Research
248,641 GitHub Pull Requests Show AI Agents Reviewing Other AI Agents' Code, Up Two Orders of Magnitude in Three Quarters
AI-to-AI Code Reviews of GitHub Pull Requests (arXiv 2608.21311, Aug 21) links AI-attributed PRs to AI-attributed review events from the CodAGE dataset, assembling 248,641 unique agent-authored PRs that received at least one agent review. Cross-product review (one vendor's agent reviewing another's code) occurred in roughly 1.6% of agent-authored PRs but grew by more than two orders of magnitude from 2025-Q1 to 2025-Q3. Reviewer behavior varied by author: CodeRabbit labeled 35.0% of its comments on Claude Code-authored PRs as refactor comments versus 10.5% on Copilot-authored PRs, and median review latency was 1.2 minutes cross-product versus 4.7 minutes same-product.
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