Which integrations are available for this server?

Allows reading, editing, and saving Scratch .sb3 project files programmatically, with tools for modifying sprites, scripts, costumes, sounds, and other project assets.

How do I use scratch-mcp?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@scratch-mcp Add 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.

scratch-mcp

by playforge-coding

Overview Schema Related Servers Score Discussions

JavaScript

Local

scratch4js

A pnpm monorepo for working with Scratch .sb3 projects from JavaScript — edit them programmatically, drive them from an AI agent, and preview the results live in TurboWarp Desktop.

Packages

Path	Package	What it is
`packages/scratch4js`	`scratch4js`	The core library: read/edit `.sb3` files with a small, declarative API.
`packages/scratch-mcp`	`scratch-mcp`	An MCP server exposing the library's editing surface as tools, plus a TurboWarp live-reload bridge.
`userscript`	—	Prebuilt TurboWarp Desktop userscript + userstyle that live-reload the project the MCP server edits.

Related MCP server: tanstack-start-devtools

How they fit together

  AI agent / MCP client
          │  (MCP tools over stdio)
          ▼
   ┌──────────────┐   edits in memory   ┌────────────┐
   │  scratch-mcp │ ──────────────────► │ scratch4js │
   └──────┬───────┘   save → .sb3 file  └────────────┘
          │ socket.io bridge (localhost:9060)
          ▼  "loadSB3" → fetch /get.sb3
   TurboWarp Desktop + userscript  ──►  live preview

An 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 (scratch4js → dist/)
pnpm lint
pnpm format

Then:

Install the userscript into TurboWarp Desktop (per-OS paths in its README).
Run the MCP server and point your MCP client at it.
Open .sb3 files, edit, and save_project to see changes live.

Workspace layout

.
├── packages/
│   ├── scratch4js/     # the library (+ example_project fixture)
│   └── scratch-mcp/    # the MCP server + live-reload bridge
├── userscript/         # prebuilt TurboWarp Desktop userscript + userstyle
├── pnpm-workspace.yaml
└── package.json        # workspace root (build/lint/format delegate to -r)

This server cannot be installed

license - permissive license

quality - not tested

maintenance

How are these scores calculated?

Maintenance

–Maintainers

–Response time

0dRelease cycle

7Releases (12mo)

Commit activity

Resources

GitHub Repository

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