Composio is an integration platform and SDK ecosystem that gives AI agents access to more than a thousand application toolkits together with authentication, user sessions, triggers, and sandboxed execution. Its purpose is to let agents move from generating text to taking authenticated actions across external software and services.

The repository contains TypeScript and Python SDKs, a command-line interface, and adapters for agent frameworks including OpenAI Agents, Anthropic tooling, Vercel AI SDK, LangChain, and others. Sessions can dynamically discover and execute tools without loading every tool definition into context, and can also expose a hosted MCP endpoint for compatible clients.

Composio is useful for developers building agents that need to work with real user accounts and third-party applications. It centralizes much of the difficult integration layer—tool discovery, credentials, connections, session reuse, and framework adaptation—so application teams can focus on agent behavior and user workflows rather than implementing every API integration independently.