Skip to main content
Comprehensive API reference documentation for the LangChain and LangGraph Python and TypeScript libraries.

Reference sites

https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783460346-e74075c/npgdLTcp07G3B-Jc/images/brand/langchain-icon.png?fit=max&auto=format&n=npgdLTcp07G3B-Jc&q=85&s=9f448ec449d3c6ba6d4d9141a0fe5553

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783460346-e74075c/npgdLTcp07G3B-Jc/images/brand/langgraph-icon.png?fit=max&auto=format&n=npgdLTcp07G3B-Jc&q=85&s=eb48eae457b930319284d9a49451e574

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783460346-e74075c/npgdLTcp07G3B-Jc/images/brand/deep-agents-icon.png?fit=max&auto=format&n=npgdLTcp07G3B-Jc&q=85&s=7ac61bd48c9769bee0f1073cb93bb0aa

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-opensw-1783460346-e74075c/npgdLTcp07G3B-Jc/images/brand/deep-agents-icon.png?fit=max&auto=format&n=npgdLTcp07G3B-Jc&q=85&s=7ac61bd48c9769bee0f1073cb93bb0aa

Deep Agents

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