For $skill[CHEAT CODE: Invisible Avatar] and $skill[CHEAT CODE: Triple Size], Mafia will not cast multiples. Skill will only be cast once:
> cast 3 CHEAT CODE: Triple Size
You acquire an effect: Triple-Sized (20)
CHEAT CODE: Triple Size was successfully cast.
> ash use_skill(3,$skill[CHEAT CODE: Triple Size]);
You acquire an effect: Triple-Sized (20)
CHEAT CODE: Triple Size was successfully cast.
Returned: true
> cast 3 CHEAT CODE: Triple Size
You acquire an effect: Triple-Sized (20)
CHEAT CODE: Triple Size was successfully cast.
> ash use_skill(3,$skill[CHEAT CODE: Triple Size]);
You acquire an effect: Triple-Sized (20)
CHEAT CODE: Triple Size was successfully cast.
Returned: true