Documentation/config/worktree.txt

   1 worktree.guessRemote::
   2         If no branch is specified and neither `-b` nor `-B` nor
   3         `--detach` is used, then `git worktree add` defaults to
   4         creating a new branch from HEAD.  If `worktree.guessRemote` is
   5         set to true, `worktree add` tries to find a remote-tracking
   6         branch whose name uniquely matches the new branch name.  If
   7         such a branch exists, it is checked out and set as "upstream"
   8         for the new branch.  If no such match can be found, it falls
   9         back to creating a new branch from the current HEAD.