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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-bigque-1776354254-0662958/oN4TzcLkHJNCg9OB/images/brand/langchain-icon.png?fit=max&auto=format&n=oN4TzcLkHJNCg9OB&q=85&s=ec1ec8815d58c86253f73555eda378e2

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-bigque-1776354254-0662958/oN4TzcLkHJNCg9OB/images/brand/langgraph-icon.png?fit=max&auto=format&n=oN4TzcLkHJNCg9OB&q=85&s=a75d7cf6bee0c35d0284d49e74f5afa8

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-bigque-1776354254-0662958/oN4TzcLkHJNCg9OB/images/brand/deep-agents-icon.png?fit=max&auto=format&n=oN4TzcLkHJNCg9OB&q=85&s=b0fc8578cbe4296b314bf48735a02e86

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks

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.
https://mintcdn.com/langchain-5e9cc07a-preview-bigque-1776354254-0662958/oN4TzcLkHJNCg9OB/images/brand/deep-agents-icon.png?fit=max&auto=format&n=oN4TzcLkHJNCg9OB&q=85&s=b0fc8578cbe4296b314bf48735a02e86

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.