Arts Stealth (XC1)

Arts Stealth is a gem effect in Xenoblade Chronicles and Future Connected. It reduces the amount of temporary generated by using arts. Permanent aggro generated by the or  done by the art is not affected.

Overview
Arts Stealth is kind of situational. Its effectiveness depends on the combination of "how much damage/healing will this art do" versus "how much temporary aggro does this art generate". For example, only does damage with no arts aggro, so Arts Stealth does not help it at all, whereas Drive Boost has high arts aggro without doing damage or healing, so Arts Stealth will work very well on it.