webpay_refund_transaction

THE RISK

Critical Risk

Why webpay_refund_transaction needs a policy

This tool directly moves money by refunding financial transactions. It commits financial obligations and reverses prior payments. The context (AFIP, Argentine tax authority, electronic invoicing) confirms this operates in a financial/payment domain. Misuse could result in unauthorized refunds, financial loss, or fraud.

From the tool's definition Tool name 'webpay_refund_transaction' and description explicitly state it 'Refund a committed Webpay Plus transaction' with ability to perform full or partial refunds. Webpay Plus is a payment processing system.

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

POLICY

How to control webpay_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 webpay_refund_transaction:

policy.json

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

Any call to webpay_refund_transaction 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.
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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 webpay_refund_transaction

What does the webpay_refund_transaction tool do? +

Refund a committed Webpay Plus transaction. Full refund if amount equals original; partial otherwise. 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 webpay_refund_transaction? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for webpay_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 webpay_refund_transaction? +

webpay_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 webpay_refund_transaction? +

Yes. Add a rate_limit block to the webpay_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 webpay_refund_transaction completely? +

Set action: deny in the PolicyLayer policy for webpay_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 webpay_refund_transaction? +

webpay_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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