Claude Code Is 90% AI-Written. Here's the 7-Layer Code Review System That Keeps It From Collapsing

Description and use

<p>Anthropic says Claude writes about 90% of Claude Code's own code. From June to September, merged PRs more than doubled and reverts fell by over 40%.</p> <p>Your first instinct is probably "sure." Mine too. But the <a href="https://claude.dev/blog/solving-code-review-at-anthropic/" rel="noopener noreferrer">write-up on how the team does code review</a> hit the top of Hacker News for a reason: it's the first detailed look at what <em>AI-generated code review at scale</em> actually looks like. And some of it is genuinely good engineering.</p> <p>Let's go through it, steal what works, and poke

Problem

<p>Anthropic says Claude writes about 90% of Claude Code's own code. From June to September, merged PRs more than doubled and reverts fell by over 40%.</p> <p>Your first instinct is probably "sure." Mine too. But the <a href="https://claude.dev/blog/solving-code-review-at-anthropic/" rel="noopener noreferrer">write-up on how the team does code review</a> hit the top of Hacker News for a reason: it's the first detailed look at what <em>AI-generated code review at scale</em> actually looks like. And some of it is genuinely good engineering.</p> <p>Let's go through it, steal what works, and poke

Outcome

<p>Anthropic says Claude writes about 90% of Claude Code's own code. From June to September, merged PRs more than doubled and reverts fell by over 40%.</p> <p>Your first instinct is probably "sure." Mine too. But the <a href="https://claude.dev/blog/solving-code-review-at-anthropic/" rel="noopener noreferrer">write-up on how the team does code review</a> hit the top of Hacker News for a reason: it's the first detailed look at what <em>AI-generated code review at scale</em> actually looks like. And some of it is genuinely good engineering.</p> <p>Let's go through it, steal what works, and poke

Evidence

Claude Code Is 90% AI-Written. Here's the 7-Layer Code Review System That Keeps It From Collapsing

Source