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 AmadeusITGroup/otter --skill a11y-aria-patternsgit clone --depth 1 https://github.com/AmadeusITGroup/otterWrote 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/amadeusitgroup/otter/a11y-aria-patterns)<a href="https://agentmods.dev/skills/amadeusitgroup/otter/a11y-aria-patterns"><img src="https://agentmods.dev/badge/skills/amadeusitgroup/otter/a11y-aria-patterns/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/amadeusitgroup/otter/a11y-aria-patterns"><img src="https://agentmods.dev/badge/skills/amadeusitgroup/otter/a11y-aria-patterns.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 | $0.00037 | $0.00923 |
| Opus 5.5 | $0.00015 | $0.00369 |
| Sonnet 5.5 | $0.00007 | $0.00185 |
| Haiku 4.5 | $0.00004 | $0.00092 |
Grade A, and why
a11y-aria-patterns 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 — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: ARIA Patterns Reference
Provide ARIA role patterns and mandatory behaviors for common UI primitives, and flag forbidden anti-patterns. This skill is a reference and review gate — it does not run automated checks.
ARIA Patterns for Common UI Primitives
| Primitive | Pattern | Mandatory behaviors |
|---|---|---|
| Button (icon-only) | <button> with aria-label |
Descriptive label; no title as accessible name — hover-only, unreachable by keyboard and touch |
| Toggle / switch | role="switch" |
aria-checked; keyboard: Space toggles |
| Disclosure / accordion | <button aria-expanded> controlling region |
aria-controls; Enter/Space toggles; region has id |
| Tabs | role="tablist" + role="tab" + role="tabpanel" |
aria-selected; arrow keys navigate tabs; Tab moves into panel |
| Modal / dialog | role="dialog" + aria-modal="true" |
Focus trap; aria-labelledby; Escape closes; focus restored on close; apply inert on background content (aria-modal="true" alone is not honored by all browsers) |
| Tooltip | role="tooltip" + aria-describedby |
Appears on focus AND hover; not the only accessible name |
| Menu / dropdown | role="menu" + role="menuitem" |
Arrow keys navigate; Escape closes; Enter/Space activates |
| Combobox / autocomplete | role="combobox" + role="listbox" |
aria-expanded; aria-activedescendant; arrow keys move selection |
| Date picker | Dialog containing role="grid" |
Focus trap; Escape closes; arrow keys move date; aria-current="date" for today |
| Table / data grid | <table> or role="grid" |
Column/row headers (scope or aria-label); aria-sort on sortable headers |
| Alert / toast | role="alert" (error) or role="status" (info) |
Not added to DOM before needed; auto-dismiss disabled when action present; minimum 5 s display |
| Form validation error | role="alert" or aria-live="polite" on error container |
Invalid control has aria-invalid="true" + aria-describedby pointing to the error message |
| Loading / skeleton | aria-busy="true" on region |
Live-region announces completion only when meaningful to the user |
| Progress bar | role="progressbar" |
aria-valuenow, aria-valuemin, aria-valuemax; label via aria-label or aria-labelledby |
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 · 50 lines · 37 tokens per session scan A bb19ca6621cf
a11y-aria-patterns is a skill published in the GitHub repository AmadeusITGroup/otter (59 stars, last pushed today), licensed BSD-3-Clause. It adds 37 tokens to every session and 923 once invoked, about $0.0001 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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