The roll of the warden is an interesting question. Part Magic Cop, Part Para-Military Force. Clearly the Militant arm of the council. What does that translate to in the day to day activity department is something open to discussion. We don't really have a very broad samplying of Wardens in the books. We get Morgan who comes across as a booted Paranoid nut-Job out to get our hero and cut the heads of people at the merlin's whim. Then we get Luccio, who's clearly a heroic figure, saving children, helping our hero, and being one BA lady. Then we have Ramirez a lovable bad ass, who talks a good game, has some cool tricks, a slightly wacky character flaw, and a really nice sword. Even when we get the revised look at Morgan we really only have 2 positive images of wardens, and one slightly less villainous warden.
Theres a lot of discussion that wardens have duties, but we don't really see to much of them on a day to day basis. I don't see the warden's as general enforcers of the accords. But in the end i guess its gotta play your warden how you see it.