refund_sell_transaction

THE RISK

Critical Risk

Why refund_sell_transaction needs a policy

This tool moves money or commits financial obligations by processing refunds on financial transactions. The ability to refund sell transactions (converting assets to fiat) represents a direct financial operation that could result in unauthorized money transfers if misused by an AI agent.

From the tool's definition Tool description states 'Request a refund on an off-ramp (sell) transaction' and mentions handling rejected payouts and disputed trades.

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

POLICY

How to control refund_sell_transaction

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for refund_sell_transaction:

policy.json

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

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

Create a free account and register Mcp Ap2 — 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 Ap2 → 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_sell_transaction

What does the refund_sell_transaction tool do? +

Request a refund on an off-ramp (sell) transaction. Used when the destination bank rejects payout or the user disputes the trade. Reason codes are MoonPay-defined. It is categorised as a Financial tool in the Mcp Ap2 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on refund_sell_transaction? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for refund_sell_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 Ap2. Nothing to install.

What risk level is refund_sell_transaction? +

refund_sell_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_sell_transaction? +

Yes. Add a rate_limit block to the refund_sell_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_sell_transaction completely? +

Set action: deny in the PolicyLayer policy for refund_sell_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_sell_transaction? +

refund_sell_transaction is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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