Conciseness

The body is generally lean with no over-explanation of concepts Claude already knows, but section 3's 'Prioritize likely SwiftUI culprits' list is a verbatim six-bullet repeat of section 1's 'Focus on' list — a full duplicated block that should be tightened. This fits anchor 3 ('mostly efficient but includes some unnecessary... could be tightened'); it is not a 4 because a wholesale duplicated list is more than a minor trim, and not a 2 because the rest is efficient and unpadded.

Actionability

Concrete, executable Swift snippets for each code smell (formatter allocation, unstable identity, main-thread image decoding) with corrected versions, plus specific commands like 'Use the SwiftUI template in Instruments (Release build)'. It is not a 5 because the Remediate section's fixes ('Narrow state scope', 'Use equatable()') are named without code examples or specific steps, and not a 3 because the smell section gives copy-paste-ready patterns.

Workflow Clarity

The decision tree up front ('If code review is inconclusive, go to Guide the User to Profile') plus the sequenced 1–5 sections ending in a Verify step ('re-run the same capture and compare with baseline metrics') give a clear sequence with an explicit verification checkpoint and a recovery branch. It is not a 5 because the verify step is conditional ('if provided') with no explicit loop back to Remediate when deltas are unsatisfactory, and not a 3 because validation checkpoints are present, not merely implied.

Progressive Disclosure

The References section signals one-level-deep, clearly-named links that all resolve to real files in references/ (verified: all four listed paths exist with substantive content), and the SKILL.md stays an overview plus a reasonable inline checklist. It is not a 5 because the large Common Code Smells section (seven subsections with code) is prime material for a references/ split, and the line 'Add Apple documentation and WWDC resources under references/ as they are supplied by the user' is confusing given the files already exist; not a 3 because the structure and navigation are good.

Specificity

"SwiftUI performance: render, scroll, CPU/memory, updates, layout, Instruments." names the domain and enumerates sub-areas, but contains no action verbs at all (no 'audit', 'profile', 'fix') — it is a topic list, not a description of capabilities. This matches anchor 2 ('Names the domain but actions are minimal or generic'); it is not a 3 because there are no concrete actions stated, and not a 1 because the domain and specific focus areas are clearly identified.

Completeness

The 'what' is only weakly implied (a topic list with no verb), and the 'when' is entirely absent — there is no 'Use when...' clause or equivalent trigger guidance, which caps completeness at 3 and the vague what pushes it below. It fits anchor 2 ('Has a vague what and no when'); it is not a 3 because even the what lacks a stated action, and not a 1 because the domain is clearly named.

Trigger Term Quality

Terms like "SwiftUI", "performance", "scroll", "CPU/memory", "layout", and "Instruments" are natural words a user would say when needing this skill (e.g. 'my SwiftUI list is slow scrolling', 'high CPU in my app'). It is not a 5 because common user phrasings like 'slow', 'laggy', 'jank', 'frame drops', and 'hangs' are absent, and not a 3 because the present keywords are specific and directly match real user vocabulary.

Distinctiveness Conflict Risk

"SwiftUI performance" carves out a clear niche and the enumerated areas (render, scroll, CPU/memory, Instruments) make it mostly distinguishable from generic Swift or UI-testing skills. It is not a 5 because the description lacks distinct trigger phrases that would unambiguously route 'my app is slow' type queries to it over a general profiling skill, and not a 3 because the overlap risk is minor.