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/deprecation-and-migration

Plan deprecation and migration—replacement first, consumer migration, strangler and adapter patterns, zombie code removal. Use when sunsetting APIs, libraries, or legacy modules.

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awesome-agent-skill
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$ npx -y skills add charlieviettq/awesome-agent-skill --skill deprecation-and-migration --agent claude-code

SKILL.md

deprecation-and-migration.SKILL.md
name: deprecation-and-migration
description: "Plan deprecation and migration—replacement first, consumer migration, strangler and adapter patterns, zombie code removal. Use when sunsetting APIs, libraries, or legacy modules."
allowed-tools: Read, Glob, Grep

Deprecation and migration

Decision questions

1. Does the old system still provide unique value? 2. How many consumers? Migration cost each? 3. Is replacement production-proven? 4. Cost of NOT deprecating (security, maintenance)?

Compulsory vs advisory

| Type | When | |------|------| | Advisory | Stable legacy, optional migration | | Compulsory | Security risk, blocks progress — need tooling + deadline |

Default advisory unless risk justifies force.

Process

1. **Build replacement** first 2. **Announce** — status, replacement, migration guide, timeline 3. **Migrate consumers** incrementally; owner migrates users when possible 4. **Remove** only after zero active usage verified

Patterns

| Pattern | Use when | |---------|----------| | Strangler | Gradual traffic shift | | Adapter | Old interface, new implementation | | Feature flag | Per-consumer or cohort cutover |

Zombie code signals

  • No maintainer, active dependents, failing tests ignored, stale deps

Output

Deprecation notice + migration steps + removal checklist.

Read it on GitHub ↗
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Questions about deprecation-and-migration.

Which coding agents can use deprecation-and-migration?
deprecation-and-migration installs in Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf with the skills CLI, using each agent's flag shown on this page. Flowy's auto-invocation, which fires a skill when your prompt matches, runs in Claude Code only.