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On a MacBook Pro with a PROLED XDR display, the lit Apple logo on the lid can blink while agents work and stop when they finish, so a run can be read from across the room. View > Blink Apple Logo While Agents Work picks a style (Calm, Slow, Wink, Heartbeat, Fast). It is off by default, and the menu exists only on a Mac that has the logo. Apple documents one control for the logo, `sudo defaults write com.apple.CoreBrightness LEBacklightMode -int 0`. The same setting is a property of BrightnessSystemClient in the private CoreBrightness framework, which a process of the logged-in user can set with no administrator, so nothing here needs a helper or a password. The setting is system-wide and survives a reboot, and the release profile has panic = "abort", so the work runs in a child process (this binary with --logo-blink) tied to the app by a pipe. When the pipe closes, however the app ended, the child restores the logo and exits. A marker file covers power loss and a SIGKILL of the child itself. The child asks api/sessions itself: WebKit stalls the event stream of a hidden page, which lost whole turns and ran a blink 39 s past the end. It sends the session cookie of its first answer with every poll, because a good password without a cookie creates a login session each time and Codeman evicts the oldest of 100. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>