Once your project holds an app assembled with /app-builder, the natural next step is to show it in motion. That's exactly what /app-walkthrough does: it doesn't touch your screen designs — it takes whatever screens already exist and produces a short, narrated walkthrough video. Under the hood it screenshots each screen from the live preview, orders them by the app's navigation graph, an animated cursor taps the nav button, the screens crossfade one into the next, a single sentence is written and narrated for each, and the whole thing renders to an MP4 that lands on the canvas as a video card. In this guide we'll walk the full process, click by click.
What you'll need
- An app already assembled with /app-builder in the same project (at least one screen).
- Navigation wired between the screens so the cursor can step through them in order.
- A voiceover (TTS) provider configured in Settings if you want narration.
Step by step
- 1
Open the project with your App Builder screens
Open the project where your app lives. On the canvas you'll see the screen cards you assembled with /app-builder. /app-walkthrough only records what already exists — it never designs or edits screens.
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Check the screens with Preview
On any screen card click "Preview" and tap through the live device preview. Confirm the navigation (bottom bar, buttons, links) goes to the right screens — that navigation graph is exactly what orders the video.
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Run /app-walkthrough in chat
In the chat box type /app-walkthrough (or pick the skill from the menu). You can briefly add direction, e.g. "warm, friendly tone". You don't need to spell out steps — the skill knows the whole workflow.
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Let the app confirm there's something to record
The skill first calls list_app to check the screens. If it finds none it stops and tells you to build an app with /app-builder first. If screens exist, it continues.
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Pick a narration voice (optional)
If you didn't give a tone, the app may offer a style once — e.g. "Warm & friendly", "Crisp & professional" or "Skip narration / captions only". Choose one and it continues.
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Record the walkthrough
The app calls generate_walkthrough — in one step it screenshots each screen from the live preview, orders them by navigation, an animated cursor taps the nav button and the screens crossfade, and a single sentence is written and narrated for each. This is the terminal step; it runs once.
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Choose where to save the MP4
The app prompts you to pick a location for the finished .mp4. Pick a folder and confirm. If you cancel the dialog you get a "cancelled" error — just acknowledge it; the recording doesn't retry.
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- 8
Play the walkthrough on the canvas
The finished video lands on the canvas as a video card. Hit play and watch the tour of your app. The result includes its length (duration_sec) and how many screens it covered; you can add the card to the timeline or share it like any other video.
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What you get
You have a polished walkthrough video on the canvas that clicks through every screen of your app — with an animated cursor, crossfades and a one-line voiceover per screen — saved as an MP4 on your disk. It's the ideal way to show off an /app-builder prototype to clients, on social, or in an investor deck, without screen-recording by hand.
Pro tips
- generate_walkthrough is the terminal step — it runs once per run; don't call it repeatedly and don't run other tools after it.
- Leave captions off for a clean phone demo; turn them on only when the video will be watched muted.
- Richer screens = a better script: add real titles and content in /app-builder and the narration improves on its own.
Try it yourself
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