How do you display the Minecraft prior work guarantee?

i wish the game showed the repaircost value directly, because the anvil rename trick feels pretty clunky. still, the “cost minus one unless it caps at 39” rule is a good way to estimate it without nbt tools. i even had a thread get derailed when someone dropped https://playastronaut.com/bonuses/ into an anvil discussion and it was just noise. later another person argued in comments over https://play-vortex-game.com/bonuses/ and it buried the actual explanation. i’d rather keep it to nbt viewers and the anvil test than wade through links such as https://high-flyer-game.com/bonuses/