check-vfr-minimums

THE RISK

Low Risk

Why check-vfr-minimums needs a policy

This tool retrieves and analyzes existing aviation weather data to determine compliance with Visual Flight Rules (VFR) minimums. It performs a read-only comparison operation with no side effects, no external code execution, and no data modification. The tool cannot cause harm through misuse beyond providing incorrect information, making it a low-severity Read operation.

From the tool's definition Tool name 'check-vfr-minimums' and description 'Check if weather conditions meet VFR minimums' indicate a query/comparison operation against aviation weather data.

Documented attack patterns abuse exactly the kind of access check-vfr-minimums gives an agent:

POLICY

How to control check-vfr-minimums

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 check-vfr-minimums:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "check-vfr-minimums": {}
  }
}

check-vfr-minimums 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 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-metar Fetch current METAR weather observations for one or more airports 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 check-vfr-minimums

What does the check-vfr-minimums tool do? +

Check if weather conditions meet VFR minimums. 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 check-vfr-minimums? +

Register the Aviation Weather MCP Server MCP server in PolicyLayer and add a rule for check-vfr-minimums: 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 check-vfr-minimums? +

check-vfr-minimums is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit check-vfr-minimums? +

Yes. Add a rate_limit block to the check-vfr-minimums 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 check-vfr-minimums completely? +

Set action: deny in the PolicyLayer policy for check-vfr-minimums. 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 check-vfr-minimums? +

check-vfr-minimums 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 →