Suggest Rule

Suggest BPA Rule

Generate a BPA (Best Practice Analyzer) rule based on the description or model the user provided.

Instructions

1. Understand the Request

   • If a description is provided, identify the best practice to enforce
   • If a model path is provided, analyze the model for potential rule opportunities

2. Load Skill Context

   • Read the bpa-rules skill (SKILL.md and its references) for reference documentation
   • Review its references/expression-syntax.md for available properties and patterns
   • Check its examples/comprehensive-rules.json for similar existing rules

3. Generate Rule

   • Determine appropriate Scope based on what objects the rule applies to
   • Write Expression using Dynamic LINQ syntax
   • Consider if a FixExpression is appropriate (only for simple, safe fixes)
   • Assign appropriate Severity (1=info, 2=warning, 3=error)
   • Use standard Category or create descriptive custom category
   • Follow ID naming convention: PREFIX_DESCRIPTIVE_NAME

4. Output Format

Provide the complete rule in JSON format:

{
  "ID": "PREFIX_RULE_NAME",
  "Name": "Human readable rule name",
  "Category": "Category",
  "Description": "Why this rule matters and guidance for fixing",
  "Severity": 2,
  "Scope": "Measure, CalculatedColumn",
  "Expression": "Dynamic LINQ expression",
  "FixExpression": null,
  "CompatibilityLevel": 1200
}

5. Validate
   • Ensure Expression syntax is valid
   • Verify Scope includes all applicable object types
   • Check that rule doesn't duplicate existing standard rules

Examples

User: "Create a rule to check if measures use CALCULATE without filters"

Output:

{
  "ID": "DAX_CALCULATE_NO_FILTERS",
  "Name": "CALCULATE should have filter arguments",
  "Category": "DAX Expressions",
  "Description": "CALCULATE without filter arguments is redundant. Either add filters or remove CALCULATE.",
  "Severity": 1,
  "Scope": "Measure, CalculatedColumn",
  "Expression": "Tokenize().Any(Type = FUNCTION and Text = \"CALCULATE\") and not Tokenize().Any(Type = FUNCTION and Text = \"CALCULATE\" and Next.Type = OPEN_PARENS and Next.Next.Type <> COMMA)",
  "FixExpression": null,
  "CompatibilityLevel": 1200,
  "Remarks": "May have false positives for complex expressions"
}