{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema_version", "rules_version", "rules"],
  "properties": {
    "schema_version": {"const": 1},
    "rules_version": {"type": "string", "minLength": 1, "maxLength": 128},
    "rules": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["rule_id", "reason_code", "severity", "scope", "action", "pattern", "positive", "negative"],
        "properties": {
          "rule_id": {"type": "string", "pattern": "^[a-z][a-z0-9_.-]+$"},
          "reason_code": {"enum": ["message_blocked", "monitor"]},
          "severity": {"enum": ["low", "medium", "high", "critical"]},
          "scope": {"enum": ["text", "url", "file_metadata"]},
          "action": {"enum": ["deny", "monitor"]},
          "pattern": {"type": "string", "minLength": 1, "maxLength": 1000},
          "positive": {"type": "array", "minItems": 1, "items": {"type": "string"}},
          "negative": {"type": "array", "minItems": 1, "items": {"type": "string"}}
        }
      }
    }
  }
}