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 alt-text-designgit 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/alt-text-design)<a href="https://agentmods.dev/skills/owl-listener/inclusive-design-skills/alt-text-design"><img src="https://agentmods.dev/badge/skills/owl-listener/inclusive-design-skills/alt-text-design/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/alt-text-design"><img src="https://agentmods.dev/badge/skills/owl-listener/inclusive-design-skills/alt-text-design.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 | $0.00077 | $0.00852 |
| Opus 5 | $0.00039 | $0.00426 |
| Sonnet 5 | $0.00015 | $0.00170 |
| Haiku 4.5 | $0.00008 | $0.00085 |
Grade A, and why
alt-text-design 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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Alt Text Design
Write alt text that conveys the same information and purpose as the visual content — not just what the image looks like, but what it communicates.
Core Principle
Alt text answers the question: if this image disappeared, what information would be lost? That's what needs to be in the alt text.
Decision Tree
1. Is the image purely decorative?
- Background textures, dividers, visual flourishes
- Images that repeat information already in adjacent text
- Action: use empty alt (alt="") so screen readers skip it
2. Is the image functional?
- A linked logo, an icon button, an image link
- Action: alt text describes the function, not the image
- Logo linking to homepage: alt="Company name — home"
- Search icon button: alt="Search"
- NOT alt="magnifying glass icon"
3. Is the image informative?
- Photos, illustrations, screenshots that add information
- Action: describe the information the image conveys
- Photo of a damaged product: alt="Crack running along the bottom edge of the screen"
- NOT alt="Photo of a phone" or alt="product-image-032.jpg"
4. Is the image complex?
- Charts, graphs, diagrams, infographics, maps
- Action: short alt text summarising the key message PLUS a longer description nearby (in the page text or a linked detail)
- Bar chart: alt="Bar chart showing sales growth — details below" followed by a text summary of the data
- NOT alt="bar chart" and not the entire data set in the alt attribute
Writing Good Alt Text
Be Specific
- Bad: "A group of people"
- Good: "Three team members reviewing a prototype on a whiteboard"
Convey Purpose, Not Just Appearance
- Bad: "Red circle with a number"
- Good: "3 unread notifications"
Match the Context
The same image needs different alt text in different contexts:
- On a recipe page: "Finished risotto in a white bowl, garnished with parmesan and basil"
- On a kitchenware product page: "Round white ceramic serving bowl, 22cm diameter"
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 · 98 lines · 77 tokens per session scan A 35ca6efa8fc6
alt-text-design is a skill published in the GitHub repository Owl-Listener/inclusive-design-skills (98 stars, last pushed 3mo ago), licensed MIT. It adds 77 tokens to every session and 852 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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