Borrowing it
Nothing to install: this file belongs to YankielDBC2/codex-skills-library. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/YankielDBC2/codex-skills-library/main/.agents/skills/mobile-density-ui-system-v2/SKILL.mdgit clone --depth 1 https://github.com/YankielDBC2/codex-skills-libraryWrote 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/yankieldbc2/codex-skills-library/mobile-density-ui-system-v2)<a href="https://agentmods.dev/skills/yankieldbc2/codex-skills-library/mobile-density-ui-system-v2"><img src="https://agentmods.dev/badge/skills/yankieldbc2/codex-skills-library/mobile-density-ui-system-v2/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/yankieldbc2/codex-skills-library/mobile-density-ui-system-v2"><img src="https://agentmods.dev/badge/skills/yankieldbc2/codex-skills-library/mobile-density-ui-system-v2.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 | $0.00037 | $0.00430 |
| Opus 5.5 | $0.00015 | $0.00172 |
| Sonnet 5.5 | $0.00007 | $0.00086 |
| Haiku 4.5 | $0.00004 | $0.00043 |
Grade A, and why
mobile-density-ui-system-v2 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 2mo 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.
What it actually says
Mobile Density UI System v2
Goal
Make mobile layouts compact, scannable, and conversion-friendly without sacrificing readability or touch comfort.
When to use
Use when mobile pages feel too tall, cards are oversized, every section becomes one column, product/service grids create too much scroll, or important content is buried.
Workflow
- Inspect the real content types: products, services, thumbnails, stats, categories, testimonials, CTAs, or form blocks.
- Decide whether each mobile section needs one column, two columns, horizontal scroll, compact cards, accordions, or progressive disclosure.
- Use two-column mobile grids for small product/service/category cards when content and tap targets remain readable.
- Reduce oversized headings, py-20/py-24 spacing, huge images, and card padding that create unnecessary scroll.
- Keep primary CTAs visible and avoid burying purchase or contact actions below decorative content.
- Use CSS grid, flex, container queries, or project utilities according to the existing style system.
- Test breakpoints around 360, 390, 430, 768, 1024, and desktop when possible.
Quality bar
- Check responsive behavior in browser/devtools or by inspecting CSS classes and breakpoints.
- Run available lint/type/build checks.
- Confirm no horizontal overflow or clipped content.
Validation
- Mobile shows more useful content per screen without feeling cramped.
- Tap targets remain usable and text remains readable.
- Two-column mobile grids are used where they improve browsing, not everywhere blindly.
- Hero and section heights are proportional to content.
Final response
- Report mobile density choices and any breakpoints manually verified.
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.
- 2mo ago First seen · 52 lines · 37 tokens per session scan A 8be978a93765
mobile-density-ui-system-v2 is a skill published in the GitHub repository YankielDBC2/codex-skills-library (13 stars, last pushed 3mo ago), licensed MIT. It adds 37 tokens to every session and 430 once invoked, about $0.0001 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 2026-08-31.
mobile-density-ui-system-v2 compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mobile-density-ui-system-v2YankielDBC2/codex-skills-library | Skill | 13 | 3mo ago | MIT | A | 37 | Claude Code, Codex |
| frontend-designNickCrew/Claude-Cortex | Skill | 66 | 4mo ago | MIT | A | 70 | Claude Code, Codex |
| responsive-storefrontfinsilabs/awesome-ecommerce-skills | Skill | 63 | 14d ago | MIT | A | 29 | Claude Code, Codex |
| better-layoutoyi77/1ai-skills | Skill | 17 | yesterday | MIT | A | 29 | Claude Code |
| Responsive Layout ReviewerNotysoty/openagentskills | Skill | 9 | 2mo ago | MIT | A | 25 | Claude Code, Codex |
| mobile-nativeemilkowalski/skills | Skill | 54k | 2d ago | MIT | A | 167 | Claude Code, Codex |
| uniwinduni-stack/uniwind | Skill | 1.7k | yesterday | MIT | A | 130 | Claude Code, Codex |