Model providers are used to dynamically change the model of items based on data from ItemStacks. A common example is the bow, which has different textures based on how long the bow has been pulled. All providers are then used in the model file for the item, in the overrides section.

For this example, let's say we have we have a custom bow item called EXAMPLE_BOW.

FabricModelPredicateProviderRegistry.register(EXAMPLE_BOW, new Identifier("pull"), (itemStack, clientWorld, livingEntity) -> {
	if (livingEntity == null) {
		return 0.0F;
	}
	return livingEntity.getActiveItem() != itemStack ? 0.0F : (itemStack.getMaxUseTime() - livingEntity.getItemUseTimeLeft()) / 20.0F;
});
 
FabricModelPredicateProviderRegistry.register(EXAMPLE_BOW, new Identifier("pulling"), (itemStack, clientWorld, livingEntity) -> {
	if (livingEntity == null) {
		return 0.0F;
	}
	return livingEntity.isUsingItem() && livingEntity.getActiveItem() == itemStack ? 1.0F : 0.0F;
});