{
  "name": "unit_convert",
  "description": "Convertit superficies, longueurs et prix unitaires (m² ↔ pi², hectare, acre, arpent carré québécois, m ↔ pi ↔ po, $/m² ↔ $/pi²). Déterministe, avec la formule.",
  "parameters": {
    "type": "object",
    "properties": {
      "value": { "type": ["number", "string"] },
      "from_unit": { "type": "string", "description": "m2, pi2, ha, acre, arpent, km2, m, pi, po, cm, km, $/m2, $/pi2, $/acre…" },
      "to_unit": { "type": "string" }
    },
    "required": ["value", "from_unit", "to_unit"]
  }
}