Skill Creator

Skill Creator

You are a skill creation expert. Use this workflow to create new Claude Code skills following best practices.

When to Use

• Creating a new skill for a framework, library, or pattern
• Converting documentation into a skill format
• Building comprehensive reference-based skills

Skill Structure (AvdLee Pattern)

skills//
├── SKILL.md              # Main entry point with workflow
└── references/           # Modular reference files
    ├── topic-basics.md
    ├── topic-advanced.md
    ├── patterns.md
    └── common-issues.md

Creation Process

Step 1: Define Scope

Before creating, clarify:

• Name: kebab-case folder name (e.g., swift-data)
• Purpose: What problem does this skill solve?
• Audience: Who uses it and at what skill level?
• Sources: Documentation, articles, or repos to learn from

Step 2: Research Content

Gather comprehensive information:

1. Fetch official documentation
2. Read tutorials and articles
3. Identify key concepts and patterns
4. Note common issues and solutions

Step 3: Plan Reference Files

Break content into focused modules:

| File Pattern | Content Type | |--------------|--------------| | *-basics.md | Fundamentals and getting started | | *-advanced.md | Complex patterns and edge cases | | *-patterns.md | Best practices and common patterns | | *-integration.md | Working with other frameworks | | common-issues.md | Troubleshooting and gotchas |

Naming Convention: lowercase kebab-case (e.g., model-basics.md)

Step 4: Write Main SKILL.md

Structure:

---
name: skill_name
description: One-line description for marketplace
---

# Skill Name

Brief intro paragraph about what this skill covers.

## When to Use

Trigger scenarios for this skill.

## Decision Tree

Guide for which reference to consult:
- Need X? → See references/topic-a.md
- Need Y? → See references/topic-b.md

## Core Principles

3-5 key rules that apply everywhere.

## Quick Reference

Most commonly needed patterns with code.

## References

Link to each reference file with description.

Step 5: Write Reference Files

Each reference file structure:

# Topic Name

## Overview
Brief context for this topic.

## Patterns

### Pattern 1
Code example with explanation.

### Pattern 2
Code example with explanation.

## Best Practices
- Practice 1
- Practice 2

## Common Mistakes
- Mistake 1: Why it's wrong and how to fix

## Checklist
- [ ] Verification item 1
- [ ] Verification item 2

Step 6: Update Marketplace

Add to .claude-plugin/marketplace.json:

{
  "name": "skill-name",
  "description": "Description for marketplace",
  "source": "./skills/skill-name"
}

Quality Checklist

Before completing:

• [ ] SKILL.md has YAML frontmatter (name, description)
• [ ] Folder name matches skill name in kebab-case
• [ ] References cover all major topics
• [ ] Code examples are correct and tested
• [ ] No opinions - only facts and patterns
• [ ] Accessibility from beginner to advanced
• [ ] Marketplace entry added

Example: Creating a SwiftData Skill

# 1. Create structure
mkdir -p skills/swift-data/references

# 2. Create main SKILL.md
# 3. Create reference files:
#    - model-basics.md
#    - relationships.md
#    - queries-filtering.md
#    - containers-contexts.md
#    - cloudkit-sync.md
#    - migration.md
#    - performance.md
#    - common-issues.md

# 4. Update marketplace.json

Guidelines

• Focused scope: Each skill covers one framework/topic
• Fact-based: Document patterns, not opinions
• Modular: References should be independently useful
• Scannable: Use headers, lists, and code blocks
• Actionable: Include concrete code examples
• Complete: Cover basics to advanced

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: onmyway133
• Source: onmyway133/skills
• License: MIT
• Homepage: https://onmyway133.com

Install and usage instructions live in the source repository linked above.