Durability Ding

Durability Ping

100% client-side, works on any server. 

When a held item or armor piece crosses a durability threshold (default 25% / 10% / 5%) you get a bell whose pitch rises the closer it is to breaking, an action-bar warning (“Diamond Pickaxe is about to break! (4%)”), and the item itself pulses above your hotbar with its remaining %.

Everything is toggleable in the config screen.