Is the UK Data: VAT number checks MCP server safe?

No scan can promise that. What its definitions show: 2 tools, all of which only read, and 0 findings from fixed checks. Read-only tools can still pass private data to a model.

Can the UK Data: VAT number checks MCP server delete data?

No tool is classed as destructive: going by their definitions, none of them deletes, cancels or revokes anything.

Can the UK Data: VAT number checks MCP server do things that cannot be undone?

No tool is classed as irreversible: none of them sends, pays, publishes or merges, going by their definitions.

What tools does the UK Data: VAT number checks MCP server have?

2 tools: 2 read. vat_check and uk_vat_check.

Does the UK Data: VAT number checks MCP server need sign-in or OAuth?

Its remote endpoint listed its tools to an anonymous client, without sign-in.

Does the UK Data: VAT number checks MCP server send data to outside services?

None of its tools sends, posts or publishes, or takes a recipient, channel or URL.

Has the UK Data: VAT number checks MCP server changed its tools?

Not since anlyon.dev started tracking it. Last scanned Nov 7, 2026.

UK Data: VAT number checks MCP server

uk.co.reliness/validationreliness.co.ukstreamable-httpv1.5.0Scanned 8 days ago

Check a UK or EU VAT number against official sources and get the registered name and address

2 tools: 2 only read.

Reads private data · 0
Reads text others write · 2
Can send data out · 0
No findings

Tools listed without sign-in. Remote posture

With Anlyon

Decide which of this server's tools your agent can use.

Anlyon lists the tools and adopts none.
Each tool you adopt gets approvals and receipts.
Your agent never holds the key.

Govern this server →

A tool your agent calls directly is not routed through Anlyon and is not governed by it. anlyon.dev only lists and labels, and these labels are the same either way.

What the UK Data: VAT number checks MCP server can do

The UK Data: VAT number checks MCP server is published by reliness.co.uk, a domain the MCP Registry verified. It has 2 tools. Every one of them only reads: going by their definitions, none of them creates, changes, sends or deletes anything.

2 tools bring in text other people can write (vat_check and uk_vat_check).

None of the fixed checks matched anything in its tool definitions. That is not a safety guarantee.

Its remote endpoint lists its tools without sign-in.

Last scanned Nov 7, 2026, version 1.5.0.

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

2 tools

Only reads 2Looks things up and changes nothing.Show 2 read-only tools

uk_vat_checkValidate a UK VAT registration number against the official HMRC register and return the registered business name and address.Reads text others writeNo findings
Why it is in this group
- The description's first verb is "validate": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Validate a UK VAT registration number against the official HMRC register and return the registered business name and address. For invoicing, supplier checks and VAT reclaim. (cost: 2 credits)
Annotations the server declares
- title: uk vat check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
vat_checkValidate a VAT number and get the registered business name and address.Reads text others writeNo findings
Why it is in this group
- The description's first verb is "validate": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Validate a VAT number and get the registered business name and address. EU numbers via the official VIES service, UK numbers via HMRC. Use for invoicing, supplier onboarding, tax and KYB checks. Accepts e.g. IE6388047V, DE811234567, GB553557881. (cost: 2 credits)
Annotations the server declares
- title: vat check
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write2: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; uk_vat_check
vat_check
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Nov 14, 2026, 12:24 UTC, unchanged since Nov 7, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 0
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.5.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http validation https://ukdata.reliness.co.uk/mcp/validation

claude mcp add --transport http validation https://ukdata.reliness.co.uk/mcp/validation

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__validation__vat_check",
      "mcp__validation__uk_vat_check"
    ],
    "ask": [],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as validation. Review it before you use it.

Capability tags behind 2 rules

mcp__validation__vat_check untrusted-input
mcp__validation__uk_vat_check untrusted-input

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/uk.co.reliness/validation/verify?hash=1b529cba5eb068baaf726ed992b7246564e0646446ca385f7393732047217680" | jq -e '.changed == false'

Pinned hash 1b529cba5eb0, from Nov 7, 2026, 00:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/uk.co.reliness/validation/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

[![anlyon.dev](https://anlyon.dev/badge/uk.co.reliness/validation.svg)](https://anlyon.dev/servers/uk.co.reliness/validation)

Source: MCP Registry. Synced Nov 7, 2026, 00:18 UTC.