LangChain Docs MCP server

Public docs-search MCP server for LangChain's documentation, exposing a SearchDocsByLangChain tool over conceptual guides, how-tos, tutorials, and product docs for LangChain, LangGraph, and LangSmith. It supports filters to return only API reference pages or only code snippets; a companion server at reference.langchain.com/mcp covers full API signatures.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by LangChain

MCP endpoint (Streamable HTTP)

https://docs.langchain.com/mcp

Vendor documentation

What you can do with it

Search LangChain, LangGraph, and LangSmith guides and how-tos.
Restrict results to code snippets only.
Pull current docs into a coding agent before writing LangChain code.
Pair with the reference.langchain.com/mcp server for full API signatures.

Tools advertised by the last live check:

search_docs_by_lang_chain
query_docs_filesystem_docs_by_lang_chain
submit_feedback

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http langchain-docs https://docs.langchain.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add langchain-docs --url https://docs.langchain.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable langchain-docs in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "langchain-docs": {
      "url": "https://docs.langchain.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "langchain-docs": {
      "type": "streamableHttp",
      "url": "https://docs.langchain.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start langchain-docs and inspect its tools.

VS Code configuration

{
  "servers": {
    "langchain-docs": {
      "type": "http",
      "url": "https://docs.langchain.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http langchain-docs https://docs.langchain.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "langchain-docs": {
      "url": "https://docs.langchain.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "langchain-docs": {
      "serverUrl": "https://docs.langchain.com/mcp"
    }
  }
}

See all 248

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