Mob Filter

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

Evidence

Ran on Kiln's test stand (2026-11-04): FabricModInitializer did not start: java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager; FabricClientModInitializer did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/client/networking/v1/ClientPlayConnectionEvents.

What it needs from Kiln

Mixin
net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Join
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarting
net.minecraft.core.Direction.Axis
net.minecraft.core.RegistryAccess
net.minecraft.server.ServerScoreboard
net.minecraft.world.Difficulty
net.minecraft.world.attribute.EnvironmentAttributeSystem
net.minecraft.world.attribute.EnvironmentAttributes
net.minecraft.world.entity.EntitySpawnReason
net.minecraft.world.entity.MobCategory
net.minecraft.world.level.LightLayer
net.minecraft.world.level.MoonPhase
net.minecraft.world.level.biome.Biome
net.minecraft.world.level.storage.LevelData
net.minecraft.world.level.storage.ServerLevelData
net.minecraft.world.scores.ReadOnlyScoreInfo
net.minecraft.world.scores.ScoreHolder
org.apache.logging.log4j.Level
org.apache.logging.log4j.LogManager
org.apache.logging.log4j.Logger
org.apache.logging.log4j.core.config.Configurator
BlockPos.get()
BuiltInRegistries.ENTITY_TYPE
Registries.BIOME
ServerLevel.environmentAttributes()
ServerLevel.getBiome()
ServerLevel.getBrightness()
ServerLevel.getDifficulty()
ServerLevel.getLevelData()
ServerLevel.getMaxLocalRawBrightness()
ServerLevel.getOverworldClockTime()
ServerLevel.getScoreboard()
ServerLevel.isRainingAt()
ServerLevel.isThundering()
ServerLevel.registryAccess()

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

Serverside rules to limit mob spawning

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file mobfilter-fabric-0.29.0+26.3.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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