gh-francyjglisboa-agent-skill-creator/docs/CLAUDE_SKILLS_ARCHITECTURE.md

Claude Skills Architecture: Complete Guide

🎯 Purpose

This document eliminates confusion between different types of Claude Code Skills and establishes consistent terminology.

📚 Standard Terminology

Skill

A Skill is a complete Claude Code capability implemented as a folder containing:

• SKILL.md file (required)
• Optional resources (scripts/, references/, assets/)
• Domain-specific functionality

Example: my-skill/ containing financial data analysis

Component Skill

A Component Skill is a specialized sub-skill that is part of a larger Skill Suite.

• Has its own SKILL.md
• Focuses on specific functionality
• Shares resources with other component skills

Example: data-acquisition/SKILL.md within a financial analysis suite

Skill Suite

A Skill Suite is an integrated collection of Component Skills that work together.

• Has marketplace.json as manifest
• Multiple specialized component skills
• Shared resources between skills

Example: Complete financial analysis suite with skills for data acquisition, analysis, and reporting.

Marketplace Plugin

A Marketplace Plugin is the marketplace.json file that hosts and organizes one or more Skills.

• NOT a skill - it's an organizational manifest
• Defines how skills should be loaded
• Can host simple skills or complex suites

🏗️ Architecture Types

Architecture 1: Simple Skill

my-skill/
├── SKILL.md              ← Single skill file
├── scripts/              ← Optional supporting code
├── references/           ← Optional documentation
└── assets/               ← Optional templates/resources

When to use:

• Focused, single functionality
• Simple workflow
• Less than 1000 lines of total code
• One main objective

Examples:

• Business proposal generator
• PDF data extractor
• ROI calculator

Architecture 2: Complex Skill Suite

my-suite/                       ← Complete Skill Suite
├── .claude-plugin/
│   └── marketplace.json        ← Skills manifest
├── component-1/                ← Component Skill 1
│   ├── SKILL.md
│   └── scripts/
├── component-2/                ← Component Skill 2
│   ├── SKILL.md
│   └── references/
├── component-3/                ← Component Skill 3
│   ├── SKILL.md
│   └── assets/
└── shared/                     ← Shared resources
    ├── utils/
    ├── config/
    └── templates/

When to use:

• Multiple related workflows
• Complex functionalities that need separation
• More than 2000 lines of total code
• Multiple interconnected objectives

Examples:

• Complete financial analysis suite
• Project management system
• E-commerce analytics platform

Architecture 3: Hybrid (Simple + Components)

my-hybrid-skill/               ← Main simple skill
├── SKILL.md                   ← Main orchestration
├── scripts/
│   ├── main.py               ← Main logic
│   └── components/           ← Specialized components
├── references/
└── assets/

When to use:

• Main functionality with sub-components
• Moderate complexity
• Centralized orchestration required

🔍 Deciding Which Architecture to Use

Use Simple Skill when:

• ✅ Clear main objective
• ✅ Linear and sequential workflow
• ✅ Less than 3 distinct subprocesses
• ✅ Code < 1000 lines
• ✅ One person can easily maintain

Use Complex Skill Suite when:

• ✅ Multiple related objectives
• ✅ Independent but connected workflows
• ✅ More than 3 distinct subprocesses
• ✅ Code > 2000 lines
• ✅ Team or complex maintenance

Use Hybrid when:

• ✅ Central orchestration is critical
• ✅ Components are optional/configurable
• ✅ Main workflow with specialized sub-tasks

📋 Marketplace.json Explained

The marketplace.json IS NOT a skill. It's an organizational manifest:

{
  "name": "my-suite",
  "plugins": [
    {
      "name": "component-1",
      "source": "./component-1/",
      "skills": ["./SKILL.md"]     ← Points to the actual skill
    },
    {
      "name": "component-2",
      "source": "./component-2/",
      "skills": ["./SKILL.md"]     ← Points to another skill
    }
  ]
}

Analogy: Think of marketplace.json as a book index - it's not the content, just organizes and points to the chapters (skills).

🚫 Terminology to Avoid

To avoid confusion:

❌ "Plugin" to refer to individual skills ✅ "Component Skill" or "Skill Suite"

❌ "Multi-plugin architecture" ✅ "Multi-skill suite"

❌ "Plugin marketplace" ✅ "Skill marketplace" (when hosting skills)

✅ Correct Terms

Situation	Correct Term	Example (with -cskill convention)
Single file with capability	Simple Skill	pdf-generator-cskill/SKILL.md
Specialized sub-capability	Component Skill	data-extraction-cskill/SKILL.md
Set of capabilities	Skill Suite	financial-analysis-suite-cskill/
Organizational file	Marketplace Plugin	marketplace.json
Complete system	Skill Ecosystem	Suite + Marketplace + Resources

🏷️ Naming Convention: The "-cskill" Suffix

Purpose of the "-cskill" Suffix

• Clear Identification: Immediately indicates it's a Claude Skill
• Defined Origin: Created by Agent-Skill-Creator
• Consistent Standard: Professional convention across all documentation
• Avoids Confusion: Distinguishes from manual skills or other sources
• Easy Organization: Simple identification and grouping

Naming Rules

1. Standard Format

{descriptive-description}-cskill/

2. Simple Skills

pdf-text-extractor-cskill/
csv-data-cleaner-cskill/
weekly-report-generator-cskill/
image-converter-cskill/

3. Complex Skill Suites

financial-analysis-suite-cskill/
e-commerce-automation-cskill/
research-workflow-cskill/
business-intelligence-cskill/

4. Component Skills (within suites)

data-acquisition-cskill/
technical-analysis-cskill/
reporting-generator-cskill/
user-interface-cskill/

5. Formatting

• ✅ Always lowercase
• ✅ Use hyphens to separate words
• ✅ Descriptive and clear
• ✅ End with "-cskill"
• ❌ No underscores or spaces
• ❌ No special characters (except hyphens)

Transformation Examples

User Requirement	Generated Name
"Extract text from PDF documents"	pdf-text-extractor-cskill/
"Clean CSV data automatically"	csv-data-cleaner-cskill/
"Complete financial analysis platform"	financial-analysis-suite-cskill/
"Generate weekly status reports"	weekly-report-generator-cskill/
"Automate e-commerce workflows"	e-commerce-automation-cskill/

🎯 Golden Rule

If it has SKILL.md → It's a Skill (simple or component) If it has marketplace.json → It's a marketplace plugin (organization)

📖 Real-World Examples

Simple Skill: Business Proposal

business-proposal/
├── SKILL.md              ← "Create business proposals"
├── references/
│   └── template.md
└── assets/
    └── logo.png

Complex Skill Suite: Financial Analysis

financial-analysis-suite/
├── .claude-plugin/marketplace.json
├── data-acquisition/SKILL.md    ← "Download market data"
├── technical-analysis/SKILL.md  ← "Analyze technical indicators"
├── portfolio-analysis/SKILL.md  ← "Optimize portfolio"
└── reporting/SKILL.md          ← "Generate reports"

Both are legitimate Claude Code Skills - just with different complexity levels.

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🔄 How This Document Helps

1. Clear terminology - Everyone uses the same terms
2. Informed decisions - Know when to use each architecture
3. Effective communication - No ambiguity between skills and plugins
4. Consistent documentation - Standard across all agent-skill-creator documentation

Result: Less confusion, more clarity, better development!