accessibility-auditor: Security & Code Review for AI Agents | OpenAgentSkill

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Accessibility Auditor

Overview

Audits web pages and UI components against WCAG 2.2 (Level AA) success criteria. Identifies violations in color contrast, keyboard navigation, ARIA usage, semantic HTML, form labeling, focus management, and dynamic content updates. Produces actionable fixes with exact code changes.

Instructions

When asked to audit accessibility:

Determine the scope:
- Single component, full page, or entire application?
- Target compliance level: A, AA (default), or AAA?
- Any specific regulations: EAA (European Accessibility Act), ADA, Section 508?
Check semantic structure (WCAG 1.3.1, 1.3.2):
- Heading hierarchy: h1 → h2 → h3, no skipped levels
- Landmark regions: <nav>, <main>, <header>, <footer>, <aside>
- Lists use <ul>/<ol>/<dl>, not styled <div>s
- Tables have <th> with scope, and <caption> where appropriate
- Reading order matches visual order
Check text alternatives (WCAG 1.1.1):
- All <img> have meaningful alt text (not "image", "photo", or filename)
- Decorative images use alt="" or role="presentation"
- SVG icons have <title> or aria-label
- Complex images (charts, diagrams) have extended descriptions
- Video/audio have captions and transcripts
Check color and contrast (WCAG 1.4.3, 1.4.11):
- Normal text: minimum 4.5:1 contrast ratio
- Large text (18px+ or 14px+ bold): minimum 3:1
- UI components and graphical objects: minimum 3:1
- Information not conveyed by color alone (WCAG 1.4.1)
- Compute exact contrast ratios for flagged elements
Check keyboard accessibility (WCAG 2.1.1, 2.1.2, 2.4.7):
- All interactive elements reachable via Tab key
- No keyboard traps (user can always Tab away)
- Focus indicators visible (not outline: none without replacement)
- Custom components have appropriate keyboard handlers (Enter, Space, Arrow keys)
- Modal dialogs trap and restore focus correctly
- Skip-to-content link present
Check ARIA usage (WCAG 4.1.2):
- ARIA roles match element behavior
- Required ARIA attributes present (e.g., aria-expanded on toggles)
- aria-live regions for dynamic content updates
- No redundant ARIA (e.g., role="button" on <button>)
- aria-label/aria-labelledby on elements without visible text
Check forms (WCAG 1.3.5, 3.3.1, 3.3.2):
- All inputs have associated <label> elements (not just placeholder text)
- Error messages are programmatically associated with inputs
- Required fields indicated with more than just color
- autocomplete attributes on common fields (name, email, address)
- Form validation errors announced to screen readers
Output format for each violation:
- WCAG criterion number and name
- Severity: Critical / Major / Minor
- Element and location (file:line or CSS selector)
- What's wrong (specific, not generic)
- Exact code fix
- Who is affected (screen reader users, keyboard users, low vision, etc.)

Examples

Example 1: Component audit

Input:

Audit this React login form for accessibility:
<form onSubmit={handleLogin}>
  <input type="email" placeholder="Email" value={email} onChange={setEmail} />
  <input type="password" placeholder="Password" value={pw} onChange={setPw} />
  <div className="error" style={{color: 'red'}}>{error}</div>
  <div className="submit-btn" onClick={handleLogin}>Log In</div>
</form>

Output:

Accessibility Audit: Login Form
=================================
6 violations found (3 Critical, 2 Major, 1 Minor)

CRITICAL [WCAG 1.3.5] — Missing autocomplete attributes
  Elements: email input, password input
  Fix: Add autocomplete="email" and autocomplete="current-password"
  Affected: Users relying on autofill, password managers, and assistive tech

CRITICAL [WCAG 3.3.2] — Inputs have no accessible labels
  Elements: both <input> fields
  Problem: Placeholder text disappears on focus and is not a label.
  Fix: Add <label htmlFor="email">Email</label> before each input,
       or use aria-label="Email address" as minimum.

CRITICAL [WCAG 2.1.1] — Submit button is not keyboard accessible
  Element: <div className="submit-btn">
  Problem: <div> is not focusable and onClick doesn't fire on Enter key.
  Fix: Replace with <button type="submit">Log In</button>

MAJOR [WCAG 3.3.1] — Error message not associated with input
  Element: <div className="error">
  Fix: Add role="alert" and aria-live="polite" to announce errors.
       Associate with input: aria-describedby="login-error" on the relevant input.

