# WORN Fit (remote · worn.club)

Tells an AI assistant how a watch fits a given wrist, with a to-scale drawing. Free, no sign-in.

- Trust score: 78/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `worn.club`: 78/100 (this document), [markdown](https://verifymcp.io/servers/arthexai-worn-fit/worn.md), [page](https://verifymcp.io/servers/arthexai-worn-fit/worn)

## Channel facts

- Endpoint: `https://worn.club/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `2.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 79/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 714 tokens (~142/item across 5 items; 4 tools + 1 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 33/100
  - Stability observed for 10 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 83% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).
  - Supports UI / widget rendering.

## Install

### How do I install the WORN Fit MCP server?

WORN Fit is a hosted endpoint at https://worn.club/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http arthexai-worn-fit 'https://worn.club/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "arthexai-worn-fit": {
      "url": "https://worn.club/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "arthexai-worn-fit": {
      "type": "http",
      "url": "https://worn.club/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.arthexai-worn-fit]
url = "https://worn.club/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "arthexai-worn-fit": {
      "type": "remote",
      "url": "https://worn.club/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add arthexai-worn-fit --url 'https://worn.club/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  arthexai-worn-fit:
    url: "https://worn.club/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "arthexai-worn-fit": {
      "Transport": "http",
      "Url": "https://worn.club/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add arthexai-worn-fit -t streamable-http -u 'https://worn.club/mcp'
```

### Other

```json
{
  "mcpServers": {
    "arthexai-worn-fit": {
      "type": "http",
      "url": "https://worn.club/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-03 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 74, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-26 (score 74)

First indexed and scored.

## MCP tools (4)

### `fit_watch` (~161 tokens)

Fit watches to a wrist

How one to three watches fit a wrist of a given size, checked against WORN's catalogue of 46,000 watches (case, thickness, lug width): how far each watch's lugs stop from the edges of the wrist, whether it wears bigger or smaller than its case, and how it sits under a shirt cuff. Returns the verdicts in words, a link to the watches drawn to scale on the wrist, and the drawing as a card where cards are shown. Names are matched as people say them; case_mm and lug_to_lug_mm, when known, make the answer exact.

Input parameters:

- `watches` (array, required)
- `wrist_mm` (number, required): Wrist circumference in mm, measured where a watch sits (17 cm is 170)

### `suggest_sizes` (~62 tokens)

Watch sizes for a wrist

The case diameters and lug-to-lug spans that fit a wrist of a given circumference, and why lug to lug matters more than the case.

Input parameters:

- `wrist_mm` (number, required): Wrist circumference in mm, measured where a watch sits (17 cm is 170)

### `start_try_on` (~253 tokens)

Measure the wrist and try watches on

For a person who does not know their wrist size, or wants to see watches on their own wrist. Makes a link, with a QR code for a computer, that opens on their phone: the back camera measures the wrist in a few seconds with no tape or coin, then draws each watch on a photo of their own wrist at true size, to switch between. Nothing of the picture leaves the phone; tapping Send shares only the size and the watch they liked, which get_try_on_result returns with the code. Up to three watches; the link works for an hour. A picture of each watch can come as a link in image_url (a cutout with a transparent background, or the maker's or a shop's product photo on a plain white or grey background, which WORN cuts out) or as an uploaded file in photos; WORN shows it on the wrist at true size in place of its drawing.

Input parameters:

- `photos` (array): Pictures of the watches the person uploaded, straight on, to draw on their wrist in place of the drawing: a cutout, or the watch on a plain background, which WORN cuts out
- `watches` (array, required): The watches to try on

### `get_try_on_result` (~72 tokens)

Get the measured wrist

The wrist size the person measured with their phone through a try-on link (start_try_on), the watch they liked best, and how each watch fits that wrist. Says when they have not sent it yet, or when the link has expired.

Input parameters:

- `code` (string, required): The code start_try_on returned

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/arthexai-worn-fit/worn#diagnostics

## Score history

- 2026-11-05: 78
- 2026-11-04: 78
- 2026-11-03: 78
- 2026-11-02: 77
- 2026-11-01: 77
- 2026-10-31: 76
- 2026-10-30: 76
- 2026-10-29: 75
- 2026-10-28: 75
- 2026-10-27: 74
- 2026-10-26: 74

## Common questions

### What is the WORN Fit MCP server?

WORN Fit is an MCP server listed in the public MCP registry as io.github.arthexai/worn-fit. Tells an AI assistant how a watch fits a given wrist, with a to-scale drawing. Free, no sign-in. This page covers its hosted endpoint (https://worn.club/mcp).

### Is the WORN Fit MCP server safe to use?

WORN Fit scores 78 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the WORN Fit MCP server expose?

WORN Fit exposes 4 tools: fit_watch, suggest_sizes, start_try_on, get_try_on_result. Their descriptions and schemas cost roughly 548 tokens of context every time the server is loaded.

### Does the WORN Fit MCP server require authentication?

No. We connected to WORN Fit without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the WORN Fit MCP server still maintained?

WORN Fit is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://worn.club/mcp
- Website: https://worn.club/for-agents
- Changelog RSS feed: https://verifymcp.io/servers/arthexai-worn-fit/worn.xml
- Changelog JSON feed: https://verifymcp.io/servers/arthexai-worn-fit/worn.json
- HTML version of this page: https://verifymcp.io/servers/arthexai-worn-fit/worn