{
  "context": "This criteria evaluates how well the engineer uses Textual's reactive programming system to implement an automatically updating task counter application. It focuses specifically on the use of reactive attributes, computed properties, and watchers.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Reactive attributes",
      "description": "Uses the `reactive` descriptor from `textual.reactive` to declare `completed` and `pending` attributes that automatically trigger UI updates when modified.",
      "max_score": 25
    },
    {
      "name": "Computed property implementation",
      "description": "Implements a `compute_total()` method that automatically calculates the total number of tasks from completed and pending counts.",
      "max_score": 20
    },
    {
      "name": "Percentage computed property",
      "description": "Implements a `compute_percentage()` method that calculates completion percentage, handling the edge case of zero tasks by returning '0.0%'.",
      "max_score": 20
    },
    {
      "name": "Reactive configuration",
      "description": "Properly configures reactive attributes with appropriate options (e.g., `layout=True` or `repaint=True`) to trigger UI updates automatically.",
      "max_score": 15
    },
    {
      "name": "Widget composition",
      "description": "Uses appropriate widgets (Static, Label, or similar) in the `compose()` method to display the reactive values (completed, pending, total, percentage).",
      "max_score": 10
    },
    {
      "name": "Key binding integration",
      "description": "Implements key press handlers that modify reactive attributes, demonstrating that changes to reactive values automatically propagate to the UI.",
      "max_score": 10
    }
  ]
}