# EU EN-16931 & XRechnung Deterministic Validator (remote · agent-gateway-i3gust564q-ey.a.run.app)

Official KoSIT EN 16931 & XRechnung XML validator issuing signed Ed25519 VCs. Zero retention.

- Trust score: 60/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `agent-gateway-i3gust564q-ey.a.run.app`: 60/100 (this document), [markdown](https://verifymcp.io/servers/eu-iotpay-en16931-validator/agent-gateway-i3gust564q-ey.md), [page](https://verifymcp.io/servers/eu-iotpay-en16931-validator/agent-gateway-i3gust564q-ey)

## Channel facts

- Endpoint: `https://agent-gateway-i3gust564q-ey.a.run.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.9.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 54/100
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 293 tokens (~97/item across 3 items; 3 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 82/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 45% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the EU EN-16931 & XRechnung Deterministic Validator MCP server?

EU EN-16931 & XRechnung Deterministic Validator is a hosted endpoint at https://agent-gateway-i3gust564q-ey.a.run.app/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http eu-iotpay-en16931-validator 'https://agent-gateway-i3gust564q-ey.a.run.app/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "eu-iotpay-en16931-validator": {
      "url": "https://agent-gateway-i3gust564q-ey.a.run.app/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "eu-iotpay-en16931-validator": {
      "type": "http",
      "url": "https://agent-gateway-i3gust564q-ey.a.run.app/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.eu-iotpay-en16931-validator]
url = "https://agent-gateway-i3gust564q-ey.a.run.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "eu-iotpay-en16931-validator": {
      "type": "remote",
      "url": "https://agent-gateway-i3gust564q-ey.a.run.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add eu-iotpay-en16931-validator --url 'https://agent-gateway-i3gust564q-ey.a.run.app/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  eu-iotpay-en16931-validator:
    url: "https://agent-gateway-i3gust564q-ey.a.run.app/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "eu-iotpay-en16931-validator": {
      "Transport": "http",
      "Url": "https://agent-gateway-i3gust564q-ey.a.run.app/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add eu-iotpay-en16931-validator -t streamable-http -u 'https://agent-gateway-i3gust564q-ey.a.run.app/mcp'
```

### Other

```json
{
  "mcpServers": {
    "eu-iotpay-en16931-validator": {
      "type": "http",
      "url": "https://agent-gateway-i3gust564q-ey.a.run.app/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 60, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-11-03 (score 59, +36)

- [security improvement] Injection markers: unverified → pass
- [security improvement] Transport: fail → pass
- [security] First check of Judged manipulation: pass
- [security] Authorization: Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] MCP protocol: unverified → pass
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: fair
- [functional] First check of Destructive annotations: pass
- [functional] First check of Tool coverage: 45
- [functional] First check of Schema quality: pass

### 2026-11-01 (score 23)

First indexed and scored.

## MCP tools (3)

### `validate_en16931_e_invoice` (~88 tokens)

Official KoSIT EN 16931 & XRechnung XML validator issuing signed Ed25519 VCs. Zero retention.

Input parameters:

- `ap2_intent_mandate_id` (string)
- `max_accepted_fee_eur` (number)
- `xml_content` (string, required): Raw EN 16931 / XRechnung / UBL / CII XML string.

### `screen_sanctions_and_kyb` (~119 tokens)

Deterministic EU FSF, UN & OpenSanctions KYB screening issuing signed Ed25519 Non-Hit VCs.

Input parameters:

- `ap2_intent_mandate_id` (string)
- `country_code` (string): ISO-3166-1 alpha-2 country code.
- `entity_name` (string, required): Legal company or beneficiary name to screen.
- `max_accepted_fee_eur` (number)
- `vat_or_lei_id` (string): Optional EU VAT ID or LEI identifier.

### `redact_gdpr_pii_text` (~86 tokens)

Zero-retention GDPR PII redaction gate (IBAN, Tax-ID, HRB, Names) with signed Ed25519 VC.

Input parameters:

- `ap2_intent_mandate_id` (string)
- `max_accepted_fee_eur` (number)
- `raw_text` (string, required): Unstructured text containing potential DACH/EU PII.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/eu-iotpay-en16931-validator/agent-gateway-i3gust564q-ey#diagnostics

## Score history

- 2026-11-05: 60
- 2026-11-04: 60
- 2026-11-03: 59
- 2026-11-02: 23
- 2026-11-01: 23

## Common questions

### What is the EU EN-16931 & XRechnung Deterministic Validator MCP server?

EU EN-16931 & XRechnung Deterministic Validator is an MCP server listed in the public MCP registry as eu.iotpay/en16931-validator. Official KoSIT EN 16931 & XRechnung XML validator issuing signed Ed25519 VCs. Zero retention. This page covers its hosted endpoint (https://agent-gateway-i3gust564q-ey.a.run.app/mcp).

### Is the EU EN-16931 & XRechnung Deterministic Validator MCP server safe to use?

EU EN-16931 & XRechnung Deterministic Validator scores 60 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the EU EN-16931 & XRechnung Deterministic Validator MCP server expose?

EU EN-16931 & XRechnung Deterministic Validator exposes 3 tools: validate_en16931_e_invoice, screen_sanctions_and_kyb, redact_gdpr_pii_text. Their descriptions and schemas cost roughly 293 tokens of context every time the server is loaded.

### Does the EU EN-16931 & XRechnung Deterministic Validator MCP server require authentication?

No. We connected to EU EN-16931 & XRechnung Deterministic Validator without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the EU EN-16931 & XRechnung Deterministic Validator MCP server still maintained?

EU EN-16931 & XRechnung Deterministic Validator is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://agent-gateway-i3gust564q-ey.a.run.app/mcp
- Website: https://iotpay.eu/
- Changelog RSS feed: https://verifymcp.io/servers/eu-iotpay-en16931-validator/agent-gateway-i3gust564q-ey.xml
- Changelog JSON feed: https://verifymcp.io/servers/eu-iotpay-en16931-validator/agent-gateway-i3gust564q-ey.json
- HTML version of this page: https://verifymcp.io/servers/eu-iotpay-en16931-validator/agent-gateway-i3gust564q-ey