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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-docsva-1776908745-0c598b9/e3YdvNcRc0pVVY_x/images/brand/langchain-icon.png?fit=max&auto=format&n=e3YdvNcRc0pVVY_x&q=85&s=7d046de9741456c6cd9b12a2e5960944

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-docsva-1776908745-0c598b9/e3YdvNcRc0pVVY_x/images/brand/langgraph-icon.png?fit=max&auto=format&n=e3YdvNcRc0pVVY_x&q=85&s=473ca2d6fe508c3d1995f5d1e12990cf

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-docsva-1776908745-0c598b9/e3YdvNcRc0pVVY_x/images/brand/deep-agents-icon.png?fit=max&auto=format&n=e3YdvNcRc0pVVY_x&q=85&s=b1abe8bcc9c394f130b0a5b1fabbcefc

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-docsva-1776908745-0c598b9/e3YdvNcRc0pVVY_x/images/brand/deep-agents-icon.png?fit=max&auto=format&n=e3YdvNcRc0pVVY_x&q=85&s=b1abe8bcc9c394f130b0a5b1fabbcefc

Deep Agents

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