get_currency

THE RISK

Low Risk

Why get_currency needs a policy

This is a read-only query that retrieves metadata about currency specifications. There is no creation, modification, deletion, code execution, or financial transaction involved. The data retrieved is informational only and helps format/validate financial amounts, not move money. Low severity because misuse poses minimal risk — an agent cannot harm systems or data by reading currency metadata.

From the tool's definition Tool description states 'Get details of a specific currency' — a retrieval operation with no side effects. Returns static reference data (precision, min/max amounts, type).

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

POLICY

How to control get_currency

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_currency:

policy.json

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

get_currency 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.

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_currency

What does the get_currency tool do? +

Get details of a specific currency (precision, min/max amounts, type). 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_currency? +

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

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

Can I rate-limit get_currency? +

Yes. Add a rate_limit block to the get_currency 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_currency completely? +

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

get_currency 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.

CHECK YOUR STACK →