Merged AI-Agent PRs Draw Verified Follow-Up Fixes at 1.62x the Odds of Human PRs, and 69.6% of Those Fixes Come From the Same Agent
arXiv·medium signal
arXiv 2609.26847 (22 Sep) follows 6,774 merged PRs from Codex, Copilot, Devin, Cursor and Claude Code in repos with 500+ stars, against 5,044 contemporaneous human PRs in the same repos. Agent merges attract verified fixes at 1.62 times the odds, 69.6% of those fixes come from the same agent, and 76.4% of fix PRs are agent-authored in every commit. Agents mostly clean up after themselves, but a merged agent PR is less finished than a merged human one.