An accessibility audit based on WCAG 2.1 and 2.2, the international guidelines for making websites usable by people with disabilities. It checks areas such as images, forms, keyboard use, color contrast, page structure, and ARIA attributes.

Use it to review a website for accessibility issues, prepare for an accessibility compliance check, and identify fixes for critical through minor findings.

It finds barriers that can prevent people from navigating, understanding, or operating a website, and groups them by impact.

wcag-audit — Agent for Claude Code by christopherlouet

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.

Clone the repo

git clone --depth 1 https://github.com/christopherlouet/claude-base

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/agents/christopherlouet/claude-base/wcag-audit.svg)](https://agentmods.dev/agents/christopherlouet/claude-base/wcag-audit)

Your own site

<a href="https://agentmods.dev/agents/christopherlouet/claude-base/wcag-audit"><img src="https://agentmods.dev/badge/agents/christopherlouet/claude-base/wcag-audit.svg" alt="Measured on agentmods" height="20"></a>

Per session 40 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,094 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.

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	$0.00040	$0.01094
Opus 5	$0.00020	$0.00547
Sonnet 5	$0.00008	$0.00219
Haiku 4.5	$0.00004	$0.00109

Measured 6d ago against content hash 958e198f2eb7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

wcag-audit 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 6d 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/agents/wcag-audit.md · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent WCAG-AUDIT

Accessibility audit per WCAG 2.1/2.2 level AA, inspired by the axe-core reference.

Impact levels

Level	Definition
Critical	Completely blocks access
Serious	Significant impact on usability
Moderate	Hinders user experience
Minor	Desirable improvement

Audit categories (11)

Images/media: alt, SVG, object, video captions, autoplay
Forms: labels, select, errors, autocomplete
Keyboard: visible focus, traps, skip-link, scrollable, nested interactive
Buttons/links: accessible names, descriptive links, link-in-text-block
Colors/contrast: AA ratios, color alone
ARIA: allowed/required/prohibited attrs, valid roles, parent/child relations, aria-hidden+focus
Structure/semantics: html lang, title, headings, landmarks, regions, lists
Tables: th, scope, headers, caption
Frames/iframes: title, uniqueness, focus
Deprecated elements: blink, marquee, meta-refresh, autoplay
WCAG 2.2: target-size 44x44px, focus-not-obscured

Patterns to search for

Images

<img(?![^>]*alt=)
<svg(?![^>]*aria-label)(?![^>]*role="presentation")
<input\s[^>]*type="image"(?![^>]*alt=)
<object(?![^>]*aria-label)(?![^>]*title=)

Forms

<input(?![^>]*aria-label)(?![^>]*id=.*<label[^>]*for=)
<select(?![^>]*aria-label)(?![^>]*id=)

ARIA

aria-[a-z]+="[^"]*"   # verify validity of values
role="(?!alert|button|checkbox|dialog|grid|img|link|list|listbox|menu|menubar|menuitem|navigation|option|progressbar|radio|region|search|slider|tab|tablist|tabpanel|textbox|timer|toolbar|tooltip|tree|treeitem)[a-z]+"
aria-hidden=["']true["'][^>]*tabindex=(?!["']-1)
aria-hidden=["']true["'][^>]*<button

Structure

<html(?![^>]*lang=)
<title>\s*</title>
<title/>

Tables and frames

<table(?![^>]*role=["']presentation)(?![\s\S]*?<th)
<th(?![^>]*scope=)
<iframe(?![^>]*title=)

Deprecated elements

<blink
<marquee
<meta[^>]*http-equiv=["']refresh
autoplay(?![^>]*muted)

Read the full file on GitHub · 127 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.

6d ago First seen · 127 lines · 40 tokens per session scan A 958e198f2eb7

Subscribe to this mod's changes

wcag-audit is an agent published in the GitHub repository christopherlouet/claude-base (5 stars, last pushed yesterday), licensed MIT. It adds 40 tokens to every session and 1,094 once invoked, about $0.0002 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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