GitHub opens stacked PRs to coding agents

GitHub opened stacked pull requests in public preview, letting teams review multiple dependency-ordered layers in parallel and merge an entire stack in 1 operation. The launch includes the gh-stack CLI extension and a skill for coding agents, while existing checks, reviews, and branch protections still govern each layer. For teams navigating the widening contest to own the code repository, the practical implication is that agent-generated changes can stay small without forcing humans to manually rebase a thicket of dependent branches.