List all available ISO files in the VirtualBox media library.
AI agents call ListIsos 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 retrieves information about available ISO files without creating, modifying, deleting, or executing anything. It is a simple read-only query operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'ListIsos' and description 'List all available ISO files in the VirtualBox media library' indicate a query/retrieval operation with no modification or execution.
Documented attack patterns abuse exactly the kind of access ListIsos 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 ListIsos:
{
"version": "1",
"default": "deny",
"tools": {
"ListIsos": {}
}
}ListIsos 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 available ISO files in the VirtualBox media library. 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 ListIsos: 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.
ListIsos 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 ListIsos 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 ListIsos. 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.
ListIsos 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.
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56 Virtualization tools catalogued and risk-classified — across an index of 43,000+ MCP servers.