Composio

Composio is a developer-first integration platform that gives AI agents the ability to take actions in external tools. It provides 850+ pre-built connectors with managed authentication (OAuth, API keys), allowing agents built with LangChain, CrewAI, or OpenAI to interact with SaaS tools like GitHub, Slack, Gmail, and databases.

• 850+ integrations — connect AI agents to real-world tools and APIs
• Managed auth — handles OAuth flows, token refresh, and credential storage
• MCP support — native Model Context Protocol server for Claude and other MCP clients
• Framework-agnostic — works with LangChain, CrewAI, OpenAI Agents SDK, and more

AI engineers use Composio as the 'action layer' for their agents — instead of building custom API integrations for every tool, Composio provides standardized, authenticated access.

1. Sign up at composio.dev and get your API key.
2. Install the SDK:

   pip install composio-core composio-langchain

3. Connect tools via the dashboard (OAuth flows handled automatically) and use them in your agent code.

Free tier includes limited actions/month. Paid plans start at $29/mo for more actions and integrations.