refund_pix

THE RISK

Critical Risk

Why refund_pix needs a policy

This tool moves money by reversing Pix payments, which is a financial obligation and commitment. Misuse by an AI agent could result in unauthorized refunds, loss of merchant funds, and fraud. The tool operates on the Argentine tax authority's invoicing system but interfaces with actual payment reversals, making it a critical financial operation.

From the tool's definition Tool name 'refund_pix' and description explicitly states 'Refund (devolução) a previously received Pix' — a direct reversal of financial transfers in the Brazilian Pix instant payment system.

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

POLICY

How to control refund_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 refund_pix:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "refund_pix": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to refund_pix is blocked until a human approves it. The rest of the server keeps working.

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

Critical-risk tools in Mcp Afip → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about refund_pix

What does the refund_pix tool do? +

Refund (devolução) a previously received Pix. Must reference the original endToEndId and a merchant-side refund id. It is categorised as a Financial tool in the Mcp Afip MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on refund_pix? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for refund_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 refund_pix? +

refund_pix is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit refund_pix? +

Yes. Add a rate_limit block to the refund_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 refund_pix completely? +

Set action: deny in the PolicyLayer policy for refund_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 refund_pix? +

refund_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.

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