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Tools/LangSmith

LangSmith

Observability and evaluation platform for debugging LLM applications, from the LangChain team.

langchain.com
Screenshot of LangSmith

What is LangSmith?

LangSmith lets developers trace, debug, test, and monitor LLM-powered applications in production, showing exactly what prompts, tool calls, and outputs happened at each step of a chain or agent.

Key features

  • Full tracing of LLM app execution
  • Prompt and output evaluation tooling
  • Works with or without LangChain
  • Production monitoring and alerting

Pricing

Freemium

Free tier with usage limits; paid plans scale by trace volume, with enterprise options.

Verify on the official pricing page →

LangSmith use cases

  • 1Debugging why an LLM agent misbehaved
  • 2Evaluating prompt changes before shipping
  • 3Monitoring LLM app performance in production
  • 4Tracing multi-step agent/chain execution

Who is LangSmith for?

Developers building LLM appsAI engineering teams

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