Conciseness

The body is lean with no beginner padding and every code snippet targets a real gotcha, but 'Core Decisions' restates the Common Mistakes in prose and the References section re-lists the same files already routed in 'Route by Task' — minor trimmable redundancy that fits anchor 4 rather than the every-token-earns-its-place anchor 5.

Actionability

Each Common Mistake gives copy-paste-ready WRONG/CORRECT Swift covering the common failure cases (failable init, autoScales, coordinate conversion, main-actor mutation, identity check), and the Review Checklist names specific APIs — fully executable guidance matching anchor 5.

Workflow Clarity

The 5-step Workflow is clearly sequenced and includes an explicit verification step ('verify reload, rotation, large files, protected files, and annotation persistence') plus a review checklist, but it lacks a validate-then-fix feedback loop for failed saves, so it fits anchor 4 rather than anchor 5.

Progressive Disclosure

The entrypoint is a concise overview with three one-level-deep reference files that all exist in the bundle, each clearly signaled with task-based routing ('Read [core implementation details]… for loading, viewing, navigation…'), matching the well-signaled-references anchor 5.

Specificity

The description lists many concrete actions — 'embedding PDFView', 'creating or modifying PDFDocument instances', 'adding annotations (highlights, notes, signature widgets)', 'extracting text with PDFSelection', 'generating thumbnails', 'filling PDF forms', 'wrapping PDFView in SwiftUI' — matching the comprehensive-coverage anchor rather than anchor 4, which requires minor gaps.

Completeness

It clearly states what the skill does ('Display and manipulate PDF documents using PDFKit') and gives an explicit 'Use when…' clause with concrete trigger phrases, matching the anchor-5 example pattern; it is not anchor 4 because the 'when' is specific and enumerated rather than generic.

Trigger Term Quality

Good natural keyword coverage ('PDF files', 'forms', 'annotations', 'highlights', 'thumbnails', 'navigating pages') but it omits common synonyms and file extensions like 'PDFs' and '.pdf', so it fits anchor 4 ('a few natural terms missing') rather than anchor 5.

Distinctiveness Conflict Risk

Naming PDFKit and its specific classes (PDFView, PDFDocument, PDFSelection) plus SwiftUI establishes a clear niche with distinct triggers and minimal overlap with other document skills, matching anchor 5.