AI agents call group_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 and organizes YARA rule data for analysis purposes. It performs classification/grouping of existing signature data without executing code, modifying systems, deleting data, or committing financial transactions. The action is read-like (retrieving and organizing data for threat intelligence), placing it in the Read category.
From the tool's definition The tool name is 'group_yara_rules' with description indicating it organizes/groups YARA rules (malware detection signatures). YARA rules are data artifacts used for analysis and detection patterns, not operational executables.
Documented attack patterns abuse exactly the kind of access group_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 group_yara_rules:
{
"version": "1",
"default": "deny",
"tools": {
"group_yara_rules": {}
}
}group_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: group_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 group_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.
group_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 group_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 group_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.
group_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.