create_vm · Virtualbox MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_vm does on Virtualbox MCP Server

AI agents invoke create_vm to trigger actions in Virtualbox MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why create_vm needs a policy

Creating a VM involves executing external processes (Vagrant/VirtualBox commands) that provision real infrastructure. While it is not purely destructive or financial, it executes significant external operations with resource implications (CPU, memory, disk, networking). Misuse could spin up many VMs, exhausting host resources or incurring cloud costs if backed by a cloud provider.

From the tool's definition 'Create a new Vagrant VM' — provisions and launches a new virtual machine via Vagrant, triggering external infrastructure operations

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_vm Rate-limited

create_vm stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_vm": {
      "limits": [
        {
          "counter": "create_vm_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about create_vm

What does the create_vm tool do? +

Create a new Vagrant VM. It is categorised as a Execute tool in the Virtualbox MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on create_vm? +

Register the Virtualbox MCP Server MCP server in PolicyLayer and add a rule for create_vm: 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 Virtualbox MCP Server. Nothing to install.

What risk level is create_vm? +

create_vm is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit create_vm? +

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

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

create_vm is provided by the Virtualbox MCP Server MCP server (usemanusai/virtualbox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.