSON schema */
+export const fileSearchSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    query: {
+      type: 'string',
+      description:
+        "A natural language query to search for relevant information in the files. Be specific and use keywords related to the information you're looking for. The query will be used for semantic similarity matching against the file contents.",
+    },
+  },
+  required: ['query'],
+};
+
+/** OpenAI Image Generation tool JSON schema */
+export const imageGenOaiSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      maxLength: 32000,
+      description: `Describe the image you want in detail. 
+      Be highly specific—break your idea into layers: 
+      (1) main concept and subject,
+      (2) composition and position,
+      (3) lighting and mood,
+      (4) style, medium, or camera details,
+      (5) important features (age, expression, clothing, etc.),
+      (6) background.
+      Use positive, descriptive language and specify what should be included, not what to avoid. 
+      List number and characteristics of people/objects, and mention style/technical requirements (e.g., "DSLR photo, 85mm lens, golden hour").
+      Do not reference any uploaded images—use for new image creation from text only.`,
+    },
+    background: {
+      type: 'string',
+      enum: ['transparent', 'opaque', 'auto'],
+      description:
+        'Sets transparency for the background. Must be one of transparent, opaque or auto (default). When transparent, the output format should be png or webp.',
+    },
+    quality: {
+      type: 'string',
+      enum: ['auto', 'high', 'medium', 'low'],
+      description: 'The quality of the image. One of auto (default), high, medium, or low.',
+    },
+    size: {
+      type: 'string',
+      enum: ['auto', '1024x1024', '1536x1024', '1024x1536'],
+      description:
+        'The size of the generated image. One of 1024x1024, 1536x1024 (landscape), 1024x1536 (portrait), or auto (default).',
+    },
+  },
+  required: ['prompt'],
+};
+
+/** OpenAI Image Edit tool JSON schema */
+export const imageEditOaiSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    image_ids: {
+      type: 'array',
+      items: { type: 'string' },
+      minItems: 1,
+      description: `IDs (image ID strings) of previously generated or uploaded images that should guide the edit.
+
+Guidelines:
+- If the user's request depends on any prior image(s), copy their image IDs into the \`image_ids\` array (in the same order the user refers to them).  
+- Never invent or hallucinate IDs; only use IDs that are still visible in the conversation context.
+- If no earlier image is relevant, omit the field entirely.`,
+    },
+    prompt: {
+      type: 'string',
+      maxLength: 32000,
+      description: `Describe the changes, enhancements, or new ideas to apply to the uploaded image(s).
+      Be highly specific—break your request into layers: 
+      (1) main concept or transformation,
+      (2) specific edits/replacements or composition guidance,
+      (3) desired style, mood, or technique,
+      (4) features/items to keep, change, or add (such as objects, people, clothing, lighting, etc.).
+      Use positive, descriptive language and clarify what should be included or changed, not what to avoid.
+      Always base this prompt on the most recently uploaded reference images.`,
+    },
+    quality: {
+      type: 'string',
+      enum: ['auto', 'high', 'medium', 'low'],
+      description:
+        'The quality of the image. One of auto (default), high, medium, or low. High/medium/low only supported for gpt-image-1.',
+    },
+    size: {
+      type: 'string',
+      enum: ['auto', '1024x1024', '1536x1024', '1024x1536', '256x256', '512x512'],
+      description:
+        'The size of the generated images. For gpt-image-1: auto (default), 1024x1024, 1536x1024, 1024x1536. For dall-e-2: 256x256, 512x512, 1024x1024.',
+    },
+  },
+  required: ['image_ids', 'prompt'],
+};
+
+/** Gemini Image Generation tool JSON schema */
+export const geminiImageGenSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      maxLength: 32000,
+      description:
+        'A detailed text description of the desired image, up to 32000 characters. For "editing" requests, describe the changes you want to make to the referenced image. Be specific about composition, style, lighting, and subject matter.',
+    },
+    image_ids: {
+      type: 'array',
+      items: { type: 'string' },
+      description: `Optional array of image IDs to use as visual context for generation.
+
+Guidelines:
+- For "editing" requests: ALWAYS include the image ID being "edited"
+- For new generation with context: Include any relevant reference image IDs
+- If the user's request references any prior images, include their image IDs in this array
+- These images will be used as visual context/inspiration for the new generation
+- Never invent or hallucinate IDs; only use IDs that are visible in the conversation
+- If no images are relevant, omit this field entirely`,
+    },
+    aspectRatio: {
+      type: 'string',
+      enum: ['1:1', '2:3', '3:2', '3:4', '4:3', '4:5', '5:4', '9:16', '16:9', '21:9'],
+      description:
+        'The aspect ratio of the generated image. Use 16:9 or 3:2 for landscape, 9:16 or 2:3 for portrait, 21:9 for ultra-wide/cinematic, 1:1 for square. Defaults to 1:1 if not specified.',
+    },
+    imageSize: {
+      type: 'string',
+      enum: ['1K', '2K', '4K'],
+      description:
+        'The resolution of the generated image. Use 1K for standard, 2K for high, 4K for maximum quality. Defaults to 1K if not specified.',
+    },
+  },
+  required: ['prompt'],
+};
+
+/** Tool definitions registry - maps tool names to their definitions */
+export const toolDefinitions: Record<string, ToolRegistryDefinition> = {
+  google: {
+    name: 'google',
+    description:
+      'A search engine optimized for comprehensive, accurate, and trusted results. Useful for when you need to answer questions about current events.',
+    schema: googleSearchSchema,
+    toolType: 'builtin',
+  },
+  dalle: {
+    name: 'dalle',
+    description: `Use DALLE to create images from text descriptions.
+    - It requires prompts to be in English, detailed, and to specify image type and human features for diversity.
+    - Create only one image, without repeating or listing descriptions outside the "prompts" field.
+    - Maintains the original intent of the description, with parameters for image style, quality, and size to tailor the output.`,
+    schema: dalle3Schema,
+    toolType: 'builtin',
+  },
+  flux: {
+    name: 'flux',
+    description:
+      'Use Flux to generate images from text descriptions. This tool can generate images and list available finetunes. Each generate call creates one image. For multiple images, make multiple consecutive calls.',
+    schema: fluxApiSchema,
+    toolType: 'builtin',
+  },
+  open_weather: {
+    name: 'open_weather',
+    description:
+      'Provides weather data from OpenWeather One Call API 3.0. Actions: help, current_forecast, timestamp, daily_aggregation, overview. If lat/lon not provided, specify "city" for geocoding. Units: "Celsius", "Kelvin", or "Fahrenheit" (default: Celsius). For timestamp action, use "date" in YYYY-MM-DD format.',
+    schema: openWeatherSchema,
+    toolType: 'builtin',
+  },
+  wolfram: {
+    name: 'wolfram',
+    description:
+      'WolframAlpha offers computation, math, curated knowledge, and real-time data. It handles natural language queries and performs complex calculations. Follow the guidelines to get the best results.',
+    schema: wolframSchema,
+    toolType: 'builtin',
+  },
+  'stable-diffusion': {
+    name: 'stable-diffusion',
+    description:
+      "You can generate images using text with 'stable-diffusion'. This tool is exclusively for visual content.",
+    schema: stableDiffusionSchema,
+    toolType: 'builtin',
+  },
+  'azure-ai-search': {
+    name: 'azure-ai-search',
+    description: "Use the 'azure-ai-search' tool to retrieve search results relevant to your input",
+    schema: azureAISearchSchema,
+    toolType: 'builtin',
+  },
+  traversaal_search: {
+    name: 'traversaal_search',
+    description:
+      'An AI search engine optimized for comprehensive, accurate, and trusted results. Useful for when you need to answer questions about current events. Input should be a search query.',
+    schema: traversaalSearchSchema,
+    toolType: 'builtin',
+  },
+  tavily_search_results_json: {
+    name: 'tavily_search_results_json',
+    description:
+      'A search engine optimized for comprehensive, accurate, and trusted results. Useful for when you need to answer questions about current events.',
+    schema: tavilySearchSchema,
+    toolType: 'builtin',
+  },
+  file_search: {
+    name: 'file_search',
+    description:
+      'Performs semantic search across attached "file_search" documents using natural language queries. This tool analyzes the content of uploaded files to find relevant information, quotes, and passages that best match your query.',
+    schema: fileSearchSchema,
+    toolType: 'builtin',
+    responseFormat: 'content_and_artifact',
+  },
+  image_gen_oai: {
+    name: 'image_gen_oai',
+    description: `Generates high-quality, original images based solely on text, not using any uploaded reference images.
+
+When to use \`image_gen_oai\`:
+- To create entirely new images from detailed text descriptions that do NOT reference any image files.
+
+When NOT to use \`image_gen_oai\`:
+- If the user has uploaded any images and requests modifications, enhancements, or remixing based on those uploads → use \`image_edit_oai\` instead.
+
+Generated image IDs will be returned in the response, so you can refer to them in future requests made to \`image_edit_oai\`.`,
+    schema: imageGenOaiSchema,
+    toolType: 'builtin',
+    responseFormat: 'content_and_artifact',
+  },
+  image_edit_oai: {
+    name: 'image_edit_oai',
+    description: `Generates high-quality, original images based on text and one or more uploaded/referenced images.
+
+When to use \`image_edit_oai\`:
+- The user wants to modify, extend, or remix one **or more** uploaded images, either:
+- Previously generated, or in the current request (both to be included in the \`image_ids\` array).
+- Always when the user refers to uploaded images for editing, enhancement, remixing, style transfer, or combining elements.
+- Any current or existing images are to be used as visual guides.
+- If there are any files in the current request, they are more likely than not expected as references for image edit requests.
+
+When NOT to use \`image_edit_oai\`:
+- Brand-new generations that do not rely on an existing image → use \`image_gen_oai\` instead.
+
+Both generated and referenced image IDs will be returned in the response, so you can refer to them in future requests made to \`image_edit_oai\`.`,
+    schema: imageEditOaiSchema,
+    toolType: 'builtin',
+    responseFormat: 'content_and_artifact',
+  },
+  gemini_image_gen: {
+    name: 'gemini_image_gen',
+    description: `Generates high-quality, original images based on text prompts, with optional image context.
+
+When to use \`gemini_image_gen\`:
+- To create entirely new images from detailed text descriptions
+- To generate images using existing images as context or inspiration
+- When the user requests image generation, creation, or asks to "generate an image"
+- When the user asks to "edit", "modify", "change", or "swap" elements in an image (generates new image with changes)
+
+When NOT to use \`gemini_image_gen\`:
+- For uploading or saving existing images without modification
+
+Generated image IDs will be returned in the response, so you can refer to them in future requests.`,
+    schema: geminiImageGenSchema,
+    toolType: 'builtin',
+    responseFormat: 'content_and_artifact',
+  },
+};
+
+/** Tool definitions from @librechat/agents */
+const agentToolDefinitions: Record<string, ToolRegistryDefinition> = {
+  [CalculatorToolDefinition.name]: {
+    name: CalculatorToolDefinition.name,
+    description: CalculatorToolDefinition.description,
+    schema: CalculatorToolDefinition.schema as unknown as ExtendedJsonSchema,
+    toolType: 'builtin',
+  },
+  [CodeExecutionToolDefinition.name]: {
+    name: CodeExecutionToolDefinition.name,
+    description: CodeExecutionToolDefinition.description,
+    schema: CodeExecutionToolDefinition.schema as unknown as ExtendedJsonSchema,
+    toolType: 'builtin',
+  },
+  [WebSearchToolDefinition.name]: {
+    name: WebSearchToolDefinition.name,
+    description: WebSearchToolDefinition.description,
+    schema: WebSearchToolDefinition.schema as unknown as ExtendedJsonSchema,
+    toolType: 'builtin',
+  },
+};
+
+export function getToolDefinition(toolName: string): ToolRegistryDefinition | undefined {
+  return toolDefinitions[toolName] ?? agentToolDefinitions[toolName];
+}
+
+export function getAllToolDefinitions(): ToolRegistryDefinition[] {
+  return [...Object.values(toolDefinitions), ...Object.values(agentToolDefinitions)];
+}
+
+export function getToolSchema(toolName: string): ExtendedJsonSchema | undefined {
+  return getToolDefinition(toolName)?.schema;
+}
diff --git a/packages/api/src/tools/registry/index.ts b/packages/api/src/tools/registry/index.ts
new file mode 100644
index 0000000000..9b9d6c8afa
--- /dev/null
+++ b/packages/api/src/tools/registry/index.ts
@@ -0,0 +1 @@
+export * from './definitions';
diff --git a/packages/api/src/tools/toolkits/gemini.ts b/packages/api/src/tools/toolkits/gemini.ts
index 3785856fbb..5eb0cec9fd 100644
--- a/packages/api/src/tools/toolkits/gemini.ts
+++ b/packages/api/src/tools/toolkits/gemini.ts
@@ -1,4 +1,4 @@
-import { z } from 'zod';
+import type { ExtendedJsonSchema } from '../registry/definitions';
 
 /** Default description for Gemini image generation tool */
 const DEFAULT_GEMINI_IMAGE_GEN_DESCRIPTION =
@@ -46,6 +46,35 @@ const getGeminiImageIdsDescription = () => {
   return process.env.GEMINI_IMAGE_IDS_DESCRIPTION || DEFAULT_GEMINI_IMAGE_IDS_DESCRIPTION;
 };
 
+const geminiImageGenJsonSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      maxLength: 32000,
+      description: getGeminiImageGenPromptDescription(),
+    },
+    image_ids: {
+      type: 'array',
+      items: { type: 'string' },
+      description: getGeminiImageIdsDescription(),
+    },
+    aspectRatio: {
+      type: 'string',
+      enum: ['1:1', '2:3', '3:2', '3:4', '4:3', '4:5', '5:4', '9:16', '16:9', '21:9'],
+      description:
+        'The aspect ratio of the generated image. Use 16:9 or 3:2 for landscape, 9:16 or 2:3 for portrait, 21:9 for ultra-wide/cinematic, 1:1 for square. Defaults to 1:1 if not specified.',
+    },
+    imageSize: {
+      type: 'string',
+      enum: ['1K', '2K', '4K'],
+      description:
+        'The resolution of the generated image. Use 1K for standard, 2K for high, 4K for maximum quality. Defaults to 1K if not specified.',
+    },
+  },
+  required: ['prompt'],
+};
+
 export const geminiToolkit = {
   gemini_image_gen: {
     name: 'gemini_image_gen' as const,
@@ -77,22 +106,7 @@ export const geminiToolkit = {
 9. Use imageSize to control the resolution: 1K (standard), 2K (high), 4K (maximum quality).
 
 The prompt should be a detailed paragraph describing every part of the image in concrete, objective detail.`,
-    schema: z.object({
-      prompt: z.string().max(32000).describe(getGeminiImageGenPromptDescription()),
-      image_ids: z.array(z.string()).optional().describe(getGeminiImageIdsDescription()),
-      aspectRatio: z
-        .enum(['1:1', '2:3', '3:2', '3:4', '4:3', '4:5', '5:4', '9:16', '16:9', '21:9'])
-        .optional()
-        .describe(
-          'The aspect ratio of the generated image. Use 16:9 or 3:2 for landscape, 9:16 or 2:3 for portrait, 21:9 for ultra-wide/cinematic, 1:1 for square. Defaults to 1:1 if not specified.',
-        ),
-      imageSize: z
-        .enum(['1K', '2K', '4K'])
-        .optional()
-        .describe(
-          'The resolution of the generated image. Use 1K for standard, 2K for high, 4K for maximum quality. Defaults to 1K if not specified.',
-        ),
-    }),
+    schema: geminiImageGenJsonSchema,
     responseFormat: 'content_and_artifact' as const,
   },
 } as const;
diff --git a/packages/api/src/tools/toolkits/imageContext.ts b/packages/api/src/tools/toolkits/imageContext.ts
index 0485ed815a..723f173104 100644
--- a/packages/api/src/tools/toolkits/imageContext.ts
+++ b/packages/api/src/tools/toolkits/imageContext.ts
@@ -35,4 +35,3 @@ export function buildImageToolContext({
   }
   return toolContext;
 }
-
diff --git a/packages/api/src/tools/toolkits/index.ts b/packages/api/src/tools/toolkits/index.ts
index ce9e0584c4..efc2467b45 100644
--- a/packages/api/src/tools/toolkits/index.ts
+++ b/packages/api/src/tools/toolkits/index.ts
@@ -1,3 +1,4 @@
 export * from './gemini';
 export * from './imageContext';
 export * from './oai';
+export * from './web';
diff --git a/packages/api/src/tools/toolkits/oai.ts b/packages/api/src/tools/toolkits/oai.ts
index 0881a0148a..9786b0571d 100644
--- a/packages/api/src/tools/toolkits/oai.ts
+++ b/packages/api/src/tools/toolkits/oai.ts
@@ -1,4 +1,4 @@
-import { z } from 'zod';
+import type { ExtendedJsonSchema } from '../registry/definitions';
 
 /** Default descriptions for image generation tool  */
 const DEFAULT_IMAGE_GEN_DESCRIPTION =
@@ -67,87 +67,81 @@ const getImageEditPromptDescription = () => {
   return process.env.IMAGE_EDIT_OAI_PROMPT_DESCRIPTION || DEFAULT_IMAGE_EDIT_PROMPT_DESCRIPTION;
 };
 
+const imageGenOaiJsonSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    prompt: {
+      type: 'string',
+      maxLength: 32000,
+      description: getImageGenPromptDescription(),
+    },
+    background: {
+      type: 'string',
+      enum: ['transparent', 'opaque', 'auto'],
+      description:
+        'Sets transparency for the background. Must be one of transparent, opaque or auto (default). When transparent, the output format should be png or webp.',
+    },
+    quality: {
+      type: 'string',
+      enum: ['auto', 'high', 'medium', 'low'],
+      description: 'The quality of the image. One of auto (default), high, medium, or low.',
+    },
+    size: {
+      type: 'string',
+      enum: ['auto', '1024x1024', '1536x1024', '1024x1536'],
+      description:
+        'The size of the generated image. One of 1024x1024, 1536x1024 (landscape), 1024x1536 (portrait), or auto (default).',
+    },
+  },
+  required: ['prompt'],
+};
+
+const imageEditOaiJsonSchema: ExtendedJsonSchema = {
+  type: 'object',
+  properties: {
+    image_ids: {
+      type: 'array',
+      items: { type: 'string' },
+      minItems: 1,
+      description: `IDs (image ID strings) of previously generated or uploaded images that should guide the edit.
+
+Guidelines:
+- If the user's request depends on any prior image(s), copy their image IDs into the \`image_ids\` array (in the same order the user refers to them).  
+- Never invent or hallucinate IDs; only use IDs that are still visible in the conversation context.
+- If no earlier image is relevant, omit the field entirely.`,
+    },
+    prompt: {
+      type: 'string',
+      maxLength: 32000,
+      description: getImageEditPromptDescription(),
+    },
+    quality: {
+      type: 'string',
+      enum: ['auto', 'high', 'medium', 'low'],
+      description:
+        'The quality of the image. One of auto (default), high, medium, or low. High/medium/low only supported for gpt-image-1.',
+    },
+    size: {
+      type: 'string',
+      enum: ['auto', '1024x1024', '1536x1024', '1024x1536', '256x256', '512x512'],
+      description:
+        'The size of the generated images. For gpt-image-1: auto (default), 1024x1024, 1536x1024, 1024x1536. For dall-e-2: 256x256, 512x512, 1024x1024.',
+    },
+  },
+  required: ['image_ids', 'prompt'],
+};
+
 export const oaiToolkit = {
   image_gen_oai: {
     name: 'image_gen_oai' as const,
     description: getImageGenDescription(),
-    schema: z.object({
-      prompt: z.string().max(32000).describe(getImageGenPromptDescription()),
-      background: z
-        .enum(['transparent', 'opaque', 'auto'])
-        .optional()
-        .describe(
-          'Sets transparency for the background. Must be one of transparent, opaque or auto (default). When transparent, the output format should be png or webp.',
-        ),
-      /*
-        n: z
-          .number()
-          .int()
-          .min(1)
-          .max(10)
-          .optional()
-          .describe('The number of images to generate. Must be between 1 and 10.'),
-        output_compression: z
-          .number()
-          .int()
-          .min(0)
-          .max(100)
-          .optional()
-          .describe('The compression level (0-100%) for webp or jpeg formats. Defaults to 100.'),
-           */
-      quality: z
-        .enum(['auto', 'high', 'medium', 'low'])
-        .optional()
-        .describe('The quality of the image. One of auto (default), high, medium, or low.'),
-      size: z
-        .enum(['auto', '1024x1024', '1536x1024', '1024x1536'])
-        .optional()
-        .describe(
-          'The size of the generated image. One of 1024x1024, 1536x1024 (landscape), 1024x1536 (portrait), or auto (default).',
-        ),
-    }),
+    schema: imageGenOaiJsonSchema,
     responseFormat: 'content_and_artifact' as const,
   } as const,
   image_edit_oai: {
     name: 'image_edit_oai' as const,
     description: getImageEditDescription(),
-    schema: z.object({
-      image_ids: z
-        .array(z.string())
-        .min(1)
-        .describe(
-          `
-IDs (image ID strings) of previously generated or uploaded images that should guide the edit.
-
-Guidelines:
-- If the user's request depends on any prior image(s), copy their image IDs into the \`image_ids\` array (in the same order the user refers to them).  
-- Never invent or hallucinate IDs; only use IDs that are still visible in the conversation context.
-- If no earlier image is relevant, omit the field entirely.
-`.trim(),
-        ),
-      prompt: z.string().max(32000).describe(getImageEditPromptDescription()),
-      /*
-        n: z
-          .number()
-          .int()
-          .min(1)
-          .max(10)
-          .optional()
-          .describe('The number of images to generate. Must be between 1 and 10. Defaults to 1.'),
-        */
-      quality: z
-        .enum(['auto', 'high', 'medium', 'low'])
-        .optional()
-        .describe(
-          'The quality of the image. One of auto (default), high, medium, or low. High/medium/low only supported for gpt-image-1.',
-        ),
-      size: z
-        .enum(['auto', '1024x1024', '1536x1024', '1024x1536', '256x256', '512x512'])
-        .optional()
-        .describe(
-          'The size of the generated images. For gpt-image-1: auto (default), 1024x1024, 1536x1024, 1024x1536. For dall-e-2: 256x256, 512x512, 1024x1024.',
-        ),
-    }),
+    schema: imageEditOaiJsonSchema,
     responseFormat: 'content_and_artifact' as const,
   },
 } as const;
diff --git a/packages/api/src/tools/toolkits/web.ts b/packages/api/src/tools/toolkits/web.ts
new file mode 100644
index 0000000000..2c71aa41d2
--- /dev/null
+++ b/packages/api/src/tools/toolkits/web.ts
@@ -0,0 +1,23 @@
+import { Tools, replaceSpecialVars } from 'librechat-data-provider';
+
+/** Builds the web search tool context with citation format instructions. */
+export function buildWebSearchContext(): string {
+  return `# \`${Tools.web_search}\`:
+Current Date & Time: ${replaceSpecialVars({ text: '{{iso_datetime}}' })}
+
+**Execute immediately without preface.** After search, provide a brief summary addressing the query directly, then structure your response with clear Markdown formatting (## headers, lists, tables). Cite sources properly, tailor tone to query type, and provide comprehensive details.
+
+**CITATION FORMAT - UNICODE ESCAPE SEQUENCES ONLY:**
+Use these EXACT escape sequences (copy verbatim): \\ue202 (before each anchor), \\ue200 (group start), \\ue201 (group end), \\ue203 (highlight start), \\ue204 (highlight end)
+
+Anchor pattern: \\ue202turn{N}{type}{index} where N=turn number, type=search|news|image|ref, index=0,1,2...
+
+**Examples (copy these exactly):**
+- Single: "Statement.\\ue202turn0search0"
+- Multiple: "Statement.\\ue202turn0search0\\ue202turn0news1"
+- Group: "Statement. \\ue200\\ue202turn0search0\\ue202turn0news1\\ue201"
+- Highlight: "\\ue203Cited text.\\ue204\\ue202turn0search0"
+- Image: "See photo\\ue202turn0image0."
+
+**CRITICAL:** Output escape sequences EXACTLY as shown. Do NOT substitute with † or other symbols. Place anchors AFTER punctuation. Cite every non-obvious fact/quote. NEVER use markdown links, [1], footnotes, or HTML tags.`.trim();
+}
diff --git a/packages/api/src/types/anthropic.ts b/packages/api/src/types/anthropic.ts
index 6e9bf7713b..d3ba744488 100644
--- a/packages/api/src/types/anthropic.ts
+++ b/packages/api/src/types/anthropic.ts
@@ -44,6 +44,10 @@ export interface ThinkingConfigEnabled {
   type: 'enabled';
 }
 
+export interface ThinkingConfigAdaptive {
+  type: 'adaptive';
+}
+
 /**
  * Configuration for enabling Claude's extended thinking.
  *
@@ -55,7 +59,10 @@ export interface ThinkingConfigEnabled {
  * [extended thinking](https://docs.anthropic.com/en/docs/build-with-claude/extended-thinking)
  * for details.
  */
-export type ThinkingConfigParam = ThinkingConfigEnabled | ThinkingConfigDisabled;
+export type ThinkingConfigParam =
+  | ThinkingConfigEnabled
+  | ThinkingConfigDisabled
+  | ThinkingConfigAdaptive;
 
 export type AnthropicModelOptions = Partial<Omit<AnthropicParameters, 'thinking'>> & {
   thinking?: AnthropicParameters['thinking'] | null;
diff --git a/packages/api/src/types/bedrock.ts b/packages/api/src/types/bedrock.ts
index 22c8464619..8f34b2864d 100644
--- a/packages/api/src/types/bedrock.ts
+++ b/packages/api/src/types/bedrock.ts
@@ -21,6 +21,13 @@ export interface GuardrailConfiguration {
   trace?: 'enabled' | 'disabled' | 'enabled_full';
 }
 
+/**
+ * AWS Bedrock Inference Profile configuration
+ * Maps model IDs to their inference profile ARNs
+ * @see https://docs.aws.amazon.com/bedrock/latest/userguide/inference-profiles.html
+ */
+export type InferenceProfileConfig = Record<string, string>;
+
 /**
  * Configuration options for Bedrock LLM
  */
@@ -36,6 +43,8 @@ export interface BedrockConfigOptions {
   endpointHost?: string;
   /** Guardrail configuration for content filtering */
   guardrailConfig?: GuardrailConfiguration;
+  /** Inference profile ARNs keyed by model ID / friendly name */
+  inferenceProfiles?: InferenceProfileConfig;
 }
 
 /**
@@ -48,6 +57,7 @@ export interface BedrockLLMConfigResult {
     credentials?: BedrockCredentials;
     endpointHost?: string;
     guardrailConfig?: GuardrailConfiguration;
+    applicationInferenceProfile?: string;
   };
   configOptions: Record<string, unknown>;
 }
diff --git a/packages/api/src/types/http.ts b/packages/api/src/types/http.ts
index 6544447310..c304e9089e 100644
--- a/packages/api/src/types/http.ts
+++ b/packages/api/src/types/http.ts
@@ -1,5 +1,6 @@
-import type { Request } from 'express';
 import type { IUser, AppConfig } from '@librechat/data-schemas';
+import type { TEndpointOption } from 'librechat-data-provider';
+import type { Request } from 'express';
 
 /**
  * LibreChat-specific request body type that extends Express Request body
@@ -11,8 +12,10 @@ export type RequestBody = {
   conversationId?: string;
   parentMessageId?: string;
   endpoint?: string;
+  endpointType?: string;
   model?: string;
   key?: string;
+  endpointOption?: Partial<TEndpointOption>;
 };
 
 export type ServerRequest = Request<unknown, unknown, RequestBody> & {
diff --git a/packages/api/src/utils/env.spec.ts b/packages/api/src/utils/env.spec.ts
index 426afd1970..eec15c1c25 100644
--- a/packages/api/src/utils/env.spec.ts
+++ b/packages/api/src/utils/env.spec.ts
@@ -1,5 +1,10 @@
 import { TokenExchangeMethodEnum } from 'librechat-data-provider';
-import { resolveHeaders, resolveNestedObject, processMCPEnv } from './env';
+import {
+  resolveHeaders,
+  resolveNestedObject,
+  processMCPEnv,
+  encodeHeaderValue,
+} from './env';
 import type { MCPOptions } from 'librechat-data-provider';
 import type { IUser } from '@librechat/data-schemas';
 import { Types } from 'mongoose';
@@ -32,6 +37,83 @@ function createTestUser(overrides: Partial<IUser> = {}): IUser {
   } as IUser;
 }
 
+describe('encodeHeaderValue', () => {
+  it('should return empty string for empty input', () => {
+    expect(encodeHeaderValue('')).toBe('');
+  });
+
+  it('should return empty string for null/undefined coerced to empty string', () => {
+    // TypeScript would prevent these, but testing runtime behavior
+    expect(encodeHeaderValue(null as any)).toBe('');
+    expect(encodeHeaderValue(undefined as any)).toBe('');
+  });
+
+  it('should return empty string for non-string values', () => {
+    expect(encodeHeaderValue(123 as any)).toBe('');
+    expect(encodeHeaderValue(false as any)).toBe('');
+    expect(encodeHeaderValue({} as any)).toBe('');
+  });
+
+  it('should pass through ASCII characters (0-127) unchanged', () => {
+    expect(encodeHeaderValue('Hello')).toBe('Hello');
+    expect(encodeHeaderValue('test@example.com')).toBe('test@example.com');
+    expect(encodeHeaderValue('ABC123')).toBe('ABC123');
+  });
+
+  it('should pass through Latin-1 characters (128-255) unchanged', () => {
+    // Characters with Unicode values 128-255 are safe
+    expect(encodeHeaderValue('José')).toBe('José'); // é = U+00E9 (233)
+    expect(encodeHeaderValue('Müller')).toBe('Müller'); // ü = U+00FC (252)
+    expect(encodeHeaderValue('Zoë')).toBe('Zoë'); // ë = U+00EB (235)
+    expect(encodeHeaderValue('Björk')).toBe('Björk'); // ö = U+00F6 (246)
+  });
+
+  it('should Base64 encode Slavic characters (>255)', () => {
+    // Slavic characters that cause ByteString errors
+    expect(encodeHeaderValue('Marić')).toBe('b64:TWFyacSH'); // ć = U+0107 (263)
+    expect(encodeHeaderValue('Đorđe')).toBe('b64:xJBvcsSRZQ=='); // Đ = U+0110 (272), đ = U+0111 (273)
+  });
+
+  it('should Base64 encode Polish characters (>255)', () => {
+    expect(encodeHeaderValue('Łukasz')).toBe('b64:xYF1a2Fzeg=='); // Ł = U+0141 (321)
+  });
+
+  it('should Base64 encode various extended Unicode characters (>255)', () => {
+    expect(encodeHeaderValue('Žarko')).toBe('b64:xb1hcmtv'); // Ž = U+017D (381)
+    expect(encodeHeaderValue('Šime')).toBe('b64:xaBpbWU='); // Š = U+0160 (352)
+  });
+
+  it('should have correct b64: prefix format', () => {
+    const result = encodeHeaderValue('Ćiro'); // Ć = U+0106 (262)
+    expect(result.startsWith('b64:')).toBe(true);
+    // Verify the encoded part after prefix is valid Base64
+    const base64Part = result.slice(4);
+    expect(Buffer.from(base64Part, 'base64').toString('utf8')).toBe('Ćiro');
+  });
+
+  it('should handle mixed safe and unsafe characters', () => {
+    const result = encodeHeaderValue('Hello Đorđe!');
+    expect(result).toBe('b64:SGVsbG8gxJBvcsSRZSE=');
+  });
+
+  it('should be reversible with Base64 decode', () => {
+    const original = 'Marko Marić';
+    const encoded = encodeHeaderValue(original);
+    expect(encoded.startsWith('b64:')).toBe(true);
+
+    // Verify decoding works
+    const decoded = Buffer.from(encoded.slice(4), 'base64').toString('utf8');
+    expect(decoded).toBe(original);
+  });
+
+  it('should handle emoji and other high Unicode characters', () => {
+    const result = encodeHeaderValue('Hello 👋');
+    expect(result.startsWith('b64:')).toBe(true);
+    const decoded = Buffer.from(result.slice(4), 'base64').toString('utf8');
+    expect(decoded).toBe('Hello 👋');
+  });
+});
+
 describe('resolveHeaders', () => {
   beforeEach(() => {
     process.env.TEST_API_KEY = 'test-api-key-value';
diff --git a/packages/api/src/utils/env.ts b/packages/api/src/utils/env.ts
index c69c57bd22..f4fd2b1c78 100644
--- a/packages/api/src/utils/env.ts
+++ b/packages/api/src/utils/env.ts
@@ -31,6 +31,50 @@ const ALLOWED_USER_FIELDS = [
 type AllowedUserField = (typeof ALLOWED_USER_FIELDS)[number];
 type SafeUser = Pick<IUser, AllowedUserField>;
 
+/**
+ * Encodes a string value to be safe for HTTP headers.
+ * HTTP headers are restricted to ASCII characters (0-255) per the Fetch API standard.
+ * Non-ASCII characters with Unicode values > 255 are Base64 encoded with 'b64:' prefix.
+ *
+ * NOTE: This is a LibreChat-specific encoding scheme to work around Fetch API limitations.
+ * MCP servers receiving headers with the 'b64:' prefix should:
+ * 1. Detect the 'b64:' prefix in header values
+ * 2. Remove the prefix and Base64-decode the remaining string
+ * 3. Use the decoded UTF-8 string as the actual value
+ *
+ * Example decoding (Node.js):
+ *   if (headerValue.startsWith('b64:')) {
+ *     const decoded = Buffer.from(headerValue.slice(4), 'base64').toString('utf8');
+ *   }
+ *
+ * @param value - The string value to encode
+ * @returns ASCII-safe string (encoded if necessary)
+ *
+ * @example
+ * encodeHeaderValue("José")   // Returns "José" (é = 233, safe)
+ * encodeHeaderValue("Marić")  // Returns "b64:TWFyacSH" (ć = 263, needs encoding)
+ */
+export function encodeHeaderValue(value: string): string {
+  // Handle non-string or empty values
+  if (!value || typeof value !== 'string') {
+    return '';
+  }
+
+  // Check if string contains extended Unicode characters (> 255)
+  // Characters 0-255 (ASCII + Latin-1) are safe and don't need encoding
+  // Characters > 255 (e.g., ć=263, đ=272, ł=322) need Base64 encoding
+  // eslint-disable-next-line no-control-regex
+  const hasExtendedUnicode = /[^\u0000-\u00FF]/.test(value);
+
+  if (!hasExtendedUnicode) {
+    return value; // Safe to pass through
+  }
+
+  // Encode to Base64 for extended Unicode characters
+  const base64 = Buffer.from(value, 'utf8').toString('base64');
+  return `b64:${base64}`;
+}
+
 /**
  * Creates a safe user object containing only allowed fields.
  * Preserves federatedTokens for OpenID token template variable resolution.
@@ -66,12 +110,19 @@ export function createSafeUser(
 const ALLOWED_BODY_FIELDS = ['conversationId', 'parentMessageId', 'messageId'] as const;
 
 /**
- * Processes a string value to replace user field placeholders
+ * Processes a string value to replace user field placeholders.
+ * When isHeader is true, non-ASCII characters in certain fields are Base64 encoded.
+ *
  * @param value - The string value to process
  * @param user - The user object
- * @returns The processed string with placeholders replaced
+ * @param isHeader - Whether this value will be used in an HTTP header
+ * @returns The processed string with placeholders replaced (and encoded if necessary)
  */
-function processUserPlaceholders(value: string, user?: IUser): string {
+function processUserPlaceholders(
+  value: string,
+  user?: Partial<IUser>,
+  isHeader: boolean = false,
+): string {
   if (!user || typeof value !== 'string') {
     return value;
   }
@@ -95,7 +146,18 @@ function processUserPlaceholders(value: string, user?: IUser): string {
       continue;
     }
 
-    const replacementValue = fieldValue == null ? '' : String(fieldValue);
+    let replacementValue = fieldValue == null ? '' : String(fieldValue);
+
+    // Encode non-ASCII characters when used in headers
+    // Fields like name, username, email can contain non-ASCII characters
+    // that would cause ByteString conversion errors in the Fetch API
+    if (isHeader) {
+      const fieldsToEncode = ['name', 'username', 'email'];
+      if (fieldsToEncode.includes(field)) {
+        replacementValue = encodeHeaderValue(replacementValue);
+      }
+    }
+
     value = value.replace(new RegExp(placeholder, 'g'), replacementValue);
   }
 
