feat(langchain): add tool error middleware - #11201
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🦋 Changeset detectedLatest commit: a721576 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Hunter Lovell (hntrl)
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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## langchain@1.5.4 ### Patch Changes - [#11201](#11201) [`a8cd4d9`](a8cd4d9) Thanks [@hntrl](https://github.com/hntrl)! - feat(langchain): add middleware for handling tool execution errors ## @langchain/anthropic@1.5.2 ### Patch Changes - [#11255](#11255) [`c8bd4c4`](c8bd4c4) Thanks [@hntrl](https://github.com/hntrl)! - feat(anthropic): add claude-opus-5 support Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Summary
Ports
ToolErrorMiddlewarefrom langchain-ai/langchain#38781 to LangChain.js. The new middleware lets agents selectively convert tool execution failures into model-visible error messages while preserving original exceptions by default.Changes
toolErrorMiddleware,ToolErrorHandler, andToolErrorMiddlewareConfigfromlangchain.ToolMessagecontent.