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ScinoScino/fstack/skills/principle-migrate-callers-then-delete-legacy-apis/SKILL.md

principle-migrate-callers-then-delete-legacy-apis

Skill18 starsChanged 55 days agoMITView on GitHub

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.

45 other projects use a version of this, 42 of them edited.

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Projects with it also use principle-explain-the-number, setup-pstack and 10 more.

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The file

We split this skill into the rules it gives an agent

5 rules. 5 are common, 0 are distinctive, and 0 are very specific to this project.

  • 5

    Common

    Most of the 45 edited versions we read keep these.

  • 0

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Common:

    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 …

    line 10
  2. Common:

    Do not keep legacy API paths alive only because internal callers still exist

    line 13
  3. Common:

    Treat temporary adapters as exceptional and time-boxed, not default architecture

    line 15
  4. Common:

    Update tests to assert the new contract, and delete tests that only protect pre-refactor implementation details

    line 16
  5. Common:

    No external users depend on backward compatibility

    line 19

“Common” is measured: kept by at least 6 in 10 of the 45 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

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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