ModsJava
MCio
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on Modrinth
Minecraft Input/Output (MCio)
MCio mod | mcio_ctrl | Documentation | Discord
MCio is a Fabric mod that exposes a network interface to Minecraft for AI research. It accepts keyboard/mouse input and sends back video frames and game state over ZeroMQ.
Features
- Python library (mcio_ctrl) with Gymnasium environments
- Faster than real-time performance (>13x on an M3 laptop)
- Works with performance mods like Sodium
- Supports resource packs for varied training environments
- Connect/reconnect agents without restarting Minecraft
- Decoupled ZMQ protocol for easy integration
- Synchronous mode for fast training
- Asynchronous mode for real-time human/AI interaction
- Headless mode with GPU acceleration
- VPT and STEVE-1 support on modern Minecraft with Sodium
Links
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.3
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Ships as mcio-1.6.1+1.21.3.jar — drop this file into the mods folder
- Download size: 2.7 MB
- Download link checked 16 Oct 2026 — working
These come from our own check of the pack file, not from the source page.