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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-docssu-1780674012-e7ef61e/E3ZtCYTdpowdNd7F/images/brand/deep-agents-icon.png?fit=max&auto=format&n=E3ZtCYTdpowdNd7F&q=85&s=43379728ed49779b0db21ebe58a1e98f

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-docssu-1780674012-e7ef61e/E3ZtCYTdpowdNd7F/images/brand/langchain-icon.png?fit=max&auto=format&n=E3ZtCYTdpowdNd7F&q=85&s=6314651dbe288d96b1c4cceb053af18b

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-docssu-1780674012-e7ef61e/E3ZtCYTdpowdNd7F/images/brand/langgraph-icon.png?fit=max&auto=format&n=E3ZtCYTdpowdNd7F&q=85&s=bbace3ed9ff5bc0bd97401c2cb5f104a

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.