What an agency owes you.
A short, opinionated list of things you should expect from anyone managing your acquisition spend.
An agency owes you a clear answer to this question: which of last quarter's revenue would not have happened without us? If the answer is a hand-wave, a blended-ROAS chart, or a slide deck full of impressions — the agency does not actually know.
An agency owes you the right to be told no. If a campaign should not run, a budget should not be spent, an offer should not be tested — your agency should say so before you ask. The first time you hear pushback should not be the first time you raise a concern.
An agency owes you a plan to fire them. Not in cynicism, but in candor: the work is to graduate you to a place where you no longer need outside help in the way you do today. Most won't say this out loud. The good ones operate as if it were already true.