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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-naomid-1776855674-a838478/veTBaPPN5zLMuaD_/images/brand/deep-agents-icon.png?fit=max&auto=format&n=veTBaPPN5zLMuaD_&q=85&s=1dec8f32b0703793ca17ac1744aaccdb

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-naomid-1776855674-a838478/veTBaPPN5zLMuaD_/images/brand/langchain-icon.png?fit=max&auto=format&n=veTBaPPN5zLMuaD_&q=85&s=98965cd1c3383b5dddbb8b9bf44dc103

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-naomid-1776855674-a838478/veTBaPPN5zLMuaD_/images/brand/langgraph-icon.png?fit=max&auto=format&n=veTBaPPN5zLMuaD_&q=85&s=07bc72236e214518daf5ac42fca3a4d6

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.