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
InvoiceIn
Overview
Description from the maker (original English)
XRechnung, Factur-X, Peppol, PINT AE, FatturaPA, KSeF → JSON + fix hints. Hosted; MIT=examples only
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: Runs in the cloud
- Transport: Streamable HTTP
- Category: Other
- You need to fill in: X-Api-Key
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.
- You fill in yourself:
X-Api-Key
Values marked secret are keys to your account. Never share them or paste them into a chat.
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 …”.
This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.
Run this in your terminal
claude mcp add --transport http invoicein https://invoicein-api.peculiar.systems/mcp --header 'X-Api-Key: your-value'Fill 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": {
"invoicein": {
"url": "https://invoicein-api.peculiar.systems/mcp",
"headers": {
"X-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": {
"invoicein": {
"type": "http",
"url": "https://invoicein-api.peculiar.systems/mcp",
"headers": {
"X-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 address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
X-Api-Keysecret HTTP headerInvoiceIn API key. Optional: without it the demo quota of 20 invoices a day per IP applies.
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 peculiar-systems, 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 32709 servers in this category
- Published to the registry more recently than 49% of the other 32709 servers in this category
- Basic checks equal to or better than 100% of the other 32709 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 InvoiceIn 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: X-Api-Key
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.1.3) reached the registry 43 days 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, SwarmMemo
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README from the maker
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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.
InvoiceIn — examples
**Any European or UAE (PINT AE) e-invoice a business *receives* → one canonical EN 16931 JSON, a validation report with plain-language fix hints, a PDF, CSV or DATEV export.** One stateless endpoint, nothing stored.
Accepts: XRechnung (UBL and CII), EN 16931 UBL 2.1 Invoice/CreditNote, Peppol BIS Billing 3, CII D16B, ZUGFeRD 1.0 / 2.x and Factur-X hybrid PDFs, Italy's FatturaPA 1.2, Poland's KSeF FA(2)/FA(3), Romania's RO e-Factura (CIUS-RO), the UAE's PINT AE (Billing and Self-Billing).
Validated against: EN 16931 validation artefacts 1.3.17, XRechnung 3.0.2 (KoSIT Schematron 2.6.0), Peppol BIS Billing 3, FNFE CTC-FR 1.4.0.04 (the BR-FR rules; runs when seller and buyer are both established in France), CIUS-RO 1.0.1, OpenPeppol's PINT AE 1.0.4 for the UAE (free check page: https://invoicein.peculiar.systems/uae), the UBL, CII, FatturaPA and KSeF schemas — plus arithmetic cross-checks on every format and market conventions no Schematron reads (German Skonto terms in free text, the Polish KSeF number). The live list with versions is at GET /v1/formats.
- Product page: https://invoicein.peculiar.systems (EN · DE · PL · IT · FR)
- API reference (interactive): https://invoicein-api.peculiar.systems/docs
- OpenAPI: https://invoicein-api.peculiar.systems/openapi.json
- Postman: public collection · published docs — or import
postman/InvoiceIn.postman_collection.json. Every request already carries a real XRechnung in its body, so Send works with no setup - MCP server:
https://invoicein-api.peculiar.systems/mcp(streamable HTTP) — on the official registry asio.github.peculiar-systems/invoiceinand on Smithery
This repository holds runnable examples, sample invoices you can test with, and the MCP registry manifest. The service itself is not open source.
Nothing you send is stored: the document is parsed in memory and the response is built from it. Privacy (full policy) · Terms
The bridge in `bridge/` is a transparent proxy, not a second implementation: it mirrors whatever tools/list returns from the hosted server, so the two can never drift. The five tools and their annotations — all read-only, non-destructive, idempotent, closed-world — are in bridge/tools.json, checked by tests/. A static analyser reading the bridge source alone sees one dispatch callback and no tools; that is the proxy, not the tool surface.
60 seconds
curl -X POST "https://invoicein-api.peculiar.systems/v1/invoice?include=validation&lang=en" \-H "X-Api-Key: $INVOICEIN_KEY" \ -F file=@samples/factur-x-en16931.pdf
No key yet? Leave the header out: 20 invoices a day per IP, same output. A trial key (100 invoices, 30 days, no card) comes from the product page.
