What problem does it solve? Large pull requests over 400 changed lines overwhelm reviewers, slow down merges, and hide defects. This Skill enforces a structured workflow that splits oversized changes into chained or stacked PRs so each slice stays reviewable in under an hour. ## Core Features & Use Cases - Size-Based Decision Gates: Automatically routes PRs over 400 changed lines into either Stacked PRs to main or a Feature Branch Chain with a draft tracker PR. - Chain Context Templates: Adds a standardized Chain Context section with dependency diagrams, review budgets, and scope boundaries to every child PR without replacing the repo PR template. - Diff Hygiene Enforcement: Treats polluted diffs as base bugs, requiring retargeting or rebasing until each PR shows only its own work unit. - Use Case: A developer finishes a 1,200-line feature. The Skill splits it into three child PRs targeting a tracker branch, each with a dependency diagram marking its position, so reviewers approve focused slices in order. ## Quick Start Ask the assistant to split this oversized feature branch into chained PRs under the 400-line review budget.