Conciseness

Sections 1–5 are lean and repo-specific (exact enum entries, file paths, registration calls), but §6 ("Tab order: All interactive elements must be reachable via Tab / Shift+Tab", "Focus trapping: Modal dialogs must trap focus") and §7 ("must declare the correct ARIA role (e.g., role=\"button\")", "Avoid generic labels like 'button' or 'icon'") restate standard WAI-ARIA knowledge Claude already has, and §1 carries a second full alternative skeleton. Mostly efficient but could be tightened — not the pervasive padding of a 2, but more than the minor trimming of a 4.

Actionability

Provides a copy-paste-ready TypeScript skeleton with correct import paths, `AccessibleViewRegistry.register(...)` calls, enum and configuration registration snippets with `...baseVerbosityProperty`, `playSignal` usage, `<keybinding:commandId>` syntax, and an exact Key Files listing. The alternative provider pattern is a justified sketch explicitly backed by a pointer to a real codebase example. This matches the fully-executable top anchor.

Workflow Clarity

§1–§3 give clearly numbered steps (create implementation → content provider → onClose → register), the When-to-Use section gives an explicit decision rule (accessible view only for rich/visual content), and the closing checklist validates every section. However, there is no runtime verification step (e.g. launch VS Code, focus the feature, invoke the help dialog) and no error-recovery feedback loop, so it sits at 'clear sequence with most checkpoints present; minor validation gaps' rather than the 5 anchor.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), so this is a single-file skill; it is well structured with numbered sections, in-text navigation ("Sections 4–7 below… apply more broadly to any UI change"), a checklist, and a clearly signaled cross-skill reference. Some bulk (the dual skeletons in §1, the §6 prose on unavailable options) could live in a reference file, keeping it below the well-signaled one-level-deep references of the 5 anchor.

Specificity

The description lists seven concrete coverage areas ("accessibility help dialogs, accessible views, verbosity settings, signals, ARIA announcements, keyboard navigation, and ARIA labels/roles"), but these are topical nouns rather than the concrete action verbs of the top anchor ("Extract… fill forms, merge documents"). It clearly exceeds the generic domain-only anchors but has minor gaps in action-level coverage.

Completeness

Both halves are present: a clear "what" ("Covers accessibility help dialogs, accessible views, verbosity settings, signals, ARIA announcements, keyboard navigation, and ARIA labels/roles") and an explicit "when" ("REQUIRED for new feature and contribution work, and also applies to updates of existing UI"), so the missing-trigger cap does not apply. The when clause is directive but lacks the concrete user-mention trigger phrases ("when the user mentions…") that define the 5 anchor.

Trigger Term Quality

Includes good natural keywords ("accessibility", "VS Code", "feature", "contribution", "UI", "ARIA", "keyboard navigation") that a developer would naturally say, but misses common synonyms like "screen reader", "a11y", and "screen-reader". This matches anchor 4 (good coverage, a few natural terms missing) rather than the synonym-complete anchor 5.

Distinctiveness Conflict Risk

"Primary accessibility skill for VS Code" carves a clear niche with distinct triggers; its breadth ("REQUIRED for new feature and contribution work") is intentional within that niche and creates minimal conflict risk with other skills.