What is accessibility?

A set of rules for making visible user interfaces usable by people with disabilities. It covers standards for screen readers, keyboard use, labels, headings, focus indicators, and color contrast.

Use it when creating or changing web interface elements, reviewing HTML, adding interactions, or investigating a drop in accessibility scores.

It helps prevent interfaces that are difficult to navigate or understand, including pages with inaccessible controls or missing image descriptions.

How holger1411/astrodeck configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to holger1411/astrodeck. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/holger1411/astrodeck/main/.claude/skills/accessibility/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/holger1411/astrodeck

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/holger1411/astrodeck/accessibility/github.svg)](https://agentmods.dev/skills/holger1411/astrodeck/accessibility)

Your own site

<a href="https://agentmods.dev/skills/holger1411/astrodeck/accessibility"><img src="https://agentmods.dev/badge/skills/holger1411/astrodeck/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/holger1411/astrodeck/accessibility"><img src="https://agentmods.dev/badge/skills/holger1411/astrodeck/accessibility.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 429 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 23
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00033	$0.00429
Opus 5.5	$0.00013	$0.00172
Sonnet 5.5	$0.00007	$0.00086
Haiku 4.5	$0.00003	$0.00043

Measured 2mo ago against content hash 080a3c3daa9c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo 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.

.claude/skills/accessibility/SKILL.md · 39 lines

What it actually says

Accessibility Skill

Canonical Sources

This skill references the following globals — read them BEFORE starting work:

system/globals/accessibility.md — WCAG rules, ARIA patterns, keyboard nav, focus styles

system/globals/colors.md — Contrast ratios, color semantics

Domain

WCAG 2.1 AA, ARIA, Keyboard Navigation, Contrast, Screen Readers

KPIs

Metric	Target	Measurement
Lighthouse Accessibility	>90	Lighthouse JSON → `categories.accessibility.score * 100`
Pa11y Errors	0	`npx pa11y <URL> --reporter=json`
Images without Alt	0	`npm run check:kpis`

Non-Negotiable

These rules always apply — even under time pressure, even for "it's just an internal tool":

No element without alt text. Not even "because it's a template" — templates set the standard for thousands of projects built on top of them.
No div instead of button for clickable elements. Not even "because it's easier." A div is not focusable, not keyboard-operable, and is ignored by screen readers.
No commit without heading hierarchy. "It's just a landing page" is not an excuse — screen readers navigate via headings.
Dark mode is mandatory from day 1. "We'll add it later" doesn't work — CSS variables must be correct from the start. Retrofitting is double the work.
Keyboard navigation is not a nice-to-have. "Users only use the mouse anyway" is wrong — 25% of users rely on keyboard, assistive technology, or both.

Before Applying

Read LEARNINGS.md in this directory to avoid known anti-patterns.

Files

What ships with it

1 file 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.

LEARNINGS.md 349 B

Changes

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.

2mo ago First seen · 39 lines · 33 tokens per session scan A 080a3c3daa9c

Subscribe to this mod's changes

accessibility is a skill published in the GitHub repository holger1411/astrodeck (81 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 429 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.

Design and UX Frontend

accessibility next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
accessibilityholger1411/astrodeck	Skill	81	2mo ago	MIT	A	33	Claude Code
webgl-holographic-foilnexu-io/open-design	Skill	106k	today	Apache-2.0	A	41	Claude Code, Codex
html-ppt-hermes-cyber-terminalnexu-io/open-design	Skill	106k	today	Apache-2.0	A	53	Claude Code, Codex
html-ppt-taste-brutalistnexu-io/open-design	Skill	106k	today	Apache-2.0	A	78	Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	3d ago	MIT	A	52	Codex
glance-canonical-layoutsandroid/skills	Skill	10k	yesterday	Apache-2.0	A	56	Claude Code
accessibilitymicrosoft/hve-core	Skill	1.6k	yesterday	MIT	A	47	Claude Code

astrodeck: Skill for Claude Code