AI agents call search_yara_rules 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 retrieves or queries YARA rules from a threat intelligence database. While YARA rules are used in cybersecurity contexts, searching for rules is a read-only operation with no side effects on systems or data. The tool does not execute the rules, deploy them, modify them, or delete them—it simply retrieves information.
From the tool's definition search_yara_rules - the verb 'search' indicates querying/retrieval of YARA detection rules without modification, deletion, or execution of those rules against systems.
Documented attack patterns abuse exactly the kind of access search_yara_rules 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 search_yara_rules:
{
"version": "1",
"default": "deny",
"tools": {
"search_yara_rules": {}
}
}search_yara_rules is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Name: search_yara_rules. 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 search_yara_rules: 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.
search_yara_rules 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 search_yara_rules 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 search_yara_rules. 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.
search_yara_rules 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.