Borrowing it
Nothing to install: this file belongs to Harurow/j-quants-doc-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Harurow/j-quants-doc-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/Harurow/j-quants-doc-mcpWrote 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/instructions/harurow/j-quants-doc-mcp/claude-md)<a href="https://agentmods.dev/instructions/harurow/j-quants-doc-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/harurow/j-quants-doc-mcp/claude-md/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/instructions/harurow/j-quants-doc-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/harurow/j-quants-doc-mcp/claude-md.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 | $0.02942 | $0.02942 |
| Opus 5 | $0.01471 | $0.01471 |
| Sonnet 5 | $0.00588 | $0.00588 |
| Haiku 4.5 | $0.00294 | $0.00294 |
Grade A, and why
j-quants-doc-mcp CLAUDE.md 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
J-Quants API ドキュメント MCP サーバー（TypeScript 実装）の開発ガイド。
プロジェクト概要
J-Quants/j-quants-doc-mcp（Python 実装）を fork し、Node.js/TypeScript で書き直した MCP サーバー。 Claude Desktop・Cursor 等の AI クライアントから J-Quants API ドキュメントへアクセスする機能を提供する。
技術スタック
- ランタイム: Node.js 18+
- 言語: TypeScript 5.7+（strict モード）
- MCP SDK:
@modelcontextprotocol/sdk^1.12.1 - バリデーション:
zod^3.24.0 - テスト:
vitest^4.1.0 - 開発用実行:
tsx^4.19.0 - モジュール形式: ESM (
"type": "module","module": "Node16")
コマンド
npm install # 依存関係インストール
npm run build # tsc + src/data を dist/ にコピー
npm run dev # tsx で直接実行（開発用）
npm test # vitest run（全テスト実行）
npm start # node dist/index.js
ディレクトリ構成
src/
├── index.ts # MCP サーバー定義・7 つのツール実装
├── config.ts # spec_config.json のシングルトン読み込み
├── errors.ts # エラーレスポンスフォーマッタ（5 関数）
├── markdown-loader.ts # Markdown 取得・メモリ内キャッシュ
└── data/
├── spec_config.json # ベース URL・キャッシュ TTL・外部リンク定義
├── patterns.json # 実装パターンメタデータ
├── reference_data.json
└── templates/patterns/ # Python サンプルコード
tests/
├── helpers.ts # テストユーティリティ（mockFetch*, readFixture）
├── errors.test.ts # エラーフォーマッタ単体テスト
├── markdown-loader.test.ts # Markdown 取得・キャッシュテスト
├── tools.test.ts # ツール統合テスト
└── fixtures/ # テスト用 Markdown フィクスチャ
アーキテクチャと設計方針
モジュール責任分離
| モジュール | 責任 |
|---|---|
index.ts |
MCP ツール定義、ビジネスロジック、レスポンス組み立て |
config.ts |
設定読み込み（シングルトン）、環境変数上書き対応 |
errors.ts |
統一エラーレスポンス生成（format*Error 関数群） |
markdown-loader.ts |
HTTP fetch、メモリ内キャッシュ（TTL ベース）、外部リンク構築 |
MCP ツール一覧（7 つ）
| ツール | 概要 |
|---|---|
health_check |
サーバー健全性確認 |
search_endpoints |
V1/V2 エンドポイント検索 |
describe_endpoint |
エンドポイント詳細取得 |
get_pattern |
実装パターン・サンプルコード取得 |
fetch_spec_page |
任意パスの Markdown 取得 |
migrate_v1_to_v2 |
V1→V2 移行ガイド |
get_info |
契約・料金情報（外部リンク参照） |
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.
- 9d ago First seen · 229 lines · 2,942 tokens per session scan A 84d360c6b35a
j-quants-doc-mcp CLAUDE.md is an instructions file published in the GitHub repository Harurow/j-quants-doc-mcp (0 stars, last pushed 5mo ago), licensed MIT. It adds 2,942 tokens to every session, about $0.0147 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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