LangChain 1.4.7 adds streaming and tracing updates

News Updated AI Agent Infrastructure

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  • LangChain 1.4.7 enables stream consumers to read tool-call-delta events.
  • LangChainTracer now accepts an address.
  • The release updates dependencies including certifi, aiohttp, and mcp.

Our take

For integrations that handle streamed tool calls themselves, the new support could reduce custom event-conversion work. The release notes do not identify provider coverage or compatibility guarantees. Teams using LangChainTracer should verify how an address fits their existing tracing setup; the notes do not describe migration requirements.

Sources

  1. langchain==1.4.7 · LangChain Releases

Corrections and updates

  • Update Oct 22, 2026

    Follow-up: LangChain Core 1.7.0 changes streamed tool-call arguments

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