/picker

• /picker [<category>]

  Opens the item picker, which lists the items behind the selected categories; category is a category ID such as mxt:aura, mxt:artifact, mxt:currency, mxt:item_binding or mxt:technique, and leaving it out walks every registered category. It needs the gamemaster permission and only works in creative mode.

What each category lists

/picker comes from the Picker mod - this mod bundles it through jarJar, so installing this mod is enough. What the screen looks like, how the search matches and how an item leaves it are that mod's business; what follows is only what each category lists.

The category argument is the ID of one datapack registry: tables that claim items (item_aura, item_binding, default_quality and so on through items, currency through item) are expanded into the items they claim, while block_aura and heat_source claim blocks with blocks and give one row per block, and spirit_herb expands into its fruit (growth.drops), one row per fruit item - the stack a tooltip and a furnace actually ask about, with a herb that writes no growth falling back to the item form of the blocks it claims. The registered categories are, in order (the first two are the Picker's own built-ins):

minecraft:item, minecraft:block, mxt:item_aura, mxt:currency, mxt:spirit_herb, mxt:pill_binding, mxt:artifact, mxt:item_binding, mxt:weapon_binding, mxt:tool_binding, mxt:blueprint_binding, mxt:default_quality, mxt:block_aura, mxt:heat_source, mxt:pill, mxt:contract_type, mxt:secret_realm, mxt:formation, mxt:talisman, mxt:technique, mxt:alchemy_furnace, mxt:alchemy_wall_material, mxt:aura, mxt:spirit_root, mxt:physique, mxt:quality.

Note that mxt:technique is a category but mxt:technique_binding is not: a technique is what gets a row, and the row is the carrier stack the mod generates for it (the item the technique's declaration names as its carrier_item, or the technique book), already carrying its mxt:technique component. See Technique Binding.