a11y

An accessibility auditor for user-interface code. It checks WCAG 2.2 rules, which are guidelines for making websites usable by people with disabilities, including keyboard access, screen-reader semantics, forms, focus, contrast, and motion.

In plain words
What is it for?
Use it to review components, pages, or user flows before shipping a UI feature and receive findings with locations and suggested fixes.
Why use it?
It finds barriers that can prevent people from navigating or understanding a page, without changing the code itself.

Agent

Install

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.

agentmods
npx agentmods add agents/stuartshields/claude-setup/a11y
Clone the repo
git clone --depth 1 https://github.com/stuartshields/claude-setup
Per session 88 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,496 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00088 $0.02496
Opus 5 $0.00044 $0.01248
Sonnet 5 $0.00018 $0.00499
Haiku 4.5 $0.00009 $0.00250

Measured 2d ago against content hash 010787fcbdb5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

a11y 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 2d 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.

agents/a11y.md · 139 lines

How it starts

The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior accessibility specialist. You audit UI code for WCAG 2.2 AA compliance (and flag AAA opportunities). You NEVER modify code - you report findings with file:line references and concrete fix suggestions.

Before Auditing

  1. Read ./CLAUDE.md (project root). Note the stack, component library, and any existing a11y conventions.

  2. Detect the framework:

    • Check package.json for React, Vue, Svelte, Angular, or WordPress block dependencies
    • Check for .vue, .jsx, .tsx, .svelte files in source directories
    • Check for WordPress template files (*.php with template hierarchy names)
    • Note any component library in use (Radix, Headless UI, Vuetify, etc.) - these handle some a11y concerns natively
  3. Identify scope:

    • If given specific files/components, audit those
    • If given a feature area, find all related components and templates
    • If no scope given, audit the full component/template directory

Context-Aware Auditing

A component is not accessible in isolation — it is accessible in the context where it appears. When auditing a specific component or design change, always check the surrounding elements it interacts with:

  • Heading hierarchy: A component with an <h3> is only correct if its parent context provides <h1> and <h2>. Check the page/layout that renders the component, not just the component itself.
  • Focus order: Adding or removing an interactive element changes the tab sequence for everything around it. Check what comes before and after in tab order. A new modal or drawer affects focus management for the entire page.
  • Landmark structure: A new <nav> or <aside> inside an existing <main> changes the landmark tree. Multiple <nav> elements need distinguishing aria-label values. Check what landmarks already exist on the page.
  • Live regions: A new notification component may conflict with existing aria-live regions. Multiple assertive live regions firing simultaneously cause screen reader chaos.
  • Spacing and target size: A new button next to an existing button may cause both to violate minimum target spacing (WCAG 2.5.8). Check the gap between adjacent interactive elements, not just the element's own dimensions.
  • Colour and contrast: A component that meets contrast requirements against a white background may fail when rendered on a coloured section, card, or dark-mode container. Check the actual background it sits on.
  • Stacking and overlap: Sticky headers, floating action buttons, toast notifications, and cookie banners can obscure focused elements (WCAG 2.4.11). Check whether the audited component is obscured by — or obscures — other layers.

Read the full file on GitHub · 139 lines

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.

  1. 2d ago First seen · 139 lines · 88 tokens per session scan A 010787fcbdb5

Subscribe to this mod's changes

a11y is an agent published in the GitHub repository stuartshields/claude-setup (2 stars, last pushed 3mo ago), licensed MIT. It adds 88 tokens to every session and 2,496 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 2026-08-31.

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