Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add S3YED/appie-kit --skill scroll-scrub-videogit clone --depth 1 https://github.com/S3YED/appie-kitWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/s3yed/appie-kit/scroll-scrub-video)<a href="https://agentmods.dev/skills/s3yed/appie-kit/scroll-scrub-video"><img src="https://agentmods.dev/badge/skills/s3yed/appie-kit/scroll-scrub-video/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/s3yed/appie-kit/scroll-scrub-video"><img src="https://agentmods.dev/badge/skills/s3yed/appie-kit/scroll-scrub-video.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00058 | $0.02339 |
| Opus 5 | $0.00029 | $0.01170 |
| Sonnet 5 | $0.00012 | $0.00468 |
| Haiku 4.5 | $0.00006 | $0.00234 |
Grade A, and why
scroll-scrub-video scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
fetch(src, { cache: 'force-cache' }) How it starts
The opening of the file, as written. The whole thing — 207 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Scroll Scrub Video Hero
Build a scroll-driven video section where video.currentTime is driven by the user's scroll position. This is the technique Apple uses on product pages and is used on soleiman-advocatuur.vercel.app.
Two Modes (critical to get right)
Mode A: Fast scrub with overlay fade (Soleiman-style)
- Video finishes scrubbing after 1.5 viewport heights of scroll
- Content overlay/text fades out (5–25% scroll)
- Remaining scroll in the hero section shows the last video frame
- Used for: storytelling where the video is a backdrop that transitions to content below
- Hero height: 250vh | Scrub distance: 150vh | Fade: yes
Mode B: Chronological full-section scrub
- Video scrubs from start to end across the entire hero section (e.g., 240vh)
- Content overlay stays visible throughout
- When the user finishes scrolling the hero, the video is at the final frame
- Used for: product transformations, "before → after" reveals, where the video IS the content
- Hero height: 340vh | Scrub distance: 240vh | Fade: no
Always confirm with the user which mode they want before building. Default to Mode B for transformation/reveal content.
Video Encoding
The video MUST be encoded with every frame as a keyframe (-g 1) for instant seeking. Standard video files have keyframes every ~250 frames, causing visible stutter when scrubbing.
# Production scrub video — 720p, 24fps, every frame a keyframe
ffmpeg -i source.mp4 \
-c:v libx264 -g 1 -crf 26 -preset medium \
-pix_fmt yuv420p -movflags +faststart -an \
-vf "scale=1280:720:flags=lanczos,fps=24" \
scrub.mp4
Video spec (proven):
- Resolution: 1280x720
- Framerate: 24fps
- Codec: H.264,
-g 1(every frame keyframe) - Bitrate: ~6 Mbps
- File size: ~5 MB for 7 seconds
- No audio (
-an)
Why these specs: The Soleiman reference video (lady-justice-scrub.mp4) is 1280x714 @ 24fps, 6MB. Higher resolution or FPS increases file size without visible benefit (the video is a background element). 24fps = fewer frames to seek through = smoother scrub.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 207 lines · 58 tokens per session scan A a591d2f5f70d
scroll-scrub-video is a skill published in the GitHub repository S3YED/appie-kit (8 stars, last pushed 13d ago), licensed MIT. It adds 58 tokens to every session and 2,339 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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