Below is a copy of the wiki on worth. It still states /worth toolbar when it is not a command anymore (line is in red) /worth or /worth <item> <amount> or /worth <hand/all> (Check how much the item in your hand is worth or an amount of a specific item is worth) ex: " /worth diamond 10 " Will show you how much 10 diamonds are worth even if you don't possess them. /worth all will give you the worth of all the items in your inventory. /worth toolbar|tb|hotbar|hb (Check how much the items in your toolbar are worth)
