change_password · Firegex MCP: Risk & Policy

WHAT IT DOES

What change_password does on Firegex

AI agents use change_password 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 change_password needs a policy

This tool modifies the authentication password for the Firegex firewall system. It's a Write operation (credential update) rather than Destructive since passwords can be changed again. However, severity is high because an AI agent misusing this tool could lock out legitimate users by setting an unknown password, effectively causing denial of access to the firewall management interface.

From the tool's definition Change the Firegex password

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

change_password Rate-limited

change_password 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": {
    "change_password": {
      "limits": [
        {
          "counter": "change_password_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 change_password

What does the change_password tool do? +

Change the Firegex password (status == 'run' only). 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 change_password? +

Register the Firegex MCP server in PolicyLayer and add a rule for change_password: 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 change_password? +

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

Can I rate-limit change_password? +

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

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

change_password 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.