{
  "schema_version": "1.0",
  "request": "生成中心距120mm、大头孔36mm、小头孔20mm、厚14mm的发动机连杆，导出STEP和STL，后续可以修改参数",
  "route": {
    "selected_backend": "build123d",
    "runner_skill": "cad",
    "confidence": "high",
    "fallback_order": [
      "simplecadapi",
      "cadam"
    ],
    "decision_path": "route-decision.json"
  },
  "source": {
    "path": "connecting_rod.py",
    "format": "python",
    "backend": "build123d"
  },
  "artifacts": [
    {
      "path": "connecting_rod.step",
      "role": "primary"
    },
    {
      "path": "connecting_rod.stl",
      "role": "secondary"
    },
    {
      "path": "connecting_rod_20260722T071141Z.png",
      "role": "verification_snapshot"
    }
  ],
  "parameters": {
    "center_distance_mm": 120.0,
    "thickness_mm": 14.0,
    "big_end_outer_diameter_mm": 56.0,
    "big_end_bore_diameter_mm": 36.0,
    "small_end_outer_diameter_mm": 36.0,
    "small_end_bore_diameter_mm": 20.0,
    "web_width_mm": 24.0,
    "pocket_depth_each_side_mm": 3.0
  },
  "assumptions": [
    "This V1 sample demonstrates routing and editability rather than a production-rated engine component.",
    "Material, fatigue loads, bearing fits, lubrication, fasteners, tolerances, and split big-end construction are intentionally out of scope."
  ],
  "validation": [
    {
      "check": "closed solid count",
      "result": 1,
      "status": "pass"
    },
    {
      "check": "bounding box millimeters",
      "result": [
        166.0,
        56.0,
        14.0
      ],
      "status": "pass"
    },
    {
      "check": "volume cubic millimeters",
      "result": 50729.813,
      "status": "pass"
    },
    {
      "check": "bore radii millimeters",
      "result": [
        10.0,
        18.0
      ],
      "status": "pass"
    },
    {
      "check": "STEP topology",
      "result": {
        "shape_count": 1,
        "face_count": 18,
        "edge_count": 42,
        "warnings": []
      },
      "status": "pass"
    },
    {
      "check": "isometric snapshot review",
      "result": "Both bores, the connected web, and the top pocket are visibly present; no disconnected body is visible.",
      "status": "pass"
    }
  ],
  "viewer_links": [
    "http://127.0.0.1:4178/?dir=%2FUsers%2Fjerry%2Flinkhand%2FCadSet%2Ftext-to-cad%2Fmodels%2Fcad-router-v1&file=connecting_rod.step"
  ]
}