No agent can see me in sneak without him being OSB. Go ask them.
Sneaking and stuff not being my point tho. The point is, playing an agent needs more skill.
Just a little paractice and it's possible to gank an agent faster then he gets you, having MoR up helps a lot. I admit I never managed to gank, for instance, Ripline, he's way too good for such tactics. But again, I'm still pretty gimpy atm.