Web Accessibility (WCAG 2.1 AA) Auditor

Name: Web Accessibility (WCAG 2.1 AA) Auditor
Author: A11y Champions

Verified Secure

Created by A11y Champions•security Workflow

Audit color contrast, ARIA landmarks, screen reader announcements, and keyboard traps.

Supported Runtimes:codexclaude-codecursorwindsurf

Universal 1-Click Installer

npx askills install accessibility-a11y

Installs automatically to ~/.agents/skills or ~/.codex/skills

•Raw Endpoint

Overview & Problem Solved

When modern frontier LLMs (like Claude 3.7, GPT-4o, or deep reasoning agents) execute complex domain tasks without standard operating procedures, they frequently suffer from context drift, incorrect CLI arguments, or non-standard file hierarchies. Web Accessibility (WCAG 2.1 AA) Auditor eliminates probabilistic guessing by supplying the Agent with an authoritative, sandboxed execution specification.

By packaging verified workflows into a structured SKILL.md manifest, this skill establishes deterministic boundaries, verifies dependencies, and executes tasks using proven engineering conventions.

Core Capabilities & Guarantees

Deterministic SOP Enforcement

Follows pre-tested instructions and step-by-step algorithms, avoiding experimental or hallucinated flags.

Multi-Runtime Isolation

Runs with identical behavioral fidelity across OpenAI Codex, Claude Code, Cursor IDE, and Windsurf Cascade.

Sandbox-Scoped Boundaries

Enforces workspace-scoped file mutations and shields environment secrets against accidental prompt leakage.

Self-Healing QA Verification

Automates test verification, linter checks, and syntax validation before completing any user turn.

Agent Execution Pipeline

Intent Matching & Context Ingestion

The agent scans the user request against the skill's YAML frontmatter triggers and loads the verified instructions into active working memory.

Toolchain & Dependency Validation

The runtime verifies that necessary tools, interpreters, and environment configurations exist within the workspace sandbox before proceeding.

Deterministic Execution & Delivery

The agent executes the codified SOP, runs verification checks, and outputs high-fidelity deliverables without extraneous narration.

Validated Prompt Templates

(Click to copy)

“Audit our checkout modal for keyboard accessibility and ensure focus is trapped properly.”

“Verify all text elements against background colors for minimum 4.5:1 WCAG AA contrast ratio.”

“Add correct aria-expanded, aria-controls, and role attributes to our collapsible accordion.”

Automated Security & Audit Report

Score:98/100 (SAFE)

Filesystem

Workspace Scoped

Cannot escape workspace root

Shell Execution

Instruction Only

Zero system subprocesses

Network Access

Offline Sandbox

No internet egress

API Keys Required

None Required

Runs fully standalone

Audited and verified safe for local agent execution.

Enterprise & Production Use Cases

Autonomous Development SprintsEnables coding agents to independently build features, run lint tests, and author PR descriptions that strictly conform to organizational coding rules.

Batch Automation & CI/CD PipelinesAutomates repetitive transformations such as document generation, schema migrations, or test-suite updates inside containerized CI runners.

Standardized Engineering OnboardingDistributes unified development playbooks across all engineering team members using Cursor, Codex, or Claude Code.

Frequently Asked Questions

Q: What makes Web Accessibility (WCAG 2.1 AA) Auditor different from a standard MCP server?

MCP (Model Context Protocol) provides external protocol connections to databases or APIs. In contrast, Web Accessibility (WCAG 2.1 AA) Auditor is a high-level operational skill (SKILL.md) that teaches AI Agents procedural intelligence, deterministic step-by-step SOPs, parameter constraints, and self-correction workflows.

Q: Is Web Accessibility (WCAG 2.1 AA) Auditor compatible with frontier models like Claude 3.7 Sonnet, GPT-4o, and DeepSeek-R1?

Yes. The skill is packaged with standard markdown instructions (SKILL.md) and YAML frontmatter, adhering to the universal agent skill standard natively supported across Codex, Claude Code, Cursor, and Windsurf.

Q: What permissions does Web Accessibility (WCAG 2.1 AA) Auditor require in agent mode?

Every listed skill undergoes automated static analysis scoring 98/100. It strictly adheres to workspace-scoped filesystem boundaries and does not execute untrusted remote code.

Q: Can our team customize or extend the rules in this SKILL.md?

Yes. Once installed in your project root (.skills/accessibility-a11y/SKILL.md or ~/.agents/skills/accessibility-a11y/), you can customize the instructions to include internal team guidelines, custom linters, or proprietary APIs.

SKILL.md Source Specification

View Raw

---
name: "accessibility-a11y"
description: "Audit color contrast, ARIA landmarks, screen reader announcements, and keyboard traps."
---

# Web Accessibility (WCAG 2.1 AA) Auditor

Ensures complete ADA and WCAG 2.1 compliance. Checks focus rings, alt text, and semantic HTML5 tags.

## Instructions and Rules
1. Read existing repository patterns before making modifications.
2. Adhere strictly to the workspace directory boundaries.
3. Verify changes with unit or integration tests before concluding.