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LangChain.js Release Notes & Changelog

langchain-ai/langchainjs

The latest LangChain.js release is langchain@1.6.1, published on .

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18,320 starsTypeScriptlangchain@1.6.1
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LangChain.js release notes

LangChain.js langchain@1.6.1

Latest
Official release notes

Patch Changes

  • #11437 272d651 Thanks @zhdanovartur! - fix(langchain): humanInTheLoopMiddleware — execute approved, edited and auto-approved tool calls when other calls in the same interrupt are rejected, instead of dropping them without a ToolMessage (caused "400 No tool output found for function call" on subsequent model requests)

LangChain.js @langchain/core@1.3.4

Official release notes

Patch Changes

  • #12104 e006308 Thanks @hntrl! - Export omitPayload from @langchain/core/tracers/tracer_langchain, a TracePolicy processor that records an empty payload while keeping the run.
  • #12102 6d157ae Thanks @hntrl! - LangChainTracer now still sends and ends a run when its trace policy's processInputs or processOutputs throws, with that payload dropped and the error set, instead of skipping the run or leaving it pending in LangSmith.

LangChain.js @langchain/aws@1.5.2

Official release notes

Patch Changes

  • #12100 dc74e55 Thanks @hntrl! - Replay signed Bedrock reasoning blocks whose text is empty or missing instead of dropping them, so models that omit the thinking summary (e.g. Claude Sonnet 5, which defaults to display: "omitted") no longer fail with an HTTP 400 on the turn after a tool call. A missing text is sent as "", and an empty signature counts as unsigned. Whitespace-only text after reasoning is no longer merged into the reasoning block, and a standard reasoning block split into parts is joined before replay.

Looking for an older version? The full LangChain.js changelog is on the official langchain-ai/langchainjs releases page.

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