Entity automation

entity.capability(host, &ENTITY_AUTOMATION, side) (NeoForge 26.3's Capabilities.Item.ENTITY_AUTOMATION, "automation-accessible inventory of an entity (boats, minecarts, etc)") is the items of an entity as a hopper reaches them, with the same Option<Direction> context as the energy and fluid keys. The game answers it for the container entities EntitySelector.CONTAINER_ENTITY_SELECTOR picks (chest and hopper minecarts, chest boats) with the slots their ENTITY_ITEMS handler has; a player and a chested donkey, mule or llama answer none. A hopper pushing into the entity in front of it asks for the side it faces the entity from (Up for a hopper over it), a hopper pulling from the entity above it for Down, and a dropper for the side it drops onto. Beside the game's container entities, those entities at the target whose mod provider answers it join the candidates, and the hopper picks one at random with the draw getEntityContainer makes; a mod handler takes the container's place and moves one item at a time in a transaction, as a mod block's ITEMS does. r.entity_capability(&ENTITY_AUTOMATION, "mymod:robot", |host, robot, side| …) registers one, and r.entity_capability_before_game answers ahead of the game's own for a minecart or a boat.