Claude Code: Hooks システム

> Modify src/auth/jwt.ts

トリガーされたフック：
1. [before:tool:write] → jwt.ts を自動バックアップ
2. [ファイル書き込み完了]
3. [after:tool:write] → ESLint --fix を実行
4. [before:tool:bash] → コマンドの安全性をチェック
5. [実行: npm test]
6. [after:tool:bash] → テスト結果を解析
7. [after:response] → Slack 通知を送信

// ~/.claude/hooks.json
{
  "hooks": {
    "before:tool:write": [
      {
        "name": "auto-backup",
        "command": "cp ${filePath} ${filePath}.bak",
        "enabled": true
      }
    ],
    "after:tool:write": [
      {
        "name": "auto-format",
        "command": "npx prettier --write ${filePath}",
        "enabled": true
      }
    ]
  }
}

// .claude/hooks.json
{
  "hooks": {
    "before:tool:write": [
      {
        "name": "protect-config",
        "condition": "filePath.endsWith('.env')",
        "command": "echo 'Config file modification blocked' && exit 1",
        "enabled": true
      }
    ]
  }
}

{
  "hooks": {
    "before:tool:write": [
      {
        "name": "git-backup",
        "command": "git stash push -m 'auto-backup-before-claude' -- ${filePath} 2>/dev/null || true",
        "enabled": true
      }
    ]
  }
}

{
  "hooks": {
    "before:tool:bash": [
      {
        "name": "block-dangerous-commands",
        "condition": "command.includes('rm -rf') || command.includes('DROP TABLE')",
        "command": "echo '⚠️ Dangerous command blocked' && exit 1",
        "enabled": true
      }
    ]
  }
}

{
  "hooks": {
    "after:tool:write": [
      {
        "name": "auto-test",
        "condition": "filePath.includes('src/') && filePath.endsWith('.ts')",
        "command": "npm test 2>&1 | tail -5",
        "enabled": true
      }
    ]
  }
}

# フックデバッグを有効化
export CLAUDE_HOOK_DEBUG=1

# フック実行ログを確認
cat ~/.claude/hooks.log

# すべてのフックを一時的に無効化
claude --no-hooks

{
  "hooks": {
    "before:tool:write": [
      {
        "name": "auto-backup",
        "command": "cp ${filePath} /tmp/claude-backup/$(basename ${filePath}).$(date +%s)",
        "enabled": true
      },
      {
        "name": "protect-env",
        "condition": "filePath.endsWith('.env')",
        "command": "echo '❌ Env file modification blocked' && exit 1",
        "enabled": true
      }
    ],
    "after:tool:write": [
      {
        "name": "format",
        "command": "npx prettier --write ${filePath} 2>/dev/null; npx eslint --fix ${filePath} 2>/dev/null; true",
        "enabled": true,
        "files": ["src/**/*.ts"]
      }
    ],
    "before:tool:bash": [
      {
        "name": "block-dangerous",
        "condition": "command.match(/rm -rf|DROP|npm publish/)",
        "command": "echo '⛔ Dangerous command blocked' && exit 1",
        "enabled": true
      }
    ]
  }
}