Definition
AI-assisted code rewrite uses fleets of coding agents to mechanically translate large codebases between languages or architectures. The July 2026 Bun Zig→Rust migration (~1M lines, 11 days, ~$165k API) became a flashpoint for review-quality debates.
Key Points
- Bun claims adversarial agent review + test suite sufficiency
- Zig creator Andrew Kelley called output “unreviewed slop”; blames engineering practices not Zig
- Raises questions about maintainability, liability, and OSS AI contribution policies