clone_from_template · Libvirt MCP: Risk & Policy

WHAT IT DOES

What clone_from_template does on Libvirt

AI agents use clone_from_template to create or update resources in Libvirt — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Libvirt environment.

WHY IT NEEDS A POLICY

Why clone_from_template needs a policy

Cloning a VM from a template creates a new virtual machine instance, which is a Write operation (creates data reversibly). However, the empty description lowers confidence.

From the tool's definition Tool name 'clone_from_template' on a server for VM lifecycle management; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

clone_from_template Rate-limited

clone_from_template 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "clone_from_template": {
      "limits": [
        {
          "counter": "clone_from_template_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Libvirt, so you can run agents against it safely.

FAQ

Questions about clone_from_template

What does the clone_from_template tool do? +

clone_from_template. It is categorised as a Write tool in the Libvirt MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on clone_from_template? +

Register the Libvirt MCP server in PolicyLayer and add a rule for clone_from_template: 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 Libvirt. Nothing to install.

What risk level is clone_from_template? +

clone_from_template is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit clone_from_template? +

Yes. Add a rate_limit block to the clone_from_template 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.

How do I block clone_from_template completely? +

Set action: deny in the PolicyLayer policy for clone_from_template. 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.

What MCP server provides clone_from_template? +

clone_from_template is provided by the Libvirt MCP server (rzippert/libvirt-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.