AI agents call get_yara_for_family to retrieve information from SeldomMaster without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves YARA rule signatures linked to a known malware family. It performs a read-only lookup operation with no side effects on external systems or data – it merely fetches static threat intelligence data. The blast radius of misuse is minimal; returning YARA rules does not modify systems, execute code, or cause destructive changes. It falls clearly into the Read category.
From the tool's definition The tool name is 'get_yara_for_family' which uses 'get' – a retrieval operation. It retrieves YARA rules associated with a malware family from threat intelligence resources (likely Malpedia, as indicated by the sibling tools on this cybersecurity server).
Documented attack patterns abuse exactly the kind of access get_yara_for_family gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SeldomMaster, and nothing reaches the server without passing your rules. This is the rule we recommend for get_yara_for_family:
{
"version": "1",
"default": "deny",
"tools": {
"get_yara_for_family": {}
}
}get_yara_for_family is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Name: get_yara_for_family. It is categorised as a Read tool in the SeldomMaster MCP Server, which means it retrieves data without modifying state.
Register the SeldomMaster MCP server in PolicyLayer and add a rule for get_yara_for_family: 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 SeldomMaster. Nothing to install.
get_yara_for_family 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 get_yara_for_family 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 get_yara_for_family. 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.
get_yara_for_family is provided by the SeldomMaster MCP server (paralax/seldommonster). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SeldomMaster, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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52 SeldomMaster tools catalogued and risk-classified — across an index of 43,000+ MCP servers.