Composio is a managed integration layer that exposes 250+ apps — Gmail, Slack, GitHub, Notion, Linear, Calendar and more — to AI agents over MCP, handling OAuth and tokens for you. Instead of running a separate server per app, you get managed MCP endpoints. Here's how it works.
How it works
Rather than installing one MCP server per tool, you create MCP server URLs in the Composio dashboard for the apps you want, authorise each app once (Composio manages the OAuth), and add the resulting endpoint to your client. Composio handles credential storage, refresh and multi-user auth.
Setup
- Create a Composio account and pick the toolkits (apps) you want.
- Authorise each app through Composio's hosted OAuth.
- Copy the generated MCP server URL and add it as a remote connector:
{
"mcpServers": {
"composio": {
"url": "https://mcp.composio.dev/<your-server-id>"
}
}
}
The exact URL comes from your dashboard. Composio also offers a CLI/SDK to scaffold this. Restart the client; see MCP config file location.
When to use Composio vs individual servers
- Composio: you want many apps fast, managed auth, and multi-user support — great for breadth.
- Individual servers (e.g. Slack, GitHub, Notion): you want full control, self-hosting, or just one or two tools.
Verify
Ask: "Using Composio, list my unread Gmail and create a Linear issue from the most urgent one." Cross-app action confirms it works.
Security
Composio holds OAuth tokens for the apps you connect — review what each toolkit can do, grant least privilege, and treat it like any third party with access to your accounts. See how to vet an MCP server and MCP security best practices.
Going further
Browse the developer tools category or curated loadouts. For a single-vendor breadth alternative, compare with running dedicated servers from our directory.