LangChain: the open agent platform to own your intelligence

Run, Improve, and Govern Agents with LangSmith
Build agents fast with or without code. Choose your model. Own your harness.
Validate behavior before you ship. Turn traces into realistic datasets and eval every step.
Ship agents on infra built for long-running tasks, persistent state, and secure execution.
Catch issues in production with online evals, dashboards, and alerts built for agents.
Compound agent intelligence through a feedback loop you own.
Enforce cost limits and detect sensitive data before damage happens.
Build agents fast with any model provider. Choose the right framework for the job from batteries included to low-level control.
Klarna’s AI assistant reduced case resolution time by 80% with LangSmith
Monday Service achieved 8.7x faster feedback loops for evals with LangSmith
Podium reduced engineering escalations by 90% with LangSmith
C.H. Robinson automated 5,500 orders per day, saving 600+ hours daily with LangSmith
ServiceNow orchestrates agents across 8 customer stages using LangSmith
Use LangSmith, the agent engineering platform, to improve every step of the agent development lifecycle.