Blue
Ravenous Bugblatter Beast of Traal
A missed Spout Lore roll is not just that there is no information, there are also consequences to it. All missed rolls in PbtA games worsen the position of the characters by triggering a GM move.For myself:
A sapling is a small thing, its presence or absence having little effect other than making this one roll work this one time. I don't know if there is a mechanical difference, since (properly speaking) the "luck roll" is a generic mechanic and the Spout Lore is not. It's also diegetic, in the sense that your luck happened to not fail you this time--but it would have been Especially Bad if your luck had failed you.
Not quite. The Spout Lore mechanics the player used require the DM to describe a positive result, exactly in the Luck example. In this thread they have been calling that player authorship, since it's the player's success on their Move that required this, and the player's focus (What do I know about dwarven forges in these mountains / food, warmth, shelter in the tundra) that directs the subject.Food, water, and shelter is more of a challenge, but not much. One example, you run into someone who happens to be out there (such things happen), perhaps a trapper or the like, who is of a favorable disposition and shares supplies with you. That seems diegetic to me, you literally lucked into finding help.
As I had understood it, it wasn't the DM authoring the Forge, because the whole point was player authorship.
However, the facts provided by the Spout Lore are from the DM, be it existing information or made up in the moment.
Because they got the best result, the information the GM was providing needed to be both Interesting and Useful. On the lower level of success, it is not required to be immediately useful.

Spout Lore
When you consult your accumulated knowledge about something, roll+Int. On a 10+, the GM will tell you something interesting and useful about the subject relevant to your situation. On a 7–9, the GM will only tell you something interesting—it’s on you to make it useful. The GM might ask you “How...