What is beliq-validate-einvoice?

A validation tool for European electronic invoices, including XRechnung, ZUGFeRD, Factur-X, Peppol BIS, UBL, and CII documents. It checks invoices against the official rules for their format and profile.

Use it to validate an invoice file, identify its format and checked ruleset, and understand every reported failure.

It identifies whether an electronic invoice is compliant and explains the specific rules it breaks, instead of requiring manual inspection of complex invoice files.

beliq-validate-einvoice — Skill for Claude Code and Codex by beliq-eu

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add beliq-eu/beliq-mcp --skill skill

Clone the repo

git clone --depth 1 https://github.com/beliq-eu/beliq-mcp

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/beliq-eu/beliq-mcp/skill/github.svg)](https://agentmods.dev/skills/beliq-eu/beliq-mcp/skill)

Your own site

<a href="https://agentmods.dev/skills/beliq-eu/beliq-mcp/skill"><img src="https://agentmods.dev/badge/skills/beliq-eu/beliq-mcp/skill/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/beliq-eu/beliq-mcp/skill"><img src="https://agentmods.dev/badge/skills/beliq-eu/beliq-mcp/skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,206 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.01206
Opus 5	$0.00000	$0.00603
Sonnet 5	$0.00000	$0.00241
Haiku 4.5	$0.00000	$0.00121

Measured 9d ago against content hash 66cee6518fe6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

beliq-validate-einvoice scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skill/SKILL.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

beliq: validate EU e-invoices

Use the beliq MCP server to validate an EU electronic invoice and explain the result. beliq checks a document against authority-pinned, drift-checked rule sets (the official Schematron and XSD bundles for each format) and returns a precise verdict: whether it is valid, the format and profile it detected, the ruleset version it was checked against, and every rule that failed.

When this applies

The user has an e-invoice (or a path to one) and wants to know if it is compliant, or wants the failures explained. The document can be:

UBL or CII XML (XRechnung, Peppol BIS, and other EN 16931 syntaxes).
A Factur-X / ZUGFeRD PDF (a PDF with embedded invoice XML); pass it by file path.

This skill focuses on validation. To parse a document into a structured invoice, generate a compliant one, or convert between formats, the same beliq MCP server exposes beliq_parse_einvoice, beliq_generate_einvoice, and beliq_convert_einvoice.

Prerequisite: the MCP server

The tools come from the beliq-mcp server. If it is not already configured, install it once:

claude mcp add beliq -e BELIQ_API_KEY=blq_your_key -- npx -y beliq-mcp

Create the API key in the beliq dashboard under API Keys. To send the key as a bearer token instead of X-API-Key, add -e BELIQ_AUTH=bearer.

Tools

beliq_validate_einvoice - the primary tool. Inputs:
- document - the invoice as XML text, OR
- documentPath - a path to an XML or Factur-X/ZUGFeRD PDF file on disk (provide exactly one of these two).
- format (optional) - auto (default, detects CII vs UBL), cii, or ubl.
- franceCtc (optional) - set true to apply the French CTC (Factur-X / Chorus Pro) rule overlay.
beliq_check_account - verifies the configured key and reports the plan and remaining quota. It draws no quota. Run it first if a call fails with an auth error, to confirm the key is accepted.

How to validate

If the user pasted XML, pass it as document. If they pointed at a file (especially a PDF), pass documentPath - do not try to read a binary PDF into document.
Leave format as auto unless the user is explicit about the syntax.
Set franceCtc: true only when the invoice targets the French CTC flow.

Read the full file on GitHub · 71 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 71 lines · 0 tokens per session scan A 66cee6518fe6

Subscribe to this mod's changes

beliq-validate-einvoice is a skill published in the GitHub repository beliq-eu/beliq-mcp (0 stars, last pushed today), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,206 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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