query_boleto

THE RISK

Low Risk

Why query_boleto needs a policy

This tool only retrieves and queries payment boleto data (status, URL, barcode). It has no side effects—it neither modifies records, executes commands, deletes data, nor moves money. The context (AFIP Argentine tax authority, Getnet payment processing) confirms it is a lookup function for payment slip information already created by prior transactions.

From the tool's definition Tool name 'query_boleto' and description 'Retrieve a boleto' indicate a read-only operation. Returns 'current status, bank slip URL and barcode' with no modification, creation, deletion, or financial transaction capability.

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

POLICY

How to control query_boleto

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 query_boleto:

policy.json

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

query_boleto 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 →

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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 query_boleto

What does the query_boleto tool do? +

Retrieve a boleto by Getnet payment_id. Returns current status, bank slip URL and barcode. 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 query_boleto? +

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

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

Can I rate-limit query_boleto? +

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

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

query_boleto 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 →