Conciseness

The body is dense and operational — bash guards, a complete TypeScript wrapper, and terse notes — with almost no explanation of concepts Claude already knows. Minor trimming is possible: the `cd -- '<working_dir>' || { echo BLOCKED... }` guard is repeated verbatim in three code blocks, and the Notes section restates the https://file:// constraint already enforced in the code. This matches anchor 4 ('efficient; minor instances of over-explanation that could be trimmed') rather than anchor 5, whose every token would earn its place.

Actionability

Guidance is fully executable: copy-paste-ready bash verification with explicit failure handling and STOP conditions, a complete discriminated-union TypeScript wrapper with all error paths, a concrete integration example, and a `npx --no-install tsc --noEmit` check. This matches anchor 5 ('fully executable; copy-paste ready code or commands; specific examples cover the common cases'); it is clearly above anchor 4, which allows minor gaps.

Workflow Clarity

Steps 1–8 are clearly sequenced with explicit validation checkpoints and feedback loops: app verification with a hard STOP, package/version verification with a hard STOP and named failure reasons, artifact reconciliation before writes, and a type-check step that says to fix in-scope errors and recheck, explicitly noting 'type-check success alone is insufficient'. This matches anchor 5 ('clear sequence with explicit validation steps; feedback loops for error recovery') and exceeds anchor 4, whose checkpoints may have minor gaps.

Progressive Disclosure

Structure is good: a clearly signaled pointer to shared plugin instructions and a one-level-deep referenced compatibility contract (with step anchors) at the top, well-labeled sections, and the wrapper/usage code appropriately inline. It falls short of anchor 5 because the long inline `node -e` version-check block (~500 characters on one line) is script-shaped content that belongs in a scripts/ file, and no bundle files are provided at all — a minor organization gap consistent with anchor 4 ('most content is appropriately placed; references mostly clear').

Specificity

The description names the domain ('native PDF control workflows', 'HTTPS and file URI PDF viewing') and one concrete capability with a specific package and version, but stops short of listing multiple concrete actions such as generating the wrapper, verifying the installed version, or type-checking. This matches anchor 3 ('names domain and 1-2 concrete actions, but not comprehensive') and is below anchor 4, which expects several listed specific actions, while clearly exceeding anchor 2's generic single-verb action.

Completeness

The 'what' is explicit ('Handles HTTPS and file URI PDF viewing with @microsoft/power-apps-native-pdf-viewer 0.2.9+') and the 'when' is given as explicit trigger guidance ('Internal implementation skill invoked by /add-native for native PDF control workflows'), which is equivalent to a 'Use when...' clause for a routed internal skill. It sits below anchor 5 because the when-clause describes routing rather than concrete user-request trigger phrases (e.g., 'add a PDF viewer to my app'), matching anchor 4 ('both what and when present; when could be more explicit or specific').

Trigger Term Quality

It includes relevant keywords a user might echo ('PDF viewing', 'PDF control', the package name, '/add-native'), but misses common natural variations like 'PDF viewer', 'open a PDF', or 'view a PDF in the app'. This fits anchor 3 ('some relevant keywords but missing common variations or synonyms'), not anchor 4's 'good keyword coverage; a few natural terms missing', because several natural user phrasings for this capability are absent.

Distinctiveness Conflict Risk

It carves out a clear niche: native PDF viewing with one specific Microsoft package, a version floor, HTTPS/file:// scope, and explicit /add-native routing. This minimizes overlap with related skills (e.g., PDF generation or document picking), matching anchor 5 ('clear niche with distinct triggers; minimal conflict risk') rather than anchor 4, which requires some residual overlap risk with closely related skills.