@@ -133,10 +195,12 @@ function processBodyPlaceholders(value: string, body: RequestBody): string {
 
 /**
  * Processes a single string value by replacing various types of placeholders
+ *
  * @param originalValue - The original string value to process
  * @param customUserVars - Optional custom user variables to replace placeholders
  * @param user - Optional user object for replacing user field placeholders
  * @param body - Optional request body object for replacing body field placeholders
+ * @param isHeader - Whether this value will be used in an HTTP header (enables encoding)
  * @returns The processed string with all placeholders replaced
  */
 function processSingleValue({
@@ -144,11 +208,13 @@ function processSingleValue({
   customUserVars,
   user,
   body = undefined,
+  isHeader = false,
 }: {
   originalValue: string;
   customUserVars?: Record<string, string>;
-  user?: IUser;
+  user?: Partial<IUser>;
   body?: RequestBody;
+  isHeader?: boolean;
 }): string {
   // Type guard: ensure we're working with a string
   if (typeof originalValue !== 'string') {
@@ -166,7 +232,7 @@ function processSingleValue({
     }
   }
 
-  value = processUserPlaceholders(value, user);
+  value = processUserPlaceholders(value, user, isHeader);
 
   const openidTokenInfo = extractOpenIDTokenInfo(user);
   if (openidTokenInfo && isOpenIDTokenValid(openidTokenInfo)) {
@@ -193,7 +259,7 @@ function processSingleValue({
  */
 export function processMCPEnv(params: {
   options: Readonly<MCPOptions>;
-  user?: IUser;
+  user?: Partial<IUser>;
   customUserVars?: Record<string, string>;
   body?: RequestBody;
 }): MCPOptions {
@@ -258,7 +324,13 @@ export function processMCPEnv(params: {
   if ('headers' in newObj && newObj.headers) {
     const processedHeaders: Record<string, string> = {};
     for (const [key, originalValue] of Object.entries(newObj.headers)) {
-      processedHeaders[key] = processSingleValue({ originalValue, customUserVars, user, body });
+      processedHeaders[key] = processSingleValue({
+        originalValue,
+        customUserVars,
+        user,
+        body,
+        isHeader: true, // Important: Enable header encoding
+      });
     }
     newObj.headers = processedHeaders;
   }
@@ -356,13 +428,14 @@ export function resolveNestedObject<T = unknown>(options?: {
 
 /**
  * Resolves header values by replacing user placeholders, body variables, custom variables, and environment variables.
+ * Automatically encodes non-ASCII characters for header safety.
  *
- * @param options - Optional configuration object.
- * @param options.headers - The headers object to process.
- * @param options.user - Optional user object for replacing user field placeholders (can be partial with just id).
- * @param options.body - Optional request body object for replacing body field placeholders.
- * @param options.customUserVars - Optional custom user variables to replace placeholders.
- * @returns The processed headers with all placeholders replaced.
+ * @param options - Optional configuration object
+ * @param options.headers - The headers object to process
+ * @param options.user - Optional user object for replacing user field placeholders (can be partial with just id)
+ * @param options.body - Optional request body object for replacing body field placeholders
+ * @param options.customUserVars - Optional custom user variables to replace placeholders
+ * @returns The processed headers with all placeholders replaced
  */
 export function resolveHeaders(options?: {
   headers: Record<string, string> | undefined;
@@ -382,6 +455,7 @@ export function resolveHeaders(options?: {
         customUserVars,
         user: user as IUser,
         body,
+        isHeader: true, // Important: Enable header encoding
       });
     });
   }
diff --git a/packages/api/src/utils/graph.spec.ts b/packages/api/src/utils/graph.spec.ts
new file mode 100644
index 0000000000..4f1fa14983
--- /dev/null
+++ b/packages/api/src/utils/graph.spec.ts
@@ -0,0 +1,467 @@
+import type { TUser } from 'librechat-data-provider';
+import type { GraphTokenResolver, GraphTokenOptions } from './graph';
+import {
+  containsGraphTokenPlaceholder,
+  recordContainsGraphTokenPlaceholder,
+  mcpOptionsContainGraphTokenPlaceholder,
+  resolveGraphTokenPlaceholder,
+  resolveGraphTokensInRecord,
+  preProcessGraphTokens,
+} from './graph';
+
+// Mock the logger
+jest.mock('@librechat/data-schemas', () => ({
+  logger: {
+    warn: jest.fn(),
+    error: jest.fn(),
+  },
+}));
+
+// Mock the oidc module
+jest.mock('./oidc', () => ({
+  GRAPH_TOKEN_PLACEHOLDER: '{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+  DEFAULT_GRAPH_SCOPES: 'https://graph.microsoft.com/.default',
+  extractOpenIDTokenInfo: jest.fn(),
+  isOpenIDTokenValid: jest.fn(),
+}));
+
+import { extractOpenIDTokenInfo, isOpenIDTokenValid } from './oidc';
+
+const mockExtractOpenIDTokenInfo = extractOpenIDTokenInfo as jest.Mock;
+const mockIsOpenIDTokenValid = isOpenIDTokenValid as jest.Mock;
+
+describe('Graph Token Utilities', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('containsGraphTokenPlaceholder', () => {
+    it('should return true when string contains the placeholder', () => {
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      expect(containsGraphTokenPlaceholder(value)).toBe(true);
+    });
+
+    it('should return false when string does not contain the placeholder', () => {
+      const value = 'Bearer some-static-token';
+      expect(containsGraphTokenPlaceholder(value)).toBe(false);
+    });
+
+    it('should return false for empty string', () => {
+      expect(containsGraphTokenPlaceholder('')).toBe(false);
+    });
+
+    it('should return false for non-string values', () => {
+      expect(containsGraphTokenPlaceholder(123 as unknown as string)).toBe(false);
+      expect(containsGraphTokenPlaceholder(null as unknown as string)).toBe(false);
+      expect(containsGraphTokenPlaceholder(undefined as unknown as string)).toBe(false);
+    });
+
+    it('should detect placeholder in the middle of a string', () => {
+      const value = 'prefix-{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}-suffix';
+      expect(containsGraphTokenPlaceholder(value)).toBe(true);
+    });
+  });
+
+  describe('recordContainsGraphTokenPlaceholder', () => {
+    it('should return true when any value contains the placeholder', () => {
+      const record = {
+        Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        'Content-Type': 'application/json',
+      };
+      expect(recordContainsGraphTokenPlaceholder(record)).toBe(true);
+    });
+
+    it('should return false when no value contains the placeholder', () => {
+      const record = {
+        Authorization: 'Bearer static-token',
+        'Content-Type': 'application/json',
+      };
+      expect(recordContainsGraphTokenPlaceholder(record)).toBe(false);
+    });
+
+    it('should return false for undefined record', () => {
+      expect(recordContainsGraphTokenPlaceholder(undefined)).toBe(false);
+    });
+
+    it('should return false for null record', () => {
+      expect(recordContainsGraphTokenPlaceholder(null as unknown as Record<string, string>)).toBe(
+        false,
+      );
+    });
+
+    it('should return false for empty record', () => {
+      expect(recordContainsGraphTokenPlaceholder({})).toBe(false);
+    });
+
+    it('should return false for non-object values', () => {
+      expect(recordContainsGraphTokenPlaceholder('string' as unknown as Record<string, string>)).toBe(
+        false,
+      );
+    });
+  });
+
+  describe('mcpOptionsContainGraphTokenPlaceholder', () => {
+    it('should return true when url contains the placeholder', () => {
+      const options = {
+        url: 'https://api.example.com?token={{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+      };
+      expect(mcpOptionsContainGraphTokenPlaceholder(options)).toBe(true);
+    });
+
+    it('should return true when headers contain the placeholder', () => {
+      const options = {
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        },
+      };
+      expect(mcpOptionsContainGraphTokenPlaceholder(options)).toBe(true);
+    });
+
+    it('should return true when env contains the placeholder', () => {
+      const options = {
+        env: {
+          GRAPH_TOKEN: '{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        },
+      };
+      expect(mcpOptionsContainGraphTokenPlaceholder(options)).toBe(true);
+    });
+
+    it('should return false when no field contains the placeholder', () => {
+      const options = {
+        url: 'https://api.example.com',
+        headers: { Authorization: 'Bearer static-token' },
+        env: { API_KEY: 'some-key' },
+      };
+      expect(mcpOptionsContainGraphTokenPlaceholder(options)).toBe(false);
+    });
+
+    it('should return false for empty options', () => {
+      expect(mcpOptionsContainGraphTokenPlaceholder({})).toBe(false);
+    });
+  });
+
+  describe('resolveGraphTokenPlaceholder', () => {
+    const mockUser: Partial<TUser> = {
+      id: 'user-123',
+      provider: 'openid',
+      openidId: 'oidc-sub-456',
+    };
+
+    const mockGraphTokenResolver: GraphTokenResolver = jest.fn().mockResolvedValue({
+      access_token: 'resolved-graph-token',
+      token_type: 'Bearer',
+      expires_in: 3600,
+      scope: 'https://graph.microsoft.com/.default',
+    });
+
+    it('should return original value when no placeholder is present', async () => {
+      const value = 'Bearer static-token';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+      expect(result).toBe('Bearer static-token');
+    });
+
+    it('should return original value when user is not provided', async () => {
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+      expect(result).toBe(value);
+    });
+
+    it('should return original value when graphTokenResolver is not provided', async () => {
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+      });
+      expect(result).toBe(value);
+    });
+
+    it('should return original value when token info is invalid', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue(null);
+
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+      expect(result).toBe(value);
+    });
+
+    it('should return original value when token is not valid', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(false);
+
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+      expect(result).toBe(value);
+    });
+
+    it('should return original value when access token is missing', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ userId: 'user-123' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+      expect(result).toBe(value);
+    });
+
+    it('should resolve placeholder with graph token', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+      expect(result).toBe('Bearer resolved-graph-token');
+    });
+
+    it('should resolve multiple placeholders in a string', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+
+      const value =
+        'Primary: {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}, Secondary: {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: mockGraphTokenResolver,
+      });
+      expect(result).toBe('Primary: resolved-graph-token, Secondary: resolved-graph-token');
+    });
+
+    it('should return original value when graph token exchange fails', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+      const failingResolver: GraphTokenResolver = jest.fn().mockRejectedValue(new Error('Exchange failed'));
+
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: failingResolver,
+      });
+      expect(result).toBe(value);
+    });
+
+    it('should return original value when graph token response has no access_token', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+      const emptyResolver: GraphTokenResolver = jest.fn().mockResolvedValue({});
+
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      const result = await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: emptyResolver,
+      });
+      expect(result).toBe(value);
+    });
+
+    it('should use provided scopes', async () => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+
+      const value = 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+      await resolveGraphTokenPlaceholder(value, {
+        user: mockUser as TUser,
+        graphTokenResolver: mockGraphTokenResolver,
+        scopes: 'custom-scope',
+      });
+
+      expect(mockGraphTokenResolver).toHaveBeenCalledWith(
+        mockUser,
+        'access-token',
+        'custom-scope',
+        true,
+      );
+    });
+  });
+
+  describe('resolveGraphTokensInRecord', () => {
+    const mockUser: Partial<TUser> = {
+      id: 'user-123',
+      provider: 'openid',
+    };
+
+    const mockGraphTokenResolver: GraphTokenResolver = jest.fn().mockResolvedValue({
+      access_token: 'resolved-graph-token',
+      token_type: 'Bearer',
+      expires_in: 3600,
+      scope: 'https://graph.microsoft.com/.default',
+    });
+
+    const options: GraphTokenOptions = {
+      user: mockUser as TUser,
+      graphTokenResolver: mockGraphTokenResolver,
+    };
+
+    beforeEach(() => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+    });
+
+    it('should return undefined for undefined record', async () => {
+      const result = await resolveGraphTokensInRecord(undefined, options);
+      expect(result).toBeUndefined();
+    });
+
+    it('should return record unchanged when no placeholders present', async () => {
+      const record = {
+        Authorization: 'Bearer static-token',
+        'Content-Type': 'application/json',
+      };
+      const result = await resolveGraphTokensInRecord(record, options);
+      expect(result).toEqual(record);
+    });
+
+    it('should resolve placeholders in record values', async () => {
+      const record = {
+        Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        'Content-Type': 'application/json',
+      };
+      const result = await resolveGraphTokensInRecord(record, options);
+      expect(result).toEqual({
+        Authorization: 'Bearer resolved-graph-token',
+        'Content-Type': 'application/json',
+      });
+    });
+
+    it('should handle non-string values gracefully', async () => {
+      const record = {
+        Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        numericValue: 123 as unknown as string,
+      };
+      const result = await resolveGraphTokensInRecord(record, options);
+      expect(result).toEqual({
+        Authorization: 'Bearer resolved-graph-token',
+        numericValue: 123,
+      });
+    });
+  });
+
+  describe('preProcessGraphTokens', () => {
+    const mockUser: Partial<TUser> = {
+      id: 'user-123',
+      provider: 'openid',
+    };
+
+    const mockGraphTokenResolver: GraphTokenResolver = jest.fn().mockResolvedValue({
+      access_token: 'resolved-graph-token',
+      token_type: 'Bearer',
+      expires_in: 3600,
+      scope: 'https://graph.microsoft.com/.default',
+    });
+
+    const graphOptions: GraphTokenOptions = {
+      user: mockUser as TUser,
+      graphTokenResolver: mockGraphTokenResolver,
+    };
+
+    beforeEach(() => {
+      mockExtractOpenIDTokenInfo.mockReturnValue({ accessToken: 'access-token' });
+      mockIsOpenIDTokenValid.mockReturnValue(true);
+    });
+
+    it('should return options unchanged when no placeholders present', async () => {
+      const options = {
+        url: 'https://api.example.com',
+        headers: { Authorization: 'Bearer static-token' },
+        env: { API_KEY: 'some-key' },
+      };
+      const result = await preProcessGraphTokens(options, graphOptions);
+      expect(result).toEqual(options);
+    });
+
+    it('should resolve placeholder in url', async () => {
+      const options = {
+        url: 'https://api.example.com?token={{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+      };
+      const result = await preProcessGraphTokens(options, graphOptions);
+      expect(result.url).toBe('https://api.example.com?token=resolved-graph-token');
+    });
+
+    it('should resolve placeholder in headers', async () => {
+      const options = {
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          'Content-Type': 'application/json',
+        },
+      };
+      const result = await preProcessGraphTokens(options, graphOptions);
+      expect(result.headers).toEqual({
+        Authorization: 'Bearer resolved-graph-token',
+        'Content-Type': 'application/json',
+      });
+    });
+
+    it('should resolve placeholder in env', async () => {
+      const options = {
+        env: {
+          GRAPH_TOKEN: '{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+          OTHER_VAR: 'static-value',
+        },
+      };
+      const result = await preProcessGraphTokens(options, graphOptions);
+      expect(result.env).toEqual({
+        GRAPH_TOKEN: 'resolved-graph-token',
+        OTHER_VAR: 'static-value',
+      });
+    });
+
+    it('should resolve placeholders in all fields simultaneously', async () => {
+      const options = {
+        url: 'https://api.example.com?token={{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        },
+        env: {
+          GRAPH_TOKEN: '{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        },
+      };
+      const result = await preProcessGraphTokens(options, graphOptions);
+      expect(result.url).toBe('https://api.example.com?token=resolved-graph-token');
+      expect(result.headers).toEqual({
+        Authorization: 'Bearer resolved-graph-token',
+      });
+      expect(result.env).toEqual({
+        GRAPH_TOKEN: 'resolved-graph-token',
+      });
+    });
+
+    it('should not mutate the original options object', async () => {
+      const options = {
+        url: 'https://api.example.com?token={{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        headers: {
+          Authorization: 'Bearer {{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        },
+      };
+      const originalUrl = options.url;
+      const originalAuth = options.headers.Authorization;
+
+      await preProcessGraphTokens(options, graphOptions);
+
+      expect(options.url).toBe(originalUrl);
+      expect(options.headers.Authorization).toBe(originalAuth);
+    });
+
+    it('should preserve additional properties in generic type', async () => {
+      const options = {
+        url: 'https://api.example.com?token={{LIBRECHAT_GRAPH_ACCESS_TOKEN}}',
+        customProperty: 'custom-value',
+        anotherProperty: 42,
+      };
+      const result = await preProcessGraphTokens(options, graphOptions);
+      expect(result.customProperty).toBe('custom-value');
+      expect(result.anotherProperty).toBe(42);
+      expect(result.url).toBe('https://api.example.com?token=resolved-graph-token');
+    });
+  });
+});
diff --git a/packages/api/src/utils/graph.ts b/packages/api/src/utils/graph.ts
new file mode 100644
index 0000000000..0ff3fc3583
--- /dev/null
+++ b/packages/api/src/utils/graph.ts
@@ -0,0 +1,215 @@
+import { logger } from '@librechat/data-schemas';
+import type { IUser } from '@librechat/data-schemas';
+import {
+  GRAPH_TOKEN_PLACEHOLDER,
+  DEFAULT_GRAPH_SCOPES,
+  extractOpenIDTokenInfo,
+  isOpenIDTokenValid,
+} from './oidc';
+
+/**
+ * Pre-computed regex for matching the Graph token placeholder.
+ * Escapes curly braces in the placeholder string for safe regex use.
+ */
+const GRAPH_TOKEN_REGEX = new RegExp(
+  GRAPH_TOKEN_PLACEHOLDER.replace(/[{}]/g, '\\$&'),
+  'g',
+);
+
+/**
+ * Response from a Graph API token exchange.
+ */
+export interface GraphTokenResponse {
+  access_token: string;
+  token_type: string;
+  expires_in: number;
+  scope: string;
+}
+
+/**
+ * Function type for resolving Graph API tokens via OBO flow.
+ * This function is injected from the main API layer since it requires
+ * access to OpenID configuration and caching services.
+ */
+export type GraphTokenResolver = (
+  user: IUser,
+  accessToken: string,
+  scopes: string,
+  fromCache?: boolean,
+) => Promise<GraphTokenResponse>;
+
+/**
+ * Options for processing Graph token placeholders.
+ */
+export interface GraphTokenOptions {
+  user?: IUser;
+  graphTokenResolver?: GraphTokenResolver;
+  scopes?: string;
+}
+
+/**
+ * Checks if a string contains the Graph token placeholder.
+ * @param value - The string to check
+ * @returns True if the placeholder is present
+ */
+export function containsGraphTokenPlaceholder(value: string): boolean {
+  return typeof value === 'string' && value.includes(GRAPH_TOKEN_PLACEHOLDER);
+}
+
+/**
+ * Checks if any value in a record contains the Graph token placeholder.
+ * @param record - The record to check (e.g., headers, env vars)
+ * @returns True if any value contains the placeholder
+ */
+export function recordContainsGraphTokenPlaceholder(
+  record: Record<string, string> | undefined,
+): boolean {
+  if (!record || typeof record !== 'object') {
+    return false;
+  }
+  return Object.values(record).some(containsGraphTokenPlaceholder);
+}
+
+/**
+ * Checks if MCP options contain the Graph token placeholder in headers, env, or url.
+ * @param options - The MCP options object
+ * @returns True if any field contains the placeholder
+ */
+export function mcpOptionsContainGraphTokenPlaceholder(options: {
+  headers?: Record<string, string>;
+  env?: Record<string, string>;
+  url?: string;
+}): boolean {
+  if (options.url && containsGraphTokenPlaceholder(options.url)) {
+    return true;
+  }
+  if (recordContainsGraphTokenPlaceholder(options.headers)) {
+    return true;
+  }
+  if (recordContainsGraphTokenPlaceholder(options.env)) {
+    return true;
+  }
+  return false;
+}
+
+/**
+ * Asynchronously resolves Graph token placeholders in a string.
+ * This function must be called before the synchronous processMCPEnv pipeline.
+ *
+ * @param value - The string containing the placeholder
+ * @param options - Options including user and graph token resolver
+ * @returns The string with Graph token placeholder replaced
+ */
+export async function resolveGraphTokenPlaceholder(
+  value: string,
+  options: GraphTokenOptions,
+): Promise<string> {
+  if (!containsGraphTokenPlaceholder(value)) {
+    return value;
+  }
+
+  const { user, graphTokenResolver, scopes } = options;
+
+  if (!user || !graphTokenResolver) {
+    logger.warn(
+      '[resolveGraphTokenPlaceholder] User or graphTokenResolver not provided, cannot resolve Graph token',
+    );
+    return value;
+  }
+
+  const tokenInfo = extractOpenIDTokenInfo(user);
+  if (!tokenInfo || !isOpenIDTokenValid(tokenInfo)) {
+    logger.warn(
+      '[resolveGraphTokenPlaceholder] No valid OpenID token available for Graph token exchange',
+    );
+    return value;
+  }
+
+  if (!tokenInfo.accessToken) {
+    logger.warn('[resolveGraphTokenPlaceholder] No access token available for OBO exchange');
+    return value;
+  }
+
+  try {
+    const graphScopes = scopes || process.env.GRAPH_API_SCOPES || DEFAULT_GRAPH_SCOPES;
+    const graphTokenResponse = await graphTokenResolver(
+      user,
+      tokenInfo.accessToken,
+      graphScopes,
+      true, // Use cache
+    );
+
+    if (graphTokenResponse?.access_token) {
+      return value.replace(GRAPH_TOKEN_REGEX, graphTokenResponse.access_token);
+    }
+
+    logger.warn('[resolveGraphTokenPlaceholder] Graph token exchange did not return an access token');
+    return value;
+  } catch (error) {
+    logger.error('[resolveGraphTokenPlaceholder] Failed to exchange token for Graph API:', error);
+    return value;
+  }
+}
+
+/**
+ * Asynchronously resolves Graph token placeholders in a record of string values.
+ *
+ * @param record - The record containing placeholders (e.g., headers)
+ * @param options - Options including user and graph token resolver
+ * @returns The record with Graph token placeholders replaced
+ */
+export async function resolveGraphTokensInRecord(
+  record: Record<string, string> | undefined,
+  options: GraphTokenOptions,
+): Promise<Record<string, string> | undefined> {
+  if (!record || typeof record !== 'object') {
+    return record;
+  }
+
+  if (!recordContainsGraphTokenPlaceholder(record)) {
+    return record;
+  }
+
+  const resolved: Record<string, string> = {};
+  for (const [key, value] of Object.entries(record)) {
+    resolved[key] = await resolveGraphTokenPlaceholder(value, options);
+  }
+  return resolved;
+}
+
+/**
+ * Pre-processes MCP options to resolve Graph token placeholders.
+ * This must be called before processMCPEnv since Graph token resolution is async.
+ *
+ * @param options - The MCP options object
+ * @param graphOptions - Options for Graph token resolution
+ * @returns The options with Graph token placeholders resolved
+ */
+export async function preProcessGraphTokens<T extends {
+  headers?: Record<string, string>;
+  env?: Record<string, string>;
+  url?: string;
+}>(
+  options: T,
+  graphOptions: GraphTokenOptions,
+): Promise<T> {
+  if (!mcpOptionsContainGraphTokenPlaceholder(options)) {
+    return options;
+  }
+
+  const result = { ...options };
+
+  if (result.url && containsGraphTokenPlaceholder(result.url)) {
+    result.url = await resolveGraphTokenPlaceholder(result.url, graphOptions);
+  }
+
+  if (result.headers) {
+    result.headers = await resolveGraphTokensInRecord(result.headers, graphOptions);
+  }
+
+  if (result.env) {
+    result.env = await resolveGraphTokensInRecord(result.env, graphOptions);
+  }
+
+  return result;
+}
diff --git a/packages/api/src/utils/index.ts b/packages/api/src/utils/index.ts
index 947e566ce0..d4351eb5a0 100644
--- a/packages/api/src/utils/index.ts
+++ b/packages/api/src/utils/index.ts
@@ -7,11 +7,13 @@ export * from './env';
 export * from './events';
 export * from './files';
 export * from './generators';
+export * from './graph';
 export * from './path';
 export * from './key';
 export * from './latex';
 export * from './llm';
 export * from './math';
+export * from './oidc';
 export * from './openid';
 export * from './promise';
 export * from './sanitizeTitle';
diff --git a/packages/api/src/utils/message.spec.ts b/packages/api/src/utils/message.spec.ts
index 144ebc1a92..ba626c83fd 100644
--- a/packages/api/src/utils/message.spec.ts
+++ b/packages/api/src/utils/message.spec.ts
@@ -1,4 +1,8 @@
-import { sanitizeFileForTransmit, sanitizeMessageForTransmit } from './message';
+import { Constants } from 'librechat-data-provider';
+import { sanitizeFileForTransmit, sanitizeMessageForTransmit, getThreadData } from './message';
+
+/** Cast to string for type compatibility with ThreadMessage */
+const NO_PARENT = Constants.NO_PARENT as string;
 
 describe('sanitizeFileForTransmit', () => {
   it('should remove text field from file', () => {
@@ -120,3 +124,272 @@ describe('sanitizeMessageForTransmit', () => {
     expect(message.files[0].text).toBe('original text');
   });
 });
+
+describe('getThreadData', () => {
+  describe('edge cases - empty and null inputs', () => {
+    it('should return empty result for empty messages array', () => {
+      const result = getThreadData([], 'parent-123');
+
+      expect(result.messageIds).toEqual([]);
+      expect(result.fileIds).toEqual([]);
+    });
+
+    it('should return empty result for null parentMessageId', () => {
+      const messages = [
+        { messageId: 'msg-1', parentMessageId: null },
+        { messageId: 'msg-2', parentMessageId: 'msg-1' },
+      ];
+
+      const result = getThreadData(messages, null);
+
+      expect(result.messageIds).toEqual([]);
+      expect(result.fileIds).toEqual([]);
+    });
+
+    it('should return empty result for undefined parentMessageId', () => {
+      const messages = [{ messageId: 'msg-1', parentMessageId: null }];
+
+      const result = getThreadData(messages, undefined);
+
+      expect(result.messageIds).toEqual([]);
+      expect(result.fileIds).toEqual([]);
+    });
+
+    it('should return empty result when parentMessageId not found in messages', () => {
+      const messages = [
+        { messageId: 'msg-1', parentMessageId: null },
+        { messageId: 'msg-2', parentMessageId: 'msg-1' },
+      ];
+
+      const result = getThreadData(messages, 'non-existent');
+
+      expect(result.messageIds).toEqual([]);
+      expect(result.fileIds).toEqual([]);
+    });
+  });
+
+  describe('thread traversal', () => {
+    it('should traverse a simple linear thread', () => {
+      const messages = [
+        { messageId: 'msg-1', parentMessageId: NO_PARENT },
+        { messageId: 'msg-2', parentMessageId: 'msg-1' },
+        { messageId: 'msg-3', parentMessageId: 'msg-2' },
+      ];
+
+      const result = getThreadData(messages, 'msg-3');
+
+      expect(result.messageIds).toEqual(['msg-3', 'msg-2', 'msg-1']);
+      expect(result.fileIds).toEqual([]);
+    });
+
+    it('should stop at NO_PARENT constant', () => {
+      const messages = [
+        { messageId: 'msg-1', parentMessageId: NO_PARENT },
+        { messageId: 'msg-2', parentMessageId: 'msg-1' },
+      ];
+
+      const result = getThreadData(messages, 'msg-2');
+
+      expect(result.messageIds).toEqual(['msg-2', 'msg-1']);
+    });
+
+    it('should collect only messages in the thread branch', () => {
+      // Branched conversation: msg-1 -> msg-2 -> msg-3 (branch A)
+      //                       msg-1 -> msg-4 -> msg-5 (branch B)
+      const messages = [
+        { messageId: 'msg-1', parentMessageId: NO_PARENT },
+        { messageId: 'msg-2', parentMessageId: 'msg-1' },
+        { messageId: 'msg-3', parentMessageId: 'msg-2' },
+        { messageId: 'msg-4', parentMessageId: 'msg-1' },
+        { messageId: 'msg-5', parentMessageId: 'msg-4' },
+      ];
+
+      const resultBranchA = getThreadData(messages, 'msg-3');
+      expect(resultBranchA.messageIds).toEqual(['msg-3', 'msg-2', 'msg-1']);
+
+      const resultBranchB = getThreadData(messages, 'msg-5');
+      expect(resultBranchB.messageIds).toEqual(['msg-5', 'msg-4', 'msg-1']);
+    });
+
+    it('should handle single message thread', () => {
+      const messages = [{ messageId: 'msg-1', parentMessageId: NO_PARENT }];
+
+      const result = getThreadData(messages, 'msg-1');
+
+      expect(result.messageIds).toEqual(['msg-1']);
+      expect(result.fileIds).toEqual([]);
+    });
+  });
+
+  describe('circular reference protection', () => {
+    it('should handle circular references without infinite loop', () => {
+      // Malformed data: msg-2 points to msg-3 which points back to msg-2
+      const messages = [
+        { messageId: 'msg-1', parentMessageId: NO_PARENT },
+        { messageId: 'msg-2', parentMessageId: 'msg-3' },
+        { messageId: 'msg-3', parentMessageId: 'msg-2' },
+      ];
+
+      const result = getThreadData(messages, 'msg-2');
+
+      // Should stop when encountering a visited ID
+      expect(result.messageIds).toEqual(['msg-2', 'msg-3']);
+      expect(result.fileIds).toEqual([]);
+    });
+
+    it('should handle self-referencing message', () => {
+      const messages = [{ messageId: 'msg-1', parentMessageId: 'msg-1' }];
+
+      const result = getThreadData(messages, 'msg-1');
+
+      expect(result.messageIds).toEqual(['msg-1']);
+    });
+  });
+
+  describe('file ID collection', () => {
+    it('should collect file IDs from messages with files', () => {
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: NO_PARENT,
+          files: [{ file_id: 'file-1' }, { file_id: 'file-2' }],
+        },
+        {
+          messageId: 'msg-2',
+          parentMessageId: 'msg-1',
+          files: [{ file_id: 'file-3' }],
+        },
+      ];
+
+      const result = getThreadData(messages, 'msg-2');
+
+      expect(result.messageIds).toEqual(['msg-2', 'msg-1']);
+      expect(result.fileIds).toContain('file-1');
+      expect(result.fileIds).toContain('file-2');
+      expect(result.fileIds).toContain('file-3');
+      expect(result.fileIds).toHaveLength(3);
+    });
+
+    it('should deduplicate file IDs across messages', () => {
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: NO_PARENT,
+          files: [{ file_id: 'file-shared' }, { file_id: 'file-1' }],
+        },
+        {
+          messageId: 'msg-2',
+          parentMessageId: 'msg-1',
+          files: [{ file_id: 'file-shared' }, { file_id: 'file-2' }],
+        },
+      ];
+
+      const result = getThreadData(messages, 'msg-2');
+
+      expect(result.fileIds).toContain('file-shared');
+      expect(result.fileIds).toContain('file-1');
+      expect(result.fileIds).toContain('file-2');
+      expect(result.fileIds).toHaveLength(3);
+    });
+
+    it('should skip files without file_id', () => {
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: NO_PARENT,
+          files: [{ file_id: 'file-1' }, { file_id: undefined }, { file_id: '' }],
+        },
+      ];
+
+      const result = getThreadData(messages, 'msg-1');
+
+      expect(result.fileIds).toEqual(['file-1']);
+    });
+
+    it('should handle messages with empty files array', () => {
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: NO_PARENT,
+          files: [],
+        },
+        {
+          messageId: 'msg-2',
+          parentMessageId: 'msg-1',
+          files: [{ file_id: 'file-1' }],
+        },
+      ];
+
+      const result = getThreadData(messages, 'msg-2');
+
+      expect(result.messageIds).toEqual(['msg-2', 'msg-1']);
+      expect(result.fileIds).toEqual(['file-1']);
+    });
+
+    it('should handle messages without files property', () => {
+      const messages = [
+        { messageId: 'msg-1', parentMessageId: NO_PARENT },
+        {
+          messageId: 'msg-2',
+          parentMessageId: 'msg-1',
+          files: [{ file_id: 'file-1' }],
+        },
+      ];
+
+      const result = getThreadData(messages, 'msg-2');
+
+      expect(result.messageIds).toEqual(['msg-2', 'msg-1']);
+      expect(result.fileIds).toEqual(['file-1']);
+    });
+
+    it('should only collect files from messages in the thread', () => {
+      // msg-3 is not in the thread from msg-2
+      const messages = [
+        {
+          messageId: 'msg-1',
+          parentMessageId: NO_PARENT,
+          files: [{ file_id: 'file-1' }],
+        },
+        {
+          messageId: 'msg-2',
+          parentMessageId: 'msg-1',
+          files: [{ file_id: 'file-2' }],
+        },
+        {
+          messageId: 'msg-3',
+          parentMessageId: 'msg-1',
+          files: [{ file_id: 'file-3' }],
+        },
+      ];
+
+      const result = getThreadData(messages, 'msg-2');
+
+      expect(result.fileIds).toContain('file-1');
+      expect(result.fileIds).toContain('file-2');
+      expect(result.fileIds).not.toContain('file-3');
+    });
+  });
+
+  describe('performance - O(1) lookups', () => {
+    it('should handle large message arrays efficiently', () => {
+      // Create a linear thread of 1000 messages
+      const messages = [];
+      for (let i = 0; i < 1000; i++) {
+        messages.push({
+          messageId: `msg-${i}`,
+          parentMessageId: i === 0 ? NO_PARENT : `msg-${i - 1}`,
+          files: [{ file_id: `file-${i}` }],
+        });
+      }
+
+      const startTime = performance.now();
+      const result = getThreadData(messages, 'msg-999');
+      const endTime = performance.now();
+
+      expect(result.messageIds).toHaveLength(1000);
+      expect(result.fileIds).toHaveLength(1000);
+      // Should complete in reasonable time (< 100ms for 1000 messages)
+      expect(endTime - startTime).toBeLessThan(100);
+    });
+  });
+});
diff --git a/packages/api/src/utils/message.ts b/packages/api/src/utils/message.ts
index 312826b6ba..b1e939c6d7 100644
--- a/packages/api/src/utils/message.ts
+++ b/packages/api/src/utils/message.ts
@@ -1,3 +1,4 @@
+import { Constants } from 'librechat-data-provider';
 import type { TFile, TMessage } from 'librechat-data-provider';
 
 /** Fields to strip from files before client transmission */
@@ -66,3 +67,74 @@ export function sanitizeMessageForTransmit<T extends Partial<TMessage>>(
 
   return sanitized;
 }
+
+/** Minimal message shape for thread traversal */
+type ThreadMessage = {
+  messageId: string;
+  parentMessageId?: string | null;
+  files?: Array<{ file_id?: string }>;
+};
+
+/** Result of thread data extraction */
+export type ThreadData = {
+  messageIds: string[];
+  fileIds: string[];
+};
+
+/**
+ * Extracts thread message IDs and file IDs in a single O(n) pass.
+ * Builds a Map for O(1) lookups, then traverses the thread collecting both IDs.
+ *
+ * @param messages - All messages in the conversation (should be queried with select for efficiency)
+ * @param parentMessageId - The ID of the parent message to start traversal from
+ * @returns Object containing messageIds and fileIds arrays
+ */
+export function getThreadData(
+  messages: ThreadMessage[],
+  parentMessageId: string | null | undefined,
+): ThreadData {
+  const result: ThreadData = { messageIds: [], fileIds: [] };
+
+  if (!messages || messages.length === 0 || !parentMessageId) {
+    return result;
+  }
+
+  /** Build Map for O(1) lookups instead of O(n) .find() calls */
+  const messageMap = new Map<string, ThreadMessage>();
+  for (const msg of messages) {
+    messageMap.set(msg.messageId, msg);
+  }
+
+  const fileIdSet = new Set<string>();
+  const visitedIds = new Set<string>();
+  let currentId: string | null | undefined = parentMessageId;
+
+  /** Single traversal: collect message IDs and file IDs together */
+  while (currentId) {
+    if (visitedIds.has(currentId)) {
+      break;
+    }
+    visitedIds.add(currentId);
+
+    const message = messageMap.get(currentId);
+    if (!message) {
+      break;
+    }
+
+    result.messageIds.push(message.messageId);
+
+    /** Collect file IDs from this message */
+    if (message.files) {
+      for (const file of message.files) {
+        if (file.file_id) {
+          fileIdSet.add(file.file_id);
+        }
+      }
+    }
+
+    currentId = message.parentMessageId === Constants.NO_PARENT ? null : message.parentMessageId;
+  }
+
+  result.fileIds = Array.from(fileIdSet);
+  return result;
+}
diff --git a/packages/api/src/utils/oidc.spec.ts b/packages/api/src/utils/oidc.spec.ts
index a5312e9c69..0d7216304b 100644
--- a/packages/api/src/utils/oidc.spec.ts
+++ b/packages/api/src/utils/oidc.spec.ts
@@ -427,6 +427,35 @@ describe('OpenID Token Utilities', () => {
       expect(result).toContain('User:');
     });
 
