Hey there,
I'm unsure with the lore surrounding the enhancements, however I feel like they're sharing skills with one another rather than being more distinct.
Harper Agent is a high level generalist where as Inquisitive is a ranged combatant with some of the 'social' skills at play.
I'm writing this with the particular mindset of Harper Agent's improved deception and how it would work well with Inquisitive's Hit the Streets or Diplomatic immunity.
An Agent should be functionally invisible - thus the versatile adept passive.
An imbue which applies deception/sneak attack dice would lean into this cavalier yet suave combatant.
Improved feint would further facilitate this as a bluff to increase damage to foes.
Perhaps a trait - mastered feint: magical/mechanical/undead foes can now be bluffed
This combined with the the diplomacy stuff from inquisitive would give Harper a little more meat on the bone.
Diplomatic immunity being used in melee combat would be perfect too - as it's range and in turn potential damage from sneak attack/bluffing or diplomacy would make sense.
Perhaps choice of Int/Wis/Cha to boost appropriate innate skill if it doesn't already?
But what about Inquisitive?
If Harper will be getting the social ques from inquisitive - what will it gain?
More crossbow stuff.
Perhaps I'm a little in the mindset of Diablo and the demon hunter; but a few new skills for using a single or duel hand crossbow style could certainly be a bit more fun.
Leaning more into the hunter in the dark and culling the demon/werewolf
Eg.
Back shot - leap back into the air with a flurry of bolts; a FvS leap of faith with a hail of crossbow bolts to boot.
Tunnel vision - shoot dozens of bolts in a line breaking fortification over time
Pirouette - consume a stack of returning bolts to surround yourself in a flurry of bolts for X seconds.
I know that these might be either a little outlandish or perhaps work well in game if done appropriately,
Just some thoughts on how to make both enhancement trees feel a little more meaty and lean into the archetypes more
Thank you for reading