Worldgen Devtools

Evidence

Ran on Kiln's test stand (2026-11-04): VanillaCommandsInit did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/command/v2/CommandRegistrationCallback; DfCommandInit did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/command/v2/CommandRegistrationCallback; EnvironmentAttributesInit did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/attachment/v1/AttachmentRegistry$Builder; Reloa.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.vertex.PoseStack
• net.fabricmc.fabric.api.attachment.v1.AttachmentRegistry
• net.fabricmc.fabric.api.attachment.v1.AttachmentRegistry.Builder
• net.fabricmc.fabric.api.attachment.v1.AttachmentSyncPredicate
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents.After
• net.fabricmc.fabric.api.event.player.UseBlockCallback
• net.fabricmc.fabric.api.gamerule.v1.GameRuleBuilder
• net.fabricmc.fabric.api.gamerule.v1.GameRuleBuilder.BooleanRuleBuilder
• net.minecraft.client.color.item.ItemTintSource
• net.minecraft.client.color.item.ItemTintSources
• net.minecraft.client.gui.components.debug.DebugEntryNoop
• net.minecraft.client.gui.components.debug.DebugScreenEntries
• net.minecraft.client.model.geom.PartPose
• net.minecraft.client.model.geom.builders.CubeListBuilder
• net.minecraft.client.model.geom.builders.MeshDefinition
• net.minecraft.client.model.geom.builders.PartDefinition
• net.minecraft.client.renderer.SubmitNodeCollector
• net.minecraft.client.renderer.blockentity.BlockEntityRenderer
• net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider
• net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider.Context
• net.minecraft.client.renderer.blockentity.BlockEntityRenderers
• net.minecraft.client.renderer.blockentity.state.BlockEntityRenderState
• net.minecraft.client.renderer.feature.ModelFeatureRenderer
• net.minecraft.client.renderer.feature.ModelFeatureRenderer.CrumblingOverlay
• net.minecraft.client.renderer.rendertype.RenderTypes
• net.minecraft.client.renderer.texture.OverlayTexture
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.arguments.NbtTagArgument
• net.minecraft.commands.arguments.ResourceArgument
• net.minecraft.commands.arguments.ResourceKeyArgument
• net.minecraft.commands.arguments.coordinates.BlockPosArgument
• net.minecraft.core.FrontAndTop
• net.minecraft.core.HolderGetter
• net.minecraft.core.HolderGetter.Provider
• net.minecraft.core.RegistryAccess
• net.minecraft.core.RegistryAccess.Frozen
• and 59 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

A mod that aids in the development of world generation data packs and mods. Allows reloading worldgen data packs in-game and resetting chunks. Colors jigsaw blocks by name and target.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file worldgenDevtools-1.4.1+26.3.jar. The scan reads the mod's classes; it does not run them.