Conciseness

The ~120-word body assumes Claude's competence: no explanation of what Storybook is, no padded sections, and every parenthetical ('package.json', '.storybook/', '11.0.0-alpha.x', '0.0.0-pr-*', the monorepo note) is load-bearing gating or context information. The version patterns are functional prerequisite logic, not date-branching deprecated-API content, so the time-sensitive penalty does not apply; this matches anchor 5 (lean, every token earns its place).

Actionability

Fully executable guidance: a copy-paste command ('npx storybook skills setup') with run-location context, concrete existence checks ('package.json', '.storybook/'), exact version patterns for alpha/canary builds, and exact routing targets ('/storybook-init', '/storybook-upgrade'). The common cases (not installed, too old, valid) are each branched, matching anchor 5; the absence of further code is appropriate for an instruction skill that delegates to the tool's printed output.

Workflow Clarity

The sequence is unambiguous: validate prerequisites (existence plus version) with explicit failure branches and switch-and-return recovery ('come back here afterwards'), then run the command, then 'Follow the printed Markdown precisely.' This is a simple single-purpose skill under 50 lines whose steps include explicit entry validation with error-recovery routing, matching anchor 5 rather than 4, where anchor 4 would require a missing checkpoint that is not present within the skill's scope.

Progressive Disclosure

The skill is 14 lines with no bundle files and no content that belongs in separate references; per the rubric's simple-skill note, under-50-line skills with no need for external references score 5 with well-organized sections. The body is cleanly organized (prerequisites list, command, directive) and delegates detail to the command's printed Markdown rather than inlining it.

Specificity

The description names the domain ("Storybook") and two concrete artifacts ("a working `preview` file and stories for real components") but never states the skill's actions — no capability verbs like 'configures' or 'writes'; the what is implied from the user's desired outcome. This matches anchor 3 (domain plus 1-2 concrete items, not comprehensive): below 4 because no several specific actions are listed, above 2 because it is far more concrete than 'Processes PDF files'.

Completeness

The 'when' is explicit and well-bounded ('Use this skill when Storybook is already installed and the user wants...'), including a precondition that fences off install/upgrade scenarios. The 'what' is present but indirect — phrased as what the user wants ('a working `preview` file and stories') rather than what the skill does — so it falls short of anchor 5's 'clearly and explicitly answers both what AND when'.

Trigger Term Quality

Natural terms users would say are present: 'Storybook', 'preview file', 'stories', 'components'. A few common variations are missing (e.g., 'CSF', 'story files', '*.stories.ts', 'configure Storybook'), which fits anchor 4 (good coverage, a few natural terms missing) rather than 5 (comprehensive coverage including synonyms and file extensions).

Distinctiveness Conflict Risk

'Storybook' is a highly specific niche term and 'already installed' plus the concrete deliverables (preview file, stories for real components) give it distinct triggers with minimal conflict risk against install/upgrade skills, matching anchor 5.