{"$schema":"http://json-schema.org/draft-07/schema#","schemaId":"880e8400-e29b-41d4-a716-446655440099","title":"CalendarEvent","type":"object","properties":{"title":{"type":"string","description":"Event title"},"color":{"type":"string","description":"Event color (hex or named)"},"start":{"type":"string","format":"date-time","description":"Event start time (ISO 8601)"},"end":{"type":"string","format":"date-time","description":"Event end time (ISO 8601)"}},"required":["title","start","end"],"additionalProperties":false}