Skip to main content
Comprehensive API reference documentation for the LangChain and LangGraph Python and TypeScript libraries.

​
Reference sites

https://mintcdn.com/langchain-5e9cc07a-preview-daniel-1776850929-9d0071d/yuPzYaUE1Dv7V9ER/images/brand/deep-agents-icon.png?fit=max&auto=format&n=yuPzYaUE1Dv7V9ER&q=85&s=9b0823da9eee944894b35ed08473b60f

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-daniel-1776850929-9d0071d/yuPzYaUE1Dv7V9ER/images/brand/langchain-icon.png?fit=max&auto=format&n=yuPzYaUE1Dv7V9ER&q=85&s=98aa5935d1a3aa71c42b8fd2f1ebc6e4

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-daniel-1776850929-9d0071d/yuPzYaUE1Dv7V9ER/images/brand/langgraph-icon.png?fit=max&auto=format&n=yuPzYaUE1Dv7V9ER&q=85&s=5199f04aef1222bbf57cf61f07e1e11b

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.
Edit this page on GitHub or file an issue.
Connect these docs to Claude, VSCode, and more via MCP for real-time answers.