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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-naomid-1776868622-eb56ac4/pq4HZ-4W7bzeQ9c2/images/brand/deep-agents-icon.png?fit=max&auto=format&n=pq4HZ-4W7bzeQ9c2&q=85&s=7cf77a949ef40d971e2c5c8738600afc

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.
https://mintcdn.com/langchain-5e9cc07a-preview-naomid-1776868622-eb56ac4/pq4HZ-4W7bzeQ9c2/images/brand/langchain-icon.png?fit=max&auto=format&n=pq4HZ-4W7bzeQ9c2&q=85&s=cc1df34cb59240b0727526c7c111ea39

LangChain

Complete API reference for LangChain Python, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-naomid-1776868622-eb56ac4/pq4HZ-4W7bzeQ9c2/images/brand/langgraph-icon.png?fit=max&auto=format&n=pq4HZ-4W7bzeQ9c2&q=85&s=edb7d4dfceecd41cf6d88425eca20cfc

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.