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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-skills-1780669185-dd23e4a/yJiSixzsPmdoDVCb/images/brand/deep-agents-icon.png?fit=max&auto=format&n=yJiSixzsPmdoDVCb&q=85&s=d04bf4de75c2056e90b4d6676986cefb

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-skills-1780669185-dd23e4a/yJiSixzsPmdoDVCb/images/brand/langchain-icon.png?fit=max&auto=format&n=yJiSixzsPmdoDVCb&q=85&s=f5eece58f2bbfee2df8a5a5b44d67e92

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-skills-1780669185-dd23e4a/yJiSixzsPmdoDVCb/images/brand/langgraph-icon.png?fit=max&auto=format&n=yJiSixzsPmdoDVCb&q=85&s=2d23fb0bdec67dad9b707e10c79a0a79

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.