CircleCI is launching 'Chunk sidecars', a new feature that runs scoped microbuilds before commit in a real CI mirror. Designed for AI coding agents (Claude Code, Codex, Cursor), it auto-detects your stack and averages ~27 seconds versus ~5 minutes for a full CI run, reducing token usage in retry loops by 3x–5x. The feature is free for all CircleCI users and aims to catch failures before code reaches shared CI.

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