convert_rule · Wrg Sigma Rules MCP: Risk & Policy

WHAT IT DOES

What convert_rule does on Wrg Sigma Rules

AI agents invoke convert_rule to trigger actions in Wrg Sigma Rules. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why convert_rule needs a policy

Based on the server description, this tool likely performs pySigma-based backend conversion of Sigma rules to formats like Splunk, Elastic, Wazuh, or Kibana queries. Conversion involves executing a transformation pipeline (pySigma library calls) and producing output, which falls under Execute. However, the empty description lowers confidence significantly.

From the tool's definition Tool name 'convert_rule'; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

convert_rule Rate-limited

convert_rule stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "convert_rule": {
      "limits": [
        {
          "counter": "convert_rule_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Wrg Sigma Rules, so you can run agents against it safely.

FAQ

Questions about convert_rule

What does the convert_rule tool do? +

convert_rule. It is categorised as a Execute tool in the Wrg Sigma Rules MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on convert_rule? +

Register the Wrg Sigma Rules MCP server in PolicyLayer and add a rule for convert_rule: 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 Wrg Sigma Rules. Nothing to install.

What risk level is convert_rule? +

convert_rule is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit convert_rule? +

Yes. Add a rate_limit block to the convert_rule 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.

How do I block convert_rule completely? +

Set action: deny in the PolicyLayer policy for convert_rule. 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.

What MCP server provides convert_rule? +

convert_rule is provided by the Wrg Sigma Rules MCP server (wrg-11/wrg-sigma-rules). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.