Skill Creation Guide

Scope

Use this skill when:

• Creating new Agent Skills
• Understanding SKILL.md format and conventions
• Learning best practices for skill authoring

Skill Structure

skill-name/
├── SKILL.md          # Required: Instructions and metadata
├── scripts/          # Optional: Helper scripts
├── templates/        # Optional: Document templates
└── resources/        # Optional: Reference files

SKILL.md Format

Required Frontmatter

---
name: my-skill-name
description: A clear description of what this skill does and when to use it.
---

Body Structure

# Skill Name

Detailed description of the skill's purpose.

## When to Use This Skill

- Use case 1
- Use case 2

## Instructions

[Detailed instructions for the agent]

## Examples

[Real-world examples]

Best Practices

1. Keep descriptions exhaustive: The frontmatter description helps agents decide when to trigger the skill.
2. Focus on execution: The body should contain clear, actionable steps.
3. Use progressive disclosure: Put detailed references in references/ folder.
4. Include scripts for automation: Use helper scripts for deterministic operations.
5. Keep SKILL.md under 500 lines: For optimal performance.
6. Test across platforms: Verify skills work with Claude Code, Codex, etc.

Token Efficiency

Skills employ progressive disclosure architecture:

1. Metadata loading (~100 tokens): Agent scans available skills
2. Full instructions (<5k tokens): Load when skill is activated
3. Bundled resources: Only load as needed

Platform-Specific Paths

Quality Checklist

• Clear, actionable instructions
• Includes real-world examples
• Written for AI agents, not end users
• Documents prerequisites and dependencies
• Includes error handling guidance
• Tested on target platform(s)