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---
name: principle-migrate-callers-then-delete-legacy-apis
description: "Apply when replacing an internal API without leaving ambiguous dual paths."
license: MIT
metadata:
author: jstack-maintainers
source: michael-denyer/pstack-claude
source-version: "0.9.130"
source-commit: d88063f3355a5ecff0e6dbb890a11bab4b08bc2e
owner: software-factory
risk: low
capabilities: jstack,engineering-principle
user-invocable: false
---
# Migrate Callers Then Delete Legacy APIs
- 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
