I've seen a few quotes saying that the accords are enforced by the offended party...
Which is a little like saying that if North Korea invades South Korea, the UN will tell South Korea to defend themselves.
The accords are defended by ALL parties, not just the offended one, or they're worthless.
Mab in particular is the biggest threat, since she wrote them. That said, if you're part of a signing party, does that mean you are, by inclusion, part of a binding contract with Mab?
Cause... then enforcement becomes a bit... more. More severe, more terrifying, more swift, more... everything.