oneclick_refund

THE RISK

Critical Risk

Why oneclick_refund needs a policy

This tool moves money (initiates refunds) and commits financial obligations by reversing charges. Refunds are irreversible financial operations that affect customer accounts and merchant balance sheets. The critical severity reflects high blast radius: an AI agent with unconstrained access could refund arbitrary transactions, causing substantial financial loss. This is the most severe risk category applicable.

From the tool's definition Tool name 'oneclick_refund' and description explicitly states 'Refund a OneClick Mall charge' — directly refunds financial transactions using buy_order identifiers.

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

POLICY

How to control oneclick_refund

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 oneclick_refund:

policy.json

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

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

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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 oneclick_refund

What does the oneclick_refund tool do? +

Refund a OneClick Mall charge. Parent buy_order identifies the mall transaction; detail_buy_order + commerce_code pinpoint the child to refund. 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 oneclick_refund? +

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

oneclick_refund 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 oneclick_refund? +

Yes. Add a rate_limit block to the oneclick_refund 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 oneclick_refund completely? +

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

oneclick_refund 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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