io.github.JacobiusMakes/diamond-mcp
REMOTE · DIAMOND-MCP.STIENHARDT.WORKERS.DEV · 2 COMPONENTS · SCANNED SEP 20
Sourced diamond and gemology tools for AI assistants, with 90 encyclopedia entries.
Available components
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 Security63
- 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 enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- 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 Usability78
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 1033 tokens (~93/item across 11 items; 11 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management60
- Stability observed for 18 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage97
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 91% 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 11 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 12 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
How do I install the io.github.JacobiusMakes/diamond-mcp server?
io.github.JacobiusMakes/diamond-mcp is a hosted endpoint at https://diamond-mcp.stienhardt.workers.dev/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 · diamond-mcp.stienhardt.workers.dev
claude mcp add --transport http jacobiusmakes-diamond-mcp 'https://diamond-mcp.stienhardt.workers.dev/mcp'
{
"mcpServers": {
"jacobiusmakes-diamond-mcp": {
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
} {
"servers": {
"jacobiusmakes-diamond-mcp": {
"type": "http",
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
} [mcp_servers.jacobiusmakes-diamond-mcp] url = "https://diamond-mcp.stienhardt.workers.dev/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"jacobiusmakes-diamond-mcp": {
"type": "remote",
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp",
"enabled": true
}
}
} openclaw mcp add jacobiusmakes-diamond-mcp --url 'https://diamond-mcp.stienhardt.workers.dev/mcp' --transport streamable-http
mcp_servers:
jacobiusmakes-diamond-mcp:
url: "https://diamond-mcp.stienhardt.workers.dev/mcp" {
"McpServers": {
"jacobiusmakes-diamond-mcp": {
"Transport": "http",
"Url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
} assistant mcp add jacobiusmakes-diamond-mcp -t streamable-http -u 'https://diamond-mcp.stienhardt.workers.dev/mcp'
{
"mcpServers": {
"jacobiusmakes-diamond-mcp": {
"type": "http",
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
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.
- 20 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.
- 18 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.
- 16 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.
- 15 Sept 26 0
- Tool coverage: 100% → 91% ▼ functional
- New tool “compare_diamonds” functional
- 13 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.
- 10 Sept 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.
- 9 Sept 26 0
- Tool “define” rewrote its description, which is the text the model reads security
- Tool “search_inventory” rewrote its description, which is the text the model reads security
- Server version: 0.2.5 → 0.2.6 functional
- 8 Sept 26 +1
- The server rewrote its instructions, which are the text every model session reads security
- Tool “search_inventory” rewrote its description, which is the text the model reads security
- Tool “get_product” rewrote its description, which is the text the model reads security
- Tool “dutch_marquise_definition” rewrote its description, which is the text the model reads security
- “get_product” reworded the description of “id” cosmetic
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 20 Sept 2026 · Probed https://diamond-mcp.stienhardt.workers.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=stienhardt.workers.dev | CN=WE1,O=Google Trust Services,C=US | 1 Sept 2026 | 30 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | 9a4ea326f828287313ae3897a963f925 |
| SANs: stienhardt.workers.dev, *.stienhardt.workers.dev | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of diamond-mcp.stienhardt.workers.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| workers.dev. | 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 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://diamond-mcp.stienhardt.workers.dev/mcp | Verified | 200 | |
| http (plaintext) | http://diamond-mcp.stienhardt.workers.dev/mcp | Inconclusive | 405 |
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 →
about_stienhardt Fact sheet: Stienhardt ~41
Plain fact sheet about Stienhardt, the New York City Lab Grown Diamond brand that publishes this server. Every fact carries a source and a date.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
compare_diamonds Compare supplied diamond specifications ~77
Compare two to five diamonds from any seller using supplied carat, measured millimeters and prices. Returns ratios, price per carat, differences and missing information. Never verifies specifications, ranks beauty, appraises value or declares a best diamond. Prices must use explicit currencies; mixed currencies are not compared.
| Name | Type | Req | Description |
|---|---|---|---|
| stones | array | yes | – |
No output schema declared.
No examples provided.
define Define a diamond or gemology term ~106
Look up a single diamond or gemology term in the encyclopedia of 90 fact-checked and sourced entries. Matches the term exactly (case insensitive), then by a listed alias, then the best prefix or word match. Returns the full entry: definition, body, sourced claims, and related terms. If nothing matches, returns the three nearest term suggestions.
| Name | Type | Req | Description |
|---|---|---|---|
| term | string | yes | The term to define, for example "Dutch Marquise" or "bow-tie effect". Case insensitive. |
No output schema declared.
