Thanks, sharing my learnings on how coding agents work was my main intention with the article. Personally I was a bit surprised by how much of the "magic" is coming directly from the underlying LLM.

The shell command can run anything really. When I tested it, it asked me multiple times to run the tests and then I could see it fixing the tests in iterations. Very interesting to observe.

If I was to improve this to be a better Ruby agent (which I don't plan to do, at least not yet), I would probably try adding some Rspec/Minitest specific tools that would parse the response and present it back to the LLM in a cleaned up format.