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skill-creator

Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.

89

1.87x
Quality

87%

Does it follow best practices?

Impact

88%

1.87x

Average score across 3 eval scenarios

SecuritybySnyk

Low

Low-risk findings worth noting

The canonical home for this skill is skill-creator in anthropics/skills

SKILL.md
Quality
Evals
Security

Quality

Content

85%

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

The content is a strong, highly actionable workflow document with excellent sequencing and validation checkpoints and clean progressive disclosure to real reference files. Its main weakness is conciseness: conversational filler and repeated restatements of the core loop add tokens without adding guidance.

Suggestions

Remove conversational filler ('Cool? Cool.', the 'plumbers... grandparents' anecdote, 'we are trying to create billions a year in economic value here!') and the trailing re-emphasis of the core loop to reduce token load.

Consolidate the repeated statements of the create→test→review→improve loop (it appears in the intro, the 'How to think about improvements' section, and the closing recap) into a single canonical statement.

DimensionReasoningScore

Conciseness

The body is efficient and largely avoids explaining concepts Claude already knows, but it carries a fair amount of chatty padding ('Cool? Cool.', 'If you haven't heard (and how could you, it's only very recently that it started)...', 'we are trying to create billions a year in economic value here!') and redundant restatements of the core loop that could be tightened.

2 / 3

Actionability

It provides concrete, executable guidance throughout — exact commands (python -m scripts.aggregate_benchmark, generate_review.py with full flags), copy-paste-ready subagent task templates, and specific JSON field names ('text', 'passed', 'evidence') — matching the fully executable anchor.

3 / 3

Workflow Clarity

The eval/iterate loop is laid out as an explicitly sequenced five-step process with validation checkpoints (capture timing as notifications arrive, grade against assertions, run the analyst pass), feedback loops (fix and re-validate), and clear termination criteria, matching the level-3 anchor.

3 / 3

Progressive Disclosure

SKILL.md is an overview that clearly signals one-level-deep references to real bundle files (agents/grader.md, agents/comparator.md, agents/analyzer.md, references/schemas.md) with guidance on when to read them, and the referenced files exist in the bundle (references/schemas.md is present), matching the well-signaled reference anchor.

3 / 3

Total

11

/

12

Passed

Description

90%

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 strong: it states concrete capabilities, provides explicit 'Use when...' trigger guidance, and stakes out a clear, non-conflicting niche. It is slightly verbose and the listed actions are high-level rather than a comprehensive set of concrete operations, which keeps specificity from reaching the top anchor.

Suggestions

Tighten the description by trimming the parenthetical 'run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy' into a shorter parallel list of concrete actions to lift specificity.

Consider adding the natural term 'skill' reviews' or 'improve my skill' phrasings to broaden trigger coverage of the modify/improve path.

DimensionReasoningScore

Specificity

It lists several concrete actions ('Create new skills, modify and improve existing skills, and measure skill performance') plus specific sub-tasks ('run evals', 'benchmark skill performance with variance analysis', 'optimize a skill's description for better triggering accuracy'), but the actions are high-level workflow verbs rather than a comprehensive enumeration of concrete operations, sitting between the anchor for 2 and the multi-action 3 anchor.

2 / 3

Completeness

It explicitly answers both what the skill does and when to use it via the 'Use when users want to...' clause with concrete triggering contexts, matching the level-3 anchor.

3 / 3

Trigger Term Quality

It includes a rich set of natural user phrases ('create a skill from scratch, edit, or optimize an existing skill', 'run evals', 'benchmark skill performance', 'optimize a skill's description for better triggering accuracy') that users would actually type, giving good coverage of natural terms.

3 / 3

Distinctiveness Conflict Risk

The skill-creator niche is clearly staked out (skill authoring, evals, benchmarking, description optimization) with distinct triggers that are unlikely to conflict with other skills.

3 / 3

Total

11

/

12

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
av/harbor
Reviewed

Table of Contents

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