Bugbot, a newly launched code review agent by Cursor, aims to automatically detect logic bugs, edge cases, and security issues in pull requests (PRs) before they reach production. Developed initially for internal use, Bugbot has become an essential tool for Cursor, operating directly from the Cursor dashboard to comment on detected issues within the code. By employing advanced models and techniques, Bugbot maintains a low false positive rate and allows for custom rules via BUGBOT.md to enhance review accuracy. During its beta phase, Bugbot reviewed over a million PRs and identified more than 1.5 million issues, with over half being resolved before PRs were merged. Engineering leaders from various companies have praised Bugbot for its ability to catch nuanced bugs, reduce the time spent on code reviews, and improve the review process, especially for AI-generated code.