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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-1783357780-998874b/XiMJffTgHVoSKehf/images/brand/deep-agents-icon.png?fit=max&auto=format&n=XiMJffTgHVoSKehf&q=85&s=b447c0a50fec48fbb692a87aaee49d4d

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783357780-998874b/XiMJffTgHVoSKehf/images/brand/langchain-icon.png?fit=max&auto=format&n=XiMJffTgHVoSKehf&q=85&s=547286e6a077a46ac3b56d00cc70446d

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1783357780-998874b/XiMJffTgHVoSKehf/images/brand/langgraph-icon.png?fit=max&auto=format&n=XiMJffTgHVoSKehf&q=85&s=7e3c77a4eced790363caa3974cefbabb

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.