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LangSmith

#ai#tools

LangSmith is an observability platform for LLM systems — traces, metrics, and evals for LangChain / LangGraph apps and anything OpenTelemetry-compatible. You see every prompt, every tool call, every intermediate thought, and can replay or diff runs to find regressions. Enable with LANGSMITH_TRACING=true + LANGSMITH_API_KEY. Essentially "Datadog for agents".