Conciseness

Every line is directive with zero padding or explanation of concepts Claude already knows ('store UTC, convert at display, test DST days, month ends, and exact expiry boundaries; use test clocks'). It assumes Claude's competence and every token earns its place, matching the lean-and-efficient 5 anchor.

Actionability

As an instruction-only skill it provides concrete, specific directives covering the common cases: integer cents with one rounding mode and explicit currency, boundary tests at/one-under/one-over, flags tested on and off per role, notifications exactly once with opt-out respected. Per the rubric's scoring note, absence of code is not penalized when the guidance is this actionable, so it matches the 5 anchor.

Workflow Clarity

A clear 7-step numbered sequence with an explicit halt checkpoint (step 1: 'stop: NEEDS-PRODUCT-DECISION') and an Exit criteria section acting as a final checklist. It is not a 5 because the validate -> fix -> retry loop for the boundary tests (write, run, address failures) is implied by 'execution evidence' rather than given as an explicit feedback loop.

Progressive Disclosure

The skill is under 50 lines, self-contained with no external detail files needed (no references/, scripts/, or assets/ exist in the bundle), and organized into clear Procedure and Exit criteria sections. Under the rubric's simple-skill exception this matches the 5 anchor for well-organized short skills.

Specificity

The description states a concrete action ('Fix business-rule defects') with a stated method ('centralizing each rule in one tested place') and enumerates ten specific domains (time zones, DST, money rounding, currency, taxes, quotas, feature flags, caching staleness, notifications, policy transitions). It falls just short of the 5 anchor because it lists domains comprehensively but relies on only two action verbs rather than multiple distinct concrete actions.

Completeness

It explicitly answers both 'what' ('Fix business-rule defects... by centralizing each rule in one tested place') and 'when' ('Use when prices, dates, limits, entitlements, or notifications are wrong') with concrete trigger phrases, matching the 5 anchor exactly. It is not a 4 because the when-clause is present and specific rather than vague or only implied.

Trigger Term Quality

'Use when prices, dates, limits, entitlements, or notifications are wrong' plus 'time zones, DST, currency, taxes, quotas, feature flags, caching' are natural phrases users would say when needing this skill. A few common variations (e.g., billing, rounding is off, expiry) are missing, so it fits anchor 4 rather than the comprehensive synonym coverage of anchor 5.

Distinctiveness Conflict Risk

The business-rule/policy niche (taxes, quotas, entitlements, policy transitions, caching staleness) with triggers like 'prices... limits, entitlements... are wrong' is a clear niche with distinct triggers and minimal conflict risk. Minor overlap with generic date/notification-handling skills keeps it from being indistinguishable from any other skill, but the fit is closest to anchor 5.