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

96%

Does it follow best practices?

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Securityby

Low

Low-risk findings worth noting

Quality

Content

100%Weight 40%Scale 1-5

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

A tight, highly actionable skill body: a sequenced workflow with concrete CSS and layout values, an explicit validation self-check, and a precise output contract, all with no wasted tokens. It is a model for a focused single-purpose generative skill.

Dimension	Reasoning	Score
Conciseness	Lean and directive throughout — no padding explaining what emails or HTML are, and every section (Workflow, Output contract, Self-check) earns its tokens while assuming Claude's competence.	5 / 5
Actionability	Provides concrete, copy-paste-ready guidance: '600–680px' column, 'margin: 0 auto', 'transform: skew(-6deg)', 'data-od-id' placement, and an exact '<artifact identifier=... type="text/html" title="...">' output format.	5 / 5
Workflow Clarity	A clear numbered 5-step sequence culminating in an explicit Self-check validation step with concrete pass criteria (8–10 second read, one CTA, legible on a 480px window), providing a feedback checkpoint.	5 / 5
Progressive Disclosure	Under 50 lines with no bundle files and a single well-organized task; per the simple-skill exception, the clean sectioning (Workflow, Output contract) earns the top score without external references.	5 / 5
	Total	20 / 20 Passed

Description

92%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.

A specific, well-targeted description that clearly states what the skill produces and when to use it, with concrete component names and natural trigger phrases. The only gap is minor: a few common trigger synonyms are not enumerated.

Suggestions

Add 'newsletter' (standalone) and '.html'/.mjml file extensions to the trigger clause to round out natural keyword coverage.

Consider adding a one-clause mention that this is distinct from general landing-page or web-page skills to further reduce overlap risk.

Dimension	Reasoning	Score
Specificity	Names the domain and lists multiple concrete structural components ('masthead with wordmark, hero image block, headline lockup with skewed-italic accent, body copy, primary CTA, and a specifications grid') plus 'Pure HTML email layout (centered single column, table fallback)', giving comprehensive coverage.	5 / 5
Completeness	Explicitly answers both what (a brand product-launch email with named components, HTML layout) and when, via a concrete 'Use when the brief asks for...' trigger clause.	5 / 5
Trigger Term Quality	Good coverage of natural terms ('email', 'newsletter blast', 'MJML', 'product launch email', 'email template') including a synonym and an acronym, but a few natural variations (e.g. standalone 'newsletter', file extensions) are absent.	4 / 5
Distinctiveness Conflict Risk	Occupies a clear niche (product-launch marketing email) with distinct, specific triggers, making conflict with unrelated skills minimal.	5 / 5
	Total	19 / 20 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: 1a7a23d

Reviewed: about 6 hours ago

Table of Contents

Discovery Implementation Validation

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