Conciseness

Lean and efficient at ~80 words with no padding or explanations of concepts Claude already knows; every line is actionable and every token earns its place.

Actionability

Concrete, specific instructional guidance ('Sequence expand, migrate, verify, then contract', 'Make retries idempotent and partial failure observable') with no wasted abstraction, but it stays at a high-level process altitude without specific commands or tooling examples.

Workflow Clarity

Clear sequence (map -> expand -> migrate -> verify -> contract) with explicit validation checkpoints ('Verify old and new paths at required transition stages', 'Stop after requested stage passes'), avoiding the destructive-skill cap, though a concrete fix-and-retry feedback loop is only implicit.

Progressive Disclosure

Under 50 lines with no need for external references and no bundle files; the body is well-organized with a heading, framing sentence, bulleted checklist, and closing guard, which satisfies the simple-skill exception.

Specificity

Names the action ('Implement reversible compatibility-safe transitions') plus several concrete domains (schema, data, API, protocol, configuration, dependency migrations), but lists domains rather than multiple distinct concrete actions, so it sits just below the comprehensive 5 anchor.

Completeness

Explicitly answers what ('Implement reversible compatibility-safe transitions') and when ('Use for schema, data, API, protocol, configuration, or dependency migrations requiring rollback and preservation proof') with concrete trigger phrases.

Trigger Term Quality

Natural terms users would say are present ('migrations', 'schema', 'rollback', 'API', 'dependency'), with good coverage, though some common variations like 'deploy' or 'version bump' synonyms are missing.

Distinctiveness Conflict Risk

Occupies a clear niche (reversible, rollback-required migrations with preservation proof) with distinct triggers and minimal overlap risk with unrelated skills.