MAJOR [WCAG 1.4.1] — Error indicated by color alone
  Element: error div with color: red
  Fix: Add an icon (⚠) or prefix "Error:" to the text.

MINOR [WCAG 1.4.3] — Verify error text contrast
  Red (#FF0000) on white (#FFFFFF) = 4.0:1 — fails for normal text.
  Fix: Use #D32F2F (darker red) for 5.9:1 ratio.

Input:

Check keyboard accessibility of our dropdown menu component in src/components/Dropdown.tsx

Output:

Keyboard Audit: Dropdown Component
====================================
3 violations found.

CRITICAL [WCAG 2.1.2] — Keyboard trap in open dropdown
  When dropdown is open, Tab moves focus into the list but pressing Escape
  does nothing. User is trapped.
  Fix: Add onKeyDown handler:
    if (e.key === 'Escape') { setOpen(false); triggerRef.current.focus(); }

MAJOR [WCAG 2.1.1] — Arrow key navigation missing
  Dropdown items are only reachable via Tab. Standard pattern requires
  ArrowDown/ArrowUp to move between options.
  Fix: Add roving tabIndex pattern — active item gets tabIndex={0},
       others get tabIndex={-1}. ArrowDown moves focus to next item.

MAJOR [WCAG 4.1.2] — Missing ARIA attributes
  The trigger button lacks aria-expanded and aria-haspopup.
  Fix: <button aria-expanded={isOpen} aria-haspopup="listbox">
       The list needs role="listbox" and items need role="option".

Guidelines

Default to WCAG 2.2 Level AA unless the user specifies otherwise.
Always provide exact code fixes, not just descriptions of the problem.
Prioritize Critical issues (blocks entire user groups) over Minor (suboptimal experience).
Test ARIA patterns against established WAI-ARIA Authoring Practices for correctness.
Note that automated audits catch ~30% of accessibility issues — recommend manual testing with screen readers for the rest.
For color contrast, calculate actual ratios — don't eyeball it.
Flag tabIndex values greater than 0 as an anti-pattern (disrupts natural tab order).

View source ↗

File metadata

name: accessibility-auditor
description: >-
  Audit web pages and components for WCAG 2.2 accessibility compliance. Use when
  a user asks to check accessibility, find a11y issues, audit for WCAG compliance,
  fix screen reader problems, check color contrast, ensure keyboard navigation works,
  or prepare for accessibility regulations like the European Accessibility Act or ADA.
license: Apache-2.0
compatibility: "Works with any HTML/JSX/Vue/Svelte component code. Framework-agnostic."
metadata:
  author: terminal-skills
  version: "1.0.0"
  category: development
  tags: ["accessibility", "wcag", "a11y", "compliance", "screen-reader"]

View original text

---
name: accessibility-auditor
description: >-
  Audit web pages and components for WCAG 2.2 accessibility compliance. Use when
  a user asks to check accessibility, find a11y issues, audit for WCAG compliance,
  fix screen reader problems, check color contrast, ensure keyboard navigation works,
  or prepare for accessibility regulations like the European Accessibility Act or ADA.
license: Apache-2.0
compatibility: "Works with any HTML/JSX/Vue/Svelte component code. Framework-agnostic."
metadata:
  author: terminal-skills
  version: "1.0.0"
  category: development
  tags: ["accessibility", "wcag", "a11y", "compliance", "screen-reader"]
---

# Accessibility Auditor

## Overview

Audits web pages and UI components against WCAG 2.2 (Level AA) success criteria. Identifies violations in color contrast, keyboard navigation, ARIA usage, semantic HTML, form labeling, focus management, and dynamic content updates. Produces actionable fixes with exact code changes.

## Instructions

When asked to audit accessibility:

1. **Determine the scope:**
   - Single component, full page, or entire application?
   - Target compliance level: A, AA (default), or AAA?
   - Any specific regulations: EAA (European Accessibility Act), ADA, Section 508?

