Is the UK Data: Tool catalogue MCP server safe?

No scan can promise that. What its definitions show: 3 tools, 1 of which can change, send or delete something, and 0 findings from fixed checks. Allow the reads, ask before each change, and deny the deletes; the permissions block on this page does that.

Can the UK Data: Tool catalogue 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: Tool catalogue 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: Tool catalogue MCP server have?

3 tools: 1 write, 2 read. call_tool, tool_search and list_apis.

Does the UK Data: Tool catalogue MCP server need sign-in or OAuth?

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

Does the UK Data: Tool catalogue 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: Tool catalogue MCP server changed its tools?

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

UK Data: Tool catalogue MCP server

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

Find the right tool for any need across every family and imported API, then call it by name

3 tools: 1 change things and 2 only read.

Reads private data · 0
Reads text others write · 3
Can send data out · 0
No findings

Tools listed without sign-in. Remote posture

With Anlyon

1 tool here changes things. Govern it.

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: Tool catalogue MCP server can do

The UK Data: Tool catalogue MCP server is published by reliness.co.uk, a domain the MCP Registry verified. It has 3 tools. It can create or change data (1 tool: call_tool), but cannot delete data. 2 tools only read.

3 tools bring in text other people can write (tool_search, call_tool and list_apis).

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.

3 tools

Changes things 1Creates or changes something that can be changed back.Claude Code: ask

call_toolCall any tool by name with an arguments object, including imported API operations (api__operation).Reads text others writeNo findings
Why it is in this group
- The name "call_tool" says "call": a word for a change.
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
Call any tool by name with an arguments object, including imported API operations (api__operation). Costs what the tool costs. (cost: 1 credit)
Annotations the server declares
- title: call tool
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

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

list_apisList imported APIs with operation counts.Reads text others writeNo findings
Why it is in this group
- The name "list_apis" says "list": 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
List imported APIs with operation counts. Free. (cost: 0 credit)
Annotations the server declares
- title: list apis
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
tool_searchDescribe what you need in plain words and get the best matching tools (native and imported APIs) with their parameters and how to call them.Reads text others writeNo findings
Why it is in this group
- The name "tool_search" says "search": 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
Describe what you need in plain words and get the best matching tools (native and imported APIs) with their parameters and how to call them. Free. (cost: 0 credit)
Annotations the server declares
- title: tool search
- 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 write3: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; call_tool
list_apis
tool_search
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, 12:21 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: 1
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

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 1 tool that changes things (1 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://ukdata.reliness.co.uk/mcp/catalogue: tools/list returned 3 tools to an anonymous client, including call_tool (write)
What this check looks for

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 catalogue https://ukdata.reliness.co.uk/mcp/catalogue

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

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__catalogue__tool_search",
      "mcp__catalogue__list_apis"
    ],
    "ask": [
      "mcp__catalogue__call_tool"
    ],
    "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 catalogue. Review it before you use it.

Capability tags behind 3 rules

mcp__catalogue__tool_search untrusted-input
mcp__catalogue__call_tool untrusted-input
mcp__catalogue__list_apis 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/catalogue/verify?hash=685f4f2031f1a3ea00336060be3e729b58fbd6afe24b68cdcde84c91466b8a45" | jq -e '.changed == false'

Pinned hash 685f4f2031f1, 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/catalogue/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/catalogue.svg)](https://anlyon.dev/servers/uk.co.reliness/catalogue)

Source: MCP Registry. Synced Nov 7, 2026, 00:17 UTC.