What problem does it solve? Upgrading a schema or versioned artifact without breaking downstream consumers is risky: compatibility gaps, missing backups, and absent rollback paths can turn a routine version change into an incident. This Skill produces a governed migration plan with deterministic validation gates before any cutover happens. ## Core Features & Use Cases - Migration Planning: Defines phased migration steps covering preflight checks, backup or snapshot, forward change, verification, and rollback triggers. - Compatibility Matrix: Maps producer/consumer version combinations using dependency evidence from the skill dependency graph to identify required phased rollouts. - Rollback-First Safety: Produces rollback plans with objective triggers, restore order, and post-rollback validation, and fails closed when evidence is missing. - Use Case: When a report schema version changes and existing records must migrate, use this Skill to generate reports/artifact-upgrade-plan.json and reports/artifact-upgrade-report.md with forward and rollback sequences before touching any versioned artifact. ## Quick Start Ask the agent to plan a migration for the target schema or artifact, including a compatibility matrix, backup requirements, and a rollback plan with validation gates.
