{
  "schema_version": "1.0",
  "request": "参考图片生成一个8孔圆法兰，中心孔直径20毫米，外径50毫米，厚度4毫米，螺丝孔使用M3",
  "route": {
    "selected_backend": "build123d",
    "runner_skill": "cad",
    "project": "text-to-cad",
    "fallback_order": [
      "simplecadapi",
      "cadam"
    ],
    "workflow_profiles": [
      "caddesigner_ecip",
      "requirement_refinement",
      "visual_repair"
    ],
    "downstream_skills": [
      "cad-viewer"
    ]
  },
  "source": {
    "path": "flange_8x_m3.py",
    "format": "python",
    "backend": "build123d"
  },
  "artifacts": [
    {
      "path": "flange_8x_m3.step",
      "role": "primary"
    },
    {
      "path": "flange_8x_m3.stl",
      "role": "secondary"
    }
  ],
  "parameters": {
    "outer_diameter_mm": 50.0,
    "inner_diameter_mm": 20.0,
    "thickness_mm": 4.0,
    "bolt_hole_count": 8,
    "bolt_hole_diameter_mm": 3.4,
    "bolt_circle_diameter_mm": 40.0,
    "angular_spacing_deg": 45.0
  },
  "assumptions": [
    "M3螺丝孔按普通间隙通孔处理，孔径采用3.4毫米，不是M3攻丝底孔。",
    "未指定分度圆，采用40毫米分度圆，以保持孔到外圆约3.3毫米的最小径向边距。",
    "参考图中的车削纹理作为外观参考，不生成削弱4毫米薄法兰的深槽。"
  ],
  "validation": [
    {
      "path": "validation.json",
      "status": "passed",
      "checks": {
        "step_valid": true,
        "solid_count": 1,
        "exact_size_mm": [50.0, 50.0, 4.0],
        "m3_clearance_hole_count": 8,
        "m3_clearance_hole_diameter_mm": 3.4,
        "bolt_circle_diameter_mm": 40.0,
        "angular_spacing_deg": 45.0,
        "visual_review": "passed_iso_opposite_top_front"
      }
    }
  ],
  "viewer_links": [
    "http://127.0.0.1:4178/?dir=%2FUsers%2Fjerry%2Flinkhand%2FCadSet%2Ftext-to-cad%2Fmodels%2Fcad-router-v1%2Fflange_8x_m3&file=flange_8x_m3.step"
  ]
}