Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
Diamond MCP
Overview
Description from the maker (original English)
Sourced diamond and gemology tools for AI assistants, with 90 encyclopedia entries.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Computer or cloud
- Transport: stdio, Streamable HTTP
- Category: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://diamond-mcp.stienhardt.workers.dev/mcpDownload the maker’s .mcpb file
The link goes to the maker’s own file; we do not host or repackage it. Open the file and Claude Desktop installs it.
Run this in your terminal
claude mcp add --transport http diamond https://diamond-mcp.stienhardt.workers.dev/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"diamond": {
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"diamond": {
"type": "http",
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://diamond-mcp.stienhardt.workers.dev/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account JacobiusMakes, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Otheri
- More stars than 0% of the other 32696 servers in this category
- Published to the registry more recently than 39% of the other 32696 servers in this category
- Basic checks equal to or better than 100% of the other 32696 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Diamond MCP safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
Either way works: install it on your computer or connect to the cloud version.
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.2.9) reached the registry 2 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, LexPact UK Contracts
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
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by desktop-commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud★ 211Updated 2 days ago
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LexPact UK Contracts
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Generate UK-law contracts: NDA, service, freelance, recruiter terms of business, IR35.
Runs on your computerUpdated today
Install
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
diamond-mcp
Hosted comparison update (September 14, 2026): see worker/COMPARISON.md for an executable example and availability. Catalog search and measurement: see worker/MEASUREMENT.md for budget filtering, optional measured links, validation and attribution limits.
Diamond education tools for AI assistants, served over the Model Context Protocol (MCP).
The hosted endpoint now has 11 tools: eight education tools, a seller-independent specification comparison, and two read-only inventory tools. The Node source includes comparison; published 0.2.6 packages and the Python server still have the original eight tools. Education tools use a sourced, dated facts file and a 90 entry gemology encyclopedia. The local Python build uses only the standard library and makes no network calls. All education data ships in this repo as facts.json and encyclopedia.json.
Maintained by Stienhardt, a New York City Lab Grown Diamond jeweler.
One-click desktop bundle
Download diamond-mcp-0.2.6.mcpb for a self-contained local bundle. Apps that support MCP Bundles can install it without an account, API key, Python environment, or package-manager command. The bundle runs locally with Node.js and makes no network calls.
For a managed gateway with the hosted tools, connect through Smithery. The Smithery release exposes the same sourced education tools plus live inventory search.
Why a jeweler published an MCP server
People ask AI assistants their diamond questions now. We'd rather those assistants answer with sourced facts than with guesses. So we published the facts in a form an assistant can call: where to verify a grading report, how big a 1.5 carat oval actually looks, what a Dutch Marquise is, who grades Lab Grown Diamonds today, and what the market did last month. Every factual claim in facts.json carries a source and a date.
Honest scope
- Education, not appraisal. Nothing here values, grades, or verifies a stone.
- Always verify a real stone on the grading lab's own site.
verify_diamond_reportreturns the right place and a checklist. It never claims to verify anything itself. - The price index is market context for shoppers, not investment guidance. A diamond is a love piece, not an investment.
- The local server makes no network calls. It reads
facts.jsonandencyclopedia.jsonfrom disk and answers. The hosted endpoint is the one exception: its two inventory tools read the public Shopify catalog, and its/golink counter is described under Hosted endpoint.
Measurable commerce paths
High-intent answers from faceup_size, dutch_marquise_definition, lab_grown_price_index, and about_stienhardt include an optional Stienhardt link. Each link carries diamond_mcp source tags plus the originating tool. Shape and carat are included for faceup_size. Preserve the query string if you surface one of these links to a user. These tags support downstream attribution if the storefront preserves them. The optional redirect counter measures requests, not unique shoppers, purchases, or revenue.
