# kali_password_john_crack

John the Ripper password cracker supporting many hash formats and attack modes.

Agent View of the PolicyLayer registry record for `kali_password_john_crack`. HTML page: https://policylayer.com/tools/azza39925-kali-mcp-server/kali-password-john-crack

## Facts

- Tool: `kali_password_john_crack`
- Server: Kali MCP Server (`azza39925/kali-mcp-server`) — https://policylayer.com/tools/azza39925-kali-mcp-server.md
- Homepage: https://github.com/azza39925/kali-mcp-server
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "kali_password_john_crack",
    "arguments": {}
  }
}
```

## Why kali_password_john_crack is rated High

This tool executes a password cracking program (John the Ripper) against password hashes. It runs an external security tool that performs computational attacks to recover plaintext passwords. While it doesn't directly delete data or move money, it executes a powerful offensive security operation that could compromise credentials if misused.

From the tool's own definition: "John the Ripper password cracker supporting many hash formats and attack modes"

## Use case

AI agents invoke kali_password_john_crack to trigger actions in Kali MCP Server. 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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Kali MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "kali_password_john_crack": {
      "limits": [
        {
          "counter": "kali_password_john_crack_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Kali MCP Server (18)

- `kali_exploit_msfvenom_generate` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-exploit-msfvenom-generate.md
- `kali_network_masscan_scan` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-network-masscan-scan.md
- `kali_network_netdiscover_scan` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-network-netdiscover-scan.md
- `kali_network_nmap_discover` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-network-nmap-discover.md
- `kali_network_nmap_scan` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-network-nmap-scan.md
- `kali_network_tcpdump_capture` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-network-tcpdump-capture.md
- `kali_network_tshark_capture` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-network-tshark-capture.md
- `kali_password_hashcat_crack` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-password-hashcat-crack.md
- `kali_password_hydra_brute` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-password-hydra-brute.md
- `kali_web_ffuf_fuzz` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-web-ffuf-fuzz.md
- `kali_web_gobuster_dir` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-web-gobuster-dir.md
- `kali_web_gobuster_dns` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-web-gobuster-dns.md
- `kali_web_nikto_scan` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-web-nikto-scan.md
- `kali_web_nuclei_scan` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-web-nuclei-scan.md
- `kali_web_sqlmap_test` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-web-sqlmap-test.md
- `kali_web_wpscan_scan` — Execute — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-web-wpscan-scan.md
- `kali_exploit_searchsploit_examine` — Read — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-exploit-searchsploit-examine.md
- `kali_exploit_searchsploit_search` — Read — https://policylayer.com/tools/azza39925-kali-mcp-server/kali-exploit-searchsploit-search.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=azza39925-kali-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/azza39925-kali-mcp-server