subfinder_scan
Execute Subfinder for fast subdomain discovery.
This record as markdown: /tools/seac-25-kali-security-mcp/subfinder-scan.md
What subfinder_scan does on Kali Security MCP
AI agents invoke subfinder_scan to trigger actions in Kali Security 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.
Why subfinder_scan is rated High
This tool executes the Subfinder reconnaissance utility, a real external tool that performs active subdomain enumeration against target domains. Running on a Kali Linux penetration testing server, this constitutes execution of an external security tool against potentially unauthorized targets.
From the tool's definition 'Execute Subfinder for fast subdomain discovery' — actively runs the Subfinder tool against external targets
Attacks that exploit this kind of access
The rule that runs subfinder_scan safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Kali Security MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For subfinder_scan, this is the rule to start with:
subfinder_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.
The button opens the PolicyLayer dashboard: create your workspace, connect Kali Security MCP, apply this rule, and every subfinder_scan call is checked against it from then on.
Questions about subfinder_scan
Execute Subfinder for fast subdomain discovery. It is categorised as a Execute tool in the Kali Security MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Kali Security MCP server in PolicyLayer and add a rule for subfinder_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 Kali Security MCP. Nothing to install.
subfinder_scan is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the subfinder_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.
Set action: deny in the PolicyLayer policy for subfinder_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.
subfinder_scan is provided by the Kali Security MCP server (seac-25/kali-security-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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