# AI Reviewer

Anthropic's Claude Code team moved most code reading to automated review and kept humans for high-risk decisions. From June to September, merged pull requests to the Claude Code codebase more than doubled while the share that had to be reverted fell by more than 40 percent. Claude verifies changes before submission with runnable tests or builds, every pull request gets a multi-agent bug review with voting filters, and risk tiers set how many human approvals a change needs.

Anthropic's Claude Code team moved most code reading to automated review and kept humans for high-risk decisions. From June to September, merged pull requests to the Claude Code codebase more than doubled while the share that had to be reverted fell by more than 40 percent. Claude verifies changes before submission with runnable tests or builds, every pull request gets a multi-agent bug review with voting filters, and risk tiers set how many human approvals a change needs.

Across the same 60 change requests and one fixed model, two architectures finished within 7% to 20% on complexity amount but differed by 2.7 to 10 times on how far their placement could be moved, and only an AI reviewer moved the additive one.

Across the same 60 change requests and one fixed model, two architectures finished within 7% to 20% on complexity amount but differed by 2.7 to 10 times on how far their placement could be moved, and only an AI reviewer moved the additive one.