accessibility-audit

accessibility-audit is a skill for Claude Code from marcoguillermaz/Tierward. It costs 0 tokens per session (5,231 once invoked), scanned A, original, MIT.

An accessibility review workflow for web applications, combining code checks with browser scans when a development server is available.

In plain words
What is it for?
Use it to run static checks and live axe-core WCAG 2.2 scans, measure contrast with APCA, and inspect accessibility across routes.
Why use it?
It helps find barriers such as missing form labels, unclear focus states, poor contrast, and incorrect keyboard or screen-reader support.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter; mentions subagents.

Part of the tierward plugin — 29 skills, 1 command, 1 hook, 1 MCP server shipped together

Good fit Use it to run static checks and live axe-core WCAG 2.2 scans, measure contrast with APCA, and inspect accessibility across routes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/marcoguillermaz/tierward/accessibility-audit
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.

Any agent
npx skills add marcoguillermaz/Tierward --skill accessibility-audit
Clone the repo
git clone --depth 1 https://github.com/marcoguillermaz/Tierward

Made for: Claude Code.

Or install tierward, the plugin that ships this one along with the rest of its 29 skills, 1 command, 1 hook, 1 MCP server.

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.

agentmods badge for accessibility-audit

README.md
[![agentmods](https://agentmods.dev/badge/skills/marcoguillermaz/tierward/accessibility-audit/github.svg)](https://agentmods.dev/skills/marcoguillermaz/tierward/accessibility-audit)
Your own site
<a href="https://agentmods.dev/skills/marcoguillermaz/tierward/accessibility-audit"><img src="https://agentmods.dev/badge/skills/marcoguillermaz/tierward/accessibility-audit/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.

agentmods 80×15 button for accessibility-audit

Your own site · 80×15
<a href="https://agentmods.dev/skills/marcoguillermaz/tierward/accessibility-audit"><img src="https://agentmods.dev/badge/skills/marcoguillermaz/tierward/accessibility-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,231 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.05231
Opus 5 $0.00000 $0.02616
Sonnet 5 $0.00000 $0.01046
Haiku 4.5 $0.00000 $0.00523

Measured 10d ago against content hash 31f6fdfe9a43, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

accessibility-audit scanned grade A with 1 finding 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 10d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

allowed-tools: Read Glob Grep Bash(curl:*) mcp__playwright__browser_navigate mcp__playwright__browser_evaluate mcp__playwright__browser_wait_for Agent Edit Write
packages/cli/templates/tier-l/.claude/skills/accessibility-audit/SKILL.md · 363 lines

How it starts

The opening of the file, as written. The whole thing — 363 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Configuration (fill in before first run)

Replace these placeholders:

  • [DEV_URL] - e.g. http://localhost:3000
  • [SITEMAP_OR_ROUTE_LIST] - e.g. docs/sitemap.md
  • [APP_SOURCE_GLOB] - e.g. app/**/page.tsx + components/**/*.tsx, src/**/*.vue, templates/**/*.html
  • [DEV_COMMAND] - e.g. npm run dev, python manage.py runserver, swift run

Then fill in the APCA probe selectors in Step 3 (see Stack adaptation section at end).

Single source of truth for accessibility checks across the project. Combines static grep-based checks (run in all modes) with live browser checks (axe-core WCAG scan + APCA contrast measurement) when a dev server is available.

Scope boundary:

  • Owns: static a11y patterns (aria, tabindex, labels, focus, keyboard), axe-core WCAG 2.2 scan, APCA contrast computation.
  • Not here: design token compliance and component adoption → /ui-audit. Typography and aesthetic polish → /visual-audit. Viewport-specific a11y (WCAG 1.4.4 resize, 1.4.10 reflow, tap targets) → /responsive-audit.

Two execution modes:

  • Static mode (dev server not running): Steps 0-2, 5 only. Can run concurrently with browser-based skills per pipeline.md.
  • Full mode (dev server running): all steps including APCA contrast + axe-core scan. Sequential - shares the browser MCP session with other live audits.
  • WCAG mode (wcag): same as full, plus axe-core best-practice tag.

Step 0 - Target resolution + mode selection

Parse $ARGUMENTS for an optional mode keyword and a target: token.

Pattern Meaning
static Force static mode - skip Steps 3-4 even if dev server is available
full Force full mode - fail if dev server is unreachable
wcag Full mode + axe-core best-practice tag (more stringent)
No mode keyword Auto - full if dev server responds, else static with a warning
target:route:<path> Restrict live scan to a single route (e.g. target:route:/dashboard)
target:file:<glob> Restrict static checks to matching files (e.g. target:file:src/**/page.tsx)
target:role:<role> Restrict to routes accessible by that role (from [SITEMAP_OR_ROUTE_LIST])
No target argument Full audit - all page/component files from [SITEMAP_OR_ROUTE_LIST]

Read the full file on GitHub · 363 lines

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.

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. 10d ago First seen · 363 lines · 0 tokens per session scan A 31f6fdfe9a43

Subscribe to this mod's changes

accessibility-audit is a skill published in the GitHub repository marcoguillermaz/Tierward (4 stars, last pushed 3d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 5,231 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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