In other words, are there places where a one liner for the agent would be more reliable than markdown instructions and crossing fingers?
I look at it this way... I wrote scripts over the years to make my life easier. Do the same for your agents and free their attention for the parts that matter.
Else if the agent creates a new script evry time the non-determinism rears its ugly head again.
But that means we need to know that the existing script is exactly what we want. And that means we need to understand the code, or at least the tested spec of the code, that AI writes for us. AI can't replace humans, humans must remain in control and understand what the code writent by AI exactly does.