GitHub Blog · AI & ML· Stephen Toub·· 2026-09-17
Migrating the GitHub Copilot runtime to Rust, using Copilot
Migrating the GitHub Copilot runtime to Rust, using Copilot
AI summary
A rewrite this size wasn't affordable before agents. Here's what porting the Copilot agent runtime to 800,000 lines of production Rust actually took.
Selection record
Threshold 60Official, first-handFirst 72Second 82
AdmittedSum of both 154 ≥ twice the threshold 120
- Source tier
- Official, first-hand; this tier's threshold is 60
- Pre-filter
- passed：GitHub Copilot运行时迁移至Rust，AI代理写代码
- Why it was chosen
- The author's first-hand account of the full TypeScript-to-Rust migration with AI agents is transferable to large-scale refactoring.
A model scores each item twice, independently, against one written standard, out of 100. An item is admitted only when the two scores add up to twice the threshold. The threshold is set per source tier.
Source: GitHub Blog · AI & ML · github.blog