[
  {
    "stage_index": 1,
    "name": "Failure Symptom Extraction",
    "action_type": "inspection",
    "description": "Extract failing test case details: input value, expected output, received output, stderr."
  },
  {
    "stage_index": 2,
    "name": "Root Cause Analysis (Thought Step)",
    "action_type": "calculation",
    "description": "Generate natural language diagnosis of algorithmic defect without altering code."
  },
  {
    "stage_index": 3,
    "name": "Targeted Code Surgery",
    "action_type": "code_modification",
    "description": "Rewrite specific functions or logic blocks to address the identified root cause."
  },
  {
    "stage_index": 4,
    "name": "Re-run Test Verification",
    "action_type": "output_validation",
    "description": "Run updated code against previously failing test and all previously passing tests."
  }
]