+    it('should resolve LIBRECHAT_OPENID_ID_TOKEN and LIBRECHAT_OPENID_ACCESS_TOKEN to different values', () => {
+      const user: Partial<TUser> = {
+        id: 'user-123',
+        provider: 'openid',
+        openidId: 'oidc-sub-456',
+        email: 'test@example.com',
+        name: 'Test User',
+        federatedTokens: {
+          access_token: 'my-access-token',
+          id_token: 'my-id-token',
+          refresh_token: 'my-refresh-token',
+          expires_at: Math.floor(Date.now() / 1000) + 3600,
+        },
+      };
+
+      const tokenInfo = extractOpenIDTokenInfo(user);
+      expect(tokenInfo).not.toBeNull();
+      expect(tokenInfo!.accessToken).toBe('my-access-token');
+      expect(tokenInfo!.idToken).toBe('my-id-token');
+      expect(tokenInfo!.accessToken).not.toBe(tokenInfo!.idToken);
+
+      const input = 'ACCESS={{LIBRECHAT_OPENID_ACCESS_TOKEN}}, ID={{LIBRECHAT_OPENID_ID_TOKEN}}';
+      const result = processOpenIDPlaceholders(input, tokenInfo!);
+
+      expect(result).toBe('ACCESS=my-access-token, ID=my-id-token');
+      // Verify they are not the same value (the reported bug)
+      expect(result).not.toBe('ACCESS=my-access-token, ID=my-access-token');
+    });
+
     it('should handle expired tokens correctly', () => {
       const user: Partial<TUser> = {
         id: 'user-123',
diff --git a/packages/api/src/utils/oidc.ts b/packages/api/src/utils/oidc.ts
index cebda91e69..dbf41818c4 100644
--- a/packages/api/src/utils/oidc.ts
+++ b/packages/api/src/utils/oidc.ts
@@ -34,7 +34,22 @@ const OPENID_TOKEN_FIELDS = [
   'EXPIRES_AT',
 ] as const;
 
-export function extractOpenIDTokenInfo(user: IUser | null | undefined): OpenIDTokenInfo | null {
+/**
+ * Placeholder for Microsoft Graph API access token.
+ * This placeholder is resolved asynchronously via OBO (On-Behalf-Of) flow
+ * and requires special handling outside the synchronous processMCPEnv pipeline.
+ */
+export const GRAPH_TOKEN_PLACEHOLDER = '{{LIBRECHAT_GRAPH_ACCESS_TOKEN}}';
+
+/**
+ * Default Microsoft Graph API scopes for OBO token exchange.
+ * Can be overridden via GRAPH_API_SCOPES environment variable.
+ */
+export const DEFAULT_GRAPH_SCOPES = 'https://graph.microsoft.com/.default';
+
+export function extractOpenIDTokenInfo(
+  user: Partial<IUser> | null | undefined,
+): OpenIDTokenInfo | null {
   if (!user) {
     return null;
   }
diff --git a/packages/api/src/utils/tokens.ts b/packages/api/src/utils/tokens.ts
index 750a2c9244..a824afa489 100644
--- a/packages/api/src/utils/tokens.ts
+++ b/packages/api/src/utils/tokens.ts
@@ -2,6 +2,34 @@ import z from 'zod';
 import { EModelEndpoint } from 'librechat-data-provider';
 import type { EndpointTokenConfig, TokenConfig } from '~/types';
 
+/**
+ * Model Token Configuration Maps
+ *
+ * IMPORTANT: Key Ordering for Pattern Matching
+ * ============================================
+ * The `findMatchingPattern` function iterates through object keys in REVERSE order
+ * (last-defined keys are checked first) and uses `modelName.includes(key)` for matching.
+ *
+ * This means:
+ * 1. BASE PATTERNS must be defined FIRST (e.g., "kimi", "moonshot")
+ * 2. SPECIFIC PATTERNS must be defined AFTER their base patterns (e.g., "kimi-k2", "kimi-k2.5")
+ *
+ * Example ordering for Kimi models:
+ *   kimi: 262144,           // Base pattern - checked last
+ *   'kimi-k2': 262144,      // More specific - checked before "kimi"
+ *   'kimi-k2.5': 262144,    // Most specific - checked first
+ *
+ * Why this matters:
+ * - Model name "kimi-k2.5" contains both "kimi" and "kimi-k2" as substrings
+ * - If "kimi" were checked first, it would incorrectly match "kimi-k2.5"
+ * - By defining specific patterns AFTER base patterns, they're checked first in reverse iteration
+ *
+ * When adding new model families:
+ * 1. Define the base/generic pattern first
+ * 2. Define increasingly specific patterns after
+ * 3. Ensure no pattern is a substring of another that should match differently
+ */
+
 const openAIModels = {
   'o4-mini': 200000,
   'o3-mini': 195000, // -5000 from max
@@ -120,9 +148,11 @@ const anthropicModels = {
   'claude-3.5-sonnet-latest': 200000,
   'claude-haiku-4-5': 200000,
   'claude-sonnet-4': 1000000,
+  'claude-sonnet-4-6': 1000000,
   'claude-4': 200000,
   'claude-opus-4': 200000,
   'claude-opus-4-5': 200000,
+  'claude-opus-4-6': 1000000,
 };
 
 const deepseekModels = {
@@ -134,6 +164,44 @@ const deepseekModels = {
   'deepseek.r1': 128000,
 };
 
+const moonshotModels = {
+  // Base patterns (check last due to reverse iteration)
+  kimi: 262144,
+  moonshot: 131072,
+  // kimi-k2 series (specific patterns)
+  'kimi-latest': 128000,
+  'kimi-k2': 262144,
+  'kimi-k2.5': 262144,
+  'kimi-k2-turbo': 262144,
+  'kimi-k2-turbo-preview': 262144,
+  'kimi-k2-0905': 262144,
+  'kimi-k2-0905-preview': 262144,
+  'kimi-k2-0711': 131072,
+  'kimi-k2-0711-preview': 131072,
+  'kimi-k2-thinking': 262144,
+  'kimi-k2-thinking-turbo': 262144,
+  // moonshot-v1 series (specific patterns)
+  'moonshot-v1': 131072,
+  'moonshot-v1-auto': 131072,
+  'moonshot-v1-8k': 8192,
+  'moonshot-v1-8k-vision': 8192,
+  'moonshot-v1-8k-vision-preview': 8192,
+  'moonshot-v1-32k': 32768,
+  'moonshot-v1-32k-vision': 32768,
+  'moonshot-v1-32k-vision-preview': 32768,
+  'moonshot-v1-128k': 131072,
+  'moonshot-v1-128k-vision': 131072,
+  'moonshot-v1-128k-vision-preview': 131072,
+  // Bedrock moonshot models
+  'moonshot.kimi': 262144,
+  'moonshot.kimi-k2': 262144,
+  'moonshot.kimi-k2.5': 262144,
+  'moonshot.kimi-k2-thinking': 262144,
+  'moonshot.kimi-k2-0711': 131072,
+  'moonshotai.kimi': 262144,
+  'moonshotai.kimi-k2.5': 262144,
+};
+
 const metaModels = {
   // Basic patterns
   llama3: 8000,
@@ -243,14 +311,21 @@ const amazonModels = {
   'nova-premier': 995000, // -5000 from max
 };
 
+const openAIBedrockModels = {
+  'openai.gpt-oss-20b': 128000,
+  'openai.gpt-oss-120b': 128000,
+};
+
 const bedrockModels = {
   ...anthropicModels,
   ...mistralModels,
   ...cohereModels,
   ...deepseekModels,
+  ...moonshotModels,
   ...metaModels,
   ...ai21Models,
   ...amazonModels,
+  ...openAIBedrockModels,
 };
 
 const xAIModels = {
@@ -279,8 +354,6 @@ const aggregateModels = {
   ...bedrockModels,
   ...xAIModels,
   ...qwenModels,
-  // misc.
-  kimi: 131000,
   // GPT-OSS
   'gpt-oss': 131000,
   'gpt-oss:20b': 131000,
@@ -329,8 +402,10 @@ const anthropicMaxOutputs = {
   'claude-3-opus': 4096,
   'claude-haiku-4-5': 64000,
   'claude-sonnet-4': 64000,
+  'claude-sonnet-4-6': 64000,
   'claude-opus-4': 32000,
   'claude-opus-4-5': 64000,
+  'claude-opus-4-6': 128000,
   'claude-3.5-sonnet': 8192,
   'claude-3-5-sonnet': 8192,
   'claude-3.7-sonnet': 128000,
diff --git a/packages/client/package.json b/packages/client/package.json
index 9835f62ebc..faf325f88d 100644
--- a/packages/client/package.json
+++ b/packages/client/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@librechat/client",
-  "version": "0.4.4",
+  "version": "0.4.51",
   "description": "React components for LibreChat",
   "repository": {
     "type": "git",
diff --git a/packages/client/src/common/menus.ts b/packages/client/src/common/menus.ts
index 9d6c2174c7..99f98c1a49 100644
--- a/packages/client/src/common/menus.ts
+++ b/packages/client/src/common/menus.ts
@@ -27,6 +27,8 @@ export interface MenuItemProps {
     | 'grid'
     | undefined;
   ariaControls?: string;
+  ariaLabel?: string;
+  ariaChecked?: boolean;
   ref?: React.Ref<any>;
   className?: string;
   render?:
diff --git a/packages/client/src/components/DropdownMenu.tsx b/packages/client/src/components/DropdownMenu.tsx
index 488ab18f6e..013301bc6a 100644
--- a/packages/client/src/components/DropdownMenu.tsx
+++ b/packages/client/src/components/DropdownMenu.tsx
@@ -30,7 +30,7 @@ function DropdownMenuContent({
         data-slot="dropdown-menu-content"
         sideOffset={sideOffset}
         className={cn(
-          'text-popover-foreground max-h-(--radix-dropdown-menu-content-available-height) origin-(--radix-dropdown-menu-content-transform-origin) z-40 min-w-[8rem] overflow-y-auto overflow-x-hidden rounded-md border border-border-light bg-surface-secondary p-1 shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
+          'max-h-(--radix-dropdown-menu-content-available-height) origin-(--radix-dropdown-menu-content-transform-origin) z-40 min-w-[8rem] overflow-y-auto overflow-x-hidden rounded-md border border-border-medium bg-surface-primary p-1 text-text-primary shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
           className,
         )}
         {...props}
@@ -198,7 +198,7 @@ function DropdownMenuSubContent({
     <DropdownMenuPrimitive.SubContent
       data-slot="dropdown-menu-sub-content"
       className={cn(
-        'text-popover-foreground origin-(--radix-dropdown-menu-content-transform-origin) z-40 min-w-[8rem] overflow-hidden rounded-md border border-border-medium bg-surface-secondary p-1 shadow-lg data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
+        'origin-(--radix-dropdown-menu-content-transform-origin) z-40 min-w-[8rem] overflow-hidden rounded-md border border-border-medium bg-surface-primary p-1 text-text-primary shadow-lg data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
         className,
       )}
       {...props}
diff --git a/packages/client/src/components/DropdownPopup.tsx b/packages/client/src/components/DropdownPopup.tsx
index 7ba018f441..fa628ce89f 100644
--- a/packages/client/src/components/DropdownPopup.tsx
+++ b/packages/client/src/components/DropdownPopup.tsx
@@ -148,6 +148,9 @@ const Menu: React.FC<MenuProps> = ({
               hideOnClick={item.hideOnClick}
               aria-haspopup={item.ariaHasPopup}
               aria-controls={item.ariaControls}
+              aria-label={item.ariaLabel}
+              aria-checked={item.ariaChecked}
+              {...(item.ariaChecked !== undefined ? { role: 'menuitemcheckbox' } : {})}
               onClick={(event) => {
                 event.preventDefault();
                 if (item.onClick) {
diff --git a/packages/client/src/components/OGDialogTemplate.tsx b/packages/client/src/components/OGDialogTemplate.tsx
index 8bf2cea090..300ae5b194 100644
--- a/packages/client/src/components/OGDialogTemplate.tsx
+++ b/packages/client/src/components/OGDialogTemplate.tsx
@@ -1,4 +1,4 @@
-import { forwardRef, ReactNode, Ref } from 'react';
+import { forwardRef, isValidElement, ReactNode, Ref } from 'react';
 import {
   OGDialogTitle,
   OGDialogClose,
@@ -19,13 +19,39 @@ type SelectionProps = {
   isLoading?: boolean;
 };
 
+/**
+ * Type guard to check if selection is a legacy SelectionProps object
+ */
+function isSelectionProps(selection: unknown): selection is SelectionProps {
+  return (
+    typeof selection === 'object' &&
+    selection !== null &&
+    !isValidElement(selection) &&
+    ('selectHandler' in selection ||
+      'selectClasses' in selection ||
+      'selectText' in selection ||
+      'isLoading' in selection)
+  );
+}
+
 type DialogTemplateProps = {
   title: string;
   description?: string;
   main?: ReactNode;
   buttons?: ReactNode;
   leftButtons?: ReactNode;
-  selection?: SelectionProps;
+  /**
+   * Selection button configuration. Can be either:
+   * - An object with selectHandler, selectClasses, selectText, isLoading (legacy)
+   * - A ReactNode for custom selection component
+   * @example
+   * // Legacy usage
+   * selection={{ selectHandler: () => {}, selectText: 'Confirm' }}
+   * @example
+   * // Custom component
+   * selection={<Button onClick={handleConfirm}>Confirm</Button>}
+   */
+  selection?: SelectionProps | ReactNode;
   className?: string;
   overlayClassName?: string;
   headerClassName?: string;
@@ -49,14 +75,39 @@ const OGDialogTemplate = forwardRef((props: DialogTemplateProps, ref: Ref<HTMLDi
     mainClassName,
     headerClassName,
     footerClassName,
-    showCloseButton,
+    showCloseButton = false,
     overlayClassName,
     showCancelButton = true,
   } = props;
-  const { selectHandler, selectClasses, selectText, isLoading } = selection || {};
+  const isLegacySelection = isSelectionProps(selection);
+  const { selectHandler, selectClasses, selectText, isLoading } = isLegacySelection
+    ? selection
+    : {};
 
   const defaultSelect =
     'bg-gray-800 text-white transition-colors hover:bg-gray-700 disabled:cursor-not-allowed disabled:opacity-50 dark:bg-gray-200 dark:text-gray-800 dark:hover:bg-gray-200';
+
+  let selectionContent = null;
+  if (isLegacySelection) {
+    selectionContent = (
+      <OGDialogClose
+        onClick={selectHandler}
+        disabled={isLoading}
+        className={`${
+          selectClasses ?? defaultSelect
+        } flex h-10 items-center justify-center rounded-lg border-none px-4 py-2 text-sm disabled:opacity-80 max-sm:order-first max-sm:w-full sm:order-none`}
+      >
+        {isLoading === true ? (
+          <Spinner className="size-4 text-text-primary" />
+        ) : (
+          (selectText as React.JSX.Element)
+        )}
+      </OGDialogClose>
+    );
+  } else if (selection) {
+    selectionContent = selection;
+  }
+
   return (
     <OGDialogContent
       overlayClassName={overlayClassName}
@@ -75,38 +126,18 @@ const OGDialogTemplate = forwardRef((props: DialogTemplateProps, ref: Ref<HTMLDi
       </OGDialogHeader>
       <div className={cn('px-0 py-2', mainClassName)}>{main != null ? main : null}</div>
       <OGDialogFooter className={footerClassName}>
-        <div>
-          {leftButtons != null ? (
-            <div className="mt-3 flex h-auto gap-3 max-sm:w-full max-sm:flex-col sm:mt-0 sm:flex-row">
-              {leftButtons}
-            </div>
-          ) : null}
-        </div>
-        <div className="flex h-auto gap-3 max-sm:w-full max-sm:flex-col sm:flex-row">
-          {showCancelButton && (
-            <OGDialogClose asChild>
-              <Button variant="outline" aria-label={localize('com_ui_cancel')}>
-                {localize('com_ui_cancel')}
-              </Button>
-            </OGDialogClose>
-          )}
-          {buttons != null ? buttons : null}
-          {selection ? (
-            <OGDialogClose
-              onClick={selectHandler}
-              disabled={isLoading}
-              className={`${
-                selectClasses ?? defaultSelect
-              } flex h-10 items-center justify-center rounded-lg border-none px-4 py-2 text-sm disabled:opacity-80 max-sm:order-first max-sm:w-full sm:order-none`}
-            >
-              {isLoading === true ? (
-                <Spinner className="size-4 text-white" />
-              ) : (
-                (selectText as React.JSX.Element)
-              )}
-            </OGDialogClose>
-          ) : null}
-        </div>
+        {leftButtons != null ? (
+          <div className="mr-auto flex flex-row gap-2">{leftButtons}</div>
+        ) : null}
+        {showCancelButton && (
+          <OGDialogClose asChild>
+            <Button variant="outline" aria-label={localize('com_ui_cancel')}>
+              {localize('com_ui_cancel')}
+            </Button>
+          </OGDialogClose>
+        )}
+        {buttons != null ? buttons : null}
+        {selectionContent}
       </OGDialogFooter>
     </OGDialogContent>
   );
diff --git a/packages/client/src/components/OriginalDialog.tsx b/packages/client/src/components/OriginalDialog.tsx
index 451c87c227..e870cbc8c0 100644
--- a/packages/client/src/components/OriginalDialog.tsx
+++ b/packages/client/src/components/OriginalDialog.tsx
@@ -55,7 +55,7 @@ export const DialogOverlay = React.forwardRef<
   React.ComponentPropsWithoutRef<typeof DialogPrimitive.Overlay>
 >(({ className, style, ...props }, ref) => {
   const depth = React.useContext(DialogDepthContext);
-  const overlayZIndex = 50 + (depth - 1) * 60;
+  const overlayZIndex = 130 + (depth - 1) * 60;
 
   return (
     <DialogPrimitive.Overlay
@@ -94,7 +94,7 @@ const DialogContent = React.forwardRef<
     ref,
   ) => {
     const depth = React.useContext(DialogDepthContext);
-    const contentZIndex = 100 + (depth - 1) * 60;
+    const contentZIndex = 140 + (depth - 1) * 60;
 
     /* Handle Escape key to prevent closing dialog if a tooltip or dropdown has focus
     (this is a workaround in order to achieve WCAG compliance which requires
diff --git a/packages/client/src/components/Radio.tsx b/packages/client/src/components/Radio.tsx
index b4c9c21259..2f52387981 100644
--- a/packages/client/src/components/Radio.tsx
+++ b/packages/client/src/components/Radio.tsx
@@ -14,6 +14,7 @@ interface RadioProps {
   disabled?: boolean;
   className?: string;
   fullWidth?: boolean;
+  'aria-labelledby'?: string;
 }
 
 const Radio = memo(function Radio({
@@ -23,6 +24,7 @@ const Radio = memo(function Radio({
   disabled = false,
   className = '',
   fullWidth = false,
+  'aria-labelledby': ariaLabelledBy,
 }: RadioProps) {
   const localize = useLocalize();
   const buttonRefs = useRef<(HTMLButtonElement | null)[]>([]);
@@ -79,6 +81,7 @@ const Radio = memo(function Radio({
       <div
         className="relative inline-flex items-center rounded-lg bg-muted p-1 opacity-50"
         role="radiogroup"
+        aria-labelledby={ariaLabelledBy}
       >
         <span className="px-4 py-2 text-xs text-muted-foreground">
           {localize('com_ui_no_options')}
@@ -93,6 +96,7 @@ const Radio = memo(function Radio({
     <div
       className={`relative ${fullWidth ? 'flex' : 'inline-flex'} items-center rounded-lg bg-muted p-1 ${className}`}
       role="radiogroup"
+      aria-labelledby={ariaLabelledBy}
     >
       {selectedIndex >= 0 && isMounted && (
         <div
diff --git a/packages/client/src/components/ThemeSelector.tsx b/packages/client/src/components/ThemeSelector.tsx
index c1e20358df..5956e87b39 100644
--- a/packages/client/src/components/ThemeSelector.tsx
+++ b/packages/client/src/components/ThemeSelector.tsx
@@ -16,7 +16,7 @@ const Theme = ({ theme, onChange }: { theme: string; onChange: (value: string) =
 
   const themeIcons: Record<ThemeType, JSX.Element> = {
     system: <Monitor aria-hidden="true" />,
-    dark: <Moon color="white" aria-hidden="true" />,
+    dark: <Moon aria-hidden="true" />,
     light: <Sun aria-hidden="true" />,
   };
 
@@ -35,7 +35,7 @@ const Theme = ({ theme, onChange }: { theme: string; onChange: (value: string) =
 
   return (
     <button
-      className="flex items-center gap-2 rounded-lg p-2 transition-colors hover:bg-surface-hover focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 focus-visible:ring-offset-2 dark:focus-visible:ring-0"
+      className="flex items-center gap-2 rounded-lg p-2 text-text-primary transition-colors hover:bg-surface-hover focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 focus-visible:ring-offset-2 dark:focus-visible:ring-0"
       aria-label={localize('com_ui_toggle_theme')}
       aria-keyshortcuts="Ctrl+Shift+T"
       onClick={(e) => {
@@ -77,13 +77,6 @@ const ThemeSelector = ({ returnThemeOnly }: { returnThemeOnly?: boolean }) => {
     [setTheme, localize],
   );
 
-  useEffect(() => {
-    if (theme === 'system') {
-      const prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
-      setTheme(prefersDarkScheme ? 'dark' : 'light');
-    }
-  }, [theme, setTheme]);
-
   useEffect(() => {
     if (announcement) {
       const timeout = setTimeout(() => setAnnouncement(''), 1000);
diff --git a/packages/client/src/svgs/MoonshotIcon.tsx b/packages/client/src/svgs/MoonshotIcon.tsx
new file mode 100644
index 0000000000..599de9f058
--- /dev/null
+++ b/packages/client/src/svgs/MoonshotIcon.tsx
@@ -0,0 +1,16 @@
+import React from 'react';
+
+export default function MoonshotIcon({ className = '' }: { className?: string }) {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      viewBox="0 0 24 24"
+      aria-hidden="true"
+      focusable="false"
+      fill="currentColor"
+      className={className}
+    >
+      <path d="M1.052 16.916l9.539 2.552a21.007 21.007 0 00.06 2.033l5.956 1.593a11.997 11.997 0 01-5.586.865l-.18-.016-.044-.004-.084-.009-.094-.01a11.605 11.605 0 01-.157-.02l-.107-.014-.11-.016a11.962 11.962 0 01-.32-.051l-.042-.008-.075-.013-.107-.02-.07-.015-.093-.019-.075-.016-.095-.02-.097-.023-.094-.022-.068-.017-.088-.022-.09-.024-.095-.025-.082-.023-.109-.03-.062-.02-.084-.025-.093-.028-.105-.034-.058-.019-.08-.026-.09-.031-.066-.024a6.293 6.293 0 01-.044-.015l-.068-.025-.101-.037-.057-.022-.08-.03-.087-.035-.088-.035-.079-.032-.095-.04-.063-.028-.063-.027a5.655 5.655 0 01-.041-.018l-.066-.03-.103-.047-.052-.024-.096-.046-.062-.03-.084-.04-.086-.044-.093-.047-.052-.027-.103-.055-.057-.03-.058-.032a6.49 6.49 0 01-.046-.026l-.094-.053-.06-.034-.051-.03-.072-.041-.082-.05-.093-.056-.052-.032-.084-.053-.061-.039-.079-.05-.07-.047-.053-.035a7.785 7.785 0 01-.054-.036l-.044-.03-.044-.03a6.066 6.066 0 01-.04-.028l-.057-.04-.076-.054-.069-.05-.074-.054-.056-.042-.076-.057-.076-.059-.086-.067-.045-.035-.064-.052-.074-.06-.089-.073-.046-.039-.046-.039a7.516 7.516 0 01-.043-.037l-.045-.04-.061-.053-.07-.062-.068-.06-.062-.058-.067-.062-.053-.05-.088-.084a13.28 13.28 0 01-.099-.097l-.029-.028-.041-.042-.069-.07-.05-.051-.05-.053a6.457 6.457 0 01-.168-.179l-.08-.088-.062-.07-.071-.08-.042-.049-.053-.062-.058-.068-.046-.056a7.175 7.175 0 01-.027-.033l-.045-.055-.066-.082-.041-.052-.05-.064-.02-.025a11.99 11.99 0 01-1.44-2.402zm-1.02-5.794l11.353 3.037a20.468 20.468 0 00-.469 2.011l10.817 2.894a12.076 12.076 0 01-1.845 2.005L.657 15.923l-.016-.046-.035-.104a11.965 11.965 0 01-.05-.153l-.007-.023a11.896 11.896 0 01-.207-.741l-.03-.126-.018-.08-.021-.097-.018-.081-.018-.09-.017-.084-.018-.094c-.026-.141-.05-.283-.071-.426l-.017-.118-.011-.083-.013-.102a12.01 12.01 0 01-.019-.161l-.005-.047a12.12 12.12 0 01-.034-2.145zm1.593-5.15l11.948 3.196c-.368.605-.705 1.231-1.01 1.875l11.295 3.022c-.142.82-.368 1.612-.668 2.365l-11.55-3.09L.124 10.26l.015-.1.008-.049.01-.067.015-.087.018-.098c.026-.148.056-.295.088-.442l.028-.124.02-.085.024-.097c.022-.09.045-.18.07-.268l.028-.102.023-.083.03-.1.025-.082.03-.096.026-.082.031-.095a11.896 11.896 0 011.01-2.232zm4.442-4.4L17.352 4.59a20.77 20.77 0 00-1.688 1.721l7.823 2.093c.267.852.442 1.744.513 2.665L2.106 5.213l.045-.065.027-.04.04-.055.046-.065.055-.076.054-.072.064-.086.05-.065.057-.073.055-.07.06-.074.055-.069.065-.077.054-.066.066-.077.053-.06.072-.082.053-.06.067-.074.054-.058.073-.078.058-.06.063-.067.168-.17.1-.098.059-.056.076-.071a12.084 12.084 0 012.272-1.677zM12.017 0h.097l.082.001.069.001.054.002.068.002.046.001.076.003.047.002.06.003.054.002.087.005.105.007.144.011.088.007.044.004.077.008.082.008.047.005.102.012.05.006.108.014.081.01.042.006.065.01.207.032.07.012.065.011.14.026.092.018.11.022.046.01.075.016.041.01L14.7.3l.042.01.065.015.049.012.071.017.096.024.112.03.113.03.113.032.05.015.07.02.078.024.073.023.05.016.05.016.076.025.099.033.102.036.048.017.064.023.093.034.11.041.116.045.1.04.047.02.06.024.041.018.063.026.04.018.057.025.11.048.1.046.074.035.075.036.06.028.092.046.091.045.102.052.053.028.049.026.046.024.06.033.041.022.052.029.088.05.106.06.087.051.057.034.053.032.096.059.088.055.098.062.036.024.064.041.084.056.04.027.062.042.062.043.023.017c.054.037.108.075.161.114l.083.06.065.048.056.043.086.065.082.064.04.03.05.041.086.069.079.065.085.071c.712.6 1.353 1.283 1.909 2.031L7.222.994l.062-.027.065-.028.081-.034.086-.035c.113-.045.227-.09.341-.131l.096-.035.093-.033.084-.03.096-.031c.087-.03.176-.058.264-.085l.091-.027.086-.025.102-.03.085-.023.1-.026L9.04.37l.09-.023.091-.022.095-.022.09-.02.098-.021.091-.02.095-.018.092-.018.1-.018.091-.016.098-.017.092-.014.097-.015.092-.013.102-.013.091-.012.105-.012.09-.01.105-.01c.093-.01.186-.018.28-.024l.106-.008.09-.005.11-.006.093-.004.1-.004.097-.002.099-.002.197-.002z" />
+    </svg>
+  );
+}
diff --git a/packages/client/src/svgs/index.ts b/packages/client/src/svgs/index.ts
index d3f8c6e45b..1d67d44552 100644
--- a/packages/client/src/svgs/index.ts
+++ b/packages/client/src/svgs/index.ts
@@ -73,3 +73,4 @@ export { default as SheetPaths } from './SheetPaths';
 export { default as TextPaths } from './TextPaths';
 export { default as VideoPaths } from './VideoPaths';
 export { default as SharePointIcon } from './SharePointIcon';
+export { default as MoonshotIcon } from './MoonshotIcon';
diff --git a/packages/client/src/theme/atoms/themeAtoms.ts b/packages/client/src/theme/atoms/themeAtoms.ts
index 316d092fb0..0babc4036b 100644
--- a/packages/client/src/theme/atoms/themeAtoms.ts
+++ b/packages/client/src/theme/atoms/themeAtoms.ts
@@ -1,17 +1,18 @@
+// This file is kept for backward compatibility but is no longer used internally.
+// Theme state is now managed via React useState + localStorage in ThemeProvider.
+
 import { atomWithStorage } from 'jotai/utils';
 import { IThemeRGB } from '../types';
 
 /**
- * Atom for storing the theme mode (light/dark/system) in localStorage
- * Key: 'color-theme'
+ * @deprecated Use ThemeContext instead. This atom is no longer used internally.
  */
 export const themeModeAtom = atomWithStorage<string>('color-theme', 'system', undefined, {
   getOnInit: true,
 });
 
 /**
- * Atom for storing custom theme colors in localStorage
- * Key: 'theme-colors'
+ * @deprecated Use ThemeContext instead. This atom is no longer used internally.
  */
 export const themeColorsAtom = atomWithStorage<IThemeRGB | undefined>(
   'theme-colors',
@@ -23,8 +24,7 @@ export const themeColorsAtom = atomWithStorage<IThemeRGB | undefined>(
 );
 
 /**
- * Atom for storing the theme name in localStorage
- * Key: 'theme-name'
+ * @deprecated Use ThemeContext instead. This atom is no longer used internally.
  */
 export const themeNameAtom = atomWithStorage<string | undefined>(
   'theme-name',
diff --git a/packages/client/src/theme/context/ThemeProvider.tsx b/packages/client/src/theme/context/ThemeProvider.tsx
index c803796164..30773d222a 100644
--- a/packages/client/src/theme/context/ThemeProvider.tsx
+++ b/packages/client/src/theme/context/ThemeProvider.tsx
@@ -1,8 +1,10 @@
-import React, { createContext, useContext, useEffect, useMemo, useCallback, useRef } from 'react';
-import { useAtom } from 'jotai';
+import React, { createContext, useContext, useEffect, useMemo, useCallback, useState, useRef } from 'react';
 import { IThemeRGB } from '../types';
 import applyTheme from '../utils/applyTheme';
-import { themeModeAtom, themeColorsAtom, themeNameAtom } from '../atoms/themeAtoms';
+
+const THEME_KEY = 'color-theme';
+const THEME_COLORS_KEY = 'theme-colors';
+const THEME_NAME_KEY = 'theme-name';
 
 type ThemeContextType = {
   theme: string; // 'light' | 'dark' | 'system'
@@ -40,6 +42,70 @@ export const isDark = (theme: string): boolean => {
   return theme === 'dark';
 };
 
+/**
+ * Validate that a parsed value looks like an IThemeRGB object
+ */
+const isValidThemeColors = (value: unknown): value is IThemeRGB => {
+  if (typeof value !== 'object' || value === null || Array.isArray(value)) {
+    return false;
+  }
+  for (const key of Object.keys(value)) {
+    const val = (value as Record<string, unknown>)[key];
+    if (val !== undefined && typeof val !== 'string') {
+      return false;
+    }
+  }
+  return true;
+};
+
+/**
+ * Get initial theme from localStorage or default to 'system'
+ */
+const getInitialTheme = (): string => {
+  if (typeof window === 'undefined') return 'system';
+  try {
+    const stored = localStorage.getItem(THEME_KEY);
+    if (stored && ['light', 'dark', 'system'].includes(stored)) {
+      return stored;
+    }
+  } catch {
+    // localStorage not available
+  }
+  return 'system';
+};
+
+/**
+ * Get initial theme colors from localStorage
+ */
+const getInitialThemeColors = (): IThemeRGB | undefined => {
+  if (typeof window === 'undefined') return undefined;
+  try {
+    const stored = localStorage.getItem(THEME_COLORS_KEY);
+    if (stored) {
+      const parsed = JSON.parse(stored);
+      if (isValidThemeColors(parsed)) {
+        return parsed;
+      }
+    }
+  } catch {
+    // localStorage not available or invalid JSON
+  }
+  return undefined;
+};
+
+/**
+ * Get initial theme name from localStorage
+ */
+const getInitialThemeName = (): string | undefined => {
+  if (typeof window === 'undefined') return undefined;
+  try {
+    return localStorage.getItem(THEME_NAME_KEY) || undefined;
+  } catch {
+    // localStorage not available
+  }
+  return undefined;
+};
+
 /**
  * ThemeProvider component that handles both dark/light mode switching
  * and dynamic color themes via CSS variables with localStorage persistence
@@ -50,102 +116,128 @@ export function ThemeProvider({
   themeName: propThemeName,
   initialTheme,
 }: ThemeProviderProps) {
-  // Use jotai atoms for persistent state
-  const [theme, setTheme] = useAtom(themeModeAtom);
-  const [storedThemeRGB, setStoredThemeRGB] = useAtom(themeColorsAtom);
-  const [storedThemeName, setStoredThemeName] = useAtom(themeNameAtom);
+  const [theme, setThemeState] = useState<string>(getInitialTheme);
+  const [themeRGB, setThemeRGBState] = useState<IThemeRGB | undefined>(getInitialThemeColors);
+  const [themeName, setThemeNameState] = useState<string | undefined>(getInitialThemeName);
 
   // Track if props have been initialized
-  const propsInitialized = useRef(false);
+  const initialized = useRef(false);
+
+  const setTheme = useCallback((newTheme: string) => {
+    setThemeState(newTheme);
+    if (typeof window === 'undefined') return;
+    try {
+      localStorage.setItem(THEME_KEY, newTheme);
+    } catch {
+      // localStorage not available
+    }
+  }, []);
+
+  const setThemeRGB = useCallback((colors?: IThemeRGB) => {
+    setThemeRGBState(colors);
+    if (typeof window === 'undefined') return;
+    try {
+      if (colors) {
+        localStorage.setItem(THEME_COLORS_KEY, JSON.stringify(colors));
+      } else {
+        localStorage.removeItem(THEME_COLORS_KEY);
+      }
+    } catch {
+      // localStorage not available
+    }
+  }, []);
+
+  const setThemeName = useCallback((name?: string) => {
+    setThemeNameState(name);
+    if (typeof window === 'undefined') return;
+    try {
+      if (name) {
+        localStorage.setItem(THEME_NAME_KEY, name);
+      } else {
+        localStorage.removeItem(THEME_NAME_KEY);
+      }
+    } catch {
+      // localStorage not available
+    }
+  }, []);
 
   // Initialize from props only once on mount
   useEffect(() => {
-    if (!propsInitialized.current) {
-      propsInitialized.current = true;
+    if (initialized.current) return;
+    initialized.current = true;
 
-      // Set initial theme if provided
-      if (initialTheme) {
-        setTheme(initialTheme);
-      }
-
-      // Set initial theme colors if provided
-      if (propThemeRGB) {
-        setStoredThemeRGB(propThemeRGB);
-      }
-
-      // Set initial theme name if provided
-      if (propThemeName) {
-        setStoredThemeName(propThemeName);
-      }
+    // Set initial theme if provided
+    if (initialTheme) {
+      setTheme(initialTheme);
     }
-  }, [initialTheme, propThemeRGB, propThemeName, setTheme, setStoredThemeRGB, setStoredThemeName]);
+
+    // Set initial theme colors if provided
+    if (propThemeRGB) {
+      setThemeRGB(propThemeRGB);
+    }
+
+    // Set initial theme name if provided
+    if (propThemeName) {
+      setThemeName(propThemeName);
+    }
+  }, [initialTheme, propThemeRGB, propThemeName, setTheme, setThemeRGB, setThemeName]);
 
   // Apply class-based dark mode
-  const applyThemeMode = useCallback((rawTheme: string) => {
+  const applyThemeMode = useCallback((currentTheme: string) => {
     const root = window.document.documentElement;
-    const darkMode = isDark(rawTheme);
+    const darkMode = isDark(currentTheme);
 
     root.classList.remove(darkMode ? 'light' : 'dark');
     root.classList.add(darkMode ? 'dark' : 'light');
   }, []);
 
