Harmonize – UI Overhaul

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): Harmonize did not start: java.lang.NoClassDefFoundError: net/minecraft/world/MenuProvider; HarmonizeClient did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload.

What it needs from Kiln

an access widener
Mixin
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking
net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.Context
net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.PlayPayloadHandler
net.minecraft.client.gui.screens.MenuScreens
net.minecraft.client.gui.screens.MenuScreens.ScreenConstructor
net.minecraft.client.gui.screens.inventory.AbstractMountInventoryScreen
net.minecraft.core.NonNullList
net.minecraft.network.RegistryFriendlyByteBuf
net.minecraft.network.codec.ByteBufCodecs
net.minecraft.network.codec.StreamCodec
net.minecraft.network.protocol.common.custom.CustomPacketPayload
net.minecraft.network.protocol.common.custom.CustomPacketPayload.Type
net.minecraft.network.protocol.common.custom.CustomPacketPayload.TypeAndCodec
net.minecraft.server.MinecraftServer
net.minecraft.util.Mth
net.minecraft.world.Container
net.minecraft.world.SimpleContainer
net.minecraft.world.SimpleMenuProvider
net.minecraft.world.entity.EquipmentSlot
net.minecraft.world.entity.HumanoidArm
net.minecraft.world.entity.animal.camel.Camel
net.minecraft.world.entity.animal.equine.AbstractChestedHorse
net.minecraft.world.entity.animal.equine.Donkey
net.minecraft.world.entity.animal.equine.Horse
net.minecraft.world.entity.animal.equine.Llama
net.minecraft.world.entity.animal.equine.Mule
net.minecraft.world.entity.animal.equine.SkeletonHorse
net.minecraft.world.entity.animal.equine.ZombieHorse
net.minecraft.world.entity.animal.happyghast.HappyGhast
net.minecraft.world.entity.animal.pig.Pig
net.minecraft.world.entity.animal.wolf.Wolf
net.minecraft.world.entity.monster.Strider
net.minecraft.world.entity.player.Inventory
net.minecraft.world.flag.FeatureFlags
net.minecraft.world.inventory.AbstractContainerMenu
net.minecraft.world.inventory.AbstractMountInventoryMenu
and 42 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Machines (0.4), Mixin (0.5)

In the author's words

Transform your interfaces into a work of art! Harmonize unifies all container menus, introduces a universal offhand slot, and polishes HUD elements for a seamless, visually stunning Minecraft experience.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file harmonize-0.5.1.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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