The Salvage enchantment is an enchantment that makes it so that when the tool, weapon, or armor piece breaks, it will provide you with a certain amount of the resource used to make it. Said amount depends on the item in question, with armor pieces giving more and shovels only giving the bare minimum. For exact materials:

Wood: Wooden Planks

Stone: Cobblestone

Iron: Ingots (armor), nuggets (tools/weapons)

Gold: Ingots (armor), nuggets (tools/weapons)

Diamond: Diamonds (I considered adding a nugget equivalent for diamonds as part of this but that might be too much)

Netherite: Netherite Scrap & Gold Ingots

Any other tool or item with durability uses the base resource.

The intent is to allow for a smaller-scale enchantment that doesn’t replace Mending, but does alleviate concerns regarding resource wastage or poor anvil habits. I think this is a good idea.