List VM devices. Optionally filter by VM ID to see devices attached to a specific VM.
AI agents call vm_device_list to retrieve information from Truenas without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that retrieves information about VM devices. It performs no modifications, deletions, code execution, or financial transactions. The optional filtering by VM ID is a query parameter that does not alter system state. Blast radius is minimal as it only exposes infrastructure visibility information.
From the tool's definition Tool name 'vm_device_list' and description 'List VM devices' indicates data retrieval without side effects. The action is to query/enumerate devices attached to virtual machines.
Documented attack patterns abuse exactly the kind of access vm_device_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Truenas, and nothing reaches the server without passing your rules. This is the rule we recommend for vm_device_list:
{
"version": "1",
"default": "deny",
"tools": {
"vm_device_list": {}
}
}vm_device_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List VM devices. Optionally filter by VM ID to see devices attached to a specific VM. It is categorised as a Read tool in the Truenas MCP Server, which means it retrieves data without modifying state.
Register the Truenas MCP server in PolicyLayer and add a rule for vm_device_list: 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.
vm_device_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the vm_device_list 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 vm_device_list. 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.
vm_device_list 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.
Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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279 Truenas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.