Okay. We are starting from the assumption that the character has been defined through a knowledge of a specific genre. let's say that the character is a heroic adventurer in a fantasy milieu. Let's also assume, since this is the supposition, that the GM knows the rules and isn't just making up everything by fiat.
The PC outside a secure manor and wants to scale a wall to get inside. The GM describes the difficulty of scaling in the fiction. "The wall is well constructed to prevent infiltration, with a smooth surface and few handholds" or "The wall is old and much of the palster has crumbled, as well as ivy growing up it that might provide handholds." In either case, the player has a in fiction piece of information that they con combine with their foundational information about their competence, and can thus make an informed decision about whether to attempt the climb in the fiction.