firewall_delete_rule

Delete a firewall rule by UUID

SERVEROPNsense MCP Server SOURCEfakebizprez/opnsense-mcp-server

Critical RISK CLASS

Category Destructive

Parameters 00 required

Recommended Hiddensee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/fakebizprez-opnsense-mcp-server/firewall-delete-rule.md

WHAT IT DOES

What firewall_delete_rule does on OPNsense MCP Server

AI agents call firewall_delete_rule to permanently remove resources in OPNsense MCP Server, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

RISK

Why firewall_delete_rule is rated Critical

Deleting firewall rules is a destructive operation that cannot be undone and directly impacts security posture. An AI agent misusing this tool could remove critical rules protecting the network, causing immediate security exposure. This is more severe than Write (which is reversible) but not Financial.

From the tool's definition Tool name 'firewall_delete_rule' combined with description 'Delete a firewall rule by UUID' explicitly indicates irreversible deletion of firewall configuration data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs firewall_delete_rule safely

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

firewall_delete_rule Hidden

firewall_delete_rule is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "firewall_delete_rule"
  ]
}

RESTRICT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about firewall_delete_rule

What does the firewall_delete_rule tool do? +

Delete a firewall rule by UUID. It is categorised as a Destructive tool in the OPNsense MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on firewall_delete_rule? +

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

What risk level is firewall_delete_rule? +

firewall_delete_rule is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit firewall_delete_rule? +

Yes. Add a rate_limit block to the firewall_delete_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 firewall_delete_rule completely? +

Set action: deny in the PolicyLayer policy for firewall_delete_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 firewall_delete_rule? +

firewall_delete_rule is provided by the OPNsense MCP Server MCP server (fakebizprez/opnsense-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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