WyWF

Evidence

Ran on Kiln's test stand (2026-11-04): WYWFClient did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/screens/worldselection/CreateWorldScreen.

What it needs from Kiln

• an access widener
• Mixin
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStopping
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.client.gui.screens.worldselection.CreateWorldScreen
• net.minecraft.client.gui.screens.worldselection.WorldCreationUiState
• net.minecraft.core.HolderLookup.RegistryLookup
• net.minecraft.core.HolderSet
• net.minecraft.core.SectionPos
• net.minecraft.data.registries.VanillaRegistries
• net.minecraft.world.level.ChunkPos
• net.minecraft.world.level.biome.BiomeResolver
• net.minecraft.world.level.biome.BiomeSource
• net.minecraft.world.level.biome.Biomes
• net.minecraft.world.level.biome.Climate
• net.minecraft.world.level.biome.Climate.Sampler
• net.minecraft.world.level.biome.MultiNoiseBiomeSource
• net.minecraft.world.level.biome.MultiNoiseBiomeSourceParameterLists
• net.minecraft.world.level.levelgen.NoiseGeneratorSettings
• net.minecraft.world.level.levelgen.NoiseRouter
• net.minecraft.world.level.levelgen.NoiseSettings
• net.minecraft.world.level.levelgen.RandomState
• net.minecraft.world.level.levelgen.densityfunction.DensityBuffer
• net.minecraft.world.level.levelgen.densityfunction.DensitySampler
• net.minecraft.world.level.levelgen.densityfunction.DensitySampler.Bound
• net.minecraft.world.level.levelgen.densityfunction.DensityVolume
• net.minecraft.world.level.levelgen.densityfunction.SamplerContext
• net.minecraft.world.level.levelgen.densityfunction.SamplerContext.Builder
• net.minecraft.world.level.levelgen.structure.Structure
• net.minecraft.world.level.levelgen.structure.StructureSet
• net.minecraft.world.level.levelgen.structure.StructureSet.StructureSelectionEntry
• net.minecraft.world.level.levelgen.structure.placement.AbstractSpreadingStructurePlacement
• net.minecraft.world.level.levelgen.structure.placement.AbstractSpreadingStructurePlacement.ExclusionZone
• net.minecraft.world.level.levelgen.structure.placement.ConcentricRingsStructurePlacement
• net.minecraft.world.level.levelgen.structure.placement.RandomSpreadStructurePlacement
• net.minecraft.world.level.levelgen.structure.placement.StructurePlacement
• FabricLoader.getModContainer()
• Minecraft.execute()
• Minecraft.setScreenAndShow()
• and 10 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

Minecraft seed finder right in the world creation menu in the seed input field

Scan

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