DATEV EXTF

Name: DATEV EXTF
Author: seamless-engineering

by seamless-engineeringversion 0.1.0i★ –iRuns on your computer

Registry nameengineering.seamless/datev-extf

Install

Overview

Description from the maker (original English)

Validate and write DATEV-Format (EXTF) files locally, with findings in German and English.

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 on your computer
Transport: stdio
Category: Other

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).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "datev-extf": {
      "command": "npx",
      "args": [
        "-y",
        "@seamless-engineering/datev-extf-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add datev-extf -- npx -y @seamless-engineering/datev-extf-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "datev-extf": {
      "command": "npx",
      "args": [
        "-y",
        "@seamless-engineering/datev-extf-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.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "datev-extf": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@seamless-engineering/datev-extf-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.

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.

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain seamless.engineering (the registry checks domain ownership)
… 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 32455 servers in this category
Published to the registry more recently than 49% of the other 32455 servers in this category
Basic checks equal to or better than 100% of the other 32455 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 DATEV EXTF 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?

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 (0.1.0) reached the registry 41 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, SSTracker free youth training

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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.

datev-extf-mcp

MCP server that validates and writes DATEV-Format (EXTF) files: Buchungsstapel (booking batches) and Debitoren/Kreditoren (customer and supplier master data). Ask your AI assistant why DATEV rejected an import, or have it turn a list of bookings into a file DATEV accepts.

*Deutsch:* MCP-Server, der Dateien im DATEV-Format (EXTF) prüft und schreibt. Fragen Sie Ihren KI-Assistenten, warum DATEV einen Import ablehnt: Er bekommt jeden Fehler mit Zeile, Feld und einer verständlichen Erklärung, etwa Punkt statt Komma im Umsatz, fehlende führende Null im Belegdatum oder BU-Schlüssel auf Automatikkonten.

Local only. The server runs on your machine and reads files from disk. Nothing is uploaded, and there's no account or API key.
Built on @seamless-engineering/datev-extf. Its rules come from DATEV's own material: the Formatbeschreibung on developer.datev.de, the DATEV-Format Prüfprogramm and the #REW import messages.
Every file the writer produces passes the validator.

Prefer a browser? The same checks run in the DATEV EXTF validator (English), also without upload.

Install

Needs Node.js 20 or later.

Claude Code

claude mcp add datev-extf -- npx -y @seamless-engineering/datev-extf-mcp

Claude Desktop (claude_desktop_config.json), Cursor (.cursor/mcp.json) and most other clients:

"mcpServers": { "datev-extf": { "command": "npx", "args": ["-y", "@seamless-engineering/datev-extf-mcp"] } } }

Claude Desktop, one click: download datev-extf-mcp.mcpb from the latest release and open it. Build it yourself with ./scripts/bundle.sh.

Relative file paths resolve against the server's working directory, so absolute paths are the safer choice.

Tools

Tool	What it does
`validate_datev_extf`	Checks a file (`path`) or pasted text (`content`). Returns header data, error and warning counts, and each finding with line, field, value and an explanation in German (`lang: "de"`, default) or English (`"en"`). The encoding is only checked for files.
`explain_datev_finding`	Explains a finding code such as `amount-dot` or `bu-automatic`.
`write_buchungsstapel`	Builds a Buchungsstapel (Formatversion 13) from a header and booking rows (amounts in cents), validates it, and writes it as Windows-1252 to `outputPath` or returns the CSV text.
`list_datev_columns`	Lists the 125 Buchungsstapel or 254 Debitoren/Kreditoren columns by position.

Resources: datev-extf://columns/buchungsstapel, datev-extf://columns/debkred, datev-extf://findings/de and datev-extf://findings/en.

Prompt: fix_datev_import validates a file and proposes fixes for the export that produced it.

Example

Why does DATEV reject ~/Downloads/EXTF_Buchungsstapel.csv?

2 errors, 1 warning in 214 data rows (category buchungsstapel, encoding utf-8).

warning [utf8-without-bom]: The file is UTF-8 without a byte order mark. DATEV then reads it as Windows-1252 and umlauts turn into garbage …
error line 4 [amount-dot]: Amount “49.90” uses a dot as the decimal separator. DATEV expects a comma: 12.50 becomes 12,50.
error line 9 [date-leading-zero]: Document date “506” has only three digits: the leading zero is gone. …

Not tax advice

The server checks format, not bookkeeping. It can't tell whether an account or tax key is right for a transaction, and it doesn't pick them when writing. Agree that with your tax advisor.

DATEV and DATEV-Format are trademarks of DATEV eG. This project is not affiliated with or endorsed by DATEV.

Maintenance

Maintained by seamless.engineering for our own production use: we run managed DATEV integrations for shops, payment providers and ERPs, fully EU-hosted. Issues and PRs welcome, no SLA.

Releasing

Bump version in package.json, both versions in server.json and the one in manifest.json, commit, then tag and push: git tag v0.1.1 && git push origin v0.1.1. The release workflow publishes to npm with provenance via trusted publishing, then to the MCP Registry as engineering.seamless/datev-extf.

MIT licence.

DATEV EXTF

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

SSTracker free youth training

README from the maker

datev-extf-mcp

Install

Tools

Example

Not tax advice

Maintenance

Releasing