Known limitations

The first beta is local, single-user software for Apple silicon running macOS 15.6–26.x.
ChatGPT web cannot start the local stdio helper directly.
Apple Mail requires a configured account and macOS Automation access.
Attachments are not read, created, or modified.
Recurrence is limited to the documented EventKit-safe RRULE profile.
Subscribed and read-only calendars cannot be modified; birthday calendars may be available as read-only.
New Mail accounts and calendars are never selected automatically.
Sending Mail and deleting Mail or Calendar items require exact, expiring confirmation.
There is no automatic updater, central management service, publisher telemetry, or remote uninstall.
Removing the app does not automatically remove preferences, Application Support data, Keychain items, TCC records, or exported diagnostics.
Intel Macs and macOS 13/14 are outside the first beta support claim.
The MCB 4.5-equivalent gate is a local maintainability target, not an official SIG/Sigrid certification.