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 oborchers/fractional-cto --skill accessibilitygit clone --depth 1 https://github.com/oborchers/fractional-ctoWrote 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/oborchers/fractional-cto/accessibility)<a href="https://agentmods.dev/skills/oborchers/fractional-cto/accessibility"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/accessibility/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/oborchers/fractional-cto/accessibility"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/accessibility.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 | $0.00069 | $0.00851 |
| Opus 5.5 | $0.00028 | $0.00340 |
| Sonnet 5.5 | $0.00014 | $0.00170 |
| Haiku 4.5 | $0.00007 | $0.00085 |
Grade A, and why
accessibility 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 5d 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 — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Accessibility Is Not a Feature — It Is a Legal Requirement
WCAG 2.2 Level AA is the target — not because it is aspirational, but because it is law. The ADA Title II final rule requires WCAG 2.1 AA compliance for government-facing software. The European Accessibility Act applies to any SaaS accessible to EU citizens. Over 4,000 accessibility lawsuits were filed in 2023 alone.
Minimum Standards
Color Contrast
- 4.5:1 for normal text
- 3:1 for large text (18pt+ or 14pt bold)
Keyboard Operability
Every interactive element must be operable by keyboard alone:
| Key | Action |
|---|---|
| Tab | Navigate between elements |
| Enter/Space | Activate element |
| Escape | Close modals, popovers, dropdowns — always |
| Arrow keys | Navigate within composite widgets |
Focus must always be visible. Many CSS resets strip :focus styles — this is a critical accessibility violation. Ensure every focusable element has a visible focus indicator.
SPA Accessibility
Single-page applications break three browser behaviors that most teams miss entirely. Traditional page loads reset focus, announce the new page title, and reset scroll position. SPAs break all three.
Mandatory SPA fixes:
- Move focus on route change — use
tabindex="-1"on the element receiving programmatic focus - Update the
<title>tag on every navigation - Announce route changes via ARIA live regions
- Restore focus on back-button navigation
When uncertain where to place focus after navigation, move it to the top of the page — it is always correct.
Use Accessible Component Primitives
Do not build modals, dialogs, or dropdown menus from scratch. The edge cases are vast and the failure modes are invisible to sighted developers.
Use libraries like Radix UI (the foundation of shadcn/ui) that handle ARIA attributes, focus management, and keyboard navigation internally.
Testing
Automated testing catches roughly 30% of accessibility issues. Manual testing catches the rest.
What ships with it
2 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.
- 5d ago First seen · 82 lines · 69 tokens per session scan A 5c4476cacf06
accessibility is a skill published in the GitHub repository oborchers/fractional-cto (32 stars, last pushed 5d ago), licensed MIT. It adds 69 tokens to every session and 851 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 2026-10-13.
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