create_pix_cob

THE RISK

Critical Risk

Why create_pix_cob needs a policy

This tool creates a Pix payment charge, which is a Brazilian instant payment instrument regulated by BACEN. Initiating a Pix charge commits a financial obligation and triggers a payment transaction. It falls squarely in the Financial category. Misuse by an AI agent could result in unauthorized payment requests being sent to payers, with real monetary consequences.

From the tool's definition Create an immediate Pix charge (cob) with QR code... BACEN Pix v2 standard

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

POLICY

How to control create_pix_cob

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 create_pix_cob:

policy.json

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

Any call to create_pix_cob 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 create_pix_cob

What does the create_pix_cob tool do? +

Create an immediate Pix charge (cob) with QR code. Returns txid, EMV copy-paste payload, and location URL. BACEN Pix v2 standard. 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 create_pix_cob? +

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

create_pix_cob 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 create_pix_cob? +

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

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

create_pix_cob 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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