fierce_scan

Execute fierce for DNS reconnaissance with enhanced logging.

SERVERNyxstrike SOURCECommonHuman-Lab/nyxstrike

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/nyxstrike/fierce-scan.md

WHAT IT DOES

What fierce_scan does on Nyxstrike

AI agents invoke fierce_scan to trigger actions in Nyxstrike. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why fierce_scan is rated High

This tool executes the fierce DNS reconnaissance utility, an active scanning tool that probes external DNS infrastructure. It is part of an offensive security/penetration testing platform, meaning it could be used to enumerate subdomains and DNS records of arbitrary targets. The 'Execute' category applies because it triggers an external tool with effects dependent on the target argument.

From the tool's definition 'Execute fierce for DNS reconnaissance with enhanced logging' — runs the external fierce tool to perform active DNS reconnaissance against targets

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs fierce_scan safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Nyxstrike, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For fierce_scan, this is the rule to start with:

fierce_scan Rate-limited

fierce_scan stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "fierce_scan": {
      "limits": [
        {
          "counter": "fierce_scan_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Nyxstrike, apply this rule, and every fierce_scan call is checked against it from then on.

FAQ

Questions about fierce_scan

What does the fierce_scan tool do? +

Execute fierce for DNS reconnaissance with enhanced logging. It is categorised as a Execute tool in the Nyxstrike MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on fierce_scan? +

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

What risk level is fierce_scan? +

fierce_scan is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit fierce_scan? +

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

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

fierce_scan is provided by the Nyxstrike MCP server (CommonHuman-Lab/nyxstrike). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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