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 mayank-io/mstack --skill motion-designgit clone --depth 1 https://github.com/mayank-io/mstackWrote 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/mayank-io/mstack/motion-design)<a href="https://agentmods.dev/skills/mayank-io/mstack/motion-design"><img src="https://agentmods.dev/badge/skills/mayank-io/mstack/motion-design/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/mayank-io/mstack/motion-design"><img src="https://agentmods.dev/badge/skills/mayank-io/mstack/motion-design.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 | $0.00135 | $0.02460 |
| Opus 5.5 | $0.00054 | $0.00984 |
| Sonnet 5.5 | $0.00027 | $0.00492 |
| Haiku 4.5 | $0.00014 | $0.00246 |
Grade A, and why
motion-design scanned grade A with 0 findings 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 19d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Motion Design — Explainer Studio
1. Goal
Turn the topic into a finished explainer film that leaves the audience with one new understanding in the requested seconds. The deliverable is a rendered video with sound and captions, plus the source that renders it. A plan, a moodboard or a still frame is not the deliverable.
You are the whole studio: creative director, explainer writer, motion designer, sound designer and render engineer. When the brief is thin, make the call, log it in one line in DECISIONS.md, and keep moving.
2. Inputs
Gather these from the user's message. Ask once, in a single message, only for what is missing and changes the goal — the topic is the only hard requirement. Default the rest and log each default in DECISIONS.md.
| Input | Default when absent |
|---|---|
| Topic | — (ask) |
| Audience, and what they already believe | Smart generalist new to the topic; infer the common misconception |
| After watching they can… | One sentence derived from the topic |
| Length | 60 s (allowed 30–90) |
| Brand and references | ./brand, ./refs, ./screens if present; otherwise derive tokens from the product/repo being explained and log that |
Work in a project folder explainers/<slug>/ under the current directory (or the folder the user names). Layout:
explainers/<slug>/
├── brand/ refs/ screens/ # inputs (copied or symlinked if they live elsewhere)
├── DECISIONS.md SOURCES.md README.md
├── tokens.json # palette, type, spacing, easing, grid
├── directions.html # 3–4 directions side by side + decision log
├── storyboard/contact.png # contact sheet, one still per beat
├── src/index.html # the film: TIMELINE + window.seek(t)
├── src/audio.js # procedural bed + cues, OfflineAudioContext
├── scripts/render.mjs # headless Chrome → ffmpeg
├── captions.srt
└── out/
Preflight. Before any creative work, confirm the toolchain: ffmpeg -version, and a headless Chrome reachable from Node (npx playwright --version or Puppeteer). If either is missing, say exactly what to install and stop — do not plan a film you cannot render.
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.
- 19d ago First seen · 170 lines · 135 tokens per session scan A 9605ac548ee0
motion-design is a skill published in the GitHub repository mayank-io/mstack (6 stars, last pushed 3d ago), licensed MIT. It adds 135 tokens to every session and 2,460 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-13.
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