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-opensw-1775053779-a1257f9/X2GyHcX4YPyTpTLO/images/brand/deep-agents-icon.png?fit=max&auto=format&n=X2GyHcX4YPyTpTLO&q=85&s=cff2781bae1f8c9c1633811d685ed7f3

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1775053779-a1257f9/X2GyHcX4YPyTpTLO/images/brand/langchain-icon.png?fit=max&auto=format&n=X2GyHcX4YPyTpTLO&q=85&s=398d1726a69ca9ea595b97d6972705b0

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1775053779-a1257f9/X2GyHcX4YPyTpTLO/images/brand/langgraph-icon.png?fit=max&auto=format&n=X2GyHcX4YPyTpTLO&q=85&s=fa36c155a6800cebae47c7cc69434195

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.