So, how do you handle social checks made against players by NPCs?
I find this a difficult concept, especially in the format I usually play games in: detailed and RP-heavy play-by-posts. In my head, a player's impression of an NPC - and, by extension, they character's - should be formed by interpreting that NPC's words and actions. This lets players feel engaged and in control of how they view the world you're presenting them. Plus, I feel like a successful check by an NPC might remove agency in some way.
Worst case - and I understand this is bad GMing - I could see, for example, this result to a successful Charm check:
"You like this guy."
"What? No, I don't even trust him. I think he's lying, and probably evil."
"No, you trust him. You like the guy."
On the other hand, I can see a player who isn't very good at reading people or analyzing behavior playing a character who is . They might not see through the deception, or feel like the character seems just a bit too friendly, but that doesn't meant their character shouldn't. Still, that situation only really applies to lies told by an NPC, and there are other problems with Deception rolls against players. At what point is your NPC required to roll Deception?
This is an especially poignant question for me. I'm prepping to GM Onslaught at Arda I, and I don't feel it's a spoiler to say the adventure involves a traitor. It's sort of int he product description. Does the traitor roll Deception just trying to be normal around the PCs? If he is in a situation where he has to react to the possibility of a traitor, is there a danger he's outed in Act I by failing to seem surprised when he says "Oh, man, there might be a mole? That's worrying."
What if the PCs decide to interrogate everyone, and pointedly ask them: "Are you a traitor?"
These aren't questions I can really find answers to on my own. I mean, I could see it happening in some sort of "social combat" encounter, like a setpiece negotiation. Such a thing might take place in structured time: you use "negotiate" to further your point, moving the meeting forward a step, but your target uses Coercion - now you're worried about pressing them too far, and suffer setback to your next social check as you try carefully not to anger your "opponent". That sort of thing. For everyday use, I'm baffled...