Conciseness

The body is lean and assumes Claude's competence: no concept explanations, just decisions that matter — '600–680px column', 'transform: skew(-6deg)', 'One CTA. Accent appears at most twice'. Every line is instructional; nothing explains things Claude already knows.

Actionability

Guidance is highly concrete — exact column width, CSS centering ('margin: 0 auto'), skew value, ordered layout anatomy, and a literal artifact template with tag names and attributes. It falls short of 5 only because some specifics stay at the hint level, e.g. 'table fallback' is named in the description but the body never shows how to structure the table layout, and the artifact template ends in '<html>...</html>' rather than a runnable skeleton.

Workflow Clarity

A clear 5-step sequence (read DESIGN.md → pick brand → layout → write → self-check) with a self-check checklist covering timing, CTA discipline, and 480px legibility. Not a 5 because the self-check is one-directional: there is no explicit 'if a check fails, fix and re-check' recovery loop.

Progressive Disclosure

No bundle files exist and none are needed: the body is roughly 50 lines, all content belongs inline, and the two sections ('## Workflow', '## Output contract') plus the nested layout list are well-signaled and easy to navigate — matching the simple-skill exception for well-organized short skills.

Specificity

The description enumerates concrete components — 'masthead with wordmark, hero image block, headline lockup with skewed-italic accent, body copy, primary CTA, and a specifications grid' — plus format details ('centered single column, table fallback'). It stops just short of a 5 because it describes the artifact via a noun phrase rather than explicitly stating the actions performed (e.g., 'Generates/produces...'), leaving a minor gap in capability framing.

Completeness

It explicitly answers both questions: what the skill produces (a fully enumerated product-launch email structure in pure HTML) and when to use it ('Use when the brief asks for an "email", "newsletter blast", "MJML", "product launch email", or "email template"'). This matches the top anchor with concrete trigger phrases.

Trigger Term Quality

The 'Use when' clause includes natural terms users would say: "email", "newsletter blast", "MJML", "product launch email", "email template". Not a 5 because a few common variations are missing from the description itself, such as plain "newsletter", "email campaign", or "email design".

Distinctiveness Conflict Risk

The niche is narrow — a brand product-launch marketing email with a specific section anatomy — and the triggers (newsletter blast, MJML, product launch email) are unlikely to fire for unrelated skills. Minimal conflict risk beyond a hypothetical generic 'MJML' skill.