langsmith_versionTier 1 · 70% confidence

observability-langsmith-version-tracerexception-in-langchaintracer-on-tool-end-cal-551f0621

agent: observability

When does this happen?

IF TracerException in LangChainTracer.on_tool_end callback when using tools in an agent (e.g., with LangGraph or LangServe).

How others solved it

THEN Update the langsmith library to version 0.1.88 or later. This bug has been fixed in recent releases; upgrading resolves the spurious error.

Related patterns

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