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WRG-11

wrg-sigma-rules

draft_rule

Draft a Sigma detection YAML rule from a plain-language threat description. Returns a validated YAML body, inferred MITRE technique IDs, and draft notes.

Instructions

Draft a sigma detection YAML rule from a natural-language threat description.

Use when the caller needs a starting-point sigma rule and only has a plain-English threat summary plus optional MITRE TTP hints. Returns a structured envelope with the YAML body, a pySigma round-trip validation result, the inferred MITRE technique IDs, and draft notes covering redactions + open issues. Tool is deterministic and local -- no network, no LLM call.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
descriptionYes
rule_typeNoprocess_creation
referencesNo
target_platformNowindows
severityNomedium
mitre_ttpsNo
titleNo
authorNoWRG sigma-rule-writer

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Discloses key behavioral traits: deterministic, local, no network or LLM call, and describes the return envelope contents. No annotations are provided, so the description carries the transparency burden well.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise and front-loaded with the core purpose. It efficiently communicates usage context and behavior without unnecessary words, though could be slightly more structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the 8 parameters (1 required) and no schema descriptions, the description adequately covers the main input and optional MITRE hints but lacks detail on other parameters. The output schema is mentioned, which adds completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, yet the description only explains the 'description' and 'mitre_ttps' parameters. Other parameters like rule_type, references, target_platform, severity, title, and author are left unspecified, requiring inference from defaults.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool drafts a sigma detection YAML rule from natural language, distinguishing it from sibling tools convert_rule and validate_rule.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states when to use: when a starting-point sigma rule is needed from a plain-English threat summary. Does not mention when not to use or discuss alternatives explicitly, but the context is clear.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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