# `uk.co.section13online/section13-online` 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.section13online/section13-online
- JSON: https://anlyon.dev/api/v1/servers/uk.co.section13online/section13-online
- Version: 0.1.1 (active)
- Publisher: uk.co.section13online (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Metadata from the official MCP Registry, synced 2026-11-06T10:18:21.245Z

Title and description, as the publisher wrote them:

```untrusted-server-text
Section13Online
Section 13 notice dates and eligibility for England. Read-only guidance, not legal advice.
```

Scanned 2026-11-06T10:18:24.360Z over streamable-http.

**2 tools: 1 change things and 1 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 1 | ask |
| Only reads | read | 1 | allow |

## Exfil surface

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

| 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. | none |

## Findings

No check matched anything in these tool definitions.


## Changes things (1)

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

### `calculate_notice_dates`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Calculate the earliest permissible start date for a Section 13 (Form 4A) rent increase for an assured periodic tenancy in England, and the latest date to serve the notice. Use when a UK landlord asks about raising rent, Section 13 notice periods, Form 4A timing, or when a rent increase can take effect. England only; general guidance, not legal advice; does not create or serve a notice.
```

## Only reads (1)

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

### `get_eligibility_requirements`

- The name "get_eligibility_requirements" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
List the eligibility requirements for increasing rent with a Section 13 notice (Form 4A) for an assured periodic tenancy in England. Use when someone asks whether they can use Section 13, what the rules for a rent increase are, or what Form 4A is. England only; general guidance, not legal advice.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `section13-online`:

```json
{
  "permissions": {
    "allow": [
      "mcp__section13-online__get_eligibility_requirements"
    ],
    "ask": [
      "mcp__section13-online__calculate_notice_dates"
    ],
    "deny": []
  }
}
```

## Remote posture

What an anonymous client saw at the remote endpoint, last 2026-11-14T12:21:34.871Z, unchanged since 2026-11-07T05:20:15.382Z. No credentials were sent and no tool was called. Values are shown as the endpoint returned them. Method: https://anlyon.dev/methodology#remote-posture

| Fact | Observed |
| --- | --- |
| 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 | `none` |
| RFC 9728 protected resource metadata | `none` |
| Authorization servers | `none` |
| Legacy HTTP+SSE transport | `no` |
| Dynamic client registration | `not observed` |
| Client ID metadata documents | `not observed` |

- **warn** Tools that change things, listed to anyone ([unauth-remote-writes](https://anlyon.dev/methodology#unauth-remote-writes))

```untrusted-server-text
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.

https://section13online.co.uk/api/mcp: tools/list returned 2 tools to an anonymous client, including calculate_notice_dates (write)
```