Is it something I'll want to keep or trash?

Looks like velvet leaf senna (Senna lindheimeriana). It's a keeper. I have it and it blooms until frost and dies back in winter here in 8b but comes back from seed.

How tall is this if it is tall, it might be a rattlebush or Sesbania drummondii. that it could be. If it is , I would pull it out.

It's about 30 inches maybe. It was from seeds that I winter sowed several years ago and then transplanted to a sunny dry area of the yard. It would come up in spring and get maybe a foot tall and then die back.

I think maybe it's Wild Senna (Cassia hebecarpa).