GitHub Puts Stacked Pull Requests Into Public Preview With a gh Extension and a Copilot Skill

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Announced 2026-07-30, stacked pull requests let a large change be split into ordered dependent PRs that each target the layer below, reviewed in parallel and merged individually or as a whole stack in one click, with automatic rebasing as layers land. Surfaces are the web PR pages with a stack map, GitHub Mobile, and a CLI installed via 'gh extension install github/gh-stack'; Copilot agents drive the same flow through a gh-stack skill. It respects existing branch protections and required checks, with merge queue support rolling out progressively. Rollout is to all repositories over the coming days with no plan tier called out.