I was under the impression that "agreed upon" for international diplomacy was regularly used before ratification by any national government or parliament, because that is usually the required first step. It might still fail later on before becoming law.

I think it is the same for national things as well, e.g., two government parties in a coalition "agreeing" to make a law, even though it was an out-of-parliament discussion and has not been voted on in parliament and might never make it that far.