[Gryphin]

I like it.
Between humans it would have to be the Honor system. If your opponent is Role Playing a less than honrable race it could get sticky.
I think the terms might include:
Withdraw X ships from specified systems

I would hope the AI could be modded as to how they would react.
Probablilty to Abuse := XY
Abuse Cease Fire := Sending in More Ships
Abuse Cease Fire := Deploying Mines
Abuse Cease Fire := ....