HarderCover

Evidence

Ran on Kiln's test stand (2026-11-04): Initializer did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/components/AbstractWidget.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.platform.InputConstants.Key
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.AfterInit
• net.fabricmc.fabric.api.client.screen.v1.Screens
• net.fabricmc.fabric.api.resource.v1.ResourceLoader
• net.fabricmc.fabric.api.resource.v1.pack.PackActivationType
• net.minecraft.client.ClientRecipeBook
• net.minecraft.client.OptionInstance
• net.minecraft.client.OptionInstance.TooltipSupplier
• net.minecraft.client.Options
• net.minecraft.client.gui.components.CycleButton
• net.minecraft.client.gui.components.CycleButton.Builder
• net.minecraft.client.gui.components.CycleButton.OnValueChange
• net.minecraft.client.gui.components.ImageButton
• net.minecraft.client.gui.components.Tooltip
• net.minecraft.client.gui.screens.inventory.AbstractContainerScreen
• net.minecraft.client.gui.screens.recipebook.RecipeBookComponent
• net.minecraft.client.gui.screens.recipebook.RecipeUpdateListener
• net.minecraft.client.multiplayer.MultiPlayerGameMode
• net.minecraft.network.chat.Style
• net.minecraft.server.packs.PackResources
• net.minecraft.server.packs.PackType
• net.minecraft.server.packs.repository.PackRepository
• net.minecraft.server.packs.resources.IoSupplier
• net.minecraft.server.packs.resources.ResourceManager
• net.minecraft.server.packs.resources.ResourceManagerReloadListener
• net.minecraft.world.inventory.AbstractContainerMenu
• net.minecraft.world.inventory.ContainerInput
• org.apache.commons.codec.digest.MessageDigestAlgorithms
• net.minecraft.client.gui.components.AbstractWidget
• InputConstants.isKeyDown()
• KeyMappingHelper.getBoundKeyOf()
• FabricLoader.getModContainer()
• Minecraft.execute()
• Minecraft.gameMode
• Minecraft.getResourcePackRepository()
• Minecraft.options
• ClientPacketListener.updateSearchTrees()
• LocalPlayer.getRecipeBook()
• MutableComponent.withStyle()

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

Adds a few vanilla-adjacent QOL tweaks to the Recipe Book. Fork of Hardcover.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file hardercover-1.1.3+26.3.jar. The scan reads the mod's classes; it does not run them.