langchain==1.4.0a3

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Third alpha of the 1.4.0 line. This release focuses on the new langchain.mcp namespace for adapting MCP servers into LangChain tools. langchain.mcp highlights MCPAdapter adapts any target fastmcp.Client accepts — a URL, a local script, an in-process server, an MCPConfig naming several servers, or a pre-built client — as well as a FastMCP ClientGroup for a fleet of servers behind one client. MCPAdapter.list_tools(*,…

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