Preview

Build a mini-app to fulfill the request. Use the apps/ directory and API.openApp(appId, { target: 'tab', title: 'Readable preview title' }) as documented in the Application Environment section.

Workflow

1. Scaffold — create apps/{appId}/index.html (+ optional styles.css, script.js).
2. Design for a full browser tab — the preview opens on an internal stagewise://internal/preview/{appId} page, so use responsive layouts that work from narrow to full-width viewports.
3. Open in tab — call await API.openApp(appId, { target: 'tab', title: 'Readable preview title' }). The title is shown in the tab breadcrumbs. The returned { tabId } can be used with API.sendCDP() if the preview needs inspection.
4. Iterate — use file tools (multiEdit, overwriteFile) for edits, then call API.openApp(appId, { target: 'tab', title: 'Readable preview title' }) again to open the refreshed preview.

Rules

• One index.html per app. Sibling assets resolve via relative paths (./styles.css).
• Prefer self-contained HTML (inline or sibling files) — no external build step.
• Do not open preview apps in the chat. Use target: 'tab'.
• Use API.sendMessage / API.onMessage only when bidirectional communication is needed.