set_firewall_settings · Firegex MCP: Risk & Policy

WHAT IT DOES

What set_firewall_settings does on Firegex

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

WHY IT NEEDS A POLICY

Why set_firewall_settings needs a policy

This tool modifies firewall settings, which is a Write operation. However, the severity is elevated to 'high' because misconfiguration of firewall rules could have significant security impact (blocking legitimate traffic, allowing malicious traffic, compromising network defenses), even though the action itself is theoretically reversible if the old configuration is known.

From the tool's definition Tool description states 'Replace the firewall settings' — a modify operation. The requirement that 'All fields are required (no partial update)' indicates this performs a complete overwrite of firewall configuration state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_firewall_settings Rate-limited

set_firewall_settings 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": {
    "set_firewall_settings": {
      "limits": [
        {
          "counter": "set_firewall_settings_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 Firegex, so you can run agents against it safely.

FAQ

Questions about set_firewall_settings

What does the set_firewall_settings tool do? +

Replace the firewall settings. All fields are required (no partial update). It is categorised as a Write tool in the Firegex MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_firewall_settings? +

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

What risk level is set_firewall_settings? +

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

Can I rate-limit set_firewall_settings? +

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

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

set_firewall_settings is provided by the Firegex MCP server (umbra2728/firegex-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.