🚌 fix: MCP Runtime Errors while Initializing (#9046)

* chore: Remove eslint-plugin-perfectionist from dependencies

* 🚌 fix: MCP Runtime Errors while Initializing

* chore: Bump @librechat/api version to 1.3.1

* chore: import order

* chore: import order

api/server/controllers/PluginController.js

@@ -113,20 +113,26 @@ const getAvailableTools = async (req, res) => {
       return;
     }
 
-    // If not in cache, build from manifest
     let pluginManifest = availableTools;
     if (customConfig?.mcpServers != null) {
-      const mcpManager = getMCPManager();
-      const flowsCache = getLogStores(CacheKeys.FLOWS);
-      const flowManager = flowsCache ? getFlowStateManager(flowsCache) : null;
-      const serverToolsCallback = createServerToolsCallback();
-      const getServerTools = createGetServerTools();
-      const mcpTools = await mcpManager.loadManifestTools({
-        flowManager,
-        serverToolsCallback,
-        getServerTools,
-      });
-      pluginManifest = [...mcpTools, ...pluginManifest];
+      try {
+        const mcpManager = getMCPManager();
+        const flowsCache = getLogStores(CacheKeys.FLOWS);
+        const flowManager = flowsCache ? getFlowStateManager(flowsCache) : null;
+        const serverToolsCallback = createServerToolsCallback();
+        const getServerTools = createGetServerTools();
+        const mcpTools = await mcpManager.loadManifestTools({
+          flowManager,
+          serverToolsCallback,
+          getServerTools,
+        });
+        pluginManifest = [...mcpTools, ...pluginManifest];
+      } catch (error) {
+        logger.error(
+          '[getAvailableTools] Error loading MCP Tools, servers may still be initializing:',
+          error,
+        );
+      }
     }
 
     /** @type {TPlugin[]} */

api/server/routes/config.js

@@ -109,10 +109,10 @@ router.get('/', async function (req, res) {
       for (const serverName in config.mcpServers) {
         const serverConfig = config.mcpServers[serverName];
         payload.mcpServers[serverName] = {
-          customUserVars: serverConfig?.customUserVars || {},
-          chatMenu: serverConfig?.chatMenu,
-          isOAuth: oauthServers.has(serverName),
           startup: serverConfig?.startup,
+          chatMenu: serverConfig?.chatMenu,
+          isOAuth: oauthServers?.has(serverName),
+          customUserVars: serverConfig?.customUserVars || {},
         };
       }
     }

api/server/services/MCP.js

@@ -1,15 +1,21 @@
 const { z } = require('zod');
 const { tool } = require('@langchain/core/tools');
 const { logger } = require('@librechat/data-schemas');
-const { Time, CacheKeys, StepTypes } = require('librechat-data-provider');
 const { Constants: AgentConstants, Providers, GraphEvents } = require('@librechat/agents');
-const { Constants, ContentTypes, isAssistantsEndpoint } = require('librechat-data-provider');
 const {
   sendEvent,
   MCPOAuthHandler,
   normalizeServerName,
   convertWithResolvedRefs,
 } = require('@librechat/api');
+const {
+  Time,
+  CacheKeys,
+  StepTypes,
+  Constants,
+  ContentTypes,
+  isAssistantsEndpoint,
+} = require('librechat-data-provider');
 const { findToken, createToken, updateToken } = require('~/models');
 const { getMCPManager, getFlowStateManager } = require('~/config');
 const { getCachedTools, loadCustomConfig } = require('./Config');
@@ -254,15 +260,21 @@ async function getMCPSetupData(userId) {
   }
 
   const mcpManager = getMCPManager(userId);
-  const appConnections = mcpManager.getAllConnections() || new Map();
+  /** @type {ReturnType<MCPManager['getAllConnections']>} */
+  let appConnections = new Map();
+  try {
+    appConnections = (await mcpManager.getAllConnections()) || new Map();
+  } catch (error) {
+    logger.error(`[MCP][User: ${userId}] Error getting app connections:`, error);
+  }
   const userConnections = mcpManager.getUserConnections(userId) || new Map();
   const oauthServers = mcpManager.getOAuthServers() || new Set();
 
   return {
     mcpConfig,
+    oauthServers,
     appConnections,
     userConnections,
-    oauthServers,
   };
 }
 

api/server/services/initializeMCPs.js

@@ -14,7 +14,7 @@ async function initializeMCPs(app) {
     return;
   }
 
-  // Filter out servers with startup: false
+  /** Servers filtered with `startup: false` */
   const filteredServers = {};
   for (const [name, config] of Object.entries(mcpServers)) {
     if (config.startup === false) {
@@ -41,7 +41,7 @@ async function initializeMCPs(app) {
       return;
     }
 
