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The /give and /replaceitem commands are fine if I want to create a new item with a custom attribute, but is there a command to add an attribute to an existing item?

The closest I've gotten to this is adding attributes to an entity representing a dropped item, but the attributes do not carry over to the item once picked up:

/entitydata @e[type=Item,r=1] {AttributeModifiers:[{...}]}

Thanks in advance!

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Yup! What you're doing works just fine, with some minor tweaks.

To apply the attribute modifier to the item, you need to do this instead:

/entitydata @e[type=Item,r=1] {Item:{tag:{AttributeModifiers:[{<attribute stuffs>}]}}}
  • Have you tested this? Because I don't think it'll work. – MBraedley Mar 5 '16 at 22:37
  • @MBraedley I have tested this. I can put up a gif, if you want. – Addison Crump Mar 5 '16 at 23:42
  • That was me telling you that your command is wrong. You're missing a pair of braces. – MBraedley Mar 5 '16 at 23:48
  • Oh, heh, I copied it over wrong. Whoops. Thanks, @MBraedley. ;P – Addison Crump Mar 5 '16 at 23:49
  • That did it! Thanks. Still getting the hang of this stuff. – blahpers Mar 6 '16 at 5:59
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Here is the updated command syntax for 1.13+:

/data merge entity @e[type=item,distance=..5,limit=1] {Item:{tag:{AttributeModifiers:[{<attribute stuff>}]}}}

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