Composio documentation

What it does

A hosted integration/auth platform that lets AI agents and MCP clients call actions across 1,000+ SaaS apps (HubSpot, Slack, Gmail, GitHub, Notion, Stripe, and others) through Composio-managed OAuth.

Access and connection

MCP support: official

Access requirements: free (100K tool calls/mo, 50K trigger events/mo, unlimited connections on the Free plan, no credit card)

Authentication: Composio brokers OAuth for each connected toolkit (HubSpot, Gmail, Slack, etc.) on the user's behalf, then gates the MCP endpoint itself with an x-api-key header (required by default for new orgs). MCP endpoint pattern is https://backend.composio.dev/v3/mcp/{server_id}?user_id={user_id}.

Research checked: 2026-09-07

These details come from the catalog research. Check the vendor sources below for current setup instructions. They do not establish that a connection or tool call was tested.