GitHub Copilot runtime rewritten in Rust using AI code
GitHub has ported the core runtime behind Copilot from TypeScript to over 800,000 lines of Rust code. Most of this massive rewrite was done by AI agents, not people, with just one developer overseeing the work over a few months. This new runtime powers Copilot features in VS Code, Outlook, Word, and more, delivering a speed boost and shared improvements across Microsoft products.
- Ported over 800,000 lines from TypeScript to Rust
- AI agents wrote most of the new code
- Single developer managed the rewrite
- Update affects Copilot CLI, app, and SDK
- Improved runtime now used in multiple Microsoft tools
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