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webpagetest

Use when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest. Validate the final browser-facing markup, not just the source framework abstraction.

62

Quality

73%

Does it follow best practices?

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SecuritybySnyk

Low

Low-risk findings worth noting

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tessl review fix ./skills/webpagetest/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

72%

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

The content is token-efficient and well-structured with a properly signaled single-level reference to a real bundle file. It is weaker on actionability and workflow clarity, offering descriptive guidance rather than concrete, sequenced, verifiable steps.

Suggestions

Replace abstract directives with concrete, executable guidance — e.g., specific WebPageTest metrics to read, exact waterfall signals to flag, or commands/config to run a test.

Turn the Check/Fix/Explain sections into an explicit sequenced workflow with a validation checkpoint (e.g., 'after changes, re-run WebPageTest and confirm TTFB/render metrics improved').

Add one short worked example of a rendered-HTML violation and the fix so the Code Review section is actionable rather than directional.

DimensionReasoningScore

Conciseness

The ~30-line body is lean and well-sectioned, with no padding and no explanation of concepts Claude already knows; every section earns its place.

3 / 3

Actionability

Guidance is descriptive ('Use WebPageTest to analyze page performance', 'Implement recommended optimizations including resource compression, caching') rather than concrete executable steps; the Quick Reference bullets are semi-specific but lack actual commands or examples.

2 / 3

Workflow Clarity

Check/Fix/Explain sections imply a review flow but there is no explicit sequenced process with validation checkpoints, so the sequence is present only implicitly.

2 / 3

Progressive Disclosure

The body is a concise overview that clearly signals a one-level-deep reference ('see references/rule.md' for full details), and that reference file exists, giving clean navigation.

3 / 3

Total

10

/

12

Passed

Description

75%

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 explicitly covers what the skill does and when to use it with an explicit trigger clause, and its WebPageTest anchoring makes it reasonably distinct. It is held back by a narrow action list and incomplete coverage of natural user trigger terms.

Suggestions

Expand the action list beyond 'review' and 'validate' to concrete capabilities like 'analyze waterfalls', 'flag render-blocking resources', or 'measure Core Web Vitals'.

Add the natural trigger terms users actually say — 'WebPageTest', 'page performance', 'page speed', 'Core Web Vitals' — alongside the existing template/HTML phrasing.

Tighten 'related to Analyze performance with WebPageTest' which reads as a title reference rather than a natural user phrase.

DimensionReasoningScore

Specificity

Names the domain ('reviewing templates, rendered HTML, or shared components') and concrete actions ('Validate the final browser-facing markup'), but the action list is narrow rather than a comprehensive set of multiple concrete capabilities.

2 / 3

Completeness

Explicitly answers both what ('Validate the final browser-facing markup, not just the source framework abstraction') and when ('Use when reviewing templates, rendered HTML, or shared components related to...'), with an explicit 'Use when' trigger clause.

3 / 3

Trigger Term Quality

Includes relevant developer terms ('templates, rendered HTML, shared components') but omits common user phrasings like 'WebPageTest', 'page performance', 'page speed', or 'render-blocking', so coverage of natural trigger terms is partial.

2 / 3

Distinctiveness Conflict Risk

Anchored to a specific named tool/rule (WebPageTest rendered-HTML review), giving it a clear niche unlikely to trigger for unrelated skills, despite the generic 'templates/shared components' phrasing.

3 / 3

Total

10

/

12

Passed

Validation

93%

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

Validation15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

metadata_version

'metadata.version' is missing

Warning

Total

15

/

16

Passed

Repository
thedaviddias/Front-End-Checklist
Reviewed

Table of Contents

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