# GCC e-Invoice Preflight Oracle (remote · einvoice.noahsarch.tech)

Validate UAE PINT AE and Saudi ZATCA e-invoices: UBL, official Schematron, QR, fix hints.

- Trust score: 68/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `einvoice.noahsarch.tech`: 68/100 (this document), [markdown](https://verifymcp.io/servers/tech-noahsarch-einvoice-preflight/einvoice.md), [page](https://verifymcp.io/servers/tech-noahsarch-einvoice-preflight/einvoice)

## Channel facts

- Endpoint: `https://einvoice.noahsarch.tech/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.1`

## 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**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 406, which proves neither a plaintext path nor enforcement.
  - 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**: 74/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1759 tokens (~195/item across 9 items; 7 tools + 2 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 17/100
  - Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 93/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 74% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the GCC e-Invoice Preflight Oracle MCP server?

GCC e-Invoice Preflight Oracle is a hosted endpoint at https://einvoice.noahsarch.tech/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 tech-noahsarch-einvoice-preflight 'https://einvoice.noahsarch.tech/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "tech-noahsarch-einvoice-preflight": {
      "url": "https://einvoice.noahsarch.tech/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "tech-noahsarch-einvoice-preflight": {
      "type": "http",
      "url": "https://einvoice.noahsarch.tech/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.tech-noahsarch-einvoice-preflight]
url = "https://einvoice.noahsarch.tech/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tech-noahsarch-einvoice-preflight": {
      "type": "remote",
      "url": "https://einvoice.noahsarch.tech/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add tech-noahsarch-einvoice-preflight --url 'https://einvoice.noahsarch.tech/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  tech-noahsarch-einvoice-preflight:
    url: "https://einvoice.noahsarch.tech/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "tech-noahsarch-einvoice-preflight": {
      "Transport": "http",
      "Url": "https://einvoice.noahsarch.tech/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add tech-noahsarch-einvoice-preflight -t streamable-http -u 'https://einvoice.noahsarch.tech/mcp'
```

### Other

```json
{
  "mcpServers": {
    "tech-noahsarch-einvoice-preflight": {
      "type": "http",
      "url": "https://einvoice.noahsarch.tech/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 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 66, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-31 (score 66)

First indexed and scored.

## MCP tools (7)

### `validate_invoice` (~317 tokens)

Validate one e-invoice (UAE PINT AE / KSA ZATCA)

Full preflight of one UBL Invoice or CreditNote: XML well-formedness, UBL 2.1 XSD, the official PINT AE Schematron (≈300 rules incl. the UAE jurisdiction overlay) or the ZATCA pre-check, plus advisory cross-checks. Returns a verdict and every finding with rule id, severity, fields, location and fix hint. Example: xml '<Invoice …>', jurisdiction 'auto'. Response: result with verdict (ACCEPTED | ACCEPTED_WITH_WARNINGS | REJECTED), findings[] (id, severity, message, fields, location, fix_hint, source = xsd | schematron | preflight), counts, ruleset version and timings, plus data_confidence, estimated_items[], sources[], data_version, warnings[] and a disclaimer. Documents are validated in memory and never stored or logged.

Input parameters:

- `include_info` (boolean): Include info-level notes (e.g. test-data TRNs).
- `jurisdiction` (string): 'ae' PINT AE Billing, 'ae-sb' PINT AE Self-Billing, 'sa' ZATCA (KSA), or 'auto' (from CustomizationID / ProfileID).
- `preflight` (boolean): Also run the advisory Noah's Arch checks (nae-*/nksa-*: TRN/TIN consistency, emirate codes, VAT rates, totals cross-check, dates).
- `xml` (string, required): The UBL 2.1 Invoice or CreditNote XML as a string.

### `readiness_report` (~180 tokens)

Validate up to 100 e-invoices and summarise readiness

Batch preflight for a go-live check or an ERP regression suite: per-document verdicts, readiness percentage, the most frequent rejection rules across the batch, optional printable HTML. Charged per document. Response: result with verdict (ACCEPTED | ACCEPTED_WITH_WARNINGS | REJECTED), findings[] (id, severity, message, fields, location, fix_hint, source = xsd | schematron | preflight), counts, ruleset version and timings, plus data_confidence, estimated_items[], sources[], data_version, warnings[] and a disclaimer. Documents are validated in memory and never stored or logged.

Input parameters:

- `documents` (array, required): Up to 100 documents.
- `format` (string): 'html' adds a self-contained printable report in result.html.
- `jurisdiction` (string)
- `preflight` (boolean)

### `extract_summary` (~145 tokens)

Read the key fields of a UBL invoice

Seller/buyer (names, TRN, endpoint, legal registration, emirate), dates, currency, totals, VAT breakdown, line count, payment means, attachments and the detected rule set — without validating. Free. Response: result with verdict (ACCEPTED | ACCEPTED_WITH_WARNINGS | REJECTED), findings[] (id, severity, message, fields, location, fix_hint, source = xsd | schematron | preflight), counts, ruleset version and timings, plus data_confidence, estimated_items[], sources[], data_version, warnings[] and a disclaimer. Documents are validated in memory and never stored or logged.

