Dependency Upgrade Planner

Every team dreads major dependency upgrades. React 18 to 19. Next.js 14 to 15. Node 18 to 22. This skill transforms the chaos into a repeatable process.

It walks your agent through: (1) Impact Assessment — inventory current state, fetch official migration guides, grep your codebase for affected patterns, and build a breaking change register. (2) Risk Scoring — rate the upgrade 1-25 across five dimensions (breaking changes, surface area, test coverage, rollback complexity, ecosystem readiness) with clear go/wait thresholds. (3) Phased Migration Plan — structured day-by-day plan from foundation fixes through canary deployment. (4) Codemod Execution — run official codemods (React, Next.js, Angular, Vue) or write custom jscodeshift transforms for automated refactoring. (5) Rollback Strategy — pre-planned triggers, steps, and edge cases for when things go wrong. (6) Post-Upgrade Verification — performance benchmarks, bundle size comparison, and test validation.

Includes ready-made upgrade recipes for React 18→19, Next.js 14→15, Node.js 18→22, and Python 3.10→3.13. Works with any language or framework — the methodology is universal.

Different from dependency auditing (vulnerability scanning). This is about PLANNING the upgrade — knowing what will break, how to fix it, and how to roll back if needed.