Vibe coding and agentic engineering are getting closer than I’d like

Simon Willison watches the line between 'vibe coding' (casual, unreviewed generation) and 'agentic engineering' (careful, quality-conscious use) dissolve in his own practice: he has started skipping line-by-line review of production code because the models are reliably right, then feeling guilty about it. His resolution is to treat AI-generated code like a trusted internal service -- lean on the interface and the tests rather than reading every line. It leaves an uncomfortable question open about when unreviewed machine code is genuinely safe to ship.

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