tools_crtsh
A read tool on the Zebbern Kali MCP server.
This record as markdown: /tools/zebbern-zebbern-kali-mcp/tools-crtsh.md
What tools_crtsh does on Zebbern Kali MCP
AI agents call tools_crtsh to retrieve information from Zebbern Kali MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why tools_crtsh is rated Low
The crt.sh tool is used for reconnaissance—searching Certificate Transparency logs to enumerate domains and subdomains associated with target organizations. This is a read-only operation with no side effects on systems.
From the tool's definition Tool name 'tools_crtsh' refers to crt.sh, a public Certificate Transparency log search utility. Despite empty description, the naming and context within a penetration testing toolkit indicate it queries certificate logs rather than modifying or executing…
Attacks that exploit this kind of access
The rule that runs tools_crtsh 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 tools_crtsh, this is the rule to start with:
tools_crtsh is read-only, so it stays allowed. 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 tools_crtsh call is checked against it from then on.
Questions about tools_crtsh
tools_crtsh is a read tool on the Zebbern Kali MCP server. 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 tools_crtsh: 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.
tools_crtsh 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 tools_crtsh 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 tools_crtsh. 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.
tools_crtsh 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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