Borrowing it
Nothing to install: this file belongs to DanielPodolsky/ownyourcode. 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/DanielPodolsky/ownyourcode/main/.claude/skills/fundamentals/seo/SKILL.mdgit clone --depth 1 https://github.com/DanielPodolsky/ownyourcodeWrote 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/danielpodolsky/ownyourcode/seo)<a href="https://agentmods.dev/skills/danielpodolsky/ownyourcode/seo"><img src="https://agentmods.dev/badge/skills/danielpodolsky/ownyourcode/seo/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/danielpodolsky/ownyourcode/seo"><img src="https://agentmods.dev/badge/skills/danielpodolsky/ownyourcode/seo.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 | $0.00038 | $0.01412 |
| Opus 5.5 | $0.00015 | $0.00565 |
| Sonnet 5.5 | $0.00008 | $0.00282 |
| Haiku 4.5 | $0.00004 | $0.00141 |
Grade A, and why
seo-fundamentals 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.
How it starts
The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SEO Fundamentals Review
"Good SEO is good UX. If search engines can't understand your page, users might not find it."
When to Apply
Activate this skill when:
- Reviewing HTML
<head>sections - Seeing meta tags in code
- Next.js/Remix page components
- HTML structure with headings
- Any page that should be indexed
The SEO Checklist
Must Have (Every Page)
- Title tag — 50-60 characters, unique per page
- Meta description — 150-160 characters, compelling
- Single H1 — One per page, describes main content
- Logical heading hierarchy — H1 → H2 → H3 (no skipping)
- Semantic HTML —
<header>,<main>,<nav>,<article>,<footer> - Image alt text — Descriptive, not "image1.jpg"
Should Have (Marketing Pages)
- Open Graph tags — og:title, og:description, og:image
- Twitter Card — twitter:card, twitter:title
- Canonical URL — Prevent duplicate content issues
- Structured data — JSON-LD for rich snippets
Performance (Affects SEO)
- Core Web Vitals awareness
- LCP (Largest Contentful Paint) < 2.5s
- FID (First Input Delay) < 100ms
- CLS (Cumulative Layout Shift) < 0.1
Common Mistakes (Anti-Patterns)
1. Multiple H1 Tags
<!-- ❌ BAD: Multiple H1s confuse search engines -->
<h1>Welcome</h1>
<h1>Our Products</h1>
<h1>Contact Us</h1>
<!-- ✅ GOOD: One H1, logical hierarchy -->
<h1>Welcome to Our Store</h1>
<h2>Our Products</h2>
<h2>Contact Us</h2>
2. Missing Alt Text
<!-- ❌ BAD: Empty or useless alt -->
<img src="hero.jpg" alt="">
<img src="team.jpg" alt="image">
<!-- ✅ GOOD: Descriptive alt text -->
<img src="hero.jpg" alt="Software engineer working at laptop">
<img src="team.jpg" alt="Our founding team of 5 engineers">
3. Div Soup (No Semantic HTML)
<!-- ❌ BAD: No semantic meaning -->
<div class="header">
<div class="nav">...</div>
</div>
<div class="content">...</div>
<div class="footer">...</div>
<!-- ✅ GOOD: Semantic HTML -->
<header>
<nav>...</nav>
</header>
<main>...</main>
<footer>...</footer>
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 First seen · 220 lines · 38 tokens per session scan A 216a3c9e7e9d
seo-fundamentals is a skill published in the GitHub repository DanielPodolsky/ownyourcode (292 stars, last pushed 4mo ago), licensed MIT. It adds 38 tokens to every session and 1,412 once invoked, about $0.0002 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 2026-08-30.
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