ensure_passenger_deps

THE RISK

High Risk

Why ensure_passenger_deps needs a policy

This tool runs package manager commands (npm install, pip install) on the server, which constitutes executing external processes. This can install arbitrary code packages, potentially introducing malicious dependencies or consuming server resources. The blast radius is high as it could affect production application dependencies.

From the tool's definition Install/update dependencies for a registered application (npm install, pip install, etc.)

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

POLICY

How to control ensure_passenger_deps

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 ensure_passenger_deps:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ensure_passenger_deps": {
      "limits": [
        {
          "counter": "ensure_passenger_deps_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

ensure_passenger_deps stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in cPanel MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ensure_passenger_deps

What does the ensure_passenger_deps tool do? +

Install/update dependencies for a registered application (npm install, pip install, etc.). It is categorised as a Execute tool in the cPanel MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ensure_passenger_deps? +

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

ensure_passenger_deps is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit ensure_passenger_deps? +

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

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

ensure_passenger_deps 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 →