pve_reboot_vm · Proxmox MCP Server MCP: Risk & Policy

WHAT IT DOES

What pve_reboot_vm does on Proxmox MCP Server

AI agents invoke pve_reboot_vm to trigger actions in Proxmox 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 pve_reboot_vm needs a policy

Rebooting a VM is an Execute-category action: it triggers an external operation that disrupts running workloads, terminates active connections, and may cause data loss for unsaved in-memory state. It is not purely destructive (the VM and its data persist), but the blast radius is high since production VMs could be taken offline unexpectedly.

From the tool's definition 'Reboot a VM' — triggers an external operation (reboot) on a virtual machine via the Proxmox VE API

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pve_reboot_vm Rate-limited

pve_reboot_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": {
    "pve_reboot_vm": {
      "limits": [
        {
          "counter": "pve_reboot_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 Proxmox MCP Server, so you can run agents against it safely.

FAQ

Questions about pve_reboot_vm

What does the pve_reboot_vm tool do? +

Reboot a VM. It is categorised as a Execute tool in the Proxmox 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 pve_reboot_vm? +

Register the Proxmox MCP Server MCP server in PolicyLayer and add a rule for pve_reboot_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 Proxmox MCP Server. Nothing to install.

What risk level is pve_reboot_vm? +

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

Can I rate-limit pve_reboot_vm? +

Yes. Add a rate_limit block to the pve_reboot_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 pve_reboot_vm completely? +

Set action: deny in the PolicyLayer policy for pve_reboot_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 pve_reboot_vm? +

pve_reboot_vm is provided by the Proxmox MCP Server MCP server (mjrestivo16/mcp-proxmox). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.