AI Answers Can Come with Silent Tech Debt

AI answers solve the task by making decisions automatically for you. This is convenient. It’s what makes the vibe coding quickstart feel so magical. But it comes with the burden: implicit choices. I see this often enough that I need to write it down. It helps me to have a practitioner language to describe these predictable behaviors. The model makes choices for you. I call that default fill-in. I worked with Claude 4.6 to design a trivial experiment that demonstrates this. The Prompt I need to build a js file picker and color picker too. It’s react and we are using our Python teams api. I have the url if you can make that a variable for me to change. React only. I use incognito mode to limit carryover from my own Claude usage. I give the same prompt in two sessions. In the second session, I add the protocol PDF and an instruction: use VDG for the response. What the Model Chose Here’s what the vanilla response chose on its own: multi-file upload drag and drop preset colors an ${API_URL}