MCPFabric

Evidence

Ran on Kiln's test stand (2026-11-04): FabricEntrypoint did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/BlockGetter; FabricClientEntrypoint did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/Packet.

What it needs from Kiln

• com.mojang.authlib.GameProfile
• com.mojang.blaze3d.platform.NativeImage
• net.fabricmc.api.EnvType
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents
• 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.entity.event.v1.ServerLivingEntityEvents
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents.AfterDeath
• net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents.AllowDamage
• 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.ServerLifecycleEvents.ServerStopping
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
• net.fabricmc.fabric.api.message.v1.ServerMessageEvents
• net.fabricmc.fabric.api.message.v1.ServerMessageEvents.ChatMessage
• 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.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.client.ClientRecipeBook
• net.minecraft.client.Options
• net.minecraft.client.Screenshot
• net.minecraft.client.gui.components.AbstractButton
• net.minecraft.client.gui.components.AbstractSliderButton
• net.minecraft.client.gui.components.AbstractStringWidget
• net.minecraft.client.gui.components.AbstractWidget
• net.minecraft.client.gui.components.Checkbox
• net.minecraft.client.gui.components.CycleButton
• net.minecraft.client.gui.components.EditBox
• net.minecraft.client.gui.components.events.ContainerEventHandler
• net.minecraft.client.gui.components.events.GuiEventListener
• net.minecraft.client.gui.screens.AlertScreen
• net.minecraft.client.gui.screens.ChatScreen
• net.minecraft.client.gui.screens.ConfirmLinkScreen
• and 82 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Machines (0.4)

In the author's words

Give AI agents full control of Minecraft. A Fabric mod + MCP server that lets Claude and other MCP clients observe and play the game — 50+ tools, for Minecraft 1.21.1–26.3.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file mcpfabric-0.8.0+26.3.jar. The scan reads the mod's classes; it does not run them.