This mod currently adds the ability to determine the Entity an IF Mob Imprisonment Tool holds by adding one entry to the data returned by, e.g. getStackInSlot(). This entry is called 'entity', and contains either the Resource Location (e.g. "minecraft:pig" for a Pig), or 'NONE' if the MIT is empty.
I may add more features later. No promises on that, though.
Project members
BrisingrAerowing