update_cluster_firewall_rule

A write tool on the Proxmox MCP server.

SERVERProxmox MCP Server SOURCEgethosthewalrus/proxmox-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/gethosthewalrus-proxmox-mcp/update-cluster-firewall-rule.md

WHAT IT DOES

What update_cluster_firewall_rule does on Proxmox MCP Server

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

RISK

Why update_cluster_firewall_rule is rated Medium

This tool modifies firewall rules, which is a reversible configuration change (Write category). However, the blast radius is high because misconfigured firewall rules can disrupt cluster networking, block legitimate traffic, or create security gaps affecting all infrastructure. The empty description prevents higher confidence, but the intent is clear from context and naming convention.

From the tool's definition Tool name 'update_cluster_firewall_rule' indicates modification of firewall rules at the cluster level. Sibling tools show this server manages critical infrastructure operations (bulk migrations, shutdowns, storage allocation).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_cluster_firewall_rule safely

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

update_cluster_firewall_rule Rate-limited

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

FAQ

Questions about update_cluster_firewall_rule

What does the update_cluster_firewall_rule tool do? +

update_cluster_firewall_rule is a write tool on the Proxmox MCP Server MCP server. It is categorised as a Write tool in the Proxmox MCP 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 update_cluster_firewall_rule? +

Register the Proxmox MCP Server MCP server in PolicyLayer and add a rule for update_cluster_firewall_rule: 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 update_cluster_firewall_rule? +

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

Can I rate-limit update_cluster_firewall_rule? +

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

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

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

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