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 agentmods add skills/chachamaru127/codex-harness/authnpx skills add Chachamaru127/codex-harness --skill authgit clone --depth 1 https://github.com/Chachamaru127/codex-harnessWhat 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 | $0.00056 | $0.00880 |
| Opus 5 | $0.00028 | $0.00440 |
| Sonnet 5 | $0.00011 | $0.00176 |
| Haiku 4.5 | $0.00006 | $0.00088 |
Grade A, and why
auth scanned grade A with 0 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 2d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Auth Skills
認証と決済機能の実装を担当するスキル群です。
機能詳細
| 機能 | 詳細 |
|---|---|
| 認証機能 | See references/authentication.md |
| 決済機能 | See references/payments.md |
実行手順
- 品質判定ゲート（Step 0）
- ユーザーのリクエストを分類(認証 or 決済)
- 上記の「機能詳細」から適切な参照ファイルを読む
- その内容に従って実装
Step 0: 品質判定ゲート（セキュリティチェックリスト）
認証・決済機能は常にセキュリティリスクが高いため、作業開始前に必ず以下を表示:
🔐 セキュリティチェックリスト
この作業はセキュリティ上重要です。以下を確認してください：
### 認証関連
- [ ] パスワードはハッシュ化（bcrypt/argon2）
- [ ] セッション管理は安全か（HTTPOnly Cookie）
- [ ] CSRF 対策は実装されているか
- [ ] レート制限（ブルートフォース対策）
### 決済関連
- [ ] 機密情報（カード番号等）をサーバーに保存しない
- [ ] Stripe/決済プロバイダの SDK を正しく使用
- [ ] Webhook の署名検証
- [ ] 金額改ざん防止（サーバー側で金額を確定）
### 共通
- [ ] エラーメッセージが詳細すぎないか（情報漏洩防止）
- [ ] ログに機密情報を出力していないか
セキュリティ重要度表示
⚠️ 注意レベル: 🔴 高
この機能は以下のリスクがあります：
- 認証情報の漏洩
- 不正アクセス
- 決済の不正操作
専門家によるレビューを推奨します。
VibeCoder 向け
🔐 安全にログイン・決済機能を作るために
1. **パスワードは「ハッシュ化」する**
- 元のパスワードを復元できない形で保存
- 万が一データが漏れても安全
2. **カード情報はサーバーに保存しない**
- Stripe などの専用サービスに任せる
- 自分のサーバーには一切保存しない
3. **エラーメッセージは曖昧に**
- 「パスワードが違います」ではなく「認証に失敗しました」
- 悪意ある人にヒントを与えない
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 84 lines · 56 tokens per session scan A 23baefa8d531
auth is a skill published in the GitHub repository Chachamaru127/codex-harness (2 stars, last pushed 6mo ago), licensed MIT. It adds 56 tokens to every session and 880 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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