For between PCs I think it's the purview of the individual character players to decide whether it's Manipulation or not, like:
Nicodemus: "Hey, I want you to work for me."
Gadget: "Okay, well--"
Then, option 1:
N and G negotiate a deal. No rolls intervene.
Option 2:
N: Hold on, I want to roll Manipulate.
G: Really, dude? Okay.
Option 3:
G: Okay, well, roll Manipulate if you really want it, bc Gadget isn't going for it right now.
Similarly for the PC-NPC case. I think you'll find that nearly all moves in AW can be negotiated this way---
N: Hey, what's actually on Gadget's mind? She's acting weird.
1: G: "There's something I've been wanting to talk to you about, Nicodemus. There's something wrong with our water supply. It tastes like blood, man."
2: G: Roll to read a person, dude, 'cause Gadget isn't talking.
3: N: I'm going to roll to read her.