Ring Size Converter Skill

Overview

Ring Size Converter works by converting input sizes to diameter measurements, then calculating equivalent sizes in all supported regions. Can accept either standardized sizes or direct diameter measurements for maximum flexibility.

Live Test Ring Size Converter Skill Skill →

The tool

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

{
  "name": "RingSizeConverterSkill",
  "arguments": {
    "size": "7",
    "from": "us"
  }
}

You do not name the tool yourself; the model picks it. Asking about 7 in the terms this skill covers is enough for it to reach for RingSizeConverterSkill on its own — naming it explicitly also works, and is the way to force the call.

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, 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. Premium arguments are accepted on every plan but only take effect on plans that include them.

What the model gets back

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

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{
  "status": "ok",
  "error": null,
  "data": {
    "input_diameter_mm": 17.3,
    "circumference_mm": 54.3,
    "conversions": {
      "diameter_mm": 17.3,
      "circumference_mm": 54.3,
      "us": 7,
      "uk": "N",
      "eu": 52,
      "jp": 17,
      "ch": -22,
      "au": "N"
    },
    "note": "Sizes are approximate. For accurate sizing, visit a jeweler."
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Jewelry E-commerce

Help customers find their ring size when purchasing from international jewelers and retailers

Gift Shopping

Convert ring sizes when buying jewelry gifts for people in different countries

Jewelry Sizing

Provide sizing tools for jewelers working with international customers and standards

Size Guides

Create comprehensive ring size conversion charts for jewelry product listings

Other ways to use Ring Size Converter Skill

Set up Ring Size Converter 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.

Related

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