AI agents call list_hosts to retrieve information from CloudStack 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 information about CloudStack hosts without any side effects. Listing hosts is a non-destructive query operation that provides visibility into infrastructure but does not create, modify, delete, or execute anything. The severity is low because an AI agent misusing this to enumerate hosts poses minimal direct risk—it is reconnaissance-level access only.
From the tool's definition Tool name 'list_hosts' and description 'List hosts' indicate a simple retrieval operation with no modification, deletion, or execution capability. The verb 'list' is explicitly a read-only operation that queries infrastructure state.
Documented attack patterns abuse exactly the kind of access list_hosts gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CloudStack MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_hosts:
{
"version": "1",
"default": "deny",
"tools": {
"list_hosts": {}
}
}list_hosts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List hosts. It is categorised as a Read tool in the CloudStack MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CloudStack MCP Server MCP server in PolicyLayer and add a rule for list_hosts: 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 CloudStack MCP Server. Nothing to install.
list_hosts 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_hosts 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_hosts. 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_hosts is provided by the CloudStack MCP Server MCP server (phantosmax/cloudstack-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CloudStack MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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45 CloudStack MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.