This week, Amazon tightened review after a nearly six-hour retail outage and a 13-hour AWS incident tied to AI-written code, while Stripe's 11-task benchmark showed Claude Opus 4.5 hitting 92% on task

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Architecture Notes

A curated weekly newsletter covering AI coding incidents and guardrails, including Amazon tightening senior engineer review after outages tied to AI-written code, Stripe's benchmark showing Claude Opus 4.5 at 92% on full-stack integrations, and the NYT scaling unit test coverage from 28% to 83% using AI tools. Also covers 8 levels of agentic engineering, running multiple coding agents with tmux, deny-first sandboxing for macOS coding agents, sub-100ms API design patterns, and principles for working with AI coding agents without losing control.

Arc Notes Weekly #106: Arrowhead