LangChain builds an agent development platform alongside open source frameworks for building AI agents. The company frames the work as helping teams observe, evaluate, and deploy reliable AI agents.

LangSmith is the central agent engineering platform, covering tracing and debugging, evaluation with human review and automated scoring, deployment infrastructure with async collaboration, and monitoring across the agent development lifecycle. It is framework agnostic, with SDKs for Python, TypeScript, Go, and Java. LangSmith Engine surfaces and diagnoses undetected issues autonomously, and LangSmith Fleet targets routine company wide tasks described in plain language.

The open source side covers LangChain for starting agents against any model provider, LangGraph for building reliable agents with low level control, and deepagents for long running agents on complex tasks.

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