register_boleto

THE RISK

Critical Risk

Why register_boleto needs a policy

Issuing a boleto creates a legally binding payment obligation in the Brazilian banking system. This is a financial instrument that can be used to collect money, constituting a direct financial action with real monetary consequences if misused.

From the tool's definition Issue a boleto via BB Cobranças — issues a financial payment instrument (boleto bancário) through a banking service, returning payment codes and barcode

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

POLICY

How to control register_boleto

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 register_boleto:

policy.json

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

Any call to register_boleto 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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All 1300 Mcp Ap2 tools →

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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 register_boleto

What does the register_boleto tool do? +

Issue a boleto via BB Cobranças. Returns nosso_numero, linha digitável, barcode, and PDF URL. 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 register_boleto? +

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

register_boleto 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 register_boleto? +

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

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

register_boleto 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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