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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-change-1777044857-ea661c3/LPfJb_iP7eIj90AW/images/brand/langchain-icon.png?fit=max&auto=format&n=LPfJb_iP7eIj90AW&q=85&s=a4782cdb0005215788364f80836a28c7

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-change-1777044857-ea661c3/LPfJb_iP7eIj90AW/images/brand/langgraph-icon.png?fit=max&auto=format&n=LPfJb_iP7eIj90AW&q=85&s=0a14b46394c799b5d9206dd2f0051dbb

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-change-1777044857-ea661c3/LPfJb_iP7eIj90AW/images/brand/deep-agents-icon.png?fit=max&auto=format&n=LPfJb_iP7eIj90AW&q=85&s=0c033b3eed9f645940fe096091863fb2

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks

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.
https://mintcdn.com/langchain-5e9cc07a-preview-change-1777044857-ea661c3/LPfJb_iP7eIj90AW/images/brand/deep-agents-icon.png?fit=max&auto=format&n=LPfJb_iP7eIj90AW&q=85&s=0c033b3eed9f645940fe096091863fb2

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.