I thought it was a bluebird, but indeed it's a tree swallow. Then I thought it was taking over the house, but in sorting the images, it's clear it's just a hunting position -- sort of a deer-stand but for insects...an insect stand! It left not long after these images.
eastern phoebe or eastern wood peewee? Did not notice a lot of tail wagging. Two were feeding on hobomok skippers.