The response (full example):
{"ok": true, "source": { "syntax": "UBL", "format": "peppol-bis3", "profile": "Peppol BIS Billing 3.0", "container": "xml" }, "invoice": { // canonical EN 16931, field names carry BT/BG numbers in /v1/schema "document": { "id": "Snippet1", "issue_date": "2017-11-13", "type_code": "380", "currency": "EUR", "due_date": "2017-12-01", ... }, "seller": { "name": "SupplierOfficialName Ltd", "vat_id": "GB1232434", "electronic_address": { "value": "9482348239847239874", "scheme": "0088" }, ... }, "buyer": { ... }, "lines": [ { "id": "1", "quantity": 7, "unit": "DAY", "net_amount": 2800, "tax": { "category": "S", "rate": 25 }, "item": { "name": "item name" } }, ... ], "tax_breakdown": [ { "taxable_amount": 1325, "tax_amount": 331.25, "category": "S", "rate": 25 } ], "totals": { "line_net": 1300, "charges": 25, "net": 1325, "tax": 331.25, "gross": 1656.25, "due": 1656.25 }, "payment": { "means_code": "30", "remittance_info": "Snippet1", "credit_transfers": [ { "iban": "IBAN32423940", "account_name": "AccountName", "bic": "BIC324098" } ] } }, "validation": { "valid": true, "errors": 0, "warnings": 0, "rule_sets": [ { "id": "XSD:ubl-invoice" }, { "id": "EN16931-UBL", "version": "EN 16931 validation artefacts 1.3.17" }, { "id": "Peppol-UBL" } ], "issues": [] }, "timings_ms": { "detect": 0.5, "map": 14.4, "validate": 86.0, "total": 100.8 }, "credits": { "mode": "key", "remaining": 99 } }
When something is wrong, every failed rule carries a hint in the requested language (example, KSeF FA(3) in Polish):
{ "id": "XSD-UNEXPECTED-ELEMENT", "severity": "error", "rule_set": "XSD:fa3","message": "Element '{http://crd.gov.pl/wzor/2025/06/25/13775/}Adnotacje': This element is not expected. Expected is one of ( {http://crd.gov.pl/wzor/2025/06/25/1 …", "hint": "XML zawiera element, którego schemat nie dopuszcza w tym miejscu. Nazwa elementu jest błędna, element należy do innego profilu/wersji (np. UBL 2.0 lub ZUGFeRD EXTENDED), jest zdublowany albo jest własnym rozszerzeniem. Usuń go lub zmień jego nazwę.", "who": "sender", "location": "/*/*[4]/*[8]", "line": 43 }
Endpoints
| Call | Returns | ||||
|---|---|---|---|---|---|
| `POST /v1/invoice?include=validation,html,pdf,csv,datev&lang=en\ | de\ | pl\ | it\ | fr` | everything in one JSON (extras base64/inline) |
POST /v1/parse | canonical JSON only | ||||
POST /v1/validate | validation report only | ||||
POST /v1/render.html · POST /v1/render.pdf | human-readable rendering, labels in the five languages | ||||
| `POST /v1/export.csv?level=lines\ | documents` | flat CSV | |||
| `POST /v1/export.datev?skr=03\ | 04&creditor_account=70000` | DATEV Buchungsstapel (EXTF 700, cp1252) | |||
GET /v1/formats · GET /v1/rules/{id}?lang=de · GET /v1/schema | formats + rule versions · explain a rule id · field guide | ||||
GET /v1/countries | which format each country's mandate asks for, and what we validate it with | ||||
GET /v1/vat/{number} | EU VAT number: format offline, then live VIES, with a dated receipt | ||||
GET /v1/peppol/{id} | is a counterparty published on Peppol, and what can it receive |
Body: multipart field file, or the raw XML/PDF. Send a real User-Agent (Cloudflare rejects the default Python-urllib one with error 1010). Auth: X-Api-Key or Authorization: Bearer. One invoice = one credit whatever outputs you request; a file that carries several invoices (a FatturaPA lot) costs one per invoice. Remaining credits come back in X-Credits-Remaining.
Examples in this repo
examples/curl.sh— every endpoint onceexamples/node.mjs—fetch+FormData, no dependenciesexamples/python.py— standard library onlyexamples/n8n-workflow.json— mailbox attachment → InvoiceIn → JSON, importable into n8nmcp/server.json— manifest for the MCP registry;mcp/clients.md— Claude Desktop / Cursor configbridge/invoicein_mcp_bridge.py— local stdio MCP server that mirrors the hosted server's tools one-to-one and forwards every call (for clients without remote support;Dockerfilebuilds it;bridge/tools.jsonis the offline copy of the tool definitions)
Sample invoices
| File | What it is | Source / licence |
|---|---|---|
samples/xrechnung-3.0-ubl.xml, samples/xrechnung-3.0-cii.xml | the same XRechnung 3.0 invoice in both syntaxes | KoSIT XRechnung testsuite, Apache-2.0 |
samples/peppol-bis3-base-example.xml | Peppol BIS Billing 3 base example | OpenPeppol, Apache-2.0 |
samples/factur-x-en16931.pdf | Factur-X hybrid PDF, EN 16931 profile | ZUGFeRD corpus (FNFE-MPE examples), Apache-2.0 |
samples/ksef-fa3-przyklad-1.xml | KSeF FA(3) official example no. 1 | Polish Ministry of Finance, public |
samples/fatturapa-fpr01.xml | FatturaPA 1.2 official example FPR01 | Agenzia delle Entrate, public |
Both XRechnung files produce the same canonical JSON (only the syntax-specific extensions block differs) — that is the point of the canonical model.
What it does not do
No OCR (a PDF without embedded XML is rejected with pdf-no-xml). Not a Peppol access point, not a French PDP, not a UAE Accredited Service Provider, not a KSeF or SdI client: it reads what you already received and never transmits an invoice anywhere. Factur-X/ZUGFeRD profiles below EN 16931 (MINIMUM, BASIC WL, BASIC) get schema and arithmetic checks only, because the EN 16931 rules would only produce noise there. Validation results are informational, not legal advice.
Licence
The examples in this repository are MIT. Sample invoices keep the licences listed above.