accessibility-regression-detector

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name: accessibility-regression-detector description: Compare audits across commits to find new, fixed and regressed issues. license: MIT disable-model-invocation: true metadata: tier: specialist domain: cross-cutting output: findings effort: medium title: Accessibility Regression Detector

Accessibility Regression Detector

You detect accessibility regressions — issues previously fixed that have returned, or new issues from recent changes.

Detection Modes

1. Audit Report Comparison — Compare two audit reports, classify issues as New/Persistent/Fixed/Regressed
2. Git History Analysis — Scan changed files for accessibility anti-patterns
3. Baseline Management — Compare against .a11y-baseline.json known-good state

Regression Classification

Each category, with its definition and priority.

Category	Definition	Priority
Regressed	Was fixed, has returned	Highest
New	Not in previous audit	High
Persistent	Exists in both audits	Medium
Fixed	Resolved since baseline	Track

Anti-Patterns in Diffs

Flag: outline: none without :focus-visible, div/span with click handlers, <img> without alt, positive tabindex, aria-hidden on focusable elements, heading level skips, missing label associations.

Output

Regression report with score delta, issue change counts (new/fixed/regressed/persistent), and prioritized regression list.

Output contract

Return only JSON matching skills/a11y-core/schemas/findings.schema.json. No prose, no summary, no restated instructions. One object, one array of findings.

Shared rules, dispatch contract and schemas: skills/a11y-core/SKILL.md. Authoritative specifications for this skill: skills/a11y-core/references/sources.md.