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web/agent/skills/migration/SKILL.md

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+---
+description: "Implement reversible compatibility-safe transitions. Use for schema, data, API, protocol, configuration, or dependency migrations requiring rollback and preservation proof."
+---
+# 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.

web/agent/skills/migration/agents/openai.yaml

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+interface:
+  display_name: "Migration"
+  short_description: "Plan reversible data-safe transitions"
+  default_prompt: "Use $migration to implement this transition with compatibility and rollback proof."