Claude history merges, never overwriting, into a project directory a deleted case of the new name left behind, instead of staying orphaned under the old key.
The free-target pre-check also refuses a dangling symlink (lstat), so stopSessions no longer ends sessions before a 409 EXISTS.
The rename dialog says stopped sessions are closed (their tabs go away) and, after a failed rename, how many were already closed.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>