NewYour coding agent can read the release notes before it upgrades.Set up the MCP server →
npm · #3914 most downloaded on npm
Client library to connect to the LangSmith Observability and Evaluation Platform.
Last release today
02 Oct 2026
Ships on a steady schedule
a new release about every 9 days
Some releases are documented
notes for 32 of the last 60 stable releases
3 versions withdrawn
withdrawn after publishing
3 years old
457 releases · first in 2023
One column per quarter.
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
Nothing published for this version
release(js): 0.3.30 by @baskaryan in https://github.com/langchain-ai/langsmith-sdk/pull/1766
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.44...v0.3.45
feat(python,js): Add run tree method for setting usage by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/1746
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.43...v0.3.44
Nothing published for this version
fix(js): Make feedback for evaluator traces using evaluatedBy for jestlike runs apply to root runs by @jacoblee93 in https://github.com/langchain-ai/l
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.42...v0.3.43
fix(js): Trace AI SDK OTEL exported images as base64 by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/1712
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.41...v0.3.42
Hide metadata in update_run by @hinthornw in https://github.com/langchain-ai/langsmith-sdk/pull/1711
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.40...v0.3.41
Add hide_metadata support by @hinthornw in https://github.com/langchain-ai/langsmith-sdk/pull/1704
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.39...v0.3.40
fix(js): Reduce JS integration test concurrency by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/1698
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.38...v0.3.39
fix[python]: Correct client reference counting in compression thread by @angus-langchain in https://github.com/langchain-ai/langsmith-sdk/pull/1700
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.37...v0.3.38
feat[python]: OTel context propagation by @angus-langchain in https://github.com/langchain-ai/langsmith-sdk/pull/1693
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.36...v0.3.37
packaging: remove Python upper bound by @sydney-runkle in https://github.com/langchain-ai/langsmith-sdk/pull/1691
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.35...v0.3.36
feat(py): support metadata in target func by @baskaryan in https://github.com/langchain-ai/langsmith-sdk/pull/1694
Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.3.34...v0.3.35
Nothing published for this version
Your coding agent can read these notes before it upgrades. Set up the MCP server →