🔭 LangSmith

LangSmith is LangChain's production observability and evaluation platform for LLM applications. It provides distributed tracing via the @traceable decorator, a prompt Hub for version-controlled prompts, LLM-as-judge evaluations, dataset experiments, and cost and latency dashboards.

• Distributed tracing with @traceable and LangChain callbacks
• Prompt Hub — version control, A/B test, and deploy prompts
• LLM-as-judge automated quality evaluations
• Dataset experiments for regression testing and evals
• Cost and latency dashboards by model, user, and tag