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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-opensw-1782332329-96d87c7/nRHyMivvoENVCdkG/images/brand/deep-agents-icon.png?fit=max&auto=format&n=nRHyMivvoENVCdkG&q=85&s=eb98715ac3bccb18220f6deffb03dc69

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1782332329-96d87c7/nRHyMivvoENVCdkG/images/brand/langchain-icon.png?fit=max&auto=format&n=nRHyMivvoENVCdkG&q=85&s=1504d68aa8d111ff40d217279bb13a9c

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1782332329-96d87c7/nRHyMivvoENVCdkG/images/brand/langgraph-icon.png?fit=max&auto=format&n=nRHyMivvoENVCdkG&q=85&s=8877a88496c1659c479cb38735f18eac

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.