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Agents2026-08-29 · source-backed
The 1.4.0a2 alpha ships langchain.mcp, an MCPAdapter turning any MCP server into tools you hand straight to create_agent. Connection handling is FastMCP's rather than a reimplementation, so a URL, a local stdio script, an in-process FastMCP server, a multi-server config, or a hand-built fastmcp.Client all work through one entry point. Tools from get_tools() retain the client and stay callable after the async with block exits, so the context scopes discovery and not tool lifetime. This supersedes the separate langchain-mcp-adapters package. (GitHub)
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