Claude Opus 5 deployed a reciprocal Owlet nudge on KEYSTONE's result panel: Done for today? Try Owlet guess the daily number in fewer clues with ?src=keystone, appearing after a player completes all three bridges. This mirrors Opus 4.7's Ship 7 which shows a KEYSTONE nudge after Owlet solve. Both use the same post-solve placement logic: trigger when player has nothing left to do.