Entities & Players

The OOP module models Minecraft entities and players as Kotlin objects with selectors and context-aware extension functions.

Creating entities

val player = player("Steve") {
	gamemode = Gamemode.SURVIVAL
	team = "red"
}

val arenaMobs = entity("ArenaMob", limitToOne = false) {
	tag = "arena"
}

val zombie = entity {
	type = EntityTypes.ZOMBIE
}

player() creates a Player instance (subclass of Entity) with type = minecraft:player, limit = 1, and the given name. entity() creates a generic Entity with custom selector arguments, and can also start from a named entity selector when you already know the exact entity name to target.

Use player(...) when you want a selector already scoped to players, and entity { ... } when you need a reusable selector for mobs, armor stands, projectiles, or a more generic execute target. Use entity("Name", ...) when you want the same convenience as player("Name") without forcing the selector to minecraft:player.

Creating entities from an EntityType

You can also construct an Entity handle directly from an EntityTypes value using toEntity() or the typed overload of entity():

// extension on EntityTypeArgument, the selector type is set for you
val creeper = EntityTypes.CREEPER.toEntity()
val skeletons = EntityTypes.SKELETON.toEntity(limitToOne = false) { team = "arena" }

// same result, written like the other entity(...) overloads
val spider = entity(EntityTypes.SPIDER)
val endermen = entity(EntityTypes.ENDERMAN, limitToOne = false) { tag = "target" }

Both forms set selector.type automatically so you never need to write type = EntityTypes.X by hand. Use toEntity() when calling from an EntityTypeArgument receiver; use entity(type, ...) when you want a form that reads like the other entity(...) overloads.

Handles for spawned displays and mannequins

Four Entity subclasses target one specific spawned entity by UUID rather than by selector filters: BlockDisplayEntity, ItemDisplayEntity, TextDisplayEntity, and MannequinEntity. Each pins selector.type and a UUID NBT filter, so it always resolves to exactly that entity.

You do not construct them directly in normal use - the helpers module returns them when it spawns something. DisplayEntityInterpolable.toEntity() picks the matching display subclass, and Mannequin.summon(position) returns a MannequinEntity:

function("spawn_display") {
	val display = blockDisplay {
		blockState(Blocks.DIAMOND_BLOCK)
	}.interpolable(vec3(0, 64, 0))

	display.summon()
	display.toEntity().addTag("arena_decor")

	val statue = mannequin { pose = MannequinPose.STANDING }.summon(vec3(0, 64, 0))
	statue.swing(SwingHand.MAINHAND)
}

Both spawn calls embed a UUID in the summon NBT, which is what the returned handle filters on - so the handle resolves to that one instance even if several are spawned. The UUID comes from DataPack.entityUUID(), a hash of the pack name, the entity and its position, so it stays the same across builds and differs between two identical entities. Once you hold one it behaves like any other Entity: every extension on this page applies.

kill @e[limit=1,nbt={UUID:[I;...]},type=minecraft:block_display]

See Display Entities and Mannequins for building and spawning them.

Reading and reshaping a handle

An Entity is a thin wrapper around SelectorArguments, exposed through these members:

asSelector() is the escape hatch: every OOP command ultimately calls it, and you can call it yourself to drop back into the core command DSL at any point.

function("inspect") {
	val mobs = entity(EntityTypes.ZOMBIE, limitToOne = false) { tag = "arena" }

	kill(mobs.asSelector(limitToOne = false) { tag = "marked" })
}

toEntity<T>() and toEntityOrNull<T>() narrow a generic Entity to a subtype such as Player - the first throws when the conversion is impossible, the second returns null.

Targeting @s

Entity always renders as @e[...], because asSelector() builds an allEntities selector from the stored SelectorArguments. There is no Entity handle that renders as @s, and self() returns a SelectorArgument, not an Entity, so it cannot be passed to Entity-only helpers such as getScoreEntity, batch, or executeAs.

When the executing entity is already @s - inside an execute as block, an event handler, or a batch body - use the core command DSL with self() instead of trying to wrap it in an Entity:

function("charge_up") {
	val lastCharge = scoreboard.objective(self(), "last_crystal_charge")
	lastCharge += 10
}

scoreboard.objective(selector, objective) returns a PlayerObjective supporting the same operations as ScoreboardEntity (set, add, remove, reset, +=, -=, min, max, operation), so nothing is lost by dropping the OOP wrapper here. See Scoreboards → Raw selectors and @s.

