color-expert

Color science expert skill with 286K words of reference material covering OKLCH/OKLAB, palette generation, accessibility/contrast, color naming, pigment mixing, and historical color theory.

Quality

58%

Does it follow best practices?

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Securityby

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./skills/color-expert/SKILL.md

Quality

Content

50%

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

This is a thin catalogue pointer rather than a runnable skill: the body is concise and well-structured but provides no executable guidance and ships none of the reference material it advertises. It works as an index entry but fails as actionable instruction.

Suggestions

Either bundle the upstream references/scripts locally or replace the 'inspect the README' hand-wave with concrete install/clone commands and verified paths.

Add a minimal executable quick-start (e.g. a working OKLCH palette or contrast-check snippet) so the skill is usable without leaving SKILL.md.

Clarify the install workflow with explicit checkpoints (verify bundle present, confirm skill registered) before asking the agent to invoke it.

Dimension	Reasoning	Score
Conciseness	The body is lean and assumes Claude's competence — it avoids explaining what color science is and every line carries information, matching the 'lean and efficient' anchor.	3 / 3
Actionability	It offers no concrete executable code or commands, only 'open https://github.com/...' and 'ask the agent to invoke this skill by name', which describes rather than instructs — the vague/abstract anchor.	1 / 3
Workflow Clarity	A loose sequence is present (inspect README, install bundle, invoke by name/trigger), but steps are shallow with no validation checkpoints; below the explicit-checklist anchor yet above missing/unclear.	2 / 3
Progressive Disclosure	Sections are well-organized, but the advertised '286K words of reference material' is not bundled here and no references/scripts/assets exist, so the disclosure promise is only partially realized.	2 / 3
	Total	8 / 12 Passed

Description

67%

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 is specific and distinctive about its color-science niche but stops short of an explicit 'Use when...' trigger clause, relying on a separate triggers list for when-guidance. Tightening completeness would push it from good to excellent.

Suggestions

Add an explicit 'Use when ...' clause to the description covering palette generation, contrast/accessibility checks, and color-theory questions so when-guidance is self-contained.

Broaden the trigger terms with common phrasings users actually say (e.g. 'color picker', 'accessible colors', 'WCAG contrast', 'color scheme').

Dimension	Reasoning	Score
Specificity	Lists multiple concrete domains — 'OKLCH/OKLAB, palette generation, accessibility/contrast, color naming, pigment mixing, and historical color theory' — matching the anchor for several specific concrete actions rather than vague language.	3 / 3
Completeness	It clearly answers 'what' but lacks an explicit 'Use when...' clause; the when-guidance exists only as a separate triggers list, so per the rubric guideline completeness is capped at 2.	2 / 3
Trigger Term Quality	The frontmatter triggers ('color theory', 'palette generator', 'color science', 'oklch palette', 'contrast check') are reasonably natural, but common user variations are missing and the description field itself contains no trigger keywords.	2 / 3
Distinctiveness Conflict Risk	It carves a clear niche (color science / OKLCH) with distinct triggers, making it unlikely to fire for an unrelated skill.	3 / 3
	Total	10 / 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: skills/color-expert/SKILL.md
Commit: f2760fd

Reviewed: about 15 hours ago

Table of Contents

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