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-cwlbra-1776895976-34c974a/H3aDL1UfCYplu9oG/images/brand/deep-agents-icon.png?fit=max&auto=format&n=H3aDL1UfCYplu9oG&q=85&s=d34fe15d2dc55f2592744fdc48bd2cbc

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-cwlbra-1776895976-34c974a/H3aDL1UfCYplu9oG/images/brand/langchain-icon.png?fit=max&auto=format&n=H3aDL1UfCYplu9oG&q=85&s=0c07d94fa440df1fdd851b0d524014ff

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-cwlbra-1776895976-34c974a/H3aDL1UfCYplu9oG/images/brand/langgraph-icon.png?fit=max&auto=format&n=H3aDL1UfCYplu9oG&q=85&s=c05e257c0ebb7d5be6d1a81dc41e13ca

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.