Elon Musk reposted a tweet from @tetsuoai, which noted that SpaceX AI engineer Lingxi Li performs code cleanup work while others are resting (3 AM), resulting in fewer conflicts and lower risk. His bot agent initiates a research agent that scans a single codebase for quality issues, poor modularity, redundant comments, and security vulnerabilities, generating a series of pull requests (PRs) by the time he wakes up.