Function messageTokenCountFromLastAPIResponse

src/utils/tokens.ts:123–136

(
  messages: Message[],
)

 * in a single response, not how full the context window is.
 */
export function messageTokenCountFromLastAPIResponse(
  messages: Message[],
): number {
  let i = messages.length - 1
  while (i >= 0) {
    const message = messages[i]
    const usage = message ? getTokenUsage(message) : undefined
    if (usage) {
      return usage.output_tokens
    }
    i--
  }
  return 0
}

export function getCurrentUsage(messages: Message[]): {
  input_tokens: number