Function getDateChangeAttachments

source code/utils/attachments.ts:1417–1446

(
  messages: Message[] | undefined,
)

 * Exported for testing — regression guard for the cache-clear removal.
 */
export function getDateChangeAttachments(
  messages: Message[] | undefined,
): Attachment[] {
  const currentDate = getLocalISODate()
  const lastDate = getLastEmittedDate()

  if (lastDate === null) {
    // First turn — just record, no attachment needed
    setLastEmittedDate(currentDate)
    return []
  }

  if (currentDate === lastDate) {
    return []
  }

  setLastEmittedDate(currentDate)

  // Assistant mode: flush yesterday's transcript to the per-day file so
  // the /dream skill (1–5am local) finds it even if no compaction fires
  // today. Fire-and-forget; writeSessionTranscriptSegment buckets by
  // message timestamp so a multi-day gap flushes each day correctly.
  if (feature('KAIROS')) {
    if (getKairosActive() && messages !== undefined) {
      sessionTranscriptModule?.flushOnDateChange(messages, currentDate)
    }
  }

  return [{ type: 'date_change', newDate: currentDate }]
}

function getUltrathinkEffortAttachment(input: string | null): Attachment[] {
  if (!isUltrathinkEnabled() || !input || !hasUltrathinkKeyword(input)) {