Fatal error starting server: Error: Server does not support completions (required for completion/complete)

[apdsdoug]

Trying to get this MCP working in LibreChat, however I'm getting this error about not supporting completions. Any support would be appreciated!

�[31m❌ [22:48:06] 💥 Fatal error starting server: Error: Server does not support completions (required for completion/complete)�[0m
-- | -- | --
November 18, 2025, 17:48 | �[31m❌ [22:48:06] Error: Server does not support completions (required for completion/complete)
November 18, 2025, 17:48 | at Server.assertRequestHandlerCapability (file:///home/node/.npm/_npx/0d29dd9f4e472da9/node_modules/@modelcontextprotocol/sdk/dist/esm/server/index.js:134:27)
November 18, 2025, 17:48 | at Server.setRequestHandler (file:///home/node/.npm/_npx/0d29dd9f4e472da9/node_modules/@modelcontextprotocol/sdk/dist/esm/shared/protocol.js:369:14)
November 18, 2025, 17:48 | at NotebookLMMCPServer.setupHandlers (file:///home/node/.npm/_npx/0d29dd9f4e472da9/node_modules/notebooklm-mcp/dist/index.js:267:21)
November 18, 2025, 17:48 | at new NotebookLMMCPServer (file:///home/node/.npm/_npx/0d29dd9f4e472da9/node_modules/notebooklm-mcp/dist/index.js:70:14)
November 18, 2025, 17:48 | at main (file:///home/node/.npm/_npx/0d29dd9f4e472da9/node_modules/notebooklm-mcp/dist/index.js:486:24)
November 18, 2025, 17:48 | at file:///home/node/.npm/_npx/0d29dd9f4e472da9/node_modules/notebooklm-mcp/dist/index.js:498:1
November 18, 2025, 17:48 | at ModuleJob.run (node:internal/modules/esm/module_job:325:25)
November 18, 2025, 17:48 | at async ModuleLoader.import (node:internal/modules/esm/loader:606:24)
November 18, 2025, 17:48 | at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:117:5)�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] Notebooks: 0�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] 🆕 Creating new library...�[0m
November 18, 2025, 17:48 | �[32m✅ [22:48:06] 💾 Library saved (0 notebooks)�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] 📚 NotebookLibrary initialized�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] Library path: /home/node/.local/share/notebooklm-mcp/library.json�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] 🎯 SessionManager initialized�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] Max sessions: 10�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] Timeout: 900s (15 minutes)�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] 🌐 SharedContextManager initialized (PERSISTENT MODE)�[0m
November 18, 2025, 17:48 | �[36mℹ️ [22:48:06] Chrome Profile: /home/node/.local/share/notebooklm-mcp/chrome_profile�[0m
November 18, 2025, 17:48 | �[32m✅ [22:48:06] Fingerprint: PERSISTENT across restarts! 🎯�[0m

[System32-0101]

Same here:
╔══════════════════════════════════════════════════════════╗
║ ║
║ NotebookLM MCP Server v1.0.0 ║
║ ║
║ Chat with Gemini 2.5 through NotebookLM via MCP ║
║ ║
╚══════════════════════════════════════════════════════════╝

ℹ️ [07:57:19] 🌐 SharedContextManager initialized (PERSISTENT MODE)
ℹ️ [07:57:19] Chrome Profile: C:\Users\x\AppData\Local\notebooklm-mcp\Data\chrome_profile
✅ [07:57:19] Fingerprint: PERSISTENT across restarts! 🎯
ℹ️ [07:57:19] 🎯 SessionManager initialized
ℹ️ [07:57:19] Max sessions: 10
ℹ️ [07:57:19] Timeout: 900s (15 minutes)
✅ [07:57:19] ✅ Loaded library with 0 notebooks
ℹ️ [07:57:19] 📚 NotebookLibrary initialized
ℹ️ [07:57:19] Library path: C:\Users\x\AppData\Local\notebooklm-mcp\Data\liibrary.json
ℹ️ [07:57:19] Notebooks: 0
❌ [07:57:19] 💥 Fatal error starting server: Error: Server does not support completions (required for completion/complete)
❌ [07:57:19] Error: Server does not support completions (required for completion/complete)

[itelly-de]

Same hiere

[PleasePrompto]

Fixed in v1.2.0

The "Server does not support completions" error has been resolved by adding prompts: {} and logging: {} to the server capabilities.

