refund_pix_payment

THE RISK

Critical Risk

Why refund_pix_payment needs a policy

This tool directly reverses financial transactions by refunding Pix payments. It commits financial obligations (money movement) and has high blast radius if misused by an agent—an AI could refund arbitrary amounts to unauthorized parties, causing direct monetary loss. Financial category takes precedence over all others per severity rules.

From the tool's definition Tool description explicitly states 'Refund (devolução) a Pix payment' and 'Supports full or partial amount'. Pix is Brazil's instant payment system. Refunding payments moves money back to customers and commits financial obligations.

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

POLICY

How to control refund_pix_payment

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_payment:

policy.json

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

Any call to refund_pix_payment 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_payment

What does the refund_pix_payment tool do? +

Refund (devolução) a Pix payment. Supports full or partial amount. Use reason codes per BCB MED catalog. 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_payment? +

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

refund_pix_payment 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_payment? +

Yes. Add a rate_limit block to the refund_pix_payment 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_payment completely? +

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

refund_pix_payment 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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