It would be hugely beneficial to modders if the "damaged=false" predicate could be used in conjunction with "damage" to provide override models for Unbreakable tools that have a damage value set.
Alternately, an "unbreakable" predicate would work wonders.
Giving modders the ability to add custom items to the game without affecting the stock versions that players get via crafting would be amazing.
this is a feature request, not a bug, feature requests go to the reddit.