-  // Handle system theme changes
-  useEffect(() => {
-    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
-    const changeThemeOnSystemChange = () => {
-      if (theme === 'system') {
-        applyThemeMode('system');
-      }
-    };
-
-    mediaQuery.addEventListener('change', changeThemeOnSystemChange);
-    return () => {
-      mediaQuery.removeEventListener('change', changeThemeOnSystemChange);
-    };
-  }, [theme, applyThemeMode]);
-
-  // Apply dark/light mode class
+  // Apply theme mode whenever theme changes
   useEffect(() => {
     applyThemeMode(theme);
   }, [theme, applyThemeMode]);
 
+  // Listen for system theme changes when theme is 'system'
+  useEffect(() => {
+    if (theme !== 'system') return;
+
+    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
+    const handleChange = () => {
+      applyThemeMode('system');
+    };
+
+    mediaQuery.addEventListener('change', handleChange);
+    return () => mediaQuery.removeEventListener('change', handleChange);
+  }, [theme, applyThemeMode]);
+
   // Apply dynamic color theme
   useEffect(() => {
-    if (storedThemeRGB) {
-      applyTheme(storedThemeRGB);
+    if (themeRGB) {
+      applyTheme(themeRGB);
     }
-  }, [storedThemeRGB]);
+  }, [themeRGB]);
 
   // Reset theme function
   const resetTheme = useCallback(() => {
     setTheme('system');
-    setStoredThemeRGB(undefined);
-    setStoredThemeName(undefined);
+    setThemeRGB(undefined);
+    setThemeName(undefined);
     // Remove any custom CSS variables
     const root = document.documentElement;
     const customProps = Array.from(root.style).filter((prop) => prop.startsWith('--'));
     customProps.forEach((prop) => root.style.removeProperty(prop));
-  }, [setTheme, setStoredThemeRGB, setStoredThemeName]);
+  }, [setTheme, setThemeRGB, setThemeName]);
 
   const value = useMemo(
     () => ({
       theme,
       setTheme,
-      themeRGB: storedThemeRGB,
-      setThemeRGB: setStoredThemeRGB,
-      themeName: storedThemeName,
-      setThemeName: setStoredThemeName,
+      themeRGB,
+      setThemeRGB,
+      themeName,
+      setThemeName,
       resetTheme,
     }),
-    [
-      theme,
-      setTheme,
-      storedThemeRGB,
-      setStoredThemeRGB,
-      storedThemeName,
-      setStoredThemeName,
-      resetTheme,
-    ],
+    [theme, setTheme, themeRGB, setThemeRGB, themeName, setThemeName, resetTheme],
   );
 
   return <ThemeContext.Provider value={value}>{children}</ThemeContext.Provider>;
diff --git a/packages/data-provider/package.json b/packages/data-provider/package.json
index 63c7adb117..c2466e5fa9 100644
--- a/packages/data-provider/package.json
+++ b/packages/data-provider/package.json
@@ -1,6 +1,6 @@
 {
   "name": "librechat-data-provider",
-  "version": "0.8.220",
+  "version": "0.8.231",
   "description": "data services for librechat apps",
   "main": "dist/index.js",
   "module": "dist/index.es.js",
@@ -39,7 +39,7 @@
   },
   "homepage": "https://librechat.ai",
   "dependencies": {
-    "axios": "^1.12.1",
+    "axios": "^1.13.5",
     "dayjs": "^1.11.13",
     "js-yaml": "^4.1.1",
     "zod": "^3.22.4"
diff --git a/packages/data-provider/react-query/package-lock.json b/packages/data-provider/react-query/package-lock.json
index b15db0d600..02bef28d6a 100644
--- a/packages/data-provider/react-query/package-lock.json
+++ b/packages/data-provider/react-query/package-lock.json
@@ -6,7 +6,7 @@
     "": {
       "name": "librechat-data-provider/react-query",
       "dependencies": {
-        "axios": "^1.12.1"
+        "axios": "^1.13.5"
       }
     },
     "node_modules/asynckit": {
@@ -16,13 +16,13 @@
       "license": "MIT"
     },
     "node_modules/axios": {
-      "version": "1.12.1",
-      "resolved": "https://registry.npmjs.org/axios/-/axios-1.12.1.tgz",
-      "integrity": "sha512-Kn4kbSXpkFHCGE6rBFNwIv0GQs4AvDT80jlveJDKFxjbTYMUeB4QtsdPCv6H8Cm19Je7IU6VFtRl2zWZI0rudQ==",
+      "version": "1.13.5",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.13.5.tgz",
+      "integrity": "sha512-cz4ur7Vb0xS4/KUN0tPWe44eqxrIu31me+fbang3ijiNscE129POzipJJA6zniq2C/Z6sJCjMimjS8Lc/GAs8Q==",
       "license": "MIT",
       "dependencies": {
-        "follow-redirects": "^1.15.6",
-        "form-data": "^4.0.4",
+        "follow-redirects": "^1.15.11",
+        "form-data": "^4.0.5",
         "proxy-from-env": "^1.1.0"
       }
     },
@@ -140,9 +140,9 @@
       }
     },
     "node_modules/form-data": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.4.tgz",
-      "integrity": "sha512-KrGhL9Q4zjj0kiUt5OO4Mr/A/jlI2jDYs5eHBpYHPcBEVSiipAvn2Ko2HnPe20rmcuuvMHNdZFp+4IlGTMF0Ow==",
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.5.tgz",
+      "integrity": "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w==",
       "license": "MIT",
       "dependencies": {
         "asynckit": "^0.4.0",
diff --git a/packages/data-provider/react-query/package.json b/packages/data-provider/react-query/package.json
index 8fa6b067be..8bdf17a83c 100644
--- a/packages/data-provider/react-query/package.json
+++ b/packages/data-provider/react-query/package.json
@@ -5,6 +5,6 @@
   "module": "./index.es.js",
   "types": "../dist/types/react-query/index.d.ts",
   "dependencies": {
-    "axios": "^1.12.1"
+    "axios": "^1.13.5"
   }
 }
diff --git a/packages/data-provider/specs/actions.spec.ts b/packages/data-provider/specs/actions.spec.ts
index 08942d5505..59f068586d 100644
--- a/packages/data-provider/specs/actions.spec.ts
+++ b/packages/data-provider/specs/actions.spec.ts
@@ -459,6 +459,82 @@ describe('ActionRequest', () => {
     await expect(actionRequest.execute()).rejects.toThrow('Unsupported HTTP method: invalid');
   });
 
+  describe('SSRF-safe agent passthrough', () => {
+    beforeEach(() => {
+      mockedAxios.get.mockResolvedValue({ data: { success: true } });
+      mockedAxios.post.mockResolvedValue({ data: { success: true } });
+    });
+
+    it('should pass httpAgent and httpsAgent to axios.create when provided', async () => {
+      const mockHttpAgent = { keepAlive: true };
+      const mockHttpsAgent = { keepAlive: true };
+
+      const actionRequest = new ActionRequest(
+        'https://example.com',
+        '/test',
+        'GET',
+        'testOp',
+        false,
+        'application/json',
+      );
+      const executor = actionRequest.createExecutor();
+      executor.setParams({ key: 'value' });
+      await executor.execute({ httpAgent: mockHttpAgent, httpsAgent: mockHttpsAgent });
+
+      expect(mockedAxios.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          httpAgent: mockHttpAgent,
+          httpsAgent: mockHttpsAgent,
+          maxRedirects: 0,
+        }),
+      );
+    });
+
+    it('should not include agent keys when no options are provided', async () => {
+      const actionRequest = new ActionRequest(
+        'https://example.com',
+        '/test',
+        'GET',
+        'testOp',
+        false,
+        'application/json',
+      );
+      const executor = actionRequest.createExecutor();
+      executor.setParams({ key: 'value' });
+      await executor.execute();
+
+      const createArg = mockedAxios.create.mock.calls[
+        mockedAxios.create.mock.calls.length - 1
+      ][0] as Record<string, unknown>;
+      expect(createArg).not.toHaveProperty('httpAgent');
+      expect(createArg).not.toHaveProperty('httpsAgent');
+    });
+
+    it('should pass agents through for POST requests', async () => {
+      const mockAgent = { ssrf: true };
+
+      const actionRequest = new ActionRequest(
+        'https://example.com',
+        '/test',
+        'POST',
+        'testOp',
+        false,
+        'application/json',
+      );
+      const executor = actionRequest.createExecutor();
+      executor.setParams({ body: 'data' });
+      await executor.execute({ httpAgent: mockAgent, httpsAgent: mockAgent });
+
+      expect(mockedAxios.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          httpAgent: mockAgent,
+          httpsAgent: mockAgent,
+        }),
+      );
+      expect(mockedAxios.post).toHaveBeenCalled();
+    });
+  });
+
   describe('ActionRequest Concurrent Execution', () => {
     beforeEach(() => {
       jest.clearAllMocks();
diff --git a/packages/data-provider/specs/bedrock.spec.ts b/packages/data-provider/specs/bedrock.spec.ts
index 2a0de6937a..55bd0a2e08 100644
--- a/packages/data-provider/specs/bedrock.spec.ts
+++ b/packages/data-provider/specs/bedrock.spec.ts
@@ -1,5 +1,193 @@
-import { bedrockInputParser } from '../src/bedrock';
-import type { BedrockConverseInput } from '../src/bedrock';
+import {
+  supportsAdaptiveThinking,
+  bedrockOutputParser,
+  bedrockInputParser,
+  supportsContext1m,
+} from '../src/bedrock';
+
+describe('supportsAdaptiveThinking', () => {
+  test('should return true for claude-opus-4-6', () => {
+    expect(supportsAdaptiveThinking('claude-opus-4-6')).toBe(true);
+  });
+
+  test('should return true for claude-opus-4.6', () => {
+    expect(supportsAdaptiveThinking('claude-opus-4.6')).toBe(true);
+  });
+
+  test('should return true for claude-opus-4-7 (future)', () => {
+    expect(supportsAdaptiveThinking('claude-opus-4-7')).toBe(true);
+  });
+
+  test('should return true for claude-opus-5 (future)', () => {
+    expect(supportsAdaptiveThinking('claude-opus-5')).toBe(true);
+  });
+
+  test('should return true for claude-opus-9 (future)', () => {
+    expect(supportsAdaptiveThinking('claude-opus-9')).toBe(true);
+  });
+
+  test('should return true for claude-sonnet-5 (future)', () => {
+    expect(supportsAdaptiveThinking('claude-sonnet-5')).toBe(true);
+  });
+
+  test('should return true for claude-sonnet-6 (future)', () => {
+    expect(supportsAdaptiveThinking('claude-sonnet-6')).toBe(true);
+  });
+
+  test('should return false for claude-opus-4-5', () => {
+    expect(supportsAdaptiveThinking('claude-opus-4-5')).toBe(false);
+  });
+
+  test('should return false for claude-opus-4', () => {
+    expect(supportsAdaptiveThinking('claude-opus-4')).toBe(false);
+  });
+
+  test('should return false for claude-opus-4-0', () => {
+    expect(supportsAdaptiveThinking('claude-opus-4-0')).toBe(false);
+  });
+
+  test('should return true for claude-sonnet-4-6', () => {
+    expect(supportsAdaptiveThinking('claude-sonnet-4-6')).toBe(true);
+  });
+
+  test('should return true for claude-sonnet-4.6', () => {
+    expect(supportsAdaptiveThinking('claude-sonnet-4.6')).toBe(true);
+  });
+
+  test('should return true for claude-sonnet-4-7 (future)', () => {
+    expect(supportsAdaptiveThinking('claude-sonnet-4-7')).toBe(true);
+  });
+
+  test('should return true for anthropic.claude-sonnet-4-6 (Bedrock)', () => {
+    expect(supportsAdaptiveThinking('anthropic.claude-sonnet-4-6')).toBe(true);
+  });
+
+  test('should return true for us.anthropic.claude-sonnet-4-6 (cross-region Bedrock)', () => {
+    expect(supportsAdaptiveThinking('us.anthropic.claude-sonnet-4-6')).toBe(true);
+  });
+
+  test('should return true for claude-4-6-sonnet (alternate naming)', () => {
+    expect(supportsAdaptiveThinking('claude-4-6-sonnet')).toBe(true);
+  });
+
+  test('should return false for claude-sonnet-4-5', () => {
+    expect(supportsAdaptiveThinking('claude-sonnet-4-5')).toBe(false);
+  });
+
+  test('should return false for claude-sonnet-4', () => {
+    expect(supportsAdaptiveThinking('claude-sonnet-4')).toBe(false);
+  });
+
+  test('should return false for claude-3-7-sonnet', () => {
+    expect(supportsAdaptiveThinking('claude-3-7-sonnet')).toBe(false);
+  });
+
+  test('should return false for unrelated model', () => {
+    expect(supportsAdaptiveThinking('gpt-4o')).toBe(false);
+  });
+
+  test('should handle Bedrock model ID with prefix stripping', () => {
+    expect(supportsAdaptiveThinking('anthropic.claude-opus-4-6-v1:0')).toBe(true);
+  });
+
+  test('should handle cross-region Bedrock model ID', () => {
+    expect(supportsAdaptiveThinking('us.anthropic.claude-opus-4-6-v1')).toBe(true);
+  });
+
+  test('should return true for claude-4-6-opus (alternate naming)', () => {
+    expect(supportsAdaptiveThinking('claude-4-6-opus')).toBe(true);
+  });
+
+  test('should return true for anthropic.claude-4-6-opus (alternate naming)', () => {
+    expect(supportsAdaptiveThinking('anthropic.claude-4-6-opus')).toBe(true);
+  });
+
+  test('should return true for claude-5-sonnet (alternate naming)', () => {
+    expect(supportsAdaptiveThinking('claude-5-sonnet')).toBe(true);
+  });
+
+  test('should return true for anthropic.claude-5-sonnet (alternate naming)', () => {
+    expect(supportsAdaptiveThinking('anthropic.claude-5-sonnet')).toBe(true);
+  });
+
+  test('should return false for claude-4-5-opus (alternate naming, below threshold)', () => {
+    expect(supportsAdaptiveThinking('claude-4-5-opus')).toBe(false);
+  });
+
+  test('should return false for claude-4-sonnet (alternate naming, below threshold)', () => {
+    expect(supportsAdaptiveThinking('claude-4-sonnet')).toBe(false);
+  });
+});
+
+describe('supportsContext1m', () => {
+  test('should return true for claude-sonnet-4', () => {
+    expect(supportsContext1m('claude-sonnet-4')).toBe(true);
+  });
+
+  test('should return true for claude-sonnet-4-5', () => {
+    expect(supportsContext1m('claude-sonnet-4-5')).toBe(true);
+  });
+
+  test('should return true for claude-sonnet-4-6', () => {
+    expect(supportsContext1m('claude-sonnet-4-6')).toBe(true);
+  });
+
+  test('should return true for anthropic.claude-sonnet-4-6 (Bedrock)', () => {
+    expect(supportsContext1m('anthropic.claude-sonnet-4-6')).toBe(true);
+  });
+
+  test('should return true for claude-sonnet-5 (future)', () => {
+    expect(supportsContext1m('claude-sonnet-5')).toBe(true);
+  });
+
+  test('should return true for claude-opus-4-6', () => {
+    expect(supportsContext1m('claude-opus-4-6')).toBe(true);
+  });
+
+  test('should return true for claude-opus-5 (future)', () => {
+    expect(supportsContext1m('claude-opus-5')).toBe(true);
+  });
+
+  test('should return false for claude-opus-4-5', () => {
+    expect(supportsContext1m('claude-opus-4-5')).toBe(false);
+  });
+
+  test('should return false for claude-opus-4', () => {
+    expect(supportsContext1m('claude-opus-4')).toBe(false);
+  });
+
+  test('should return false for claude-3-7-sonnet', () => {
+    expect(supportsContext1m('claude-3-7-sonnet')).toBe(false);
+  });
+
+  test('should return false for claude-sonnet-3', () => {
+    expect(supportsContext1m('claude-sonnet-3')).toBe(false);
+  });
+
+  test('should return false for unrelated model', () => {
+    expect(supportsContext1m('gpt-4o')).toBe(false);
+  });
+
+  test('should return true for claude-4-sonnet (alternate naming)', () => {
+    expect(supportsContext1m('claude-4-sonnet')).toBe(true);
+  });
+
+  test('should return true for claude-5-sonnet (alternate naming)', () => {
+    expect(supportsContext1m('claude-5-sonnet')).toBe(true);
+  });
+
+  test('should return true for claude-4-6-opus (alternate naming)', () => {
+    expect(supportsContext1m('claude-4-6-opus')).toBe(true);
+  });
+
+  test('should return false for claude-3-sonnet (alternate naming, below threshold)', () => {
+    expect(supportsContext1m('claude-3-sonnet')).toBe(false);
+  });
+
+  test('should return false for claude-4-5-opus (alternate naming, below threshold)', () => {
+    expect(supportsContext1m('claude-4-5-opus')).toBe(false);
+  });
+});
 
 describe('bedrockInputParser', () => {
   describe('Model Matching for Reasoning Configuration', () => {
@@ -7,84 +195,141 @@ describe('bedrockInputParser', () => {
       const input = {
         model: 'anthropic.claude-3-7-sonnet',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBe(true);
       expect(additionalFields.thinkingBudget).toBe(2000);
       expect(additionalFields.anthropic_beta).toEqual(['output-128k-2025-02-19']);
     });
 
-    test('should match anthropic.claude-sonnet-4 model', () => {
+    test('should match anthropic.claude-sonnet-4 model with 1M context header', () => {
       const input = {
         model: 'anthropic.claude-sonnet-4',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBe(true);
       expect(additionalFields.thinkingBudget).toBe(2000);
-      expect(additionalFields.anthropic_beta).toEqual(['output-128k-2025-02-19']);
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
     });
 
-    test('should match anthropic.claude-opus-5 model', () => {
+    test('should match anthropic.claude-opus-5 model with adaptive thinking and 1M context', () => {
       const input = {
         model: 'anthropic.claude-opus-5',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
-      expect(additionalFields.thinking).toBe(true);
-      expect(additionalFields.thinkingBudget).toBe(2000);
-      expect(additionalFields.anthropic_beta).toEqual(['output-128k-2025-02-19']);
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
     });
 
-    test('should match anthropic.claude-haiku-6 model', () => {
+    test('should match anthropic.claude-haiku-6 model without 1M context header', () => {
       const input = {
         model: 'anthropic.claude-haiku-6',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBe(true);
       expect(additionalFields.thinkingBudget).toBe(2000);
       expect(additionalFields.anthropic_beta).toEqual(['output-128k-2025-02-19']);
     });
 
-    test('should match anthropic.claude-4-sonnet model', () => {
+    test('should match anthropic.claude-4-sonnet model with 1M context header', () => {
       const input = {
         model: 'anthropic.claude-4-sonnet',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBe(true);
       expect(additionalFields.thinkingBudget).toBe(2000);
-      expect(additionalFields.anthropic_beta).toEqual(['output-128k-2025-02-19']);
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
     });
 
-    test('should match anthropic.claude-4.5-sonnet model', () => {
+    test('should match anthropic.claude-4.5-sonnet model with 1M context header', () => {
       const input = {
         model: 'anthropic.claude-4.5-sonnet',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBe(true);
       expect(additionalFields.thinkingBudget).toBe(2000);
-      expect(additionalFields.anthropic_beta).toEqual(['output-128k-2025-02-19']);
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
     });
 
-    test('should match anthropic.claude-4-7-sonnet model', () => {
+    test('should match anthropic.claude-sonnet-4-6 with adaptive thinking and 1M context header', () => {
+      const input = {
+        model: 'anthropic.claude-sonnet-4-6',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
+    });
+
+    test('should match us.anthropic.claude-sonnet-4-6 with adaptive thinking and 1M context header', () => {
+      const input = {
+        model: 'us.anthropic.claude-sonnet-4-6',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
+    });
+
+    test('should match anthropic.claude-4-7-sonnet model with adaptive thinking and 1M context header', () => {
       const input = {
         model: 'anthropic.claude-4-7-sonnet',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
+    });
+
+    test('should match anthropic.claude-sonnet-4-20250514-v1:0 with full model ID', () => {
+      const input = {
+        model: 'anthropic.claude-sonnet-4-20250514-v1:0',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBe(true);
       expect(additionalFields.thinkingBudget).toBe(2000);
-      expect(additionalFields.anthropic_beta).toEqual(['output-128k-2025-02-19']);
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
     });
 
     test('should not match non-Claude models', () => {
       const input = {
         model: 'some-other-model',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       expect(result.additionalModelRequestFields).toBeUndefined();
     });
 
@@ -92,7 +337,7 @@ describe('bedrockInputParser', () => {
       const input = {
         model: 'moonshot.kimi-k2-0711-thinking',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as
         | Record<string, unknown>
         | undefined;
@@ -103,22 +348,26 @@ describe('bedrockInputParser', () => {
       const input = {
         model: 'deepseek.deepseek-r1',
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as
         | Record<string, unknown>
         | undefined;
       expect(additionalFields?.anthropic_beta).toBeUndefined();
     });
 
-    test('should respect explicit thinking configuration', () => {
+    test('should respect explicit thinking configuration but still add beta headers', () => {
       const input = {
         model: 'anthropic.claude-sonnet-4',
         thinking: false,
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBeUndefined();
       expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
     });
 
     test('should respect custom thinking budget', () => {
@@ -127,10 +376,317 @@ describe('bedrockInputParser', () => {
         thinking: true,
         thinkingBudget: 3000,
       };
-      const result = bedrockInputParser.parse(input) as BedrockConverseInput;
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
       const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
       expect(additionalFields.thinking).toBe(true);
       expect(additionalFields.thinkingBudget).toBe(3000);
     });
   });
+
+  describe('Opus 4.6 Adaptive Thinking', () => {
+    test('should default to adaptive thinking for anthropic.claude-opus-4-6-v1', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-6-v1',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
+    });
+
+    test('should handle cross-region model ID us.anthropic.claude-opus-4-6-v1', () => {
+      const input = {
+        model: 'us.anthropic.claude-opus-4-6-v1',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
+    });
+
+    test('should handle cross-region model ID global.anthropic.claude-opus-4-6-v1', () => {
+      const input = {
+        model: 'global.anthropic.claude-opus-4-6-v1',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
+    });
+
+    test('should pass effort parameter via output_config for adaptive models', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-6-v1',
+        effort: 'medium',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.output_config).toEqual({ effort: 'medium' });
+      expect(additionalFields.effort).toBeUndefined();
+    });
+
+    test('should not include output_config when effort is unset (empty string)', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-6-v1',
+        effort: '',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.output_config).toBeUndefined();
+    });
+
+    test('should respect thinking=false for adaptive models', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-6-v1',
+        thinking: false,
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toBeUndefined();
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.anthropic_beta).toEqual([
+        'output-128k-2025-02-19',
+        'context-1m-2025-08-07',
+      ]);
+    });
+
+    test('should preserve effort when thinking=false for adaptive models', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-6-v1',
+        thinking: false,
+        effort: 'high',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toBeUndefined();
+      expect(additionalFields.thinkingBudget).toBeUndefined();
+      expect(additionalFields.output_config).toEqual({ effort: 'high' });
+      expect(additionalFields.effort).toBeUndefined();
+    });
+
+    test('should strip effort for non-adaptive thinking models', () => {
+      const input = {
+        model: 'anthropic.claude-sonnet-4-5-20250929-v1:0',
+        effort: 'high',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toBe(true);
+      expect(additionalFields.thinkingBudget).toBe(2000);
+      expect(additionalFields.effort).toBeUndefined();
+      expect(additionalFields.output_config).toBeUndefined();
+    });
+
+    test('should not include effort for Opus 4.5 (non-adaptive)', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-5-v1:0',
+        effort: 'low',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toBe(true);
+      expect(additionalFields.effort).toBeUndefined();
+      expect(additionalFields.output_config).toBeUndefined();
+    });
+
+    test('should support max effort for Opus 4.6', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-6-v1',
+        effort: 'max',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const additionalFields = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(additionalFields.thinking).toEqual({ type: 'adaptive' });
+      expect(additionalFields.output_config).toEqual({ effort: 'max' });
+    });
+  });
+
+  describe('bedrockOutputParser with configureThinking', () => {
+    test('should preserve adaptive thinking config without setting default maxTokens', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-opus-4-6-v1',
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      const amrf = output.additionalModelRequestFields as Record<string, unknown>;
+      expect(amrf.thinking).toEqual({ type: 'adaptive' });
+      expect(output.maxTokens).toBeUndefined();
+      expect(output.maxOutputTokens).toBeUndefined();
+    });
+
+    test('should respect user-provided maxTokens for adaptive model', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-opus-4-6-v1',
+        maxTokens: 32000,
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      expect(output.maxTokens).toBe(32000);
+    });
+
+    test('should use maxOutputTokens as maxTokens for adaptive model when maxTokens is not set', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-opus-4-6-v1',
+        maxOutputTokens: 24000,
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      expect(output.maxTokens).toBe(24000);
+      expect(output.maxOutputTokens).toBeUndefined();
+    });
+
+    test('should convert thinking=true to enabled config for non-adaptive models', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-sonnet-4-5-20250929-v1:0',
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      const amrf = output.additionalModelRequestFields as Record<string, unknown>;
+      expect(amrf.thinking).toEqual({ type: 'enabled', budget_tokens: 2000 });
+      expect(output.maxTokens).toBe(8192);
+    });
+
+    test('should pass output_config through for adaptive model with effort', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-opus-4-6-v1',
+        effort: 'low',
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      const amrf = output.additionalModelRequestFields as Record<string, unknown>;
+      expect(amrf.thinking).toEqual({ type: 'adaptive' });
+      expect(amrf.output_config).toEqual({ effort: 'low' });
+    });
+
+    test('should not set maxTokens for adaptive models when neither maxTokens nor maxOutputTokens are provided', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-opus-4-6-v1',
+      }) as Record<string, unknown>;
+      parsed.maxOutputTokens = undefined;
+      (parsed as Record<string, unknown>).maxTokens = undefined;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      expect(output.maxTokens).toBeUndefined();
+    });
+
+    test('should use enabled default maxTokens (8192) for non-adaptive thinking models', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-sonnet-4-5-20250929-v1:0',
+      }) as Record<string, unknown>;
+      parsed.maxOutputTokens = undefined;
+      (parsed as Record<string, unknown>).maxTokens = undefined;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      expect(output.maxTokens).toBe(8192);
+    });
+
+    test('should use default thinking budget (2000) when no custom budget is set', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-3-7-sonnet',
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      const amrf = output.additionalModelRequestFields as Record<string, unknown>;
+      const thinking = amrf.thinking as { type: string; budget_tokens: number };
+      expect(thinking.budget_tokens).toBe(2000);
+    });
+
+    test('should override default thinking budget with custom value', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'anthropic.claude-3-7-sonnet',
+        thinkingBudget: 5000,
+        maxTokens: 8192,
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      const amrf = output.additionalModelRequestFields as Record<string, unknown>;
+      const thinking = amrf.thinking as { type: string; budget_tokens: number };
+      expect(thinking.budget_tokens).toBe(5000);
+    });
+
+    test('should remove additionalModelRequestFields when thinking disabled and no other fields', () => {
+      const parsed = bedrockInputParser.parse({
+        model: 'some-other-model',
+      }) as Record<string, unknown>;
+      const output = bedrockOutputParser(parsed as Record<string, unknown>);
+      expect(output.additionalModelRequestFields).toBeUndefined();
+    });
+  });
+
+  describe('Model switching cleanup', () => {
+    test('should strip anthropic_beta when switching from Anthropic to non-Anthropic model', () => {
+      const staleConversationData = {
+        model: 'openai.gpt-oss-120b-1:0',
+        promptCache: true,
+        additionalModelRequestFields: {
+          anthropic_beta: ['output-128k-2025-02-19', 'context-1m-2025-08-07'],
+          thinking: { type: 'adaptive' },
+          output_config: { effort: 'high' },
+        },
+      };
+      const result = bedrockInputParser.parse(staleConversationData) as Record<string, unknown>;
+      const amrf = result.additionalModelRequestFields as Record<string, unknown> | undefined;
+      expect(amrf?.anthropic_beta).toBeUndefined();
+      expect(amrf?.thinking).toBeUndefined();
+      expect(amrf?.output_config).toBeUndefined();
+      expect(result.promptCache).toBeUndefined();
+    });
+
+    test('should strip promptCache when switching from Claude to non-Claude/Nova model', () => {
+      const staleConversationData = {
+        model: 'deepseek.deepseek-r1',
+        promptCache: true,
+      };
+      const result = bedrockInputParser.parse(staleConversationData) as Record<string, unknown>;
+      expect(result.promptCache).toBeUndefined();
+    });
+
+    test('should preserve promptCache for Claude models', () => {
+      const input = {
+        model: 'anthropic.claude-sonnet-4-20250514-v1:0',
+        promptCache: true,
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      expect(result.promptCache).toBe(true);
+    });
+
+    test('should preserve promptCache for Nova models', () => {
+      const input = {
+        model: 'amazon.nova-pro-v1:0',
+        promptCache: true,
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      expect(result.promptCache).toBe(true);
+    });
+
+    test('should strip stale thinking config from additionalModelRequestFields for non-Anthropic models', () => {
+      const staleConversationData = {
+        model: 'moonshot.kimi-k2-0711-thinking',
+        additionalModelRequestFields: {
+          thinking: { type: 'enabled', budget_tokens: 2000 },
+          thinkingBudget: 2000,
+          anthropic_beta: ['output-128k-2025-02-19'],
+        },
+      };
+      const result = bedrockInputParser.parse(staleConversationData) as Record<string, unknown>;
+      const amrf = result.additionalModelRequestFields as Record<string, unknown> | undefined;
+      expect(amrf?.anthropic_beta).toBeUndefined();
+      expect(amrf?.thinking).toBeUndefined();
+      expect(amrf?.thinkingBudget).toBeUndefined();
+    });
+
+    test('should not strip anthropic_beta when staying on an Anthropic model', () => {
+      const input = {
+        model: 'anthropic.claude-opus-4-6-v1',
+      };
+      const result = bedrockInputParser.parse(input) as Record<string, unknown>;
+      const amrf = result.additionalModelRequestFields as Record<string, unknown>;
+      expect(amrf.anthropic_beta).toBeDefined();
+      expect(Array.isArray(amrf.anthropic_beta)).toBe(true);
+    });
+  });
 });
diff --git a/packages/data-provider/specs/parsers.spec.ts b/packages/data-provider/specs/parsers.spec.ts
index f506d16c6c..90359d6e6f 100644
--- a/packages/data-provider/specs/parsers.spec.ts
+++ b/packages/data-provider/specs/parsers.spec.ts
@@ -1,6 +1,8 @@
-import { replaceSpecialVars, parseCompactConvo } from '../src/parsers';
+import { replaceSpecialVars, parseConvo, parseCompactConvo, parseTextParts } from '../src/parsers';
 import { specialVariables } from '../src/config';
 import { EModelEndpoint } from '../src/schemas';
+import { ContentTypes } from '../src/types/runs';
+import type { TMessageContentParts } from '../src/types/assistants';
 import type { TUser, TConversation } from '../src/types';
 
 // Mock dayjs module with consistent date/time values regardless of environment
@@ -141,7 +143,7 @@ describe('parseCompactConvo', () => {
       });
 
       expect(result).not.toBeNull();
-      expect(result?.iconURL).toBeUndefined();
+      expect(result?.['iconURL']).toBeUndefined();
       expect(result?.model).toBe('gpt-4');
     });
 
@@ -159,7 +161,7 @@ describe('parseCompactConvo', () => {
       });
 
       expect(result).not.toBeNull();
-      expect(result?.iconURL).toBeUndefined();
+      expect(result?.['iconURL']).toBeUndefined();
       expect(result?.agent_id).toBe('agent_123');
     });
 
@@ -177,7 +179,7 @@ describe('parseCompactConvo', () => {
       });
 
       expect(result).not.toBeNull();
-      expect(result?.iconURL).toBeUndefined();
+      expect(result?.['iconURL']).toBeUndefined();
       expect(result?.model).toBe('claude-3-opus');
     });
 
@@ -195,7 +197,7 @@ describe('parseCompactConvo', () => {
       });
 
       expect(result).not.toBeNull();
-      expect(result?.iconURL).toBeUndefined();
+      expect(result?.['iconURL']).toBeUndefined();
       expect(result?.model).toBe('gemini-pro');
     });
 
@@ -213,7 +215,7 @@ describe('parseCompactConvo', () => {
       });
 
       expect(result).not.toBeNull();
-      expect(result?.iconURL).toBeUndefined();
+      expect(result?.['iconURL']).toBeUndefined();
       expect(result?.assistant_id).toBe('asst_123');
     });
 
