Hey, have you read this? If not, you should!
It’s a great post by John Harper about “The Line” between details the GM is responsible for and details the player is responsible for, and how that affects both the questions you ask as a GM and the options you build into custom moves. Really smart stuff that’s heavily influenced how I play DW and how I write moves.
It’s about Apocalypse World rather than Dungeon World, but I’d say everything in it applies equally to both. You can even see Sage LaTorra in the comments asking about earlier versions of the Undertake a Perilous Journey move!