finalize_dispute

THE RISK

Critical Risk

Why finalize_dispute needs a policy

This tool directly manipulates financial dispute outcomes by locking in evidence submission to card networks. Misuse could result in fraudulent chargebacks being finalized, legitimate disputes being closed prematurely, or financial liability being triggered. While not a direct fund transfer, it commits financial obligations and irreversibly advances dispute resolution processes that affect money.

From the tool's definition Tool finalizes disputes in a payment protocol system (AP2 — Google's Agent-to-Agent Payment Protocol); dispute finalization involves submission to card networks, which are financial gatekeepers.

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

POLICY

How to control finalize_dispute

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 finalize_dispute:

policy.json

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

Any call to finalize_dispute 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 finalize_dispute

What does the finalize_dispute tool do? +

Finalize a dispute via finalizeDispute — submits previously added evidence to the card network for review. After finalization, no further evidence can be added. 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 finalize_dispute? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for finalize_dispute: 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 finalize_dispute? +

finalize_dispute 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 finalize_dispute? +

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

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

finalize_dispute 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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