AI agents call theharvester_osint to retrieve information from Kali Security MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
TheHarvester performs reconnaissance and data gathering from public sources without modifying or destroying any data. It retrieves information through queries to search engines, DNS records, and other public databases. This is a classic Read operation. While OSINT gathering could support malicious activity in a broader attack chain, the tool itself only performs non-destructive queries.
From the tool's definition Tool name 'theharvester_osint' indicates it is TheHarvester, a well-known OSINT (Open Source Intelligence) tool. TheHarvester is primarily used for gathering information such as email addresses, hostnames, subdomains, and other data from public sources.
Documented attack patterns abuse exactly the kind of access theharvester_osint gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kali Security MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for theharvester_osint:
{
"version": "1",
"default": "deny",
"tools": {
"theharvester_osint": {}
}
}theharvester_osint is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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theharvester_osint. It is categorised as a Read tool in the Kali Security MCP MCP Server, which means it retrieves data without modifying state.
Register the Kali Security MCP server in PolicyLayer and add a rule for theharvester_osint: 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 Kali Security MCP. Nothing to install.
theharvester_osint 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 theharvester_osint 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 theharvester_osint. 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.
theharvester_osint is provided by the Kali Security MCP server (seac-25/kali-security-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 249 Kali Security MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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249 Kali Security MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.