The same applies to every other command: pass self() directly to kill(...), tellraw(...), give(...) and friends rather than looking for an Entity equivalent.

Execute helpers

Entity-scoped execute shortcuts emit /execute as, /execute at, or both:

function("teleport_self") {
	player.executeAs {
		run { it.teleportTo(it) }
	}

	player.executeAt {
		run { it.giveItem(Items.DIAMOND) }
	}

	player.executeAsAt {
		run { it.sendMessage("Hello from my location!") }
	}
}

These helpers are especially valuable when you would otherwise repeat the same execute as, execute at, or execute as ... at ... boilerplate around several commands.

Batch

batch() creates a named sub-function that groups multiple commands under a single entity context:

function("setup") {
	player.batch("init_player") {
		give(self(), Items.DIAMOND)
		effect(self()) { give(Effects.SPEED, duration = 200) }
		tellraw(self(), "Welcome!")
	}
}

The block receives a plain Function run as the entity, so it targets that entity with self(): the Entity extensions like giveItem need an entity receiver and aren't in scope there.

batch() is a good fit for onboarding flows, class kits, respawn setup, or any repeated multi-command routine that should stay grouped under one entity context.

Entity Commands

Extension functions on Entity for common Minecraft commands:

function("commands_demo") {
	player.kill()
	player.damage(5f)
	player.addTag("vip")
	player.removeTag("vip")
	player.giveXp(10.levels)
	player.setXp(0.points)
	player.setGamemode(Gamemode.CREATIVE)
	player.sendMessage("Hello!")
	player.showTitle(textComponent("Title"), textComponent("Subtitle"))
	player.showActionBar(textComponent("Action bar text"))
	player.playSound(SoundEvents.Entity.ExperienceOrb.PICKUP)
	player.mount(zombie)
	player.dismount()
	player.clearItems()
	player.giveItem(Items.DIAMOND)
	player.replaceItem(WEAPON.MAINHAND, itemStack(Items.NETHERITE_SWORD))
}

Scores, teams, and counts

These extensions bridge an Entity handle to the other OOP systems:

function("bridge_demo") {
	val kills = player.getScoreEntity("kills")   // -> ScoreboardEntity
	player.setScore("kills", 0)                  // one-shot write, no handle

	player.joinTeam("red")                       // by name, or joinTeam(redTeam)
	player.leaveAnyTeam()

	// counts how many entities match right now, then writes that number to a score or NBT path
	val mobs = entity(EntityTypes.ZOMBIE, limitToOne = false)
	mobs.storeCountIn(kills)
	mobs.storeCountIn(player, "kore.mob_count")
	mobs.storeCountIn(storage("stats", "kore"), "mob_count")
}

Entity Effects

Extension functions on Entity for giving, clearing, and managing mob effects:

function("buff_player") {
	player.giveEffect(Effects.SPEED, duration = 200, amplifier = 1)
	player.giveInfiniteEffect(Effects.NIGHT_VISION, hideParticles = true)
	player.clearEffect(Effects.SPEED)
	player.clearAllEffects()
}

Putting it together

dataPack("arena") {
	val player = player("Steve")
	val mobs = entity(EntityTypes.ZOMBIE, limitToOne = false) { tag = "arena" }

	function("round_start") {
		player.joinTeam("red")

		player.batch("round_start_player") {
			give(self(), Items.DIAMOND)
			effect(self()) { give(Effects.SPEED, duration = 200) }
			title(self(), TitleLocation.ACTIONBAR, textComponent("Fight!"))
		}

		mobs.storeCountIn(player.getScoreEntity("mobs_left"))
	}
}

One reusable handle per gameplay concept, declared once at datapack level, then used across as many functions as needed - that is the core value of the OOP entity API.

See also

• Items - Reuse item stacks with giveItem, replaceItem, or summon-based reward flows.
• Events - Attach gameplay reactions directly to the entity and player handles you define here.
• Spawners - Pair selectors and entity utilities with reusable spawning entry points.