Composio

Composio is a developer-first integration platform built specifically to be the action layer for AI agents, the piece that lets an agent actually do things in other software rather than just talk about them. Its premise is that the hard part of building agents is rarely the model's intelligence; it is the plumbing, connecting that intelligence to hundreds of real-world APIs, each with its own authentication, schema, rate limits, and failure modes. Composio handles that plumbing so teams can focus on agent logic.

The platform exposes more than a thousand pre-built, pre-authenticated tools across apps like Slack, GitHub, Gmail, Notion, Jira, Linear, and Salesforce, each shaped for tool calling with clear schemas so a language model knows exactly how to use it. Its most distinctive piece is managed authentication: Composio handles OAuth flows, API keys, and token refresh, scoped per user, so an agent can act on behalf of a specific person without the developer building and maintaining that credential machinery. Triggers let agents subscribe to events, like a new message or ticket, and react proactively.

Composio is designed around emerging agent standards. It offers native Model Context Protocol support and a universal MCP server, Rube, that lets agents in clients like Claude Code, Cursor, and Claude Desktop reach all of those tools through a single setup. Smart tool search surfaces the right tool just in time with the appropriate scope so the agent's context stays small, and a workbench provides a sandbox pre-wired with the user's connected accounts for running multi-step actions.

For production use, the platform adds the governance that enterprise agents need: least-privilege scopes, policy controls that constrain what an agent is allowed to do, delegated-authority token exchange for auditable chains of who authorized what, observability over tool usage, and cost tracking to keep a runaway agent from generating surprise bills. It provides Python and TypeScript SDKs and a CLI, and integrates with agent frameworks like LangChain and CrewAI. Composio positions itself as purpose-built for agents, in contrast to traditional automation tools designed for linear, predefined workflows.