The article highlights the often-overlooked role of the coding harness in AI-assisted development, framing it as the "car" to the model's "engine." This metaphor underscores a critical insight: the effectiveness of AI tools like GitHub Copilot depends as much on the surrounding infrastructure as on the model itself. The harness's responsibilities—context assembly, tool exposure, and execution—reveal how AI integration in development environments is a systems problem, not just a model performance...