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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-replic-1777063812-aed432e/wD5QNlojAumkNaS9/images/brand/langchain-icon.png?fit=max&auto=format&n=wD5QNlojAumkNaS9&q=85&s=76193722a88b9f52ee3a8a8a68fa9eb8

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-replic-1777063812-aed432e/wD5QNlojAumkNaS9/images/brand/langgraph-icon.png?fit=max&auto=format&n=wD5QNlojAumkNaS9&q=85&s=65be09d7ffdb7ab3e7077aca91d49d71

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-replic-1777063812-aed432e/wD5QNlojAumkNaS9/images/brand/deep-agents-icon.png?fit=max&auto=format&n=wD5QNlojAumkNaS9&q=85&s=097c09b821dcc5a8ff56fb3274cc95fb

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-replic-1777063812-aed432e/wD5QNlojAumkNaS9/images/brand/deep-agents-icon.png?fit=max&auto=format&n=wD5QNlojAumkNaS9&q=85&s=097c09b821dcc5a8ff56fb3274cc95fb

Deep Agents

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