buy_label_range

THE RISK

Critical Risk

Why buy_label_range needs a policy

The tool name explicitly uses 'buy', indicating a purchase action. In the context of AFIP (Argentine tax authority) and electronic invoicing, purchasing a range of tracking labels (etiquetas) for a postal/shipping service (SIGEP) constitutes a financial commitment. This falls under Financial as it involves procuring goods/services with monetary implications.

From the tool's definition buy_label_range — 'buy' indicates a financial transaction; requesting a range of SIGEP tracking labels implies purchasing/procuring labels which commits financial obligations

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

POLICY

How to control buy_label_range

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 buy_label_range:

policy.json

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

Any call to buy_label_range is blocked until a human approves it. The rest of the server keeps working.

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EXPLORE

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Go deeper

Critical-risk tools in Mcp Afip → 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 buy_label_range

What does the buy_label_range tool do? +

Request a range of SIGEP tracking labels (etiquetas) for a service. It is categorised as a Financial tool in the Mcp Afip MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on buy_label_range? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for buy_label_range: 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 buy_label_range? +

buy_label_range 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 buy_label_range? +

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

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

buy_label_range 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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