Hacker News (AI keywords)Jun 9, 2026, 7:58 PMcbrewster

Grit: Rewriting Git in Rust with Agents

GitButler details using AI coding agents to rewrite Git in Rust with a new project called Grit.

GitButler's Grit project aims to rewrite Git's C codebase in Rust, leaning heavily on AI coding agents to accelerate the migration. The post shares first-hand observations on where agents excel—understanding Git's object model, generating idiomatic Rust—and where they fall short, such as ownership edge cases and hallucinated behavior. It serves as a rare real-world case study of AI-assisted rewriting of complex systems-level software.

GitButler is a team led by GitHub co-founder Scott Chacon, who has long been deeply involved in Git toolchain development. This blog post centers around its new project, Grit — an ambitious plan to rewrite Git from scratch in Rust, aiming to replace the decades-old Git kernel written in C.

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