List all VirtualBox virtual machines with their current states.
AI agents call ListVms to retrieve information from Virtualization without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns data about virtual machine states without creating, modifying, deleting, or executing any operations. It is a pure read operation with minimal blast radius—an AI agent misusing it could only access information about existing VMs, not alter infrastructure or execute commands.
From the tool's definition Tool name 'ListVms' and description 'List all VirtualBox virtual machines with their current states' indicate retrieval of information without modification or side effects.
Documented attack patterns abuse exactly the kind of access ListVms gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Virtualization, and nothing reaches the server without passing your rules. This is the rule we recommend for ListVms:
{
"version": "1",
"default": "deny",
"tools": {
"ListVms": {}
}
}ListVms is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all VirtualBox virtual machines with their current states. It is categorised as a Read tool in the Virtualization MCP Server, which means it retrieves data without modifying state.
Register the Virtualization MCP server in PolicyLayer and add a rule for ListVms: 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 Virtualization. Nothing to install.
ListVms 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 ListVms 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 ListVms. 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.
ListVms is provided by the Virtualization MCP server (sandraschi/virtualization-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Virtualization, 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.
56 Virtualization tools catalogued and risk-classified — across an index of 43,000+ MCP servers.