I did this as well, and loved to hear "Work complete!" (https://www.youtube.com/watch?v=bupagiROLV8) when Claude Code needed me.

Once the novelty wore off, I found it more useful to hear per-project, event-specific messages. On macOS, that looks like this:

    {
      "Stop": [
        {
          "hooks": [
            {
              "type": "command",
              "command": "osascript -e 'say \"ProjectX work complete\" volume 0.25' > /dev/null 2>&1 &"
            }
          ]
        }
      ],
      "Notification": [
        {
          "matcher": "permission_prompt",
          "hooks": [
            {
              "type": "command",
              "command": "osascript -e 'say \"ProjectX needs help\" volume 0.5' > /dev/null 2>&1 &"
            }
          ]
        }
      ]
    }