The phrase "to enforce the agreement" means to make sure that the terms and conditions of the agreement are followed and that any actions or promises specified in the agreement are carried out. Full definition
This is the only way to legally enforce the Agreement if you or your spouse violates the terms. (divorceattorneynyc.com)
Contracts are written on the assumption that the courts are available to help parties enforce their agreements. (rethinking.legal)
In addition, it may appear that enforcing the agreement seems to lean more towards punishing the past employee than protecting business interests. (rocketlawyer.com)