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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-1781706951-9d0138e/5vjJtocmNHh4nqnN/images/brand/deep-agents-icon.png?fit=max&auto=format&n=5vjJtocmNHh4nqnN&q=85&s=96112038f04c526076f496ef737909bf

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1781706951-9d0138e/5vjJtocmNHh4nqnN/images/brand/langchain-icon.png?fit=max&auto=format&n=5vjJtocmNHh4nqnN&q=85&s=15ed77a517b90eea9fbfd7e9e7bd6b58

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1781706951-9d0138e/5vjJtocmNHh4nqnN/images/brand/langgraph-icon.png?fit=max&auto=format&n=5vjJtocmNHh4nqnN&q=85&s=b10e0dc8b4ddfeb67d0195462bb0c2c4

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.