list_passenger_apps

THE RISK

Low Risk

Why list_passenger_apps needs a policy

This tool only retrieves information about deployed Passenger applications without creating, modifying, deleting, or executing anything. It is a straightforward read operation on the application registry with minimal security risk—the information returned would typically be accessible to account administrators anyway.

From the tool's definition Tool name 'list_passenger_apps' and description 'List all registered Node.js/Python/Ruby applications' indicate a retrieval/query operation with no modification or side effects.

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

POLICY

How to control list_passenger_apps

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 list_passenger_apps:

policy.json

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

list_passenger_apps 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 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.

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 list_passenger_apps

What does the list_passenger_apps tool do? +

List all registered Node.js/Python/Ruby applications. It is categorised as a Read tool in the cPanel MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_passenger_apps? +

Register the cPanel MCP Server MCP server in PolicyLayer and add a rule for list_passenger_apps: 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 list_passenger_apps? +

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

Can I rate-limit list_passenger_apps? +

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

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

list_passenger_apps 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 →