diff --git a/api/app/clients/tools/util/handleTools.js b/api/app/clients/tools/util/handleTools.js
index bae7255d97..e9361a70d9 100644
--- a/api/app/clients/tools/util/handleTools.js
+++ b/api/app/clients/tools/util/handleTools.js
@@ -434,6 +434,7 @@ Anchor pattern: \\ue202turn{N}{type}{index} where N=turn number, type=search|new
           user: safeUser,
           userMCPAuthMap,
           res: options.res,
+          streamId: options.req?._resumableStreamId || null,
           model: agent?.model ?? model,
           serverName: config.serverName,
           provider: agent?.provider ?? endpoint,
diff --git a/api/server/services/ActionService.js b/api/server/services/ActionService.js
index 79586f0cf2..a2a515d14a 100644
--- a/api/server/services/ActionService.js
+++ b/api/server/services/ActionService.js
@@ -3,7 +3,12 @@ const { nanoid } = require('nanoid');
 const { tool } = require('@langchain/core/tools');
 const { GraphEvents, sleep } = require('@librechat/agents');
 const { logger, encryptV2, decryptV2 } = require('@librechat/data-schemas');
-const { sendEvent, logAxiosError, refreshAccessToken } = require('@librechat/api');
+const {
+  sendEvent,
+  logAxiosError,
+  refreshAccessToken,
+  GenerationJobManager,
+} = require('@librechat/api');
 const {
   Time,
   CacheKeys,
@@ -127,6 +132,7 @@ async function loadActionSets(searchParams) {
  * @param {string | undefined} [params.description] - The description for the tool.
  * @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.
  * @returns { Promise<typeof tool | { _call: (toolInput: Object | string) => unknown}> } An object with `_call` method to execute the tool input.
  */
 async function createActionTool({
@@ -138,6 +144,7 @@ async function createActionTool({
   name,
   description,
   encrypted,
+  streamId = null,
 }) {
   /** @type {(toolInput: Object | string, config: GraphRunnableConfig) => Promise<unknown>} */
   const _call = async (toolInput, config) => {
@@ -192,7 +199,12 @@ async function createActionTool({
                   `${identifier}:oauth_login:${config.metadata.thread_id}:${config.metadata.run_id}`,
                   'oauth_login',
                   async () => {
-                    sendEvent(res, { event: GraphEvents.ON_RUN_STEP_DELTA, data });
+                    const eventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
+                    if (streamId) {
+                      GenerationJobManager.emitChunk(streamId, eventData);
+                    } else {
+                      sendEvent(res, eventData);
+                    }
                     logger.debug('Sent OAuth login request to client', { action_id, identifier });
                     return true;
                   },
@@ -217,7 +229,12 @@ async function createActionTool({
                 logger.debug('Received OAuth Authorization response', { action_id, identifier });
                 data.delta.auth = undefined;
                 data.delta.expires_at = undefined;
-                sendEvent(res, { event: GraphEvents.ON_RUN_STEP_DELTA, data });
+                const successEventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
+                if (streamId) {
+                  GenerationJobManager.emitChunk(streamId, successEventData);
+                } else {
+                  sendEvent(res, successEventData);
+                }
                 await sleep(3000);
                 metadata.oauth_access_token = result.access_token;
                 metadata.oauth_refresh_token = result.refresh_token;
diff --git a/api/server/services/MCP.js b/api/server/services/MCP.js
index 72db447d3d..3d5c91866d 100644
--- a/api/server/services/MCP.js
+++ b/api/server/services/MCP.js
@@ -13,6 +13,7 @@ const {
   isMCPDomainAllowed,
   normalizeServerName,
   convertWithResolvedRefs,
+  GenerationJobManager,
 } = require('@librechat/api');
 const {
   Time,
@@ -37,8 +38,9 @@ const { getLogStores } = require('~/cache');
  * @param {ServerResponse} params.res - The Express response object for sending events.
  * @param {string} params.stepId - The ID of the step in the flow.
  * @param {ToolCallChunk} params.toolCall - The tool call object containing tool information.
+ * @param {string | null} [params.streamId] - The stream ID for resumable mode.
  */
-function createRunStepDeltaEmitter({ res, stepId, toolCall }) {
+function createRunStepDeltaEmitter({ res, stepId, toolCall, streamId = null }) {
   /**
    * @param {string} authURL - The URL to redirect the user for OAuth authentication.
    * @returns {void}
@@ -54,7 +56,12 @@ function createRunStepDeltaEmitter({ res, stepId, toolCall }) {
         expires_at: Date.now() + Time.TWO_MINUTES,
       },
     };
-    sendEvent(res, { event: GraphEvents.ON_RUN_STEP_DELTA, data });
+    const eventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
+    if (streamId) {
+      GenerationJobManager.emitChunk(streamId, eventData);
+    } else {
+      sendEvent(res, eventData);
+    }
   };
 }
 
