register_passenger_app

THE RISK

Medium Risk

Why register_passenger_app needs a policy

Registering a Passenger app creates a new application configuration on the server. This is a Write operation (reversible — the app can be unregistered). It does not execute code directly, delete data, or involve financial transactions. Misuse could deploy unintended apps, hence medium severity.

From the tool's definition Register a new Node.js, Python, or Ruby application

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

POLICY

How to control register_passenger_app

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "register_passenger_app": {
      "limits": [
        {
          "counter": "register_passenger_app_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

register_passenger_app stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register cPanel MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT 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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about register_passenger_app

What does the register_passenger_app tool do? +

Register a new Node.js, Python, or Ruby application. It is categorised as a Write tool in the cPanel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on register_passenger_app? +

Register the cPanel MCP Server MCP server in PolicyLayer and add a rule for register_passenger_app: 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 cPanel MCP Server. Nothing to install.

What risk level is register_passenger_app? +

register_passenger_app is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit register_passenger_app? +

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

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

register_passenger_app is provided by the cPanel MCP Server MCP server (0xhayd3n/cpanel-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 cPanel MCP Server tool call.

Start from cPanel MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →