hydra_bruteforce · Kali MCP: Risk & Policy

WHAT IT DOES

What hydra_bruteforce does on Kali

AI agents invoke hydra_bruteforce to trigger actions in Kali. 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 IT NEEDS A POLICY

Why hydra_bruteforce needs a policy

Hydra performs active offensive operations against external systems by attempting to gain unauthorized access via brute-force or dictionary attacks. This is an Execute-category action with critical severity: an AI agent misusing this tool could launch illegal attacks against arbitrary targets (SSH, FTP, HTTP servers), cause account lockouts, violate computer fraud laws, and compromise remote systems.

From the tool's definition 'Use Hydra for password brute forcing (SSH, FTP, HTTP, etc.)' — Hydra is an active credential-stuffing/brute-force attack tool that executes repeated authentication attempts against remote services

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

hydra_bruteforce Rate-limited

hydra_bruteforce 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": {
    "hydra_bruteforce": {
      "limits": [
        {
          "counter": "hydra_bruteforce_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Kali, so you can run agents against it safely.

FAQ

Questions about hydra_bruteforce

What does the hydra_bruteforce tool do? +

Use Hydra for password brute forcing (SSH, FTP, HTTP, etc.). It is categorised as a Execute tool in the Kali MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on hydra_bruteforce? +

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

What risk level is hydra_bruteforce? +

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

Can I rate-limit hydra_bruteforce? +

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

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

hydra_bruteforce is provided by the Kali MCP server (rangta10/kali-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.