With the exception of reaction rolls, there are no rules for social interaction. Lies, bartering, intimidation, diplomacy, and romance are matters left to your wit and to the Bookkeeper’s knowledge of NPCs’ wants and motivations.
For the Bookkeeper, there do exist some soft social guidelines to enhance the flavor of your game. Keep in mind that:
people can hear you
Whatever’s said between the players can be heard by nearby NPCs—within reason. If Hobart the Idler’s player says “I really need to rebuy A deal with death after that gunshot wound, but it’s so expensive,” no one will hear, but if Hobart’s player turns to the player portraying Ken Sembling of Leeward and says “I think we’re going to have to kill this guy,” in front of the guy they intend to kill, the NPC is well aware and will act accordingly.
people are accepting
The people of the Coast are largely accustomed to unusual things and people. They live in strange times, and are normatively flexible and largely accepting of difference. Cutters’ wild ideas, behaviors, or requests won’t be met with automatic disgust, fear, or opposition unless the cutters earned a truly negative reaction.
Most people of the Coast are entirely normal. They don’t understand the world as cutters, magicians, or scholars do, and will contextualize fringe behaviors and facts with comfortable common sense or folklore long before internalizing disturbing truths.
What this entails for gameplay is simple: People won’t shut down conversation just because you’re weird.
people can tell what you are
Cutters are obvious. No one in their right mind looks the way you do. Every ounce of cutter-ness belies your nature: Wearing weapons or armor, especially archaic designs. Wearing backpacks all the time. Wandering around bedecked in strange gear. Carrying anachronistic baubles and bags upon bags of money, especially. There’s no mistaking a cutter with anything else, even a soldier: Soldiers wear regular, matching uniforms and gear issued by recent government manufacturers.
Unless you intentionally disguise yourself—forgoing or concealing all your oddments and equipment and cleaning up properly with the barbering skill—you’ll always be pegged as a cutter.