The tools
| Tool | Arguments | What it returns |
|---|---|---|
compare_diamonds | stones (2 to 5 labeled specifications) | Supplied dimensions, length-to-width ratio, price per carat, differences from the first stone, and missing information. Explicit currencies required for prices. Hosted endpoint and Node source only. No appraisal or winner. |
verify_diamond_report | lab, report_number | The official verification URL for GIA, IGI, or GCAL, plus a three step checklist. Where and how to verify, never a verification itself. |
faceup_size | shape, carat | Approximate face up millimeter dimensions, scaled from vetted 1 carat anchors by the cube root of the carat weight. Shapes: round, oval, emerald, dutch_marquise. |
dutch_marquise_definition | none | The published definition: geometry, certificate wording, and the measured length to width ratio of a certified reference stone. |
lab_grown_grading_landscape | none | Who grades Lab Grown Diamonds today (GIA, IGI, HRD Antwerp) and the FTC position, each with source and date. |
lab_grown_price_index | none | The latest tracked retail price reading, with source and date; check as_of for freshness. |
about_stienhardt | none | A plain fact sheet about the publisher. |
define | term | The full encyclopedia entry for a term: definition, body, sourced claims, related terms. Exact match first, then a listed alias, then the best prefix or word match. Returns three nearest suggestions when nothing matches. |
search_encyclopedia | query, limit | Keyword search across all 90 encyclopedia entries, ranked term over definition over body. Returns term, category, and a definition snippet. |
The hosted endpoint also exposes two live, read-only commerce tools:
| Tool | Arguments | What it returns |
|---|---|---|
search_inventory | query, limit | Public Shopify engagement ring settings and fine jewelry with prices and attributed product links. Loose-diamond queries return public catalog listings flagged availability_verified: false plus a storefront browsing link. |
get_product | id | Current product detail, availability, options, images, and an attributed product link. |
Example
Calling faceup_size with {"shape": "dutch_marquise", "carat": 1.5} returns, among other fields:
{"shape": "dutch_marquise", "carat": 1.5, "approx_face_up_mm": { "length": 10.8, "width": 5.8 }, "display": "10.8 x 5.8 mm", "anchor_1ct_mm": "9.4 x 5.1 mm", "method": "Scale a vetted 1 carat anchor by the cube root of the carat weight.", "note": "Approximate figures based on typical proportions. Cut proportions vary from stone to stone, so verify a specific stone's measurements on its grading report." }
Calling dutch_marquise_definition returns, among other fields:
{"definition": "A Dutch Marquise is an elongated hexagonal cut diamond.", "geometry": "Pointed ends and straight, angular sides. The outline is an elongated hexagon, not a navette, and the points are not softened.", "status": "Dutch Marquise is a trade name, not a standardized grading term.", "on_an_igi_report": "On the IGI grading report for Stienhardt's certified Dutch Marquise reference stone, the shape reads Hexagonal Modified Brilliant." }
The encyclopedia
The server also ships a diamond and gemology encyclopedia: 90 fact-checked and sourced entries across 9 domains (cuts and shapes, the 4Cs and grading, diamond anatomy, light and optics, materials and simulants, Lab Grown Diamonds, settings and metals, care and buying, and history and myths). Every historical or numeric claim in an entry carries a source and a date, the same convention as facts.json.
- Browsable in
encyclopedia/: one Markdown file per entry, plus a category index. - Machine-readable in
encyclopedia.json: an object withupdated,entryCount,license,maintainer, andentries, a sorted array in which each entry hasterm,category,definition,body,sources(each withclaim,source,date, andurl),related(exact terms of other entries), andaliases(alternative names that resolve to the entry). - Queryable from an assistant through two tools:
definetakes atermand returns the full entry, matching exactly first, then a listed alias, then the best prefix or word match, and offering the three nearest terms when nothing matches.search_encyclopediatakes aqueryand returns ranked matches (term, category, and a definition snippet), weighting hits in the term above the definition above the body.
Calling define with {"term": "Dutch Marquise"} returns, among other fields:
{"found": true, "match": "exact", "term": "Dutch Marquise", "category": "Cuts and shapes", "definition": "A Dutch Marquise is an elongated hexagonal cut diamond. ...", "related": ["hexagon cut", "marquise cut", "navette", "length-to-width ratio", "IGI report"] }
Hosted endpoint
Connect any Streamable HTTP MCP client to:
https://diamond-mcp.stienhardt.workers.dev/mcpThe endpoint requires no account or API key. It exposes all 11 tools, including the live inventory search. Cloudflare's edge in front of workers.dev rejects requests that carry Python's default urllib user agent (error 1010); every other common client, including requests, httpx, Node, and curl, is served. If you script against the endpoint with urllib, set a User-Agent header.
Loose-diamond stock is not verified by this tool. Loose-diamond searches return the matching public catalog listings with availability_verified: false, an availability note, and a first-party browse_url, without calling a stock service. Legacy stienhardt:diamond:SKU lookups return isError: true plus the same kind of browse link. Shopify carrier availability does not verify the underlying stone, so no loose-diamond result claims to be in stock.
Jewelry results use the public Shopify UCP catalog, select an available variant matching the requested metal, and preserve that variant in the product URL. Ring size still needs selection and confirmation on the product page. Availability is a current check, not a reservation.
For Worker maintainers: no private stock credentials or endpoints belong in this integration. Do not reuse credentials found in storefront code. Before deployment run node --experimental-strip-types worker/test/inventory.mjs, build a dry-run bundle with wrangler deploy --dry-run --outdir , then run node worker/test/containment.mjs /index.js (scans the bundle for private endpoints and credentials) and node worker/test/handler.mjs /index.js (exercises the request handler offline). After deployment verify that a loose-diamond search returns listings flagged availability_verified: false and that a jewelry search returns an available variant.
The hosted Worker also provides a measured /go redirect for external buying tools. It accepts only HTTPS destinations on stienhardt.com, preserves the destination's UTM parameters, and records a 90-day click event containing campaign labels and destination path. It does not store an IP address, cookie, identity, or free-form search phrase in the click dataset. This supplies an outbound-click denominator even when storefront analytics are blocked.
Business discovery endpoint
Stienhardt also publishes a separate PUBLICMCP-compatible business profile. It gives AI assistants canonical business identity, services, New York location, and live product discovery through five read-only tools. PUBLICMCP and A2A Registry calls have separate attributed paths, so visits and sales can be measured by discovery source.
The business endpoint is separate from the 10-tool Diamond MCP server. Its source is in publicmcp-worker/.
Two local flavors: Python and Node
diamond-mcp has Python and Node builds sharing the eight education tools and data. Current Node source adds compare_diamonds; the published 0.2.6 packages retain eight tools:
- Python (this directory): run straight from a clone with
python server.py(PyPI publication pending). Pure standard library
Only the beginning is shown; read the rest in the repo