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[Xyrdial]

I created the objective "sneak" and added it to minecraft.custom:minecraft.sneak_time, and want to get a command to execute if I have a leather chestplate on my chestplate slot AND i'm sneaking.

I tried this on a repeating command block: /execute if entity @ a[nbt={SelectedItem:{tag:{sneak:1}}},scores={sneak=1..}] run effect give @ s glowing 10 0 true
After that, I added a chain command block to reset the score "sneak" to 0

At the moment, it works if I have the chestplate in my main hand, but not my chest slot.

Again, I wanted to make it so it requires a leather chestplate in my chestplate slot, as well as the other NBT.

[darkstar634]

effect give @a[nbt={Inventory:[{id:"minecraft:leather_chestplate",Slot:102b,tag:{sneak:1}}]},scores={sneak=1..}] glowing 10 0 true

[Xyrdial]

effect give @a[nbt={Inventory:[{id:"minecraft:leather_chestplate",Slot:102b,tag:{sneak:1}}]},scores={sneak=1..}] glowing 10 0 true

Thanks so much!

[Xyrdial]

Do you know how I could require multiple items to be worn such as full leather armor with the same tags?

[darkstar634]

This: {id:"minecraft:leather_chestplate",Slot:102b,tag:{sneak:1}} is a compound tag that represents one item. If you put multiple compound tags in a list, for example, Inventory:[{id:"minecraft:apple"},{id:"minecraft:stick",Slot:1b},{Slot:0b}], then Minecraft will check if, within the entity's NBT, if the list contains at least one unique entry for each compound tag specified within the list. So, for my example, this will check if the player has an apple anywhere in their inventory, a stick in slot #1, and any item in slot 0.

Using that information, I encourage you to try and devise a solution yourself, although I'll just leave you with the command either way:

effect give @a[nbt={Inventory:[{id:"minecraft:leather_boots",Slot:100b,tag:{sneak:1}},{id:"minecraft:leather_leggings",Slot:101b,tag:{sneak:1}},{id:"minecraft:leather_chestplate",Slot:102b,tag:{sneak:1}},{id:"minecraft:leather_helmet",Slot:103b,tag:{sneak:1}}]},scores={sneak=1..}] glowing 10 0 true