Function getLastSessionLog

source code/utils/sessionStorage.ts:3871–3934

(
  sessionId: UUID,
)

}

export async function getLastSessionLog(
  sessionId: UUID,
): Promise<LogOption | null> {
  // Single read: load all session data at once instead of reading the file twice
  const {
    messages,
    summaries,
    customTitles,
    tags,
    agentSettings,
    worktreeStates,
    fileHistorySnapshots,
    attributionSnapshots,
    contentReplacements,
    contextCollapseCommits,
    contextCollapseSnapshot,
  } = await loadSessionFile(sessionId)
  if (messages.size === 0) return null
  // Prime getSessionMessages cache so recordTranscript (called after REPL
  // mount on --resume) skips a second full file load. -170~227ms on large sessions.
  // Guard: only prime if cache is empty. Mid-session callers (e.g. IssueFeedback)
  // may call getLastSessionLog on the current session — overwriting a live cache
  // with a stale disk snapshot would lose unflushed UUIDs and break dedup.
  if (!getSessionMessages.cache.has(sessionId)) {
    getSessionMessages.cache.set(
      sessionId,
      Promise.resolve(new Set(messages.keys())),
    )
  }

  // Find the most recent non-sidechain message
  const lastMessage = findLatestMessage(messages.values(), m => !m.isSidechain)
  if (!lastMessage) return null

  // Build the transcript chain from the last message
  const transcript = buildConversationChain(messages, lastMessage)

  const summary = summaries.get(lastMessage.uuid)
  const customTitle = customTitles.get(lastMessage.sessionId as UUID)
  const tag = tags.get(lastMessage.sessionId as UUID)
  const agentSetting = agentSettings.get(sessionId)
  return {
    ...convertToLogOption(
      transcript,
      0,
      summary,
      customTitle,
      buildFileHistorySnapshotChain(fileHistorySnapshots, transcript),
      tag,
      getTranscriptPathForSession(sessionId),
      buildAttributionSnapshotChain(attributionSnapshots, transcript),
      agentSetting,
      contentReplacements.get(sessionId) ?? [],
    ),
    worktreeSession: worktreeStates.get(sessionId),
    contextCollapseCommits: contextCollapseCommits.filter(
      e => e.sessionId === sessionId,
    ),