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Overview

Cal.com is open-source scheduling software for individuals, businesses that take calls, and developers building scheduling into their own products. Its hosted MCP server, the `calcom` CLI and API v2 check availability, create, reschedule and cancel bookings, and manage event types, schedules and private booking links. The MCP server signs in with OAuth 2.1. The CLI and the API take an API key (`cal_live_` in live mode, `cal_` in test mode) as a Bearer token: run `calcom login` once, or set `CAL_API_KEY`. Every API v2 request needs the `cal-api-version` header, set to the version its endpoint's reference names. Checking slots and creating a booking are public and need no key.