@@ -234,7 +236,7 @@ describe('parseCompactConvo', () => {
       });
 
       expect(result).not.toBeNull();
-      expect(result?.iconURL).toBeUndefined();
+      expect(result?.['iconURL']).toBeUndefined();
       expect(result?.model).toBe('gpt-4');
       expect(result?.temperature).toBe(0.7);
       expect(result?.top_p).toBe(0.9);
@@ -254,8 +256,345 @@ describe('parseCompactConvo', () => {
       });
 
       expect(result).not.toBeNull();
-      expect(result?.iconURL).toBeUndefined();
+      expect(result?.['iconURL']).toBeUndefined();
       expect(result?.model).toBe('gpt-4');
     });
   });
 });
+
+describe('parseConvo - defaultParamsEndpoint', () => {
+  test('should strip maxOutputTokens for custom endpoint without defaultParamsEndpoint', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'anthropic/claude-opus-4.5',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+      maxContextTokens: 50000,
+    };
+
+    const result = parseConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.temperature).toBe(0.7);
+    expect(result?.maxContextTokens).toBe(50000);
+    expect(result?.maxOutputTokens).toBeUndefined();
+  });
+
+  test('should preserve maxOutputTokens when defaultParamsEndpoint is anthropic', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'anthropic/claude-opus-4.5',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+      topP: 0.9,
+      topK: 40,
+      maxContextTokens: 50000,
+    };
+
+    const result = parseConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+      defaultParamsEndpoint: EModelEndpoint.anthropic,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.model).toBe('anthropic/claude-opus-4.5');
+    expect(result?.temperature).toBe(0.7);
+    expect(result?.maxOutputTokens).toBe(8192);
+    expect(result?.topP).toBe(0.9);
+    expect(result?.topK).toBe(40);
+    expect(result?.maxContextTokens).toBe(50000);
+  });
+
+  test('should strip OpenAI-specific fields when defaultParamsEndpoint is anthropic', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'anthropic/claude-opus-4.5',
+      temperature: 0.7,
+      max_tokens: 4096,
+      top_p: 0.9,
+      presence_penalty: 0.5,
+      frequency_penalty: 0.3,
+    };
+
+    const result = parseConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+      defaultParamsEndpoint: EModelEndpoint.anthropic,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.temperature).toBe(0.7);
+    expect(result?.max_tokens).toBeUndefined();
+    expect(result?.top_p).toBeUndefined();
+    expect(result?.presence_penalty).toBeUndefined();
+    expect(result?.frequency_penalty).toBeUndefined();
+  });
+
+  test('should preserve max_tokens when defaultParamsEndpoint is not set (OpenAI default)', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'gpt-4o',
+      temperature: 0.7,
+      max_tokens: 4096,
+      top_p: 0.9,
+    };
+
+    const result = parseConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.max_tokens).toBe(4096);
+    expect(result?.top_p).toBe(0.9);
+  });
+
+  test('should preserve Google-specific fields when defaultParamsEndpoint is google', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'gemini-pro',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+      topP: 0.9,
+      topK: 40,
+    };
+
+    const result = parseConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+      defaultParamsEndpoint: EModelEndpoint.google,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.maxOutputTokens).toBe(8192);
+    expect(result?.topP).toBe(0.9);
+    expect(result?.topK).toBe(40);
+  });
+
+  test('should not strip fields from non-custom endpoints that already have a schema', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'gpt-4o',
+      temperature: 0.7,
+      max_tokens: 4096,
+      top_p: 0.9,
+    };
+
+    const result = parseConvo({
+      endpoint: EModelEndpoint.openAI,
+      conversation,
+      defaultParamsEndpoint: EModelEndpoint.anthropic,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.max_tokens).toBe(4096);
+    expect(result?.top_p).toBe(0.9);
+  });
+
+  test('should not carry bedrock region to custom endpoint without defaultParamsEndpoint', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'gpt-4o',
+      temperature: 0.7,
+      region: 'us-east-1',
+    };
+
+    const result = parseConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.temperature).toBe(0.7);
+    expect(result?.region).toBeUndefined();
+  });
+
+  test('should fall back to endpointType schema when defaultParamsEndpoint is invalid', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'gpt-4o',
+      temperature: 0.7,
+      max_tokens: 4096,
+      maxOutputTokens: 8192,
+    };
+
+    const result = parseConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+      defaultParamsEndpoint: 'nonexistent_endpoint',
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.max_tokens).toBe(4096);
+    expect(result?.maxOutputTokens).toBeUndefined();
+  });
+});
+
+describe('parseCompactConvo - defaultParamsEndpoint', () => {
+  test('should strip maxOutputTokens for custom endpoint without defaultParamsEndpoint', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'anthropic/claude-opus-4.5',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+    };
+
+    const result = parseCompactConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.temperature).toBe(0.7);
+    expect(result?.maxOutputTokens).toBeUndefined();
+  });
+
+  test('should preserve maxOutputTokens when defaultParamsEndpoint is anthropic', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'anthropic/claude-opus-4.5',
+      temperature: 0.7,
+      maxOutputTokens: 8192,
+      topP: 0.9,
+      maxContextTokens: 50000,
+    };
+
+    const result = parseCompactConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+      defaultParamsEndpoint: EModelEndpoint.anthropic,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.maxOutputTokens).toBe(8192);
+    expect(result?.topP).toBe(0.9);
+    expect(result?.maxContextTokens).toBe(50000);
+  });
+
+  test('should strip iconURL even when defaultParamsEndpoint is set', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'anthropic/claude-opus-4.5',
+      iconURL: 'https://malicious.com/track.png',
+      maxOutputTokens: 8192,
+    };
+
+    const result = parseCompactConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+      defaultParamsEndpoint: EModelEndpoint.anthropic,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.['iconURL']).toBeUndefined();
+    expect(result?.maxOutputTokens).toBe(8192);
+  });
+
+  test('should fall back to endpointType when defaultParamsEndpoint is null', () => {
+    const conversation: Partial<TConversation> = {
+      model: 'gpt-4o',
+      max_tokens: 4096,
+      maxOutputTokens: 8192,
+    };
+
+    const result = parseCompactConvo({
+      endpoint: 'MyCustomEndpoint' as EModelEndpoint,
+      endpointType: EModelEndpoint.custom,
+      conversation,
+      defaultParamsEndpoint: null,
+    });
+
+    expect(result).not.toBeNull();
+    expect(result?.max_tokens).toBe(4096);
+    expect(result?.maxOutputTokens).toBeUndefined();
+  });
+});
+
+describe('parseTextParts', () => {
+  test('should concatenate text parts', () => {
+    const parts: TMessageContentParts[] = [
+      { type: ContentTypes.TEXT, text: 'Hello' },
+      { type: ContentTypes.TEXT, text: 'World' },
+    ];
+    expect(parseTextParts(parts)).toBe('Hello World');
+  });
+
+  test('should handle text parts with object-style text values', () => {
+    const parts: TMessageContentParts[] = [
+      { type: ContentTypes.TEXT, text: { value: 'structured text' } },
+    ];
+    expect(parseTextParts(parts)).toBe('structured text');
+  });
+
+  test('should include think parts by default', () => {
+    const parts: TMessageContentParts[] = [
+      { type: ContentTypes.TEXT, text: 'Answer:' },
+      { type: ContentTypes.THINK, think: 'reasoning step' },
+    ];
+    expect(parseTextParts(parts)).toBe('Answer: reasoning step');
+  });
+
+  test('should skip think parts when skipReasoning is true', () => {
+    const parts: TMessageContentParts[] = [
+      { type: ContentTypes.THINK, think: 'internal reasoning' },
+      { type: ContentTypes.TEXT, text: 'visible answer' },
+    ];
+    expect(parseTextParts(parts, true)).toBe('visible answer');
+  });
+
+  test('should skip non-text/think part types', () => {
+    const parts: TMessageContentParts[] = [
+      { type: ContentTypes.TEXT, text: 'before' },
+      { type: ContentTypes.IMAGE_FILE } as TMessageContentParts,
+      { type: ContentTypes.TEXT, text: 'after' },
+    ];
+    expect(parseTextParts(parts)).toBe('before after');
+  });
+
+  test('should handle undefined elements in the content parts array', () => {
+    const parts: Array<TMessageContentParts | undefined> = [
+      { type: ContentTypes.TEXT, text: 'first' },
+      undefined,
+      { type: ContentTypes.TEXT, text: 'third' },
+    ];
+    expect(parseTextParts(parts)).toBe('first third');
+  });
+
+  test('should handle multiple consecutive undefined elements', () => {
+    const parts: Array<TMessageContentParts | undefined> = [
+      undefined,
+      undefined,
+      { type: ContentTypes.TEXT, text: 'only text' },
+      undefined,
+    ];
+    expect(parseTextParts(parts)).toBe('only text');
+  });
+
+  test('should handle an array of all undefined elements', () => {
+    const parts: Array<TMessageContentParts | undefined> = [undefined, undefined, undefined];
+    expect(parseTextParts(parts)).toBe('');
+  });
+
+  test('should handle parts with missing type property', () => {
+    const parts: Array<TMessageContentParts | undefined> = [
+      { text: 'no type field' } as unknown as TMessageContentParts,
+      { type: ContentTypes.TEXT, text: 'valid' },
+    ];
+    expect(parseTextParts(parts)).toBe('valid');
+  });
+
+  test('should return empty string for empty array', () => {
+    expect(parseTextParts([])).toBe('');
+  });
+
+  test('should not add extra spaces when parts already have spacing', () => {
+    const parts: TMessageContentParts[] = [
+      { type: ContentTypes.TEXT, text: 'Hello ' },
+      { type: ContentTypes.TEXT, text: 'World' },
+    ];
+    expect(parseTextParts(parts)).toBe('Hello World');
+  });
+});
diff --git a/packages/data-provider/src/accessPermissions.ts b/packages/data-provider/src/accessPermissions.ts
index 5fa288e4b3..f2431fcf9a 100644
--- a/packages/data-provider/src/accessPermissions.ts
+++ b/packages/data-provider/src/accessPermissions.ts
@@ -46,6 +46,7 @@ export enum ResourceType {
   AGENT = 'agent',
   PROMPTGROUP = 'promptGroup',
   MCPSERVER = 'mcpServer',
+  REMOTE_AGENT = 'remoteAgent',
 }
 
 /**
@@ -75,6 +76,9 @@ export enum AccessRoleIds {
   MCPSERVER_VIEWER = 'mcpServer_viewer',
   MCPSERVER_EDITOR = 'mcpServer_editor',
   MCPSERVER_OWNER = 'mcpServer_owner',
+  REMOTE_AGENT_VIEWER = 'remoteAgent_viewer',
+  REMOTE_AGENT_EDITOR = 'remoteAgent_editor',
+  REMOTE_AGENT_OWNER = 'remoteAgent_owner',
 }
 
 // ===== ZOD SCHEMAS =====
@@ -310,11 +314,22 @@ export function permBitsToAccessLevel(permBits: number): TAccessLevel {
 export function accessRoleToPermBits(accessRoleId: string): number {
   switch (accessRoleId) {
     case AccessRoleIds.AGENT_VIEWER:
+    case AccessRoleIds.PROMPTGROUP_VIEWER:
+    case AccessRoleIds.MCPSERVER_VIEWER:
+    case AccessRoleIds.REMOTE_AGENT_VIEWER:
       return PermissionBits.VIEW;
     case AccessRoleIds.AGENT_EDITOR:
+    case AccessRoleIds.PROMPTGROUP_EDITOR:
+    case AccessRoleIds.MCPSERVER_EDITOR:
+    case AccessRoleIds.REMOTE_AGENT_EDITOR:
       return PermissionBits.VIEW | PermissionBits.EDIT;
     case AccessRoleIds.AGENT_OWNER:
-      return PermissionBits.VIEW | PermissionBits.EDIT | PermissionBits.DELETE;
+    case AccessRoleIds.PROMPTGROUP_OWNER:
+    case AccessRoleIds.MCPSERVER_OWNER:
+    case AccessRoleIds.REMOTE_AGENT_OWNER:
+      return (
+        PermissionBits.VIEW | PermissionBits.EDIT | PermissionBits.DELETE | PermissionBits.SHARE
+      );
     default:
       return PermissionBits.VIEW;
   }
diff --git a/packages/data-provider/src/actions.ts b/packages/data-provider/src/actions.ts
index c7566e479f..53c9e8ae1c 100644
--- a/packages/data-provider/src/actions.ts
+++ b/packages/data-provider/src/actions.ts
@@ -283,7 +283,7 @@ class RequestExecutor {
     return this;
   }
 
-  async execute() {
+  async execute(options?: { httpAgent?: unknown; httpsAgent?: unknown }) {
     const url = createURL(this.config.domain, this.path);
     const headers: Record<string, string> = {
       ...this.authHeaders,
@@ -300,10 +300,15 @@ class RequestExecutor {
      *
      * By setting maxRedirects: 0, we prevent this attack vector.
      * The action will receive the redirect response (3xx) instead of following it.
+     *
+     * SECURITY: When httpAgent/httpsAgent are provided (SSRF-safe agents), they validate
+     * the DNS-resolved IP at TCP connect time, preventing TOCTOU DNS rebinding attacks.
      */
     const axios = _axios.create({
       maxRedirects: 0,
-      validateStatus: (status) => status >= 200 && status < 400, // Accept 3xx but don't follow
+      validateStatus: (status) => status >= 200 && status < 400,
+      ...(options?.httpAgent != null ? { httpAgent: options.httpAgent } : {}),
+      ...(options?.httpsAgent != null ? { httpsAgent: options.httpsAgent } : {}),
     });
 
     // Initialize separate containers for query and body parameters.
diff --git a/packages/data-provider/src/api-endpoints.ts b/packages/data-provider/src/api-endpoints.ts
index ef7e0d6cfb..db6df32015 100644
--- a/packages/data-provider/src/api-endpoints.ts
+++ b/packages/data-provider/src/api-endpoints.ts
@@ -95,6 +95,12 @@ export const revokeUserKey = (name: string) => `${keysEndpoint}/${name}`;
 
 export const revokeAllUserKeys = () => `${keysEndpoint}?all=true`;
 
+const apiKeysEndpoint = `${BASE_URL}/api/api-keys`;
+
+export const apiKeys = () => apiKeysEndpoint;
+
+export const apiKeyById = (id: string) => `${apiKeysEndpoint}/${id}`;
+
 export const conversationsRoot = `${BASE_URL}/api/convos`;
 
 export const conversations = (params: q.ConversationListParams) => {
@@ -175,6 +181,11 @@ export const cancelMCPOAuth = (serverName: string) => {
   return `${BASE_URL}/api/mcp/oauth/cancel/${serverName}`;
 };
 
+export const mcpOAuthBind = (serverName: string) => `${BASE_URL}/api/mcp/${serverName}/oauth/bind`;
+
+export const actionOAuthBind = (actionId: string) =>
+  `${BASE_URL}/api/actions/${actionId}/oauth/bind`;
+
 export const config = () => `${BASE_URL}/api/config`;
 
 export const prompts = () => `${BASE_URL}/api/prompts`;
@@ -329,6 +340,8 @@ export const updateAgentPermissions = (roleName: string) => `${getRole(roleName)
 export const updatePeoplePickerPermissions = (roleName: string) =>
   `${getRole(roleName)}/people-picker`;
 export const updateMCPServersPermissions = (roleName: string) => `${getRole(roleName)}/mcp-servers`;
+export const updateRemoteAgentsPermissions = (roleName: string) =>
+  `${getRole(roleName)}/remote-agents`;
 
 export const updateMarketplacePermissions = (roleName: string) =>
   `${getRole(roleName)}/marketplace`;
diff --git a/packages/data-provider/src/bedrock.ts b/packages/data-provider/src/bedrock.ts
index b37fdc25e1..54f5c8b23f 100644
--- a/packages/data-provider/src/bedrock.ts
+++ b/packages/data-provider/src/bedrock.ts
@@ -1,10 +1,11 @@
 import { z } from 'zod';
 import * as s from './schemas';
 
-type ThinkingConfig = {
-  type: 'enabled';
-  budget_tokens: number;
-};
+const DEFAULT_ENABLED_MAX_TOKENS = 8192;
+const DEFAULT_THINKING_BUDGET = 2000;
+
+type ThinkingConfig = { type: 'enabled'; budget_tokens: number } | { type: 'adaptive' };
+
 type AnthropicReasoning = {
   thinking?: ThinkingConfig | boolean;
   thinkingBudget?: number;
@@ -15,6 +16,101 @@ type AnthropicInput = BedrockConverseInput & {
     AnthropicReasoning;
 };
 
+/** Extracts opus major/minor version from both naming formats */
+function parseOpusVersion(model: string): { major: number; minor: number } | null {
+  const nameFirst = model.match(/claude-opus[-.]?(\d+)(?:[-.](\d+))?/);
+  if (nameFirst) {
+    return {
+      major: parseInt(nameFirst[1], 10),
+      minor: nameFirst[2] != null ? parseInt(nameFirst[2], 10) : 0,
+    };
+  }
+  const numFirst = model.match(/claude-(\d+)(?:[-.](\d+))?-opus/);
+  if (numFirst) {
+    return {
+      major: parseInt(numFirst[1], 10),
+      minor: numFirst[2] != null ? parseInt(numFirst[2], 10) : 0,
+    };
+  }
+  return null;
+}
+
+/** Extracts sonnet major/minor version from both naming formats.
+ *  Uses single-digit minor capture to avoid matching date suffixes (e.g., -20250514). */
+function parseSonnetVersion(model: string): { major: number; minor: number } | null {
+  const nameFirst = model.match(/claude-sonnet[-.]?(\d+)(?:[-.](\d)(?!\d))?/);
+  if (nameFirst) {
+    return {
+      major: parseInt(nameFirst[1], 10),
+      minor: nameFirst[2] != null ? parseInt(nameFirst[2], 10) : 0,
+    };
+  }
+  const numFirst = model.match(/claude-(\d+)(?:[-.](\d)(?!\d))?-sonnet/);
+  if (numFirst) {
+    return {
+      major: parseInt(numFirst[1], 10),
+      minor: numFirst[2] != null ? parseInt(numFirst[2], 10) : 0,
+    };
+  }
+  return null;
+}
+
+/** Checks if a model supports adaptive thinking (Opus 4.6+, Sonnet 4.6+) */
+export function supportsAdaptiveThinking(model: string): boolean {
+  const opus = parseOpusVersion(model);
+  if (opus && (opus.major > 4 || (opus.major === 4 && opus.minor >= 6))) {
+    return true;
+  }
+  const sonnet = parseSonnetVersion(model);
+  if (sonnet != null && (sonnet.major > 4 || (sonnet.major === 4 && sonnet.minor >= 6))) {
+    return true;
+  }
+  return false;
+}
+
+/** Checks if a model qualifies for the context-1m beta header (Sonnet 4+, Opus 4.6+, Opus 5+) */
+export function supportsContext1m(model: string): boolean {
+  const sonnet = parseSonnetVersion(model);
+  if (sonnet != null && sonnet.major >= 4) {
+    return true;
+  }
+  const opus = parseOpusVersion(model);
+  if (opus && (opus.major > 4 || (opus.major === 4 && opus.minor >= 6))) {
+    return true;
+  }
+  return false;
+}
+
+/**
+ * Gets the appropriate anthropic_beta headers for Bedrock Anthropic models.
+ * Bedrock uses `anthropic_beta` (with underscore) in additionalModelRequestFields.
+ *
+ * @param model - The Bedrock model identifier (e.g., "anthropic.claude-sonnet-4-20250514-v1:0")
+ * @returns Array of beta header strings, or empty array if not applicable
+ */
+function getBedrockAnthropicBetaHeaders(model: string): string[] {
+  const betaHeaders: string[] = [];
+
+  const isClaudeThinkingModel =
+    model.includes('anthropic.claude-3-7-sonnet') ||
+    /anthropic\.claude-(?:[4-9](?:\.\d+)?(?:-\d+)?-(?:sonnet|opus|haiku)|(?:sonnet|opus|haiku)-[4-9])/.test(
+      model,
+    );
+
+  const isSonnet4PlusModel =
+    /anthropic\.claude-(?:sonnet-[4-9]|[4-9](?:\.\d+)?(?:-\d+)?-sonnet)/.test(model);
+
+  if (isClaudeThinkingModel) {
+    betaHeaders.push('output-128k-2025-02-19');
+  }
+
+  if (isSonnet4PlusModel || supportsAdaptiveThinking(model)) {
+    betaHeaders.push('context-1m-2025-08-07');
+  }
+
+  return betaHeaders;
+}
+
 export const bedrockInputSchema = s.tConversationSchema
   .pick({
     /* LibreChat params; optionType: 'conversation' */
@@ -37,6 +133,7 @@ export const bedrockInputSchema = s.tConversationSchema
     stop: true,
     thinking: true,
     thinkingBudget: true,
+    effort: true,
     promptCache: true,
     /* Catch-all fields */
     topK: true,
@@ -45,10 +142,11 @@ export const bedrockInputSchema = s.tConversationSchema
   .transform((obj) => {
     if ((obj as AnthropicInput).additionalModelRequestFields?.thinking != null) {
       const _obj = obj as AnthropicInput;
-      obj.thinking = !!_obj.additionalModelRequestFields.thinking;
+      const thinking = _obj.additionalModelRequestFields.thinking;
+      obj.thinking = !!thinking;
       obj.thinkingBudget =
-        typeof _obj.additionalModelRequestFields.thinking === 'object'
-          ? (_obj.additionalModelRequestFields.thinking as ThinkingConfig)?.budget_tokens
+        typeof thinking === 'object' && 'budget_tokens' in thinking
+          ? thinking.budget_tokens
           : undefined;
       delete obj.additionalModelRequestFields;
     }
@@ -79,6 +177,7 @@ export const bedrockInputParser = s.tConversationSchema
     stop: true,
     thinking: true,
     thinkingBudget: true,
+    effort: true,
     promptCache: true,
     /* Catch-all fields */
     topK: true,
@@ -127,31 +226,77 @@ export const bedrockInputParser = s.tConversationSchema
           typedData.model,
         ))
     ) {
-      if (additionalFields.thinking === undefined) {
-        additionalFields.thinking = true;
-      } else if (additionalFields.thinking === false) {
-        delete additionalFields.thinking;
-        delete additionalFields.thinkingBudget;
+      const isAdaptive = supportsAdaptiveThinking(typedData.model as string);
+
+      if (isAdaptive) {
+        const effort = additionalFields.effort;
+        if (effort && typeof effort === 'string' && effort !== '') {
+          additionalFields.output_config = { effort };
+        }
+        delete additionalFields.effort;
+
+        if (additionalFields.thinking === false) {
+          delete additionalFields.thinking;
+          delete additionalFields.thinkingBudget;
+        } else {
+          additionalFields.thinking = { type: 'adaptive' };
+          delete additionalFields.thinkingBudget;
+        }
+      } else {
+        if (additionalFields.thinking === undefined) {
+          additionalFields.thinking = true;
+        } else if (additionalFields.thinking === false) {
+          delete additionalFields.thinking;
+          delete additionalFields.thinkingBudget;
+        }
+
+        if (additionalFields.thinking === true && additionalFields.thinkingBudget === undefined) {
+          additionalFields.thinkingBudget = DEFAULT_THINKING_BUDGET;
+        }
+        delete additionalFields.effort;
       }
 
-      if (additionalFields.thinking === true && additionalFields.thinkingBudget === undefined) {
-        additionalFields.thinkingBudget = 2000;
+      if ((typedData.model as string).includes('anthropic.')) {
+        const betaHeaders = getBedrockAnthropicBetaHeaders(typedData.model as string);
+        if (betaHeaders.length > 0) {
+          additionalFields.anthropic_beta = betaHeaders;
+        }
       }
-      if (typedData.model.includes('anthropic.')) {
-        additionalFields.anthropic_beta = ['output-128k-2025-02-19'];
-      }
-    } else if (additionalFields.thinking != null || additionalFields.thinkingBudget != null) {
+    } else {
       delete additionalFields.thinking;
       delete additionalFields.thinkingBudget;
+      delete additionalFields.effort;
+      delete additionalFields.output_config;
+      delete additionalFields.anthropic_beta;
+    }
+
+    const isAnthropicModel =
+      typeof typedData.model === 'string' && typedData.model.includes('anthropic.');
+
+    /** Strip stale anthropic_beta from previously-persisted additionalModelRequestFields */
+    if (
+      !isAnthropicModel &&
+      typeof typedData.additionalModelRequestFields === 'object' &&
+      typedData.additionalModelRequestFields != null
+    ) {
+      const amrf = typedData.additionalModelRequestFields as Record<string, unknown>;
+      delete amrf.anthropic_beta;
+      delete amrf.thinking;
+      delete amrf.thinkingBudget;
+      delete amrf.effort;
+      delete amrf.output_config;
     }
 
     /** Default promptCache for claude and nova models, if not defined */
     if (
       typeof typedData.model === 'string' &&
-      (typedData.model.includes('claude') || typedData.model.includes('nova')) &&
-      typedData.promptCache === undefined
+      (typedData.model.includes('claude') || typedData.model.includes('nova'))
     ) {
-      typedData.promptCache = true;
+      if (typedData.promptCache === undefined) {
+        typedData.promptCache = true;
+      }
+    } else if (typedData.promptCache === true) {
+      typedData.promptCache = undefined;
     }
 
     if (Object.keys(additionalFields).length > 0) {
@@ -179,20 +324,35 @@ export const bedrockInputParser = s.tConversationSchema
  */
 function configureThinking(data: AnthropicInput): AnthropicInput {
   const updatedData = { ...data };
-  if (updatedData.additionalModelRequestFields?.thinking === true) {
-    updatedData.maxTokens = updatedData.maxTokens ?? updatedData.maxOutputTokens ?? 8192;
+  const thinking = updatedData.additionalModelRequestFields?.thinking;
+
+  if (thinking === true) {
+    updatedData.maxTokens =
+      updatedData.maxTokens ?? updatedData.maxOutputTokens ?? DEFAULT_ENABLED_MAX_TOKENS;
     delete updatedData.maxOutputTokens;
-    const thinkingConfig: AnthropicReasoning['thinking'] = {
+    const thinkingConfig: ThinkingConfig = {
       type: 'enabled',
-      budget_tokens: updatedData.additionalModelRequestFields.thinkingBudget ?? 2000,
+      budget_tokens:
+        updatedData.additionalModelRequestFields?.thinkingBudget ?? DEFAULT_THINKING_BUDGET,
     };
 
     if (thinkingConfig.budget_tokens > updatedData.maxTokens) {
       thinkingConfig.budget_tokens = Math.floor(updatedData.maxTokens * 0.9);
     }
-    updatedData.additionalModelRequestFields.thinking = thinkingConfig;
-    delete updatedData.additionalModelRequestFields.thinkingBudget;
+    updatedData.additionalModelRequestFields!.thinking = thinkingConfig;
+    delete updatedData.additionalModelRequestFields!.thinkingBudget;
+  } else if (
+    typeof thinking === 'object' &&
+    thinking != null &&
+    (thinking as { type: string }).type === 'adaptive'
+  ) {
+    if (updatedData.maxTokens == null && updatedData.maxOutputTokens != null) {
+      updatedData.maxTokens = updatedData.maxOutputTokens;
+    }
+    delete updatedData.maxOutputTokens;
+    delete updatedData.additionalModelRequestFields!.thinkingBudget;
   }
+
   return updatedData;
 }
 
@@ -235,8 +395,8 @@ export const bedrockOutputParser = (data: Record<string, unknown>) => {
   }
 
   result = configureThinking(result as AnthropicInput);
-  // Remove additionalModelRequestFields from the result if it doesn't thinking config
-  if ((result as AnthropicInput).additionalModelRequestFields?.thinking == null) {
+  const amrf = result.additionalModelRequestFields as Record<string, unknown> | undefined;
+  if (!amrf || Object.keys(amrf).length === 0) {
     delete result.additionalModelRequestFields;
   }
 
diff --git a/packages/data-provider/src/config.ts b/packages/data-provider/src/config.ts
index 1817d973a2..66ca300ef0 100644
--- a/packages/data-provider/src/config.ts
+++ b/packages/data-provider/src/config.ts
@@ -123,7 +123,6 @@ export const azureBaseSchema = z.object({
   assistants: z.boolean().optional(),
   addParams: z.record(z.any()).optional(),
   dropParams: z.array(z.string()).optional(),
-  forcePrompt: z.boolean().optional(),
   version: z.string().optional(),
   baseURL: z.string().optional(),
   additionalHeaders: z.record(z.any()).optional(),
@@ -177,7 +176,9 @@ export enum Capabilities {
 
 export enum AgentCapabilities {
   hide_sequential_outputs = 'hide_sequential_outputs',
+  programmatic_tools = 'programmatic_tools',
   end_after_tools = 'end_after_tools',
+  deferred_tools = 'deferred_tools',
   execute_code = 'execute_code',
   file_search = 'file_search',
   web_search = 'web_search',
@@ -212,6 +213,8 @@ export type TBaseEndpoint = z.infer<typeof baseEndpointSchema>;
 export const bedrockEndpointSchema = baseEndpointSchema.merge(
   z.object({
     availableRegions: z.array(z.string()).optional(),
+    models: z.array(z.string()).optional(),
+    inferenceProfiles: z.record(z.string(), z.string()).optional(),
   }),
 );
 
@@ -260,6 +263,9 @@ export const assistantEndpointSchema = baseEndpointSchema.merge(
 export type TAssistantEndpoint = z.infer<typeof assistantEndpointSchema>;
 
 export const defaultAgentCapabilities = [
+  // Commented as requires latest Code Interpreter API
+  // AgentCapabilities.programmatic_tools,
+  AgentCapabilities.deferred_tools,
   AgentCapabilities.execute_code,
   AgentCapabilities.file_search,
   AgentCapabilities.web_search,
@@ -315,7 +321,6 @@ export const endpointSchema = baseEndpointSchema.merge(
     summarize: z.boolean().optional(),
     summaryModel: z.string().optional(),
     iconURL: z.string().optional(),
-    forcePrompt: z.boolean().optional(),
     modelDisplayLabel: z.string().optional(),
     headers: z.record(z.any()).optional(),
     addParams: z.record(z.any()).optional(),
@@ -632,6 +637,7 @@ export const interfaceSchema = z
         z.boolean(),
         z.object({
           use: z.boolean().optional(),
+          create: z.boolean().optional(),
           share: z.boolean().optional(),
           public: z.boolean().optional(),
         }),
@@ -642,6 +648,7 @@ export const interfaceSchema = z
         z.boolean(),
         z.object({
           use: z.boolean().optional(),
+          create: z.boolean().optional(),
           share: z.boolean().optional(),
           public: z.boolean().optional(),
         }),
@@ -665,6 +672,14 @@ export const interfaceSchema = z
       .optional(),
     fileSearch: z.boolean().optional(),
     fileCitations: z.boolean().optional(),
+    remoteAgents: z
+      .object({
+        use: z.boolean().optional(),
+        create: z.boolean().optional(),
+        share: z.boolean().optional(),
+        public: z.boolean().optional(),
+      })
+      .optional(),
   })
   .default({
     endpointsMenu: true,
@@ -677,11 +692,13 @@ export const interfaceSchema = z
     memories: true,
     prompts: {
       use: true,
+      create: true,
       share: false,
       public: false,
     },
     agents: {
       use: true,
+      create: true,
       share: false,
       public: false,
     },
@@ -704,6 +721,12 @@ export const interfaceSchema = z
     },
     fileSearch: true,
     fileCitations: true,
+    remoteAgents: {
+      use: false,
+      create: false,
+      share: false,
+      public: false,
+    },
   });
 
 export type TInterfaceConfig = z.infer<typeof interfaceSchema>;
@@ -990,7 +1013,7 @@ export const configSchema = z.object({
       [EModelEndpoint.assistants]: assistantEndpointSchema.optional(),
       [EModelEndpoint.agents]: agentsEndpointSchema.optional(),
       [EModelEndpoint.custom]: customEndpointsSchema.optional(),
-      [EModelEndpoint.bedrock]: baseEndpointSchema.optional(),
+      [EModelEndpoint.bedrock]: bedrockEndpointSchema.optional(),
     })
     .strict()
     .refine((data) => Object.keys(data).length > 0, {
@@ -1034,6 +1057,7 @@ export enum KnownEndpoints {
   cohere = 'cohere',
   fireworks = 'fireworks',
   deepseek = 'deepseek',
+  moonshot = 'moonshot',
   groq = 'groq',
   helicone = 'helicone',
   huggingface = 'huggingface',
@@ -1078,6 +1102,7 @@ export const alternateName = {
   [EModelEndpoint.bedrock]: 'AWS Bedrock',
   [KnownEndpoints.ollama]: 'Ollama',
   [KnownEndpoints.deepseek]: 'DeepSeek',
+  [KnownEndpoints.moonshot]: 'Moonshot',
   [KnownEndpoints.xai]: 'xAI',
   [KnownEndpoints.vercel]: 'Vercel',
   [KnownEndpoints.helicone]: 'Helicone',
@@ -1117,6 +1142,8 @@ const sharedOpenAIModels = [
 ];
 
 const sharedAnthropicModels = [
+  'claude-sonnet-4-6',
+  'claude-opus-4-6',
   'claude-sonnet-4-5',
   'claude-sonnet-4-5-20250929',
   'claude-haiku-4-5',
@@ -1134,31 +1161,17 @@ const sharedAnthropicModels = [
   'claude-3-5-sonnet-20241022',
   'claude-3-5-sonnet-20240620',
   'claude-3-5-sonnet-latest',
-  'claude-3-opus-20240229',
-  'claude-3-sonnet-20240229',
-  'claude-3-haiku-20240307',
-  'claude-2.1',
-  'claude-2',
-  'claude-1.2',
-  'claude-1',
-  'claude-1-100k',
-  'claude-instant-1',
-  'claude-instant-1-100k',
 ];
 
 export const bedrockModels = [
+  'anthropic.claude-sonnet-4-6',
+  'anthropic.claude-opus-4-6-v1',
   'anthropic.claude-sonnet-4-5-20250929-v1:0',
   'anthropic.claude-haiku-4-5-20251001-v1:0',
   'anthropic.claude-opus-4-1-20250805-v1:0',
   'anthropic.claude-3-5-sonnet-20241022-v2:0',
   'anthropic.claude-3-5-sonnet-20240620-v1:0',
   'anthropic.claude-3-5-haiku-20241022-v1:0',
-  'anthropic.claude-3-haiku-20240307-v1:0',
-  'anthropic.claude-3-opus-20240229-v1:0',
-  'anthropic.claude-3-sonnet-20240229-v1:0',
-  'anthropic.claude-v2',
-  'anthropic.claude-v2:1',
-  'anthropic.claude-instant-v1',
   // 'cohere.command-text-v14', // no conversation history
   // 'cohere.command-light-text-v14', // no conversation history
   'cohere.command-r-v1:0',
@@ -1362,6 +1375,10 @@ export enum CacheKeys {
    * Key for the config store namespace.
    */
   CONFIG_STORE = 'CONFIG_STORE',
+  /**
+   * Key for the tool cache namespace (plugins, MCP tools, tool definitions).
+   */
+  TOOL_CACHE = 'TOOL_CACHE',
   /**
    * Key for the roles cache.
    */
@@ -1443,6 +1460,10 @@ export enum CacheKeys {
    * Key for SAML session.
    */
   SAML_SESSION = 'SAML_SESSION',
+  /**
+   * Key for admin panel OAuth exchange codes (one-time-use, short TTL).
+   */
+  ADMIN_OAUTH_EXCHANGE = 'ADMIN_OAUTH_EXCHANGE',
 }
 
 /**
@@ -1711,9 +1732,9 @@ export enum TTSProviders {
 /** Enum for app-wide constants */
 export enum Constants {
   /** Key for the app's version. */
-  VERSION = 'v0.8.2-rc2',
+  VERSION = 'v0.8.2',
   /** Key for the Custom Config's version (librechat.yaml). */
-  CONFIG_VERSION = '1.3.1',
+  CONFIG_VERSION = '1.3.3',
   /** Standard value for the first message's `parentMessageId` value, to indicate no parent exists. */
   NO_PARENT = '00000000-0000-0000-0000-000000000000',
   /** Standard value to use whatever the submission prelim. `responseMessageId` is */
@@ -1748,6 +1769,8 @@ export enum Constants {
   mcp_all = 'sys__all__sys',
   /** Unique value to indicate clearing MCP servers from UI state. For frontend use only. */
   mcp_clear = 'sys__clear__sys',
+  /** Key suffix for non-spec user default tool storage */
+  spec_defaults_key = '__defaults__',
   /**
    * Unique value to indicate the MCP tool was added to an agent.
    * This helps inform the UI if the mcp server was previously added.
@@ -1759,6 +1782,8 @@ export enum Constants {
   LC_TRANSFER_TO_ = 'lc_transfer_to_',
   /** Placeholder Agent ID for Ephemeral Agents */
   EPHEMERAL_AGENT_ID = 'ephemeral',
+  /** Programmatic Tool Calling tool name */
+  PROGRAMMATIC_TOOL_CALLING = 'run_tools_with_code',
 }
 
 export enum LocalStorageKeys {
@@ -1896,3 +1921,14 @@ export function getEndpointField<
   }
   return config[property];
 }
+
+/** Resolves the `defaultParamsEndpoint` for a given endpoint from its custom params config */
+export function getDefaultParamsEndpoint(
+  endpointsConfig: TEndpointsConfig | undefined | null,
+  endpoint: string | null | undefined,
+): string | undefined {
+  if (!endpointsConfig || !endpoint) {
+    return undefined;
+  }
+  return endpointsConfig[endpoint]?.customParams?.defaultParamsEndpoint;
+}
diff --git a/packages/data-provider/src/data-service.ts b/packages/data-provider/src/data-service.ts
index 911cc7863c..be5cccd43b 100644
--- a/packages/data-provider/src/data-service.ts
+++ b/packages/data-provider/src/data-service.ts
@@ -81,6 +81,20 @@ export function updateUserKey(payload: t.TUpdateUserKeyRequest) {
   return request.put(endpoints.keys(), payload);
 }
 
+export function getAgentApiKeys(): Promise<t.TAgentApiKeyListResponse> {
+  return request.get(endpoints.apiKeys());
+}
+
+export function createAgentApiKey(
+  payload: t.TAgentApiKeyCreateRequest,
+): Promise<t.TAgentApiKeyCreateResponse> {
+  return request.post(endpoints.apiKeys(), payload);
+}
+
+export function deleteAgentApiKey(id: string): Promise<void> {
+  return request.delete(endpoints.apiKeyById(id));
+}
+
 export function getPresets(): Promise<s.TPreset[]> {
   return request.get(endpoints.presets());
 }
@@ -164,6 +178,14 @@ export const reinitializeMCPServer = (serverName: string) => {
   return request.post(endpoints.mcpReinitialize(serverName));
 };
 
+export const bindMCPOAuth = (serverName: string): Promise<{ success: boolean }> => {
+  return request.post(endpoints.mcpOAuthBind(serverName));
+};
+
+export const bindActionOAuth = (actionId: string): Promise<{ success: boolean }> => {
+  return request.post(endpoints.actionOAuthBind(actionId));
+};
+
 export const getMCPConnectionStatus = (): Promise<q.MCPConnectionStatusResponse> => {
   return request.get(endpoints.mcpConnectionStatus());
 };
@@ -877,6 +899,15 @@ export function updateMCPServersPermissions(
   return request.put(endpoints.updateMCPServersPermissions(variables.roleName), variables.updates);
 }
 
+export function updateRemoteAgentsPermissions(
+  variables: m.UpdateRemoteAgentsPermVars,
+): Promise<m.UpdatePermResponse> {
+  return request.put(
+    endpoints.updateRemoteAgentsPermissions(variables.roleName),
+    variables.updates,
+  );
+}
+
 export function updateMarketplacePermissions(
   variables: m.UpdateMarketplacePermVars,
 ): Promise<m.UpdatePermResponse> {
diff --git a/packages/data-provider/src/file-config.ts b/packages/data-provider/src/file-config.ts
index 8dc3445be0..98254390b9 100644
--- a/packages/data-provider/src/file-config.ts
+++ b/packages/data-provider/src/file-config.ts
@@ -60,6 +60,7 @@ export const fullMimeTypesList = [
   'application/vnd.coffeescript',
   'application/xml',
   'application/zip',
+  'application/x-parquet',
   'image/svg',
   'image/svg+xml',
   // Video formats
@@ -114,6 +115,7 @@ export const codeInterpreterMimeTypesList = [
   'application/typescript',
   'application/xml',
   'application/zip',
+  'application/x-parquet',
   ...excelFileTypes,
 ];
 
