optimized

Use when reviewing image assets, markup, and CDN or build transforms related to Optimise images for faster loading. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.

Quality

74%

Does it follow best practices?

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Securityby

Passed

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tessl review fix ./skills/optimized/SKILL.md

Quality

Content

61%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.

The body is well-structured and actionable with specific encoder settings and a clean reference split, but it explains concepts Claude already knows and lacks an explicit validation checkpoint for a batch/de destructive re-encoding workflow.

Suggestions

Remove or trim the 'Explain' section (DCT/DEFLATE/EXIF fundamentals) — Claude already knows these; keep only any non-obvious project-specific nuance.

Add an explicit validation step to the Fix workflow, e.g. verify the re-encoded image has no visible quality loss and correct dimensions before replacing the original, with a retry-on-failure loop.

Convert the prose encoder specs into executable commands or a short code block in the body (or ensure rule.md's examples are surfaced as the primary fix recipe) so guidance is copy-paste ready.

Dimension	Reasoning	Score
Conciseness	Mostly efficient in the Quick Reference/Check/Fix sections, but the 'Explain' section restates concepts Claude already knows (DCT/DEFLATE compression, what EXIF metadata is) and the intro carries motivational padding ('A DSLR-quality JPEG... can be 8MB').	3 / 5
Actionability	Provides concrete tools and parameters (mozjpeg quality 80 progressive=true, pngquant 65-80, AVIF quality 60 effort 6, SVGO), but gives them as prose specs rather than copy-paste commands or code in the body, with execution deferred to references/rule.md.	4 / 5
Workflow Clarity	Numbered Check and Fix steps give a clear sequence, but this is a batch operation over all image assets with effectively destructive re-encoding and no explicit validation checkpoint (e.g. verify visual quality / confirm no upscale before replacing), which caps the score at 3 per the rubric.	3 / 5
Progressive Disclosure	Well-organised sections (Quick Reference, Check, Fix, Explain, Code Review) with a clearly signalled one-level-deep reference to a real references/rule.md for implementation details; the inline 'Explain' concept material is a minor organisation gap.	4 / 5
	Total	14 / 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 strong, well-structured description that explicitly covers both what to do and when to use it, with concrete actionable checks and a distinct niche. Its only weakness is slightly limited verb variety and a few missing common synonyms.

Dimension	Reasoning	Score
Specificity	Names the domain and lists several concrete actions ('Check encoded size, rendered size, loading strategy, and above-the-fold impact'), but verbs are limited to 'reviewing'/'check' rather than varied concrete operations, leaving minor coverage gaps.	4 / 5
Completeness	Explicitly answers both: 'what' via 'Check encoded size, rendered size, loading strategy, and above-the-fold impact together' and 'when' via the concrete 'Use when reviewing image assets, markup, and CDN or build transforms...' trigger phrase.	5 / 5
Trigger Term Quality	Good natural keyword coverage ('image assets', 'markup', 'CDN', 'build transforms', 'loading strategy', 'above-the-fold'), but common synonyms like 'compress', 'WebP', or 'lazy load' are missing.	4 / 5
Distinctiveness Conflict Risk	Occupies a clear niche (web image optimisation for performance) with distinct, specific triggers ('above-the-fold impact', 'CDN or build transforms') that minimise overlap with other skills.	5 / 5
	Total	18 / 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
metadata_version	'metadata.version' is missing	Warning

	Total	15 / 16 Passed

Repository: thedaviddias/Front-End-Checklist
Path: skills/optimized/SKILL.md
Commit: 30756a7

Reviewed: 26 days ago

Table of Contents

Discovery Implementation Validation

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