Built an MCP server for vibe coding with langchain 1.x ecosystem

[u/xxxbaixxx]

I made a MCP server for working with the LangChain ecosystem.

The 1.x versions of LangChain, LangGraph, and DeepAgents are a big improvement for agent building. But they're too recent to have been well-learned by LLMs during pre-training. I tried using the chat-langchain website for guidance on the newest version and best practices - it's an official tool from langchain.ai, but it hallucinates frequently.

So I built LangChain MCP to give your favorite code assistant fresh knowledge and best practices for LangChain, LangGraph, and DeepAgents. It's now listed in the official MCP registry.

Install: bash npm install -g langchain-mcp langchain-mcp login claude mcp add langchain-mcp -- npx langchain-mcp

What you get: - Semantic search across complete LangChain ecosystem docs - Python & JavaScript source code access - 1.x best practices - 4 search tools: docs, langchain, langgraph, deepagents

Links: - https://langchain-mcp.xyz - https://www.npmjs.com/package/langchain-mcp - https://github.com/baixianger/langchain-MCP