list_countries

THE RISK

Low Risk

Why list_countries needs a policy

This is a straightforward data retrieval operation that queries configuration or reference data about geographic availability. It has no ability to modify data, execute operations, or cause financial transactions. The blast radius of misuse is minimal — an AI agent could only retrieve information about supported countries and payment flows, which does not compromise systems or data integrity.

From the tool's definition Tool name 'list_countries' and description 'List countries supported by MoonPay' — retrieves/queries a static list of supported countries and their payment flow capabilities. No side effects, data modification, or execution.

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

POLICY

How to control list_countries

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 list_countries:

policy.json

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

list_countries 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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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about list_countries

What does the list_countries tool do? +

List countries supported by MoonPay along with which flows (buy / sell / NFT) are allowed per geography. Use this to gate UI before initiating a quote. 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 list_countries? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for list_countries: 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 list_countries? +

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

Can I rate-limit list_countries? +

Yes. Add a rate_limit block to the list_countries 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 list_countries completely? +

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

list_countries 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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