MezzConfigGUI

Evidence

Ran on Kiln's test stand (2026-11-04): ConfigGuiFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload; ConfigGuiFabricClient did not start: java.lang.NoClassDefFoundError: net/minecraft/server/packs/resources/PreparableReloadListener.

What it needs from Kiln

• an access widener
• com.mojang.blaze3d.platform.InputConstants.Key
• com.mojang.blaze3d.platform.NativeImage
• com.mojang.blaze3d.platform.TextInputManager
• com.mojang.blaze3d.platform.Window
• com.mojang.blaze3d.platform.cursor.CursorTypes
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStarted
• 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.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.client.screen.v1.ScreenEvents
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.AfterExtract
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.AfterInit
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.BeforeExtract
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopped
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.Context
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.resource.v1.ResourceLoader
• net.fabricmc.loader.api.EntrypointException
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.entrypoint.EntrypointContainer
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.SharedConstants
• net.minecraft.client.KeyboardHandler
• net.minecraft.client.MouseHandler
• net.minecraft.client.Options
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• and 82 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

Client-side config screen for Minecraft mods

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file mezz_config_gui-26.3-fabric-mc26.3-0.6.3.jar. The scan reads the mod's classes; it does not run them.