proxmox_vm_firewall_set

A write tool on the MCP Proxmox MCP server.

SERVERMCP Proxmox Server SOURCEbsahane/mcp-proxmox

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/bsahane-mcp-proxmox/proxmox-vm-firewall-set.md

WHAT IT DOES

What proxmox_vm_firewall_set does on MCP Proxmox Server

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

RISK

Why proxmox_vm_firewall_set is rated Medium

This tool modifies firewall rules on virtual machines, which is a reversible configuration change (Write category). However, it carries high severity due to the blast radius: misconfigured firewall rules could expose VMs to unauthorized access, disrupting security posture across the infrastructure.

From the tool's definition Tool name contains 'firewall_set' indicating configuration modification of VM firewall rules. Server description emphasizes 'full access to Proxmox API functionality' and 'comprehensive management' of virtualization infrastructure.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs proxmox_vm_firewall_set safely

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

proxmox_vm_firewall_set Rate-limited

proxmox_vm_firewall_set 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": {
    "proxmox_vm_firewall_set": {
      "limits": [
        {
          "counter": "proxmox_vm_firewall_set_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 MCP Proxmox Server, apply this rule, and every proxmox_vm_firewall_set call is checked against it from then on.

FAQ

Questions about proxmox_vm_firewall_set

What does the proxmox_vm_firewall_set tool do? +

proxmox_vm_firewall_set is a write tool on the MCP Proxmox Server MCP server. It is categorised as a Write tool in the MCP Proxmox Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on proxmox_vm_firewall_set? +

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

What risk level is proxmox_vm_firewall_set? +

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

Can I rate-limit proxmox_vm_firewall_set? +

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

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

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

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