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Kontor MCP server

by DashankaNadeeshanDeSilva·io.github.DashankaNadeeshanDeSilva/kontor-mcp·v1.0.4
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Offline e-invoice tools for AI agents: validate, audit, convert and generate XRechnung/ZUGFeRD.

B78/100grade B
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Safety scan
B78/100

full report

Adoption
Growing

0 stars63 downloads/wk

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Kontor MCP tools (8, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • audit_invoice

    One-call audit for accounts payable: parse + validate (XSD, official EN 16931 / XRechnung rules, Kontor plausibility: totals recomputed, VAT rates, IBAN, Leitweg-ID check digits, dates, duplicates) and return header facts, VAT breakdown, verdict, grouped findings with fix hints and an accept / review / reject recommendation with rationale. Fully offline.

  • check_obligations

    Offline decision tree over the German e-invoicing mandate (§ 14 / § 27 Abs. 38 UStG, UStDV §§ 33/34/34a, E-RechV): what applies to an issuer or receiver (B2B / B2G / B2C), from when, transition rules (2026, 2027 with the €800,000 prior-year turnover threshold, 2028), exemptions (small business, small-amount invoices, exempt supplies, cross-border), accepted formats and whether a Leitweg-ID is need

  • convert_invoice

    Convert an invoice: extract the XML from a ZUGFeRD/Factur-X PDF, convert UBL ↔ CII via the EN 16931 semantic model (post-validated, with an honest loss report of anything that did not survive), or render a self-contained HTML preview to show the invoice to a human. Optional `output_path` writes the artifact (no overwrite unless `overwrite=true`). Fully offline.

  • explain_rule

    Explain an EN 16931 / XRechnung rule id (e.g. BR-DE-15): official text, plain-language explanation (DE/EN), affected business terms, fix hint. Unknown ids get nearest-match suggestions.

  • generate_invoicewrite action

    Create a compliant e-invoice from structured data: XRechnung 3.0 (UBL 2.1, default) or a ZUGFeRD 2.3 / Factur-X PDF/A-3 with embedded factur-x.xml (`target: zugferd-pdf`, profiles EN16931 / BASIC / EXTENDED). Amounts, VAT breakdown and totals are derived decimal-safe; the result is validated internally — for PDFs the XML is read back out of the generated file first (fail-honest: `valid` reports th

  • list_capabilities

    Introspect this server: supported formats and profiles, bundled standard versions (XRechnung, EN 16931, KoSIT configuration, XSDs), rule knowledge-base stats, code lists, legal parameters' last-verified date, tools/resources/prompts and the sovereignty statement (offline, no persistence).

  • parse_invoice

    Detect the format (UBL/CII, EN 16931, XRechnung version, ZUGFeRD/Factur-X profile) of an XML or ZUGFeRD PDF invoice and return its EN 16931 semantic model (BT-annotated). Fully offline.

  • validate_invoice

    Validate an XML or ZUGFeRD PDF invoice against XML Schema and the official EN 16931 / XRechnung Schematron rules (KoSIT-equivalent verdict) plus Kontor plausibility checks, with plain-language explanations and fix hints. Fully offline.

Public scan report

scanner v0.1.10 · 2026-10-31 · same rubric, same numbers if you re-run it

no findings
  • Code scan39 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 65 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 78/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Kontor MCP compares

Against every graded Finance MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
78/100
higher than 62% of 1,759 Finance servers
Tools
8
the typical Finance server has 8
Tools that change things
13%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
63
more than 55% of 422 Finance servers with a package

What its tools let an agent do: 7 read · 1 create

Install Kontor MCP in Claude Code, Cursor or VS Code

Runs npx -y @kontor-mcp/server on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add kontor-mcp -- npx -y @kontor-mcp/server
Add to Cursor

What the publisher says

From the Kontor MCP repository's README, as published. We do not edit it. Read it on GitHub

Kontor MCP

The sovereign e-invoice toolkit for AI agents. Official XRechnung / EN 16931 validation, ZUGFeRD in and out, 100 % offline, zero API keys.

Kontor MCP is a local, offline toolbox that lets AI assistants (Claude Desktop, Claude Code, any MCP client) handle German/EU e-invoices: XRechnung and ZUGFeRD/Factur-X under EN 16931. It can read an invoice (bare XML or XML embedded in a PDF), check it against the official KoSIT / EN 16931 rulebooks, explain cryptic errors in German or English, create valid new invoices (XML or ZUGFeRD PDF/A-3), convert between formats, and tell a business which legal obligations apply. The key promise is sovereignty: no cloud, no API keys, no network calls, no Java at runtime — proven by tests.

Why it matters: since 2025 every German business must be able to receive e-invoices, and from 2027/2028 must issue them. An e-invoice is validated XML, not a PDF, and a failed rule can cost the input-VAT deduction. Invoices carry personal and bank data, so they should be checked where they live — on your machine — with the same rule sets the public-sector receivers use.

Claude Desktop with the kontor server: validate → BR-DE-15 (missing Leitweg-ID) with fix hint · parse a ZUGFeRD PDF · explain BR-DE-18. MP4

v1.0 — 8 tools · 4 resource families · 3 prompts · KoSIT conformance 89/89 enforced as a CI gate · ZUGFeRD PDF/A-3 output verified by veraPDF and Mustang · stdio and Streamable HTTP (bearer auth) · Docker image (amd64/arm64) · kontor-agent reference client · listed in the Official MCP Registry. Install with npx, Docker, or from source.

Why

  • Official rules, not approximations. The KoSIT XRechnung Schematron and the CEN EN 16931 rules run unmodified (compiled to XSLT/SEF, executed with Saxon-JS) with the KoSIT scenario model — the same verdicts the public-sector receivers produce, proven file-by-file against the official validator.
  • Sovereign by construction. Pure TypeScript/WASM, no Java at runtime, no network calls, nothing stored, nothing logged. Runs where the invoices are.
  • Agent-native. Every tool returns structured content and a readable summary; findings carry DE/EN explanations, affected business terms and fix hints; generation is fail-honest (valid is the real verdict, never assumed).
  • ZUGFeRD both ways. Read the embedded XML out of any ZUGFeRD/Factur-X PDF; write PDF/A-3 invoices with factur-x.xml that pass veraPDF and Mustang.

Five-minute quickstart

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Kontor MCP: common questions

Is Kontor MCP server safe?
Mostly: it is graded B (78/100). Read the Kontor MCP safety report
How do I install Kontor MCP?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Kontor MCP need an API key?
Yes. The registry entry asks for KONTOR_AUTH_TOKEN.
Is Kontor MCP maintained?
The last commit was 70 days ago (2026-08-27). The latest release is v1.0.4.
What can I use instead of Kontor MCP?
Servers from other publishers that do the same job: ApexCharts MCP server, three.ws Tutor MCP server and SatGate – Economic Firewall for AI Agents MCP server.
How does Kontor MCP compare with other Finance MCP servers?
safety score 78/100 (higher than 62% of 1,759 Finance servers); tools 8 (the typical Finance server has 8); tools that change things 13% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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