a11y-validate

a11y-validate is a skill for Claude Code from softspark/ai-toolkit. It costs 51 tokens per session (4,099 once invoked), scanned A, original, Apache-2.0.

A read-only accessibility scanner for web code based on WCAG 2.1 AA, EN 301 549, and the European Accessibility Act. These standards cover making digital products usable by people with disabilities.

In plain words
What is it for?
Use it to scan a codebase for likely accessibility violations and, when selected, check newer WCAG 2.2 AA requirements.
Why use it?
It helps find accessibility problems related to keyboard use, screen readers, colour contrast, and related compliance checks before release.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: agent in frontmatter.

Part of the ai-toolkit plugin — 115 skills, 44 agents, 14 hooks shipped together

Good fit Use it to scan a codebase for likely accessibility violations and, when selected, check newer WCAG 2.2 AA requirements.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/softspark/ai-toolkit/a11y-validate
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 softspark/ai-toolkit --skill a11y-validate
Clone the repo
git clone --depth 1 https://github.com/softspark/ai-toolkit

Made for: Claude Code.

Or install ai-toolkit, the plugin that ships this one along with the rest of its 115 skills, 44 agents, 14 hooks.

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 a11y-validate

README.md
[![agentmods](https://agentmods.dev/badge/skills/softspark/ai-toolkit/a11y-validate/github.svg)](https://agentmods.dev/skills/softspark/ai-toolkit/a11y-validate)
Your own site
<a href="https://agentmods.dev/skills/softspark/ai-toolkit/a11y-validate"><img src="https://agentmods.dev/badge/skills/softspark/ai-toolkit/a11y-validate/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 a11y-validate

Your own site · 80×15
<a href="https://agentmods.dev/skills/softspark/ai-toolkit/a11y-validate"><img src="https://agentmods.dev/badge/skills/softspark/ai-toolkit/a11y-validate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,099 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00051 $0.04099
Opus 5.5 $0.00020 $0.01640
Sonnet 5.5 $0.00010 $0.00820
Haiku 4.5 $0.00005 $0.00410

Measured 1mo ago against content hash 10652745650e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

a11y-validate 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 1mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/a11y-scanner.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

app/skills/a11y-validate/SKILL.md · 260 lines

How it starts

The opening of the file, as written. The whole thing — 260 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/a11y-validate — Accessibility & EAA Compliance Scanner

$ARGUMENTS

Scan a codebase for accessibility issues using pattern-matching heuristics. Detects violations of WCAG 2.1 Level AA, EN 301 549 (the EU harmonized accessibility standard), and the European Accessibility Act (Directive (EU) 2019/882, "EAA", in force since 28 June 2025). Read-only — never modifies files.

Complements /seo-validate (which only covers SEO-a11y overlap shallowly). Use this skill when the concern is legal accessibility compliance, not search engine ranking.

Standards basis:

  • WCAG 2.1 Level A + AA — W3C Recommendation 2018 (updated 2023).
  • WCAG 2.2 Level AA (opt-in via --standard wcag-2.2-aa) — adds 2.4.11 focus not obscured, 2.5.8 target size minimum, 3.2.6 consistent help, 3.3.7 redundant entry, 3.3.8 accessible authentication.
  • EN 301 549 v3.2.1 — EU harmonized standard; aligned with WCAG 2.1 AA plus additional chapters for mobile, hardware, ICT procurement, authoring tools, and functional-performance statements.
  • EAA / Directive (EU) 2019/882 — legal framework requiring EN 301 549 conformance for consumer-facing digital products and services in EU markets. Deadline: 28 June 2025. Requires accessibility statements per member-state templates.

Usage

/a11y-validate                                # Scan full project, auto-detect framework
/a11y-validate src/                           # Scan specific path
/a11y-validate --scope keyboard               # Only keyboard + focus checks
/a11y-validate --scope media                  # Only captions/transcripts/autoplay
/a11y-validate --scope docs                   # Only EAA accessibility-statement check
/a11y-validate --scope mobile                 # Only React Native + Flutter patterns
/a11y-validate --standard eaa                 # Activate EAA documentation category
/a11y-validate --standard wcag-2.2-aa         # Add WCAG 2.2 criteria
/a11y-validate --severity high                # Filter to HIGH findings
/a11y-validate --framework react-native       # Force framework
/a11y-validate --output json                  # Structured JSON for CI integration

Read the full file on GitHub · 260 lines

Files

What ships with it

7 files 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. 1mo ago First seen · 260 lines · 51 tokens per session scan A 10652745650e

Subscribe to this mod's changes

a11y-validate is a skill published in the GitHub repository softspark/ai-toolkit (180 stars, last pushed 9d ago), licensed Apache-2.0. It adds 51 tokens to every session and 4,099 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.

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