Are there forges in the gameworld fiction at all? If yes, then the players aren't adding forges, they're recalling the location of such a forge. The forge is either always there or not, it's not "added." You're stuck, as I surmised, in the idea that there is no forge, then the player makes they're move, and then there is a forge. You're stuck in thinking that this area has been gone over by the GM and no forge added, and now that choice is being overridden by the player to make the GM add a forge. This is incorrect -- there are forges, and perhaps one is nearby. The check is made to see if the player recalls a nearby forge, and, lo and behold, there is one! The difference here is that you're totally fine if the player asks the GM for permission to know this fact, and the GM can refuse, but if they choose to engage, then everything is hunky dory! The GM can instantiate a forge however the GM wants! It's not that the player creates forges, here, but that they dare have a say on the GM's turf! But, even this is wrong. There is no turf here, there is not establish "no forge" history. When the player makes the move, we all find out if the forge was there and what the PC recalls about that forge. There's no making the forge exist. It was always there, it's just now relevant to the game. This is what no myth play is about, and it's the hang-up point for people that are steeped in the consideration that the world exists in the GM's head and so a player asking about a forge that their PC recalls is intruding and forcing the GM to add it. It's not, the PC recalls the forge, and we're checking to see what it is they recall about it.