Problems with executing a command for an item with custom data

Question

I have the following command:

execute as @a
[nbt={SelectedItem:{id:"minecraft:snowball",components:{"minecraft:custom_data":{inv:1b}}}}] 
at @s run effect give @s minecraft:invisibility 1 0 true

It checks if the player has an item with specific custom data in their main hand. But I need to check if the item is in their secondary hand (or in any other slot), and unfortunately, my knowledge of command blocks in Minecraft version 1.21.10 does not allow me to understand why this command doesn't work.

I tried using Inventory slots and Items instead of SelectedItem, but my attempts were unsuccessful.

NODO55 · Accepted Answer · 2026-02-27 14:58:37Z

First, you can target the offhand slot by looking at equipment.offhand. It would look like this in your selector:

nbt={equipment:{offhand:{id:"minecraft:snowball",components:{"minecraft:custom_data":{inv:1b}}}}}}

Still, I recommend using a different argument of the execute command that's faster and more readable, which has the added bonus of being capable of checking multiple slots in the same command: execute if items. Your command would look like this:

execute as @a if items entity @a weapon.* snowball[custom_data={inv:1b}] run effect give @s invisibility 1 0 true

(I also removed the at @s since you don't need positioning)

There are similar arguments to weapon.* targeting any slot in the hotbar (hotbar.*) or in the entire inventory (inventory.*), and so on. You can also target specific slots like weapon.mainhand,weapon.offhand, etc.

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