get_cptec_cities

THE RISK

Low Risk

Why get_cptec_cities needs a policy

This tool performs a search query to retrieve city information for weather forecast purposes. It has no side effects, does not modify data, does not execute arbitrary code, and does not involve financial operations. Despite the server's focus on payments (AP2 protocol), this particular tool is a read-only lookup operation. The low severity reflects minimal blast radius if misused by an AI agent.

From the tool's definition Tool description states 'Search CPTEC/INPE cities by name for weather forecasts' — a query operation that retrieves geographic data without modifying, executing external code, or causing financial transactions.

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

POLICY

How to control get_cptec_cities

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_cities:

policy.json

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

get_cptec_cities 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 →

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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_cities

What does the get_cptec_cities tool do? +

Search CPTEC/INPE cities by name for weather forecasts. 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_cities? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for get_cptec_cities: 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_cities? +

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

Can I rate-limit get_cptec_cities? +

Yes. Add a rate_limit block to the get_cptec_cities 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_cities completely? +

Set action: deny in the PolicyLayer policy for get_cptec_cities. 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_cities? +

get_cptec_cities 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 →