AI BriefingLessons from Bun's Zig-to-Rust Rewrite Finished in 11 Days with AI
·2026.07.17 01:50
Key point
The Bun team used 64 AI agents to rewrite 530,000 lines of code into Rust in just 11 days.
Details
The Bun team carried out a project to convert 535,496 lines of existing Zig code into Rust in order to resolve memory safety issues. This work, which would normally have been expected to take 1-2 years, was completed in just 11 days by deploying 64 AI agents.
The key elements behind the successful conversion were as follows:
- PORTING.md: A detailed 600-line guideline was written so that AI agents would follow consistent rules.
- Parallel conversion: Work was distributed on a per-file basis so that AI agents could work simultaneously.
- Adversarial Review: The converted code went through two rounds of rigorous review to verify it.
- Compilation and testing: Automated compilation and testing loops were used to continuously verify code integrity.
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