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 Owl-Listener/inclusive-design-skills --skill heading-structuregit clone --depth 1 https://github.com/Owl-Listener/inclusive-design-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/owl-listener/inclusive-design-skills/heading-structure)<a href="https://agentmods.dev/skills/owl-listener/inclusive-design-skills/heading-structure"><img src="https://agentmods.dev/badge/skills/owl-listener/inclusive-design-skills/heading-structure/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/owl-listener/inclusive-design-skills/heading-structure"><img src="https://agentmods.dev/badge/skills/owl-listener/inclusive-design-skills/heading-structure.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 | $0.00074 | $0.00761 |
| Opus 5 | $0.00037 | $0.00380 |
| Sonnet 5 | $0.00015 | $0.00152 |
| Haiku 4.5 | $0.00007 | $0.00076 |
Grade A, and why
heading-structure 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 — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Heading Structure
Headings are navigation for screen reader users and cognitive signposts for everyone. A clear heading structure is the difference between content people can find and content people abandon.
Why This Matters
Screen reader users navigate by headings — they press a key to jump between headings the way sighted users scan a page visually. If your heading structure is broken, screen reader users are lost in a wall of undifferentiated text.
For people with cognitive disabilities, headings are the primary way they understand what content a page contains and where to find what they need.
Rules
One H1 Per Page
- The H1 is the page title — what this page is about
- It should match or closely relate to the page's title tag and the link that brought the user here
- Never use more than one H1 on a page
No Skipped Levels
- Go H1 → H2 → H3, never H1 → H3
- Skipping levels breaks screen reader navigation and confuses the document outline
- You can go back up: H3 → H2 is fine (starting a new section)
Headings Describe Content
- Headings are signposts, not decoration
- "Your Account Settings" not "Section 2"
- "Choose a Delivery Date" not "Step 3"
- A user should understand the page's content by reading only the headings
Headings Are Not Visual Styling
- Don't use a heading tag just to make text big or bold
- Don't skip heading tags and just style text to look like a heading
- The tag determines the structure; CSS determines the appearance
- If it looks like a heading but isn't one, screen reader users can't find it
Recommended Depth
- Most pages: H1 through H3 is sufficient
- Complex pages: H1 through H4 maximum
- If you need H5 or H6: the page is probably too complex — consider splitting it
Patterns
Article or Blog Post
H1: Article Title
H2: First Major Section
H3: Subsection
H3: Subsection
H2: Second Major Section
H3: Subsection
H2: Conclusion
Dashboard
H1: Dashboard Name
H2: Summary / Key Metrics
H2: Recent Activity
H2: Tasks
H2: Notifications
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 · 106 lines · 74 tokens per session scan A a26e74b21e91
heading-structure is a skill published in the GitHub repository Owl-Listener/inclusive-design-skills (98 stars, last pushed 3mo ago), licensed MIT. It adds 74 tokens to every session and 761 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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