2. **Check semantic structure (WCAG 1.3.1, 1.3.2):**
   - Heading hierarchy: h1 → h2 → h3, no skipped levels
   - Landmark regions: `<nav>`, `<main>`, `<header>`, `<footer>`, `<aside>`
   - Lists use `<ul>`/`<ol>`/`<dl>`, not styled `<div>`s
   - Tables have `<th>` with `scope`, and `<caption>` where appropriate
   - Reading order matches visual order

3. **Check text alternatives (WCAG 1.1.1):**
   - All `<img>` have meaningful `alt` text (not "image", "photo", or filename)
   - Decorative images use `alt=""` or `role="presentation"`
   - SVG icons have `<title>` or `aria-label`
   - Complex images (charts, diagrams) have extended descriptions
   - Video/audio have captions and transcripts

4. **Check color and contrast (WCAG 1.4.3, 1.4.11):**
   - Normal text: minimum 4.5:1 contrast ratio
   - Large text (18px+ or 14px+ bold): minimum 3:1
   - UI components and graphical objects: minimum 3:1
   - Information not conveyed by color alone (WCAG 1.4.1)
   - Compute exact contrast ratios for flagged elements

5. **Check keyboard accessibility (WCAG 2.1.1, 2.1.2, 2.4.7):**
   - All interactive elements reachable via Tab key
   - No keyboard traps (user can always Tab away)
   - Focus indicators visible (not `outline: none` without replacement)
   - Custom components have appropriate keyboard handlers (Enter, Space, Arrow keys)
   - Modal dialogs trap and restore focus correctly
   - Skip-to-content link present

6. **Check ARIA usage (WCAG 4.1.2):**
   - ARIA roles match element behavior
   - Required ARIA attributes present (e.g., `aria-expanded` on toggles)
   - `aria-live` regions for dynamic content updates
   - No redundant ARIA (e.g., `role="button"` on `<button>`)
   - `aria-label`/`aria-labelledby` on elements without visible text

7. **Check forms (WCAG 1.3.5, 3.3.1, 3.3.2):**
   - All inputs have associated `<label>` elements (not just placeholder text)
   - Error messages are programmatically associated with inputs
   - Required fields indicated with more than just color
   - `autocomplete` attributes on common fields (name, email, address)
   - Form validation errors announced to screen readers

8. **Output format for each violation:**
   - WCAG criterion number and name
   - Severity: Critical / Major / Minor
   - Element and location (file:line or CSS selector)
   - What's wrong (specific, not generic)
   - Exact code fix
   - Who is affected (screen reader users, keyboard users, low vision, etc.)

## Examples

### Example 1: Component audit

**Input:**
```
Audit this React login form for accessibility:
<form onSubmit={handleLogin}>
  <input type="email" placeholder="Email" value={email} onChange={setEmail} />
  <input type="password" placeholder="Password" value={pw} onChange={setPw} />
  <div className="error" style={{color: 'red'}}>{error}</div>
  <div className="submit-btn" onClick={handleLogin}>Log In</div>
</form>
```

**Output:**
```
Accessibility Audit: Login Form
=================================
6 violations found (3 Critical, 2 Major, 1 Minor)

CRITICAL [WCAG 1.3.5] — Missing autocomplete attributes
  Elements: email input, password input
  Fix: Add autocomplete="email" and autocomplete="current-password"
  Affected: Users relying on autofill, password managers, and assistive tech

CRITICAL [WCAG 3.3.2] — Inputs have no accessible labels
  Elements: both <input> fields
  Problem: Placeholder text disappears on focus and is not a label.
  Fix: Add <label htmlFor="email">Email</label> before each input,
       or use aria-label="Email address" as minimum.

CRITICAL [WCAG 2.1.1] — Submit button is not keyboard accessible
  Element: <div className="submit-btn">
  Problem: <div> is not focusable and onClick doesn't fire on Enter key.
  Fix: Replace with <button type="submit">Log In</button>

MAJOR [WCAG 3.3.1] — Error message not associated with input
  Element: <div className="error">
  Fix: Add role="alert" and aria-live="polite" to announce errors.
       Associate with input: aria-describedby="login-error" on the relevant input.

MAJOR [WCAG 1.4.1] — Error indicated by color alone
  Element: error div with color: red
  Fix: Add an icon (⚠) or prefix "Error:" to the text.

MINOR [WCAG 1.4.3] — Verify error text contrast
  Red (#FF0000) on white (#FFFFFF) = 4.0:1 — fails for normal text.
  Fix: Use #D32F2F (darker red) for 5.9:1 ratio.
```