-    const mcpTools = mcpManager.getAppToolFunctions();
+    const mcpTools = mcpManager.getAppToolFunctions() ?? {};
     await setCachedTools({ ...cachedTools, ...mcpTools }, { isGlobal: true });
 
     const cache = getLogStores(CacheKeys.CONFIG_STORE);

eslint.config.mjs

@@ -2,7 +2,6 @@ import { fileURLToPath } from 'node:url';
 import path from 'node:path';
 import typescriptEslintEslintPlugin from '@typescript-eslint/eslint-plugin';
 import { fixupConfigRules, fixupPluginRules } from '@eslint/compat';
-import perfectionist from 'eslint-plugin-perfectionist';
 import reactHooks from 'eslint-plugin-react-hooks';
 import tsParser from '@typescript-eslint/parser';
 import importPlugin from 'eslint-plugin-import';
@@ -62,7 +61,6 @@ export default [
       'jsx-a11y': fixupPluginRules(jsxA11Y),
       'import/parsers': tsParser,
       i18next,
-      perfectionist,
       prettier: fixupPluginRules(prettier),
     },
 
@@ -139,46 +137,6 @@ export default [
       'no-restricted-syntax': 'off',
       'react/prop-types': 'off',
       'react/display-name': 'off',
-
-      'perfectionist/sort-imports': [
-        'error',
-        {
-          type: 'line-length',
-          order: 'desc',
-          newlinesBetween: 'never',
-          customGroups: {
-            value: {
-              react: ['^react$'],
-              local: ['^(\\.{1,2}|~)/', '^librechat-data-provider'],
-            },
-          },
-          groups: [
-            'react',
-            'builtin',
-            'external',
-            ['builtin-type', 'external-type'],
-            ['internal-type'],
-            'local',
-            ['parent', 'sibling', 'index'],
-            'object',
-            'unknown',
-          ],
-        },
-      ],
-
-      // 'perfectionist/sort-named-imports': [
-      //   'error',
-      //   {
-      //     type: 'line-length',
-      //     order: 'asc',
-      //     ignoreAlias: false,
-      //     ignoreCase: true,
-      //     specialCharacters: 'keep',
-      //     groupKind: 'mixed',
-      //     partitionByNewLine: false,
-      //     partitionByComment: false,
-      //   },
-      // ],
     },
   },
   {

package-lock.json

@@ -30,7 +30,6 @@
         "eslint-plugin-import": "^2.31.0",
         "eslint-plugin-jest": "^28.11.0",
         "eslint-plugin-jsx-a11y": "^6.10.2",
-        "eslint-plugin-perfectionist": "^4.8.0",
         "eslint-plugin-prettier": "^5.2.3",
         "eslint-plugin-react": "^7.37.4",
         "eslint-plugin-react-hooks": "^5.1.0",
@@ -33994,24 +33993,6 @@
         "node": ">= 0.4"
       }
     },
-    "node_modules/eslint-plugin-perfectionist": {
-      "version": "4.8.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-perfectionist/-/eslint-plugin-perfectionist-4.8.0.tgz",
-      "integrity": "sha512-ZF04IAPGItYMlj9xjgvvl/QpksZf79g0dkxbNcuxDjbcUSZ4CwucJ7h5Yzt5JuHe+i6igQbUYEp40j4ndfbvWQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@typescript-eslint/types": "^8.23.0",
-        "@typescript-eslint/utils": "^8.23.0",
-        "natural-orderby": "^5.0.0"
-      },
-      "engines": {
-        "node": "^18.0.0 || >=20.0.0"
-      },
-      "peerDependencies": {
-        "eslint": ">=8.0.0"
-      }
-    },
     "node_modules/eslint-plugin-prettier": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/eslint-plugin-prettier/-/eslint-plugin-prettier-5.2.3.tgz",
@@ -41452,16 +41433,6 @@
       "integrity": "sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==",
       "dev": true
     },
-    "node_modules/natural-orderby": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/natural-orderby/-/natural-orderby-5.0.0.tgz",
-      "integrity": "sha512-kKHJhxwpR/Okycz4HhQKKlhWe4ASEfPgkSWNmKFHd7+ezuQlxkA5cM3+XkBPvm1gmHen3w53qsYAv+8GwRrBlg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=18"
-      }
-    },
     "node_modules/negotiator": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
@@ -51345,7 +51316,7 @@
     },
     "packages/api": {
       "name": "@librechat/api",
-      "version": "1.3.0",
+      "version": "1.3.1",
       "license": "ISC",
       "devDependencies": {
         "@babel/preset-env": "^7.21.5",

