The body is an exemplar of a focused accessibility skill: lean, fully actionable, with a clear sequenced workflow anchored by an explicit verification checklist and a single appropriately-split reference.

Dimension	Reasoning	Score
Conciseness	The body is lean and assumes Claude's competence — it gives requirements and a compact executable example without explaining what a modal, ARIA, or basic HTML is, so every token earns its place.	5 / 5
Actionability	A complete copy-paste native `<dialog>`/`showModal()` example plus specific attributes (aria-labelledby, aria-describedby, aria-modal, tabindex=-1, aria-invalid) and concrete keyboard rules cover the common cases.	5 / 5
Workflow Clarity	A clear build-to-verify sequence is capped by an explicit 8-item verification checklist, with a feedback loop ('document the exception and test the resulting behavior rather than assuming the library is correct') for error recovery.	5 / 5
Progressive Disclosure	SKILL.md is a clear overview of actionable requirements, with rationale and sources split into a single well-signaled one-level-deep reference (references/research.md, verified to exist), giving easy navigation.	5 / 5
	Total	20 / 20 Passed

Description

75%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is specific and well-scoped to a distinct niche, but it lacks an explicit natural-language trigger ('Use when...') clause, relying instead on a scope clarification that does not give Claude concrete trigger phrases.

Suggestions

Add an explicit trigger clause, e.g. 'Use when the user asks to create, fix, or review a modal dialog, popup, or dialog box for keyboard and screen-reader accessibility.'

Include common synonyms users say ('popup', 'lightbox', 'dialog box') to improve trigger-term coverage.

Reframe 'use this for implementation and review, not for generic visual styling' as a positive trigger plus a negative boundary so the 'when' is as concrete as the 'what'.

Dimension	Reasoning	Score
Specificity	The description enumerates multiple concrete capabilities — 'semantics, focus management, keyboard behavior, inert background content, form errors, and verification' — giving comprehensive coverage of the modal accessibility surface, matching the level-5 anchor.	5 / 5
Completeness	The 'what' is clear, but the only 'when'-ish guidance is the scope clarification 'use this for implementation and review, not for generic visual styling' — there is no explicit 'Use when...' trigger clause, which caps completeness at 3 per the rubric guideline.	3 / 5
Trigger Term Quality	Natural terms like 'modal dialogs', 'accessible modal', and 'dialog' are present, but common synonyms a user would actually say ('popup', 'lightbox', 'dialog box') are missing, so it sits just below comprehensive.	4 / 5
Distinctiveness Conflict Risk	'Create or improve accessible modal dialogs' carves a clear niche and the explicit negative boundary 'not for generic visual styling' minimizes conflict with adjacent styling or general accessibility skills.	5 / 5
	Total	17 / 20 Passed

Validation

100%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Reviewed

6 days ago

Table of Contents

Discovery Implementation Validation