LangChain folds MCP support into the main package
LangChain rebuilt its MCP support around the July stateless spec: MCP moves from the separate langchain-mcp-adapters install into langchain.mcp in the main package (langchain[mcp]>=1.4.0, beta), MultiServerMCPClient collapses into one MCPAdapter rebuilt on FastMCP, and per-connection negotiation covers servers on both protocol generations. It adds elicitation via LangGraph interrupts and client-side tool-list caching. Python ships first, TypeScript to follow.
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FAQWhat did LangChain announce on SEP 03, 2026?
LangChain rebuilt its MCP support around the July stateless spec: MCP moves from the separate langchain-mcp-adapters install into langchain.mcp in the main package (langchain[mcp]>=1.4.0, beta), MultiServerMCPClient collapses into one MCPAdapter rebuilt on FastMCP, and per-connection negotiation covers servers on both protocol generations. It adds elicitation via LangGraph interrupts and client-side tool-list caching. Python ships first, TypeScript to follow.
What is LangChain?
LangChain the company ships an agent engineering platform on top of the open-source LangChain and LangGraph frameworks. LangSmith is the commercial observability and evaluation layer — tracing, automatic evaluators (Perceived Error and more), preview deployments from PR branches, and AgentCore Payments middleware that lets agents transact through the x402 flow with session-level spending limits.
Where is the official source for this announcement?
It was published by LangChain on SEP 03, 2026 via langchain.com, the company's official channel. AgentMaps cites the primary source for every charted signal.