That sort of struck me with the linked story. They saw some wolf footprints, and then essentially summoned the monsters to fight by setting up an ambush in their current location.
I noticed they bought four horses without enough money to do so. (It correctly said two characters would have to borrow 20 gold each, but only 10 gold remained in the party, leaving them 30 short).
Yeah, there needs to be some interface where you the human can set certain values or a source of truth for both you and the AI to reference and possibly manipulate if the prompt requires it.
If you ask it to randomly pick a twist ending, a normal ending, a funny ending, or a scary ending, it would probably do it.