Skill Creator
This skill provides guidance for creating effective skills.
About Skills
Skills are modular, self-contained packages that extend Claude's capabilities by providing specialized knowledge, workflows, and tools. Think of them as "onboarding guides" for specific domains or tasks—they transform Claude from a general-purpose agent into a specialized agent equipped with procedural knowledge that no model can fully possess.
What Skills Provide
- •Specialized workflows - Multi-step procedures for specific domains
- •Tool integrations - Instructions for working with specific file formats or APIs
- •Domain expertise - Company-specific knowledge, schemas, business logic
- •Bundled resources - Scripts, references, and assets for complex and repetitive tasks
Core Principles
Concise is Key
The context window is a public good. Skills share the context window with everything else Claude needs: system prompt, conversation history, other Skills' metadata, and the actual user request.
Default assumption: Claude is already very smart. Only add context Claude doesn't already have. Challenge each piece of information: "Does Claude really need this explanation?" and "Does this paragraph justify its token cost?"
Prefer concise examples over verbose explanations.
Set Appropriate Degrees of Freedom
Match the level of specificity to the task's fragility and variability:
- •High freedom (text-based instructions): Use when multiple approaches are valid, decisions depend on context, or heuristics guide the approach.
- •Medium freedom (pseudocode or scripts with parameters): Use when a preferred pattern exists, some variation is acceptable, or configuration affects behavior.
- •Low freedom (specific scripts, few parameters): Use when operations are fragile and error-prone, consistency is critical, or a specific sequence must be followed.
Anatomy of a Skill
Every skill consists of a required SKILL.md file and optional bundled resources:
skill-name/
├── SKILL.md (required)
│ ├── YAML frontmatter metadata (required)
│ │ ├── name: (required)
│ │ └── description: (required)
│ └── Markdown instructions (required)
└── Bundled Resources (optional)
├── scripts/ - Executable code (Python/Bash/etc.)
├── references/ - Documentation intended to be loaded into context as needed
└── assets/ - Files used in output (templates, icons, fonts, etc.)
Skill Creation Process
- •Understand the skill with concrete examples: Identify patterns and triggers.
- •Plan reusable skill contents: Scripts for automation, references for knowledge, assets for templates.
- •Initialize the skill: Run
scripts/init_skill.py <name> --path <location>. - •Edit the skill: Write SKILL.md and implement resources. Use imperative form.
- •Package the skill: Run
scripts/package_skill.py <path>. - •Iterate: Test on real tasks and refine.
Design Patterns
Refer to these guides for advanced implementations:
- •Multi-step processes: See references/workflows.md
- •Output quality standards: See references/output-patterns.md