Modify Player Data

Evidence

Server-side mod: Kiln runs mods' code on Horizon's single-player server, not on dedicated servers.

What it needs from Kiln

• Mixin
• net.minecraft.advancements.predicates.NbtPredicate
• net.minecraft.core.IdMap
• net.minecraft.core.component.DataComponents
• net.minecraft.nbt.CompoundTag
• net.minecraft.nbt.Tag
• net.minecraft.network.protocol.common.ClientboundPostEffectsPacket
• net.minecraft.network.protocol.game.ClientboundRemoveMobEffectPacket
• net.minecraft.network.protocol.game.ClientboundSetEntityMotionPacket
• net.minecraft.network.protocol.game.ClientboundSetEquipmentPacket
• net.minecraft.network.protocol.game.ClientboundSetHeldSlotPacket
• net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket
• net.minecraft.network.protocol.game.ClientboundUpdateMobEffectPacket
• net.minecraft.server.MinecraftServer
• net.minecraft.server.level.ServerChunkCache
• net.minecraft.server.level.ServerPlayer.RespawnConfig
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.stats.ServerRecipeBook
• net.minecraft.stats.ServerRecipeBook.Packed
• net.minecraft.util.ProblemReporter
• net.minecraft.util.ProblemReporter.PathElement
• net.minecraft.util.ProblemReporter.ScopedCollector
• net.minecraft.world.ItemStackWithSlot
• net.minecraft.world.effect.MobEffectInstance
• net.minecraft.world.entity.EntityEquipment
• net.minecraft.world.entity.EntityReference
• net.minecraft.world.entity.EntityTypes
• net.minecraft.world.entity.EquipmentSlot
• net.minecraft.world.entity.HumanoidArm
• net.minecraft.world.entity.ai.attributes.AttributeInstance.Packed
• net.minecraft.world.entity.ai.attributes.AttributeMap
• net.minecraft.world.entity.ai.attributes.DefaultAttributes
• net.minecraft.world.entity.monster.warden.WardenSpawnTracker
• net.minecraft.world.entity.player.Abilities
• net.minecraft.world.entity.player.Abilities.Packed
• net.minecraft.world.entity.player.Inventory
• net.minecraft.world.food.FoodData
• net.minecraft.world.inventory.PlayerEnderChestContainer
• net.minecraft.world.item.component.CustomData
• net.minecraft.world.item.crafting.RecipeHolder
• net.minecraft.world.item.crafting.RecipeManager
• and 66 more

On the roadmap: Code next to data (0.3), Machines (0.4), Mixin (0.5)

In the author's words

This mod allows Minecraft's data commands (/data, /execute store, etc.) to modify player data

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file modifyplayerdata-fabric-0.4.3-26.3.jar. The scan reads the mod's classes; it does not run them.