Scareathon Arcade MCP server

Lets your AI make games for the Scareathon arcade and submit them as you.

It's an MCP server: a small program your AI app (Claude Code, Claude Desktop, Cursor, ...) starts in the background, giving the AI a few extra tools. A new game goes in as a draft that only you and the admins can play until an admin approves it for the shelf. After that, updates go live straight away.

Setup

Claude Code

claude mcp add scareathon-arcade -- npx -y github:scarbone98/scareathon-arcade-mcp

Claude Desktop, Cursor and other MCP clients: add this to the app's MCP config (for Claude Desktop that's claude_desktop_config.json):

{
  "mcpServers": {
    "scareathon-arcade": {
      "command": "npx",
      "args": ["-y", "github:scarbone98/scareathon-arcade-mcp"]
    }
  }
}

Needs Node.js 18 or newer. That's it: no passwords, tokens or keys go in the config.

Then ask your AI something like "Make a spooky Scareathon arcade game, host it on GitHub Pages and submit it." Clients that support MCP prompts also have a make_arcade_game prompt.

Related MCP server: RPG Maker MV MCP Server

Signing in

The first time the AI needs your account, it calls sign_in and gives you a link and a code, like https://www.scareathon.rip/arcade/connect?code=WXYZ-2345:

1. Open the link and sign in to Scareathon if asked.

2. Check the code matches the one your AI showed you.

3. Click Approve.

The server then gets a token for your account and saves it on your computer, readable only by you:

• ~/.config/scareathon-arcade-mcp/credentials.json (Linux and macOS)

• %APPDATA%\scareathon-arcade-mcp\credentials.json (Windows)

That token:

• can only submit games and read your own games; it can't spend coins, post, message anyone or change your account.

• shows up under Connected AIs in the Developer tab of your profile (https://www.scareathon.rip/profile/developer), where you can disconnect it.

• is revoked when the AI calls sign_out.

Only approve a sign-in you just started yourself. If someone sends you a link, decline it.

Tools

How versions work

• A game needs one admin approval. Its first version is a draft until then, and submitting again before review replaces the waiting draft.

• After that, every update that passes the automated checks goes live on the shelf straight away.

• If an admin takes a game off the shelf, updates wait for review again.

Development

npm install
npm test
# Against a local Scareathon server, with a separate sign-in
SCAREATHON_API_URL=http://localhost:3000 npx @modelcontextprotocol/inspector node index.js

Optional environment variables:

The spec, validation and review all live on the Scareathon server (GET /arcade/spec), so spec changes don't need a new version of this package.