Trade Selector is a client-side Fabric mod for Minecraft 1.21.x that automates librarian enchanted-book rerolling.
What it does;
- Bind a librarian and its lectern
- Choose a target enchantment, level rule, and max price
- Start automation and let the mod reroll trades until it finds a match
- Stop automatically when a matching trade is found
Features;
- Automated librarian reroll loop
- Enchantment targeting
- Level matching modes: Any, Exact, Range
- Max emerald price filter
- Configurable success sound
- Optional lectern recovery movement
- Safety checks for manual movement/focus changes
- Works even when Minecraft is not the focused window
Important behavior;
Lectern breaking does not auto-select tools.
The mod breaks lecterns using your currently selected hotbar item. If you want faster breaking, keep your preferred tool selected before starting.
Keybinds;
- K — Open Trade Selector GUI
- V — Bind librarian
- B — Bind lectern
- N — Toggle automation
Disclaimer!
Use at your own risk. You are responsible for following server rules. I am not responsible for bans, suspensions, or other account penalties resulting from use of this mod.

