Is Fuel (Condition) — Skript
Addon: Skript · Category: Condition · Since: 2.5.1
Syntax
%itemtypes% (is|are) [furnace] fuelDescription
Checks whether an item can be used as fuel in a furnace.
Examples
on right click on furnace:
if player's tool is not fuel:
send "Please hold a valid fuel item in your hand"
cancel event