AbdulAlhazred
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Nope. There are 2 possible situations here:It isn't? Those examples of player action declarations causing dwarven forges and hunter lodges to appear certainly could have fooled me!
1) the player answered a GM question (in character, as required). No mechanics are employed here, and the initiating activity is the GM asking the question.
2) the player invoked a move, such as Discern Realities or Spout Lore, which requires the GM to make some sort of declaration (though its exact nature and content is never mandated).
That is it. A player might, obviously, make an informal observation about what he thinks would be cool to have appear also, unsolicited. This is just 'table talk' and isn't a formal part of an RPG. In fact it is a bit discouraged by PbtA as 'play time' is supposed to remain in character as much as possible.