@@ -65,8 +72,9 @@ function createRunStepDeltaEmitter({ res, stepId, toolCall }) {
  * @param {string} params.stepId - The ID of the step in the flow.
  * @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.
  */
-function createRunStepEmitter({ res, runId, stepId, toolCall, index }) {
+function createRunStepEmitter({ res, runId, stepId, toolCall, index, streamId = null }) {
   return function () {
     /** @type {import('@librechat/agents').RunStep} */
     const data = {
@@ -79,7 +87,12 @@ function createRunStepEmitter({ res, runId, stepId, toolCall, index }) {
         tool_calls: [toolCall],
       },
     };
-    sendEvent(res, { event: GraphEvents.ON_RUN_STEP, data });
+    const eventData = { event: GraphEvents.ON_RUN_STEP, data };
+    if (streamId) {
+      GenerationJobManager.emitChunk(streamId, eventData);
+    } else {
+      sendEvent(res, eventData);
+    }
   };
 }
 
@@ -110,10 +123,9 @@ function createOAuthStart({ flowId, flowManager, callback }) {
  * @param {ServerResponse} params.res - The Express response object for sending events.
  * @param {string} params.stepId - The ID of the step in the flow.
  * @param {ToolCallChunk} params.toolCall - The tool call object containing tool information.
- * @param {string} params.loginFlowId - The ID of the login flow.
- * @param {FlowStateManager<any>} params.flowManager - The flow manager instance.
+ * @param {string | null} [params.streamId] - The stream ID for resumable mode.
  */
-function createOAuthEnd({ res, stepId, toolCall }) {
+function createOAuthEnd({ res, stepId, toolCall, streamId = null }) {
   return async function () {
     /** @type {{ id: string; delta: AgentToolCallDelta }} */
     const data = {
@@ -123,7 +135,12 @@ function createOAuthEnd({ res, stepId, toolCall }) {
         tool_calls: [{ ...toolCall }],
       },
     };
-    sendEvent(res, { event: GraphEvents.ON_RUN_STEP_DELTA, data });
+    const eventData = { event: GraphEvents.ON_RUN_STEP_DELTA, data };
+    if (streamId) {
+      GenerationJobManager.emitChunk(streamId, eventData);
+    } else {
+      sendEvent(res, eventData);
+    }
     logger.debug('Sent OAuth login success to client');
   };
 }
@@ -164,10 +181,19 @@ function createOAuthCallback({ runStepEmitter, runStepDeltaEmitter }) {
  * @param {AbortSignal} params.signal
  * @param {string} params.model
  * @param {number} [params.index]
+ * @param {string | null} [params.streamId] - The stream ID for resumable mode.
  * @param {Record<string, Record<string, string>>} [params.userMCPAuthMap]
  * @returns { Promise<Array<typeof tool | { _call: (toolInput: Object | string) => unknown}>> } An object with `_call` method to execute the tool input.
  */
-async function reconnectServer({ res, user, index, signal, serverName, userMCPAuthMap }) {
+async function reconnectServer({
+  res,
+  user,
+  index,
+  signal,
+  serverName,
+  userMCPAuthMap,
+  streamId = null,
+}) {
   const runId = Constants.USE_PRELIM_RESPONSE_MESSAGE_ID;
   const flowId = `${user.id}:${serverName}:${Date.now()}`;
   const flowManager = getFlowStateManager(getLogStores(CacheKeys.FLOWS));
@@ -184,11 +210,13 @@ async function reconnectServer({ res, user, index, signal, serverName, userMCPAu
     runId,
     stepId,
     toolCall,
+    streamId,
   });
   const runStepDeltaEmitter = createRunStepDeltaEmitter({
     res,
     stepId,
     toolCall,
+    streamId,
   });
   const callback = createOAuthCallback({ runStepEmitter, runStepDeltaEmitter });
   const oauthStart = createOAuthStart({
@@ -224,6 +252,7 @@ async function reconnectServer({ res, user, index, signal, serverName, userMCPAu
  * @param {Providers | EModelEndpoint} params.provider - The provider for the tool.
  * @param {number} [params.index]
  * @param {AbortSignal} [params.signal]
+ * @param {string | null} [params.streamId] - The stream ID for resumable mode.
  * @param {import('@librechat/api').ParsedServerConfig} [params.config]
  * @param {Record<string, Record<string, string>>} [params.userMCPAuthMap]
  * @returns { Promise<Array<typeof tool | { _call: (toolInput: Object | string) => unknown}>> } An object with `_call` method to execute the tool input.
@@ -237,6 +266,7 @@ async function createMCPTools({
   provider,
   serverName,
   userMCPAuthMap,
+  streamId = null,
 }) {
   // Early domain validation before reconnecting server (avoid wasted work on disallowed domains)
   // Use getAppConfig() to support per-user/role domain restrictions
@@ -252,7 +282,15 @@ async function createMCPTools({
     }
   }
 
