CalendarMCP

A hosted alternative to self-hosted Google Calendar MCPs that works over HTTP instead of stdio, which means it runs in Claude.ai, Cursor, and other web-based clients, not just Claude Desktop. Exposes the usual calendar operations (list, create, update, delete events) plus batch_update_events for concurrent multi-event changes, find_free_time for availability queries, and quick_add_event for natural language parsing. The main trade-off is clear: your OAuth tokens live on their servers instead of your machine, but you skip the Google Cloud Console setup and get multi-account support under one API key. They also handle Google Advanced Protection accounts via service-account sharing, which most hosted services can't do. If you need calendar access in a browser-based MCP client, this is the fastest path.