vm_create

Create a new virtual machine. At minimum provide a name and memory (in MiB). Other fields have sensible defaults.

SERVERTruenas SOURCEspranab/truenas-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/vm-create.md

WHAT IT DOES

What vm_create does on Truenas

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

RISK

Why vm_create is rated Medium

This tool creates a new VM resource on TrueNAS SCALE. It is a Write operation (creates a new entity reversibly — the VM can be deleted afterward). The severity is high because creating VMs consumes significant system resources (memory, storage, CPU) and could be misused to exhaust system capacity or deploy unauthorized workloads.

From the tool's definition Create a new virtual machine. At minimum provide a name and memory (in MiB).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs vm_create safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Truenas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For vm_create, this is the rule to start with:

vm_create Rate-limited

vm_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": {
    "vm_create": {
      "limits": [
        {
          "counter": "vm_create_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Truenas, apply this rule, and every vm_create call is checked against it from then on.

FAQ

Questions about vm_create

What does the vm_create tool do? +

Create a new virtual machine. At minimum provide a name and memory (in MiB). Other fields have sensible defaults. It is categorised as a Write tool in the Truenas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vm_create? +

Register the Truenas MCP server in PolicyLayer and add a rule for vm_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 Truenas. Nothing to install.

What risk level is vm_create? +

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

Can I rate-limit vm_create? +

Yes. Add a rate_limit block to the vm_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 vm_create completely? +

Set action: deny in the PolicyLayer policy for vm_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 vm_create? +

vm_create is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Truenas, and thousands of servers like it.

This server

All 279 Truenas tools →

Across the catalogue

create_task on 0rca Dojo MCP Server →create-task on Kanban MCP Server →create_package_backup on Android Forensics ADB MCP Server →create_project on Stitch MCP Server → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →