Migration

The migration skill is for transitions where you can't just flip a switch: schema changes, data backfills, API version bumps, protocol upgrades, config format changes, or dependency swaps that have to coexist with running code. Before touching anything, it makes the agent map current readers, writers, and the compatibility window, then requires an explicit forward path and rollback path. It pushes the expand, migrate, verify, contract sequence and keeps destructive steps behind a separate authorization, which is the part most people skip under deadline pressure. It also stops once the requested stage passes instead of quietly running the cleanup. The honest caveat is that it's a discipline more than a tool: it structures the work well, but you still need to know your system's real readers and writers, and the skill can't discover traffic patterns you haven't told it about.

skills.sh installs: 118.4K
GitHub stars: 118.7K
last updated: Oct 26, 2026

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Install

$ npx -y skills add juliusbrussee/caveman --skill migration --agent claude-code

Installs into .claude/skills of the current project.

Files

Migration

Map current readers, writers, data shape, compatibility window, and ownership before editing.

Define forward path and rollback path.
Preserve existing data; make destructive steps explicit and separately authorized.
Keep mixed-version operation safe where rollout can overlap.
Sequence expand, migrate, verify, then contract when applicable.
Make retries idempotent and partial failure observable.
Verify old and new paths at required transition stages.

Stop after requested stage passes; do not perform later destructive contraction implicitly.

SKILL.md on GitHub

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