Function call

src/commands/branch/branch.ts:222–296

(
  onDone: LocalJSXCommandOnDone,
  context: LocalJSXCommandContext,
  args: string,
)

}

export async function call(
  onDone: LocalJSXCommandOnDone,
  context: LocalJSXCommandContext,
  args: string,
): Promise<React.ReactNode> {
  const customTitle = args?.trim() || undefined

  const originalSessionId = getSessionId()

  try {
    const {
      sessionId,
      title,
      forkPath,
      serializedMessages,
      contentReplacementRecords,
    } = await createFork(customTitle)

    // Build LogOption for resume
    const now = new Date()
    const firstPrompt = deriveFirstPrompt(
      serializedMessages.find(m => m.type === 'user'),
    )

    // Save custom title - use provided title or firstPrompt as default
    // This ensures /status and /resume show the same session name
    // Always add " (Branch)" suffix to make it clear this is a branched session
    // Handle collisions by adding a number suffix (e.g., " (Branch 2)", " (Branch 3)")
    const baseName = title ?? firstPrompt
    const effectiveTitle = await getUniqueForkName(baseName)
    await saveCustomTitle(sessionId, effectiveTitle, forkPath)

    logEvent('tengu_conversation_forked', {
      message_count: serializedMessages.length,
      has_custom_title: !!title,
    })

    const forkLog: LogOption = {
      date: now.toISOString().split('T')[0]!,
      messages: serializedMessages,
      fullPath: forkPath,
      value: now.getTime(),
      created: now,
      modified: now,
      firstPrompt,
      messageCount: serializedMessages.length,
      isSidechain: false,
      sessionId,
      customTitle: effectiveTitle,
      contentReplacements: contentReplacementRecords,
    }

    // Resume into the fork
    const titleInfo = title ? ` "${title}"` : ''
    const resumeHint = `\nTo resume the original: claude -r ${originalSessionId}`
    const successMessage = `Branched conversation${titleInfo}. You are now in the branch.${resumeHint}`

    if (context.resume) {