Saturn MCP

Build, edit and deploy real apps from inside any MCP-aware agent — Cursor, Claude Desktop, Windsurf, or your own. Saturn becomes a tool your agent can call:

| Tool | What it does | |------|--------------| | create_app | Build a new web or mobile app from a prompt → returns live preview + editor URL | | edit_app | Send a change request to an existing project | | get_status | Status, preview URL, publish URL, latest build | | get_preview | Just the instant CDN preview URL | | deploy_app | Publish to a live URL (Vercel) | | list_projects | List projects in your workspace |

The first AI app-builder available as an MCP server. Your agent ships products, not snippets.

1. Get an API key

Create a workspace API key at https://thesaturn.dev/settings/developers → "API keys". It looks like saturn_sk_…. Keep it secret.

2. Add the server

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json (macOS) / %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "saturn": {
      "command": "npx",
      "args": ["-y", "saturn-mcp"],
      "env": {
        "SATURN_API_KEY": "saturn_sk_your_key_here"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json (or Settings → MCP → Add new server):

{
  "mcpServers": {
    "saturn": {
      "command": "npx",
      "args": ["-y", "saturn-mcp"],
      "env": { "SATURN_API_KEY": "saturn_sk_your_key_here" }
    }
  }
}

Restart the app. You should see the saturn tools appear.

3. Use it

"Use saturn to build a landing page for my coffee subscription with a hero, pricing and a waitlist form, then give me the preview link."

The agent calls create_app, you get a live preview URL in seconds, and an editor link to keep iterating.

Configuration

| Env var | Default | Notes | |---------|---------|-------| | SATURN_API_KEY | (required) | Workspace key, saturn_sk_… | | SATURN_API_URL | https://thesaturn.dev | Self-hosted / staging override |

Notes

• Builds run asynchronously. create_app/edit_app accept wait: true to block until done (~up to 4 min), otherwise poll with get_status.
• kind is web by default (instant static preview); pass mobile for a native Expo app.
• Everything is scoped to the workspace the key belongs to.

Docs: https://thesaturn.dev/docs/mcp · License: MIT