The body is lean and assumes Claude's competence — it does not explain what OSLog or unified logging is, and every section (Quick Start, Core Guidelines, Workflow, Checklist, Guardrails) earns its tokens.

It provides an executable Swift Logger pattern and copy-paste-ready shell commands such as `log stream --style compact --predicate 'subsystem == "com.example.app" && category == "Sidebar"'` and `./script/build_and_run.sh --telemetry`.

The 5-step Workflow is clearly sequenced with an explicit verification step and a feedback loop ('If it does not fire, move the log closer to the suspected control path and rerun'), reinforced by a Verification Checklist.

No bundle files exist; the single SKILL.md is self-contained and well organized into clearly signaled sections with no nested references, which satisfies the rubric's guidance for skills with no need for external references.

It names multiple concrete actions — 'Add and verify lightweight macOS runtime telemetry' and 'wiring Logger events' and 'inspecting logs' — rather than vague abstract language.

It explicitly answers both what ('Add and verify lightweight macOS runtime telemetry') and when via an explicit 'Use when wiring Logger events or inspecting logs...' clause.

Natural terms a macOS developer would actually say — 'telemetry', 'Logger events', 'logs', 'windows, sidebars, menus, and actions' — are well covered.

The macOS runtime-telemetry / Logger-events niche is distinct and unlikely to trigger for unrelated skills; it even redirects crash analysis to a separate skill in the body.