Kontor MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 39 installs a week from npm. Last commit 27 Aug 2026.
Offline e-invoice tools for AI agents: validate, audit, convert and generate XRechnung/ZUGFeRD.
We read the source, 2 d ago · rules ccca72095570
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
execFileSync(
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add kontor-mcp -- npx -y @kontor-mcp/server
{
"mcpServers": {
"kontor-mcp": {
"args": [
"-y",
"@kontor-mcp/server"
],
"command": "npx"
}
}
}
[mcp_servers.kontor-mcp]
command = "npx"
args = ["-y", "@kontor-mcp/server"]
{
"mcpServers": {
"kontor-mcp": {
"args": [
"-y",
"@kontor-mcp/server"
],
"command": "npx"
}
}
}
{
"mcpServers": {
"kontor-mcp": {
"args": [
"-y",
"@kontor-mcp/server"
],
"command": "npx"
}
}
}
This one needs environment variables set before it will start:
KONTOR_MAX_FILE_MB (Maximum input file size in MB (default 20)), KONTOR_LANG_DEFAULT (Default language for explanations: de or en).
The author declared them in the registry entry; get the values from the project itself.
Validate and parse German e-invoices (XRechnung, ZUGFeRD, Factur-X) offline. No API key.
Validate and generate German e-invoices (XRechnung, ZUGFeRD) against the official KoSIT rules.
XRechnung & ZUGFeRD: create, validate, and convert German e-invoices. EN 16931 compliant.
KoSIT-verified German e-invoices: generate & validate ZUGFeRD, Factur-X, XRechnung, EN 16931.
Extract, create, convert & validate invoices (UBL, CII, XRechnung, ZUGFeRD, PDF, Excel)
Validate, generate & convert EU e-invoices (UBL, CII, XRechnung, Factur-X) — EN 16931 pre-validated.
Create, validate, convert & extract compliant e-invoices (UBL, Factur-X, ZUGFeRD, XRechnung)
Read, validate and write e-invoices on your own machine. XRechnung, ZUGFeRD, Factur-X, UBL, CII.
Answers built from our own checks of this server.