Summary
LangChain 1.4.0a3 introduces a langchain.mcp namespace that adapts MCP servers into LangChain tools from URLs, local scripts, in-process servers or prebuilt clients. Its elicitation interrupt mode surfaces server questions as LangGraph interrupts so a human can answer and resume the run, with optional tool-discovery caching.
Why it matters
MCP is becoming an integration boundary, and turning its servers into first-class tools reduces custom glue while preserving a human checkpoint for interactive workflows. The release makes tool discovery and interruption semantics part of the framework contract.
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