Running kiln

kiln takes a folder to open as its argument, resolved against your shell's working directory:

kiln .            # open the repo you're standing in
kiln ../sibling   # open a neighbour
kiln ~/code/proj  # an absolute path

With no argument it restores the last session.

You can also launch kiln like any other Mac app, from Spotlight, Launchpad, or the Dock, then open a folder from inside. The kiln command is there for when you're already in a terminal and want to open the folder you're standing in.