One idea: turn a light green when it's finished, and turn it red when it's working on something.

I tend to use the notepad command when I test parameters.

[repo path]\.claude\settings.json:

{
  "hooks": {
    "UserPromptSubmit": [
      {
        "hooks": [
          {
            "type": "mcp_tool",
            "server": "triggercmd",
            "tool": "run_command",
            "input": {
              "computer": "New Laptop",
              "command": "Notepad",
              "parameters": "started"
            }
          }
        ]
      }
    ],
    "Stop": [
      {
        "hooks": [
          {
            "type": "mcp_tool",
            "server": "triggercmd",
            "tool": "run_command",
            "input": {
              "computer": "New Laptop",
              "command": "Notepad",
              "parameters": "done"
            }
          }
        ]
      }
    ]
  }
}