list_pix_payments

THE RISK

Low Risk

Why list_pix_payments needs a policy

This tool retrieves and queries payment data without creating, modifying, deleting, or executing financial transactions. However, Pix is a real Brazilian payment system, and listing payment records could expose sensitive financial transaction history. The 'medium' severity reflects that while the tool itself is read-only, unauthorized access to payment records poses a moderate confidentiality risk.

From the tool's definition Tool name contains 'list' and description states 'List outbound Pix payments with optional filters' — a retrieval operation. Description explicitly mentions 'reconciliation and agent-driven audit', which are Read-category use cases with no modification.

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

POLICY

How to control list_pix_payments

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 list_pix_payments:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_pix_payments": {}
  }
}

list_pix_payments is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_pix_payments

What does the list_pix_payments tool do? +

List outbound Pix payments with optional filters. Useful for reconciliation and agent-driven audit. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_pix_payments? +

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

list_pix_payments is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_pix_payments? +

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

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

list_pix_payments 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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