MCLabs Addons

Evidence

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

What it needs from Kiln

• Mixin
• com.mojang.authlib.GameProfile
• com.mojang.authlib.properties.Property
• com.mojang.authlib.properties.PropertyMap
• com.mojang.blaze3d.platform.InputConstants.Key
• com.mojang.blaze3d.platform.Window
• com.mojang.blaze3d.vertex.VertexConsumer
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientEntityEvents
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientEntityEvents.Load
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStarted
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStopping
• net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents
• net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents.Chat
• net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents.Game
• net.fabricmc.fabric.api.client.message.v1.ClientSendMessageEvents
• net.fabricmc.fabric.api.client.message.v1.ClientSendMessageEvents.Command
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Join
• net.fabricmc.fabric.api.client.rendering.v1.level.LevelExtractionContext
• net.fabricmc.fabric.api.client.rendering.v1.level.LevelExtractionEvents
• net.fabricmc.fabric.api.client.rendering.v1.level.LevelExtractionEvents.EndExtraction
• net.fabricmc.fabric.api.event.player.AttackEntityCallback
• net.fabricmc.fabric.api.event.player.UseEntityCallback
• net.fabricmc.fabric.api.event.player.UseItemCallback
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.SharedConstants
• net.minecraft.WorldVersion
• net.minecraft.client.Options
• net.minecraft.client.User
• net.minecraft.client.gui.Hud
• net.minecraft.client.gui.components.AbstractSliderButton
• net.minecraft.client.gui.components.AbstractWidget
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.components.CycleButton
• net.minecraft.client.gui.components.CycleButton.Builder
• and 80 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 client-side mod for MCLabs that takes the information the server already tells you in chat and puts it where you can actually see it. (Lol)

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file mclabs-addons-1.18.1.jar. The scan reads the mod's classes; it does not run them.