{
  "endpoint": "/api/water-intake-calculator",
  "method": "GET",
  "description": "Calculates daily target hydration volume.",
  "parameters": {
    "weightKg": { "type": "number", "required": true },
    "climate": { "type": "string", "enum": ["hot", "cold", "temperate"], "required": true },
    "exerciseHours": { "type": "number", "required": true }
  },
  "sample_response": {
    "ml": 3100,
    "liters": 3.1,
    "glasses": 12
  }
}