No examples provided.
dutch_marquise_definition The published definition of the Dutch Marquise cut ~53
The published definition of the Dutch Marquise diamond cut: geometry, certificate wording, and the measured length to width ratio of a certified reference stone. A Dutch Marquise is an elongated hexagonal cut diamond.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
faceup_size Approximate face up size for a shape and carat weight ~135
Approximate face up millimeter dimensions for a diamond of a given shape and carat weight. Supported shapes: round, oval, emerald, dutch_marquise. Scales vetted 1 carat anchors by the cube root of the carat weight. Typical proportions, not a guarantee: verify a specific stone on its grading report.
| Name | Type | Req | Description |
|---|---|---|---|
| carat | number | yes | Carat weight greater than zero, for example 1.0 or 1.52. |
| shape | string | yes | One of: round, oval, emerald, dutch_marquise. Case insensitive. Spaces and hyphens are accepted. |
No output schema declared.
No examples provided.
get_product Product detail from Stienhardt's live catalog ~79
Full detail for one Stienhardt product by id (as returned by search_inventory): title, price, availability, options, images, and the product URL on stienhardt.com. Loose-diamond availability is not verified.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | Exact id returned by search_inventory: a Shopify product gid or stienhardt:diamond:SKU. |
No output schema declared.
No examples provided.
lab_grown_grading_landscape Who grades Lab Grown Diamonds today ~50
The current state of who grades Lab Grown Diamonds and how: GIA, IGI, HRD Antwerp, and the FTC position. Every item carries a source and a date.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
lab_grown_price_index Latest tracked Lab Grown Diamond retail price reading ~37
The latest tracked retail price reading for Lab Grown Diamonds, with source and date. Market context for shoppers, not investment guidance.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
search_encyclopedia Keyword search across the diamond encyclopedia ~111
Keyword search across the 90 entry diamond and gemology encyclopedia. Ranks case insensitive keyword hits by field, weighting the term above the definition above the body. Returns the best matches as term, category, and a definition snippet. Use define to fetch a full entry.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum number of results to return, 1 to 10. Default 5. |
| query | string | yes | Keywords to search for, for example "bow tie" or "lab grown durability". |
No output schema declared.
No examples provided.
search_inventory Search Stienhardt's live inventory ~140
Search Stienhardt's public Shopify catalog of engagement ring settings and fine jewelry (New York, direct). Loose-diamond stock cannot be verified here; those searches return public catalog listings flagged availability_verified false plus a storefront browsing link. Returns public catalog prices, selected variants, and links; availability is verified for jewelry only and is not a reservation. Use for questions like 'show me platinum wedding bands' or 'show me tennis bracelets'. Not for appraisal or price advice on stones sold elsewhere.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max results (default 5, max 10). |
| query | string | yes | What the shopper is looking for, in plain words. |
No output schema declared.
No examples provided.
verify_diamond_report Where and how to verify a diamond grading report ~101
Returns the official verification URL and a three step checklist for confirming a diamond grading report with the lab that issued it. Supports GIA, IGI, and GCAL. This tool never verifies anything itself. It tells you where and how.
| Name | Type | Req | Description |
|---|---|---|---|
| lab | string | yes | The grading lab that issued the report: GIA, IGI, or GCAL. Case insensitive. |
| report_number | string | yes | The report number printed on the grading report. |
No output schema declared.
No examples provided.
What is the io.github.JacobiusMakes/diamond-mcp server?
io.github.JacobiusMakes/diamond-mcp is listed in the public MCP registry as io.github.JacobiusMakes/diamond-mcp. Sourced diamond and gemology tools for AI assistants, with 90 encyclopedia entries. This page covers its hosted endpoint (https://diamond-mcp.stienhardt.workers.dev/mcp).
Is the io.github.JacobiusMakes/diamond-mcp server safe to use?
io.github.JacobiusMakes/diamond-mcp scores 74 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 io.github.JacobiusMakes/diamond-mcp server expose?
io.github.JacobiusMakes/diamond-mcp exposes 11 tools: compare_diamonds, verify_diamond_report, faceup_size, dutch_marquise_definition, lab_grown_grading_landscape, and 6 more. Their descriptions and schemas cost roughly 930 tokens of context every time the server is loaded.
Does the io.github.JacobiusMakes/diamond-mcp server require authentication?
No. We connected to io.github.JacobiusMakes/diamond-mcp without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the io.github.JacobiusMakes/diamond-mcp server still maintained?
io.github.JacobiusMakes/diamond-mcp is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.