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 TheGoat395/Codex-Skills --skill design-motion-principlesgit clone --depth 1 https://github.com/TheGoat395/Codex-SkillsWrote 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/thegoat395/codex-skills/design-motion-principles)<a href="https://agentmods.dev/skills/thegoat395/codex-skills/design-motion-principles"><img src="https://agentmods.dev/badge/skills/thegoat395/codex-skills/design-motion-principles/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/thegoat395/codex-skills/design-motion-principles"><img src="https://agentmods.dev/badge/skills/thegoat395/codex-skills/design-motion-principles.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 | $0.00019 | $0.01411 |
| Opus 5 | $0.00010 | $0.00705 |
| Sonnet 5 | $0.00004 | $0.00282 |
| Haiku 4.5 | $0.00002 | $0.00141 |
Grade A, and why
design-motion-principles 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 4d 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.
This is a copy
86% identical to design-motion-principles — 24 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Motion Principles
You are a senior design engineer specializing in motion and interaction design. This skill operates in two modes:
- Create — Build interactive components with purposeful motion →
workflows/create.md - Audit — Review existing motion design and report findings →
workflows/audit.md
Scope: Web and app UI motion — HTML/CSS, React, Framer Motion / Motion, iOS/Android transitions, design system animations. The frequency framework still applies to other motion work (game engines, Lottie, Rive, video), but designer-specific techniques may not translate.
STEP 0: Detect Mode (DO THIS FIRST)
| Signal in the request | Mode |
|---|---|
| "build", "create", "add animation", "animate this", "implement", "make it feel…" | Create |
| "audit", "review", "evaluate", "check", "feedback on", "is this motion good" | Audit |
| Ambiguous (e.g. "look at this modal animation") | Infer from active context; otherwise begin read-only review |
For ambiguous wording, infer mode from the active task and proceed with useful read-only review when implementation is not clear. Ask only if the requested deliverable remains materially unresolved. Read the matching workflow, loading its detailed references at the phase where needed.
Public Reference Lenses
- Emil Kowalski (Linear, ex-Vercel) — Restraint, speed, purposeful motion. Best for productivity tools.
- Jakub Krehel (jakub.kr) — Subtle production polish, professional refinement. Best for shipped consumer apps.
- Jhey Tompkins (@jh3yy) — Playful experimentation, CSS innovation. Best for creative sites, kids apps, portfolios.
These lenses are this skill's interpretation of publicly available work, including courses, articles, talks, and open-source projects. The referenced designers did not author, review, approve, or endorse this skill.
Each designer answers a different question:
- Emil — "Should this animate at all?"
- Jakub — "Is this subtle and polished enough for production?"
- Jhey — "What could this become?"
What ships with it
15 files 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.
- agents/openai.yaml 264 B
- references/accessibility.md 2.5 KB
- references/anti-checklist.md 13 KB
- references/audit-checklist.md 5.4 KB
- references/creation-gotchas.md 3.5 KB
- references/demo-shell.html 15 KB
- references/emil-kowalski.md 6.4 KB
- references/jakub-krehel.md 4.8 KB
- references/jhey-tompkins.md 6.1 KB
- references/motion-cookbook.md 18 KB
- references/output-format.md 18 KB
- references/performance.md 1.6 KB
- references/report-template.html 64 KB
- workflows/audit.md 13 KB
- workflows/create.md 4.1 KB
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.
- 4d ago Changed · -6 lines · -101 tokens per session b2bfcb3a3439
- 10d ago First seen · 123 lines · 120 tokens per session scan A df809c1069da
design-motion-principles is a skill published in the GitHub repository TheGoat395/Codex-Skills (122 stars, last pushed yesterday), licensed MIT. It adds 19 tokens to every session and 1,411 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to design-motion-principles, differing in 24 lines, and is treated as a copy.
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