{
  "id": "hinge_leaf_barrel",
  "level": "easy",
  "family": "hardware",
  "prompt": "Design a simple door hinge as editable CadQuery. Include two hinge leaves, alternating barrel knuckles, a center pin, countersunk screw holes, and rounded leaf corners.",
  "image_prompt": "Realistic product render of a simple metal door hinge with two leaves, barrel knuckles, center pin, countersunk screw holes, and rounded corners, white background, no text.",
  "semantic_hints": [
    "hinge",
    "leaf",
    "barrel_knuckle",
    "center_pin",
    "countersunk_hole",
    "rounded_corner"
  ],
  "bbox_mm": [
    100,
    70,
    12
  ]
}