# `uk.co.reliness/reference` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/uk.co.reliness/reference
- JSON: https://anlyon.dev/api/v1/servers/uk.co.reliness/reference
- Version: 1.4.0 (active)
- Publisher: uk.co.reliness (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Metadata from the official MCP Registry, synced 2026-11-04T11:18:16.047Z

Title and description, as the publisher wrote them:

```untrusted-server-text
UK Data: Reference
Wikipedia summaries, books by ISBN, products by barcode, IP ownership, unit conversion
```

Scanned 2026-11-04T11:18:18.315Z over streamable-http.

**6 tools: 2 do something that can't be undone, 2 change things and 2 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 2 | ask |
| Changes things | write | 2 | ask |
| Only reads | read | 2 | allow |

## Exfil surface

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

| Tag | Meaning | Tools |
| --- | --- | --- |
| private-data | Reads files, mail, messages, databases, secrets, calendars or repositories. | none |
| untrusted-input | Brings in text someone else can write: web pages, inbound email, messages, issues and comments. | none |
| outbound | Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL. | `mcp__reference__convert_units` |

## Findings

No check matched anything in these tool definitions.


## Can't be undone (2)

Sends, pays, publishes or merges: once done, it cannot be taken back. Claude Code: ask.

### `convert_units`

- The name "convert_units" says "convert": a word for a change.
- The input addresses people (input.to): what it sends cannot be taken back.
- Tag outbound: The input takes a destination (input.to): what the tool writes goes there.

Description, as the server wrote it:

```untrusted-server-text
Convert length, mass, volume (UK and US), area, speed, energy, data, pressure and temperature. (cost: 1 credit)
```

### `format_money`

- The input carries an amount (input.amount) and a currency, so it moves money.

Description, as the server wrote it:

```untrusted-server-text
Format an amount in any currency and locale, compact form, and optionally in words (for cheques and contracts). (cost: 1 credit)
```

## Changes things (2)

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

### `product_barcode`

- Nothing in its name or description says what it does, so it is counted as a write.

Description, as the server wrote it:

```untrusted-server-text
Food product by barcode: name, brand, ingredients, allergens, Nutri-Score, nutrition per 100g. (cost: 1 credit)
```

### `wikipedia_summary`

- Nothing in its name or description says what it does, so it is counted as a write.

Description, as the server wrote it:

```untrusted-server-text
Lead summary, description, coordinates and Wikidata id for a Wikipedia article. (cost: 1 credit)
```

## Only reads (2)

Looks things up and changes nothing. Claude Code: allow.

### `book_lookup`

- The name "book_lookup" says "lookup": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Book details by ISBN, or search books by title or author. (cost: 1 credit)
```

### `ip_lookup`

- The name "ip_lookup" says "lookup": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Who owns an IP address: network name, range, country, organisations (RDAP). (cost: 1 credit)
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `reference`:

```json
{
  "permissions": {
    "allow": [
      "mcp__reference__book_lookup",
      "mcp__reference__ip_lookup"
    ],
    "ask": [
      "mcp__reference__wikipedia_summary",
      "mcp__reference__product_barcode",
      "mcp__reference__convert_units",
      "mcp__reference__format_money"
    ],
    "deny": []
  }
}
```

Capability tags behind the rules (a read tagged outbound is asked about):

- `mcp__reference__convert_units`: outbound