buy_label_range

THE RISK

Critical Risk

Why buy_label_range needs a policy

Purchasing a range of shipping labels commits a financial obligation for each label acquired. The term 'buy' combined with a payment-protocol server context (AP2 — Agent-to-Agent Payment Protocol) strongly indicates this action results in a financial transaction or charge. Severity is high because bulk label purchasing could incur significant costs if misused by an AI agent.

From the tool's definition buy_label_range' — 'buy' implies a financial transaction; 'SIGEP tracking labels (etiquetas)' are purchased postal/shipping labels that carry direct financial cost

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 Ap2, 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 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 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 Ap2 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 Ap2 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 Ap2. 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 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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