AI agents use UnmountIso to create or update resources in Virtualization — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Virtualization environment.
Unmounting an ISO modifies the VM's configuration by removing the attached ISO media. This is a reversible action (the ISO can be re-mounted), so it falls under Write rather than Destructive. Misuse could disrupt VM operations if done at a critical time, warranting medium severity.
From the tool's definition Unmount an ISO from a virtual machine
Documented attack patterns abuse exactly the kind of access UnmountIso 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 UnmountIso:
{
"version": "1",
"default": "deny",
"tools": {
"UnmountIso": {
"limits": [
{
"counter": "unmountiso_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}UnmountIso stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Unmount an ISO from a virtual machine. It is categorised as a Write tool in the Virtualization MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Virtualization MCP server in PolicyLayer and add a rule for UnmountIso: 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.
UnmountIso is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the UnmountIso 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 UnmountIso. 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.
UnmountIso 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.