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.
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