Working with AI Agents isn’t just about choosing the right tool—it’s about learning how to guide it. This post explores prompt refinement, system instructions, and iterative techniques that can help developers get better results from AI.

I continue my vibe coding journey by refining the infrastructure of a simple React app. I cover setting up Yarn, adding CSS Modules, improving date formatting, introducing i18n, and writing Copilot instructions. Most changes were guided by AI, with some manual adjustments along the way.

A hands-on look at building a simple React form using GPT-4.1 Agent Mode with minimal manual changes. I share how the Agent handled common development tasks, small UX improvements, and where close supervision was still needed.