LangChain merged MCP into the main package: pip install "langchain[mcp]" exposes langchain.mcp on FastMCP with old+new spec negotiation, tool-list caching, and elicitation as LangGraph interrupts—no separate langchain-mcp-adapters install. Python ships today, TypeScript next; still beta.
Key Takeaways
- ✓Install: pip install "langchain[mcp]" — no separate langchain-mcp-adapters.
- ✓Features: FastMCP, spec negotiation, tool-list caching, elicitation as LangGraph interrupts.
- ✓Status: Python first, TypeScript next; still beta.
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