pfsense_update_interface_vlan · Pfsense MCP: Risk & Policy

WHAT IT DOES

What pfsense_update_interface_vlan does on Pfsense

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

WHY IT NEEDS A POLICY

Why pfsense_update_interface_vlan needs a policy

The tool name contains 'update' suggesting a write/modify operation on VLAN interface configuration. Modifying VLAN interfaces on a firewall can significantly impact network segmentation and connectivity, making this high severity. Confidence is reduced due to empty description, but the naming pattern is consistent with other pfSense MCP write tools in this server.

From the tool's definition Tool name: pfsense_update_interface_vlan — 'update' implies modification; VLAN interface configuration on a firewall

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pfsense_update_interface_vlan Rate-limited

pfsense_update_interface_vlan 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": {
    "pfsense_update_interface_vlan": {
      "limits": [
        {
          "counter": "pfsense_update_interface_vlan_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Pfsense, so you can run agents against it safely.

FAQ

Questions about pfsense_update_interface_vlan

What does the pfsense_update_interface_vlan tool do? +

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

How do I enforce a policy on pfsense_update_interface_vlan? +

Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_update_interface_vlan: 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 Pfsense. Nothing to install.

What risk level is pfsense_update_interface_vlan? +

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

Can I rate-limit pfsense_update_interface_vlan? +

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

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

pfsense_update_interface_vlan is provided by the Pfsense MCP server (abl030/pfsense-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.