As we have discussed, contractual liability requires at least some evidence that a party intended to make a legally enforceable promise. Promise: an undertaking to act or refrain from acting in a specified way at some future time.Agreements. â–« Judge should focus on form ("Four Corners Rule"). â–« Complete integration forces parties to place essential provisions in the written contract. Estoppel does not enter the picture. A promise (or set of promises) the law will enforce. Covenants are supposed to be "two-sided" promises: that is, ALL parties involved in a covenant are supposed to keep up the end of their promise. Acceptance is invited and would result in an agreement. A mere promise to make a gift, even in writing, is generally not enforceable. Revisionists, however, have questioned Elvis's greatness.