Yup, this is one of the many reasons why I prefer OpenCode as my agentic harness of choice. If I'm confused about something I can just read the source code.

I found it really eye opening to understand the flow of how the harness instructs the model and then consumes the crafted JSON response that comes back so you can better understand the split and where a fix may need to go; such as better harness logic, different prompt or perhaps another model.