Dev Server

Start the project's dev server in the background and tell the user where to view it.

Steps

1. Detect the dev command — check package.json (or bun.lockb, etc.) for a dev script. Common commands:

   • bun run dev (Bun projects)
   • npm run dev / yarn dev / pnpm dev (Node projects)
   • Fall back to whatever start command the project uses

2. Start the server in the background using the Bash tool with run_in_background: true.

3. Detect the port — check in this order:

   • The command's output (read the background task output after a short moment)
   • CLAUDE.md or project docs mentioning a port
   • Common defaults: 3000, 5173 (Vite), 4321 (Astro), 8080

4. Display the URL — output the local URL plainly, e.g.: