Module 04 — Skills, commands & plugins

Name: Harness Engineering — Claude Code Mastery
Price: 89 EUR
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In this module

Instead of repeating the same instructions at every session, you will know how to encapsulate them in commands. You will understand how a skill lets Claude automatically apply your architecture conventions without you having to remind them, and how a community-packaged plugin can deliver in 30 seconds a workflow that would have taken you hours to build.

Contents

4.1 — Anatomy of a slash command File format Command locations Key takeaways

4.2 — Dynamic arguments: $ARGUMENTS, $1, $2 The three forms of arguments Concrete example Combining with other syntaxes Key takeaways 4.3 — The @ syntax and file inclusion Basic usage Static paths Common use cases Key takeaways 4.4 — The ! syntax and inline bash execution How it works Combining with arguments Precautions Key takeaways 4.5 — The YAML frontmatter in detail Available fields allowed-tools patterns Key takeaways 4.6 — Organization and namespacing of commands Namespacing by directory Recommended organization strategy Project vs user commands Key takeaways 4.7 — Creating your first skill (SKILL.md) Structure of a skill Regles de dependance Conventions Skill vs Command Locations Key takeaways 4.8 — Anatomy of a Claude Code plugin Structure of a plugin The plugin.json manifest The ${CLAUDEPLUGINROOT} variable Optional components Key takeaways 4.9 — Plugin hooks: automating reactions Available events hooks.json structure Hook types Matcher Key takeaways 4.10 — Installing and managing plugins Installation Configuration in settings Custom marketplaces Security audit Key takeaways 4.11 — Creating a custom agent Structure of an agent Methodologie Contraintes Agent frontmatter options Launching Key takeaways 4.12 — Advanced patterns and composition Pattern 1: Command + Skill + Hook Pattern 2: Team plugin Pattern 3: Chained arguments Composition principles Key takeaways

4.1 — Anatomy of a slash command File format Command locations Key takeaways

4.1 — Anatomy of a slash command

Slash commands are Markdown files that Claude Code loads and runs as specialized prompts. Unlike native commands (/clear, /compact, /help), custom slash commands are files you create, share via Git, and use to encapsulate repeated workflows in a single invocation.

File format

A slash command is an .md file placed in one of the locations recognized by Claude Code. The file can start with an optional YAML frontmatter, followed by the Markdown content that forms the prompt:

```markdown

description: Génère un test unitaire pour le fichier cible

argument-hint: [file-path]

allowed-tools: Read, Write, Bash(npm:*)

Lis le fichier @$1 et génère un test unitaire complet.

Utilise le framework de tes

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