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Vibe Coding2026-07-15 · source-backed
He argues a project's real shared language isn't English or Python but the common understanding of concepts, boundaries, invariants, and ownership, and that pre-AI friction like reviews and cross-team communication quietly did the work of aligning that. (Simon Willison) His warning: as agents remove that friction, you can lose the mechanism that kept mental models aligned. It reframes code review and docs as alignment infrastructure, not overhead to automate away.
Each link below shares sources, entities, or timing with this story.
CCP announced the migration covering code that has run on Stackless 2.7 since 2010. The approach is to run futurize across the codebase and then manually review roughly 20,000 places where Python 2 and 3 behavior diverges, including integer division (Simon Willison). No comple...
He handed Claude Fable 5, in Claude Code for web, the job of evaluating whether smolvm 1.8.3 could safely run untrusted Python and JavaScript under strict constraints. Verdict: it fits, with hardware-isolated VMs rather than shared-kernel containers, enforced CPU/RAM limits, g...
Simon Willison has been writing software for over 25 years. He's one of the most disciplined, transparent engineers in the Python ecosystem. And yesterday he published an essay admitting he no longer reviews every line of code that Claude Code generates for his production proj...
Thibault Sottiaux at OpenAI published an investigation into "a handful of reports where GPT-5.6 unexpectedly deleted files," finding it happens most commonly when full access mode is enabled in Codex. Simon Willison relayed it. A frontier lab publishing a first-party post-mort...
Mario Zechner wrote an essay. Simon Willison amplified it. The core argument: agentic code generation creates "cognitive debt," where mistakes compound faster than humans can review them, and the speed that makes agents attractive is precisely what makes their failures catastr...
Riffing on Apple's DRI management concept, he argues accountability requires an entity that can actually be held responsible, and a machine cannot (Simon Willison). It's a sharp, quotable counterweight to the "let the agent own it end-to-end" enthusiasm. I keep this one close...
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