An AI agent coding skeptic tries AI agent coding, in excessive detail

A software developer who was skeptical about AI coding agents discovered they have become significantly more capable, using them to build increasingly complex projects including a Rust implementation of machine learning algorithms. The developer notes that recent AI coding models (like Opus 4.6 and Codex 5.3) are dramatically better than earlier versions, but this improvement is hard to communicate publicly without sounding like promotional hype.