Overlay of your color choice (and opacity) is shaded over the target entity when your sword cooldown is ready to attack! Built in colour picker! Perfect their 1.21.11+ sword skills.
no current plans of updating it as i stick to 1.21.11 for now, later on or if requested, I may update it. Dont have the source code on this PC; will add later.
Will show when your sword is ready to fully sweep/sprint/crit. As you can see: target Entity has a lime shader, my settings are in the menu screenshot in gallery.
You can set it to show a different color (ex: red) when sword is on cooldown, personally I prefer not seeing an overlay when its on cooldown