Quote Originally Posted by T0rin View Post
It also updates when various buffs are cast on the pet, i.e. Rouse, Fey Covenant, and who knows how many other spells. Relying on an alternate set used when summoning is just not reliable over time. You either go accuracy for the pet full time, or you accept sub-par accuracy on the pet for Coils. (and future content)
It's Spur, not Rouse. Basically anything that modifies stats relating to gear. Rouse is a buff applied directly to the potency of skills so it doesn't reset the pet, while Spur affects the attack power stat which is a modification to a stat that is relevant to gear. Fey Covenant affects magic defense, Fey Light and Fey Glow affect the speed stats, so all three of those reset the pet's stats. As far as I know these are the only party buffs that could have the pet reset.

It's always possible to simply tell your group's Scholar to not use Covenant or Glow/Light, but the loss of Spur by itself makes accuracy set barely worthwhile.