Thanks for those kind words. The landing page's demo required lots of sculpting.
I would say that agent-qa is not only frontend focused. As you can run hooks in sandboxed env to test apis, so a better way to put it is with agent-qa you can test the product end-to-end not only UI.
But the issue with API testing / backend is that coding harnesses are really good at it. A product manager who writes user stories should be able to write tests for the product, and usually PMs don't care about the APIs.
Do give agent-qa a try, and consider giving it a star on GH https://github.com/vostride/agent-qa
Thanks!