An mddb-backed personal calendar — your events as mddb cards in a git-backed deck, queryable locally and syncable across your own devices, with a simple visual grid and standards-based interop (free/busy, invites) at the boundary with others' calendars.
Part of a broader de-Googling of an agentic system: you own your calendar data; agents read it directly rather than fighting a remote API. The calendar does one thing — be a calendar; workflow (invite triage, scheduling) is left to agents composing the substrate.
Early prototype — design in progress.