Marketing Skills is an open-source library of reusable workflows that helps AI coding agents perform marketing and SEO tasks. It serves people working on search optimization, content, advertising, launches, analytics, and related marketing activities, and its catalogue entries are the individual skills agents can install.
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 kostja94/marketing-skills --skill mobile-friendlygit clone --depth 1 https://github.com/kostja94/marketing-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/kostja94/marketing-skills/mobile-friendly)<a href="https://agentmods.dev/skills/kostja94/marketing-skills/mobile-friendly"><img src="https://agentmods.dev/badge/skills/kostja94/marketing-skills/mobile-friendly/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/kostja94/marketing-skills/mobile-friendly"><img src="https://agentmods.dev/badge/skills/kostja94/marketing-skills/mobile-friendly.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00081 | $0.01412 |
| Opus 5.5 | $0.00032 | $0.00565 |
| Sonnet 5.5 | $0.00016 | $0.00282 |
| Haiku 4.5 | $0.00008 | $0.00141 |
Grade A, and why
mobile-friendly 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 1mo 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.
Copies of this mod
3 near-identical copies found in the catalogue:
- mobile-friendly — 100% identical, 4 lines differ
- mobile-friendly — 100% identical, 2 lines differ
- mobile-friendly — 100% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SEO Technical: Mobile-Friendly
Guides mobile-first indexing optimization and mobile usability. Google uses the mobile version of pages for indexing and ranking; mobile-friendliness is a ranking factor.
When invoking: On first use, if helpful, open with 1–2 sentences on what this skill covers and why it matters, then provide the main output. On subsequent use or when the user asks to skip, go directly to the main output.
Scope (Technical SEO)
- Mobile-first indexing: Google primarily crawls and indexes mobile version
- Mobile adaptation: Responsive design, viewport, breakpoints
- Content parity: Mobile and desktop content should match (or mobile preferred)
- Mobile usability: Viewport, font size, touch targets, no intrusive interstitials
- AMP: Accelerated Mobile Pages—status and when to consider
Initial Assessment
Project context: Read root contextus.md when present and load only the modules relevant to this task. Without Contextus, use available project material or user-provided facts and ask for missing information; do not create a parallel context system.
Identify:
- Site type: Responsive, separate AMP, dynamic serving
- Content parity: Does mobile show same content as desktop?
- Tools: GSC Mobile Usability report; Mobile-Friendly Test
Mobile-First Indexing Requirements
| Requirement | Action |
|---|---|
| Content parity | Mobile version must include same primary content as desktop; avoid hiding key content on mobile |
| Structured data | Same schema on mobile and desktop; ensure mobile URLs in schema |
| Metadata | Same title, meta description on mobile |
| Media | Images should be crawlable; avoid lazy-loading above-fold images |
Responsive Design & Mobile Adaptation
Responsive design = Single HTML; CSS media queries adapt layout to screen size. Preferred for SEO: one URL, no duplicate content.
| Principle | Practice |
|---|---|
| Mobile-first | Design for mobile first; enhance for desktop |
| Fluid layout | Use %, vw, flex, grid; avoid fixed pixel widths |
| Breakpoints | Common: 320px, 768px, 1024px, 1280px; match device widths |
| Images | Responsive images (srcset, sizes); see image-optimization |
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.
- 1mo ago Changed 078f034ec9c7
- 1mo ago First seen · 124 lines · 81 tokens per session scan A 6e0b7ed5547c
mobile-friendly is a skill published in the GitHub repository kostja94/marketing-skills (1,064 stars, last pushed yesterday), licensed MIT. It adds 81 tokens to every session and 1,412 once invoked, about $0.0003 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 2026-09-03.
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