AnalysisDevelopersSeptember 17, 2026

GitHub rewrote Copilot agent runtime in 800,000 lines of Rust

GitHub ported the Copilot agent runtime from TypeScript on Node.js to over 800,000 lines of production Rust, with AI agents writing most of the code across 128 pull requests. The work was done primarily by a single developer in a few months, a project GitHub says would have taken a team a year or two before agents.

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