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The /preview command manages your local development server. Use it to start, stop, restart, or check the status of your preview environment.
Sub-commands /preview # Show current status /preview start # Start server /preview stop # Stop server /preview restart # Restart server /preview check # Health check
When to use this
Local testing Test changes in browser before committing
Iterative development Restart after major changes
Port conflicts Resolve port issues
Status checks Verify server is running
Usage examples Start server Response: 🚀 Starting preview... Port: 3000 Type: Next.js ✅ Preview ready! URL: http://localhost:3000
Status check Response: === Preview Status === 🌐 URL: http://localhost:3000 📁 Project: C:/projects/my-app 🏷️ Type: nextjs 💚 Health: OK
Port conflict If the default port is already in use:
Response: ⚠️ Port 3000 is in use. Options: 1. Start on port 3001 2. Close app on 3000 3. Specify different port Which one? (default: 1)
How it works The preview system uses the auto_preview.py script to:
Detect framework : Automatically identifies Next.js, React, Vue, etc.Start dev server : Runs the appropriate command (npm run dev, etc.)Monitor health : Checks if server is respondingHandle conflicts : Resolves port conflicts automatically
Technical details Under the hood, the preview system runs:
# Start preview on default or specific port python .agent/scripts/auto_preview.py start [port] # Stop running preview python .agent/scripts/auto_preview.py stop # Check status python .agent/scripts/auto_preview.py status
Common scenarios After making changes Most changes hot-reload automatically. For major changes (like configuration), restart:
Multiple projects Each project can run on a different port. Specify the port:
/preview start --port 3001
Stopping preview Stop the server when you’re done:
/create - Creates app and starts preview automatically/enhance - Updates preview after changes/deploy - Deploy after testing locally/status - Check overall project status 