The Harness Is the Thing
The author reflects on the rapid evolution of AI-assisted software development, moving from simple tab completion to complex agentic workflows. They argue that the 'harness'—the framework and methodology used to manage LLMs—is now more important than the specific model being used.
Why it matters
It highlights a shift in the software industry where developer productivity is becoming decoupled from specific proprietary AI models, favoring modular, model-agnostic workflows.
When I started out as a developer, I had a graybeard observe for me that Moore's law also applies to software. I didn't understand that this constant conversation about how we were solving problems was the arc of progress; that complaining about J2EE and how slow Netbeans was, and wheezing about table-based layouts and constant full-page reloads, was the day-to-day optimizing that is also an engine of progress.
The last eighteen months have been a particular window of relentless improvement. Tab completions have given way to agentic coding which has given way to managing your agents with a harness. I've gone from being awed at the productivity gains to settling into the game and squeezing the lemon to see what I can get.
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