LangSmith SDK v0.14.2 (2026-09-30): Python ls.address (#3581), JS OTel tool fields (#3592), primary replica keeps original run ids (#3623).

Key Takeaways

  • ✓Release v0.14.2 at 2026-09-30T14:41:07Z; PyPI langsmith 0.14.2
  • ✓Python ls.address agent addressing (#3581)
  • ✓JS OTel tool name/call_id/definitions (#3592)
  • ✓Only primary write replica keeps original run ids (#3623)
  • ✓Compare ahead_by 8; docs https://docs.smith.langchain.com/
LangSmith SDK 0.14.2: Python ls.address agent handle, JS OTel tool fields, primary replica keeps original run ids
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langsmith · langchain · otel
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Project Links & Resources

Direct Access
Direct access to official project resources and documentation
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LangSmith SDK v0.14.2 release
github.com/langchain-ai/langsmith-sdk/releases/tag/v0.14.2
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Compare v0.14.1...v0.14.2
github.com/langchain-ai/langsmith-sdk/compare/v0.14.1...v0.14.2
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PR #3581 ls.address
github.com/langchain-ai/langsmith-sdk/pull/3581
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PR #3592 OTel tool exports
github.com/langchain-ai/langsmith-sdk/pull/3592
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PyPI langsmith 0.14.2
pypi.org/project/langsmith/0.14.2/
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LangSmith docs
docs.smith.langchain.com/
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LangSmith Python reference
docs.smith.langchain.com/reference/python
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#3623
github.com/langchain-ai/langsmith-sdk/pull/3623
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LangSmith SDK 0.14.1
github.com/langchain-ai/langsmith-sdk/releases/tag/v0.14.1
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In-Depth Technical Analysis

Background

Agent observability needs stable addressing and OTel tool fields; replicas must not rewrite run ids.

What shipped

v0.14.2 (2026-09-30T14:41:07Z): ls.address (#3581); JS OTel tool exports (#3592); primary replica keeps original run ids (#3623).

Benchmarks

No official throughput numbers.

Get started

pip install -U "langsmith==0.14.2" — https://docs.smith.langchain.com/

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