query_pix

THE RISK

Low Risk

Why query_pix needs a policy

This tool queries payment status information without triggering transactions, modifying records, or executing code. It is a read-only lookup of existing payment data. The low severity reflects minimal risk: retrieving payment status is informational and carries no blast radius for financial operations or data destruction.

From the tool's definition Tool name 'query_pix' and description state 'Retrieve a Pix charge' — a data retrieval operation with no modification or execution. Returns status and payment metadata only.

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

POLICY

How to control query_pix

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_pix:

policy.json

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

query_pix 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

Related tools and policies

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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_pix

What does the query_pix tool do? +

Retrieve a Pix charge by Getnet payment_id. Returns current status (PENDING, APPROVED, CANCELED) and, when paid, the Pix end-to-end id. 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_pix? +

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

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

Can I rate-limit query_pix? +

Yes. Add a rate_limit block to the query_pix 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_pix completely? +

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

query_pix 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 →