validate_postal_code

THE RISK

Low Risk

Why validate_postal_code needs a policy

The tool performs a read-only query operation that validates coverage information and lists available services for a given postal code. It has no side effects, does not modify data, execute code, delete records, or move money. It is a simple lookup/validation operation similar to a search or fetch, making it a Read category tool.

From the tool's definition validate_postal_code describes a validation and information lookup operation: 'Validate CP coverage and list available services for a postal code'. This retrieves or queries data about postal code coverage and available services.

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

POLICY

How to control validate_postal_code

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 validate_postal_code:

policy.json

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

validate_postal_code 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.

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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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about validate_postal_code

What does the validate_postal_code tool do? +

Validate CP coverage and list available services for a postal code. 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 validate_postal_code? +

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

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

Can I rate-limit validate_postal_code? +

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

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

validate_postal_code 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 →