Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer
Nummeropslag
Overview
Description from the maker (original English)
Privacy-first Danish caller ID, CVR company lookup, operator data, and community spam signals.
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
- UsageiVery new↓ 17/wk · ★ –
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: Runs on your computer
- Transport: stdio
- Category: Other
- You need to fill in: NUMMEROPSLAG_API_KEY
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- You fill in yourself:
NUMMEROPSLAG_API_KEY
Values marked secret are keys to your account. Never share them or paste them into a chat.
You need
- PyPIPython’s uv installed (for the uvx command)
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Download 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 nummeropslag --env NUMMEROPSLAG_API_KEY=your-value -- uvx nummeropslag-mcpFill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"nummeropslag": {
"command": "uvx",
"args": [
"nummeropslag-mcp"
],
"env": {
"NUMMEROPSLAG_API_KEY": "your-value"
}
}
}
}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": {
"nummeropslag": {
"type": "stdio",
"command": "uvx",
"args": [
"nummeropslag-mcp"
],
"env": {
"NUMMEROPSLAG_API_KEY": "your-value"
}
}
}
}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.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
- Partner API key from https://nummeropslag.dk/api-noegle
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
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 8, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account andrey-tut, 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 applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Otheri
- More stars than 0% of the other 18594 servers in this category
- Published to the registry more recently than 18% of the other 18594 servers in this category
- Basic checks equal to or better than 100% of the other 18594 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 Nummeropslag 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?
You need to fill in: NUMMEROPSLAG_API_KEY
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.2) reached the registry 3 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need MCPB, Docker, Python (uv) on your computer.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Commonly
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Remote Desktop Commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud✓ desktopcommander.app
Commonly
Read Commonly pods and post as a Commonly agent you create, with a token from your Commonly account.
Runs on your computer
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.
Nummeropslag API
Public Partner API + MCP server for Danish phone-number lookup, caller-ID and spam/trust signals.
Identify who is calling from a Danish number: company from the official CVR register, telecom operator, number type, and a spam/trust verdict based on anonymous user reports. Powered by official open data — not scraping. Use it from any HTTP client, or plug the [MCP server](#mcp-server-ai-agents-) straight into Claude and other AI agents.
🌐 Service: [nummeropslag.dk](https://nummeropslag.dk) · 🔑 Get a key: [/api-noegle](https://nummeropslag.dk/api-noegle) · 📖 API reference: [Redoc](https://andrey-tut.github.io/nummeropslag-api/) · 🧪 Live sandbox: [/api-reference](https://nummeropslag.dk/api-reference) · 🤖 MCP
This repository contains only public API docs, the OpenAPI spec, client examples and the MCP server. The backend source is private.
Authentication
All endpoints require an API key, sent in the X-API-Key header:
X-API-Key: npk_your_key_hereEach key has a plan, a set of scopes (lookup, spam, operator, search) and a request quota. Check your key status any time via GET /api/v1/partner/me.
Base URL: https://nummeropslag.dk/api/v1
Endpoints
| Method | Endpoint | Scope | Description |
|---|---|---|---|
| GET | /partner/lookup/{e164} | lookup | Full lookup — operator, CVR companies, spam/trust signals |
| GET | /partner/spam/{e164} | spam | Compact spam/trust verdict only |
| GET | /partner/operator/{e164} | operator | Telecom operator + number type |
| GET | /partner/search?q= | search | Search companies by name (CVR) |
| GET | /partner/me | — | Your key status: plan, scopes, quota/usage |
{e164} accepts an 8-digit Danish number or full E.164 — e.g. 33633363 or +4533633363.
Full machine-readable contract: openapi/openapi.yaml · openapi/openapi.json.
Quick start
export NUMMEROPSLAG_API_KEY=npk_your_key_herecurl -H "X-API-Key: $NUMMEROPSLAG_API_KEY" \ https://nummeropslag.dk/api/v1/partner/spam/33633363
Client examples
Ready-to-run, dependency-free clients in examples/:
| Language | File | Run |
|---|---|---|
| Bash / curl | examples/curl.sh | ./curl.sh 33633363 |
| Python (stdlib) | examples/python_client.py | python3 python_client.py 33633363 |
| Node.js 18+ | examples/node_client.js | node node_client.js 33633363 |
| PHP | examples/php_client.php | php php_client.php 33633363 |
All read the key from the NUMMEROPSLAG_API_KEY environment variable.
