update_nfproxy_service_settings · Firegex MCP: Risk & Policy

WHAT IT DOES

What update_nfproxy_service_settings does on Firegex

AI agents use update_nfproxy_service_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 update_nfproxy_service_settings needs a policy

The tool modifies configuration of an existing service and triggers a restart, which is a reversible write/update operation. The restart side-effect elevates severity slightly but does not make it destructive since data is not deleted or irreversibly lost. The service disruption from restart is temporary.

From the tool's definition "Change settings of an existing nfproxy service (causes restart)"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_nfproxy_service_settings Rate-limited

update_nfproxy_service_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": {
    "update_nfproxy_service_settings": {
      "limits": [
        {
          "counter": "update_nfproxy_service_settings_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 update_nfproxy_service_settings

What does the update_nfproxy_service_settings tool do? +

Change settings of an existing nfproxy service (causes restart). 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 update_nfproxy_service_settings? +

Register the Firegex MCP server in PolicyLayer and add a rule for update_nfproxy_service_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 update_nfproxy_service_settings? +

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

Can I rate-limit update_nfproxy_service_settings? +

Yes. Add a rate_limit block to the update_nfproxy_service_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 update_nfproxy_service_settings completely? +

Set action: deny in the PolicyLayer policy for update_nfproxy_service_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 update_nfproxy_service_settings? +

update_nfproxy_service_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.