write-a-skill

name	write-a-skill
description	Guide la création d'un nouveau skill d'agent IA pour le dépôt foundation-skills. Génère le squelette du SKILL.md et du fichier docs, applique les conventions du dépôt (frontmatter, versionnage, structure). À utiliser quand l'utilisateur demande de créer un nouveau skill, écrire un skill, ajouter un skill ou générer le squelette d'un skill.
version	1.2.0
license	MIT

Write a Skill

Create a new skill for the foundation-skills repository following all repo conventions.

Workflow

Step 1: Gather requirements

Ask the user:

• What task or domain does the skill cover?
• What specific use cases should it handle?
• What triggers should activate it? (keywords, phrases, file types)
• Any reference materials to include?

Step 2: Choose a skill name

• Use lowercase kebab-case (e.g., my-new-skill)
• Keep it short and descriptive
• Verify the name is not already taken in skills/

Step 3: Create skills/<name>/SKILL.md

Start from skills/_TEMPLATE/SKILL.md but apply these mandatory conventions:

Frontmatter (YAML):

---
name: <skill-name>
description: <what it does>. Use when <triggers>.
version: 1.0.0
---

• name, description, version are required and at root level (not nested under metadata)
• description max 1024 characters. First sentence: what it does. Second sentence: "Use when [triggers]."
• version starts at 1.0.0 for new skills
• SKILL.md is written in English

Body rules:

• Keep SKILL.md under 100 lines — concise, actionable instructions only
• Use progressive disclosure: put detailed content in reference/ files
• Include concrete examples
• No time-sensitive information
• If the skill requires external CLI tools (e.g., gh, glab, jq, playwright), add a ## Prerequisites section listing each tool with its install command. If the tool is not already handled by skills/setup/reference/setup.sh, add it there and bump setup's version (the setup script is maintained manually).

Step 4: Create reference files (if needed)

If content exceeds 100 lines or has distinct domains, split into:

skills/<name>/
├── SKILL.md
└── reference/
    ├── detailed-guide.md
    └── examples.md

Reference from SKILL.md: See [detailed guide](reference/detailed-guide.md)

Step 5: Create docs/<name>.md

Create the matching documentation file in French. It must include:

• Title (skill name)
• Description section
• Cas d'usage (use cases)
• Declenchement (triggers)
• Fonctionnement (how it works)
• Exemples (examples in both English and French)
• Version number

See existing files in docs/ for style reference.

Step 6: Review checklist

• skills/<name>/SKILL.md exists with valid frontmatter (name, description, version at root)
• Description includes triggers ("Use when...")
• Description under 1024 characters
• SKILL.md under 100 lines
• SKILL.md written in English
• docs/<name>.md exists, written in French
• No time-sensitive info, consistent terminology
• Concrete examples included
• Reference files only one level deep
• If external CLI tools are required, a ## Prerequisites section is present with install commands
• If the skill requires a new CLI tool not already handled by setup.sh, add it to skills/setup/reference/setup.sh and bump setup's version

Versioning rules

When modifying an existing skill, bump its version field:

• patch (1.0.0 -> 1.0.1): typo fixes, wording improvements, minor clarifications
• minor (1.0.0 -> 1.1.0): new features, new sections, meaningful behavior changes
• major (1.0.0 -> 2.0.0): breaking changes (renamed skill, removed features, restructured workflow)

Important Notes

• Every skill lives in skills/<name>/SKILL.md; documentation in docs/<name>.md (in French)
• The description field is the only thing the agent sees when choosing which skill to load — make it count
• Scripts are discouraged; prefer Markdown instructions. Add scripts only for deterministic operations