@@ -144,7 +146,7 @@ export const textMimeTypes =
   /^(text\/(x-c|x-csharp|tab-separated-values|x-c\+\+|x-h|x-java|html|markdown|x-php|x-python|x-script\.python|x-ruby|x-tex|plain|css|vtt|javascript|csv|xml))$/;
 
 export const applicationMimeTypes =
-  /^(application\/(epub\+zip|csv|json|pdf|x-tar|x-sh|typescript|sql|yaml|vnd\.coffeescript|vnd\.openxmlformats-officedocument\.(wordprocessingml\.document|presentationml\.presentation|spreadsheetml\.sheet)|xml|zip))$/;
+  /^(application\/(epub\+zip|csv|json|pdf|x-tar|x-sh|typescript|sql|yaml|x-parquet|vnd\.apache\.parquet|vnd\.coffeescript|vnd\.openxmlformats-officedocument\.(wordprocessingml\.document|presentationml\.presentation|spreadsheetml\.sheet)|xml|zip))$/;
 
 export const imageMimeTypes = /^image\/(jpeg|gif|png|webp|heic|heif)$/;
 
@@ -198,8 +200,16 @@ export const codeTypeMapping: { [key: string]: string } = {
   ts: 'application/typescript', // .ts - TypeScript source
   tar: 'application/x-tar', // .tar - Tar archive
   zip: 'application/zip', // .zip - ZIP archive
+  txt: 'text/plain', // .txt - Plain text file
   log: 'text/plain', // .log - Log file
+  csv: 'text/csv', // .csv - Comma-separated values
   tsv: 'text/tab-separated-values', // .tsv - Tab-separated values
+  parquet: 'application/x-parquet', // .parquet - Apache Parquet columnar storage
+  json: 'application/json', // .json - JSON file
+  xml: 'application/xml', // .xml - XML file
+  html: 'text/html', // .html - HTML file
+  htm: 'text/html', // .htm - HTML file
+  css: 'text/css', // .css - CSS file
   yml: 'application/yaml', // .yml - YAML
   yaml: 'application/yaml', // .yaml - YAML
   sql: 'application/sql', // .sql - SQL (IANA registered)
diff --git a/packages/data-provider/src/keys.ts b/packages/data-provider/src/keys.ts
index 235baf4ebe..a5e67878ed 100644
--- a/packages/data-provider/src/keys.ts
+++ b/packages/data-provider/src/keys.ts
@@ -62,6 +62,8 @@ export enum QueryKeys {
   mcpServer = 'mcpServer',
   /* Active Jobs */
   activeJobs = 'activeJobs',
+  /* Agent API Keys */
+  agentApiKeys = 'agentApiKeys',
 }
 
 // Dynamic query keys that require parameters
@@ -70,6 +72,8 @@ export const DynamicQueryKeys = {
 } as const;
 
 export enum MutationKeys {
+  createAgentApiKey = 'createAgentApiKey',
+  deleteAgentApiKey = 'deleteAgentApiKey',
   fileUpload = 'fileUpload',
   fileDelete = 'fileDelete',
   updatePreset = 'updatePreset',
diff --git a/packages/data-provider/src/models.ts b/packages/data-provider/src/models.ts
index 3c3c197660..c2dbe2cf77 100644
--- a/packages/data-provider/src/models.ts
+++ b/packages/data-provider/src/models.ts
@@ -35,6 +35,7 @@ export type TModelSpec = {
   webSearch?: boolean;
   fileSearch?: boolean;
   executeCode?: boolean;
+  artifacts?: string | boolean;
   mcpServers?: string[];
 };
 
@@ -54,6 +55,7 @@ export const tModelSpecSchema = z.object({
   webSearch: z.boolean().optional(),
   fileSearch: z.boolean().optional(),
   executeCode: z.boolean().optional(),
+  artifacts: z.union([z.string(), z.boolean()]).optional(),
   mcpServers: z.array(z.string()).optional(),
 });
 
diff --git a/packages/data-provider/src/parameterSettings.ts b/packages/data-provider/src/parameterSettings.ts
index ae811d3d5b..0796efe773 100644
--- a/packages/data-provider/src/parameterSettings.ts
+++ b/packages/data-provider/src/parameterSettings.ts
@@ -5,6 +5,7 @@ import {
   openAISettings,
   googleSettings,
   ReasoningEffort,
+  AnthropicEffort,
   ReasoningSummary,
   BedrockProviders,
   anthropicSettings,
@@ -445,6 +446,26 @@ const anthropic: Record<string, SettingDefinition> = {
     showDefault: false,
     columnSpan: 2,
   },
+  effort: {
+    key: 'effort',
+    label: 'com_endpoint_effort',
+    labelCode: true,
+    description: 'com_endpoint_anthropic_effort',
+    descriptionCode: true,
+    type: 'enum',
+    default: anthropicSettings.effort.default,
+    component: 'slider',
+    options: anthropicSettings.effort.options,
+    enumMappings: {
+      [AnthropicEffort.unset]: 'com_ui_auto',
+      [AnthropicEffort.low]: 'com_ui_low',
+      [AnthropicEffort.medium]: 'com_ui_medium',
+      [AnthropicEffort.high]: 'com_ui_high',
+      [AnthropicEffort.max]: 'com_ui_max',
+    },
+    optionType: 'model',
+    columnSpan: 4,
+  },
 };
 
 const bedrock: Record<string, SettingDefinition> = {
@@ -734,6 +755,7 @@ const anthropicConfig: SettingsConfiguration = [
   anthropic.promptCache,
   anthropic.thinking,
   anthropic.thinkingBudget,
+  anthropic.effort,
   anthropic.web_search,
   librechat.fileTokenLimit,
 ];
@@ -754,6 +776,7 @@ const anthropicCol2: SettingsConfiguration = [
   anthropic.promptCache,
   anthropic.thinking,
   anthropic.thinkingBudget,
+  anthropic.effort,
   anthropic.web_search,
   librechat.fileTokenLimit,
 ];
@@ -772,6 +795,7 @@ const bedrockAnthropic: SettingsConfiguration = [
   bedrock.promptCache,
   anthropic.thinking,
   anthropic.thinkingBudget,
+  anthropic.effort,
   librechat.fileTokenLimit,
 ];
 
@@ -829,6 +853,7 @@ const bedrockAnthropicCol2: SettingsConfiguration = [
   bedrock.promptCache,
   anthropic.thinking,
   anthropic.thinkingBudget,
+  anthropic.effort,
   librechat.fileTokenLimit,
 ];
 
@@ -927,6 +952,9 @@ export const paramSettings: Record<string, SettingsConfiguration | undefined> =
   [`${EModelEndpoint.bedrock}-${BedrockProviders.Amazon}`]: bedrockGeneral,
   [`${EModelEndpoint.bedrock}-${BedrockProviders.DeepSeek}`]: bedrockGeneral,
   [`${EModelEndpoint.bedrock}-${BedrockProviders.Moonshot}`]: bedrockMoonshot,
+  [`${EModelEndpoint.bedrock}-${BedrockProviders.MoonshotAI}`]: bedrockMoonshot,
+  [`${EModelEndpoint.bedrock}-${BedrockProviders.OpenAI}`]: bedrockGeneral,
+  [`${EModelEndpoint.bedrock}-${BedrockProviders.ZAI}`]: bedrockGeneral,
   [EModelEndpoint.google]: googleConfig,
 };
 
@@ -975,6 +1003,12 @@ export const presetSettings: Record<
     col1: bedrockMoonshotCol1,
     col2: bedrockMoonshotCol2,
   },
+  [`${EModelEndpoint.bedrock}-${BedrockProviders.MoonshotAI}`]: {
+    col1: bedrockMoonshotCol1,
+    col2: bedrockMoonshotCol2,
+  },
+  [`${EModelEndpoint.bedrock}-${BedrockProviders.OpenAI}`]: bedrockGeneralColumns,
+  [`${EModelEndpoint.bedrock}-${BedrockProviders.ZAI}`]: bedrockGeneralColumns,
   [EModelEndpoint.google]: {
     col1: googleCol1,
     col2: googleCol2,
diff --git a/packages/data-provider/src/parsers.ts b/packages/data-provider/src/parsers.ts
index 85b22e7068..ab6ff927f7 100644
--- a/packages/data-provider/src/parsers.ts
+++ b/packages/data-provider/src/parsers.ts
@@ -144,26 +144,25 @@ export const parseConvo = ({
   endpointType,
   conversation,
   possibleValues,
+  defaultParamsEndpoint,
 }: {
   endpoint: EndpointSchemaKey;
   endpointType?: EndpointSchemaKey | null;
   conversation: Partial<s.TConversation | s.TPreset> | null;
   possibleValues?: TPossibleValues;
-  // TODO: POC for default schema
-  // defaultSchema?: Partial<EndpointSchema>,
+  defaultParamsEndpoint?: string | null;
 }) => {
   let schema = endpointSchemas[endpoint] as EndpointSchema | undefined;
 
   if (!schema && !endpointType) {
     throw new Error(`Unknown endpoint: ${endpoint}`);
-  } else if (!schema && endpointType) {
-    schema = endpointSchemas[endpointType];
+  } else if (!schema) {
+    const overrideSchema = defaultParamsEndpoint
+      ? endpointSchemas[defaultParamsEndpoint as EndpointSchemaKey]
+      : undefined;
+    schema = overrideSchema ?? (endpointType ? endpointSchemas[endpointType] : undefined);
   }
 
-  // if (defaultSchema && schemaCreators[endpoint]) {
-  //   schema = schemaCreators[endpoint](defaultSchema);
-  // }
-
   const convo = schema?.parse(conversation) as s.TConversation | undefined;
   const { models } = possibleValues ?? {};
 
@@ -227,6 +226,10 @@ export const getResponseSender = (endpointOption: Partial<t.TEndpointOption>): s
       return 'Mistral';
     } else if (model && model.includes('deepseek')) {
       return 'Deepseek';
+    } else if (model && model.includes('kimi')) {
+      return 'Kimi';
+    } else if (model && model.includes('moonshot')) {
+      return 'Moonshot';
     } else if (model && model.includes('gpt-')) {
       const gptVersion = extractGPTVersion(model);
       return gptVersion || 'GPT';
@@ -264,6 +267,10 @@ export const getResponseSender = (endpointOption: Partial<t.TEndpointOption>): s
       return 'Mistral';
     } else if (model && model.includes('deepseek')) {
       return 'Deepseek';
+    } else if (model && model.includes('kimi')) {
+      return 'Kimi';
+    } else if (model && model.includes('moonshot')) {
+      return 'Moonshot';
     } else if (model && model.includes('gpt-')) {
       const gptVersion = extractGPTVersion(model);
       return gptVersion || 'GPT';
@@ -302,13 +309,13 @@ export const parseCompactConvo = ({
   endpointType,
   conversation,
   possibleValues,
+  defaultParamsEndpoint,
 }: {
   endpoint?: EndpointSchemaKey;
   endpointType?: EndpointSchemaKey | null;
   conversation: Partial<s.TConversation | s.TPreset>;
   possibleValues?: TPossibleValues;
-  // TODO: POC for default schema
-  // defaultSchema?: Partial<EndpointSchema>,
+  defaultParamsEndpoint?: string | null;
 }): Omit<s.TConversation, 'iconURL'> | null => {
   if (!endpoint) {
     throw new Error(`undefined endpoint: ${endpoint}`);
@@ -318,8 +325,11 @@ export const parseCompactConvo = ({
 
   if (!schema && !endpointType) {
     throw new Error(`Unknown endpoint: ${endpoint}`);
-  } else if (!schema && endpointType) {
-    schema = compactEndpointSchemas[endpointType];
+  } else if (!schema) {
+    const overrideSchema = defaultParamsEndpoint
+      ? compactEndpointSchemas[defaultParamsEndpoint as EndpointSchemaKey]
+      : undefined;
+    schema = overrideSchema ?? (endpointType ? compactEndpointSchemas[endpointType] : undefined);
   }
 
   if (!schema) {
@@ -341,13 +351,13 @@ export const parseCompactConvo = ({
 };
 
 export function parseTextParts(
-  contentParts: a.TMessageContentParts[],
+  contentParts: Array<a.TMessageContentParts | undefined>,
   skipReasoning: boolean = false,
 ): string {
   let result = '';
 
   for (const part of contentParts) {
-    if (!part.type) {
+    if (!part?.type) {
       continue;
     }
     if (part.type === ContentTypes.TEXT) {
diff --git a/packages/data-provider/src/permissions.ts b/packages/data-provider/src/permissions.ts
index 0d53dbe29b..7a3144c82d 100644
--- a/packages/data-provider/src/permissions.ts
+++ b/packages/data-provider/src/permissions.ts
@@ -56,6 +56,10 @@ export enum PermissionTypes {
    * Type for MCP Server Permissions
    */
   MCP_SERVERS = 'MCP_SERVERS',
+  /**
+   * Type for Remote Agent (API) Permissions
+   */
+  REMOTE_AGENTS = 'REMOTE_AGENTS',
 }
 
 /**
@@ -157,6 +161,14 @@ export const mcpServersPermissionsSchema = z.object({
 });
 export type TMcpServersPermissions = z.infer<typeof mcpServersPermissionsSchema>;
 
+export const remoteAgentsPermissionsSchema = z.object({
+  [Permissions.USE]: z.boolean().default(false),
+  [Permissions.CREATE]: z.boolean().default(false),
+  [Permissions.SHARE]: z.boolean().default(false),
+  [Permissions.SHARE_PUBLIC]: z.boolean().default(false),
+});
+export type TRemoteAgentsPermissions = z.infer<typeof remoteAgentsPermissionsSchema>;
+
 // Define a single permissions schema that holds all permission types.
 export const permissionsSchema = z.object({
   [PermissionTypes.PROMPTS]: promptPermissionsSchema,
@@ -172,4 +184,5 @@ export const permissionsSchema = z.object({
   [PermissionTypes.FILE_SEARCH]: fileSearchPermissionsSchema,
   [PermissionTypes.FILE_CITATIONS]: fileCitationsPermissionsSchema,
   [PermissionTypes.MCP_SERVERS]: mcpServersPermissionsSchema,
+  [PermissionTypes.REMOTE_AGENTS]: remoteAgentsPermissionsSchema,
 });
diff --git a/packages/data-provider/src/react-query/react-query-service.ts b/packages/data-provider/src/react-query/react-query-service.ts
index cd259fb50c..9d08d9d56a 100644
--- a/packages/data-provider/src/react-query/react-query-service.ts
+++ b/packages/data-provider/src/react-query/react-query-service.ts
@@ -524,3 +524,43 @@ export const useMCPServerConnectionStatusQuery = (
     },
   );
 };
+
+export const useGetAgentApiKeysQuery = (
+  config?: UseQueryOptions<t.TAgentApiKeyListResponse>,
+): QueryObserverResult<t.TAgentApiKeyListResponse> => {
+  return useQuery<t.TAgentApiKeyListResponse>(
+    [QueryKeys.agentApiKeys],
+    () => dataService.getAgentApiKeys(),
+    {
+      refetchOnWindowFocus: false,
+      refetchOnReconnect: false,
+      refetchOnMount: false,
+      ...config,
+    },
+  );
+};
+
+export const useCreateAgentApiKeyMutation = (): UseMutationResult<
+  t.TAgentApiKeyCreateResponse,
+  unknown,
+  t.TAgentApiKeyCreateRequest
+> => {
+  const queryClient = useQueryClient();
+  return useMutation(
+    (payload: t.TAgentApiKeyCreateRequest) => dataService.createAgentApiKey(payload),
+    {
+      onSuccess: () => {
+        queryClient.invalidateQueries([QueryKeys.agentApiKeys]);
+      },
+    },
+  );
+};
+
+export const useDeleteAgentApiKeyMutation = (): UseMutationResult<void, unknown, string> => {
+  const queryClient = useQueryClient();
+  return useMutation((id: string) => dataService.deleteAgentApiKey(id), {
+    onSuccess: () => {
+      queryClient.invalidateQueries([QueryKeys.agentApiKeys]);
+    },
+  });
+};
diff --git a/packages/data-provider/src/roles.ts b/packages/data-provider/src/roles.ts
index b3d44a49d9..b494ee5817 100644
--- a/packages/data-provider/src/roles.ts
+++ b/packages/data-provider/src/roles.ts
@@ -11,10 +11,11 @@ import {
   webSearchPermissionsSchema,
   fileSearchPermissionsSchema,
   multiConvoPermissionsSchema,
-  temporaryChatPermissionsSchema,
-  peoplePickerPermissionsSchema,
-  fileCitationsPermissionsSchema,
   mcpServersPermissionsSchema,
+  peoplePickerPermissionsSchema,
+  remoteAgentsPermissionsSchema,
+  temporaryChatPermissionsSchema,
+  fileCitationsPermissionsSchema,
 } from './permissions';
 
 /**
@@ -96,6 +97,12 @@ const defaultRolesSchema = z.object({
         [Permissions.SHARE]: z.boolean().default(true),
         [Permissions.SHARE_PUBLIC]: z.boolean().default(true),
       }),
+      [PermissionTypes.REMOTE_AGENTS]: remoteAgentsPermissionsSchema.extend({
+        [Permissions.USE]: z.boolean().default(true),
+        [Permissions.CREATE]: z.boolean().default(true),
+        [Permissions.SHARE]: z.boolean().default(true),
+        [Permissions.SHARE_PUBLIC]: z.boolean().default(true),
+      }),
     }),
   }),
   [SystemRoles.USER]: roleSchema.extend({
@@ -162,6 +169,12 @@ export const roleDefaults = defaultRolesSchema.parse({
         [Permissions.SHARE]: true,
         [Permissions.SHARE_PUBLIC]: true,
       },
+      [PermissionTypes.REMOTE_AGENTS]: {
+        [Permissions.USE]: true,
+        [Permissions.CREATE]: true,
+        [Permissions.SHARE]: true,
+        [Permissions.SHARE_PUBLIC]: true,
+      },
     },
   },
   [SystemRoles.USER]: {
@@ -186,6 +199,7 @@ export const roleDefaults = defaultRolesSchema.parse({
       [PermissionTypes.FILE_SEARCH]: {},
       [PermissionTypes.FILE_CITATIONS]: {},
       [PermissionTypes.MCP_SERVERS]: {},
+      [PermissionTypes.REMOTE_AGENTS]: {},
     },
   },
 });
diff --git a/packages/data-provider/src/schemas.spec.ts b/packages/data-provider/src/schemas.spec.ts
index 02a9fa2b01..db7d370606 100644
--- a/packages/data-provider/src/schemas.spec.ts
+++ b/packages/data-provider/src/schemas.spec.ts
@@ -74,81 +74,83 @@ describe('anthropicSettings', () => {
       });
     });
 
-    describe('Claude Opus 4.5+ models (64K limit - future-proof)', () => {
+    describe('Claude Opus 4.5 models (64K limit)', () => {
       it('should return 64K for claude-opus-4-5', () => {
         expect(reset('claude-opus-4-5')).toBe(64000);
       });
 
-      it('should return 64K for claude-opus-4-6', () => {
-        expect(reset('claude-opus-4-6')).toBe(64000);
-      });
-
-      it('should return 64K for claude-opus-4-7', () => {
-        expect(reset('claude-opus-4-7')).toBe(64000);
-      });
-
-      it('should return 64K for claude-opus-4-8', () => {
-        expect(reset('claude-opus-4-8')).toBe(64000);
-      });
-
-      it('should return 64K for claude-opus-4-9', () => {
-        expect(reset('claude-opus-4-9')).toBe(64000);
-      });
-
       it('should return 64K for claude-opus-4.5', () => {
         expect(reset('claude-opus-4.5')).toBe(64000);
       });
+    });
 
-      it('should return 64K for claude-opus-4.6', () => {
-        expect(reset('claude-opus-4.6')).toBe(64000);
+    describe('Claude Opus 4.6+ models (128K limit - future-proof)', () => {
+      it('should return 128K for claude-opus-4-6', () => {
+        expect(reset('claude-opus-4-6')).toBe(128000);
+      });
+
+      it('should return 128K for claude-opus-4.6', () => {
+        expect(reset('claude-opus-4.6')).toBe(128000);
+      });
+
+      it('should return 128K for claude-opus-4-7', () => {
+        expect(reset('claude-opus-4-7')).toBe(128000);
+      });
+
+      it('should return 128K for claude-opus-4-8', () => {
+        expect(reset('claude-opus-4-8')).toBe(128000);
+      });
+
+      it('should return 128K for claude-opus-4-9', () => {
+        expect(reset('claude-opus-4-9')).toBe(128000);
       });
     });
 
     describe('Claude Opus 4.10+ models (double-digit minor versions)', () => {
-      it('should return 64K for claude-opus-4-10', () => {
-        expect(reset('claude-opus-4-10')).toBe(64000);
+      it('should return 128K for claude-opus-4-10', () => {
+        expect(reset('claude-opus-4-10')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-4-11', () => {
-        expect(reset('claude-opus-4-11')).toBe(64000);
+      it('should return 128K for claude-opus-4-11', () => {
+        expect(reset('claude-opus-4-11')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-4-15', () => {
-        expect(reset('claude-opus-4-15')).toBe(64000);
+      it('should return 128K for claude-opus-4-15', () => {
+        expect(reset('claude-opus-4-15')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-4-20', () => {
-        expect(reset('claude-opus-4-20')).toBe(64000);
+      it('should return 128K for claude-opus-4-20', () => {
+        expect(reset('claude-opus-4-20')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-4.10', () => {
-        expect(reset('claude-opus-4.10')).toBe(64000);
+      it('should return 128K for claude-opus-4.10', () => {
+        expect(reset('claude-opus-4.10')).toBe(128000);
       });
     });
 
     describe('Claude Opus 5+ models (future major versions)', () => {
-      it('should return 64K for claude-opus-5', () => {
-        expect(reset('claude-opus-5')).toBe(64000);
+      it('should return 128K for claude-opus-5', () => {
+        expect(reset('claude-opus-5')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-6', () => {
-        expect(reset('claude-opus-6')).toBe(64000);
+      it('should return 128K for claude-opus-6', () => {
+        expect(reset('claude-opus-6')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-7', () => {
-        expect(reset('claude-opus-7')).toBe(64000);
+      it('should return 128K for claude-opus-7', () => {
+        expect(reset('claude-opus-7')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-9', () => {
-        expect(reset('claude-opus-9')).toBe(64000);
+      it('should return 128K for claude-opus-9', () => {
+        expect(reset('claude-opus-9')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-5-0', () => {
-        expect(reset('claude-opus-5-0')).toBe(64000);
+      it('should return 128K for claude-opus-5-0', () => {
+        expect(reset('claude-opus-5-0')).toBe(128000);
       });
 
-      it('should return 64K for claude-opus-5.0', () => {
-        expect(reset('claude-opus-5.0')).toBe(64000);
+      it('should return 128K for claude-opus-5.0', () => {
+        expect(reset('claude-opus-5.0')).toBe(128000);
       });
     });
 
@@ -157,8 +159,8 @@ describe('anthropicSettings', () => {
         expect(reset('claude-opus-4-5-20250420')).toBe(64000);
       });
 
-      it('should return 64K for claude-opus-4-6-20260101', () => {
-        expect(reset('claude-opus-4-6-20260101')).toBe(64000);
+      it('should return 128K for claude-opus-4-6-20260101', () => {
+        expect(reset('claude-opus-4-6-20260101')).toBe(128000);
       });
 
       it('should return 32K for claude-opus-4-1-20250805', () => {
@@ -234,8 +236,8 @@ describe('anthropicSettings', () => {
 
       it('should match claude-opus45 (no separator after opus)', () => {
         // The regex allows optional separators, so "45" can follow directly
-        // In practice, Anthropic uses separators, but regex is permissive
-        expect(reset('claude-opus45')).toBe(64000);
+        // "45" is treated as major version 45 (>= 5), so it gets 128K
+        expect(reset('claude-opus45')).toBe(128000);
       });
     });
   });
@@ -278,16 +280,28 @@ describe('anthropicSettings', () => {
         expect(set(50000, 'claude-opus-4-5')).toBe(50000);
       });
 
-      it('should cap at 64K for claude-opus-4-6', () => {
-        expect(set(80000, 'claude-opus-4-6')).toBe(64000);
+      it('should allow 80K for claude-opus-4-6 (128K cap)', () => {
+        expect(set(80000, 'claude-opus-4-6')).toBe(80000);
       });
 
-      it('should cap at 64K for claude-opus-5', () => {
-        expect(set(100000, 'claude-opus-5')).toBe(64000);
+      it('should cap at 128K for claude-opus-4-6', () => {
+        expect(set(150000, 'claude-opus-4-6')).toBe(128000);
       });
 
-      it('should cap at 64K for claude-opus-4-10', () => {
-        expect(set(100000, 'claude-opus-4-10')).toBe(64000);
+      it('should cap at 128K for claude-opus-5', () => {
+        expect(set(150000, 'claude-opus-5')).toBe(128000);
+      });
+
+      it('should allow 100K for claude-opus-5', () => {
+        expect(set(100000, 'claude-opus-5')).toBe(100000);
+      });
+
+      it('should cap at 128K for claude-opus-4-10', () => {
+        expect(set(150000, 'claude-opus-4-10')).toBe(128000);
+      });
+
+      it('should allow 100K for claude-opus-4-10', () => {
+        expect(set(100000, 'claude-opus-4-10')).toBe(100000);
       });
     });
 
diff --git a/packages/data-provider/src/schemas.ts b/packages/data-provider/src/schemas.ts
index a3378d3340..039bfa572e 100644
--- a/packages/data-provider/src/schemas.ts
+++ b/packages/data-provider/src/schemas.ts
@@ -38,6 +38,7 @@ export enum Providers {
   MISTRALAI = 'mistralai',
   MISTRAL = 'mistral',
   DEEPSEEK = 'deepseek',
+  MOONSHOT = 'moonshot',
   OPENROUTER = 'openrouter',
   XAI = 'xai',
 }
@@ -56,6 +57,7 @@ export const documentSupportedProviders = new Set<string>([
   Providers.MISTRALAI,
   Providers.MISTRAL,
   Providers.DEEPSEEK,
+  Providers.MOONSHOT,
   Providers.OPENROUTER,
   Providers.XAI,
 ]);
@@ -67,6 +69,7 @@ const openAILikeProviders = new Set<string>([
   Providers.MISTRALAI,
   Providers.MISTRAL,
   Providers.DEEPSEEK,
+  Providers.MOONSHOT,
   Providers.OPENROUTER,
   Providers.XAI,
 ]);
@@ -98,7 +101,10 @@ export enum BedrockProviders {
   Meta = 'meta',
   MistralAI = 'mistral',
   Moonshot = 'moonshot',
+  MoonshotAI = 'moonshotai',
+  OpenAI = 'openai',
   StabilityAI = 'stability',
+  ZAI = 'zai',
 }
 
 export const getModelKey = (endpoint: EModelEndpoint | string, model: string) => {
@@ -170,6 +176,14 @@ export enum ReasoningEffort {
   xhigh = 'xhigh',
 }
 
+export enum AnthropicEffort {
+  unset = '',
+  low = 'low',
+  medium = 'medium',
+  high = 'high',
+  max = 'max',
+}
+
 export enum ReasoningSummary {
   none = '',
   auto = 'auto',
@@ -198,6 +212,7 @@ export const imageDetailValue = {
 
 export const eImageDetailSchema = z.nativeEnum(ImageDetail);
 export const eReasoningEffortSchema = z.nativeEnum(ReasoningEffort);
+export const eAnthropicEffortSchema = z.nativeEnum(AnthropicEffort);
 export const eReasoningSummarySchema = z.nativeEnum(ReasoningSummary);
 export const eVerbositySchema = z.nativeEnum(Verbosity);
 
@@ -225,6 +240,7 @@ export const defaultAgentFormValues = {
   model: '',
   model_parameters: {},
   tools: [],
+  tool_options: {},
   provider: {},
   projectIds: [],
   edges: [],
@@ -378,6 +394,10 @@ export const anthropicSettings = {
     step: 1 as const,
     default: DEFAULT_MAX_OUTPUT,
     reset: (modelName: string) => {
+      if (/claude-opus[-.]?(?:4[-.]?(?:[6-9]|\d{2,})|[5-9]|\d{2,})/.test(modelName)) {
+        return ANTHROPIC_MAX_OUTPUT;
+      }
+
       if (/claude-(?:sonnet|haiku)[-.]?[4-9]/.test(modelName)) {
         return CLAUDE_4_64K_MAX_OUTPUT;
       }
@@ -393,6 +413,13 @@ export const anthropicSettings = {
       return DEFAULT_MAX_OUTPUT;
     },
     set: (value: number, modelName: string) => {
+      if (/claude-opus[-.]?(?:4[-.]?(?:[6-9]|\d{2,})|[5-9]|\d{2,})/.test(modelName)) {
+        if (value > ANTHROPIC_MAX_OUTPUT) {
+          return ANTHROPIC_MAX_OUTPUT;
+        }
+        return value;
+      }
+
       if (/claude-(?:sonnet|haiku)[-.]?[4-9]/.test(modelName) && value > CLAUDE_4_64K_MAX_OUTPUT) {
         return CLAUDE_4_64K_MAX_OUTPUT;
       }
@@ -441,6 +468,16 @@ export const anthropicSettings = {
       default: LEGACY_ANTHROPIC_MAX_OUTPUT,
     },
   },
+  effort: {
+    default: AnthropicEffort.unset,
+    options: [
+      AnthropicEffort.unset,
+      AnthropicEffort.low,
+      AnthropicEffort.medium,
+      AnthropicEffort.high,
+      AnthropicEffort.max,
+    ],
+  },
   web_search: {
     default: false as const,
   },
@@ -699,6 +736,8 @@ export const tConversationSchema = z.object({
   verbosity: eVerbositySchema.optional().nullable(),
   /* OpenAI: use Responses API */
   useResponsesApi: z.boolean().optional(),
+  /* Anthropic: Effort control */
+  effort: eAnthropicEffortSchema.optional().nullable(),
   /* OpenAI Responses API / Anthropic API / Google API */
   web_search: z.boolean().optional(),
   /* disable streaming */
@@ -821,6 +860,7 @@ export const tQueryParamsSchema = tConversationSchema
     promptCache: true,
     thinking: true,
     thinkingBudget: true,
+    effort: true,
     /** @endpoints bedrock */
     region: true,
     /** @endpoints bedrock */
@@ -1118,6 +1158,7 @@ export const anthropicBaseSchema = tConversationSchema.pick({
   promptCache: true,
   thinking: true,
   thinkingBudget: true,
+  effort: true,
   artifacts: true,
   iconURL: true,
   greeting: true,
diff --git a/packages/data-provider/src/types.ts b/packages/data-provider/src/types.ts
index d9050a07f0..a7782a3bc6 100644
--- a/packages/data-provider/src/types.ts
+++ b/packages/data-provider/src/types.ts
@@ -52,6 +52,7 @@ export type TEndpointOption = Pick<
   | 'promptCache'
   | 'thinking'
   | 'thinkingBudget'
+  | 'effort'
   // Assistant/Agent fields
   | 'assistant_id'
   | 'agent_id'
@@ -98,6 +99,7 @@ export type TEphemeralAgent = {
   web_search?: boolean;
   file_search?: boolean;
   execute_code?: boolean;
+  artifacts?: string;
 };
 
 export type TPayload = Partial<TMessage> &
@@ -235,6 +237,33 @@ export type TUpdateUserKeyRequest = {
   expiresAt: string;
 };
 
+export type TAgentApiKeyCreateRequest = {
+  name: string;
+  expiresAt?: string | null;
+};
+
+export type TAgentApiKeyCreateResponse = {
+  id: string;
+  name: string;
+  key: string;
+  keyPrefix: string;
+  createdAt: string;
+  expiresAt?: string;
+};
+
+export type TAgentApiKeyListItem = {
+  id: string;
+  name: string;
+  keyPrefix: string;
+  lastUsedAt?: string;
+  expiresAt?: string;
+  createdAt: string;
+};
+
+export type TAgentApiKeyListResponse = {
+  keys: TAgentApiKeyListItem[];
+};
+
 export type TUpdateConversationRequest = {
   conversationId: string;
   title: string;
diff --git a/packages/data-provider/src/types/assistants.ts b/packages/data-provider/src/types/assistants.ts
index 9e1deb20c1..8865767240 100644
--- a/packages/data-provider/src/types/assistants.ts
+++ b/packages/data-provider/src/types/assistants.ts
@@ -206,6 +206,38 @@ export type SupportContact = {
   email?: string;
 };
 
+/**
+ * Specifies who can invoke a tool.
+ * - 'direct': LLM can call directly
+ * - 'code_execution': Only callable via programmatic tool calling (PTC)
+ */
+export type AllowedCaller = 'direct' | 'code_execution';
+
+/**
+ * Per-tool configuration options stored at the agent level.
+ * Keyed by tool_id (e.g., "search_mcp_github").
+ */
+export type ToolOptions = {
+  /**
+   * If true, the tool uses deferred loading (discoverable via tool search).
+   * @default false
+   */
+  defer_loading?: boolean;
+  /**
+   * Specifies who can invoke this tool.
+   * - 'direct': LLM can call directly (default behavior)
+   * - 'code_execution': Only callable via PTC sandbox
+   * @default ['direct']
+   */
+  allowed_callers?: AllowedCaller[];
+};
+
+/**
+ * Map of tool_id to its configuration options.
+ * Used to customize tool behavior per agent.
+ */
+export type AgentToolOptions = Record<string, ToolOptions>;
+
 export type Agent = {
   _id?: string;
   id: string;
@@ -217,7 +249,7 @@ export type Agent = {
   description: string | null;
   created_at: number;
   avatar: AgentAvatar | null;
-  instructions: string | null;
+  instructions?: string | null;
   additional_instructions?: string | null;
   tools?: string[];
   projectIds?: string[];
@@ -241,6 +273,8 @@ export type Agent = {
   version?: number;
   category?: string;
   support_contact?: SupportContact;
+  /** Per-tool configuration options (deferred loading, allowed callers, etc.) */
+  tool_options?: AgentToolOptions;
 };
 
 export type TAgentsMap = Record<string, Agent | undefined>;
@@ -265,6 +299,7 @@ export type AgentCreateParams = {
   | 'recursion_limit'
   | 'category'
   | 'support_contact'
+  | 'tool_options'
 >;
 
 export type AgentUpdateParams = {
@@ -291,6 +326,7 @@ export type AgentUpdateParams = {
   | 'recursion_limit'
   | 'category'
   | 'support_contact'
+  | 'tool_options'
 >;
 
 export type AgentListParams = {
diff --git a/packages/data-provider/src/types/mutations.ts b/packages/data-provider/src/types/mutations.ts
index 1a7211edfa..15f0cd2329 100644
--- a/packages/data-provider/src/types/mutations.ts
+++ b/packages/data-provider/src/types/mutations.ts
@@ -313,6 +313,15 @@ export type UpdateMCPServersPermOptions = MutationOptions<
   types.TError | null | undefined
 >;
 
