get_official_rate

THE RISK

Low Risk

Why get_official_rate needs a policy

This tool retrieves historical or current exchange rate data from BCRA (Argentine Central Bank). It performs no modifications, deletions, financial transactions, or code execution. It is a simple data lookup with no capacity for side effects, making it a Read category tool with low severity.

From the tool's definition Tool name 'get_official_rate' and description 'Get the official BCRA quote for a single currency on a specific date' indicate a retrieval operation with no side effects. 'Get' is a read verb, and querying a public exchange rate is a query operation.

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

POLICY

How to control get_official_rate

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_official_rate:

policy.json

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

get_official_rate 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about get_official_rate

What does the get_official_rate tool do? +

Get the official BCRA quote for a single currency on a specific date. 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_official_rate? +

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

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

Can I rate-limit get_official_rate? +

Yes. Add a rate_limit block to the get_official_rate 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_official_rate completely? +

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

get_official_rate 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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