{
  "approach": "Modify `_perturb_models` property to handle tuple `step_size` element-wise.\n\nPlanner dropped nonexistent files: [\"autofit/non_linear/grid/sensitivity.py\"]",
  "files_to_edit": [],
  "finish_reason": "stop",
  "hypothesis": "The bug occurs because when `step_size` is a tuple, `_perturb_models` tries to multiply a tuple by scalar `limit_scale`, causing a TypeError during division.",
  "retries": {},
  "usage": {
    "completion": 88,
    "prompt": 11037,
    "reasoning": 0
  }
}