Upgrader items

Evidence

Ran on Kiln's test stand (2026-11-04): UpgraderFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/world/item/ItemInstance; UpgraderFabricClient did not start: java.lang.NoClassDefFoundError: net/minecraft/world/MenuProvider.

What it needs from Kiln

• Mixin
• com.mojang.blaze3d.platform.NativeImage
• 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.creativetab.v1.FabricCreativeModeTab
• 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.components.Button
• net.minecraft.client.gui.components.Button.CreateNarration
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.components.EditBox
• net.minecraft.client.gui.screens.MenuScreens
• net.minecraft.client.gui.screens.MenuScreens.ScreenConstructor
• net.minecraft.client.gui.screens.inventory.AbstractContainerScreen
• net.minecraft.client.input.KeyEvent
• net.minecraft.client.input.MouseButtonEvent
• net.minecraft.client.renderer.RenderPipelines
• net.minecraft.client.renderer.texture.DynamicTexture
• net.minecraft.client.renderer.texture.TextureManager
• net.minecraft.client.resources.sounds.SimpleSoundInstance
• net.minecraft.client.sounds.SoundEngine
• net.minecraft.client.sounds.SoundEngine.PlayResult
• net.minecraft.client.sounds.SoundManager
• net.minecraft.core.NonNullList
• net.minecraft.core.RegistryAccess
• net.minecraft.network.FriendlyByteBuf
• 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.server.ReloadableServerRegistries
• net.minecraft.server.ReloadableServerRegistries.Holder
• net.minecraft.util.FormattedCharSequence
• net.minecraft.util.Mth
• net.minecraft.world.Container
• net.minecraft.world.SimpleContainer
• net.minecraft.world.SimpleMenuProvider
• and 82 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

try your luck and upgrade your items

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file upgrader-fabric-1.2.1+26.3.jar. The scan reads the mod's classes; it does not run them.