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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-mdrxyd-1782275112-9320b02/qbzCU1_pL44sA--u/images/brand/deep-agents-icon.png?fit=max&auto=format&n=qbzCU1_pL44sA--u&q=85&s=68bf020476dcde697e400347b09ce305

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-mdrxyd-1782275112-9320b02/qbzCU1_pL44sA--u/images/brand/langchain-icon.png?fit=max&auto=format&n=qbzCU1_pL44sA--u&q=85&s=e4f663616d22f54b5ac183d8feed80a3

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-mdrxyd-1782275112-9320b02/qbzCU1_pL44sA--u/images/brand/langgraph-icon.png?fit=max&auto=format&n=qbzCU1_pL44sA--u&q=85&s=326876e27b74ae6601d8cbd272ed8396

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.