I am building an Agent IDE called Harness. It is somewhat inspired by the previous version of antigravity (and Conductor, and a few others). But with a core goal being open source & hackability.

It's centered around git worktrees. The goal is to organize all your AI sessions into somewhat logical places and make it easy to context switch. The secondary goal is to remove the need to open a separate code editor anytime you want to look at a file (We have a built in file editor powered by Monaco [vscodes editor])

Check it out https://harness.mikelyons.org