AI and ML platforms - official LangChain (LangSmith) server
LangChain docs MCP servers
Two public hosted MCP servers that let AI tools query LangChain, LangGraph and LangSmith guides (docs.langchain.com/mcp) and the API reference for all LangChain packages (reference.langchain.com/mcp). LangChain (LangSmith) hosts it at https://docs.langchain.com/mcp and needs no auth.
Last verified 2 sources
Install
Claude Code
About Claude Codeclaude mcp add --transport http docs-langchain https://docs.langchain.com/mcp
claude mcp add --transport http reference-langchain https://reference.langchain.com/mcpCodex
About Codexcodex mcp add langchain-docs --url https://docs.langchain.com/mcp
codex mcp add langchain-reference --url https://reference.langchain.com/mcpCursor
About Cursor{
"mcpServers": {
"docs-langchain": {
"url": "https://docs.langchain.com/mcp"
},
"reference-langchain": {
"url": "https://reference.langchain.com/mcp"
}
}
}VS Code
{
"servers": {
"docs-langchain": {
"url": "https://docs.langchain.com/mcp"
},
"reference-langchain": {
"url": "https://reference.langchain.com/mcp"
}
}
}Notes and caveats
- Second server URL: https://reference.langchain.com/mcp.
- The vendor snippets add both servers at once.
- The docs site is built on Mintlify and LangChain points to Mintlify's MCP documentation; the tool list is not documented on the page (a LangChain example filters to a tool named search_docs_by_lang_chain).
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Related reading
- LangChain and LangGraph in Late 2026: What Is New and Who Should Use ItLangChain 1.4 and LangGraph 1.2 added per-call approvals, built-in MCP, node timeouts and DeltaChannel. What shipped since May 2026 and who should pick it.
- LangSmith Fleet Turns Agent Ops Into On-Call WorkLangSmith Fleet turns agent ops into on-call work: the June On-Call Copilot, computer use, traces, Slack interrupts and MCP auth as one operator loop.
- LangChain Rubrics Make Agent Evals Part of the RuntimeLangChain rubrics for Deep Agents bring evals into the agent loop. Self-correction works only when rubrics are versioned, executable and checked by humans.
- How to Build an AI Agent in 2026: A Practical GuideA step-by-step guide to building AI agents that actually work. Choose a framework, define tools, wire up the loop, and ship something real.
- LangChain vs Vercel AI SDK: Which TypeScript AI Framework Should You Use?Two popular frameworks for building AI apps in TypeScript. Here is when to use each and why most Next.js developers should start with the AI SDK.
- What's New in Mastra (Late 2026): Harness, AgentController GA, Eval Gates and MCP 2.xMastra in late 2026: goals, schedules, signals, AgentController GA, eval gates and MCP 2.x, with type-checked TypeScript examples and honest tradeoffs.
FAQ
What does the LangChain docs MCP servers do?
Two public hosted MCP servers that let AI tools query LangChain, LangGraph and LangSmith guides (docs.langchain.com/mcp) and the API reference for all LangChain packages (reference.langchain.com/mcp).
How do I add the LangChain docs MCP servers to Claude Code?
LangChain (LangSmith) documents a Claude Code config; copy it from the Claude Code section of this page. Snippets for Codex, Cursor and VS Code are there too.
Does the LangChain docs MCP servers need authentication?
No. The vendor documents it as needing no auth. Transport: Streamable HTTP. Status: Unlabelled, last checked October 17, 2026.
Sources
Last verified against 2 LangChain (LangSmith) pages, then re-checked independently.
- docs.langchain.comhttps://docs.langchain.com/use-these-docs
- docs.langchain.comhttps://docs.langchain.com/langsmith/python/managed-deep-agents-mcp-connectors
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