My experience with Antigravity is that it will tell me it's completed a task or implementation that it hasn't. Like, the work is half-mostly done but not.
You'll need a subscription ($20 tier should be fine) and then need to add "connectors" to your services (Gmail, 365, etc) so that it can access them. Then you just use the Claude Cowork (Or ChatGPT equivalent) tabs and chat with it.
It might be hidden somewhere or they’re doing A/B testing. Cowork was part of the left sidebar for Claude but when I was looking for it, it was gone. I had to do a search query to find it.