### Example 2: Keyboard navigation audit

**Input:**
```
Check keyboard accessibility of our dropdown menu component in src/components/Dropdown.tsx
```

**Output:**
```
Keyboard Audit: Dropdown Component
====================================
3 violations found.

CRITICAL [WCAG 2.1.2] — Keyboard trap in open dropdown
  When dropdown is open, Tab moves focus into the list but pressing Escape
  does nothing. User is trapped.
  Fix: Add onKeyDown handler:
    if (e.key === 'Escape') { setOpen(false); triggerRef.current.focus(); }

MAJOR [WCAG 2.1.1] — Arrow key navigation missing
  Dropdown items are only reachable via Tab. Standard pattern requires
  ArrowDown/ArrowUp to move between options.
  Fix: Add roving tabIndex pattern — active item gets tabIndex={0},
       others get tabIndex={-1}. ArrowDown moves focus to next item.

MAJOR [WCAG 4.1.2] — Missing ARIA attributes
  The trigger button lacks aria-expanded and aria-haspopup.
  Fix: <button aria-expanded={isOpen} aria-haspopup="listbox">
       The list needs role="listbox" and items need role="option".
```

## Guidelines

- Default to WCAG 2.2 Level AA unless the user specifies otherwise.
- Always provide exact code fixes, not just descriptions of the problem.
- Prioritize Critical issues (blocks entire user groups) over Minor (suboptimal experience).
- Test ARIA patterns against established WAI-ARIA Authoring Practices for correctness.
- Note that automated audits catch ~30% of accessibility issues — recommend manual testing with screen readers for the rest.
- For color contrast, calculate actual ratios — don't eyeball it.
- Flag `tabIndex` values greater than 0 as an anti-pattern (disrupts natural tab order).

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: Apache-2.0

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.

Start with one small task

1Read the source. Confirm the input, expected output, dependencies and permissions.
2

Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: TerminalSkills/skills
License: Apache-2.0
Version: 1.0.0
Last GitHub push: Jul 26, 2026
Registry updated: Sep 4, 2026
Instruction path: skills/accessibility-auditor/SKILL.md @ 7a5cc96749b0

Version reported in registry metadata; check source releases before relying on it.

Quality

62/100

Promising

Trust

63/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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  "agent_contract": {
    "task_input": "Use accessibility-auditor in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 71/100 Manual review",
      "Audit: 74/100 Needs review",
      "Safety: 30/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "terminalskills-accessibility-auditor (accessibility-auditor)",
      "install_command": "npx skills add TerminalSkills/skills --skill accessibility-auditor",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "terminalskills-accessibility-auditor",
      "task": "Use accessibility-auditor in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/terminalskills-accessibility-auditor",
    "api": "https://www.openagentskill.com/api/agent/skills/terminalskills-accessibility-auditor",
    "audit": "https://www.openagentskill.com/skills/terminalskills-accessibility-auditor/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=terminalskills-accessibility-auditor&task=Use%20accessibility-auditor%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20accessibility-auditor%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20accessibility-auditor%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/terminalskills-accessibility-auditor/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/terminalskills-accessibility-auditor"
  }
}

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Creator: TerminalSkills
Source: TerminalSkills/skills
Indexed by: OpenAgentSkill community index

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/terminalskills-accessibility-auditor?metric=listed&label=Listed)](https://www.openagentskill.com/skills/terminalskills-accessibility-auditor?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/terminalskills-accessibility-auditor?metric=trust&label=Trust)](https://www.openagentskill.com/skills/terminalskills-accessibility-auditor?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/terminalskills-accessibility-auditor?metric=audit&label=Audit)](https://www.openagentskill.com/skills/terminalskills-accessibility-auditor/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/terminalskills-accessibility-auditor?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/terminalskills-accessibility-auditor?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

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Overview

Accessibility Auditor

Overview

Instructions

Examples

Example 1: Component audit

Example 2: Keyboard navigation audit

Guidelines

Review the source

Start with one small task

Source & usage notes

Agent access

Related skills

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