cewl_generate · Kali MCP: Risk & Policy

WHAT IT DOES

What cewl_generate does on Kali

AI agents invoke cewl_generate 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 cewl_generate needs a policy

CeWL (Custom Word List generator) crawls a target URL and generates wordlists used in password cracking/brute-force attacks. This constitutes an active external operation (web spidering of a target) and produces artifacts used for offensive security purposes. The description is empty, lowering confidence slightly, but the tool name and server context strongly imply this function.

From the tool's definition Tool name 'cewl_generate' on a Kali Linux penetration testing MCP server supporting 'password attacks' among 90+ tools. CeWL is a well-known Kali Linux tool that spiders a target website to generate custom wordlists for password attacks.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cewl_generate Rate-limited

cewl_generate 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": {
    "cewl_generate": {
      "limits": [
        {
          "counter": "cewl_generate_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 cewl_generate

What does the cewl_generate tool do? +

cewl_generate. 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 cewl_generate? +

Register the Kali MCP server in PolicyLayer and add a rule for cewl_generate: 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 cewl_generate? +

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

Can I rate-limit cewl_generate? +

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

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

cewl_generate is provided by the Kali MCP server (pentestt00ls/kali-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.