GrowBlocks Dev Kit MCP server

GrowBlocks Dev Kit for Claude, Cursor and other AI assistants

Make a browser game with an AI assistant and ship it on GrowBlocks: three.js, Rapier physics, characters, multiplayer rooms and hosting, with no setup.

The assistant reads the API, writes game.js, plays the game headless and looks at a screenshot after every change, reuses parts other developers published (blocks), and pushes an unlisted test build you can share. Nothing goes public until you submit it and GrowBlocks reviews it.

Install

Claude Code (plugin: tools + skill)

/plugin marketplace add Gioluan/growblocks-devkit
/plugin install growblocks@growblocks

Claude Code (just the MCP server)

claude mcp add growblocks -- npx -y growblocks mcp

Claude Desktop: download growblocks.mcpb from the latest release and open it.

Cursor / Windsurf / any MCP client

{ "mcpServers": { "growblocks": { "command": "npx", "args": ["-y", "growblocks", "mcp"] } } }

Terminal: npx growblocks new my-game, then npx growblocks help.

Then ask: "Make me a GrowBlocks game where frogs race across lily pads", or use the make_game prompt.

Tools

Every tool takes dir, the game folder. Prompts: makegame, shipgame. Resources: llms.txt, gb.d.ts.

Money (collections, the coin, earnings) never goes through the assistant: it stays in your browser at growblocks.xyz. Developers keep 70% of the fees their game generates.

Layout

• .claude-plugin/marketplace.json: this repo as a Claude Code plugin marketplace
• plugins/growblocks/: the plugin (.mcp.json runs npx growblocks@1.2.0 mcp, pinned so every install runs the reviewed version, plus the growblocks-game skill)
• desktop/: the Claude Desktop extension; build it with npx @anthropic-ai/mcpb pack desktop growblocks.mcpb
• server.json: the entry for the official MCP Registry
• TERMS.md: the Dev Kit terms

The server is one dependency-free file, growblocks.mjs, published on npm as growblocks.