Borrowing it
Nothing to install: this file belongs to r3-yamauchi/mcp-server-blastengine-mailer. 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/r3-yamauchi/mcp-server-blastengine-mailer/main/CLAUDE.mdgit clone --depth 1 https://github.com/r3-yamauchi/mcp-server-blastengine-mailerWrote 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/r3-yamauchi/mcp-server-blastengine-mailer/claude-md)<a href="https://agentmods.dev/instructions/r3-yamauchi/mcp-server-blastengine-mailer/claude-md"><img src="https://agentmods.dev/badge/instructions/r3-yamauchi/mcp-server-blastengine-mailer/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/r3-yamauchi/mcp-server-blastengine-mailer/claude-md"><img src="https://agentmods.dev/badge/instructions/r3-yamauchi/mcp-server-blastengine-mailer/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 | $0.00511 | $0.00511 |
| Opus 5 | $0.00255 | $0.00255 |
| Sonnet 5 | $0.00102 | $0.00102 |
| Haiku 4.5 | $0.00051 | $0.00051 |
Grade A, and why
mcp-server-blastengine-mailer 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.
What it actually says
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
プロジェクト概要
このプロジェクトは、Blastengine APIを使用してメールを送信するMCP（Model Context Protocol）サーバーです。MCPサーバーとして動作し、LLM（大規模言語モデル）がメール送信機能を利用できるようにします。
開発コマンド
依存関係のインストール
npm install
ビルド
npm run build
開発モード（自動リビルド）
npm run watch
デバッグ（MCPインスペクター）
npm run inspector
アーキテクチャ
主要コンポーネント
- server.js: MCPサーバーのメインエントリーポイント
send_emailツールを実装- BlastEngineクライアントを使用してメール送信を処理
- STDIOトランスポートを使用してClaude Desktopと通信
技術スタック
- @modelcontextprotocol/sdk: MCPサーバーの実装に使用
- blastengine: メール送信APIクライアント
- Node.js ESモジュール:
"type": "module"として設定
重要な実装詳細
-
エラーハンドリング: メール送信失敗時は、エラーメッセージを含むレスポンスを返します（
isError: true）。 -
メール送信パラメータ:
to: 送信先メールアドレス（必須）from: 送信元メールアドレス（必須）subject: 件名（必須）text: 本文（必須）
Claude Desktop統合
このMCPサーバーをClaude Desktopで使用するには、設定ファイルにサーバー設定を追加する必要があります：
- macOS:
~/Library/Application Support/Claude/claude_desktop_config.json - Windows:
%APPDATA%/Claude/claude_desktop_config.json
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 · 62 lines · 511 tokens per session scan A 5a277d630b02
mcp-server-blastengine-mailer CLAUDE.md is an instructions file published in the GitHub repository r3-yamauchi/mcp-server-blastengine-mailer (0 stars, last pushed 1y ago), licensed MIT. It adds 511 tokens to every session, about $0.0026 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 2026-09-01.
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