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WonderCal

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OpenScheduler is WonderCal’s MIT-licensed, off-the-shelf scheduling toolkit for people building AI scheduling workflows. It provides ready-to-use MCP, REST, Claude-agent, and webhook components for syncing Google Calendar, Microsoft Outlook, and Apple Calendar. WonderCal’s hosted service adds multi-person availability, group scheduling, required and optional participants, cross-company coordination, fallback availability collection, and completed booking across calendar domains. Together, they let AI assistants coordinate and finish complex meetings without sending participants a booking link or exposing private calendar details.

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