Why AI-Assisted Coding Should Not Inherit Pair Programming's Lighter Code Review

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On many software teams, code written by two developers together informally receives lighter code review, a trust built on decades of research showing pair programming reduces defects by around 15% and improves design quality. Studies by Cockburn and Williams (2000) and a 2009 meta-analysis confirm pairing offers consistent quality benefits, though with trade-offs in total person-hours. However, one developer argues that AI-assisted coding has not earned the same review discount, noting that AI-generated code frequently introduces security flaws, functional bugs, and erodes developers' understanding of their own systems. The informal 'lighter review' norm for pairs was never universal — it depended on who was pairing and on what — making a blanket extension to human-AI collaboration particularly risky. Until AI tools demonstrate a comparable track record of defect reduction, the author contends that code written with AI agents warrants the same rigorous scrutiny as any solo-authored code.

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