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Comprehensive API reference documentation for the LangChain and LangGraph Python and TypeScript libraries.

Reference sites

https://mintcdn.com/langchain-5e9cc07a-preview-docsdy-1782337909-2539eb6/2QFwBO5UaJuPJRDl/images/brand/deep-agents-icon.png?fit=max&auto=format&n=2QFwBO5UaJuPJRDl&q=85&s=f7b53514842d65c3a41a79c7ba2c5097

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-docsdy-1782337909-2539eb6/2QFwBO5UaJuPJRDl/images/brand/langchain-icon.png?fit=max&auto=format&n=2QFwBO5UaJuPJRDl&q=85&s=6a74cb360b30e96e1293e1080b958d6f

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-docsdy-1782337909-2539eb6/2QFwBO5UaJuPJRDl/images/brand/langgraph-icon.png?fit=max&auto=format&n=2QFwBO5UaJuPJRDl&q=85&s=1941e058b631c6a99872c3338254d394

LangGraph

Complete API reference for LangGraph Python, including graph APIs, state management, checkpointing, and more.

LangChain Integrations

LangChain packages to connect with popular LLM providers, vector stores, tools, and other services.

MCP Adapter

Use Model Context Protocol (MCP) tools within LangChain and LangGraph applications.