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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-opensw-1778791721-ab646b9/Y72Gt-LJTuS5x_y4/images/brand/langchain-icon.png?fit=max&auto=format&n=Y72Gt-LJTuS5x_y4&q=85&s=6ebfdb4d3fb36fc99537a325c187914d

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1778791721-ab646b9/Y72Gt-LJTuS5x_y4/images/brand/langgraph-icon.png?fit=max&auto=format&n=Y72Gt-LJTuS5x_y4&q=85&s=591eff773018ad0926168a7ab9c11fcf

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1778791721-ab646b9/Y72Gt-LJTuS5x_y4/images/brand/deep-agents-icon.png?fit=max&auto=format&n=Y72Gt-LJTuS5x_y4&q=85&s=becb99df96e97d306acd05abaaa2a4bc

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-opensw-1778791721-ab646b9/Y72Gt-LJTuS5x_y4/images/brand/deep-agents-icon.png?fit=max&auto=format&n=Y72Gt-LJTuS5x_y4&q=85&s=becb99df96e97d306acd05abaaa2a4bc

Deep Agents

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