MCRightClickItemEvent

The rightClickItem event is fired whenever the player right clicks with an item in their hand. It does not offer any special getters, but you can still access all members from MCPlayerInteractEvent

The event is cancelable.

If the event is canceled, Item#onItemRightClick will not be called

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

import crafttweaker.api.event.entity.player.interact.MCRightClickItemEvent;

MCRightClickItemEvent extends MCPlayerInteractEvent. That means all methods available in MCPlayerInteractEvent are also available in MCRightClickItemEvent