Developers

A Myriad addon is an ordinary Fabric mod with a myriad entrypoint. Everything players see in Myriad, including the stock modules, comes from addons built on the same public API (dev.myriadclient.api). Myriad core itself is the menu, the settings system, the services and the glue.

What the API gives you:

Modules with typed settings, binds, hold mode and HUD info, saved per profile.
An event bus for ticks, packets, input, rendering, the world and the UI.
Services so addons share one implementation of hard things: rotations (with move fix), inventory and silent swaps, placement, breaking (vanilla, packet and Grim-timed), building from blueprints, containers, tasks over ticks, the packet budget, elytra flight.
Windows and HUD elements drawn with an SDF canvas, a widget toolkit, and title-bar controls.
World rendering: immediate shapes, GPU meshes, per-chunk caches, shader highlights.
Hooks: replace a service with your own, or change one decision in Myriad or another addon.
Control panel presets and shared configs.

A complete addon

src/main/java/com/example/addon/MyAddon.java


package com.example.addon;
 
import dev.myriadclient.api.addon.AddonContext;
import dev.myriadclient.api.addon.MyriadAddon;
 
public final class MyAddon implements MyriadAddon {
    @Override
    public void initialize(AddonContext ctx) {
        ctx.registerModules(new Greeter());
    }
}

src/main/java/com/example/addon/Greeter.java


package com.example.addon;
 
import dev.myriadclient.api.event.Subscribe;
import dev.myriadclient.api.event.events.WorldEvent;
import dev.myriadclient.api.module.Categories;
import dev.myriadclient.api.module.Module;
import dev.myriadclient.api.setting.StringSetting;
 
public final class Greeter extends Module {
    private final StringSetting message = sgGeneral.string("Message")
        .description("Shown when you join a world.")
        .defaultValue("Welcome back!")
        .build();
 
    public Greeter() {
        super(Categories.MISC, "Greeter", "Greets you when you join a world.");
    }
 
    @Subscribe
    private void onJoin(WorldEvent.Join e) {
        info(message.get());   // a chat line tagged [Myriad]
    }
}

src/main/resources/fabric.mod.json


{
  "schemaVersion": 1,
  "id": "my-addon",
  "version": "${version}",
  "name": "My Addon",
  "environment": "client",
  "entrypoints": { "myriad": ["com.example.addon.MyAddon"] },
  "depends": { "myriad": ">=0.3.0", "minecraft": "~26.2" }
}

That’s an addon: the module shows in the menu under Misc · My Addon, has a Message setting, a keybind, hold mode, and its on/off state and settings save with the player’s profile.

Start from the addon template , and read the example addon for every pattern in use.

Where to go

Setting up Modules Settings Services Hooks For AI agents