by Dan Shipper in Chain of Thought

​​TLDR: Today we’re launching a new experiment: Proof, an agent-native markdown editor that lets you collaborate on documents with multiple humans and AI agents—and tracks who wrote what. It’s available now for paid Every subscribers.

For the past two decades, Amazon’s “two-pizza rule” has been the gold standard for team size.

The story goes like this: At a company retreat in 2002, when Amazon managers wanted more communication, Jeff Bezos fired back that “communication is terrible!” A few weeks later, he restructured the company around small autonomous teams. If a team had more than 10 people—more than could be fed by two pizzas—it was too big.

Twenty-four years later, two-pizza teams are now themselves too big for building software products. When each employee is armed with Opus 4.6 and Codex 5.3, the ideal team size shrinks even further.

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