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/crearize/ai-dev-helm/frontend-developmentnpx skills add Crearize/ai-dev-helm --skill frontend-developmentgit clone --depth 1 https://github.com/Crearize/ai-dev-helmWhat 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 | $0.00032 | $0.00461 |
| Opus 5 | $0.00016 | $0.00230 |
| Sonnet 5 | $0.00006 | $0.00092 |
| Haiku 4.5 | $0.00003 | $0.00046 |
Grade A, and why
frontend-development 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
Frontend Development Skill - フロントエンド開発
禁止事項（最重要）
以下は絶対に禁止。違反は許容されない。
- any型使用禁止:
unknown型を使用（TypeScript の場合） - React.forwardRef使用禁止: 将来非推奨化予定（React の場合）
コンポーネント設計
UIライブラリ優先
新規コンポーネント作成前に、プロジェクトで採用しているUIライブラリの既存コンポーネントで要件を満たせるか確認。
状態管理
プロジェクトで採用している状態管理ライブラリに従う。
非同期処理ガイドライン
- async/await優先: Promiseチェーン（
.then()）は避ける - 独立した非同期処理はPromise.allで並列実行
- エラーハンドリング: try-catch + 適切なUI表示
テスト方針: 仕様ベーステスト
- テストは実装の内部状態ではなく、機能要件に基づいて設計する
- useState等の内部stateを直接検証しない
- Testing Libraryのロールベースセレクタ優先（
getByRole>getByTestId） - モック対象は外部依存（API、ブラウザAPI等）に限定する
実装完了時の必須チェック
プロジェクトの CLAUDE.md に定義されたフロントエンド品質チェックコマンドを実行する。
参照ドキュメント
- フロントエンド規約:
documents/development/coding-rules/frontend-rules.md - 開発ガイドライン:
documents/development/development-policy.md
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 · 46 lines · 32 tokens per session scan A 127d9646c511
frontend-development is a skill published in the GitHub repository Crearize/ai-dev-helm (4 stars, last pushed 8d ago), licensed MIT. It adds 32 tokens to every session and 461 once invoked, about $0.0002 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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