BMI & Fitness Metrics Skill

The tool

Give your agent body metrics. Call it as an MCP tool to compute BMI, BMR, TDEE, calorie targets and macros from height, weight and age.

Once your client is connected to the VerveKit MCP server, this appears in its tool list as BMIFitnessMetricsSkill. It is read-only and open-world: it fetches, it never mutates anything on your side, so most clients will call it without asking you to confirm.

{
  "name": "BMIFitnessMetricsSkill",
  "arguments": {
    "weight": "180",
    "height": "70",
    "unit": "imperial"
  }
}

What that looks like in a conversation

You don't name the tool — the model picks it. Asking about 180 in the terms this source covers is enough for it to reach for BMIFitnessMetricsSkill on its own.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth — the client opens a browser once and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

https://api.vervekit.com/v1/mcp

Per-client setup — Claude Desktop, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made.

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client can read fields without parsing prose. status is "ok" on success and error is null; a null field means the value wasn't available for that input, not that the call failed.

{
  "status": "ok",
  "error": null,
  "data": {
    "height": "170 cm",
    "weight": "70 kg",
    "bmi": 24.221453287197235,
    "risk": "Low risk",
    "summary": "This weight is normal and you are healthy.",
    "recommendation": "A BMI between 18.5 and 24.9 falls within the 'normal' weight range according to the World Health Organization. This range is associated with the lowest health risk for conditions such as heart disease, diabetes, and certain cancers. However, it's important to note that BMI is not a perfect measure as it does not account for muscle mass, bone density, overall body composition, and racial and sex differences. Therefore, while it's a useful starting point, it should not be the only measure of one's health."
  }
}

Fields

Failure modes

Errors come back as tool errors with a sentence the model can act on, not a bare status code.

Other ways to use BMI & Fitness Metrics Skill

Set up BMI & Fitness Metrics Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Frequently asked questions