Body Metrics MCP

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "height",
    "weight",
    "sex",
    "age"
  ],
  "properties": {
    "age": {
      "type": "number",
      "description": "Years, 15-100. Outside that the equations do not apply."
    },
    "sex": {
      "enum": [
        "male",
        "female"
      ],
      "type": "string",
      "description": "Required by the BMR equations, which are fitted separately."
    },
    "height": {
      "type": "string",
      "description": "Height WITH a unit. Accepts 178cm, 1.78m, 5'10\", 5 ft 10 in, 70in. A bare number is REFUSED because it is ambiguous."
    },
    "weight": {
      "type": "string",
      "description": "Weight WITH a unit. Accepts 75kg, 165lb, 11st 8lb. A bare number is REFUSED."
    },
    "activity": {
      "enum": [
        "sedentary",
        "light",
        "moderate",
        "active",
        "extreme"
      ],
      "type": "string",
      "description": "Activity band, default sedentary. This is the LARGEST source of error in the estimate — most people overestimate. If between two bands, take the lower."
    },
    "targetBmi": {
      "type": "number",
      "description": "Target BMI, 15-40, to compute a goal weight."
    },
    "proteinGoal": {
      "enum": [
        "maintenance",
        "active",
        "strength",
        "deficit"
      ],
      "type": "string",
      "description": "Which protein guidance range to report. Default maintenance."
    },
    "bodyFatPercent": {
      "type": "number",
      "description": "Optional but worth supplying: adds the Katch-McArdle estimate, which uses lean mass, and moves the protein target onto lean mass."
    },
    "dailyDeficitKcal": {
      "type": "number",
      "description": "Daily deficit, to estimate a timeline. The timeline is a lower bound."
    }
  }
}

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