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 thkt/dotclaude --skill use-context-reviewer-securitygit clone --depth 1 https://github.com/thkt/dotclaudeWrote 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/thkt/dotclaude/use-context-reviewer-security)<a href="https://agentmods.dev/skills/thkt/dotclaude/use-context-reviewer-security"><img src="https://agentmods.dev/badge/skills/thkt/dotclaude/use-context-reviewer-security/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/thkt/dotclaude/use-context-reviewer-security"><img src="https://agentmods.dev/badge/skills/thkt/dotclaude/use-context-reviewer-security.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 | $0.00049 | $0.01871 |
| Opus 5.5 | $0.00020 | $0.00748 |
| Sonnet 5.5 | $0.00010 | $0.00374 |
| Haiku 4.5 | $0.00005 | $0.00187 |
Grade A, and why
use-context-reviewer-security scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
| A10 | SSRF | `fetch(userInputUrl)` | URL バリデーション、許可リスト | How it starts
The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.
use-context-reviewer-security
検出 (OWASP Top 10)
LLM01 は信頼できないコンテンツを LLM に渡すアプリを対象とする。sink はプロンプトそのものであり、データと指示の境界なく連結された信頼できないテキストや、システムプロンプトに補間された呼び出し側の値が該当する。fetch_url のような LLM ツールは、A10 SSRF など非 LLM の対応物と同じように制約する。sink はツールであってプロンプトではない。
| ID | カテゴリ | パターン | 修正 |
|---|---|---|---|
| LLM01 | Prompt Injection (LLM) | RAG ドキュメント・取得コンテンツ・ツール結果・role 引数など、信頼できない値や呼び出し側が制御する値が、データとしての枠付けなしにプロンプトへ到達 | 信頼できないコンテンツをデータとして区切る。呼び出し側の値は固定の列挙された指示にマッピングする |
| A01 | Broken Access Control | 認証なし、IDOR、path traversal | 認証ミドルウェア、所有権チェック |
| A01 | CSRF | 状態変更リクエスト (POST/PUT/PATCH/DELETE) に CSRF トークン検証なし | Double Submit Cookie |
| A01 | Open Redirect (Taint) | URL パラメータ → location.href でバリデーションなし |
ドメイン許可リストまたは相対のみ |
| A02 | Cryptographic Failures | password: 'plaintext' |
bcrypt/argon2 ハッシュ化 |
| A02 | Timing Attack | トークン/署名の === 比較 |
定数時間比較。全バイトを XOR し最後に判定 |
| A02 | Sensitive Data Exposure | localStorage/sessionStorage に保存された JWT | httpOnly cookie に置き換える |
| A03 | Injection | db.query(\SELECT...${id}`)` |
パラメータ化クエリ、ORM |
| A03 | Injection | exec(\ping ${host}`)` |
入力バリデーション、ライブラリで代替 |
| A03 | XSS | 静的に存在する dangerouslySetInnerHTML |
デフォルト エスケープ、DOMPurify |
| A03 | XSS (Taint) | サニタイザなしの dangerouslySetInnerHTML={{ __html }} |
境界で DOMPurify.sanitize() を呼ぶ |
| A03 | XSS (Taint) | 関数引数 → innerHTML でサニタイズなし |
関数境界でサニタイズ |
| A03 | XSS (Taint) | ユーザー制御 URL を持つ <a href={variable}> |
https/http のみのプロトコル許可リスト |
| A04 | Insecure Design | origin チェックなしの postMessage ハンドラ |
event.origin の厳密比較 |
| A05 | Security Misconfiguration | cors({ origin: '*' }) |
明示的な origin 許可リスト |
| A05 | Security Misconfiguration | オプションなしの cookie: {} |
secure, httpOnly, sameSite: 'strict' |
| A05 | Security Misconfiguration | エラー応答の err.stack で NODE_ENV ガードなし |
本番では汎用メッセージ、内部だけにログ |
| A07 | Authentication Failures | 認証エンドポイント (login, register, password-reset) にレート制限なし | auth ルートグループに rate limiter ミドルウェア |
| A08 | Prototype Pollution | ...body スプレッドでリクエストオブジェクト構築 |
明示的なフィールド代入 |
| A09 | Logging Failures | logger.info({ password }) |
センシティブ フィールドを除外 |
| A10 | SSRF | fetch(userInputUrl) |
URL バリデーション、許可リスト |
What ships with it
8 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.
- 1mo ago First seen · 72 lines · 49 tokens per session scan A fb513fcb138a
use-context-reviewer-security is a skill published in the GitHub repository thkt/dotclaude (12 stars, last pushed 25d ago), licensed MIT. It adds 49 tokens to every session and 1,871 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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