Calculate file hash and look up on VirusTotal.
AI agents call vt_lookup_file to retrieve information from Windows Forensics MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs two read-only operations: (1) computing a file hash locally (deterministic, no side effects), and (2) querying VirusTotal's public API to retrieve threat intelligence metadata. No data is created, modified, deleted, or executed. The tool retrieves forensic intelligence to support analysis decisions but does not alter any system state.
From the tool's definition Tool name 'vt_lookup_file' and description 'Calculate file hash and look up on VirusTotal' indicate read-only operations: hashing a local file and querying an external threat intelligence service for detection data.
Documented attack patterns abuse exactly the kind of access vt_lookup_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Windows Forensics MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for vt_lookup_file:
{
"version": "1",
"default": "deny",
"tools": {
"vt_lookup_file": {}
}
}vt_lookup_file is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Calculate file hash and look up on VirusTotal. It is categorised as a Read tool in the Windows Forensics MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Windows Forensics MCP Server MCP server in PolicyLayer and add a rule for vt_lookup_file: 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 Windows Forensics MCP Server. Nothing to install.
vt_lookup_file 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 vt_lookup_file 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 vt_lookup_file. 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.
vt_lookup_file is provided by the Windows Forensics MCP Server MCP server (x746b/winforensics-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Windows Forensics MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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61 Windows Forensics MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.