callback_latest
A execute tool on the Zebbern Kali MCP server.
This record as markdown: /tools/zebbern-zebbern-kali-mcp/callback-latest.md
What callback_latest does on Zebbern Kali MCP
AI agents invoke callback_latest to trigger actions in Zebbern Kali MCP. 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 callback_latest is rated High
The server context is a full Kali Linux pentest toolkit with tools like secretsdump, bloodhound, kerberoast, etc. The name 'callback_latest' suggests retrieving or triggering a callback (e.g., a reverse shell or C2 callback), which would be an Execute-level action. However, with no description, confidence is low.
From the tool's definition Tool name 'callback_latest' on a Kali Linux penetration testing MCP server; description is empty and uninformative.
Attacks that exploit this kind of access
The rule that runs callback_latest safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Zebbern Kali MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For callback_latest, this is the rule to start with:
callback_latest 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Zebbern Kali MCP, apply this rule, and every callback_latest call is checked against it from then on.
Questions about callback_latest
callback_latest is a execute tool on the Zebbern Kali MCP server. It is categorised as a Execute tool in the Zebbern Kali MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Zebbern Kali MCP server in PolicyLayer and add a rule for callback_latest: 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_latest is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the callback_latest 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_latest. 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_latest 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.
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