Build context-aware reasoning applications with LangChain’s flexible abstractions and AI-first toolkits.
Core OSS libraries:
LangChainandLangChain.js– reusable components and integrations for building LLM applicationsLangGraphandLangGraph.js– build LLM agents as graphsDeepAgentsandDeepAgents.js– agents that can plan, use subagents, and leverage file systems for complex tasks
Commercial Platform:
LangSmith– platform for building and monitoring production-grade LLM applications
OSS extensions and apps:
Open SWE– open source asynchronous coding agentMCP Adapters– make MCP tools compatible with LangChain and LangGraphOpen Canvas– document & chat-based UX for writing code or markdown. Inspired by OpenAI's Canvas (TypeScript)OpenGPTs– open source version of OpenAI's GPTs API (Python)Email assistant– AI assistant that helps you maintain your emails (Python)LangChain + Next.js template– template LangChain.js + Next.js applicationSocial media agent– agent for sourcing, curating, and scheduling social media posts with human-in-the-loop (TypeScript)Agent Protocol– our attempt at codifying the framework-agnostic APIs that are needed to serve LLM agents in production
- Documentation – unified docs for LangChain projects and services (source)
- Community forum – discuss, get help, and talk shop
- LangChain Academy – comprehensive, free courses on LangChain libraries and products, made by the LangChain team