Categories

The auction house groups listings into categories, so a player after a sword is not scrolling past stacks of cobblestone.

Browsing by category

A category button in the /ah menu opens the category picker. Choose one and the grid filters to just those items. Choose again to come back to everything.

How items land in a category

Every listing is matched against your categories in order, and the first one that fits wins. That is why there is usually a catch-all category at the end, to hold anything the others did not claim.

Making them your own

Which categories exist, what each is called, its icon, and the rules that decide what lands in it, are all yours to change in categories.yml. Out of the box it ships with a sensible set: combat, armor, tools, resources, potions, enchanting, food, blocks, and an everything-else category.