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.
Available components
Last scanned (21 hours ago)
Scores higher than 76% of remote servers
Reachable. Last reached 4 Nov 2026.
Category E-commerce
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. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability79
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management30
- Stability observed for 9 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage94
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 83% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
- Supports UI / widget rendering.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Nov 26 +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.
- 1 Nov 26 +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.
- 30 Oct 26 +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.
- 28 Oct 26 +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.
- 27 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 26 Oct 26 74
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Probed https://worn.club/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=worn.club | CN=YR2,O=Let's Encrypt,C=US | 21 Sept 2026 | 20 Dec 2026 | RSA 2048 | SHA256-RSA | 6b14fe7d711b1ce726e1f7d58ebcd3807db |
| SANs: worn.club | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of worn.club. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| club. | present | 679 | 13 | Verified |
| worn.club. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://worn.club/mcp | Verified | 200 | |
| http (plaintext) | http://worn.club/mcp | HTTPS enforced | 308 | https://worn.club/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
fit_watch Fit watches to a wrist ~161
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.
| Name | Type | Req | Description |
|---|---|---|---|
| watches | array | yes | – |
| wrist_mm | number | yes | Wrist circumference in mm, measured where a watch sits (17 cm is 170) |
No output schema declared.
No examples provided.
get_try_on_result Get the measured wrist ~72
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.
| Name | Type | Req | Description |
|---|---|---|---|
| code | string | yes | The code start_try_on returned |
No output schema declared.
No examples provided.
start_try_on Measure the wrist and try watches on ~253
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | The watches to try on |
No output schema declared.
No examples provided.
suggest_sizes Watch sizes for a wrist ~62
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.
| Name | Type | Req | Description |
|---|---|---|---|
| wrist_mm | number | yes | Wrist circumference in mm, measured where a watch sits (17 cm is 170) |
No output schema declared.
No examples provided.
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.
remote · worn.club
claude mcp add --transport http arthexai-worn-fit 'https://worn.club/mcp'
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 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.