email-marketing

A brand product-launch email — masthead with wordmark, hero image block, headline lockup with skewed-italic accent, body copy, primary CTA, and a specifications grid. Pure HTML email layout (centered single column, table fallback). Use when the brief asks for an "email", "newsletter blast", "MJML", "product launch email", or "email template".

Quality

100%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

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Securityby

Low

Low-risk findings worth noting

Quality

Content

100%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is a tight, actionable spec: an ordered workflow with concrete CSS and pixel guidance, an explicit output contract, and a self-check. It assumes Claude's competence and avoids unnecessary explanation.

Dimension	Reasoning	Score
Conciseness	Lean and instruction-focused throughout; every line directs behavior (layout order, CSS, column widths) with no padding explaining concepts Claude already knows.	3 / 3
Actionability	Gives concrete, specific guidance — 600–680px column, transform: skew(-6deg), margin: 0 auto, ordered element list, and a copy-ready artifact template — leaving no ambiguity about the output.	3 / 3
Workflow Clarity	A clear five-step sequence culminating in a self-check validation checkpoint (readability, single CTA, 480px reflow), giving an explicit feedback loop for the generative task.	3 / 3
Progressive Disclosure	A single well-organized SKILL.md with clear sections (Workflow, Output contract) and no bundle files needed; appropriate for a self-contained skill of this size.	3 / 3
	Total	12 / 12 Passed

Description

100%

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

A strong, concrete description that names specific email components, provides explicit use-when triggers in natural language, and stays in third person. It clearly distinguishes this skill from generic HTML or document skills.

Dimension	Reasoning	Score
Specificity	Lists multiple concrete structural actions — masthead with wordmark, hero image block, headline lockup with skewed-italic accent, body copy, primary CTA, and specifications grid — matching the anchor for specific concrete actions.	3 / 3
Completeness	Explicitly answers what (a brand product-launch HTML email layout) and when ('Use when the brief asks for...') with explicit trigger guidance, written in third person.	3 / 3
Trigger Term Quality	Covers natural terms a user would say — 'email', 'newsletter blast', 'MJML', 'product launch email', 'email template' — with good breadth including common variations.	3 / 3
Distinctiveness Conflict Risk	Occupies a clear niche (marketing product-launch HTML emails) with distinct triggers that are unlikely to fire for unrelated skills.	3 / 3
	Total	12 / 12 Passed

Validation

93%

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 — 15 / 16 Passed

Validation for skill structure

Criteria	Description	Result
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	15 / 16 Passed

Repository: nexu-io/open-design
Path: design-templates/email-marketing/SKILL.md
Commit: f2760fd

Reviewed: about 15 hours ago

Table of Contents

Discovery Implementation Validation

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