Expert Skill Creator

<skill_scope skill="expert-skill-creator"> Related skills:

• skill-creator:skill-creator (Anthropic) - Basic skill mechanics, directory structure, initialization
• opinionated-software-engineering:software-engineer - Design principles that inform skill architecture
• opinionated-software-engineering:test-driven-development - Validation methodology parallels

This skill complements Anthropic's skill-creator:skill-creator skill. Load both when creating skills: skill-creator:skill-creator provides basic mechanics (e.g., directory structure, initialization scripts, packaging), while this skill provides expert-level guidance on content quality, structure, and validation.

Skills are modular packages that extend Claude's capabilities by providing specialized knowledge, workflows, and tool integrations. They function as retrieval triggers that activate and organize Claude's trained knowledge, not as teaching material that explains concepts from scratch.

Critical insight: For LLMs, skills activate existing knowledge rather than teaching new content. The risk is that too much detail constrains behavior rather than enhancing it. Skills should provide high-level frameworks that trigger trained knowledge, with detailed content reserved for genuinely novel or problematic areas.

Model calibration: This skill assumes Opus as the authoring model and targets created skills primarily at Opus and Fable. Fable 5 is new and capacity-limited as of June 2026; treat it as an upgrade path rather than a dependency (see <model_targeting>). For skills targeting Sonnet or Haiku tiers, see references/prompting-sonnet.md and references/prompting-haiku.md. </skill_scope>

When to Use This Skill