claude-code-monitor: Instructions file for Claude Code

CLAUDE.md

claude-code-monitor CLAUDE.md is an instructions file for Claude Code from onikan27/claude-code-monitor. It costs 1,332 tokens per session, scanned B, original, MIT.

A set of project instructions for a macOS command-line monitor that tracks multiple Claude Code sessions in real time.

In plain words
What is it for?
Use it to build, test, lint, type-check, or debug Claude Code monitoring and its hook event handling.
Why use it?
It documents the development commands, test methods, hook events, and files used to store session state and conversation histories.

Instructions file for Claude Code

Written for Claude Code: PreToolUse hook event. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

This is onikan27/claude-code-monitor's own configuration. It tells Claude Code how to work on claude-code-monitor 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 claude-code-monitor configures →

Reuse

Borrowing it

Nothing to install: this file belongs to onikan27/claude-code-monitor. 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/onikan27/claude-code-monitor/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/onikan27/claude-code-monitor

Made for: Claude Code.

Wrote 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.

agentmods badge for claude-code-monitor CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/onikan27/claude-code-monitor/claude-md/github.svg)](https://agentmods.dev/instructions/onikan27/claude-code-monitor/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/onikan27/claude-code-monitor/claude-md"><img src="https://agentmods.dev/badge/instructions/onikan27/claude-code-monitor/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.

agentmods 80×15 button for claude-code-monitor CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/onikan27/claude-code-monitor/claude-md"><img src="https://agentmods.dev/badge/instructions/onikan27/claude-code-monitor/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,332 This file is loaded in full into every session.
When invoked 1,332 The same file — it is already loaded in full.
Security scan B 1 finding. 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 $0.01332 $0.01332
Opus 5 $0.00666 $0.00666
Sonnet 5 $0.00266 $0.00266
Haiku 4.5 $0.00133 $0.00133

Measured 12d ago against content hash bff554340a5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade B, and why

claude-code-monitor CLAUDE.md scanned grade B 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 12d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

- `~/.claude/settings.json` - Claude Codeのフック設定(`ccm setup`で自動設定)
CLAUDE.md · 109 lines

How it starts

The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

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

Development Commands

npm run dev           # 開発モード(ホットリロード付き)
npm run build         # TypeScriptコンパイル
npm start             # コンパイル済みJSを実行

# テスト
npm run test          # テスト実行(単発)
npm run test:watch    # テスト実行(ウォッチモード)
npm run test:coverage # カバレッジ付きテスト
npx vitest tests/handler.test.ts           # 特定ファイルのテスト
npx vitest -t "updateSession"              # 特定テスト名で絞り込み

# コード品質
npm run lint          # biomeでリントチェック
npm run lint:fix      # リント自動修正
npm run format        # コードフォーマット
npm run typecheck     # 型チェックのみ

フックイベントのテスト

# stdinからJSONを渡してフック処理をテスト
echo '{"session_id":"test-123","cwd":"/tmp"}' | npx tsx src/bin/ccm.tsx hook PreToolUse

Architecture

Claude Codeの複数セッションをリアルタイム監視するmacOS専用CLIツール。Ink(React for CLI)を使用したTUIとファイルベースの状態管理で動作する。

重要なファイルパス

  • ~/.claude-monitor/sessions.json - セッション状態の永続化ファイル
  • ~/.claude/settings.json - Claude Codeのフック設定(ccm setupで自動設定)
  • ~/.claude/projects/*/TRANSCRIPT.md - 各セッションの会話履歴

データフロー

  1. Hook受信: Claude Codeがフックイベント(PreToolUse, PostToolUse, Notification, Stop, UserPromptSubmit)を発火
  2. 状態更新: ccm hook <event> コマンドがstdinからJSONを受け取り、~/.claude-monitor/sessions.json を更新
  3. UI更新: chokidarでファイル変更を検知し、Dashboardコンポーネントが再描画
  4. モバイルWeb同期: WebSocketで接続中のクライアントにセッション更新をブロードキャスト

ディレクトリ構成

  • src/bin/ccm.tsx - CLIエントリーポイント(Commanderでコマンド定義)
  • src/hook/handler.ts - フックイベント処理(stdin読み取り→状態更新)
  • src/store/file-store.ts - セッション状態の永続化(JSON読み書き、TTY生存確認)
  • src/setup/index.ts - ~/.claude/settings.json へのフック自動設定
  • src/server/index.ts - HTTP + WebSocketサーバー(モバイルWeb用)
  • src/components/ - InkベースのReactコンポーネント(Dashboard, SessionCard, Spinner)
  • src/hooks/useSessions.ts - ファイル変更監視付きのReactフック
  • src/hooks/useServer.ts - モバイルサーバー起動用フック
  • src/utils/focus.ts - AppleScriptによるターミナルフォーカス機能
  • src/utils/status.ts - ステータス表示ユーティリティ
  • src/types/index.ts - 型定義(HookEvent, Session, SessionStatus, StoreData)
  • public/index.html - モバイルWeb UI(静的HTML)

Read the full file on GitHub · 109 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. 12d ago First seen · 109 lines · 1,332 tokens per session scan B bff554340a5b

Subscribe to this mod's changes

claude-code-monitor CLAUDE.md is an instructions file published in the GitHub repository onikan27/claude-code-monitor (307 stars, last pushed 7mo ago), licensed MIT. It adds 1,332 tokens to every session, about $0.0067 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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