"Stacked pull requests, sometimes called dependent or chained PRs, are a code-review pattern in which each branch targets not the main branch but the branch immediately below it in a series. This approach allows developers to continue work on later layers of a feature while earlier layers are still under review."
"Research cited in the launch announcement suggests the workflow has measurable benefits. An analysis of 1.5 million pull requests found that PRs between 200 and 400 lines had 40% fewer defects and were approved three times faster than larger ones."
"The primary command, gh stack sync, cascades a rebase across the entire stack and force-pushes each branch atomically after a change to an earlier layer. GitHub's pull request interface gains a stack map that lets reviewers navigate between layers."
GitHub has launched a new CLI extension called gh-stack to facilitate stacked pull request workflows. This tool addresses challenges associated with large pull requests, which are often difficult to review and prone to conflicts. Stacked pull requests allow developers to work on multiple layers of a feature simultaneously. Research indicates that smaller pull requests lead to fewer defects and faster approvals. The gh-stack extension integrates with the GitHub CLI, automating the management of stacked workflows and enhancing the review process with features like a stack map and AI agent integration.
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