WebGUI

Evidence

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

What it needs from Kiln

• Mixin
• com.mojang.blaze3d.platform.TextInputManager
• com.mojang.blaze3d.platform.Window
• com.mojang.blaze3d.platform.cursor.CursorType
• com.mojang.blaze3d.platform.cursor.CursorTypes
• com.mojang.blaze3d.systems.RenderSystem
• com.mojang.renderpearl.api.GpuFormat
• com.mojang.renderpearl.api.commands.CommandEncoder
• com.mojang.renderpearl.api.device.GpuDevice
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStopping
• 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.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents.AfterDeath
• net.fabricmc.fabric.api.event.EventFactory
• 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.ServerStarting
• net.fabricmc.fabric.api.event.player.UseEntityCallback
• 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.ServerPlayConnectionEvents.Join
• 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.loader.api.ModContainer
• net.fabricmc.loader.api.SemanticVersion
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.VersionParsingException
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.client.MouseHandler
• net.minecraft.client.OptionInstance
• net.minecraft.client.Options
• net.minecraft.client.input.CharacterEvent
• net.minecraft.client.input.KeyEvent
• and 56 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

Embed any web page — React, Vue, plain HTML — as a full-screen GUI or transparent HUD overlay inside Minecraft. Powered by Chromium (MCEF).

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file webgui-fabric-2.0.0+mc26.3.jar. The scan reads the mod's classes; it does not run them.