Attention

macOS has no way to ask how many notifications a window has, but titles carry it often enough, and yabai reports them without any permission:

• Ghostty puts 🔔 in front of a terminal's title when it rings the bell, until you focus it. Agents and long commands that ring it when they finish or need input show up this way.
• Mail, chat and web apps put a count in front: (3) Inbox, [12] Slack.

Such a window gets a red badge on its icon or tab (the count, or a dot); a pill turns red. Its space gets a bar under it in the menu bar, so you see it from any space. yabar focus attention goes to the next one, and the launcher shows them with a badge.

Turn it off under Settings → Stacks.