Game Builder

An MCP server that helps any coding agent build games. Plug it into Claude Code, Codex, Cursor, Windsurf, Gemini CLI or any other MCP client, then say "make me a game where…". Your agent does the thinking and writing with its own model; Game Builder gives it the game know-how and tools. No API key needed.

It draws on the genres that make up most of the game market and the engines most used for games on GitHub, with open-source games to learn from in each genre.

What your agent gets

It also offers the guides as resources (gamebuilder://playbook, gamebuilder://stacks, gamebuilder://genres) and a new_game prompt.

The genre guide covers 21 genres: action/platformer, roguelike, RPG, shooter, survival/crafting, strategy, tower defense, simulation/management, racing, fighting, sports, puzzle, casual mobile, card/deck builder, visual novel, dress-up, rhythm, idle, horror, party/social deduction and online multiplayer/MMO.

Install

Needs uv (or Python 3.10+ with pipx). The server is on PyPI as game-builder-mcp and runs with:

uvx game-builder-mcp

Add it to your agent:

Claude Code

claude mcp add game-builder -- uvx game-builder-mcp

Codex (~/.codex/config.toml)

[mcp_servers.game-builder]
command = "uvx"
args = ["game-builder-mcp"]

Cursor (.cursor/mcp.json), Windsurf, Claude Desktop and most other clients use the same JSON shape:

{
  "mcpServers": {
    "game-builder": {
      "command": "uvx",
      "args": ["game-builder-mcp"]
    }
  }
}

Gemini CLI (~/.gemini/settings.json): the same mcpServers block.

To run the latest code from GitHub instead of the PyPI release, use uvx --from git+https://github.com/wuisabel-gif/game-builder game-builder-mcp.

Use

Ask your agent, for example:

• "Use game-builder to make a Vampire Survivors-style game for the browser."
• "Make a Godot roguelike with procedurally generated rooms."
• "Build an online party game with room codes where friends join from their phones."
• "Set up a Unity tower defense game for mobile."
• "Write the image prompt for a 4-frame walk cycle, 256 × 256 per frame."

The agent plans, scaffolds, builds, checks and playtests the game itself, then serves it for you to play. The first playtest downloads a headless Chromium (about 150 MB).

Develop

uv run --with . python tests/test_tools.py

Releases: bump __version__ in gamebuilder/__init__.py, merge, then publish a GitHub release tagged v<version>. The Publish workflow builds the package and uploads it to PyPI with trusted publishing.

License

MIT