UsageMetadata
constructor(promptTokenCount: Int? = null, cachedContentTokenCount: Int? = null, candidatesTokenCount: Int? = null, toolUsePromptTokenCount: Int? = null, thoughtsTokenCount: Int? = null, totalTokenCount: Int? = null, promptTokensDetails: List<ModalityTokenCount>? = null, cacheTokensDetails: List<ModalityTokenCount>? = null, candidatesTokensDetails: List<ModalityTokenCount>? = null, toolUsePromptTokensDetails: List<ModalityTokenCount>? = null)(source)