LangSmith

LangSmith is the unified DevOps platform for the LLM application lifecycle: trace, test, evaluate, and monitor your AI agents from prototype to production.

LangSmith delivers end-to-end operational intelligence for LLM workflows, integrating observability, evaluation, and deployment into a single platform . Use its detailed tracing to gain sequential visibility into complex reasoning paths, troubleshooting issues like long response times or unexpected errors . The platform enables robust testing by letting you grow benchmarking datasets with real user data, ensuring consistent, trustworthy performance in production . It is framework agnostic, supporting both LangChain-built and custom pipelines .

https://smith.langchain.com/