LangChain Docs MCP: what works in Claude, ChatGPT, Cursor, and Grok Bot
LangChain docs remote MCP server: search LangChain, LangGraph and LangSmith docs. No sign-in needed.
Registry name: (v)
Set it up
URL https://docs.langchain.com/mcp. No sign-in. Paste the URL and it connects. Copy-paste setup: Claude | Claude Code | Cursor | VS Code | ChatGPT
Status grid
| App | Status | Date tested |
|---|---|---|
| Claude | Untested | Not yet tested |
| ChatGPT | Untested | Not yet tested |
| Cursor | Untested | Not yet tested |
| Grok Bot | Untested | Not yet tested |
| MCP Inspector (reference client) | Untested | Not yet tested |
| MCP TypeScript SDK (reference client) | Partial | Fri Oct 16 2026 |
Hands-on test results
| App | Task | Result | Time | Detail | Date tested |
|---|---|---|---|---|---|
| MCP TypeScript SDK (reference client) | connect (no auth) | Works | 427 ms | Connected without sign-in in 427 ms. | Oct 16, 2026, 4:45 PM CT |
| MCP TypeScript SDK (reference client) | list tools | Works | 182 ms | 3 tools: search_docs_by_lang_chain, query_docs_filesystem_docs_by_lang_chain, submit_feedback. | Oct 16, 2026, 4:45 PM CT |
| MCP TypeScript SDK (reference client) | search docs ("LangGraph checkpointer") | Works | 467 ms | search_docs_by_lang_chain: about 52 KB returned. "Title: Checkpointer libraries Link: https://docs.langchain.com/oss/javascript/langgraph/checkpointers#checkpointer-libraries Page: oss/javas" | Oct 16, 2026, 4:45 PM CT |
| MCP TypeScript SDK (reference client) | browse docs filesystem (ls /) | Works | 114 ms | query_docs_filesystem_docs_by_lang_chain: 107 characters returned. "exit: 0 --- stdout --- api-reference build-overview.mdx index.mdx langsmith openapi oss use-these-docs.mdx " | Oct 16, 2026, 4:45 PM CT |
| MCP TypeScript SDK (reference client) | search with nonsense query | Partial | 496 ms | search_docs_by_lang_chain: about 108 KB returned. "Title: Set up LLM-as-a-judge online evaluators Link: https://docs.langchain.com/langsmith/online-evaluations-llm-as-judge Page: langsmith/on" | Oct 16, 2026, 4:45 PM CT |
| MCP TypeScript SDK (reference client) | error handling (number as query) | Works | 78 ms | search_docs_by_lang_chain: tool error, 117 characters returned. "Input validation error: Invalid arguments for tool search_docs_by_lang_chain: query: Expected string, received number" | Oct 16, 2026, 4:45 PM CT |
Oct 16, 2026, 4:45 PM CT, MCP TypeScript SDK (reference client): Scripted client using the official MCP TypeScript SDK v1.32.1 against https://docs.langchain.com/mcp (Streamable HTTP, protocol 2025-11-25). No sign-in needed. Mintlify-hosted docs server (search plus a read-only docs filesystem). Server Docs by LangChain v1.0.0. Read-only server, so no create task. 5 of 6 tasks passed.
Automated handshake
No public remote endpoint to check (local or package-only server).
Gotchas
- MCP TypeScript SDK (reference client): Search results are large (about 52 KB for one query).
- MCP TypeScript SDK (reference client): A nonsense query returned about 108 KB of unrelated docs instead of an empty result.
Errors and fixes
- MCP tool results too large: context window blown by one call
- MCP search returns results for nonsense queries
FAQ
Does the LangChain Docs MCP server work?
In our hands-on test on Oct 16, 2026, 5 of 6 tasks passed. Main gotcha: Search results are large (about 52 KB for one query).
What is the LangChain Docs MCP server URL?
https://docs.langchain.com/mcp (Streamable HTTP).
Does the LangChain Docs MCP server need sign-in?
No sign-in. Paste the URL and it connects.
How do I add the LangChain Docs MCP server to Claude, Cursor, VS Code or ChatGPT?
Follow our copy-paste setup guides: https://connectorreport.com/c/langchain-docs/setup/claude https://connectorreport.com/c/langchain-docs/setup/claude-code https://connectorreport.com/c/langchain-docs/setup/cursor https://connectorreport.com/c/langchain-docs/setup/vscode https://connectorreport.com/c/langchain-docs/setup/chatgpt
What errors does the LangChain Docs MCP server give?
MCP tool results too large: context window blown by one call. MCP search returns results for nonsense queries.
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