gms-mcp 0.1.16

GameMaker CLI + MCP server toolset

GameMaker MCP Tools

This repo provides:

• gms: a Python CLI for GameMaker project operations (asset creation, maintenance, runner, etc).
• gms-mcp: an MCP server that exposes the same operations as MCP tools (Cursor is the primary example client).
• Introspection: complete project inspection with support for all asset types (including extensions and datafiles).
• MCP Resources: addressable project index and asset graph for high-performance agent context loading.
• gms-mcp-init: generates shareable MCP config files for a workspace. Now auto-detects environment variables like GMS_MCP_GMS_PATH to include in the generated config.

Install (recommended: pipx)

pipx install gms-mcp

Local Development Setup

If you are working on the gms-mcp codebase itself, follow these steps to set up a local development environment:

1. Clone and install in editable mode:

   git checkout dev
   pip install -e .
   

2. Initialize local and global MCP servers for testing: We recommend setting up two separate MCP server configurations in Cursor to test your changes:

   • Global (gms-global): For general use across all your GameMaker projects.
   • Local (gms-local): Specifically for testing your current changes to the server.

   Run these commands from the project root:

   # Global setup (names it 'gms-global' in Cursor)
   gms-mcp-init --cursor-global --server-name gms-global --mode python-module --python python --non-interactive
   
   # Local setup (names it 'gms-local' in Cursor)
   gms-mcp-init --cursor --server-name gms-local --mode python-module --python python --non-interactive
   

3. Verify in Cursor: Go to Cursor Settings > Features > MCP to see your new servers. You may need to click "Reload" or restart Cursor to see changes.

Publishing (maintainers)

Publishing is automated via GitHub Actions (PyPI Trusted Publishing) on every push to main and on tags v*. See RELEASING.md for the one-time PyPI setup and the first manual upload helper scripts.

Use with a GameMaker project (multi-project friendly)

Run this inside each GameMaker project workspace (or repo) to generate config:

gms-mcp-init --cursor

This writes .cursor/mcp.json and attempts to auto-detect the .yyp location to set GM_PROJECT_ROOT.

For a one-time setup that works across many projects, write Cursor's global config instead:

gms-mcp-init --cursor-global

Generate example configs for other MCP-capable clients:

gms-mcp-init --vscode --windsurf --antigravity

Or generate everything at once:

gms-mcp-init --all

Monorepos / multiple .yyp

If multiple .yyp projects are detected in a workspace:

• gms-mcp-init will warn and (when interactive) prompt you to pick one.
• In non-interactive environments, it defaults GM_PROJECT_ROOT to ${workspaceFolder} (safe).

Force a specific project root:

gms-mcp-init --cursor --gm-project-root path\\to\\project

Preview output without writing files:

gms-mcp-init --cursor --dry-run

Introspection Tools

The MCP server provides comprehensive project introspection capabilities:

Asset Listing (gm_list_assets)

List all assets in your project, optionally filtered by type:

• Supported types: script, object, sprite, room, sound, font, shader, path, timeline, tileset, animcurve, sequence, note, folder, extension, includedfile (datafiles)

Asset Reading (gm_read_asset)

Read the complete .yy JSON metadata for any asset by name or path.

Reference Search (gm_search_references)

Search for patterns across project files with:

• Scopes: all, gml, yy, scripts, objects, extensions, datafiles
• Modes: literal string or regex
• Options: case sensitivity, max results

Asset Graph (gm_get_asset_graph)

Build a dependency graph of assets with two modes:

• Shallow (fast): Parses .yy files for structural references (parent objects, sprites, etc.)
• Deep (complete): Also scans all GML code for runtime references like instance_create, sprite_index, audio_play_sound, etc.

MCP Resources

Pre-built, cacheable project data for agents:

• gms://project/index: Complete project structure (assets, folders, room order, audio/texture groups, IDE version)
• gms://project/asset-graph: Asset dependency graph
• gms://system/updates: Returns a human-readable message if a newer version of gms-mcp is available on PyPI or GitHub.

Update Notifier

The server automatically checks for updates on startup and during common operations:

• Tool: gm_check_updates returns structured update info.
• Auto-check: gm_project_info includes an updates field.
• Resource: gms://system/updates provides a quick text status.

CLI usage

Run from a project directory (or pass --project-root):

gms --version
gms --project-root . asset create script my_function --parent-path "folders/Scripts.yy"