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.