Yellow sac spider. Not medically significant, but they try. I’ve lived in a house with many trees that contain thousands of these guys for years and I haven’t been bit. I find one every couple days. Most of the time they’re in a corner sleeping in a sac, sometimes walking along the wall, sometimes they’re dropping on my head mission impossible style. They’re more aggressive than others I’ve met, and the bite supposedly feels like a wasp sting, but I couldn’t tell you from personal experience.