Just today I installed the CLI version of antigravity (agy) and have been using it as a headless subagent from within Claude, so uh this works today?
The solutions proposed by Gemini and Google's AI summaries all hallucinate agy subcommands that don't exist, hilariously.
Edit: after bouncing around several GitHub threads, I realized that the agy TUI framework is wrapping the URL in a way that causes spaces to be inserted where the URL wraps. That's hilarious.
You're right, I just re-tested on my server and was able to get it to work now. Thank you! Does appear to just be stale documentation.