-  const result = await reconnectServer({ res, user, index, signal, serverName, userMCPAuthMap });
+  const result = await reconnectServer({
+    res,
+    user,
+    index,
+    signal,
+    serverName,
+    userMCPAuthMap,
+    streamId,
+  });
   if (!result || !result.tools) {
     logger.warn(`[MCP][${serverName}] Failed to reinitialize MCP server.`);
     return;
@@ -265,6 +303,7 @@ async function createMCPTools({
       user,
       provider,
       userMCPAuthMap,
+      streamId,
       availableTools: result.availableTools,
       toolKey: `${tool.name}${Constants.mcp_delimiter}${serverName}`,
       config: serverConfig,
@@ -286,6 +325,7 @@ async function createMCPTools({
  * @param {string} params.model - The model for the tool.
  * @param {number} [params.index]
  * @param {AbortSignal} [params.signal]
+ * @param {string | null} [params.streamId] - The stream ID for resumable mode.
  * @param {Providers | EModelEndpoint} params.provider - The provider for the tool.
  * @param {LCAvailableTools} [params.availableTools]
  * @param {Record<string, Record<string, string>>} [params.userMCPAuthMap]
@@ -302,6 +342,7 @@ async function createMCPTool({
   userMCPAuthMap,
   availableTools,
   config,
+  streamId = null,
 }) {
   const [toolName, serverName] = toolKey.split(Constants.mcp_delimiter);
 
@@ -332,6 +373,7 @@ async function createMCPTool({
       signal,
       serverName,
       userMCPAuthMap,
+      streamId,
     });
     toolDefinition = result?.availableTools?.[toolKey]?.function;
   }
@@ -347,10 +389,18 @@ async function createMCPTool({
     toolName,
     serverName,
     toolDefinition,
+    streamId,
   });
 }
 
-function createToolInstance({ res, toolName, serverName, toolDefinition, provider: _provider }) {
+function createToolInstance({
+  res,
+  toolName,
+  serverName,
+  toolDefinition,
+  provider: _provider,
+  streamId = null,
+}) {
   /** @type {LCTool} */
   const { description, parameters } = toolDefinition;
   const isGoogle = _provider === Providers.VERTEXAI || _provider === Providers.GOOGLE;
@@ -386,6 +436,7 @@ function createToolInstance({ res, toolName, serverName, toolDefinition, provide
         res,
         stepId,
         toolCall,
+        streamId,
       });
       const oauthStart = createOAuthStart({
         flowId,
@@ -396,6 +447,7 @@ function createToolInstance({ res, toolName, serverName, toolDefinition, provide
         res,
         stepId,
         toolCall,
+        streamId,
       });
 
       if (derivedSignal) {
diff --git a/api/server/services/ToolService.js b/api/server/services/ToolService.js
index cb6d3ae667..b8028742ca 100644
--- a/api/server/services/ToolService.js
+++ b/api/server/services/ToolService.js
@@ -630,6 +630,7 @@ async function loadAgentTools({
         encrypted,
         name: toolName,
         description: functionSig.description,
+        streamId,
       });
 
       if (!tool) {