
Tracing, evaluation and deployment for LLM apps and agents
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LangSmith is the observability and evaluation service from LangChain, the open source framework for building applications on large language models. It records each step an app or agent takes so developers can see where a run went wrong. Teams use it to debug prompts, test changes against datasets, monitor production traffic and deploy agents. It works with LangChain and LangGraph but can trace other code as well. A free plan covers small projects, with paid plans for teams.
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