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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-mdrxya-1776809916-8495c01/PMDRlukH2px4eygj/images/brand/langchain-icon.png?fit=max&auto=format&n=PMDRlukH2px4eygj&q=85&s=43d27d8991bf30ba0e7d4cd8dd5edbad

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-mdrxya-1776809916-8495c01/PMDRlukH2px4eygj/images/brand/langgraph-icon.png?fit=max&auto=format&n=PMDRlukH2px4eygj&q=85&s=da199658ca4ca0cbd4a44337dec361ec

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-mdrxya-1776809916-8495c01/PMDRlukH2px4eygj/images/brand/deep-agents-icon.png?fit=max&auto=format&n=PMDRlukH2px4eygj&q=85&s=6337f1157ea6cace6bbf42b6043f1c08

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-mdrxya-1776809916-8495c01/PMDRlukH2px4eygj/images/brand/deep-agents-icon.png?fit=max&auto=format&n=PMDRlukH2px4eygj&q=85&s=6337f1157ea6cace6bbf42b6043f1c08

Deep Agents

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