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 joshuadavidthomas/agent-skills --skill frontend-design-principlesgit clone --depth 1 https://github.com/joshuadavidthomas/agent-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/joshuadavidthomas/agent-skills/frontend-design-principles)<a href="https://agentmods.dev/skills/joshuadavidthomas/agent-skills/frontend-design-principles"><img src="https://agentmods.dev/badge/skills/joshuadavidthomas/agent-skills/frontend-design-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/joshuadavidthomas/agent-skills/frontend-design-principles"><img src="https://agentmods.dev/badge/skills/joshuadavidthomas/agent-skills/frontend-design-principles.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00079 | $0.01615 |
| Opus 5 | $0.00039 | $0.00807 |
| Sonnet 5 | $0.00016 | $0.00323 |
| Haiku 4.5 | $0.00008 | $0.00161 |
Grade A, and why
frontend-design-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 12d 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 — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend Design Principles
Build frontend interfaces with craft and intention.
Scope & Routing
After this file, load the context-specific guide:
app.md— dashboards, admin and settings panels, internal tools, SaaS products, data-heavy interfaces (tables, forms, lists), anything users work in repeatedly.marketing.md— landing pages, marketing sites, announcements, creative artifacts, anything where first impression matters most.
If unclear, ask. Blended projects need both: a SaaS marketing site uses marketing.md; its product dashboard uses app.md.
Why This Process Exists
You default to generic output — training patterns for dashboards and landing pages are strong. The process below helps, but process alone isn't craft: you have to catch yourself.
Where Defaults Hide
Defaults disguise themselves as infrastructure — the parts that feel like they just need to work, not be designed. There are no structural decisions. Everything is design.
- Typography isn't a container — it IS the design. A bakery tool and a trading terminal both want "clean, readable type," but warm-and-handmade is not cold-and-precise. Reaching for your usual font means you're not designing.
- Navigation isn't around the product — it IS the product. Where you are, where you can go, what matters most. A page floating in space is a component demo, not software.
- Data isn't presentation — it's meaning. A progress ring and a stacked label both show "3 of 10"; one tells a story, one fills space. Ask what the number means to the person looking at it.
- Token names are design decisions, not implementation detail. Someone reading only your CSS variables should be able to guess the product:
/* ❌ generic — could be any project */
--gray-700: …; --surface-2: …;
/* ✅ domain — evokes this product's world */
--ink: …; --parchment: …;
Required: Before Generating
Do not write code until these are done.
1. Answer the intent questions
Answer with specifics or ask the user — do not guess, do not default:
What ships with it
3 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.
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.
- 12d ago First seen · 118 lines · 79 tokens per session scan A e870439c3787
frontend-design-principles is a skill published in the GitHub repository joshuadavidthomas/agent-skills (49 stars, last pushed 1mo ago), licensed MIT. It adds 79 tokens to every session and 1,615 once invoked, about $0.0004 per session on Opus 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 2026-08-30.
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