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.