April Fools

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): ModFabric did not start: java.lang.NoSuchMethodError: 'java.util.Optional net.fabricmc.loader.api.FabricLoader.getModContainer(java.lang.String)'; ModFabricClient did not start: java.lang.NoSuchMethodError: 'java.util.Optional net.fabricmc.loader.api.FabricLoader.getModContainer(java.lang.String)'.

What it needs from Kiln

Mixin
net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents
net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents.Before
net.minecraft.client.resources.sounds.SimpleSoundInstance
net.minecraft.client.resources.sounds.SoundInstance
net.minecraft.client.sounds.SoundEngine
net.minecraft.client.sounds.SoundEngine.PlayResult
net.minecraft.commands.CommandSourceStack
net.minecraft.commands.Commands
net.minecraft.commands.Commands.CommandSelection
net.minecraft.core.RegistryAccess
net.minecraft.server.MinecraftServer
net.minecraft.server.permissions.PermissionSet
net.minecraft.server.permissions.Permissions
net.minecraft.world.effect.MobEffect
net.minecraft.world.entity.item.ItemEntity
net.minecraft.world.entity.monster.skeleton.Skeleton
net.minecraft.world.entity.npc.wanderingtrader.WanderingTraderSpawner
net.minecraft.world.entity.projectile.arrow.Arrow
net.minecraft.world.phys.AABB
Registry.wrapAsHolder()
Registries.MOB_EFFECT
Items.IRON_SWORD
Items.LAVA_BUCKET
Items.POISONOUS_POTATO
Items.POTATO
Items.SHIELD
Items.WATER_BUCKET
Level.getEntities()
Level.getServer()
Level.registryAccess()
Blocks.POTATOES

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

🃏 Enables various silly and funny configurable features on April Fools' day!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file aprilfools-26.3.0-2.1.jar. The scan reads the mod's classes; it does not run them.

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