Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add khalilbenaz/claude-skills-collection --skill claude-code-extension-buildergit clone --depth 1 https://github.com/khalilbenaz/claude-skills-collectionWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/khalilbenaz/claude-skills-collection/claude-code-extension-builder)<a href="https://agentmods.dev/skills/khalilbenaz/claude-skills-collection/claude-code-extension-builder"><img src="https://agentmods.dev/badge/skills/khalilbenaz/claude-skills-collection/claude-code-extension-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/khalilbenaz/claude-skills-collection/claude-code-extension-builder"><img src="https://agentmods.dev/badge/skills/khalilbenaz/claude-skills-collection/claude-code-extension-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00076 | $0.01941 |
| Opus 5 | $0.00038 | $0.00971 |
| Sonnet 5 | $0.00015 | $0.00388 |
| Haiku 4.5 | $0.00008 | $0.00194 |
Grade D, and why
claude-code-extension-builder scanned grade D with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
**Fichier :** `.claude/settings.json` (projet) ou `~/.claude/settings.json` (global). Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
- `PreToolUse` + `Bash` → bloquer des commandes dangereuses (`rm -rf`). How it starts
The opening of the file, as written. The whole thing — 252 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Code Extension Builder
Critères de décision — quel type d'extension créer ?
| Besoin | Type d'extension |
|---|---|
| Réutiliser un workflow de prompt | Skill (SKILL.md) |
| Déclencher une action sur événement Claude | Hook (.claude/settings.json) |
| Exposer un outil externe (DB, API, fs) | Serveur MCP |
| Composer plusieurs skills en une commande | Slash command custom |
Workflow en étapes
1. Analyser le besoin
- Identifier le workflow répétitif ou l'outil à connecter.
- Répondre à : déclenchement automatique ou à la demande ? sortie texte, fichier, ou action ?
- Choisir le type (tableau ci-dessus) avant toute implémentation.
2. Créer un Skill (SKILL.md)
Structure minimale obligatoire :
---
name: mon-skill # kebab-case, unique dans la collection
description: Une ligne, termine avec les phrases de déclenchement entre guillemets. Se déclenche avec "mot-clé A", "mot-clé B".
---
# Mon Skill
## Workflow
1. **Étape 1** — description actionnable.
2. **Étape 2** — ...
## Règles
- Règle 1 (obligatoire, concise).
Bonnes pratiques :
name= identifiant technique → dossieragent-skills/<category>/<name>/SKILL.md.description: ≤ 2 phrases ; les triggers entre guillemets couvrent les synonymes naturels de l'utilisateur.- Corps : 80-180 lignes, pas de section
## Communication Rules(ajoutée automatiquement). - Langue : français, termes techniques en anglais.
Arborescence collection :
agent-skills/
dev/
mon-skill/
SKILL.md
devops/
...
3. Configurer des Hooks
Les hooks interceptent les événements Claude Code pour automatiser des actions.
Fichier : .claude/settings.json (projet) ou ~/.claude/settings.json (global).
{
"hooks": {
"PreToolUse": [
{
"matcher": "Bash",
"hooks": [
{
"type": "command",
"command": "echo '[hook] commande bash interceptée'"
}
]
}
],
"PostToolUse": [
{
"matcher": "Write",
"hooks": [
{
"type": "command",
"command": "npx prettier --write $CLAUDE_TOOL_INPUT_FILE_PATH"
}
]
}
],
"Stop": [
{
"hooks": [
{
"type": "command",
"command": "node scripts/notify-slack.js"
}
]
}
]
}
}
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 252 lines · 76 tokens per session scan D 63e482da91de
claude-code-extension-builder is a skill published in the GitHub repository khalilbenaz/claude-skills-collection (22 stars, last pushed 18d ago), licensed MIT. It adds 76 tokens to every session and 1,941 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it D with 2 findings (reads agent configuration directories, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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