Building a better Bugbot (cursor.com)

Bugbot, a sophisticated code review agent, has been unveiled to enhance software development by analyzing pull requests for logic bugs, performance issues, and security vulnerabilities before they reach production. Since its launch, Bugbot has undergone significant improvements, raising its bug resolution rate from 52% to over 70% through 40 major experiments. Utilizing an AI-driven metric called resolution rate, the tool determines the actual bugs resolved during the merge process, providing teams with clear insights into its effectiveness. The development of Bugbot involved intricate processes, such as running multiple parallel bug-finding passes with randomized diff orders and integrating a dynamic context management system to adaptively gather information. A shift to an agentic design allowed Bugbot to independently reason over code and make decisions during the review, leading to improved performance and reduced false positives. As it currently reviews more than two million pull requests monthly for major clients, Bugbot is already seeing plans for features like Autofix, which automatically addresses identified bugs, and continuous codebase scanning. These advancements position Bugbot as a pivotal tool in enhancing code quality and efficiency in AI development workflows.