Auto Kill

Auto Kill kills the mobs you list and gives the farmer their drops. It turns an animal pen into a production line, and it is the module most likely to need limiting.

auto-kill:
  name: "Automatic Kill"
  status: true
  default-status: false
  permission-required: true
  only-kill-spawner-mobs: false
  mobs:
    - SHEEP
    - COW
    - IRON_GOLEM

Which mobs

mobs is the whole list. Anything not in it is safe from the farmer no matter what a player does, which makes this the one setting to get right before opening the module to players. Adding IRON_GOLEM — as the default does — means iron farms work; adding a hostile mob means the farmer does the fighting.

Players can narrow the list further in their own auto-kill settings menu, but never widen it.

Spawner mobs only

only-kill-spawner-mobs sets the server default and AUTO_KILL_SPAWNER is the per-farmer version of the same switch, which players toggle themselves. With it on, mobs that were bred or that spawned naturally are left alone and only spawner output is killed.

This is how you separate two economies: spawners feed the farmer, breeding does not.

Modifying the settings

Changing auto-kill settings needs uxmfarmer.autokill.modify in addition to uxmfarmer.autokill. Splitting them lets you give a rank the module while keeping its mob list fixed at whatever you set.

Player drops

Drops from mobs a player killed are governed separately by collect-player-drops:

collect-player-dropped-items: true
collect-player-dropped-items-by-default: true

and the owner permission uxmfarmer.collectplayerdrops. Leave this on and a player fighting in their own base feeds their farmer; turn it off and only the farmer's own kills count.