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jgrants-mcp: Instructions file for Claude Code

CLAUDE.md

jgrants-mcp CLAUDE.md is an instructions file for Claude Code from 42tahara/jgrants-mcp. It costs 2,912 tokens per session, scanned A, original, MIT.

Repository instructions for an MCP server that lets AI assistants search and retrieve Japanese government grants from Jグランツ, Japan's online subsidy application system.

In plain words
What is it for?
Use it when modifying the server, its grant-search features, documentation, or development workflow.
Why use it?
It tells the agent which documentation to read for setup, usage, or development and helps it follow the project's API and document structure.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is 42tahara/jgrants-mcp's own configuration. It tells Claude Code how to work on jgrants-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything jgrants-mcp configures →

not rated 0repo 1mo ago A scan 2,912 tokens original MIT
View source ↗ 42tahara/jgrants-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to 42tahara/jgrants-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.

Copy the file
curl -O https://raw.githubusercontent.com/42tahara/jgrants-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/42tahara/jgrants-mcp

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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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.

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<a href="https://agentmods.dev/instructions/42tahara/jgrants-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/42tahara/jgrants-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,912 This file is loaded in full into every session.
When invoked 2,912 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.02912 $0.02912
Opus 5 $0.01456 $0.01456
Sonnet 5 $0.00582 $0.00582
Haiku 4.5 $0.00291 $0.00291

Measured 9d ago against content hash c802e24c70ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

jgrants-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.

CLAUDE.md · 211 lines

How it starts

The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

対象読者: Claude Code (AI)

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

ドキュメント構成

このプロジェクトには対象読者別に4つのドキュメントがあります：

📕 CLAUDE.md（このファイル - AI向け）

  • 配置: プロジェクトルート
  • 対象: Claude Code（あなた）
  • 目的: プロジェクトの概要、アーキテクチャ、よく使うコマンド
  • 参照タイミング: 常に最初に読む

📘 docs/README.md（ユーザー向け - 完全版）

  • 配置: docs/ ディレクトリ
  • 対象: Jグランツ補助金情報を検索・取得したいユーザー
  • 目的: セットアップ方法、基本的な使い方、ツール一覧
  • 参照タイミング: ユーザーが「使い方」「セットアップ方法」を質問した時
  • 注意: プロジェクトルートにも簡易版 README.md があります（GitHub表示用）

📗 docs/EXAMPLES.md（ユーザー向け）

  • 配置: docs/ ディレクトリ
  • 対象: Jグランツ補助金情報を検索・取得したいユーザー
  • 目的: 具体的な使用例、実践的なクエリパターン
  • 参照タイミング: ユーザーが「どう使えばいいか」「具体例を教えて」と質問した時

📙 docs/DEVELOPMENT.md（開発者向け）

  • 配置: docs/ ディレクトリ
  • 対象: プロジェクトを改良・拡張したい開発者
  • 目的: 開発環境詳細、アーキテクチャ設計の背景、API仕様完全版、新機能追加ガイド
  • 参照タイミング: コード変更・機能追加・バグ修正を行う時、技術的な詳細が必要な時

重要: コード変更や新機能追加の際は、必ず docs/DEVELOPMENT.md を参照すること。API仕様の完全なリスト（全21フィールド、null頻度統計）、docstringのベストプラクティス、開発ワークフローが記載されています。

プロジェクト概要

このプロジェクトは、デジタル庁の補助金電子申請システム「Jグランツ」の公開APIをラップしたModel Context Protocol (MCP) サーバーの実装です。Claude DesktopなどのLLMが自然言語で補助金・助成金情報を検索・取得できるようにします。

デジタル庁の記事 MCP活用したJグランツ補助金検索システムの実装例 を参考に実装されています。

コアAPIエンドポイント: https://api.jgrants-portal.go.jp/exp/v1/public/subsidies

よく使うコマンド

セットアップとインストール

# 仮想環境の作成
python3 -m venv venv

# 仮想環境の有効化 (macOS/Linux)
source venv/bin/activate

# 依存関係のインストール
pip install -r requirements.txt

開発とテスト

# MCPサーバーの包括的検証（サーバー構造、登録済みツール、関数定義を一括確認）
python tests/test_mcp_server.py

# 開発モードで実行（MCP Inspectorを使用したブラウザベースのテスト）
fastmcp dev jgrants_mcp_server.py
# ブラウザで http://localhost:6274 を開く

MCPサーバーの実行

このサーバーは直接実行するのではなく、Claude Desktopの設定経由で実行するように設計されています。MCP通信にはstdio転送を使用します。

アーキテクチャ

コア構造

  • 単一ファイルサーバー: jgrants_mcp_server.py にすべてのMCPツール実装が含まれている
  • フレームワーク: FastMCP 2.13.0（PythonでMCPサーバーを構築するためのフレームワーク）
  • HTTPクライアント: httpx（非同期サポート付き）
  • 転送方式: stdio ベースのMCP通信（HTTPサーバーではない）

Read the full file on GitHub · 211 lines

Changes

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.

  1. 9d ago First seen · 211 lines · 2,912 tokens per session scan A c802e24c70ee

Subscribe to this mod's changes

jgrants-mcp CLAUDE.md is an instructions file published in the GitHub repository 42tahara/jgrants-mcp (0 stars, last pushed 1mo ago), licensed MIT. It adds 2,912 tokens to every session, about $0.0146 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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