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Documentation Index

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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-docsup-1779999816-f03693e/1qwS37AXt8b9rXw-/images/brand/langchain-icon.png?fit=max&auto=format&n=1qwS37AXt8b9rXw-&q=85&s=9bc43a06e4f5a5600014589b86b6bf3e

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-docsup-1779999816-f03693e/1qwS37AXt8b9rXw-/images/brand/langgraph-icon.png?fit=max&auto=format&n=1qwS37AXt8b9rXw-&q=85&s=895b459aa54d7335a821c00298e5e344

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-docsup-1779999816-f03693e/1qwS37AXt8b9rXw-/images/brand/deep-agents-icon.png?fit=max&auto=format&n=1qwS37AXt8b9rXw-&q=85&s=e5c7ae04379d5f1ae0ca3473a19b948c

Deep Agents

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

MCP Adapter

Use Model Context Protocol (MCP) tools within LangChain and LangGraph applications.
https://mintcdn.com/langchain-5e9cc07a-preview-docsup-1779999816-f03693e/1qwS37AXt8b9rXw-/images/brand/deep-agents-icon.png?fit=max&auto=format&n=1qwS37AXt8b9rXw-&q=85&s=e5c7ae04379d5f1ae0ca3473a19b948c

Deep Agents

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