refund_transaction

THE RISK

Critical Risk

Why refund_transaction needs a policy

Refunds are direct financial obligations that move money back to a customer or account. This is inherently a Financial category tool. The critical severity is appropriate because: (1) it directly transfers funds, (2) it operates on settled transactions (high-value operations), (3) partial refunds add complexity and potential for abuse (e.g., refunding wrong amounts), and (4) if triggered by a compromised AI agent,…

From the tool's definition The tool description explicitly states it 'Refund[s] a settled transaction' and mentions amounts in the context of financial transactions. It handles money movement with optional partial refund capability ('pass a smaller amount').

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

POLICY

How to control refund_transaction

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_transaction:

policy.json

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

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

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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_transaction

What does the refund_transaction tool do? +

Refund a settled transaction via refundTransaction. Amount defaults to the full settled amount when omitted. For partial refunds, pass a smaller amount. 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_transaction? +

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

refund_transaction 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_transaction? +

Yes. Add a rate_limit block to the refund_transaction 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_transaction completely? +

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

refund_transaction 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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