skill-creator

Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.

1.27x

Quality

76%

Does it follow best practices?

Impact

97%

1.27x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./skill-creator/SKILL.md

Quality

Content

77%

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

This is a comprehensive, well-structured skill with excellent workflow clarity and actionability. The step-by-step process is clearly sequenced with validation checkpoints, and concrete examples are provided throughout. However, the skill is verbose for its purpose—much of the detailed reference material (frontmatter fields, inline vs fork decision matrix) could be moved to reference files to keep SKILL.md leaner.

Suggestions

Move the detailed YAML frontmatter reference table and inline vs fork decision guide to separate reference files (e.g., references/frontmatter_reference.md, references/context_decision_guide.md) and link to them from SKILL.md

Trim explanatory content like 'Think of them as onboarding guides' and 'What Skills Provide' section—Claude understands these concepts

Consider splitting the 'Anatomy of a Skill' section into a separate reference file since it's detailed documentation rather than procedural workflow

Dimension	Reasoning	Score
Conciseness	The skill contains some unnecessary explanations (e.g., 'Think of them as onboarding guides') and could be tightened in places, but overall provides substantial value. Some sections like 'What Skills Provide' explain concepts Claude likely understands.	2 / 3
Actionability	Provides concrete, executable guidance throughout: specific bash commands for packaging/validation, exact YAML frontmatter examples, clear script invocations like `scripts/init_skill.py <skill-name> --path <output-directory>`, and copy-paste ready code blocks.	3 / 3
Workflow Clarity	Excellent multi-step workflow with clear sequencing (Steps 1-9), explicit validation checkpoints (Step 6 security review, Step 7 packaging validation), and feedback loops ('If validation fails... fix and run again'). Includes decision guides for critical choices like inline vs fork.	3 / 3
Progressive Disclosure	References external files appropriately (references/sanitization_checklist.md, external Anthropic docs), but the SKILL.md itself is quite long (~400+ lines) with detailed content that could be split into reference files. The inline vs fork decision guide and frontmatter reference could be separate documents.	2 / 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 adequately communicates its purpose and includes explicit 'when to use' guidance, which is a strength. However, it lacks specific concrete actions that would help Claude understand the full scope of what this skill enables, and could benefit from additional natural trigger terms users might employ when seeking help with skill creation.

Suggestions

Add specific concrete actions like 'write YAML frontmatter', 'define trigger conditions', 'structure skill markdown content', 'validate skill format'

Include additional trigger term variations such as 'SKILL.md', 'skill file', 'new capability', 'teach Claude', 'custom workflow'

Dimension	Reasoning	Score
Specificity	Names the domain (creating skills) and mentions some actions ('create a new skill', 'update an existing skill'), but lacks concrete specific actions like 'write YAML frontmatter', 'define trigger conditions', or 'structure skill content'.	2 / 3
Completeness	Clearly answers both what ('Guide for creating effective skills') and when ('when users want to create a new skill or update an existing skill that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations').	3 / 3
Trigger Term Quality	Includes relevant keywords like 'skill', 'create', 'update', but misses common variations users might say such as 'write a skill', 'new capability', 'skill file', 'SKILL.md', or 'extend Claude'.	2 / 3
Distinctiveness Conflict Risk	Has a clear niche focused specifically on skill creation/modification, with distinct triggers around 'skill' and 'extends Claude's capabilities' that are unlikely to conflict with other skills.	3 / 3
	Total	10 / 12 Passed

Validation

90%

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 — 10 / 11 Passed

Validation for skill structure

Criteria	Description	Result
skill_md_line_count	SKILL.md is long (533 lines); consider splitting into references/ and linking	Warning

	Total	10 / 11 Passed

Repository: fernandezbaptiste/claude-code-skills
Commit: 4f0eae8

Reviewed: 4 months ago

Table of Contents

Discovery Implementation Validation

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