set_password · Firegex MCP: Risk & Policy

WHAT IT DOES

What set_password does on Firegex

AI agents use set_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 set_password needs a policy

This tool modifies system state (the initial password for Firegex) but is reversible (password can be changed again via change_password). It is not destructive, financial, or executable code. While high-severity due to authentication implications, it remains a Write operation.

From the tool's definition Tool sets a password ('Set the initial Firegex password'), a security-critical configuration state change that modifies authentication credentials.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_password Rate-limited

set_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": {
    "set_password": {
      "limits": [
        {
          "counter": "set_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 set_password

What does the set_password tool do? +

Set the initial Firegex password. Only valid while status == 'init'. 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_password? +

Register the Firegex MCP server in PolicyLayer and add a rule for set_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 set_password? +

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

Can I rate-limit set_password? +

Yes. Add a rate_limit block to the set_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 set_password completely? +

Set action: deny in the PolicyLayer policy for set_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 set_password? +

set_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.