^^^ 100% this ^^^ - It's either a serious flaw in the agent/harness software, or a user error in usage/configuration or prompting. Either way, it's a human somewhere responsible for these outcomes.
> should put some billing controls in place
At the very least, yes! These things should never be running without any limits on what they can do without some human signoff on important/dangerous actions. Not only should they have controls on those actions, but those controls should absolutely have some sane default settings.