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Documentation
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+ LangChain is the platform for agent engineering. AI teams at Replit, Clay, Rippling, Cloudflare, Workday, and more trust LangChain's products to engineer reliable agents.
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+ Our **open source frameworks** help you build agents:
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+ - [**LangChain**](/oss/python/langchain/overview) helps you quickly get started building agents, with any model provider of your choice.
+ - [**LangGraph**](/oss/python/langgraph/overview) allows you to control every step of your custom agent with low-level orchestration, memory, and human-in-the-loop support. You can manage long-running tasks with durable execution.
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+ [**LangSmith**](/langsmith/home) is a platform that helps AI teams use live production data for continuous testing and improvement. LangSmith provides:
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+ - **Observability** to see exactly how your agent thinks and acts with detailed tracing and aggregate trend metrics.
+ - **Evaluation** to test and score agent behavior on production data and offline datasets for continuous improvement.
+ - **Deployment** to ship your agent in one click, using scalable infrastructure built for long-running tasks.
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+ Get started
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+ Open source agent frameworks
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+ Quickly get started building agents, with any model provider of your choice.
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+ Control every step of your custom agent with low-level orchestration, memory, and human-in-the-loop support.
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+ Quickly get started building agents, with any model provider of your choice.
+
+
+ Control every step of your custom agent with low-level orchestration, memory, and human-in-the-loop support.
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+ LangSmith
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+ See exactly how your agent thinks and acts with detailed tracing and aggregate trend metrics.
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+ Test and score agent behavior on production data or offline datasets to continuously improve performance.
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+ Iterate on prompts with version control, prompt optimization, and collaboration features.
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+ Ship your agent in one click, using scalable infrastructure built for long-running tasks.
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