What Changed When the Same Kata Needed a UI
The next question needed a visible result I began this exploration in From an Empty Repository to a Java Kata, One Module at a Time , following one Codex run from an almost empty repository to a Java project and a String Calculator implementation. Seed4J CLI gave the agent modules it could inspect and combine into the project foundation. I then compared six Codex runs . Their paths through the…
When the same game Kata needed a user interface, the results varied among three different implementations using the same coding agent. All three models satisfied the shared functional requirements, but the path taken and the outcomes differed significantly.
Luna composed a Java application with Spring Boot and Thymeleaf, resulting in a layout and flow distinct from the other two implementations. Terra and Sol both chose TypeScript, React, and Vite, yet they produced different user interface designs and behaviors.
Despite the visual differences, the shared behavior was the baseline for all three implementations. The Seed4J CLI provided a common way for the agents to discover, validate, and apply various module combinations while working towards the same functional target. This experiment demonstrated that even with a single, focused prompt, the agent could effectively navigate the Seed4J ecosystem to produce diverse, functional products.
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