Simon Willison 12/18/2025

Your job is to deliver code you have proven to work

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The article critiques developers who use AI tools to generate large, untested code and expect code reviews to catch issues. It emphasizes that a developer's core duty is to deliver proven, working code. The author details a two-step mandatory process: first, manual testing and demonstrating the change, and second, writing automated tests. It concludes by discussing the role of modern AI coding agents in this proof-of-work process.

Your job is to deliver code you have proven to work

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