Kent Beck

Kent Beck spent roughly 110 to 130 hours over four weeks on a B+ Tree library in Rust and Python, abandoning the first two versions as complexity accumulated, then published the result in June 2025 as "Augmented Coding: Beyond the Vibes". The distinction he set out there now anchors a wider argument: augmented coding holds code quality, complexity and test coverage as priorities, while vibe coding attends only to system behaviour.

He created Test-Driven Development, and the case he makes for it in the AI era rests on amplification: disciplined engineers run red-green-refactor faster with a model, undisciplined ones produce buggy code faster. His October 2024 LinkedIn post graded that by context, accepting vibe coding for throwaway prototypes and refusing it for production code, and settled on hybrid approaches. His BPlusTree3 system prompt enforced the simplest failing test first and never mixed structural with behavioural changes in one commit.

Working with his "genies" all day also feeds his economic reading. In "Starving Genies" (April 2026) he treats the near-simultaneous usage limits from Google, Amazon and Anthropic as a signal to investors rather than an unforeseen technical wall, and asks whether intensive AI use is becoming a premium product instead of a default service.

Others reach for his formulations: Julien Lépine quotes « 99 % de ma valeur est devenue inutile, mais le 1 % restant a fait ×1000 », Dorra Bartaguiz his line that teams who know how to test will adapt better. Beck's own verdict on BPlusTree3 was less settled: good about correctness and performance, not about code quality.