LAC-4305 / PR #816 -- evidence that 'open clock-timer:' opens Clock on its Timers tab
Captured 2026-10-14 23:43:33 EDT on macOS 26.6.2 (arm64)

NOTE: no screenshot. The Screen Recording permission is not granted to the agent
process on this Mac, so screencapture fails ('could not create image from display').
The accessibility readout below is the stronger evidence anyway: it proves which tab
Clock actually selected, which a picture of Clock would not.

=== 1. Clock.app is not scriptable, so no timer can be started or read back ===
$ sdef /System/Applications/Clock.app
sdef: couldn't get sdef for /System/Applications/Clock.app (error -192)
$ PlistBuddy -c 'Print :OSAScriptingDefinition' .../Clock.app/Contents/Info.plist
Print: Entry, ":OSAScriptingDefinition", Does Not Exist

=== 2. Clock's only automation surface is an open-tab intent, and it is URLRepresentable ===
$ strings .../WorldClockWidget.appex/.../extract.actionsdata | (OpenTabIntent excerpt)
"com.apple.link.systemProtocol.URLRepresentable"
"com.apple.link.systemProtocol.URLRepresentable"]
"identifier":"OpenTabIntent"
"identifier":"timer"}
"key":"TIMERS"

=== 3. LaunchServices names the URL behind it ===
$ lsregister -dump | grep 'claimed schemes' (Clock's claim)
claimed schemes:            clock-alarm:, clock-sleep-alarm:, clock-stopwatch:, clock-timer-running:, clock-timer:, clock-worldclock:

=== 4. Opening it selects the Timers tab (the result the feature promises) ===
$ open clock-timer:
exit=0
$ osascript -- read each toolbar radio button back over the accessibility API
World Clock value=0
Alarms value=0
Stopwatch value=0
Timers value=1
                                              ^ value=1 is the selected tab

=== 5. No duration can ride the URL, which is why none is parsed ===
open clock-timer://300  -> selected tab: Timers  (tab opens, the rest is ignored; no timer is created)
open clock-timer:300  -> selected tab: Timers  (tab opens, the rest is ignored; no timer is created)
open clock-timer://?duration=300  -> selected tab: Timers  (tab opens, the rest is ignored; no timer is created)