Copper Ledgers

Evidence

Ran on Kiln's test stand (2026-11-04): CopperLedgers did not start: java.lang.NoSuchFieldError: Class net.minecraft.core.registries.BuiltInRegistries does not have member field 'net.minecraft.core.Registry DATA_COMPONENT_TYPE'; CopperLedgersClient did not start: java.lang.NoSuchFieldError: Class net.minecraft.core.registries.BuiltInRegistries does not have member field 'net.minecraft.core.Registry MENU'.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.item.v1.ItemComponentTooltipProviderRegistry
• net.minecraft.client.gui.screens.MenuScreens
• net.minecraft.client.gui.screens.MenuScreens.ScreenConstructor
• net.minecraft.client.gui.screens.inventory.AbstractContainerScreen
• net.minecraft.client.renderer.RenderPipelines
• net.minecraft.core.NonNullList
• net.minecraft.core.component.DataComponentGetter
• net.minecraft.core.component.DataComponentType
• net.minecraft.core.component.DataComponentType.Builder
• net.minecraft.core.component.DataComponents
• net.minecraft.network.codec.ByteBufCodecs
• net.minecraft.network.codec.StreamCodec
• net.minecraft.network.codec.StreamCodec.CodecOperation
• net.minecraft.world.SimpleContainer
• net.minecraft.world.SimpleMenuProvider
• net.minecraft.world.entity.player.Inventory
• net.minecraft.world.flag.FeatureFlags
• net.minecraft.world.inventory.AbstractContainerMenu
• net.minecraft.world.inventory.ClickAction
• net.minecraft.world.inventory.ContainerInput
• net.minecraft.world.inventory.MenuType
• net.minecraft.world.inventory.MenuType.MenuSupplier
• net.minecraft.world.inventory.Slot
• net.minecraft.world.item.Item.TooltipContext
• net.minecraft.world.item.TooltipFlag
• net.minecraft.world.item.component.TooltipProvider
• GuiGraphicsExtractor.blit()
• GuiGraphicsExtractor.outline()
• DefaultedRegistry.byNameCodec()
• BuiltInRegistries.DATA_COMPONENT_TYPE
• BuiltInRegistries.MENU
• ServerPlayer.openMenu()
• SoundEvents.BOOK_PAGE_TURN
• SoundEvents.COPPER_HIT
• SoundEvents.COPPER_STEP
• Player.getInventory()
• Player.playSound()
• Player.playSound()
• Item.Properties.component()
• ItemStack.copyWithCount()
• and 7 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

Help your golems remember where things go!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file copper_ledgers-1.0.3+26.3.jar. The scan reads the mod's classes; it does not run them.