Here is a JavaScript regex that makes sure a response is zero or more exclusively hiragana and katakana characters: 
````javascript
^([ァ-ヺ]|[ぁ-ゖ])*$
```` 
Note that this regex does not cover all symbols in the hirigana and Katakana unicode blocks, as some of those symbols are not kana.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence