AI agents call ctf_list_challenges to retrieve information from Zebbern Kali MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves a list of available CTF challenges, which is a non-destructive read operation. Despite the server providing access to penetration testing tools (some of which are clearly Execute/Destructive like ad_psexec, ad_secretsdump, ad_wmiexec), this specific tool merely enumerates existing challenges without side effects.
From the tool's definition Tool name 'ctf_list_challenges' and description 'List all available CTF challenges' indicate a read-only query operation that retrieves information without modifying or executing anything.
Documented attack patterns abuse exactly the kind of access ctf_list_challenges gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Zebbern Kali MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for ctf_list_challenges:
{
"version": "1",
"default": "deny",
"tools": {
"ctf_list_challenges": {}
}
}ctf_list_challenges is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available CTF challenges. It is categorised as a Read tool in the Zebbern Kali MCP MCP Server, which means it retrieves data without modifying state.
Register the Zebbern Kali MCP server in PolicyLayer and add a rule for ctf_list_challenges: 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 Zebbern Kali MCP. Nothing to install.
ctf_list_challenges is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the ctf_list_challenges 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 ctf_list_challenges. 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.
ctf_list_challenges is provided by the Zebbern Kali MCP server (zebbern/zebbern-kali-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 128 Zebbern Kali MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
128 Zebbern Kali MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.