Handheld 3D objects are custom models used as items in the player's hand. They are suited to weapons, tools, wands, instruments, gadgets, and other equipment that needs more shape than a flat item texture.
You can also upload a saved Blockbench project and explain that it should be used as a handheld item.
The 3D model controls how the object looks. The mod prompt controls what the item does.
For example:
Use
@storm_hammeras a handheld weapon. It deals heavy damage and calls a lightning strike where the player is looking when used, with a ten-second cooldown.
Describe:
View the item in first person, third person, and the inventory. Check the grip, scale, direction, and any animation or ability. If the model points the wrong way, adjust its Studio orientation or request a precise correction with a Mod Edit.