[
  {
    "stage_index": 1,
    "name": "Draft Code Generation (Node: generate)",
    "action_type": "code_modification",
    "description": "LLM generates initial Python function and test harness based on user requirements."
  },
  {
    "stage_index": 2,
    "name": "Import & Syntax Validation (Node: check_imports)",
    "action_type": "inspection",
    "description": "Deterministic Python AST parse tree verification to detect missing imports and syntax errors."
  },
  {
    "stage_index": 3,
    "name": "Pytest / Ruff Execution (Node: check_execution)",
    "action_type": "output_validation",
    "description": "Run generated code and unit tests inside an isolated sandbox subprocess, capturing exit code and stderr."
  },
  {
    "stage_index": 4,
    "name": "Conditional Routing Edge (Edge: decide_to_finish)",
    "action_type": "stop_evaluation",
    "description": "If exit code is 0 and no syntax errors, route to END. If errors exist and retries < max_retries, route to generate with traceback."
  }
]