Crash on macOS 26 (Tahoe): Incorrect actor executor assumption

[gabac]

Environment

• macOS version: 26.2 (Build 25C56)
• remindctl version: 0.1.0
• Installation: Homebrew (brew install steipete/tap/remindctl)

Issue

Any command that accesses reminders crashes with a Swift actor isolation error.

Steps to Reproduce

1. Install remindctl on macOS 26 (Tahoe)
2. Grant Reminders access (remindctl authorize)
3. Run any command that fetches reminders:
   • remindctl
   • remindctl list
   • remindctl all

Expected Behavior

Reminders are listed.

Actual Behavior

Crash with SIGABRT:

Incorrect actor executor assumption; expected 'RemindCore.RemindersStore' executor.

Command aborted by signal SIGABRT

Notes

• remindctl status works fine (only checks permissions, doesn't access RemindersStore)
• remindctl --version works fine
• Likely a Swift 6 strict concurrency issue with actor isolation in the newer macOS

Workaround

AppleScript still works as a fallback:

osascript -e 'tell application "Reminders" to get name of every reminder of list "Reminders" whose completed is false'

[chris-sev]

Confirming this issue on my setup as well.

Environment:

• macOS 15.3 (Tahoe) on M4 Max
• remindctl 0.1.0 via Homebrew

What works:

• remindctl add --title "Test" --due tomorrow ✅
• remindctl status ✅
• remindctl --version ✅

What crashes:

• remindctl (default today view)
• remindctl list
• remindctl today
• remindctl all

All read operations fail with:

Incorrect actor executor assumption; expected 'RemindCore.RemindersStore' executor.

Workaround I'm using:
AppleScript for reading (slow but works):

osascript -e 'tell application "Reminders" to get name of reminders whose completed is false'

Note: Getting due dates via AppleScript iteration is painfully slow (60+ sec) and often times out. Would love a fix for remindctl!

[tobalsan]

Note it's not only on Tahoe. I'm still on Sequoia (15.7.3) and experience the same thing.

[steipete]

Fixed in v0.1.1.

Root cause: EventKit’s fetchReminders(matching:) completion handler runs off the actor executor; we were calling actor-isolated code (self.item(from:) / self.calendar) from that callback, triggering Swift 6 strict-concurrency runtime abort.

Fix: extract reminder fields in the callback into a small Sendable struct, then hop back to the actor to build ReminderItem (PR #3, merged).

Release: v0.1.1 published 2026-01-11; Homebrew formula updated to 0.1.1.

[steipete]

Closing — fixed in v0.1.1 (see details above).