Update

npm install notebooklm-mcp@latest

The server now properly declares all required capabilities for LibreChat compatibility. Please update and let me know if you encounter any other issues.

[thib3113]

Seems to doesn't works with the version actually published ... got the same error with npx

 npx notebooklm-mcp@1.2.0            
╔══════════════════════════════════════════════════════════╗
║                                                          ║
║           NotebookLM MCP Server v1.0.0                   ║
║                                                          ║
║   Chat with Gemini 2.5 through NotebookLM via MCP       ║
║                                                          ║
╚══════════════════════════════════════════════════════════╝

ℹ️  [20:46:41] 🌐 SharedContextManager initialized (PERSISTENT MODE)
ℹ️  [20:46:41]   Chrome Profile: [...]\notebooklm-mcp\Data\chrome_profile
✅  [20:46:41]   Fingerprint: PERSISTENT across restarts! 🎯
ℹ️  [20:46:41] 🎯 SessionManager initialized
ℹ️  [20:46:41]   Max sessions: 10
ℹ️  [20:46:41]   Timeout: 900s (15 minutes)
✅  [20:46:41]   ✅ Loaded library with 0 notebooks
ℹ️  [20:46:41] 📚 NotebookLibrary initialized
ℹ️  [20:46:41]   Library path: [...]\notebooklm-mcp\Data\library.json
ℹ️  [20:46:41]   Notebooks: 0
❌  [20:46:41] 💥 Fatal error starting server: Error: Server does not support completions (required for completion/complete)
❌  [20:46:41] Error: Server does not support completions (required for completion/complete)

[itelly-de]

╔══════════════════════════════════════════════════════════╗
║ ║
║ NotebookLM MCP Server v1.3.0 ║
║ ║
║ Chat with Gemini 2.5 through NotebookLM via MCP ║
║ ║
╚══════════════════════════════════════════════════════════╝

ℹ️ [07:12:55] 🌐 SharedContextManager initialized (PERSISTENT MODE)
ℹ️ [07:12:55] Chrome Profile: /Users/home/Library/Application Support/notebooklm-mcp/chrome_profile
✅ [07:12:55] Fingerprint: PERSISTENT across restarts! 🎯
ℹ️ [07:12:55] 🎯 SessionManager initialized
ℹ️ [07:12:55] Max sessions: 10
ℹ️ [07:12:55] Timeout: 900s (15 minutes)
✅ [07:12:55] ✅ Loaded library with 0 notebooks
ℹ️ [07:12:55] 📚 NotebookLibrary initialized
ℹ️ [07:12:55] Library path: /Users/home/Library/Application Support/notebooklm-mcp/library.json
ℹ️ [07:12:55] Notebooks: 0
❌ [07:12:55] 💥 Fatal error starting server: Error: Server does not support completions (required for completion/complete)
❌ [07:12:55] Error: Server does not support completions (required for completion/complete)
at Server.assertRequestHandlerCapability (file:///Users/home/.npm/_npx/012884e0010cfc5b/node_modules/@modelcontextprotocol/sdk/dist/esm/server/index.js:134:27)
at Server.setRequestHandler (file:///Users/home/.npm/_npx/012884e0010cfc5b/node_modules/@modelcontextprotocol/sdk/dist/esm/shared/protocol.js:369:14)
at NotebookLMMCPServer.setupHandlers (file:///Users/home/.npm/_npx/012884e0010cfc5b/node_modules/@roomi-fields/notebooklm-mcp/dist/index.js:267:21)
at new NotebookLMMCPServer (file:///Users/home/.npm/_npx/012884e0010cfc5b/node_modules/@roomi-fields/notebooklm-mcp/dist/index.js:70:14)
at main (file:///Users/home/.npm/_npx/012884e0010cfc5b/node_modules/@roomi-fields/notebooklm-mcp/dist/index.js:486:24)
at file:///Users/home/.npm/_npx/012884e0010cfc5b/node_modules/@roomi-fields/notebooklm-mcp/dist/index.js:498:1
at ModuleJob.run (node:internal/modules/esm/module_job:371:25)
at async onImport.tracePromise.proto (node:internal/modules/esm/loader:669:26)
at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:101:5)

This still does not work... :/

[PleasePrompto]

Will take a look, running in claude code, codex and cursor fine. I dont use libre chat. Have to take a look.