Conciseness

Mostly efficient — the examples teach genuinely new Swift 6.2 semantics rather than re-explaining basics — but 'When to Activate' and 'When to Use' duplicate each other almost entirely, Best Practices and Anti-Patterns overlap, and one anti-pattern ('Skipping model.availability checks in concurrency-related Foundation Models code') is off-topic. Fits anchor 3 (mostly efficient with some unnecessary content that could be tightened).

Actionability

Provides compile-shaped code examples for each pattern, a concrete 4-step checklist for adopting @concurrent, and a 6-step migration sequence. Not 5 because the @concurrent example's core function is a '/* ... */' placeholder and the migration steps give directions ('Use SwiftSettings API', 'Swift Compiler > Concurrency section') without exact values or snippets.

Workflow Clarity

The 'Migration Steps' section gives a clear ordered sequence, but validation is only gestured at ('Test thoroughly') with no build/test commands, no expected compiler-error checkpoints, and no error-recovery loop. This matches anchor 3 — steps listed but validation checkpoints missing or implicit.

Progressive Disclosure

No bundle files exist and the body contains no dangling references; sections are clearly headed and navigable. At ~215 lines, detailed pattern walkthroughs and the Key Design Decisions table could live in reference files, so it fits anchor 4 (good structure, minor organization gaps) rather than 5.

Specificity

Names the domain ('Swift 6.2 Approachable Concurrency') and three concrete capabilities ('single-threaded by default, @concurrent for explicit background offloading, isolated conformances for main actor types'), but the what-clause omits other covered actions like migration and data-race error resolution. Matches anchor 4 — several specific actions with minor gaps — rather than 5's comprehensive coverage.

Completeness

Both parts are present: a clear what (three named capabilities) and an explicit trigger clause ('Use when adopting Swift 6.2 concurrency — offloading with @concurrent or resolving main-actor isolation'). The when-clause is concrete but narrow, omitting triggers like migration from Swift 5.x/6.x and data-race compiler errors, so it fits anchor 4 rather than 5.

Trigger Term Quality

Includes natural terms users would say ('Swift 6.2', 'concurrency', '@concurrent', 'main-actor isolation', 'background offloading'). Not 5 because common phrasings like 'data race', 'migrate', or 'background thread' are absent from the description even though the skill covers them.

Distinctiveness Conflict Risk

The description is pinned to a highly specific niche (Swift 6.2, @concurrent, isolated conformances, main-actor isolation) with distinct trigger terms, so overlap with other skills is minimal — matches anchor 5.