In-process MCP server + Kotlin REPL for Minecraft.
View on GitHub ↗Homepage ↗[!WARNING] This runs arbitrary code inside your game, and its bytecode injection reads as cheating. Whoever holds the access token gets a shell on this machine; anti-cheat that spots the mod bans you, or bans your players — see Before you install.
Turn a running Minecraft instance into an MCP server — as a mod on Fabric, Forge or NeoForge, or as a Paper plugin; client or dedicated server. An LLM connects over local HTTP and runs Kotlin directly inside the live game, compiled against the game's deobfuscated classpath: you write net.minecraft. in plain Mojang-mapping (mojmap) names and reach private, protected, package-private and Kotlin internal members with no reflection — the mod remaps and access-widens your code on the way in. It is the last Minecraft MCP server you need to install — early days, but the idea has nowhere further to go. Once a snippet reaches whatever the process reaches, a successor has nothing left to add.
One core (common), one thin entry point per host. The same executecode runs on an integrated server, a dedicated server, or a client; it is compiled once against the running game and remapped to whatever naming the runtime actually uses (dev mojmap, Fabric intermediary, Forge SRG, spigot obf).
The bearer token is the root password. Anyone holding it can compile and run arbitrary Kotlin — and therefore arbitrary JVM — inside the game process: file I/O, spawning processes, JNI, System.exit. There is no sandbox.
From the project README.
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