The Bug:

Tools and armor used by non-player entities don't consume durability.

This is too good for auto farms to be a feature. For example, you can use multiple foxes with swords to make giant farms.

Steps to Reproduce:

1. Summon a fox holding a wooden sword with 1 durability on it by using the command provided below.

   /summon minecraft:fox ~ ~ ~ {HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{Enchantments:[{id:"minecraft:fire_aspect",lvl:1}],Damage:58}}]}

2. Summon a chicken near the fox and allow the fox to attack the chicken.
3. Take note as to whether or not swords used by non-player entities consume durability.

Observed Behavior:

The sword can be used infinitely.

Expected Behavior:

The sword breaks.