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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-messag-1776878057-81ae107/efszqVfajN1Eiimq/images/brand/deep-agents-icon.png?fit=max&auto=format&n=efszqVfajN1Eiimq&q=85&s=ad660418eddd8010116e8998c71b116b

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-messag-1776878057-81ae107/efszqVfajN1Eiimq/images/brand/langchain-icon.png?fit=max&auto=format&n=efszqVfajN1Eiimq&q=85&s=62724abcf3403035ad453c2484239d82

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-messag-1776878057-81ae107/efszqVfajN1Eiimq/images/brand/langgraph-icon.png?fit=max&auto=format&n=efszqVfajN1Eiimq&q=85&s=56b815a212848e066bdfc177b6479d77

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.