calculate_shipping

THE RISK

Low Risk

Why calculate_shipping needs a policy

This tool retrieves shipping rate data based on input parameters (two CEP/postal codes). It has no side effects, does not create, modify, or delete data, and does not commit any financial transactions. Despite being on an AP2 (payment protocol) server, the tool itself is a read-only lookup.

From the tool's definition Tool description states 'Calculate shipping rates between two CEPs' — a query operation that retrieves rate information without modifying data or executing transactions.

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

POLICY

How to control calculate_shipping

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 calculate_shipping:

policy.json

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

calculate_shipping 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.

CAP THIS TOOL →

Free to start. No card required.

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 calculate_shipping

What does the calculate_shipping tool do? +

Calculate shipping rates between two CEPs. 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 calculate_shipping? +

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

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

Can I rate-limit calculate_shipping? +

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

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

calculate_shipping 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.

CHECK YOUR STACK →