cleanRawForHistory static method

String cleanRawForHistory(
  1. String rawJson
)

Clean a raw SDK response JSON string by recursively stripping <|"|> escape tokens. Used by chat.dart before writing the assistant turn into chat history — without this the next request echoes the escape tokens back to the model and Gemma 4 starts reproducing them in subsequent tool_calls arguments (#248).

Returns the cleaned JSON string, or the input unchanged if it isn't valid JSON (the caller falls back to writing the raw string in that case).

Implementation

static String cleanRawForHistory(String rawJson) {
  try {
    final decoded = jsonDecode(rawJson);
    return jsonEncode(_stripEscapeTokens(decoded));
  } on FormatException {
    return rawJson;
  }
}