+export type UpdateRemoteAgentsPermVars = UpdatePermVars<p.TRemoteAgentsPermissions>;
+
+export type UpdateRemoteAgentsPermOptions = MutationOptions<
+  UpdatePermResponse,
+  UpdateRemoteAgentsPermVars,
+  unknown,
+  types.TError | null | undefined
+>;
+
 export type UpdateMarketplacePermVars = UpdatePermVars<p.TMarketplacePermissions>;
 
 export type UpdateMarketplacePermOptions = MutationOptions<
diff --git a/packages/data-schemas/package.json b/packages/data-schemas/package.json
index 49c29f8561..7da0015e1f 100644
--- a/packages/data-schemas/package.json
+++ b/packages/data-schemas/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@librechat/data-schemas",
-  "version": "0.0.33",
+  "version": "0.0.35",
   "description": "Mongoose schemas and models for LibreChat",
   "type": "module",
   "main": "dist/index.cjs",
@@ -44,7 +44,6 @@
     "@rollup/plugin-replace": "^5.0.5",
     "@rollup/plugin-terser": "^0.4.4",
     "@rollup/plugin-typescript": "^12.1.2",
-    "@types/diff": "^6.0.0",
     "@types/express": "^5.0.0",
     "@types/jest": "^29.5.2",
     "@types/node": "^20.3.0",
@@ -62,7 +61,7 @@
     "jsonwebtoken": "^9.0.2",
     "klona": "^2.0.6",
     "librechat-data-provider": "*",
-    "lodash": "^4.17.21",
+    "lodash": "^4.17.23",
     "meilisearch": "^0.38.0",
     "mongoose": "^8.12.1",
     "nanoid": "^3.3.7",
diff --git a/packages/data-schemas/src/methods/accessRole.spec.ts b/packages/data-schemas/src/methods/accessRole.spec.ts
index b0f7ba70ef..6919e6c7df 100644
--- a/packages/data-schemas/src/methods/accessRole.spec.ts
+++ b/packages/data-schemas/src/methods/accessRole.spec.ts
@@ -203,6 +203,9 @@ describe('AccessRole Model Tests', () => {
           AccessRoleIds.MCPSERVER_EDITOR,
           AccessRoleIds.MCPSERVER_OWNER,
           AccessRoleIds.MCPSERVER_VIEWER,
+          AccessRoleIds.REMOTE_AGENT_EDITOR,
+          AccessRoleIds.REMOTE_AGENT_OWNER,
+          AccessRoleIds.REMOTE_AGENT_VIEWER,
         ].sort(),
       );
 
diff --git a/packages/data-schemas/src/methods/accessRole.ts b/packages/data-schemas/src/methods/accessRole.ts
index 0971c0f9e8..ab2cffbad8 100644
--- a/packages/data-schemas/src/methods/accessRole.ts
+++ b/packages/data-schemas/src/methods/accessRole.ts
@@ -167,6 +167,27 @@ export function createAccessRoleMethods(mongoose: typeof import('mongoose')) {
         resourceType: ResourceType.MCPSERVER,
         permBits: RoleBits.OWNER,
       },
+      {
+        accessRoleId: AccessRoleIds.REMOTE_AGENT_VIEWER,
+        name: 'com_ui_remote_agent_role_viewer',
+        description: 'com_ui_remote_agent_role_viewer_desc',
+        resourceType: ResourceType.REMOTE_AGENT,
+        permBits: RoleBits.VIEWER,
+      },
+      {
+        accessRoleId: AccessRoleIds.REMOTE_AGENT_EDITOR,
+        name: 'com_ui_remote_agent_role_editor',
+        description: 'com_ui_remote_agent_role_editor_desc',
+        resourceType: ResourceType.REMOTE_AGENT,
+        permBits: RoleBits.EDITOR,
+      },
+      {
+        accessRoleId: AccessRoleIds.REMOTE_AGENT_OWNER,
+        name: 'com_ui_remote_agent_role_owner',
+        description: 'com_ui_remote_agent_role_owner_desc',
+        resourceType: ResourceType.REMOTE_AGENT,
+        permBits: RoleBits.OWNER,
+      },
     ];
 
     const result: Record<string, IAccessRole> = {};
diff --git a/packages/data-schemas/src/methods/agentApiKey.ts b/packages/data-schemas/src/methods/agentApiKey.ts
new file mode 100644
index 0000000000..3462f9ff84
--- /dev/null
+++ b/packages/data-schemas/src/methods/agentApiKey.ts
@@ -0,0 +1,164 @@
+import type { Types } from 'mongoose';
+import type {
+  AgentApiKeyCreateResult,
+  AgentApiKeyCreateData,
+  AgentApiKeyListItem,
+  IAgentApiKey,
+} from '~/types';
+import { hashToken, getRandomValues } from '~/crypto';
+import logger from '~/config/winston';
+
+const API_KEY_PREFIX = 'sk-';
+const API_KEY_LENGTH = 32;
+
+export function createAgentApiKeyMethods(mongoose: typeof import('mongoose')) {
+  async function generateApiKey(): Promise<{ key: string; keyHash: string; keyPrefix: string }> {
+    const randomPart = await getRandomValues(API_KEY_LENGTH);
+    const key = `${API_KEY_PREFIX}${randomPart}`;
+    const keyHash = await hashToken(key);
+    const keyPrefix = key.slice(0, 8);
+    return { key, keyHash, keyPrefix };
+  }
+
+  async function createAgentApiKey(data: AgentApiKeyCreateData): Promise<AgentApiKeyCreateResult> {
+    try {
+      const AgentApiKey = mongoose.models.AgentApiKey;
+      const { key, keyHash, keyPrefix } = await generateApiKey();
+
+      const apiKeyDoc = await AgentApiKey.create({
+        userId: data.userId,
+        name: data.name,
+        keyHash,
+        keyPrefix,
+        expiresAt: data.expiresAt || undefined,
+      });
+
+      return {
+        id: apiKeyDoc._id.toString(),
+        name: apiKeyDoc.name,
+        keyPrefix,
+        key,
+        createdAt: apiKeyDoc.createdAt,
+        expiresAt: apiKeyDoc.expiresAt,
+      };
+    } catch (error) {
+      logger.error('[createAgentApiKey] Error creating API key:', error);
+      throw error;
+    }
+  }
+
+  async function validateAgentApiKey(
+    apiKey: string,
+  ): Promise<{ userId: Types.ObjectId; keyId: Types.ObjectId } | null> {
+    try {
+      const AgentApiKey = mongoose.models.AgentApiKey;
+      const keyHash = await hashToken(apiKey);
+
+      const keyDoc = (await AgentApiKey.findOne({ keyHash }).lean()) as IAgentApiKey | null;
+
+      if (!keyDoc) {
+        return null;
+      }
+
+      if (keyDoc.expiresAt && new Date(keyDoc.expiresAt) < new Date()) {
+        return null;
+      }
+
+      await AgentApiKey.updateOne({ _id: keyDoc._id }, { $set: { lastUsedAt: new Date() } });
+
+      return {
+        userId: keyDoc.userId,
+        keyId: keyDoc._id as Types.ObjectId,
+      };
+    } catch (error) {
+      logger.error('[validateAgentApiKey] Error validating API key:', error);
+      return null;
+    }
+  }
+
+  async function listAgentApiKeys(userId: string | Types.ObjectId): Promise<AgentApiKeyListItem[]> {
+    try {
+      const AgentApiKey = mongoose.models.AgentApiKey;
+      const keys = (await AgentApiKey.find({ userId })
+        .sort({ createdAt: -1 })
+        .lean()) as unknown as IAgentApiKey[];
+
+      return keys.map((key) => ({
+        id: (key._id as Types.ObjectId).toString(),
+        name: key.name,
+        keyPrefix: key.keyPrefix,
+        lastUsedAt: key.lastUsedAt,
+        expiresAt: key.expiresAt,
+        createdAt: key.createdAt,
+      }));
+    } catch (error) {
+      logger.error('[listAgentApiKeys] Error listing API keys:', error);
+      throw error;
+    }
+  }
+
+  async function deleteAgentApiKey(
+    keyId: string | Types.ObjectId,
+    userId: string | Types.ObjectId,
+  ): Promise<boolean> {
+    try {
+      const AgentApiKey = mongoose.models.AgentApiKey;
+      const result = await AgentApiKey.deleteOne({ _id: keyId, userId });
+      return result.deletedCount > 0;
+    } catch (error) {
+      logger.error('[deleteAgentApiKey] Error deleting API key:', error);
+      throw error;
+    }
+  }
+
+  async function deleteAllAgentApiKeys(userId: string | Types.ObjectId): Promise<number> {
+    try {
+      const AgentApiKey = mongoose.models.AgentApiKey;
+      const result = await AgentApiKey.deleteMany({ userId });
+      return result.deletedCount;
+    } catch (error) {
+      logger.error('[deleteAllAgentApiKeys] Error deleting all API keys:', error);
+      throw error;
+    }
+  }
+
+  async function getAgentApiKeyById(
+    keyId: string | Types.ObjectId,
+    userId: string | Types.ObjectId,
+  ): Promise<AgentApiKeyListItem | null> {
+    try {
+      const AgentApiKey = mongoose.models.AgentApiKey;
+      const keyDoc = (await AgentApiKey.findOne({
+        _id: keyId,
+        userId,
+      }).lean()) as IAgentApiKey | null;
+
+      if (!keyDoc) {
+        return null;
+      }
+
+      return {
+        id: (keyDoc._id as Types.ObjectId).toString(),
+        name: keyDoc.name,
+        keyPrefix: keyDoc.keyPrefix,
+        lastUsedAt: keyDoc.lastUsedAt,
+        expiresAt: keyDoc.expiresAt,
+        createdAt: keyDoc.createdAt,
+      };
+    } catch (error) {
+      logger.error('[getAgentApiKeyById] Error getting API key:', error);
+      throw error;
+    }
+  }
+
+  return {
+    createAgentApiKey,
+    validateAgentApiKey,
+    listAgentApiKeys,
+    deleteAgentApiKey,
+    deleteAllAgentApiKeys,
+    getAgentApiKeyById,
+  };
+}
+
+export type AgentApiKeyMethods = ReturnType<typeof createAgentApiKeyMethods>;
diff --git a/packages/data-schemas/src/methods/file.spec.ts b/packages/data-schemas/src/methods/file.spec.ts
index 5cf51684ac..390b6a8f5c 100644
--- a/packages/data-schemas/src/methods/file.spec.ts
+++ b/packages/data-schemas/src/methods/file.spec.ts
@@ -130,7 +130,7 @@ describe('File Methods', () => {
 
       const files = await fileMethods.getFiles({ user: userId });
       expect(files).toHaveLength(3);
-      expect(files.map((f) => f.file_id)).toEqual(expect.arrayContaining(fileIds));
+      expect(files!.map((f) => f.file_id)).toEqual(expect.arrayContaining(fileIds));
     });
 
     it('should exclude text field by default', async () => {
@@ -149,7 +149,7 @@ describe('File Methods', () => {
 
       const files = await fileMethods.getFiles({ file_id: fileId });
       expect(files).toHaveLength(1);
-      expect(files[0].text).toBeUndefined();
+      expect(files![0].text).toBeUndefined();
     });
   });
 
@@ -207,7 +207,7 @@ describe('File Methods', () => {
       expect(files[0].file_id).toBe(contextFileId);
     });
 
-    it('should retrieve files for execute_code tool', async () => {
+    it('should not retrieve execute_code files (handled by getCodeGeneratedFiles)', async () => {
       const userId = new mongoose.Types.ObjectId();
       const codeFileId = uuidv4();
 
@@ -218,14 +218,16 @@ describe('File Methods', () => {
         filepath: '/uploads/code.py',
         type: 'text/x-python',
         bytes: 100,
+        context: FileContext.execute_code,
         metadata: { fileIdentifier: 'some-identifier' },
       });
 
+      // execute_code files are explicitly excluded from getToolFilesByIds
+      // They are retrieved via getCodeGeneratedFiles and getUserCodeFiles instead
       const toolSet = new Set([EToolResources.execute_code]);
       const files = await fileMethods.getToolFilesByIds([codeFileId], toolSet);
 
-      expect(files).toHaveLength(1);
-      expect(files[0].file_id).toBe(codeFileId);
+      expect(files).toHaveLength(0);
     });
   });
 
@@ -490,7 +492,7 @@ describe('File Methods', () => {
 
       const remaining = await fileMethods.getFiles({});
       expect(remaining).toHaveLength(1);
-      expect(remaining[0].user?.toString()).toBe(otherUserId.toString());
+      expect(remaining![0].user?.toString()).toBe(otherUserId.toString());
     });
   });
 
diff --git a/packages/data-schemas/src/methods/file.ts b/packages/data-schemas/src/methods/file.ts
index 5ea27aeb6c..3d7db88c3f 100644
--- a/packages/data-schemas/src/methods/file.ts
+++ b/packages/data-schemas/src/methods/file.ts
@@ -47,7 +47,8 @@ export function createFileMethods(mongoose: typeof import('mongoose')) {
   }
 
   /**
-   * Retrieves tool files (files that are embedded or have a fileIdentifier) from an array of file IDs
+   * Retrieves tool files (files that are embedded or have a fileIdentifier) from an array of file IDs.
+   * Note: execute_code files are handled separately by getCodeGeneratedFiles.
    * @param fileIds - Array of file_id strings to search for
    * @param toolResourceSet - Optional filter for tool resources
    * @returns Files that match the criteria
@@ -61,21 +62,26 @@ export function createFileMethods(mongoose: typeof import('mongoose')) {
     }
 
     try {
-      const filter: FilterQuery<IMongoFile> = {
-        file_id: { $in: fileIds },
-        $or: [],
-      };
+      const orConditions: FilterQuery<IMongoFile>[] = [];
 
       if (toolResourceSet.has(EToolResources.context)) {
-        filter.$or?.push({ text: { $exists: true, $ne: null }, context: FileContext.agents });
+        orConditions.push({ text: { $exists: true, $ne: null }, context: FileContext.agents });
       }
       if (toolResourceSet.has(EToolResources.file_search)) {
-        filter.$or?.push({ embedded: true });
+        orConditions.push({ embedded: true });
       }
-      if (toolResourceSet.has(EToolResources.execute_code)) {
-        filter.$or?.push({ 'metadata.fileIdentifier': { $exists: true } });
+
+      // If no conditions to match, return empty
+      if (orConditions.length === 0) {
+        return [];
       }
 
+      const filter: FilterQuery<IMongoFile> = {
+        file_id: { $in: fileIds },
+        context: { $ne: FileContext.execute_code },
+        $or: orConditions,
+      };
+
       const selectFields: SelectProjection = { text: 0 };
       const sortOptions = { updatedAt: -1 as SortOrder };
 
@@ -87,6 +93,113 @@ export function createFileMethods(mongoose: typeof import('mongoose')) {
     }
   }
 
+  /**
+   * Retrieves files generated by code execution for a given conversation.
+   * These files are stored locally with fileIdentifier metadata for code env re-upload.
+   *
+   * @param conversationId - The conversation ID to search for
+   * @param messageIds - Array of messageIds to filter by (for linear thread filtering).
+   *   While technically optional, this function returns empty if not provided.
+   *   This is intentional: code-generated files must be filtered by thread to avoid
+   *   including files from other branches of a conversation.
+   * @returns Files generated by code execution in the conversation, filtered by messageIds
+   */
+  async function getCodeGeneratedFiles(
+    conversationId: string,
+    messageIds?: string[],
+  ): Promise<IMongoFile[]> {
+    if (!conversationId) {
+      return [];
+    }
+
+    /**
+     * Return early if messageIds not provided - this is intentional behavior.
+     * Code-generated files must be filtered by thread messageIds to ensure we only
+     * return files relevant to the current conversation branch, not orphaned files
+     * from other branches or deleted messages.
+     */
+    if (!messageIds || messageIds.length === 0) {
+      return [];
+    }
+
+    try {
+      const filter: FilterQuery<IMongoFile> = {
+        conversationId,
+        context: FileContext.execute_code,
+        messageId: { $exists: true, $in: messageIds },
+        'metadata.fileIdentifier': { $exists: true },
+      };
+
+      const selectFields: SelectProjection = { text: 0 };
+      const sortOptions = { createdAt: 1 as SortOrder };
+
+      const results = await getFiles(filter, sortOptions, selectFields);
+      return results ?? [];
+    } catch (error) {
+      logger.error('[getCodeGeneratedFiles] Error retrieving code generated files:', error);
+      return [];
+    }
+  }
+
+  /**
+   * Retrieves user-uploaded execute_code files (not code-generated) by their file IDs.
+   * These are files with fileIdentifier metadata but context is NOT execute_code (e.g., agents or message_attachment).
+   * File IDs should be collected from message.files arrays in the current thread.
+   * @param fileIds - Array of file IDs to fetch (from message.files in the thread)
+   * @returns User-uploaded execute_code files
+   */
+  async function getUserCodeFiles(fileIds?: string[]): Promise<IMongoFile[]> {
+    if (!fileIds || fileIds.length === 0) {
+      return [];
+    }
+
+    try {
+      const filter: FilterQuery<IMongoFile> = {
+        file_id: { $in: fileIds },
+        context: { $ne: FileContext.execute_code },
+        'metadata.fileIdentifier': { $exists: true },
+      };
+
+      const selectFields: SelectProjection = { text: 0 };
+      const sortOptions = { createdAt: 1 as SortOrder };
+
+      const results = await getFiles(filter, sortOptions, selectFields);
+      return results ?? [];
+    } catch (error) {
+      logger.error('[getUserCodeFiles] Error retrieving user code files:', error);
+      return [];
+    }
+  }
+
+  /**
+   * Atomically claims a file_id for a code-execution output by compound key.
+   * Uses $setOnInsert so concurrent calls for the same (filename, conversationId)
+   * converge on a single record instead of creating duplicates.
+   */
+  async function claimCodeFile(data: {
+    filename: string;
+    conversationId: string;
+    file_id: string;
+    user: string;
+  }): Promise<IMongoFile> {
+    const File = mongoose.models.File as Model<IMongoFile>;
+    const result = await File.findOneAndUpdate(
+      {
+        filename: data.filename,
+        conversationId: data.conversationId,
+        context: FileContext.execute_code,
+      },
+      { $setOnInsert: { file_id: data.file_id, user: data.user } },
+      { upsert: true, new: true },
+    ).lean();
+    if (!result) {
+      throw new Error(
+        `[claimCodeFile] Failed to claim file "${data.filename}" for conversation ${data.conversationId}`,
+      );
+    }
+    return result as IMongoFile;
+  }
+
   /**
    * Creates a new file with a TTL of 1 hour.
    * @param data - The file data to be created, must contain file_id
@@ -258,6 +371,9 @@ export function createFileMethods(mongoose: typeof import('mongoose')) {
     findFileById,
     getFiles,
     getToolFilesByIds,
+    getCodeGeneratedFiles,
+    getUserCodeFiles,
+    claimCodeFile,
     createFile,
     updateFile,
     updateFileUsage,
diff --git a/packages/data-schemas/src/methods/index.ts b/packages/data-schemas/src/methods/index.ts
index b6f1be64e9..2f20b67fec 100644
--- a/packages/data-schemas/src/methods/index.ts
+++ b/packages/data-schemas/src/methods/index.ts
@@ -10,6 +10,8 @@ import { createFileMethods, type FileMethods } from './file';
 import { createMemoryMethods, type MemoryMethods } from './memory';
 /* Agent Categories */
 import { createAgentCategoryMethods, type AgentCategoryMethods } from './agentCategory';
+/* Agent API Keys */
+import { createAgentApiKeyMethods, type AgentApiKeyMethods } from './agentApiKey';
 /* MCP Servers */
 import { createMCPServerMethods, type MCPServerMethods } from './mcpServer';
 /* Plugin Auth */
@@ -28,6 +30,7 @@ export type AllMethods = UserMethods &
   FileMethods &
   MemoryMethods &
   AgentCategoryMethods &
+  AgentApiKeyMethods &
   MCPServerMethods &
   UserGroupMethods &
   AclEntryMethods &
@@ -49,6 +52,7 @@ export function createMethods(mongoose: typeof import('mongoose')): AllMethods {
     ...createFileMethods(mongoose),
     ...createMemoryMethods(mongoose),
     ...createAgentCategoryMethods(mongoose),
+    ...createAgentApiKeyMethods(mongoose),
     ...createMCPServerMethods(mongoose),
     ...createAccessRoleMethods(mongoose),
     ...createUserGroupMethods(mongoose),
@@ -67,6 +71,7 @@ export type {
   FileMethods,
   MemoryMethods,
   AgentCategoryMethods,
+  AgentApiKeyMethods,
   MCPServerMethods,
   UserGroupMethods,
   AclEntryMethods,
diff --git a/packages/data-schemas/src/models/agentApiKey.ts b/packages/data-schemas/src/models/agentApiKey.ts
new file mode 100644
index 0000000000..70387a2cef
--- /dev/null
+++ b/packages/data-schemas/src/models/agentApiKey.ts
@@ -0,0 +1,7 @@
+import agentApiKeySchema, { IAgentApiKey } from '~/schema/agentApiKey';
+
+export function createAgentApiKeyModel(mongoose: typeof import('mongoose')) {
+  return (
+    mongoose.models.AgentApiKey || mongoose.model<IAgentApiKey>('AgentApiKey', agentApiKeySchema)
+  );
+}
diff --git a/packages/data-schemas/src/models/index.ts b/packages/data-schemas/src/models/index.ts
index 45516d5a7c..ca1a6259be 100644
--- a/packages/data-schemas/src/models/index.ts
+++ b/packages/data-schemas/src/models/index.ts
@@ -5,6 +5,7 @@ import { createBalanceModel } from './balance';
 import { createConversationModel } from './convo';
 import { createMessageModel } from './message';
 import { createAgentModel } from './agent';
+import { createAgentApiKeyModel } from './agentApiKey';
 import { createAgentCategoryModel } from './agentCategory';
 import { createMCPServerModel } from './mcpServer';
 import { createRoleModel } from './role';
@@ -39,6 +40,7 @@ export function createModels(mongoose: typeof import('mongoose')) {
     Conversation: createConversationModel(mongoose),
     Message: createMessageModel(mongoose),
     Agent: createAgentModel(mongoose),
+    AgentApiKey: createAgentApiKeyModel(mongoose),
     AgentCategory: createAgentCategoryModel(mongoose),
     MCPServer: createMCPServerModel(mongoose),
     Role: createRoleModel(mongoose),
diff --git a/packages/data-schemas/src/models/plugins/mongoMeili.spec.ts b/packages/data-schemas/src/models/plugins/mongoMeili.spec.ts
index 8f4ee87aaf..d988624d13 100644
--- a/packages/data-schemas/src/models/plugins/mongoMeili.spec.ts
+++ b/packages/data-schemas/src/models/plugins/mongoMeili.spec.ts
@@ -6,10 +6,20 @@ import { createMessageModel } from '~/models/message';
 import { SchemaWithMeiliMethods } from '~/models/plugins/mongoMeili';
 
 const mockAddDocuments = jest.fn();
+const mockAddDocumentsInBatches = jest.fn();
+const mockUpdateDocuments = jest.fn();
+const mockDeleteDocument = jest.fn();
+const mockDeleteDocuments = jest.fn();
+const mockGetDocument = jest.fn();
 const mockIndex = jest.fn().mockReturnValue({
   getRawInfo: jest.fn(),
   updateSettings: jest.fn(),
   addDocuments: mockAddDocuments,
+  addDocumentsInBatches: mockAddDocumentsInBatches,
+  updateDocuments: mockUpdateDocuments,
+  deleteDocument: mockDeleteDocument,
+  deleteDocuments: mockDeleteDocuments,
+  getDocument: mockGetDocument,
   getDocuments: jest.fn().mockReturnValue({ results: [] }),
 });
 jest.mock('meilisearch', () => {
@@ -42,6 +52,11 @@ describe('Meilisearch Mongoose plugin', () => {
 
   beforeEach(() => {
     mockAddDocuments.mockClear();
+    mockAddDocumentsInBatches.mockClear();
+    mockUpdateDocuments.mockClear();
+    mockDeleteDocument.mockClear();
+    mockDeleteDocuments.mockClear();
+    mockGetDocument.mockClear();
   });
 
   afterAll(async () => {
@@ -264,4 +279,975 @@ describe('Meilisearch Mongoose plugin', () => {
       expect(indexedCount).toBe(2);
     });
   });
+
+  describe('New batch processing and retry functionality', () => {
+    test('processSyncBatch uses addDocumentsInBatches', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+      mockAddDocuments.mockClear();
+
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Test Conversation',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      // Run sync which should call processSyncBatch internally
+      await conversationModel.syncWithMeili();
+
+      // Verify addDocumentsInBatches was called (new batch method)
+      expect(mockAddDocumentsInBatches).toHaveBeenCalled();
+    });
+
+    test('addObjectToMeili retries on failure', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+
+      // Mock addDocuments to fail twice then succeed
+      mockAddDocuments
+        .mockRejectedValueOnce(new Error('Network error'))
+        .mockRejectedValueOnce(new Error('Network error'))
+        .mockResolvedValueOnce({});
+
+      // Create a document which triggers addObjectToMeili
+      await conversationModel.create({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Test Retry',
+        endpoint: EModelEndpoint.openAI,
+      });
+
+      // Wait for async operations to complete
+      await new Promise((resolve) => setTimeout(resolve, 100));
+
+      // Verify addDocuments was called multiple times due to retries
+      expect(mockAddDocuments).toHaveBeenCalledTimes(3);
+    });
+
+    test('getSyncProgress returns accurate progress information', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      // Insert documents directly to control the _meiliIndex flag
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Indexed',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: true,
+        expiredAt: null,
+      });
+
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Not Indexed',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      const progress = await conversationModel.getSyncProgress();
+
+      expect(progress.totalDocuments).toBe(2);
+      expect(progress.totalProcessed).toBe(1);
+      expect(progress.isComplete).toBe(false);
+    });
+
+    test('getSyncProgress excludes TTL documents from counts', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      // Insert syncable documents (expiredAt: null)
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Syncable Indexed',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: true,
+        expiredAt: null,
+      });
+
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Syncable Not Indexed',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      // Insert TTL documents (expiredAt set) - these should NOT be counted
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'TTL Document 1',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: true,
+        expiredAt: new Date(),
+      });
+
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'TTL Document 2',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: false,
+        expiredAt: new Date(),
+      });
+
+      const progress = await conversationModel.getSyncProgress();
+
+      // Only syncable documents should be counted (2 total, 1 indexed)
+      expect(progress.totalDocuments).toBe(2);
+      expect(progress.totalProcessed).toBe(1);
+      expect(progress.isComplete).toBe(false);
+    });
+
+    test('getSyncProgress shows completion when all syncable documents are indexed', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+
+      // All syncable documents are indexed
+      await messageModel.collection.insertOne({
+        messageId: new mongoose.Types.ObjectId(),
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        isCreatedByUser: true,
+        _meiliIndex: true,
+        expiredAt: null,
+      });
+
+      await messageModel.collection.insertOne({
+        messageId: new mongoose.Types.ObjectId(),
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        isCreatedByUser: false,
+        _meiliIndex: true,
+        expiredAt: null,
+      });
+
+      // Add TTL document - should not affect completion status
+      await messageModel.collection.insertOne({
+        messageId: new mongoose.Types.ObjectId(),
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        isCreatedByUser: true,
+        _meiliIndex: false,
+        expiredAt: new Date(),
+      });
+
+      const progress = await messageModel.getSyncProgress();
+
+      expect(progress.totalDocuments).toBe(2);
+      expect(progress.totalProcessed).toBe(2);
+      expect(progress.isComplete).toBe(true);
+    });
+  });
+
+  describe('Error handling in processSyncBatch', () => {
+    test('syncWithMeili fails when processSyncBatch encounters addDocumentsInBatches error', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+
+      // Insert a document to sync
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Test Conversation',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      // Mock addDocumentsInBatches to fail
+      mockAddDocumentsInBatches.mockRejectedValueOnce(new Error('MeiliSearch connection error'));
+
+      // Sync should throw the error
+      await expect(conversationModel.syncWithMeili()).rejects.toThrow(
+        'MeiliSearch connection error',
+      );
+
+      // Verify the error was logged
+      expect(mockAddDocumentsInBatches).toHaveBeenCalled();
+
+      // Document should NOT be marked as indexed since sync failed
+      // Note: direct collection.insertOne doesn't set default values, so _meiliIndex may be undefined
+      const doc = await conversationModel.findOne({});
+      expect(doc?._meiliIndex).not.toBe(true);
+    });
+
+    test('syncWithMeili fails when processSyncBatch encounters updateMany error', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+
+      // Insert a document
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Test Conversation',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      // Mock addDocumentsInBatches to succeed but simulate updateMany failure
+      mockAddDocumentsInBatches.mockResolvedValueOnce({});
+
+      // Spy on updateMany and make it fail
+      const updateManySpy = jest
+        .spyOn(conversationModel, 'updateMany')
+        .mockRejectedValueOnce(new Error('Database connection error'));
+
+      // Sync should throw the error
+      await expect(conversationModel.syncWithMeili()).rejects.toThrow('Database connection error');
+
+      expect(updateManySpy).toHaveBeenCalled();
+
+      // Restore original implementation
+      updateManySpy.mockRestore();
+    });
+
+    test('processSyncBatch logs error and throws when addDocumentsInBatches fails', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+
+      mockAddDocumentsInBatches.mockRejectedValueOnce(new Error('Network timeout'));
+
+      await messageModel.collection.insertOne({
+        messageId: new mongoose.Types.ObjectId(),
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        isCreatedByUser: true,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      const indexMock = mockIndex();
+      const documents = await messageModel.find({ _meiliIndex: false }).lean();
+
+      // Should throw the error
+      await expect(messageModel.processSyncBatch(indexMock, documents)).rejects.toThrow(
+        'Network timeout',
+      );
+
+      expect(mockAddDocumentsInBatches).toHaveBeenCalled();
+    });
+
+    test('processSyncBatch handles empty document array gracefully', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      const indexMock = mockIndex();
+
+      // Should not throw with empty array
+      await expect(conversationModel.processSyncBatch(indexMock, [])).resolves.not.toThrow();
+
+      // Should not call addDocumentsInBatches
+      expect(mockAddDocumentsInBatches).not.toHaveBeenCalled();
+    });
+
+    test('syncWithMeili stops processing when batch fails and does not process remaining documents', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+
+      // Create multiple documents
+      for (let i = 0; i < 5; i++) {
+        await conversationModel.collection.insertOne({
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: `Test Conversation ${i}`,
+          endpoint: EModelEndpoint.openAI,
+          _meiliIndex: false,
+          expiredAt: null,
+        });
+      }
+
+      // Mock addDocumentsInBatches to fail on first call
+      mockAddDocumentsInBatches.mockRejectedValueOnce(new Error('First batch failed'));
+
+      // Sync should fail on the first batch
+      await expect(conversationModel.syncWithMeili()).rejects.toThrow('First batch failed');
+
+      // Should have attempted only once before failing
+      expect(mockAddDocumentsInBatches).toHaveBeenCalledTimes(1);
+
+      // No documents should be indexed since sync failed
+      const indexedCount = await conversationModel.countDocuments({ _meiliIndex: true });
+      expect(indexedCount).toBe(0);
+    });
+
+    test('error in processSyncBatch is properly logged before being thrown', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+
+      const testError = new Error('Test error for logging');
+      mockAddDocumentsInBatches.mockRejectedValueOnce(testError);
+
+      await messageModel.collection.insertOne({
+        messageId: new mongoose.Types.ObjectId(),
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        isCreatedByUser: true,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      const indexMock = mockIndex();
+      const documents = await messageModel.find({ _meiliIndex: false }).lean();
+
+      // Should throw the same error that was passed to it
+      await expect(messageModel.processSyncBatch(indexMock, documents)).rejects.toThrow(testError);
+    });
+
+    test('syncWithMeili properly propagates processSyncBatch errors', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+
+      await conversationModel.collection.insertOne({
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        title: 'Test',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: false,
+        expiredAt: null,
+      });
+
+      const customError = new Error('Custom sync error');
+      mockAddDocumentsInBatches.mockRejectedValueOnce(customError);
+
+      // The error should propagate all the way up
+      await expect(conversationModel.syncWithMeili()).rejects.toThrow('Custom sync error');
+    });
+  });
+
+  describe('cleanupMeiliIndex', () => {
+    let mockGetDocuments: jest.Mock;
+
+    beforeEach(() => {
+      mockGetDocuments = jest.fn();
+      mockDeleteDocuments.mockClear();
+      mockIndex.mockReturnValue({
+        getRawInfo: jest.fn(),
+        updateSettings: jest.fn(),
+        addDocuments: mockAddDocuments,
+        addDocumentsInBatches: mockAddDocumentsInBatches,
+        updateDocuments: mockUpdateDocuments,
+        deleteDocument: mockDeleteDocument,
+        deleteDocuments: mockDeleteDocuments,
+        getDocument: mockGetDocument,
+        getDocuments: mockGetDocuments,
+      });
+    });
+
+    test('cleanupMeiliIndex deletes orphaned documents from MeiliSearch', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      const existingConvoId = new mongoose.Types.ObjectId().toString();
+      const orphanedConvoId1 = new mongoose.Types.ObjectId().toString();
+      const orphanedConvoId2 = new mongoose.Types.ObjectId().toString();
+
+      // Create one document in MongoDB
+      await conversationModel.collection.insertOne({
+        conversationId: existingConvoId,
+        user: new mongoose.Types.ObjectId(),
+        title: 'Existing Conversation',
+        endpoint: EModelEndpoint.openAI,
+        _meiliIndex: true,
+        expiredAt: null,
+      });
+
+      // Mock MeiliSearch to return 3 documents (1 exists in MongoDB, 2 are orphaned)
+      mockGetDocuments.mockResolvedValueOnce({
+        results: [
+          { conversationId: existingConvoId },
+          { conversationId: orphanedConvoId1 },
+          { conversationId: orphanedConvoId2 },
+        ],
+      });
+
+      const indexMock = mockIndex();
+      await conversationModel.cleanupMeiliIndex(indexMock, 'conversationId', 100, 0);
+
+      // Should delete the 2 orphaned documents
+      expect(mockDeleteDocuments).toHaveBeenCalledWith([orphanedConvoId1, orphanedConvoId2]);
+    });
+
+    test('cleanupMeiliIndex handles offset correctly when documents are deleted', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+
+      const existingIds = [
+        new mongoose.Types.ObjectId().toString(),
+        new mongoose.Types.ObjectId().toString(),
+        new mongoose.Types.ObjectId().toString(),
+      ];
+
+      const orphanedIds = [
+        new mongoose.Types.ObjectId().toString(),
+        new mongoose.Types.ObjectId().toString(),
+      ];
+
+      // Create existing documents in MongoDB
+      for (const id of existingIds) {
+        await messageModel.collection.insertOne({
+          messageId: id,
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          _meiliIndex: true,
+          expiredAt: null,
+        });
+      }
+
+      // Mock MeiliSearch to return batches with mixed existing and orphaned documents
+      // First batch: 3 documents (1 existing, 2 orphaned) with batchSize=3
+      mockGetDocuments
+        .mockResolvedValueOnce({
+          results: [
+            { messageId: existingIds[0] },
+            { messageId: orphanedIds[0] },
+            { messageId: orphanedIds[1] },
+          ],
+        })
+        // Second batch: should use offset=1 (3 - 2 deleted = 1)
+        // results.length=2 < batchSize=3, so loop should stop after this
+        .mockResolvedValueOnce({
+          results: [{ messageId: existingIds[1] }, { messageId: existingIds[2] }],
+        });
+
+      const indexMock = mockIndex();
+      await messageModel.cleanupMeiliIndex(indexMock, 'messageId', 3, 0);
+
+      // Should have called getDocuments with correct offsets
+      expect(mockGetDocuments).toHaveBeenCalledTimes(2);
+      expect(mockGetDocuments).toHaveBeenNthCalledWith(1, { limit: 3, offset: 0 });
+      // After deleting 2 documents, offset should be: 0 + (3 - 2) = 1
+      expect(mockGetDocuments).toHaveBeenNthCalledWith(2, { limit: 3, offset: 1 });
+
+      // Should delete only the orphaned documents
+      expect(mockDeleteDocuments).toHaveBeenCalledWith([orphanedIds[0], orphanedIds[1]]);
+    });
+
+    test('cleanupMeiliIndex preserves existing documents', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      const existingId1 = new mongoose.Types.ObjectId().toString();
+      const existingId2 = new mongoose.Types.ObjectId().toString();
+
+      // Create documents in MongoDB
+      await conversationModel.collection.insertMany([
+        {
+          conversationId: existingId1,
+          user: new mongoose.Types.ObjectId(),
+          title: 'Conversation 1',
+          endpoint: EModelEndpoint.openAI,
+          _meiliIndex: true,
+          expiredAt: null,
+        },
+        {
+          conversationId: existingId2,
+          user: new mongoose.Types.ObjectId(),
+          title: 'Conversation 2',
+          endpoint: EModelEndpoint.openAI,
+          _meiliIndex: true,
+          expiredAt: null,
+        },
+      ]);
+
+      // Mock MeiliSearch to return the same documents
+      mockGetDocuments.mockResolvedValueOnce({
+        results: [{ conversationId: existingId1 }, { conversationId: existingId2 }],
+      });
+
+      const indexMock = mockIndex();
+      await conversationModel.cleanupMeiliIndex(indexMock, 'conversationId', 100, 0);
+
+      // Should NOT delete any documents
+      expect(mockDeleteDocuments).not.toHaveBeenCalled();
+    });
+
+    test('cleanupMeiliIndex handles empty MeiliSearch index', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+
+      // Mock empty MeiliSearch index
+      mockGetDocuments.mockResolvedValueOnce({
+        results: [],
+      });
+
+      const indexMock = mockIndex();
+      await messageModel.cleanupMeiliIndex(indexMock, 'messageId', 100, 0);
+
+      // Should not attempt to delete anything
+      expect(mockDeleteDocuments).not.toHaveBeenCalled();
+      expect(mockGetDocuments).toHaveBeenCalledTimes(1);
+    });
+
+    test('cleanupMeiliIndex stops when results.length < batchSize', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      const id1 = new mongoose.Types.ObjectId().toString();
+      const id2 = new mongoose.Types.ObjectId().toString();
+
+      await conversationModel.collection.insertMany([
+        {
+          conversationId: id1,
+          user: new mongoose.Types.ObjectId(),
+          title: 'Conversation 1',
+          endpoint: EModelEndpoint.openAI,
+          _meiliIndex: true,
+          expiredAt: null,
+        },
+        {
+          conversationId: id2,
+          user: new mongoose.Types.ObjectId(),
+          title: 'Conversation 2',
+          endpoint: EModelEndpoint.openAI,
+          _meiliIndex: true,
+          expiredAt: null,
+        },
+      ]);
+
+      // Mock: results.length (2) is less than batchSize (100), should process once and stop
+      mockGetDocuments.mockResolvedValueOnce({
+        results: [{ conversationId: id1 }, { conversationId: id2 }],
+      });
+
+      const indexMock = mockIndex();
+      await conversationModel.cleanupMeiliIndex(indexMock, 'conversationId', 100, 0);
+
+      // Should only call getDocuments once
+      expect(mockGetDocuments).toHaveBeenCalledTimes(1);
+      expect(mockDeleteDocuments).not.toHaveBeenCalled();
+    });
+
+    test('cleanupMeiliIndex handles multiple batches correctly', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+
+      const existingIds = Array.from({ length: 5 }, () => new mongoose.Types.ObjectId().toString());
+      const orphanedIds = Array.from({ length: 3 }, () => new mongoose.Types.ObjectId().toString());
+
+      // Create existing documents in MongoDB
+      for (const id of existingIds) {
+        await messageModel.collection.insertOne({
+          messageId: id,
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          _meiliIndex: true,
+          expiredAt: null,
+        });
+      }
+
+      // Mock multiple batches with batchSize=3
+      mockGetDocuments
+        // Batch 1: 2 existing, 1 orphaned
+        .mockResolvedValueOnce({
+          results: [
+            { messageId: existingIds[0] },
+            { messageId: existingIds[1] },
+            { messageId: orphanedIds[0] },
+          ],
+        })
+        // Batch 2: offset should be 0 + (3 - 1) = 2
+        .mockResolvedValueOnce({
+          results: [
+            { messageId: existingIds[2] },
+            { messageId: orphanedIds[1] },
+            { messageId: orphanedIds[2] },
+          ],
+        })
+        // Batch 3: offset should be 2 + (3 - 2) = 3
+        .mockResolvedValueOnce({
+          results: [{ messageId: existingIds[3] }, { messageId: existingIds[4] }],
+        });
+
+      const indexMock = mockIndex();
+      await messageModel.cleanupMeiliIndex(indexMock, 'messageId', 3, 0);
+
+      expect(mockGetDocuments).toHaveBeenCalledTimes(3);
+      expect(mockGetDocuments).toHaveBeenNthCalledWith(1, { limit: 3, offset: 0 });
+      expect(mockGetDocuments).toHaveBeenNthCalledWith(2, { limit: 3, offset: 2 });
+      expect(mockGetDocuments).toHaveBeenNthCalledWith(3, { limit: 3, offset: 3 });
+
+      // Should have deleted orphaned documents in batches
+      expect(mockDeleteDocuments).toHaveBeenCalledTimes(2);
+      expect(mockDeleteDocuments).toHaveBeenNthCalledWith(1, [orphanedIds[0]]);
+      expect(mockDeleteDocuments).toHaveBeenNthCalledWith(2, [orphanedIds[1], orphanedIds[2]]);
+    });
+
+    test('cleanupMeiliIndex handles delay between batches', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      const id1 = new mongoose.Types.ObjectId().toString();
+      const id2 = new mongoose.Types.ObjectId().toString();
+
+      await conversationModel.collection.insertMany([
+        {
+          conversationId: id1,
+          user: new mongoose.Types.ObjectId(),
+          title: 'Conversation 1',
+          endpoint: EModelEndpoint.openAI,
+          _meiliIndex: true,
+          expiredAt: null,
+        },
+        {
+          conversationId: id2,
+          user: new mongoose.Types.ObjectId(),
+          title: 'Conversation 2',
+          endpoint: EModelEndpoint.openAI,
+          _meiliIndex: true,
+          expiredAt: null,
+        },
+      ]);
+
+      mockGetDocuments
+        .mockResolvedValueOnce({
+          results: [{ conversationId: id1 }],
+        })
+        .mockResolvedValueOnce({
+          results: [{ conversationId: id2 }],
+        })
+        .mockResolvedValueOnce({
+          results: [],
+        });
+
+      const indexMock = mockIndex();
+      const startTime = Date.now();
+      await conversationModel.cleanupMeiliIndex(indexMock, 'conversationId', 1, 100);
+      const endTime = Date.now();
+
+      // Should have taken at least 200ms due to delay (2 delays between 3 batches)
+      expect(endTime - startTime).toBeGreaterThanOrEqual(200);
+      expect(mockGetDocuments).toHaveBeenCalledTimes(3);
+    });
+
+    test('cleanupMeiliIndex handles errors gracefully', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+
+      mockGetDocuments.mockRejectedValueOnce(new Error('MeiliSearch connection error'));
+
+      const indexMock = mockIndex();
+
+      // Should not throw, errors are caught and logged
+      await expect(
+        messageModel.cleanupMeiliIndex(indexMock, 'messageId', 100, 0),
+      ).resolves.not.toThrow();
+    });
+
+    test('cleanupMeiliIndex with all documents being orphaned', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      const orphanedId1 = new mongoose.Types.ObjectId().toString();
+      const orphanedId2 = new mongoose.Types.ObjectId().toString();
+      const orphanedId3 = new mongoose.Types.ObjectId().toString();
+
+      // MeiliSearch has documents but MongoDB is empty
+      mockGetDocuments.mockResolvedValueOnce({
+        results: [
+          { conversationId: orphanedId1 },
+          { conversationId: orphanedId2 },
+          { conversationId: orphanedId3 },
+        ],
+      });
+
+      const indexMock = mockIndex();
+      await conversationModel.cleanupMeiliIndex(indexMock, 'conversationId', 100, 0);
+
+      // Should delete all documents since none exist in MongoDB
+      expect(mockDeleteDocuments).toHaveBeenCalledWith([orphanedId1, orphanedId2, orphanedId3]);
+    });
+
+    test('cleanupMeiliIndex adjusts offset to 0 when all batch documents are deleted', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+
+      const orphanedIds = Array.from({ length: 3 }, () => new mongoose.Types.ObjectId().toString());
+      const existingId = new mongoose.Types.ObjectId().toString();
+
+      // Create one existing document
+      await messageModel.collection.insertOne({
+        messageId: existingId,
+        conversationId: new mongoose.Types.ObjectId(),
+        user: new mongoose.Types.ObjectId(),
+        isCreatedByUser: true,
+        _meiliIndex: true,
+        expiredAt: null,
+      });
+
+      mockGetDocuments
+        // Batch 1: All 3 are orphaned
+        .mockResolvedValueOnce({
+          results: [
+            { messageId: orphanedIds[0] },
+            { messageId: orphanedIds[1] },
+            { messageId: orphanedIds[2] },
+          ],
+        })
+        // Batch 2: offset should be 0 + (3 - 3) = 0
+        .mockResolvedValueOnce({
+          results: [{ messageId: existingId }],
+        });
+
+      const indexMock = mockIndex();
+      await messageModel.cleanupMeiliIndex(indexMock, 'messageId', 3, 0);
+
+      expect(mockGetDocuments).toHaveBeenCalledTimes(2);
+      expect(mockGetDocuments).toHaveBeenNthCalledWith(1, { limit: 3, offset: 0 });
+      // After deleting all 3, offset remains at 0
+      expect(mockGetDocuments).toHaveBeenNthCalledWith(2, { limit: 3, offset: 0 });
+
+      expect(mockDeleteDocuments).toHaveBeenCalledWith([
+        orphanedIds[0],
+        orphanedIds[1],
+        orphanedIds[2],
+      ]);
+    });
+  });
+
+  describe('Missing _meiliIndex property handling in sync process', () => {
+    test('syncWithMeili includes documents with missing _meiliIndex', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+
+      // Insert documents with different _meiliIndex states
+      await conversationModel.collection.insertMany([
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'Missing _meiliIndex',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          // _meiliIndex is not set (missing/undefined)
+        },
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'Explicit false',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          _meiliIndex: false,
+        },
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'Already indexed',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          _meiliIndex: true,
+        },
+      ]);
+
+      // Run sync
+      await conversationModel.syncWithMeili();
+
+      // Should have processed 2 documents (missing and false, but not true)
+      expect(mockAddDocumentsInBatches).toHaveBeenCalled();
+
+      // Check that both documents without _meiliIndex=true are now indexed
+      const indexedCount = await conversationModel.countDocuments({
+        expiredAt: null,
+        _meiliIndex: true,
+      });
+      expect(indexedCount).toBe(3); // All 3 should now be indexed
+
+      // Verify documents with missing _meiliIndex were updated
+      const docsWithMissingIndex = await conversationModel.countDocuments({
+        expiredAt: null,
+        title: 'Missing _meiliIndex',
+        _meiliIndex: true,
+      });
+      expect(docsWithMissingIndex).toBe(1);
+    });
+
+    test('getSyncProgress counts documents with missing _meiliIndex as not indexed', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+
+      // Insert documents with different _meiliIndex states
+      await messageModel.collection.insertMany([
+        {
+          messageId: new mongoose.Types.ObjectId(),
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          expiredAt: null,
+          _meiliIndex: true,
+        },
+        {
+          messageId: new mongoose.Types.ObjectId(),
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          expiredAt: null,
+          _meiliIndex: false,
+        },
+        {
+          messageId: new mongoose.Types.ObjectId(),
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          expiredAt: null,
+          // _meiliIndex is missing
+        },
+      ]);
+
+      const progress = await messageModel.getSyncProgress();
+
+      // Total should be 3
+      expect(progress.totalDocuments).toBe(3);
+      // Only 1 is indexed (with _meiliIndex: true)
+      expect(progress.totalProcessed).toBe(1);
+      // Not complete since 2 documents are not indexed
+      expect(progress.isComplete).toBe(false);
+    });
+
+    test('query with _meiliIndex: { $ne: true } includes missing values', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+
+      // Insert documents with different _meiliIndex states
+      await conversationModel.collection.insertMany([
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'Missing',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          // _meiliIndex is missing
+        },
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'False',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          _meiliIndex: false,
+        },
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'True',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          _meiliIndex: true,
+        },
+      ]);
+
+      // Query for documents where _meiliIndex is not true (used in syncWithMeili)
+      const unindexedDocs = await conversationModel.find({
+        expiredAt: null,
+        _meiliIndex: { $ne: true },
+      });
+
+      // Should find 2 documents (missing and false, but not true)
+      expect(unindexedDocs.length).toBe(2);
+      const titles = unindexedDocs.map((doc) => doc.title).sort();
+      expect(titles).toEqual(['False', 'Missing']);
+    });
+
+    test('syncWithMeili processes all documents where _meiliIndex is not true', async () => {
+      const messageModel = createMessageModel(mongoose) as SchemaWithMeiliMethods;
+      await messageModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+
+      // Create a mix of documents with missing and false _meiliIndex
+      await messageModel.collection.insertMany([
+        {
+          messageId: new mongoose.Types.ObjectId(),
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          expiredAt: null,
+          // _meiliIndex missing
+        },
+        {
+          messageId: new mongoose.Types.ObjectId(),
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          expiredAt: null,
+          _meiliIndex: false,
+        },
+        {
+          messageId: new mongoose.Types.ObjectId(),
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          isCreatedByUser: true,
+          expiredAt: null,
+          // _meiliIndex missing
+        },
+      ]);
+
+      // Count documents that should be synced (where _meiliIndex: { $ne: true })
+      const toSyncCount = await messageModel.countDocuments({
+        expiredAt: null,
+        _meiliIndex: { $ne: true },
+      });
+      expect(toSyncCount).toBe(3); // All 3 should be synced
+
+      await messageModel.syncWithMeili();
+
+      // All should now be indexed
+      const indexedCount = await messageModel.countDocuments({
+        expiredAt: null,
+        _meiliIndex: true,
+      });
+      expect(indexedCount).toBe(3);
+    });
+
+    test('syncWithMeili treats missing _meiliIndex same as false', async () => {
+      const conversationModel = createConversationModel(mongoose) as SchemaWithMeiliMethods;
+      await conversationModel.deleteMany({});
+      mockAddDocumentsInBatches.mockClear();
+
+      // Insert one document with missing _meiliIndex and one with false
+      await conversationModel.collection.insertMany([
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'Missing',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          // _meiliIndex is missing
+        },
+        {
+          conversationId: new mongoose.Types.ObjectId(),
+          user: new mongoose.Types.ObjectId(),
+          title: 'False',
+          endpoint: EModelEndpoint.openAI,
+          expiredAt: null,
+          _meiliIndex: false,
+        },
+      ]);
+
+      // Both should be picked up by the sync query
+      const toSync = await conversationModel.find({
+        expiredAt: null,
+        _meiliIndex: { $ne: true },
+      });
+      expect(toSync.length).toBe(2);
+
+      await conversationModel.syncWithMeili();
+
+      // Both should be indexed after sync
+      const afterSync = await conversationModel.find({
+        expiredAt: null,
+        _meiliIndex: true,
+      });
+      expect(afterSync.length).toBe(2);
+    });
+  });
 });
diff --git a/packages/data-schemas/src/models/plugins/mongoMeili.ts b/packages/data-schemas/src/models/plugins/mongoMeili.ts
index 548a7d2f1a..1cbe0d8761 100644
--- a/packages/data-schemas/src/models/plugins/mongoMeili.ts
+++ b/packages/data-schemas/src/models/plugins/mongoMeili.ts
@@ -50,17 +50,11 @@ interface _DocumentWithMeiliIndex extends Document {
 export type DocumentWithMeiliIndex = _DocumentWithMeiliIndex & IConversation & Partial<IMessage>;
 
 export interface SchemaWithMeiliMethods extends Model<DocumentWithMeiliIndex> {
-  syncWithMeili(options?: { resumeFromId?: string }): Promise<void>;
+  syncWithMeili(): Promise<void>;
   getSyncProgress(): Promise<SyncProgress>;
   processSyncBatch(
     index: Index<MeiliIndexable>,
     documents: Array<Record<string, unknown>>,
-    updateOps: Array<{
-      updateOne: {
-        filter: Record<string, unknown>;
-        update: { $set: { _meiliIndex: boolean } };
-      };
-    }>,
   ): Promise<void>;
   cleanupMeiliIndex(
     index: Index<MeiliIndexable>,
@@ -156,8 +150,8 @@ const createMeiliMongooseModel = ({
      * Get the current sync progress
      */
     static async getSyncProgress(this: SchemaWithMeiliMethods): Promise<SyncProgress> {
-      const totalDocuments = await this.countDocuments();
-      const indexedDocuments = await this.countDocuments({ _meiliIndex: true });
+      const totalDocuments = await this.countDocuments({ expiredAt: null });
+      const indexedDocuments = await this.countDocuments({ expiredAt: null, _meiliIndex: true });
 
       return {
         totalProcessed: indexedDocuments,
@@ -167,106 +161,79 @@ const createMeiliMongooseModel = ({
     }
 
     /**
-     * Synchronizes the data between the MongoDB collection and the MeiliSearch index.
-     * Now uses streaming and batching to reduce memory usage.
-     */
-    static async syncWithMeili(
-      this: SchemaWithMeiliMethods,
-      options?: { resumeFromId?: string },
-    ): Promise<void> {
+     * Synchronizes data between the MongoDB collection and the MeiliSearch index by
+     * incrementally indexing only documents where `expiredAt` is `null` and `_meiliIndex` is not `true`
+     * (i.e., non-expired documents that have not yet been indexed, including those with missing or null `_meiliIndex`).
+     * */
+    static async syncWithMeili(this: SchemaWithMeiliMethods): Promise<void> {
+      const startTime = Date.now();
+      const { batchSize, delayMs } = syncConfig;
+
+      const collectionName = primaryKey === 'messageId' ? 'messages' : 'conversations';
+      logger.info(
+        `[syncWithMeili] Starting sync for ${collectionName} with batch size ${batchSize}`,
+      );
+
+      // Get approximate total count for raw estimation, the sync should not overcome this number
+      const approxTotalCount = await this.estimatedDocumentCount();
+      logger.info(
+        `[syncWithMeili] Approximate total number of all ${collectionName}: ${approxTotalCount}`,
+      );
+
       try {
-        const startTime = Date.now();
-        const { batchSize, delayMs } = syncConfig;
-
-        logger.info(
-          `[syncWithMeili] Starting sync for ${primaryKey === 'messageId' ? 'messages' : 'conversations'} with batch size ${batchSize}`,
-        );
-
-        // Build query with resume capability
-        // Do not sync TTL documents
-        const query: FilterQuery<unknown> = { expiredAt: null };
-        if (options?.resumeFromId) {
-          query._id = { $gt: options.resumeFromId };
-        }
-
-        // Get approximate total count for progress tracking
-        const approxTotalCount = await this.estimatedDocumentCount();
-        logger.info(`[syncWithMeili] Approximate total number of documents to sync: ${approxTotalCount}`);
-        
-        let processedCount = 0;
-
         // First, handle documents that need to be removed from Meili
+        logger.info(`[syncWithMeili] Starting cleanup of Meili index ${index.uid} before sync`);
         await this.cleanupMeiliIndex(index, primaryKey, batchSize, delayMs);
-
-        // Process MongoDB documents in batches using cursor
-        const cursor = this.find(query)
-          .select(attributesToIndex.join(' ') + ' _meiliIndex')
-          .sort({ _id: 1 })
-          .batchSize(batchSize)
-          .cursor();
-
-        const format = (doc: Record<string, unknown>) =>
-          _.omitBy(_.pick(doc, attributesToIndex), (v, k) => k.startsWith('$'));
-
-        let documentBatch: Array<Record<string, unknown>> = [];
-        let updateOps: Array<{
-          updateOne: {
-            filter: Record<string, unknown>;
-            update: { $set: { _meiliIndex: boolean } };
-          };
-        }> = [];
-
-        // Process documents in streaming fashion
-        for await (const doc of cursor) {
-          const typedDoc = doc.toObject() as unknown as Record<string, unknown>;
-          const formatted = format(typedDoc);
-
-          // Check if document needs indexing
-          if (!typedDoc._meiliIndex) {
-            documentBatch.push(formatted);
-            updateOps.push({
-              updateOne: {
-                filter: { _id: typedDoc._id },
-                update: { $set: { _meiliIndex: true } },
-              },
-            });
-          }
-
-          processedCount++;
-
-          // Process batch when it reaches the configured size
-          if (documentBatch.length >= batchSize) {
-            await this.processSyncBatch(index, documentBatch, updateOps);
-            documentBatch = [];
-            updateOps = [];
-
-            // Log progress
-            // Calculate percentage based on approximate total count sometimes might lead to more than 100%
-            // the difference is very small and acceptable for progress tracking
-            const percent = Math.round((processedCount / approxTotalCount) * 100);
-            const progress = Math.min(percent, 100);
-            logger.info(`[syncWithMeili] Progress: ${progress}% (count: ${processedCount})`);
-
-            // Add delay to prevent overwhelming resources
-            if (delayMs > 0) {
-              await new Promise((resolve) => setTimeout(resolve, delayMs));
-            }
-          }
-        }
-
-        // Process remaining documents
-        if (documentBatch.length > 0) {
-          await this.processSyncBatch(index, documentBatch, updateOps);
-        }
-
-        const duration = Date.now() - startTime;
-        logger.info(
-          `[syncWithMeili] Completed sync for ${primaryKey === 'messageId' ? 'messages' : 'conversations'} in ${duration}ms`,
-        );
+        logger.info(`[syncWithMeili] Completed cleanup of Meili index: ${index.uid}`);
       } catch (error) {
-        logger.error('[syncWithMeili] Error during sync:', error);
+        logger.error('[syncWithMeili] Error during cleanup Meili before sync:', error);
         throw error;
       }
+
+      let processedCount = 0;
+      let hasMore = true;
+
+      while (hasMore) {
+        const query: FilterQuery<unknown> = {
+          expiredAt: null,
+          _meiliIndex: { $ne: true },
+        };
+
+        try {
+          const documents = await this.find(query)
+            .select(attributesToIndex.join(' ') + ' _meiliIndex')
+            .limit(batchSize)
+            .lean();
+
+          // Check if there are more documents to process
+          if (documents.length === 0) {
+            logger.info('[syncWithMeili] No more documents to process');
+            break;
+          }
+
+          // Process the batch
+          await this.processSyncBatch(index, documents);
+          processedCount += documents.length;
+          logger.info(`[syncWithMeili] Processed: ${processedCount}`);
+
+          if (documents.length < batchSize) {
+            hasMore = false;
+          }
+
+          // Add delay to prevent overwhelming resources
+          if (hasMore && delayMs > 0) {
+            await new Promise((resolve) => setTimeout(resolve, delayMs));
+          }
+        } catch (error) {
+          logger.error('[syncWithMeili] Error processing documents batch:', error);
+          throw error;
+        }
+      }
+
+      const duration = Date.now() - startTime;
+      logger.info(
+        `[syncWithMeili] Completed sync for ${collectionName}. Processed ${processedCount} documents in ${duration}ms`,
+      );
     }
 
     /**
@@ -276,28 +243,26 @@ const createMeiliMongooseModel = ({
       this: SchemaWithMeiliMethods,
       index: Index<MeiliIndexable>,
       documents: Array<Record<string, unknown>>,
-      updateOps: Array<{
-        updateOne: {
-          filter: Record<string, unknown>;
-          update: { $set: { _meiliIndex: boolean } };
-        };
-      }>,
     ): Promise<void> {
       if (documents.length === 0) {
         return;
       }
 
+      // Format documents for MeiliSearch
+      const formattedDocs = documents.map((doc) =>
+        _.omitBy(_.pick(doc, attributesToIndex), (_v, k) => k.startsWith('$')),
+      );
+
       try {
         // Add documents to MeiliSearch
-        await index.addDocuments(documents);
+        await index.addDocumentsInBatches(formattedDocs);
 
         // Update MongoDB to mark documents as indexed
-        if (updateOps.length > 0) {
-          await this.collection.bulkWrite(updateOps);
-        }
+        const docsIds = documents.map((doc) => doc._id);
+        await this.updateMany({ _id: { $in: docsIds } }, { $set: { _meiliIndex: true } });
       } catch (error) {
         logger.error('[processSyncBatch] Error processing batch:', error);
-        // Don't throw - allow sync to continue with other documents
+        throw error;
       }
     }
 
@@ -336,11 +301,15 @@ const createMeiliMongooseModel = ({
           // Delete documents that don't exist in MongoDB
           const toDelete = meiliIds.filter((id) => !existingIds.has(id));
           if (toDelete.length > 0) {
-            await Promise.all(toDelete.map((id) => index.deleteDocument(id as string)));
+            await index.deleteDocuments(toDelete.map(String));
             logger.debug(`[cleanupMeiliIndex] Deleted ${toDelete.length} orphaned documents`);
           }
+          // if fetch documents request returns less documents than limit, all documents are processed
+          if (batch.results.length < batchSize) {
+            break;
+          }
 
-          offset += batchSize;
+          offset += batchSize - toDelete.length;
 
           // Add delay between batches
           if (delayMs > 0) {
diff --git a/packages/data-schemas/src/schema/accessRole.ts b/packages/data-schemas/src/schema/accessRole.ts
index 082c28a5f0..52f9e796c0 100644
--- a/packages/data-schemas/src/schema/accessRole.ts
+++ b/packages/data-schemas/src/schema/accessRole.ts
@@ -16,7 +16,7 @@ const accessRoleSchema = new Schema<IAccessRole>(
     description: String,
     resourceType: {
       type: String,
-      enum: ['agent', 'project', 'file', 'promptGroup', 'mcpServer'],
+      enum: ['agent', 'project', 'file', 'promptGroup', 'mcpServer', 'remoteAgent'],
       required: true,
       default: 'agent',
     },
diff --git a/packages/data-schemas/src/schema/agent.ts b/packages/data-schemas/src/schema/agent.ts
index 51739f552a..32bba8bef8 100644
--- a/packages/data-schemas/src/schema/agent.ts
+++ b/packages/data-schemas/src/schema/agent.ts
@@ -118,6 +118,11 @@ const agentSchema = new Schema<IAgent>(
       default: [],
       index: true,
     },
+    /** Per-tool configuration (defer_loading, allowed_callers) */
+    tool_options: {
+      type: Schema.Types.Mixed,
+      default: undefined,
+    },
   },
   {
     timestamps: true,
diff --git a/packages/data-schemas/src/schema/agentApiKey.ts b/packages/data-schemas/src/schema/agentApiKey.ts
new file mode 100644
index 0000000000..d7037f857f
--- /dev/null
+++ b/packages/data-schemas/src/schema/agentApiKey.ts
@@ -0,0 +1,59 @@
+import mongoose, { Schema, Document, Types } from 'mongoose';
+
+export interface IAgentApiKey extends Document {
+  userId: Types.ObjectId;
+  name: string;
+  keyHash: string;
+  keyPrefix: string;
+  lastUsedAt?: Date;
+  expiresAt?: Date;
+  createdAt: Date;
+  updatedAt: Date;
+}
+
+const agentApiKeySchema: Schema<IAgentApiKey> = new Schema(
+  {
+    userId: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: 'User',
+      required: true,
+      index: true,
+    },
+    name: {
+      type: String,
+      required: true,
+      trim: true,
+      maxlength: 100,
+    },
+    keyHash: {
+      type: String,
+      required: true,
+      select: false,
+      index: true,
+    },
+    keyPrefix: {
+      type: String,
+      required: true,
+      index: true,
+    },
+    lastUsedAt: {
+      type: Date,
+    },
+    expiresAt: {
+      type: Date,
+    },
+  },
+  { timestamps: true },
+);
+
+agentApiKeySchema.index({ userId: 1, name: 1 });
+
+/**
+ * TTL index for automatic cleanup of expired keys.
+ * MongoDB deletes documents when expiresAt passes (expireAfterSeconds: 0 means immediate).
+ * Note: Expired keys are permanently removed, not soft-deleted.
+ * If audit trails are needed, remove this index and check expiration programmatically.
+ */
+agentApiKeySchema.index({ expiresAt: 1 }, { expireAfterSeconds: 0 });
+
+export default agentApiKeySchema;
diff --git a/packages/data-schemas/src/schema/defaults.ts b/packages/data-schemas/src/schema/defaults.ts
index 0ebc5e3665..33af668384 100644
--- a/packages/data-schemas/src/schema/defaults.ts
+++ b/packages/data-schemas/src/schema/defaults.ts
@@ -83,6 +83,9 @@ export const conversationPreset = {
   thinkingBudget: {
     type: Number,
   },
+  effort: {
+    type: String,
+  },
   system: {
     type: String,
   },
diff --git a/packages/data-schemas/src/schema/file.ts b/packages/data-schemas/src/schema/file.ts
index 5bf4d95d87..c5e3b3c4e3 100644
--- a/packages/data-schemas/src/schema/file.ts
+++ b/packages/data-schemas/src/schema/file.ts
@@ -1,5 +1,5 @@
 import mongoose, { Schema } from 'mongoose';
-import { FileSources } from 'librechat-data-provider';
+import { FileContext, FileSources } from 'librechat-data-provider';
 import type { IMongoFile } from '~/types';
 
 const file: Schema<IMongoFile> = new Schema(
@@ -15,6 +15,10 @@ const file: Schema<IMongoFile> = new Schema(
       ref: 'Conversation',
       index: true,
     },
+    messageId: {
+      type: String,
+      index: true,
+    },
     file_id: {
       type: String,
       index: true,
@@ -81,5 +85,9 @@ const file: Schema<IMongoFile> = new Schema(
 );
 
 file.index({ createdAt: 1, updatedAt: 1 });
+file.index(
+  { filename: 1, conversationId: 1, context: 1 },
+  { unique: true, partialFilterExpression: { context: FileContext.execute_code } },
+);
 
 export default file;
diff --git a/packages/data-schemas/src/schema/index.ts b/packages/data-schemas/src/schema/index.ts
index 2d94db5301..454780b8bf 100644
--- a/packages/data-schemas/src/schema/index.ts
+++ b/packages/data-schemas/src/schema/index.ts
@@ -1,5 +1,6 @@
 export { default as actionSchema } from './action';
 export { default as agentSchema } from './agent';
+export { default as agentApiKeySchema } from './agentApiKey';
 export { default as agentCategorySchema } from './agentCategory';
 export { default as assistantSchema } from './assistant';
 export { default as balanceSchema } from './balance';
diff --git a/packages/data-schemas/src/schema/preset.ts b/packages/data-schemas/src/schema/preset.ts
index fb0b1bb7ff..fc23d86c0b 100644
--- a/packages/data-schemas/src/schema/preset.ts
+++ b/packages/data-schemas/src/schema/preset.ts
@@ -30,6 +30,7 @@ export interface IPreset extends Document {
   promptCache?: boolean;
   thinking?: boolean;
   thinkingBudget?: number;
+  effort?: string;
   system?: string;
   resendFiles?: boolean;
   imageDetail?: string;
diff --git a/packages/data-schemas/src/schema/role.ts b/packages/data-schemas/src/schema/role.ts
index 3ac0a7f8a2..e4821ba405 100644
--- a/packages/data-schemas/src/schema/role.ts
+++ b/packages/data-schemas/src/schema/role.ts
@@ -61,6 +61,12 @@ const rolePermissionsSchema = new Schema(
       [Permissions.SHARE]: { type: Boolean },
       [Permissions.SHARE_PUBLIC]: { type: Boolean },
     },
+    [PermissionTypes.REMOTE_AGENTS]: {
+      [Permissions.USE]: { type: Boolean },
+      [Permissions.CREATE]: { type: Boolean },
+      [Permissions.SHARE]: { type: Boolean },
+      [Permissions.SHARE_PUBLIC]: { type: Boolean },
+    },
   },
   { _id: false },
 );
diff --git a/packages/data-schemas/src/types/agent.ts b/packages/data-schemas/src/types/agent.ts
index b150b2ec3f..3549e88b4a 100644
--- a/packages/data-schemas/src/types/agent.ts
+++ b/packages/data-schemas/src/types/agent.ts
@@ -1,5 +1,5 @@
 import { Document, Types } from 'mongoose';
-import type { GraphEdge } from 'librechat-data-provider';
+import type { GraphEdge, AgentToolOptions } from 'librechat-data-provider';
 
 export interface ISupportContact {
   name?: string;
@@ -42,4 +42,6 @@ export interface IAgent extends Omit<Document, 'model'> {
   is_promoted?: boolean;
   /** MCP server names extracted from tools for efficient querying */
   mcpServerNames?: string[];
+  /** Per-tool configuration (defer_loading, allowed_callers) */
+  tool_options?: AgentToolOptions;
 }
diff --git a/packages/data-schemas/src/types/agentApiKey.ts b/packages/data-schemas/src/types/agentApiKey.ts
new file mode 100644
index 0000000000..968937a717
--- /dev/null
+++ b/packages/data-schemas/src/types/agentApiKey.ts
@@ -0,0 +1,46 @@
+import { Document, Types } from 'mongoose';
+
+export interface IAgentApiKey extends Document {
+  userId: Types.ObjectId;
+  name: string;
+  keyHash: string;
+  keyPrefix: string;
+  lastUsedAt?: Date;
+  expiresAt?: Date;
+  createdAt: Date;
+  updatedAt: Date;
+}
+
+export interface AgentApiKeyCreateData {
+  userId: Types.ObjectId | string;
+  name: string;
+  expiresAt?: Date | null;
+}
+
+export interface AgentApiKeyCreateResult {
+  id: string;
+  name: string;
+  keyPrefix: string;
+  key: string;
+  createdAt: Date;
+  expiresAt?: Date;
+}
+
+export interface AgentApiKeyListItem {
+  id: string;
+  name: string;
+  keyPrefix: string;
+  lastUsedAt?: Date;
+  expiresAt?: Date;
+  createdAt: Date;
+}
+
+export interface AgentApiKeyQuery {
+  userId?: Types.ObjectId | string;
+  keyPrefix?: string;
+  id?: string;
+}
+
+export interface AgentApiKeyDeleteResult {
+  deletedCount?: number;
+}
diff --git a/packages/data-schemas/src/types/convo.ts b/packages/data-schemas/src/types/convo.ts
index d3af4ff48d..43965a5827 100644
--- a/packages/data-schemas/src/types/convo.ts
+++ b/packages/data-schemas/src/types/convo.ts
@@ -28,6 +28,7 @@ export interface IConversation extends Document {
   promptCache?: boolean;
   thinking?: boolean;
   thinkingBudget?: number;
+  effort?: string;
   system?: string;
   resendFiles?: boolean;
   imageDetail?: string;
diff --git a/packages/data-schemas/src/types/file.ts b/packages/data-schemas/src/types/file.ts
index 231ab93332..8f17e3b597 100644
--- a/packages/data-schemas/src/types/file.ts
+++ b/packages/data-schemas/src/types/file.ts
@@ -3,6 +3,7 @@ import { Document, Types } from 'mongoose';
 export interface IMongoFile extends Omit<Document, 'model'> {
   user: Types.ObjectId;
   conversationId?: string;
+  messageId?: string;
   file_id: string;
   temp_file_id?: string;
   bytes: number;
diff --git a/packages/data-schemas/src/types/index.ts b/packages/data-schemas/src/types/index.ts
index 828cdf9c8f..38f9f22b50 100644
--- a/packages/data-schemas/src/types/index.ts
+++ b/packages/data-schemas/src/types/index.ts
@@ -10,6 +10,7 @@ export * from './balance';
 export * from './banner';
 export * from './message';
 export * from './agent';
+export * from './agentApiKey';
 export * from './agentCategory';
 export * from './role';
 export * from './action';
diff --git a/packages/data-schemas/src/types/role.ts b/packages/data-schemas/src/types/role.ts
index fc6340da2c..e70e29204a 100644
--- a/packages/data-schemas/src/types/role.ts
+++ b/packages/data-schemas/src/types/role.ts
@@ -59,6 +59,12 @@ export interface IRole extends Document {
       [Permissions.SHARE]?: boolean;
       [Permissions.SHARE_PUBLIC]?: boolean;
     };
+    [PermissionTypes.REMOTE_AGENTS]?: {
+      [Permissions.USE]?: boolean;
+      [Permissions.CREATE]?: boolean;
+      [Permissions.SHARE]?: boolean;
+      [Permissions.SHARE_PUBLIC]?: boolean;
+    };
   };
 }
 
diff --git a/turbo.json b/turbo.json
new file mode 100644
index 0000000000..dbbca31ddb
--- /dev/null
+++ b/turbo.json
@@ -0,0 +1,33 @@
+{
+  "$schema": "https://turbo.build/schema.json",
+  "globalDependencies": ["package-lock.json"],
+  "tasks": {
+    "build": {
+      "dependsOn": ["^build"],
+      "inputs": [
+        "src/**",
+        "!src/**/__tests__/**",
+        "!src/**/__mocks__/**",
+        "!src/**/*.test.*",
+        "!src/**/*.spec.*",
+        "scripts/**",
+        "rollup.config.js",
+        "server-rollup.config.js",
+        "tsconfig.json",
+        "tsconfig.build.json",
+        "vite.config.ts",
+        "index.html",
+        "postcss.config.*",
+        "tailwind.config.*",
+        "package.json"
+      ],
+      "outputs": ["dist/**"]
+    },
+    "@librechat/data-schemas#build": {
+      "dependsOn": ["^build", "librechat-data-provider#build"]
+    },
+    "@librechat/api#build": {
+      "dependsOn": ["^build", "librechat-data-provider#build", "@librechat/data-schemas#build"]
+    }
+  }
+}