get-metar

THE RISK

Low Risk

Why get-metar needs a policy

This tool retrieves and queries weather data from aviationweather.gov without creating, modifying, or deleting any data. It has no side effects beyond fetching observations. The blast radius of misuse is minimal—an agent could fetch irrelevant weather data or make excessive requests, but cannot alter aviation systems or cause operational harm. This is a straightforward data retrieval operation.

From the tool's definition Tool name 'get-metar' and description 'Fetch current METAR weather observations' indicate data retrieval with no modifications. METAR (Meteorological Aerodrome Report) is a read-only aviation weather observation standard.

Documented attack patterns abuse exactly the kind of access get-metar gives an agent:

POLICY

How to control get-metar

PolicyLayer is an MCP gateway — it sits between your AI agents and Aviation Weather MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get-metar:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get-metar": {}
  }
}

get-metar is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Aviation Weather MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Aviation Weather MCP Server tools

Read check-vfr-minimums Check if weather conditions meet VFR minimums Read decode-metar Decode a raw METAR string into human-readable format Read determine-flight-category Determine the flight category (VFR/MVFR/IFR/LIFR) for given weather conditions Read get-airmets Fetch current AIRMETs (Airmen\ Read get-pireps Fetch pilot reports (PIREPs) for a geographic area Read get-station-info Get detailed information about an airport or weather station Read get-taf Fetch TAF (Terminal Aerodrome Forecast) for one or more airports Read get-weather-along-route Get weather conditions along a flight route

All 10 Aviation Weather MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get-metar

What does the get-metar tool do? +

Fetch current METAR weather observations for one or more airports. It is categorised as a Read tool in the Aviation Weather MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get-metar? +

Register the Aviation Weather MCP Server MCP server in PolicyLayer and add a rule for get-metar: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Aviation Weather MCP Server. Nothing to install.

What risk level is get-metar? +

get-metar is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get-metar? +

Yes. Add a rate_limit block to the get-metar rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block get-metar completely? +

Set action: deny in the PolicyLayer policy for get-metar. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides get-metar? +

get-metar is provided by the Aviation Weather MCP Server MCP server (zealoushacker/aviation-weather-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Aviation Weather MCP Server tool call.

Start from Aviation Weather MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →