Corsair is an open-source integration platform that lets AI products connect to third-party apps via secure, multi-tenant OAuth flows, webhooks, and MCP without building or maintaining the underlying infrastructure. It supports popular services like Gmail, Slack, Notion, HubSpot, and GitHub, with built-in permission controls that require explicit user approval for destructive actions. Developers can self-host the full SDK at no cost or use the managed cloud offering with tiered pricing. Corsair is designed specifically for AI agent workflows, handling auth rotation, schema changes, and error handling across providers automatically.