The concept of "Write-Only Code" emerges from the changing dynamics of enterprise software development, particularly influenced by advancements in AI. The author argues that a significant portion of production code will soon be generated by AI without any human review. While AI-assisted programming currently requires human oversight, the rapid evolution of AI capabilities threatens to eliminate this bottleneck. As AI can now handle complex software tasks autonomously, the need for human review may diminish, leading to a future where much of the code remains unread by developers. The shift from human-written code to AI-generated code mirrors historical changes in software development, such as the transition from hardware bottlenecks to a focus on developer velocity. This evolution challenges long-standing practices like code reviews, which traditionally serve as a safety net against errors. The article suggests that teams will need to develop new methods for building trust in unread code, potentially through metrics like "code reading coverage." As organizations adapt, they will selectively implement Write-Only Code practices, carefully balancing automation and human oversight based on the criticality of the software involved. The author emphasizes the ongoing role of software engineers as risk managers, even as their tasks shift dramatically. They must navigate business goals and technical constraints while ensuring that the generated code meets necessary standards. Understanding the implications of Write-Only Code will require a rethinking of engineering culture, processes, and tools, as the industry moves toward this new reality.