GitHub Migrates Copilot Runtime to Rust, Uses Copilot to Assist the Migration
AI news brief: GitHub recently completed a massive system rewrite, migrating the Copilot agent runtime from its original language to Rust, with the new codebase reaching 800,000 lines of production-grade Rust code. The article emphasizes that a rewrite at this scale would have been prohibitively expensive without AI agent assistance, and the team actually used Copilot itself to carry out the migration — in other words, using an AI tool to rewrite the underlying system that powers the AI tool itself.