list_currency_types

THE RISK

Low Risk

Why list_currency_types needs a policy

This tool queries and returns a static list of supported currencies. It performs no modifications, deletions, financial transactions, or code execution. Despite being on a financial/payment protocol server (AP2), this specific tool only reads configuration data and presents no risk of misuse—an agent cannot cause harm by retrieving currency information.

From the tool's definition Tool name is 'list_currency_types' and description states 'List supported currencies' — a pure retrieval operation with no side effects.

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

POLICY

How to control list_currency_types

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 list_currency_types:

policy.json

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

list_currency_types 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 list_currency_types

What does the list_currency_types tool do? +

List supported currencies (FEParamGetTiposMonedas). 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 list_currency_types? +

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

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

Can I rate-limit list_currency_types? +

Yes. Add a rate_limit block to the list_currency_types 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_currency_types completely? +

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

list_currency_types 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 →