Conciseness

Mostly efficient — code examples earn their place and prose is minimal — but it could be tightened: the 'When to Activate' and 'When to Use' sections repeat nearly the same four bullets, and 'Best Practices' partially restates points from the inline code comments. Not 4 (no padding is merely trimmable) because a full duplicated section is more than a minor instance of over-explanation.

Actionability

The core pattern is shown as complete, executable Swift code (protocols, default implementations, mocks, actor injection, Swift Testing tests). Minor gaps keep it from 5: the test examples reference `MockFileSystemProvider`, `manager.loadData()`, `Purpose`, and `SyncError`, none of which are defined in the shown code, so the examples are not fully copy-paste ready.

Workflow Clarity

The five numbered steps (define protocols → defaults → mocks → inject → test) form a clear, coherent sequence with the intent of each step stated. Not 5 because there are no explicit checkpoints (e.g., guidance on verifying a type actually needs a protocol before abstracting, or how to migrate existing code); not 3 because the sequence itself is complete and unambiguous for this non-destructive design task.

Progressive Disclosure

Good single-file structure with clear section headers, each step focused and appropriately sized; no bundle files exist to reference, and at ~190 lines the inline content is cohesive rather than monolithic. Not 5 because the skill exceeds the simple-skill threshold and content like the extended mock implementations or the anti-pattern catalog could live in a referenced file to slim the overview.

Specificity

The description lists several concrete actions — 'mock file system, network, and external APIs using focused protocols and Swift Testing' — with only minor gaps in coverage (no mention of defining protocols or default production implementations). It sits between the 5 anchor ('comprehensive coverage') and the 3 anchor ('1-2 concrete actions'): more than a couple of actions, but not fully comprehensive.

Completeness

It has a clear 'what' (protocol-based DI for mocking external dependencies in Swift) but no 'Use when...' clause or equivalent trigger guidance, which caps completeness at 3 per the rubric guidelines. Not 4 because the 'when' is entirely absent rather than merely implicit-but-present.

Trigger Term Quality

Natural terms a user would say are present: 'Swift', 'testable', 'mock', 'dependency injection', 'Swift Testing', 'file system', 'network'. A few common variations are missing (e.g., 'unit test', 'stub', 'DI', 'XCTest'), so it falls just short of the comprehensive-synonyms anchor at 5.

Distinctiveness Conflict Risk

The combination of 'Protocol-based dependency injection', 'testable Swift code', and 'Swift Testing' carves a distinct niche; overlap risk is limited to closely related Swift-testing skills. Not 5 because terms like 'mock' and 'test' alone could plausibly activate it for generic Swift mocking questions outside its scope.