{
  "name": "Vacuum Ruleset",
  "description": "Structure of a Vacuum/Spectral-compatible linting ruleset",
  "fields": [
    { "name": "extends", "type": "string|array", "required": false, "description": "Extend built-in or external rulesets" },
    { "name": "rules", "type": "object", "required": false, "description": "Custom rule definitions keyed by rule name" },
    { "name": "formats", "type": "array", "required": false, "description": "Supported specification formats" }
  ],
  "nested": {
    "rules[*]": [
      { "name": "description", "type": "string", "required": true, "description": "Human-readable rule description" },
      { "name": "message", "type": "string", "required": false, "description": "Message shown when rule fails" },
      { "name": "severity", "type": "enum[error,warn,info,hint,off]", "required": false, "description": "Rule severity level" },
      { "name": "given", "type": "string|array", "required": true, "description": "JSONPath expression to target" },
      { "name": "then", "type": "object|array", "required": true, "description": "Function(s) to apply" }
    ]
  }
}