get_cptec_cities

THE RISK

Low Risk

Why get_cptec_cities needs a policy

This is a straightforward data retrieval tool that searches for cities in the CPTEC/INPE (Brazilian weather service) database to support weather forecast lookups. It has no side effects, does not modify data, and does not trigger external operations beyond returning matching results. The risk is minimal—misuse would at worst return incorrect city information for weather queries.

From the tool's definition Tool name 'get_cptec_cities' and description 'Search CPTEC/INPE cities by name for weather forecasts' indicate a query/search operation that retrieves city data without modifying, executing, or deleting anything.

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 Afip, 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 Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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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 Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_cptec_cities? +

Register the Mcp Afip 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 Afip. 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 Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

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

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