{
  "schema_version": "1.0",
  "request": "生成模数2、20齿、12毫米厚、中心孔12毫米的人字齿轮，导出STEP并保留可重放模型图",
  "route": {
    "selected_backend": "simplecadapi",
    "runner_skill": "simplecadapi",
    "confidence": "high",
    "fallback_order": [
      "build123d",
      "cadam"
    ],
    "decision_path": "gear-route-decision.json"
  },
  "source": {
    "path": "herringbone_gear_simplecad.py",
    "format": "python",
    "backend": "simplecadapi",
    "replay_model": "herringbone_gear_simplecad.json"
  },
  "artifacts": [
    {
      "path": "herringbone_gear_simplecad.step",
      "role": "primary"
    },
    {
      "path": "herringbone_gear_simplecad.stl",
      "role": "secondary"
    },
    {
      "path": "herringbone_gear_simplecad_20260722T072647Z.png",
      "role": "verification_snapshot"
    }
  ],
  "parameters": {
    "teeth": 20,
    "module_mm": 2.0,
    "pressure_angle_deg": 20.0,
    "helix_angle_deg": 30.0,
    "height_mm": 12.0,
    "bore_diameter_mm": 12.0,
    "backlash_mm": 0.05
  },
  "validation": [
    {
      "check": "SimpleCAD operation graph nodes",
      "result": 270,
      "status": "pass"
    },
    {
      "check": "volume cubic millimeters",
      "result": 13213.684,
      "status": "pass"
    },
    {
      "check": "STEP topology",
      "result": {
        "shape_count": 1,
        "face_count": 963,
        "edge_count": 2043,
        "bounds_mm": [
          43.99775,
          43.99775,
          12.0
        ],
        "warnings": []
      },
      "status": "pass"
    },
    {
      "check": "isometric snapshot review",
      "result": "Twenty double-helical teeth, the center bore, and the herringbone ridge are visibly present.",
      "status": "pass"
    }
  ],
  "assumptions": [
    "This sample validates backend routing and parametric generation; it is not a rated transmission design.",
    "Material, heat treatment, profile shift, tolerance class, strength, lubrication, and mating gear checks remain out of scope."
  ],
  "viewer_links": [
    "http://127.0.0.1:4178/?dir=%2FUsers%2Fjerry%2Flinkhand%2FCadSet%2Ftext-to-cad%2Fmodels%2Fcad-router-v1&file=herringbone_gear_simplecad.step"
  ]
}