Constraints in category theory ???

Back to this quote from Douglas C. North:

When you structure the environment by rules, laws, and tools and techniques, the players are constrained in certain directions. It is the constraints on the actors that help the decision-maker.

How do you model a constraint? For example, the Ten Commandments is a set of constraints on human behavior:


What is it? A surjective functor? What would be a good forum to ask this question?

Rationality

Restricting the model from category A to category B simplifies choices because it requires only one type of rationality, i.e. function m: HxH -> H.