Rainbow

Evidence

Ran on Kiln's test stand (2026-11-04): RainbowClient did not start: java.lang.NoClassDefFoundError: net/minecraft/commands/synchronization/ArgumentTypeInfo.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.platform.NativeImage
• com.mojang.blaze3d.systems.RenderSystem
• com.mojang.renderpearl.api.GpuFormat
• com.mojang.renderpearl.api.buffers.GpuBuffer
• com.mojang.renderpearl.api.buffers.GpuBufferSlice
• com.mojang.renderpearl.api.buffers.GpuBufferSlice.MappedView
• com.mojang.renderpearl.api.commands.CommandEncoder
• com.mojang.renderpearl.api.device.GpuDevice
• com.mojang.renderpearl.api.textures.GpuTexture
• net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback
• net.fabricmc.fabric.api.client.command.v2.ClientCommands
• net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource
• net.fabricmc.fabric.api.command.v2.ArgumentTypeRegistry
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.TracingExecutor
• net.minecraft.client.ClientRecipeBook
• net.minecraft.client.gui.Hud
• net.minecraft.client.gui.components.SplashRenderer
• net.minecraft.client.gui.components.toasts.SystemToast
• net.minecraft.client.gui.components.toasts.SystemToast.SystemToastId
• net.minecraft.client.gui.components.toasts.ToastManager
• net.minecraft.client.gui.navigation.ScreenRectangle
• net.minecraft.client.gui.render.pip.OversizedItemRenderer
• net.minecraft.client.gui.screens.recipebook.RecipeCollection
• net.minecraft.client.multiplayer.ClientSuggestionProvider
• net.minecraft.client.renderer.GameRenderer
• net.minecraft.client.renderer.block.dispatch.BlockStateModel
• net.minecraft.client.renderer.block.dispatch.BlockStateModel.UnbakedRoot
• net.minecraft.client.renderer.item.ItemModelResolver
• net.minecraft.client.renderer.item.TrackingItemStackRenderState
• net.minecraft.client.renderer.state.gui.GuiItemRenderState
• net.minecraft.client.renderer.state.gui.GuiRenderState
• net.minecraft.client.renderer.state.gui.pip.OversizedItemRenderState
• net.minecraft.client.renderer.texture.SpriteContents
• net.minecraft.client.renderer.texture.SpriteContents.AnimatedTexture
• net.minecraft.client.renderer.texture.SpriteContents.FrameInfo
• net.minecraft.client.renderer.texture.TextureAtlas
• net.minecraft.client.renderer.texture.TextureAtlasSprite
• and 39 more

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

In the author's words

A Minecraft mod to generate Geyser mappings and bedrock resourcepacks for use with Geyser's custom content APIs

Scan

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