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css-alpha-masking

Apply CSS alpha masking with linear-gradient for horizontal or vertical edge fades (mask-image and -webkit-mask-image). Use when asked for alpha masks, fade edges, or CSS mask gradients.

71

Quality

86%

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SKILL.md
Quality
Evals
Security

Quality

Content

86%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 with copy-paste CSS for both fade orientations and useful customization/pitfall guidance. The only nit is mild redundancy between the workflow and the 'Questions to ask' section.

Suggestions

Merge the 'Questions to ask when specs are missing' into workflow step 1 to remove the redundancy between confirming direction and listing the clarifying questions.

Drop the repeated '/* Add this inline CSS to any element */' comment from one of the code blocks to tighten token usage.

DimensionReasoningScore

Conciseness

Lean and assumes CSS competence, but carries minor redundancy: the workflow's 'Confirm direction' step overlaps with the later 'Questions to ask' section, and the 'Add this inline CSS to any element' comment is repeated.

4 / 5

Actionability

Provides fully executable, copy-paste-ready CSS snippets for both horizontal and vertical fades plus concrete customization values (stop percentages, rgba strength), covering the common cases.

5 / 5

Workflow Clarity

A clear 3-step sequence (confirm direction, provide snippet, offer tweaks) for a non-destructive single-purpose skill; step 1 is a clarifying question rather than a verifiable action, leaving a minor gap.

4 / 5

Progressive Disclosure

Under 50 lines with no need for external references and well-organized section headers, satisfying the simple-skill exception for progressive disclosure.

5 / 5

Total

18

/

20

Passed

Description

87%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 well-crafted description that concretely names the technique and properties, explicitly pairs a 'what' with a 'when' clause, and occupies a distinct niche. Minor trigger-term synonyms could be added but coverage is strong.

DimensionReasoningScore

Specificity

Names the technique ('CSS alpha masking with linear-gradient'), the concrete action ('edge fades'), and specific properties ('mask-image and -webkit-mask-image'), but it is essentially one operation with direction variants rather than multiple distinct actions.

4 / 5

Completeness

Explicitly states what it does ('Apply CSS alpha masking...') and when to use it ('Use when asked for alpha masks, fade edges, or CSS mask gradients') with concrete trigger phrases.

5 / 5

Trigger Term Quality

Includes natural user phrases ('alpha masks', 'fade edges', 'CSS mask gradients') with good coverage, though a few synonyms like 'fade out' or 'gradient mask' are missing.

4 / 5

Distinctiveness Conflict Risk

Occupies a clear niche (CSS alpha masking via mask-image) with distinct triggers and minimal overlap with other skills.

5 / 5

Total

18

/

20

Passed

Validation

100%

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

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
MengTo/Skills
Reviewed

Table of Contents

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