How to give tags based on offhand items? Minecraft Java

Question

I want to make it so if you are holding a book if your offhand, you will receive a tag, but if the book is not in your offhand, you dont have the tag anymore, how do I do this with command blocks?

ExpertCoder14 · Accepted Answer

To apply the tag when the player is holding a book, it's easy:
tag @e[nbt={Inventory:[{Slot:-106b,id:"minecraft:book"}]}] add testTag

To remove it when the player is not holding a book, use the /execute command to tell each player to check their NBT for a book in their offhand, and remove the tag if it is not found.
execute as @a unless entity @s[nbt={Inventory:[{Slot:-106b,id:"minecraft:book"}]}] run tag @s remove testTag

How to give tags based on offhand items? Minecraft Java

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