LangSmith traces and evaluates AI agents across LangChain, OpenAI, Anthropic, Vercel AI SDK, LlamaIndex, and custom stacks. It captures model and tool trajectories, latency and cost, supports online and offline evaluations, clusters failure patterns, and can alert teams when production quality regresses.
Overview
Websitewww.langchain.com/langsmith
Authapi key
PricingFree tier available · $0 with 5,000 base traces/month
SDKspython, typescript, go, java
OpenAPINo
MCP SupportNo