LangSmith

LangSmith is a comprehensive agent engineering platform composed of four integrated modules: Observability, Evaluation, Deployment, and Fleet. Observability provides step-by-step execution tracing with OpenTelemetry compatibility and automated anomaly detection. Evaluation lets teams capture production traces, turn them into test cases, and score agents using LLM-as-judge evaluators and human review. Deployment offers managed production infrastructure with a centralized agent registry, versioning, instant rollbacks, and horizontal scaling. Fleet enables non-technical teams to build and manage agents through a no-code interface with tiered permissions and multi-channel distribution.