The hooks are named after the method which they are patched into, and here's the initial list: -
Actor5e.rollAbilitySave
Actor5e.rollAbilitySave
-
Actor5e.rollAbilityTest
Actor5e.rollAbilityTest
-
Actor5e.rollDeathSave
Actor5e.rollDeathSave
-
Actor5e.rollSkill
Actor5e.rollSkill
-
Item5e.roll
Item5e.roll
-
Item5e.rollAttack
Item5e.rollAttack
-
Item5e.rollDamage
Item5e.rollDamage
-
Item5e.rollFormula
Item5e.rollFormula
-
Item5e.rollRecharge
Item5e.rollRecharge
-
Item5e.rollToolCheck
Item5e.rollToolCheck
I intend to be releasing some small modules coming up which leverage these hooks to do very specific things with the item usage workflow. It's my hope that in time whichever hooks of these prove useful will be added to the core system itself.