GitHub ships Stacked PRs — big features in small, reviewable chunks
GitHub's native gh-stack extension (private beta, waitlist required) lets you break large changes into a chain of linked PRs that cascade rebases automatically. Research on 1.5M PRs found that 200–400 line PRs have 40% fewer defects and get approved 3× faster. Achal specifically called this out as interesting "for working with AI models to build large features but in a smaller chunked out manner" — which is exactly the pattern agentic engineering needs.