Library Accessibility (a11y)

Make the timepicker-ui picker fully usable by keyboard and assistive technology. This skill is a thin orchestrator: the real work is done by the accessibility subagent. The skill exists to hold the approval gate the subagent can't run itself.

Standard: WCAG 2.2 AA + the WAI-ARIA Authoring Practices (dialog / listbox / combobox / spinbutton patterns). Scope is app/src only - the docs site is /docs-a11y.

Arguments (optional)

• A focus area narrows the run, e.g. /a11y clock, /a11y wheel, /a11y range, /a11y timezone, /a11y modal, /a11y keyboard. No argument = full audit.
• --apply-all skips the per-area approval prompt and applies the whole audited plan (still reports
  • verifies). Use only for an explicitly unattended run.

Workflow

Phase 1 — Audit (read-only)

Dispatch the accessibility subagent (Task tool, subagent_type: accessibility) in audit mode, with the focus area if given. Ask for a prioritized, file-level plan grouped into:

1. Keyboard operability (open/close, selection, AM/PM, OK/Cancel/Clear, tabs, dropdown, wheel)
2. ARIA roles/names/states (dialog, listbox, spinbutton; aria-pressed/selected/disabled/valuenow)
3. Screen-reader feedback (the .timepicker-announcer live region; validation/error announcements)
4. Forms, labels & relationships (all text via the labels group)
5. Non-text & motion (no color-only state; prefers-reduced-motion) Each finding cites its WCAG/APG reference and the exact file + attribute/handler. No edits.

Phase 2 — Present & approve (gate)

Relay the plan concisely (grouped, with references). Use AskUserQuestion to approve all, pick which groups/items to apply, or skip. Capture the approved set. Do not skip this gate unless --apply-all was passed.

Phase 3 — Apply

Dispatch accessibility again in apply mode with the exact approved list. It implements fixes with native ARIA + the existing helpers (announceToScreenReader, updateAriaPressed), adds any new strings to the labels group, and stays within the architecture (engine = no DOM; manager contract; public API unchanged; SSR-safe; CRLF; zero new deps).

Phase 4 — Verify & report

• Offer to run focused checks: relevant Jest specs (npx jest --testPathPattern=...) and/or npm run eslint in app/. Report real output; defer the full suite to the user's batched run.
• Summarize what changed, grouped by the five areas, with the file list.
• Give the manual checklist: keyboard-only walkthrough (Tab/Shift+Tab/Arrows/Esc/Enter/Space), an NVDA/VoiceOver pass on open→select→confirm, and focus returning to the input on close.
• Surface any CSS-contrast item for styling-themes and any structural/logic item for core-architect / clock-engine-dev / plugin-dev.

Guardrails

• app/src only; never edit docs-app/ or dist/.
• Don't change the public API or getValue() shape; visible/AT text goes through labels.
• Keep engine pure (no DOM), manager (core, emitter)+destroy() contract, SSR-safety, CRLF, and the zero-dependency promise intact.
• This skill audits/fixes; git and npm publish stay with the user.