get_pix_qrcode

THE RISK

Critical Risk

Why get_pix_qrcode needs a policy

Pix QR codes are payment instruments; generating one is the first step in committing a financial transaction. Even though the tool itself returns a code rather than executing the transfer, it creates a binding payment request in the Pix protocol context. The server is explicitly described as handling payments (AP2 — Agent-to-Agent Payment Protocol), elevating this to Financial category.

From the tool's definition 'Get Pix QR code for a payment (returns payload and image)' — directly initiates a Pix payment flow by generating a payment QR code payload

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

POLICY

How to control get_pix_qrcode

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 get_pix_qrcode:

policy.json

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

Any call to get_pix_qrcode 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 get_pix_qrcode

What does the get_pix_qrcode tool do? +

Get Pix QR code for a payment (returns payload and image). 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 get_pix_qrcode? +

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

get_pix_qrcode 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 get_pix_qrcode? +

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

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

get_pix_qrcode 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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