get_cptec_airport_weather

THE RISK

Low Risk

Why get_cptec_airport_weather needs a policy

This tool retrieves publicly available weather information from a weather service. It takes an ICAO code as input and returns current meteorological data (METAR). There are no side effects, no data modification, no code execution, no deletion, and no financial implications. Misuse would have minimal blast radius — an agent could only retrieve weather data, which poses no security risk.

From the tool's definition Tool description states 'Get current airport weather (METAR) by ICAO code' — a retrieval operation with no modification or side effects. The verb 'Get' and the read-only nature of querying meteorological data confirm this is a Read operation.

Documented attack patterns abuse exactly the kind of access get_cptec_airport_weather gives an agent:

POLICY

How to control get_cptec_airport_weather

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for get_cptec_airport_weather:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_cptec_airport_weather": {}
  }
}

get_cptec_airport_weather 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 Mcp Ap2 — 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

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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_cptec_airport_weather

What does the get_cptec_airport_weather tool do? +

Get current airport weather (METAR) by ICAO code from CPTEC/INPE. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_cptec_airport_weather? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for get_cptec_airport_weather: 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 Mcp Ap2. Nothing to install.

What risk level is get_cptec_airport_weather? +

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

Can I rate-limit get_cptec_airport_weather? +

Yes. Add a rate_limit block to the get_cptec_airport_weather 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_cptec_airport_weather completely? +

Set action: deny in the PolicyLayer policy for get_cptec_airport_weather. 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_cptec_airport_weather? +

get_cptec_airport_weather is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →