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code-video

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Make short videos and animations with code: ask what the user wants, fill in a block prompt for this request (you fill the tags; the look is only a recommendation), then write the code, render every frame to MP4, check sampled frames and deliver. Gives a path that works plus rendering, contact-sheet and check tools; what to draw and how is yours to design. Use when the user asks to make a video or animation with code, a pixel-art / hand-drawn / 3D animation, a motion piece for a product, or a short history / explainer animation.

skills/code-video/SKILL.md

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# Code Video

Draw a good-looking short video in code. What follows is a path that works, not a fixed procedure; what to draw, which technique, the look and the motion are yours to design for this request.

## Language

Talk to the user in the language of their first message and keep it for the whole session. Write the prompt blocks in that language too; the tag names stay in English. The seven examples are the Chinese originals that were actually run: learn their structure and level of detail, don't translate them word for word.

## The rough path

1. **Ask**: where it's used, who watches, what to show, what viewers should remember, the look, size and length, anything to avoid. Don't re-ask what the user said; use what you can infer; default what's missing (landscape 1920×1080, 30 fps, 8–15 s), and use all defaults if they say "you decide". Use a question tool if you have one, in one round
2. **Fill the prompt**: fill the tags below for this request, save it as `prompt.md` in the project folder, and show the user (skip if they say "just do it")
3. **Follow it**: write the code, check a few stills, render the full video, look at the contact sheet, fix until it's right. If the first version shows habits you don't want, add them to `prompt.md` and fix
4. **Deliver**: the project folder keeps `video.mp4`, `check/contact-sheet.png`, `prompt.md`, `index.html`, `video.json`, `package.json` (change one thing, `npm i`, re-render); delete `node_modules` and intermediate frames. Report how long it took and what the self-check fixed
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