AI agents call callback_list 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.
Although the description is empty, the name and surrounding context (Kali Linux penetration testing toolkit) indicate this tool retrieves callback information rather than executing commands or modifying state. However, confidence is reduced due to lack of explicit documentation.
From the tool's definition Tool name 'callback_list' combined with sibling tools that are offensive security utilities (asreproast, kerberoast, ldap_enum, password_spray, psexec, secretsdump, smb_enum, wmiexec) suggests this queries or enumerates callback infrastructure, likely…
Documented attack patterns abuse exactly the kind of access callback_list 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 callback_list:
{
"version": "1",
"default": "deny",
"tools": {
"callback_list": {}
}
}callback_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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callback_list. 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 callback_list: 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.
callback_list 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 callback_list 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 callback_list. 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.
callback_list 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.
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128 Zebbern Kali MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.