Function getTokenCountFromUsage

src/utils/tokens.ts:55–65

(usage: Usage)

 * Use tokenCountWithEstimation() when you need context size from messages.
 */
export function getTokenCountFromUsage(usage: Usage): number {
  if (!usage) {
    return 0
  }
  return (
    (usage.input_tokens ?? 0) +
    (usage.cache_creation_input_tokens ?? 0) +
    (usage.cache_read_input_tokens ?? 0) +
    (usage.output_tokens ?? 0)
  )
}

export function tokenCountFromLastAPIResponse(messages: Message[]): number {
  let i = messages.length - 1