AI agents call pivot_list_tunnels 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 and displays information about active tunnels and port forwards—a non-destructive, non-modifying operation. While it provides reconnaissance data in a penetration testing context (and the parent server exposes significant attack capabilities like psexec, kerberoast, and secretsdump), the tool itself only reads state.
From the tool's definition Tool name 'pivot_list_tunnels' and description 'List all active tunnels and port forwards' indicate a read-only query operation that retrieves information about existing network tunnels without modifying or executing any operations.
Documented attack patterns abuse exactly the kind of access pivot_list_tunnels 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 pivot_list_tunnels:
{
"version": "1",
"default": "deny",
"tools": {
"pivot_list_tunnels": {}
}
}pivot_list_tunnels 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 active tunnels and port forwards. 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 pivot_list_tunnels: 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.
pivot_list_tunnels 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 pivot_list_tunnels 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 pivot_list_tunnels. 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.
pivot_list_tunnels 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.