Workflow integrations
Use Nummeropslag as native nodes and tools in popular automation and AI workflow builders:
| Platform | Integration | Location |
|---|---|---|
| n8n | Community node with five operations and AI Tool support | integrations/n8n |
| Dify | Installable tool plugin for Workflows, Chatflows and Agents | integrations/dify |
| Langflow | Custom component with Tool Mode support | integrations/langflow |
| Flowise | Ready-to-paste Custom Tool functions and schemas | integrations/flowise |
The integrations store the API key in each platform's credential/secret system and send queries only to https://nummeropslag.dk.
MCP server (AI agents) 🤖
Give your AI agent (Claude Desktop, Claude Code, or any Model Context Protocol client) direct access to Danish phone-number data. The server in mcp/ wraps the Partner API as MCP tools — same official data, same privacy rules (no names of private individuals).
One-click desktop installation
Download the latest nummeropslag-mcp-*.mcpb bundle from GitHub Releases, open it with a compatible desktop client, and enter your Nummeropslag API key when prompted. The bundle uses the managed uv runtime, so users do not need to install Python dependencies manually.
The canonical registry identifier is io.github.andrey-tut/nummeropslag.
Docker
The same stdio server is published as a public OCI image:
docker run --rm -i \-e NUMMEROPSLAG_API_KEY=npk_your_key_here \ ghcr.io/andrey-tut/nummeropslag-mcp:latest
MCP calls are metered against a separate MCP quota (not your REST quota); the server sends X-Client: mcp automatically.
Tools
| Tool | Description |
|---|---|
lookup_number(number) | Full record: company (CVR), operator, spam/trust, comments |
check_spam(number) | Compact spam/scam verdict (caller-ID style) |
get_operator(number) | Operator + number type only (cheapest) |
search_businesses(query, limit) | Find Danish companies by name (CVR) |
api_status() | Your key's scopes + quota usage |
Setup — via PyPI (recommended)
pip install nummeropslag-mcp # or: uvx nummeropslag-mcpexport NUMMEROPSLAG_API_KEY=npk_your_key_here # https://nummeropslag.dk/api-noegle nummeropslag-mcp # stdio transport
Add to Claude Desktop (claude_desktop_config.json) or Claude Code (.mcp.json):
{"mcpServers": { "nummeropslag": { "command": "nummeropslag-mcp", "env": { "NUMMEROPSLAG_API_KEY": "npk_your_key_here" } } } }
Run from source instead (no PyPI)
pip install "mcp[cli]" httpxpython mcp/server.py
…and use "command": "python", "args": ["/absolute/path/to/nummeropslag-api/mcp/server.py"] in the config above.
Restart your client, then ask e.g. *"Is +45 70 10 20 30 spam?"* or *"Who owns 33 63 33 63?"*.
Errors
Errors use a consistent envelope:
{ "error": { "code": "forbidden", "message": "…", "details": {} } }Common codes: unauthorized (missing/invalid key), forbidden (scope not allowed), rate_limited (quota exceeded), not_found.
Data & privacy
- Core data: official CVR (companies + production units) and the Danish number plan (SDFI, CC0).
- Spam verdicts use k-anonymity — a public "spam" label requires several independent reports.
- Names of private individuals are never exposed. Contacts are never uploaded (GDPR-compliant).
Privacy Policy
The MCP server sends only the phone number or business query requested by the user to the first-party Nummeropslag API. It does not read conversations, files, contacts, or call logs. See the full Nummeropslag privacy policy for data collection, use, retention, sharing, and contact information.
License
The client examples and OpenAPI spec in this repository are released under the MIT License (see LICENSE) — copy and adapt them freely. The Nummeropslag API service itself and its data are proprietary; use is governed by the terms at nummeropslag.dk.