Function isInsideTmux

src/utils/swarm/backends/detection.ts:50–60

()

 * on the system, not just if THIS process is inside tmux.
 */
export async function isInsideTmux(): Promise<boolean> {
  if (isInsideTmuxCached !== null) {
    return isInsideTmuxCached
  }

  // Check the original TMUX env var (captured at module load)
  // This tells us if the user started Claude from within their tmux session
  // If TMUX is not set, we are NOT inside tmux - period.
  isInsideTmuxCached = !!ORIGINAL_USER_TMUX
  return isInsideTmuxCached
}

/**
 * Gets the leader's tmux pane ID captured at module load.