snapshot_create · Libvirt MCP: Risk & Policy

WHAT IT DOES

What snapshot_create does on Libvirt

AI agents use snapshot_create 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 snapshot_create needs a policy

Creating a snapshot is a Write operation: it generates a new persistent artifact (the snapshot) but does not irreversibly destroy or overwrite existing data. It is reversible in that the snapshot can be removed.

From the tool's definition 'Create a snapshot of a domain' — creates new data (a snapshot) reversibly; snapshots can be deleted later via snapshot_delete

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

snapshot_create Rate-limited

snapshot_create 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": {
    "snapshot_create": {
      "limits": [
        {
          "counter": "snapshot_create_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 snapshot_create

What does the snapshot_create tool do? +

Create a snapshot of a domain. 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 snapshot_create? +

Register the Libvirt MCP server in PolicyLayer and add a rule for snapshot_create: 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 snapshot_create? +

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

Can I rate-limit snapshot_create? +

Yes. Add a rate_limit block to the snapshot_create 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 snapshot_create completely? +

Set action: deny in the PolicyLayer policy for snapshot_create. 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 snapshot_create? +

snapshot_create 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.

// THE FULL RECORD

snapshot_create is one line of Libvirt's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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