get_pix_charge_due

THE RISK

Low Risk

Why get_pix_charge_due needs a policy

This tool retrieves/queries data about an existing Pix charge status without creating, modifying, deleting, or executing any financial transaction. It is a passive information lookup against the Brazilian Central Bank (BCB) Pix system. While it may expose financial information, the tool itself performs no financial operation.

From the tool's definition Tool name 'get_pix_charge_due' and description 'Retrieve a due-dated Pix charge' indicate a read-only query operation. The underlying API endpoint 'BCB GET /cobv/{txid}' uses the HTTP GET method, which is idempotent and has no side effects.

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

POLICY

How to control get_pix_charge_due

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

policy.json

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

get_pix_charge_due 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 Afip — 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 →
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FAQ

Questions about get_pix_charge_due

What does the get_pix_charge_due tool do? +

Retrieve a due-dated Pix charge (BCB GET /cobv/{txid}). It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_pix_charge_due? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for get_pix_charge_due: 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 Afip. Nothing to install.

What risk level is get_pix_charge_due? +

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

Can I rate-limit get_pix_charge_due? +

Yes. Add a rate_limit block to the get_pix_charge_due 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_charge_due completely? +

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

get_pix_charge_due is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

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

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