principle-migrate-callers-then-delete-legacy-apis SKILL.md skillA

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Kind

SKILL.md skill

Repository

j-star-films-studios/vibecode-protocol-suite

Path

assets/.agent/skills/engineering-principles/migrate-callers-then-delete-legacy-apis/SKILL.md

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git:20260821.1b830a3, committed Aug 21, 2026

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ISC

Apply when introducing a new internal API while old callers still exist. Migrate callers and delete the old API in the same wave instead of preserving compatibility layers.

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What the file says

# Migrate Callers Then Delete Legacy APIs

When we decide a new API is the right design, migrate callers and remove the old API in the same refactor wave instead of preserving compatibility layers.

**Rule:**
- Do not keep legacy API paths alive only because internal callers still exist
- Inventory callers, migrate them, and delete the old API immediately
- Treat temporary adapters as exceptional and time-boxed, not default architecture
- Update tests to assert the new contract, and delete tests that only protect pre-refactor implementation details

**When this applies:**
- No external users depend on backward compatibility
- The project can absorb coordinated breaking changes
- The new API is part of a simplification or refactor initiative

Keeping both old and new APIs creates dual-path complexity, slows cleanup, and makes the codebase feel append-only.

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How to install

mdr add j-star-films-studios/vibecode-protocol-suite/principle-migrate-callers-then-delete-legacy-apis@sha256:e29b6b6534a23dca

[![mdr](https://markdownregistry.com/badge/art_r7jumgg4vm45aavr.svg)](https://markdownregistry.com/a/art_r7jumgg4vm45aavr)

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The registry has recorded 1 version of this file, committed on Aug 21, 2026.

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Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_r7jumgg4vm45aavr
GET https://markdownregistry.com/api/v1/resolve?ref=j-star-films-studios/vibecode-protocol-suite/principle-migrate-callers-then-delete-legacy-apis
GET https://markdownregistry.com/api/v1/blob/e29b6b6534a23dcaf8c7e16fc25d6484000d7b6e289c48eb0a32a97280633c5d

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