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See Muster in action

A simulated session: a modder asks an Arma Reforger question and an MCP-connected assistant answers using Muster's tools — grounded in the real Bohemia script corpus, with the replication traps called out. This is a scripted demo, not a live model.

arrag · live demo — assistant calling MCP tools
Modder
I'm building a fuel system for a vehicle in Arma Reforger. How do I sync the fuel level to all clients the right way?
Assistant + Muster
search_scriptsplan_replication
Fuel level is server-authoritative state, so replicate it as a property — not an RPC. Use [RplProp] with an onRplName callback. Gotcha the corpus flags: writing the value on the server does NOT fire the callback locally, so call it yourself after writing.
[RplProp(onRplName: "OnRplFuel")]
protected float m_fFuel;

void SetFuel(float v)        // server only
{
    m_fFuel = v;
    Replication.BumpMe();
    OnRplFuel();             // writer self-invokes
}

void OnRplFuel() { /* refresh HUD */ }
Modder
Nice. And a refuel action a player can trigger from the fuel pump?
Assistant + Muster
scaffold_useractionplan_replication
Player input has to reach the server, so the action calls a server RPC (RplRcver.Server). Key trap: if the vehicle is server-owned, a client RPC sent on the vehicle is silently dropped — route it through the player's owned entity instead. scaffold_useraction gives you the ScriptedUserAction wired up correctly.

About Muster

Muster is a small, focused MCP server that gives an AI coding assistant accurate, grounded knowledge of Arma Reforger's Enfusion EnScript. Instead of guessing at engine APIs, your assistant retrieves real classes, members, RPCs and replication patterns from Bohemia Interactive's published script corpus, and can scaffold idiomatic components, game modes, user actions and UI from that same grounding. It's built for modders who'd rather their AI stopped inventing functions that don't exist.

It's an early, independent project from Horizon Studios. The corpus auto-syncs from Bohemia's public repository, so the knowledge tracks the live game. Over time we'd like to deepen the replication tooling, broaden codegen coverage, and add project memory so the assistant remembers your mod's conventions across sessions. The free tier is genuinely generous — every deterministic tool (search, scaffold, validate, plan replication) is unlimited, Bohemia's corpus is never paywalled, and you get 100 grounded AI answers every month. Pro ($15/mo) lifts that to 2000 answers a month — for people who live in the AI Q&A path.

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