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.
git clone --depth 1 https://github.com/koizumikento/reinfolib-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/rules/koizumikento/reinfolib-mcp/mcp-server)<a href="https://agentmods.dev/rules/koizumikento/reinfolib-mcp/mcp-server"><img src="https://agentmods.dev/badge/rules/koizumikento/reinfolib-mcp/mcp-server/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/rules/koizumikento/reinfolib-mcp/mcp-server"><img src="https://agentmods.dev/badge/rules/koizumikento/reinfolib-mcp/mcp-server.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 | $0.00000 | $0.00548 |
| Opus 5 | $0.00000 | $0.00274 |
| Sonnet 5 | $0.00000 | $0.00110 |
| Haiku 4.5 | $0.00000 | $0.00055 |
Grade A, and why
mcp-server 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.
What it actually says
MCPサーバー実装ガイドライン
MCPサーバー設計方針
1. ツール定義
不動産情報ライブラリAPIの主要機能をMCPツールとして提供：
MCP_TOOLS = [
"reinfolib_search_real_estate", # 不動産価格検索
"reinfolib_get_municipalities", # 市区町村一覧取得
"reinfolib_get_land_price", # 地価公示・調査
"reinfolib_search_facilities", # 周辺施設検索
"reinfolib_get_urban_planning", # 都市計画情報
"reinfolib_get_disaster_risk", # 災害リスク情報
]
2. パラメータ検証
- 必須パラメータのバリデーション
- 地理座標の範囲チェック
- 日付形式の検証
3. レスポンス最適化
- 大きなGeoJSONデータの適切な分割
- バイナリデータの Base64 エンコーディング
- エラーメッセージの日本語対応
4. 設定管理
@dataclass
class ReinfliblibConfig:
api_key: str
base_url: str = "https://www.reinfolib.mlit.go.jp/ex-api/external"
timeout: int = 30
max_retries: int = 3
5. ログ出力
- APIリクエスト/レスポンスのログ
- エラー詳細のログ出力
- パフォーマンス計測
6. セキュリティ
- APIキーの安全な管理
- 入力パラメータのサニタイズ
- レート制限の遵守
7. MCPスキーマ定義
- JSON Schema による厳密なパラメータ定義
- 日本語説明文の提供
- 使用例の記載
8. エラー処理
- MCP準拠のエラーレスポンス
- APIエラーコードのMCPエラーへのマッピング
- ユーザーフレンドリーなエラーメッセージ
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 · 71 lines · 548 tokens per session scan A 354e750eca8f
mcp-server is a cursor rule published in the GitHub repository koizumikento/reinfolib-mcp (2 stars, last pushed 13d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 548 tokens. 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.
Other cursor rules, from other repositories
02-data-license
KKJ data usage and attribution.
00-project
JP Bids MCP project overview.
01-mcp-rules
MCP implementation rules.
swift-development
Swift development: SwiftUI, Combine, async/await, iOS patterns, and Apple platform conventions.
lighter-safety
Safety contract for the Lighter MCP server. Apply whenever a lighter tool is invoked.
nix-security
Nix Security and Sandboxing.