package.json

@@ -102,7 +102,6 @@
     "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-jest": "^28.11.0",
     "eslint-plugin-jsx-a11y": "^6.10.2",
-    "eslint-plugin-perfectionist": "^4.8.0",
     "eslint-plugin-prettier": "^5.2.3",
     "eslint-plugin-react": "^7.37.4",
     "eslint-plugin-react-hooks": "^5.1.0",

packages/api/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@librechat/api",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "type": "commonjs",
   "description": "MCP services for LibreChat",
   "main": "dist/index.js",

packages/api/src/mcp/MCPConnectionFactory.ts

@@ -5,10 +5,10 @@ import type { TUser } from 'librechat-data-provider';
 import type { MCPOAuthTokens, MCPOAuthFlowMetadata } from '~/mcp/oauth';
 import type { FlowStateManager } from '~/flow/manager';
 import type { FlowMetadata } from '~/flow/types';
+import type * as t from './types';
 import { MCPTokenStorage, MCPOAuthHandler } from '~/mcp/oauth';
 import { MCPConnection } from './connection';
 import { processMCPEnv } from '~/utils';
-import type * as t from './types';
 
 export interface BasicConnectionOptions {
   serverName: string;
@@ -350,15 +350,9 @@ export class MCPConnectionFactory {
         logger.info(`${this.logPrefix} OAuth flow started, issued authorization URL to user`);
         await this.oauthStart(authorizationUrl);
       } else {
-        logger.info(`
-═══════════════════════════════════════════════════════════════════════
-Please visit the following URL to authenticate:
-
-${authorizationUrl}
-
-${this.logPrefix} Flow ID: ${newFlowId}
-═══════════════════════════════════════════════════════════════════════
-`);
+        logger.info(
+          `${this.logPrefix} OAuth flow started, no \`oauthStart\` handler defined, relying on callback endpoint`,
+        );
       }
 
       /** Tokens from the new flow */

packages/api/src/mcp/MCPManager.ts

@@ -1,17 +1,17 @@
-import { CallToolResultSchema, ErrorCode, McpError } from '@modelcontextprotocol/sdk/types.js';
-import { logger } from '@librechat/data-schemas';
 import pick from 'lodash/pick';
+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 } from '@librechat/data-schemas';
-import type { TUser } from 'librechat-data-provider';
 import type { FlowStateManager } from '~/flow/manager';
+import type { TUser } from 'librechat-data-provider';
 import type { MCPOAuthTokens } from '~/mcp/oauth';
+import type * as t from './types';
 import { UserConnectionManager } from '~/mcp/UserConnectionManager';
 import { ConnectionsRepository } from '~/mcp/ConnectionsRepository';
 import { formatToolContent } from './parsers';
 import { MCPConnection } from './connection';
 import { CONSTANTS } from './enum';
-import type * as t from './types';
 
 /**
  * Centralized manager for MCP server connections and tool execution.
@@ -43,17 +43,17 @@ export class MCPManager extends UserConnectionManager {
   }
 
   /** Returns all app-level connections */
-  public async getAllConnections(): Promise<Map<string, MCPConnection>> {
+  public async getAllConnections(): Promise<Map<string, MCPConnection> | null> {
     return this.appConnections!.getAll();
   }
 
   /** Get servers that require OAuth */
-  public getOAuthServers(): Set<string> {
+  public getOAuthServers(): Set<string> | null {
     return this.serversRegistry.oauthServers!;
   }
 
   /** Returns all available tool functions from app-level connections */
-  public getAppToolFunctions(): t.LCAvailableTools {
+  public getAppToolFunctions(): t.LCAvailableTools | null {
     return this.serversRegistry.toolFunctions!;
   }