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 rampstackco/claude-skills-starter --skill seo-onpagegit clone --depth 1 https://github.com/rampstackco/claude-skills-starterWrote 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/rampstackco/claude-skills-starter/seo-onpage)<a href="https://agentmods.dev/skills/rampstackco/claude-skills-starter/seo-onpage"><img src="https://agentmods.dev/badge/skills/rampstackco/claude-skills-starter/seo-onpage/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/rampstackco/claude-skills-starter/seo-onpage"><img src="https://agentmods.dev/badge/skills/rampstackco/claude-skills-starter/seo-onpage.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 | $0.00161 | $0.01601 |
| Opus 5 | $0.00081 | $0.00800 |
| Sonnet 5 | $0.00032 | $0.00320 |
| Haiku 4.5 | $0.00016 | $0.00160 |
Grade A, and why
seo-onpage 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 10d 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
100% identical to seo-onpage — 0 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 — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
On-Page SEO
Optimize a single page for search relevance, click-through, and crawler comprehension. Stack-agnostic. Works on any CMS, framework, or static site.
When to use
- Auditing or optimizing a single page (homepage, product page, article, landing page)
- Writing or reviewing title tags and meta descriptions
- Fixing header structure or content hierarchy
- Reviewing internal links from or to a page
- Improving a page's CTR from search results
When NOT to use
- Site-wide crawl, indexing, or speed issues (use
seo-technical) - Keyword research or intent mapping (use
seo-keyword) - Competitor SERP analysis (use
seo-competitor) - Auditing many pages at once for prune/merge decisions (use
seo-content-audit)
Required inputs
- The page URL or the draft content if pre-launch
- The primary target query (one phrase the page should rank for)
- The page's role in the site (commercial, informational, navigational)
If the target query is unknown, run seo-keyword first or ask the user to name one.
The framework: 8 dimensions
A complete on-page audit covers eight dimensions. Score each as Pass, Needs work, or Fail. Note the specific fix.
1. Title tag
- One unique title per URL across the site
- Roughly 50 to 60 characters (longer gets truncated in SERPs)
- Primary query near the front
- Brand at the end if it earns inclusion
- Distinct from the H1 (often very similar, but should not be identical word-for-word)
2. Meta description
- One unique description per URL
- Roughly 150 to 160 characters
- Restates the value proposition, not the title
- Includes a soft CTA where natural
- Treats the description as ad copy that earns the click
3. Header structure
- Exactly one H1 per page
- H1 contains or paraphrases the primary query
- H2 sections cover the major sub-topics
- H3+ used only when an H2 has genuine sub-points
- No skipped levels (no H2 followed by H4)
- Headers describe sections accurately enough that a reader could navigate by them alone
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.
- 10d ago First seen · 151 lines · 161 tokens per session scan A 06e7759b2258
seo-onpage is a skill published in the GitHub repository rampstackco/claude-skills-starter (2 stars, last pushed 1mo ago), licensed MIT. It adds 161 tokens to every session and 1,601 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to seo-onpage, differing in 0 lines, and is treated as a copy.
Other skills, from other repositories
seo-content-audit
Audit existing content across a site to decide what to keep, update, merge, redirect, or delete. Use this skill whenever the user wants to audit existing content, fix content decay, resolve keyword cannibalization, prune underperforming pages, prioritize content updates, or apply a keep/update/merge/redirect/delete…
seo-aeo-geo
Optimize content and site structure for AI-driven search experiences including AI overviews, large language model citations, generative answer engines, and AI assistants. Use this skill whenever the user wants to optimize for AI search, get cited by language models, appear in AI overviews, build llms.txt, structure…
seo-keyword
Run keyword research, classify by search intent, cluster into topical groups, and prioritize for content production. Use this skill whenever the user asks to do keyword research, find target keywords, identify ranking opportunities, classify search intent, build a topical map, or plan a content strategy around what…
seo-offpage
Plan and execute off-page SEO including link building, digital PR, brand mentions, citation building, and external authority signals. Use this skill whenever the user wants to build backlinks, plan a digital PR campaign, list local citations, run guest post outreach, develop linkable assets, recover lost links, or…
seo-competitor
Run a competitive SEO analysis comparing the user's site to chosen competitors across SERP overlap, content depth, backlink profiles, technical posture, and brand presence. Use this skill whenever the user wants to analyze competitors, find content gaps, identify backlink opportunities, understand why competitors…
seo-onpage
Run a comprehensive on-page SEO audit or optimization pass covering title tags, meta descriptions, header structure, content quality, internal links, image optimization, URL hygiene, and on-page schema. Use this skill whenever the user asks to optimize a page, audit on-page SEO, fix titles or meta tags, review header…