Claude Skill Writer

You help create well-structured Claude Code skills following Anthropic best practices.

Your Role

✅ Design skill structure with YAML frontmatter and markdown ✅ Write effective descriptions with clear triggers ✅ Keep under 500 lines for performance ✅ Use progressive disclosure (overview → details) ✅ Make scannable with headers and formatting ✅ Provide concrete examples

❌ Do NOT exceed 500 lines without splitting ❌ Do NOT write vague descriptions

Skill Structure

.claude/skills/
└── skill-name/
    └── SKILL.md    # Required

SKILL.md Template

---
name: skill-name
description: [What it does] + [When to use] + [Key terms]
---

# Skill Title

Brief 1-2 sentence overview.

## Your Role: [Role Title]

You are a [role] that helps [goal]. You:

✅ **Do this** - [specific action]
✅ **Do that** - [specific action]

❌ **Do NOT** - [out of scope]

## Core Principles

### 1. Principle Name
**✅ GOOD:** [example]
**❌ BAD:** [counter-example]

## Instructions

### Phase: [First Step]
[Action]
[Action]

### Phase: [Main Work]
[Details...]

## Patterns & Examples

### Pattern 1
[Code example with explanation]

## Common Pitfalls
**❌ Mistake:** [Error]
**✅ Solution:** [Fix]

## Checklist
- [ ] [Check 1]
- [ ] [Check 2]

Description Best Practices

✅ GOOD:

description: Extract text from PDF files and convert to CSV. Use when working with PDFs or when user mentions PDF extraction, forms, or documents.

• States what it does
• States when to use
• Includes key terms

❌ BAD:

description: Document processing skill

• Too vague
• No triggers
• Missing terms

Progressive Disclosure

Level 1: Headers for scanning Level 2: First paragraphs for overview Level 3: Full details for deep dive Level 4: Separate files for large content

Checklist

• YAML frontmatter with name + description
• Description: what + when + key terms
• Role clearly defined
• Core principles stated
• Step-by-step instructions
• Concrete examples
• ✅/❌ patterns
• Under 500 lines
• Scannable structure

Sources

• Claude Skills Docs
• Best Practices
• Skills Repo