Input parameters:

- `xml` (string, required)

### `list_rules` (~186 tokens)

List the official PINT AE rules

Rule ids, severities and texts from the installed PINT AE Schematron (shared PINT rules and the -ae jurisdiction rules), filterable by severity or text, with fix hints where we have them. Free. Example: contains 'TaxPointDate'. Response: result with verdict (ACCEPTED | ACCEPTED_WITH_WARNINGS | REJECTED), findings[] (id, severity, message, fields, location, fix_hint, source = xsd | schematron | preflight), counts, ruleset version and timings, plus data_confidence, estimated_items[], sources[], data_version, warnings[] and a disclaimer. Documents are validated in memory and never stored or logged.

Input parameters:

- `contains`: Filter by text, e.g. 'TaxPointDate', 'ibr-co', 'BTAE-16'.
- `jurisdiction` (string)
- `severity`

### `check_trn` (~168 tokens)

Check a UAE TRN and derive the Peppol endpoint

Format check of a UAE Tax Registration Number (15 digits) and derivation of the TIN / Peppol participant identifier (scheme 0235 = first 10 digits). Free. Example: trn '100 1234 5670 0003'. Response: result with verdict (ACCEPTED | ACCEPTED_WITH_WARNINGS | REJECTED), findings[] (id, severity, message, fields, location, fix_hint, source = xsd | schematron | preflight), counts, ruleset version and timings, plus data_confidence, estimated_items[], sources[], data_version, warnings[] and a disclaimer. Documents are validated in memory and never stored or logged.

Input parameters:

- `trn` (string, required): UAE Tax Registration Number as printed (spaces/dashes allowed).

### `zatca_qr_decode` (~156 tokens)

Decode a ZATCA QR (TLV)

Decode the base64 TLV of a Saudi e-invoice QR into seller name, VAT number, timestamp, totals, hash, signature and key tags, with phase detection and format issues. Free. Response: result with verdict (ACCEPTED | ACCEPTED_WITH_WARNINGS | REJECTED), findings[] (id, severity, message, fields, location, fix_hint, source = xsd | schematron | preflight), counts, ruleset version and timings, plus data_confidence, estimated_items[], sources[], data_version, warnings[] and a disclaimer. Documents are validated in memory and never stored or logged.

Input parameters:

- `qr` (string, required): Base64 TLV content of a ZATCA QR code.

### `zatca_qr_encode` (~290 tokens)

Build a ZATCA QR (TLV) payload

Encode the five phase-1 fields (plus optional phase-2 hash/signature/key tags) into the base64 TLV string that goes into the QR image and the UBL QR reference. Free. Response: result with verdict (ACCEPTED | ACCEPTED_WITH_WARNINGS | REJECTED), findings[] (id, severity, message, fields, location, fix_hint, source = xsd | schematron | preflight), counts, ruleset version and timings, plus data_confidence, estimated_items[], sources[], data_version, warnings[] and a disclaimer. Documents are validated in memory and never stored or logged.

Input parameters:

- `certificate_signature`: Base64 (phase 2, simplified invoices).
- `ecdsa_signature`: Base64 (phase 2).
- `invoice_hash`: Base64 SHA-256 of the invoice (phase 2).
- `public_key`: Base64 (phase 2).
- `seller_name` (string, required)
- `timestamp` (string, required): ISO 8601, e.g. 2026-10-31T14:05:00Z
- `total_with_vat` (string, required): e.g. '1150.00'
- `vat_number` (string, required): KSA VAT number: 15 digits, starts and ends with 3.
- `vat_total` (string, required): e.g. '150.00'

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/tech-noahsarch-einvoice-preflight/einvoice#diagnostics

## Score history

- 2026-11-05: 68
- 2026-11-04: 68
- 2026-11-03: 67
- 2026-11-02: 67
- 2026-11-01: 66
- 2026-10-31: 66

## Common questions

### What is the GCC e-Invoice Preflight Oracle MCP server?

GCC e-Invoice Preflight Oracle is an MCP server listed in the public MCP registry as tech.noahsarch/einvoice-preflight. Validate UAE PINT AE and Saudi ZATCA e-invoices: UBL, official Schematron, QR, fix hints. This page covers its hosted endpoint (https://einvoice.noahsarch.tech/mcp).

### Is the GCC e-Invoice Preflight Oracle MCP server safe to use?

GCC e-Invoice Preflight Oracle scores 68 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 GCC e-Invoice Preflight Oracle MCP server expose?

GCC e-Invoice Preflight Oracle exposes 7 tools: validate_invoice, readiness_report, extract_summary, list_rules, check_trn, and 2 more. Their descriptions and schemas cost roughly 1,442 tokens of context every time the server is loaded.

### Does the GCC e-Invoice Preflight Oracle MCP server require authentication?

No. We connected to GCC e-Invoice Preflight Oracle without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the GCC e-Invoice Preflight Oracle MCP server still maintained?

GCC e-Invoice Preflight Oracle 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://einvoice.noahsarch.tech/mcp
- Website: https://agents.noahsarch.tech/
- Changelog RSS feed: https://verifymcp.io/servers/tech-noahsarch-einvoice-preflight/einvoice.xml
- Changelog JSON feed: https://verifymcp.io/servers/tech-noahsarch-einvoice-preflight/einvoice.json
- HTML version of this page: https://verifymcp.io/servers/tech-noahsarch-einvoice-preflight/einvoice