A
license-
qualityA
maintenanceEnables AI assistants to edit, run, inspect, and fix Godot 4 projects through an MCP server with dynamic tool groups and setup-gated capabilities.
Last updated
128
236
MIT
scratch-mcp
Allows reading, editing, and saving Scratch .sb3 project files programmatically, with tools for modifying sprites, scripts, costumes, sounds, and other project assets.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@scratch-mcpAdd a cat sprite that says 'Hello' when clicked"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
scratch4js
A pnpm monorepo of small, focused JavaScript packages for working with Scratch
and TurboWarp ā edit .sb3 projects programmatically, talk to the Scratch
website, drive it all from an AI agent, and build & bundle TurboWarp extensions.
š Documentation: https://playforge-coding.github.io/scratch4js/
Packages
Path | Package | What it is |
| The core library: read/edit | |
| A class-based wrapper for the Scratch website API: read public data, and log in to download/edit/publish | |
| An MCP server exposing the library's editing surface as tools, plus a TurboWarp live-reload bridge. | |
| webpack/Rspack plugin that bundles a multi-file TurboWarp extension into one IIFE-wrapped file. | |
| Rollup/Rolldown/Vite plugin that bundles a multi-file TurboWarp extension into one IIFE-wrapped file. | |
| Scaffolder ( | |
| Reusable React building blocks for in-browser IDEs: split-pane layout, Monaco, an xterm/WebContainer terminal, file tree. | |
| In-browser IDE (built on | |
| TurboWarp Desktop userscript (ES modules ā one IIFE): scratch-mcp live-reload + real-time collaboration over a WebSocket relay. |
Related MCP server: rbxsync-mcp
How they fit together
AI agent / MCP client
ā (MCP tools over stdio)
ā¼
āāāāāāāāāāāāāāāā edits in memory āāāāāāāāāāāāāā
ā scratch-mcp ā āāāāāāāāāāāāāāāāāāāŗ ā scratch4js ā
āāāāāāāā¬āāāāāāāā save ā .sb3 file āāāāāāāāāāāāāā
ā WebSocket bridge (localhost:9060)
ā¼ "loadSB3" ā fetch /get.sb3
TurboWarp Desktop + userscript āāāŗ live previewAn agent edits a project through scratch-mcp; on save the server writes the
.sb3 and signals the userscript, which reloads it into TurboWarp Desktop
instantly.
Getting started
pnpm install
pnpm build # build every package (-r build)
pnpm lint
pnpm fmt # prettier --write .Then:
Install the userscript into TurboWarp Desktop (
pnpm --filter userscript deploy; per-OS paths in its README).Run the MCP server and point your MCP client at it.
Open
.sb3files, edit, andsave_projectto see changes live.
Workspace layout
.
āāā packages/
ā āāā scratch4js/ # the core library (+ examples + example.sb3)
ā āāā s-api4js/ # Scratch website API wrapper
ā āāā scratch-mcp/ # the MCP server + live-reload bridge
ā āāā tw-plugin-webpack/ # webpack/Rspack extension bundler plugin
ā āāā tw-plugin-rollup/ # Rollup/Rolldown/Vite extension bundler plugin
ā āāā create-tw-extension/ # extension scaffolder CLI
ā āāā web-editor/ # in-browser IDE building blocks
ā āāā tw-extension-maker/ # in-browser extension IDE
ā āāā userscript/ # TurboWarp Desktop userscript: live-reload + collaboration
āāā docs/ # Rspress documentation site
āāā pnpm-workspace.yaml
āāā package.json # workspace root (build/lint/fmt delegate to -r)This server cannot be installed
Maintenance
āMaintainers
āResponse time
0dRelease cycle
11Releases (12mo)
Commit activity
Resources
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Looking for Admin?
If you are the server author, to access and configure the admin panel.
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