Small Logic Tweaks

Evidence

Ran on Kiln's test stand (2026-11-04): SmallLogicTweaks did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload; SmallLogicTweaksClient did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.entity.event.v1.ServerEntityLevelChangeEvents
• net.fabricmc.fabric.api.entity.event.v1.ServerEntityLevelChangeEvents.AfterPlayerChange
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndLevelTick
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents.Before
• net.fabricmc.fabric.api.event.player.UseBlockCallback
• net.fabricmc.fabric.api.item.v1.DefaultItemComponentEvents
• net.fabricmc.fabric.api.item.v1.DefaultItemComponentEvents.ModifyCallback
• net.fabricmc.fabric.api.item.v1.DefaultItemComponentEvents.ModifyContext
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
• net.fabricmc.fabric.api.resource.conditions.v1.ResourceCondition
• net.fabricmc.fabric.api.resource.conditions.v1.ResourceConditionType
• net.fabricmc.fabric.api.resource.conditions.v1.ResourceConditions
• net.minecraft.core.RegistryAccess
• net.minecraft.core.component.DataComponentMap
• net.minecraft.core.component.DataComponentMap.Builder
• net.minecraft.core.component.DataComponents
• net.minecraft.core.particles.ParticleTypes
• net.minecraft.network.FriendlyByteBuf
• net.minecraft.network.protocol.common.custom.CustomPacketPayload
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.Type
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.TypeAndCodec
• net.minecraft.resources.RegistryOps
• net.minecraft.resources.RegistryOps.RegistryInfoLookup
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.stats.ServerStatsCounter
• net.minecraft.stats.StatType
• net.minecraft.stats.Stats
• net.minecraft.tags.BlockTags
• net.minecraft.tags.ItemTags
• and 80 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 logic is weird. We’re making it make sense—one block at a time.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file small-logic-tweaks-fabric-1.6.0-mc26.3.jar. The scan reads the mod's classes; it does not run them.