Give any AI employee a monthly credit budget of its own, in its panel (click its picture on Flows) or as the flow’s Monthly credit limit.
At 80% its owner and your admins are told, by a notice and an email. At 100% it pauses, so it never spends more than you allowed, and says why.
One click raises the budget and starts it working again: from the notice, the email, its card on Flows or its panel. Its card shows the month’s budget as a bar.