Can the UK Data: Airport weather (METAR and TAF) 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: Airport weather (METAR and TAF) 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.

Does the UK Data: Airport weather (METAR and TAF) MCP server need sign-in or OAuth?

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

Does the UK Data: Airport weather (METAR and TAF) 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: Airport weather (METAR and TAF) MCP server changed its tools?

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

UK Data: Airport weather (METAR and TAF) MCP server

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

Official airport weather: METAR observations and TAF forecasts from the NOAA Aviation Weather Center

4 tools: 4 change things.

Reads private data · 0
Reads text others write · 4
Can send data out · 0
No findings

Tools listed without sign-in. Remote posture

With Anlyon

4 tools here change things. Govern them.

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: Airport weather (METAR and TAF) MCP server can do

The UK Data: Airport weather (METAR and TAF) MCP server is published by reliness.co.uk, a domain the MCP Registry verified. It has 4 tools. It can create or change data (4 tools: metar_latest, metar_history, taf_forecast and pireps_near_airport), but cannot delete data. None of its tools only reads.

4 tools bring in text other people can write (metar_latest, metar_history, taf_forecast and 1 more).

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.

4 tools

Changes things 4Creates or changes something that can be changed back.Claude Code: ask

metar_historyEvery METAR observation for one airport over the last N hours (up to 30 days), decoded and oldest first, plus a summary of the high and low temperature, strongest gust, flight-cate…Reads text others writeNo findings
Why it is in this group
- 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.
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
Every METAR observation for one airport over the last N hours (up to 30 days), decoded and oldest first, plus a summary of the high and low temperature, strongest gust, flight-category low point and the weather reported. For checking what actually happened at a station: rain, gusts, fog, when it cleared. Source: NOAA/NWS Aviation Weather Center. The API returns at most 400 reports per call (about 8 days at half-hourly stations); not for flight planning. (cost: 1 credit)
Annotations the server declares
- title: metar history
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
metar_latestWhat the weather is right now at one or more airports: the latest official METAR observation decoded into temperature (C and F), dew point, humidity, wind and gusts, visibility, cl…Reads text others writeNo findings
Why it is in this group
- 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.
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
What the weather is right now at one or more airports: the latest official METAR observation decoded into temperature (C and F), dew point, humidity, wind and gusts, visibility, cloud and ceiling, pressure and flight category. Answers "what is the temperature at Heathrow right now" with the actual station reading, not a model forecast. Source: NOAA/NWS Aviation Weather Center (worldwide airports). Only stations that reported in the last 2 hours are returned; not for flight planning. (cost: 1 credit)
Annotations the server declares
- title: metar latest
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
pireps_near_airportRecent pilot reports (PIREPs) within a distance of an airport: turbulence and icing with intensity, altitude, aircraft type and time, plus a tally of how many reports found none, l…Reads text others writeNo findings
Why it is in this group
- 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.
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
Recent pilot reports (PIREPs) within a distance of an airport: turbulence and icing with intensity, altitude, aircraft type and time, plus a tally of how many reports found none, light, moderate or severe turbulence. PIREPs are the only first-hand reports of turbulence actually encountered, so they answer "is it bumpy around Denver right now" for pilots and nervous flyers. Source: NOAA/NWS Aviation Weather Center; coverage is mainly the United States. Reports are sparse and individual; not for flight planning. (cost: 1 credit)
Annotations the server declares
- title: pireps near airport
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
taf_forecastThe current Terminal Aerodrome Forecast (TAF) for an airport: the official 24-30 hour forecast for wind, visibility, weather and cloud at the airfield, decoded into time blocks wit…Reads text others writeNo findings
Why it is in this group
- 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.
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
The current Terminal Aerodrome Forecast (TAF) for an airport: the official 24-30 hour forecast for wind, visibility, weather and cloud at the airfield, decoded into time blocks with plain-English change types (temporary, becoming, 30% chance). Answers "will it be foggy or windy at the airport tomorrow morning". Source: NOAA/NWS Aviation Weather Center (worldwide airports that issue TAFs). Covers the airfield only, not the route; not for flight planning. (cost: 1 credit)
Annotations the server declares
- title: taf forecast
- 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 write4: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; metar_history
metar_latest
pireps_near_airport
taf_forecast
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: 4
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 4 tools that change things (4 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://ukdata.reliness.co.uk/mcp/weather-observations: tools/list returned 4 tools to an anonymous client, including metar_latest (write), metar_history (write), taf_forecast (write), pireps_near_airport (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 weather-observations https://ukdata.reliness.co.uk/mcp/weather-observations

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

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": [],
    "ask": [
      "mcp__weather-observations__metar_latest",
      "mcp__weather-observations__metar_history",
      "mcp__weather-observations__taf_forecast",
      "mcp__weather-observations__pireps_near_airport"
    ],
    "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 weather-observations. Review it before you use it.

Capability tags behind 4 rules

mcp__weather-observations__metar_latest untrusted-input
mcp__weather-observations__metar_history untrusted-input
mcp__weather-observations__taf_forecast untrusted-input
mcp__weather-observations__pireps_near_airport 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/weather-observations/verify?hash=5c1e16ade68b2721fcb0e4afa65c77aee5a97d0174d3115445afa34d41356cfc" | jq -e '.changed == false'

Pinned hash 5c1e16ade68b, 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/weather-observations/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/weather-observations.svg)](https://anlyon.dev/servers/uk.co.reliness/weather-observations)

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