Item attributes

[Cat Cake]

So im using 1.9.4 spigot for the version and im trying how to modify the item attributes like the armor points or weapon damage with skript. I did a bunch or research but came up with very little. This is that I have so far

on click:
    if name of the player's tool is "&6Blade of the Devs":
        add "{AttributeModifiers:[{AttributeName:""generic.attackDamage"",Name:""generic.attackDamage"",Amount:100,Operation:0,UUIDLeast:324464,UUIDMost:154531,Slot:""mainhand""}" to nbt of player's tool

It doesnt give an error but just doesnt work, how could I do this? (Im using skstuff)
[doublepost=1598047732,1598046820][/doublepost]Bump

 

[Chriz]

I don't know how to fix this but if you give the player an effect (like strength or resistance) for a few ticks and do it with no particles it should work the same way.