docs/agents/langchain-docs.md

LangChain Docs MCP

This repo uses LangChain, LangGraph, DeepAgents, and related LangChain ecosystem packages. Use current docs when changing those integration points.

MCP server

Project-local MCP configuration lives in .mcp.json:

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

Documentation index

Before exploring individual pages, fetch the complete documentation index:

https://docs.langchain.com/llms.txt

Use that index to discover the relevant LangChain, LangGraph, LangSmith, or DeepAgents page before reading deeper.

Codex CLI fallback

If the project-local .mcp.json is not picked up by your client, register the server manually:

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

If that command fails with Failed to create OAuth session, continue using the checked-in .mcp.json and retry the CLI registration after refreshing Codex authentication.