run_subfinder

A execute tool on the Pentester- MCP server.

SERVERPentester-MCP SOURCEhalilkirazkaya/pentester-mcp

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/halilkirazkaya-pentester-mcp/run-subfinder.md

WHAT IT DOES

What run_subfinder does on Pentester-MCP

AI agents invoke run_subfinder to trigger actions in Pentester-MCP. 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 run_subfinder is rated High

Subfinder triggers external reconnaissance operations (DNS queries, API calls to passive sources) whose results and side effects depend on the target argument. This is Execute rather than Read because it autonomously performs active or semi-active reconnaissance operations against specified targets.

From the tool's definition Tool name 'run_subfinder' combined with server context describing 'reconnaissance' and 'penetration testing tools.' Subfinder is an open-source reconnaissance tool that enumerates subdomains by querying multiple public APIs and passive data sources.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs run_subfinder safely

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

run_subfinder Rate-limited

run_subfinder 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": {
    "run_subfinder": {
      "limits": [
        {
          "counter": "run_subfinder_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 Pentester-MCP, apply this rule, and every run_subfinder call is checked against it from then on.

FAQ

Questions about run_subfinder

What does the run_subfinder tool do? +

run_subfinder is a execute tool on the Pentester MCP server. It is categorised as a Execute tool in the Pentester-MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on run_subfinder? +

Register the Pentester MCP server in PolicyLayer and add a rule for run_subfinder: 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 Pentester-MCP. Nothing to install.

What risk level is run_subfinder? +

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

Can I rate-limit run_subfinder? +

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

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

run_subfinder is provided by the Pentester MCP server (halilkirazkaya/pentester-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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