Conciseness

The body is dense and high-signal with no concept padding (it never explains what a daemon, file lock, or event broker is) and assumes Claude's competence throughout. It is not a 5 because some bullets enumerate long lists of regression test names and use heavy compound sentences that could be trimmed without losing meaning.

Actionability

Although it is instruction-only with no copy-paste code, the guidance is maximally concrete: specific file paths (internal/daemon/lock.go), function names (RunWithOptions, waitForDaemonStop), explicit ordering constraints, numeric bounds (64 events, 1 MiB, 512 KiB, 45s, --wait 8m), commands (--force, no-mistakes daemon run --root), and named regression tests. The rubric's code-vs-instruction note protects instruction skills from a code-absence penalty when guidance is this actionable.

Workflow Clarity

Multi-step sequences are clearly ordered (lock before recovery before socket bind; PID record after lock before recovery; capture instance then close shutdown client before waiting) and the destructive lifecycle guard provides explicit validation (refuse while pending/running runs, require --force), so the destructive-operation cap at 3 does not apply. It is not a 5 because the content is a collection of ordered invariants rather than a single end-to-end workflow with explicit checkpoints.

Progressive Disclosure

The body is organized into four clearly signaled bold-header sections covering distinct subsystems with good internal structure. No bundle files exist and all content is inline in one file; because the skill is well over 50 lines and some sections (e.g. the event-mailbox rules) could plausibly be split into one-level-deep references, it is a 4 rather than a 5.

Specificity

The description enumerates several concrete change-areas ("daemon startup, singleton ownership, shutdown, logging, event subscriptions, or lifecycle commands") rather than vague language, though the single verb "changing" is generic. It lists several specific actions with minor coverage gaps, matching the 4 anchor and sitting above the 3 anchor's "1-2 concrete actions."

Completeness

An explicit "Use when..." clause answers "when" clearly and concretely, and the enumerated domain list conveys the "what" implicitly. It is not a 5 because no statement explicitly says what the skill does (e.g. "documents invariants for..."), and not a 3 because the "when" is strong and specific rather than weakly implied.

Trigger Term Quality

Terms like "daemon startup," "shutdown," "logging," "event subscriptions," and "lifecycle commands" are ones a developer on this codebase would naturally say, giving good keyword coverage. It is not a 5 because some phrases ("singleton ownership") are jargon and common synonyms/variations are missing.

Distinctiveness Conflict Risk

The description carves a clear niche (this codebase's daemon runtime) with specific, scoped triggers, so conflict with unrelated skills is minimal. Although "logging" and "event subscriptions" are general concepts, they are bound to "daemon," keeping overlap risk low enough for the 5 anchor.