Reads each librarian's trades and writes them on its lectern, so you can reroll for Mending without opening a single trade screen. Mark the books you're hunting and they show up in green.
Paste, import or screenshot a build's material list and get a live checklist on your HUD. Track the shulkers you're filling, and light up nearby chests holding what's still missing.
Play Connect Four against villagers! A button on the trade screen starts a full game - their skill scales with trading level, and because the villager drops first, a Master has solved the game and cannot be beaten.
Play chess against villagers! A Play Chess button on the trade screen starts a full game - their skill scales with trading level, from Novice pushover to near-unbeatable Master.