A full-width red bar along one edge of your Mac screen that tells you if Claude Code is still working on your task. I built this so I could see it from across the room. I also added a tiny sound that plays when the task completes. Everything is customizable.
Im not sure if a flashing bar is what I would be personally looking for personally (irrelevant as I have 0 macOS machines) but I love the concept of an OS wide Claude indicator, Im often running multiple sessions in different terminal windows/tabs. This looks like it could be the start of something really slick.