AI agents call list_subdomains to retrieve information from cPanel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves subdomain information from a cPanel account without creating, modifying, or deleting any resources. It is a straightforward data retrieval function with no side effects. The severity is low because while subdomain enumeration could inform reconnaissance, unauthorized access to the MCP server itself is the primary control, and this tool simply returns existing configuration data.
From the tool's definition Tool name 'list_subdomains' and description 'List all subdomains' indicate a query operation that retrieves data without modification. The verb 'list' is a classic read-only operation.
Documented attack patterns abuse exactly the kind of access list_subdomains gives an agent:
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_subdomains:
{
"version": "1",
"default": "deny",
"tools": {
"list_subdomains": {}
}
}list_subdomains is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List all subdomains. It is categorised as a Read tool in the cPanel MCP Server MCP Server, which means it retrieves data without modifying state.
Register the cPanel MCP Server MCP server in PolicyLayer and add a rule for list_subdomains: 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.
list_subdomains is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_subdomains 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.
Set action: deny in the PolicyLayer policy for list_subdomains. 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.
list_subdomains 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.
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.
Free to start. No card required.
164 cPanel MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.