# Execute Hard Cutover

> Replace a predecessor with one destination and retire the old path in the same delivery. Use for system, API, package, instruction, installer, configuration, or data migrations that require a single final authority.

- Skill: `sylphxai/execute-hard-cutover` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add sylphxai/execute-hard-cutover`
- Raw SKILL.md: https://api.skillmd.com/api/skills/sylphxai/execute-hard-cutover/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: SylphxAI (https://skillmd.com/u/sylphxai)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/sylphxai/execute-hard-cutover

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# Execute Hard Cutover

One destination. Switch authority once. Retire the predecessor in the same delivery. Keep one production writer at completion. A compatibility shim left as the real writer is not a cutover.

Open [database cutover](references/database-cutover-and-migration.md) for online schema changes, conserved-value data, large-table locking, or shared multi-tenant state.

Use `migrate-customer-data` when the job is preserved semantics rather than the authority switch.