check_pec

THE RISK

Low Risk

Why check_pec needs a policy

This tool performs a lookup or availability check on a PEC (Posta Elettronica Certificata) address, which is a read-only operation that queries external data. It has no side effects, does not execute arbitrary code, does not modify data, and does not involve financial transactions.

From the tool's definition Tool description states it 'Checks if a specific PEC (Certified Email) address is available' — a query operation that retrieves status information about an email address without modifying or deleting data.

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

POLICY

How to control check_pec

PolicyLayer is an MCP gateway — it sits between your AI agents and Openapi Mcp Sdk, and nothing reaches the server without passing your rules. This is the rule we recommend for check_pec:

policy.json

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

check_pec 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 Openapi Mcp Sdk — 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

Related tools and policies

More Openapi Mcp Sdk tools

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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 check_pec

What does the check_pec tool do? +

Checks if a specific PEC (Certified Email) address is available. It is categorised as a Read tool in the Openapi Mcp Sdk MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_pec? +

Register the Openapi Mcp Sdk MCP server in PolicyLayer and add a rule for check_pec: 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 Openapi Mcp Sdk. Nothing to install.

What risk level is check_pec? +

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

Can I rate-limit check_pec? +

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

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

check_pec is provided by the Openapi Mcp Sdk MCP server (openapi/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Openapi Mcp Sdk tool call.

Start from Openapi Mcp Sdk, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →