WORN Fit for ChatGPT and Claude
Get watch fit answers inside ChatGPT and Claude
Add WORN Fit to your assistant once. Then ask whether a watch suits your wrist and get a plain answer, with the watch drawn to scale. Free, with no sign-in.
Press Ask WORN Fit to see the answer.
This is the answer WORN Fit gives your assistant.
Add it with one prompt
Paste this into any coding agent, such as Claude Code, Codex or Cursor. It adds WORN Fit to the assistant it runs in.
Add the WORN Fit MCP server to the assistant you run in. It is a remote server over Streamable HTTP at https://worn.club/mcp, with no sign-in and no API key. Use your platform's way of adding a remote MCP server or connector, for example a config entry named worn-fit with type http and that URL. Tell me when it is added and whether I need to restart or approve anything. From then on, use WORN Fit whenever I ask whether a watch fits, what size watch suits me, or to see a watch on my wrist.
Or add it by hand
The address is the same everywhere: https://worn.club/mcp.
- Open Settings, then Connectors, then Add custom connector.
- Name it WORN Fit and paste the URL below.
- Turn the connector on in a chat.
https://worn.club/mcpWorks on claude.ai and the desktop app. The drawn card shows on the web; elsewhere the answer comes as text with a link to the drawing.
- Open Settings, then Apps and connectors, then Advanced settings, and turn on Developer mode.
- Create a connector, paste the URL below, and choose no authentication.
- Turn the connector on in a chat.
https://worn.club/mcpMenu names differ slightly by plan.
Run this once in your terminal.
claude mcp add --transport http worn-fit https://worn.club/mcpAdd this to the agent's MCP configuration. WORN Fit is a remote server over Streamable HTTP and needs no key.
{
"mcpServers": {
"worn-fit": { "type": "http", "url": "https://worn.club/mcp" }
}
}Then ask
Once it is connected, start a chat with this.
Use WORN Fit: does a 40 mm Black Bay suit my 17 cm wrist? Then show me how to measure my wrist.
What it can do
Fit a watch to a wrist
Says how a watch wears on a wrist: how far its lugs stop from the edges, how big it looks, how it sits under a cuff. It comes with a drawing to scale.
fit_watchSizes that suit a wrist
Gives the case sizes and lug-to-lug spans that fit a wrist, and says why lug to lug matters more than the case.
suggest_sizesMeasure the wrist and try watches on
Gives a link to open on a phone, where the camera measures the wrist and draws the watches on it.
start_try_onRead back the result
Brings the measured wrist and the favourite watch back into the chat, with how each watch fits.
get_try_on_result
For shops
With Boutique, a shop's own assistant connects with the shop's key and shows the shop's own photos and buy links on the shopper's wrist.
Questions
Does it cost anything?
No. WORN Fit for assistants is free, with no account, sign-in or API key.
Which assistants can use it?
Claude and ChatGPT, and any agent that can add a remote MCP server over Streamable HTTP, such as Claude Code. ChatGPT needs Developer mode turned on, which depends on the plan.
What does WORN receive?
The watch names and wrist size your assistant is asking about. A try-on keeps a short code and the measured wrist for an hour, so the assistant can read the result back. There is no account to tie it to.
Why does the answer sometimes come without a drawing?
Only some apps can show the drawn card, such as Claude on the web and ChatGPT. Elsewhere the answer is text with a link to the same drawing.