# Enable LangSmith

Enable LangSmith tracing for observability into pipeline runs.

**User request:** $ARGUMENTS

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Read `CLAUDE.md` and `skills/enable-langsmith/SKILL.md` fully before doing anything.

Based on the description above, add `LANGSMITH_API_KEY`, `LANGSMITH_PROJECT`, and `LANGSMITH_TRACING=true` to `.env`. arccrew picks these up automatically on startup — no code changes needed. Show how to use LangSmith traces to compare model performance or diagnose agent failures.
