Conciseness

The body is aggressively token-efficient — "Write only under `<root>/project/`: a file elsewhere never shows" — and assumes Claude's competence throughout, explaining nothing the model already knows. It is not score 5 because a few rules are repeated across sections (the index-written-LAST rule appears in "A system kept in files", "What a system holds", Creating step 3 and Revising step 3; upload rules appear in three places), which could be consolidated. It is not score 3 because there is no padded or unnecessary explanation anywhere — the density is deliberate and almost all of it earns its place.

Actionability

Mostly executable: exact command signatures with JSON outputs ("upload <root> <file> --group <Group>", "check <root> → problems", the full copy-paste pre-commit hook script), exact JSON shapes for the index and tokens.json, and hard numeric limits (≤20 MB, SVG ≤2 MB, 4,080 files / 256 MiB). It is not score 5 because several commands contain unresolved placeholders ("node <this skill's folder>/scripts/artifact.mjs") and key routes defer to prose rather than exact commands — the React-19 esbuild bundling route says to "bundle an entry that imports it as the Built route says" without giving the esbuild command line. It is not score 3 because the common cases are fully specified and copy-paste ready.

Workflow Clarity

Creating and Revising are clearly numbered sequences with explicit validation feedback loops — "Then run `check` and fix what it names until `problems` is 0" and "Then `check` until `problems` is 0" — plus ordering invariants (index LAST, uploads first, all changed files in ONE message), a checklist section, and recovery/edge-case handling for failures (NETWORK_BLOCKED → run outside the sandbox; no file tool → hand over the files; no marker → read-only, say so; comments --wait → handle, reply, restart the wait). It is not score 4 because checkpoints and error-recovery loops are present and explicit at every risky step.

Progressive Disclosure

The design is right — SKILL.md as a dense overview deferring one level deep to clearly-signaled references ("The full grammar and every reason a value drops: `format.md`", "read before writing components", "the why: `craft.md`", "a WORKED EXAMPLE: artifact-type/demo.json") — but the actual bundle contains none of them: format.md (cited 6×), from-code.md (5×), craft.md (4×), from-design-tool.md (3×), cover.md (3×), demo.json (3×) and sample-seazar-tokens.json are all absent from the skill folder (only scripts/artifact.mjs, scripts/server.mjs and scripts/editor/ exist). The deferred content — the token grammar, the component/preview contract, the cover spec, and both import routes — is therefore unreachable, which collapses the navigation the structure depends on. It is not score 3 because that anchor assumes the references actually lead somewhere; it is not score 1 because the body does stand alone for its core create/revise/check/open flows and the references it does make are clearly signaled, not buried.

Specificity

The description names multiple concrete actions — "Create and revise design systems", "as local files, then open them in a local design-system page where the user can browse and edit tokens, type, components and assets" — and comprehensively enumerates the deliverables ("project/design-system.json, tokens.json, a README brand book, component previews, fonts and asset groups") plus the sources it can be built from ("a code repository, a design tool or scratch"). This matches the anchor for multiple specific concrete actions with comprehensive coverage; it is not score 4 because coverage of its domain has no visible gaps.

Completeness

Both questions are answered explicitly: the "what" is the full first sentence (create/revise design systems in the Design System artifact format as local files, opened in an editable local page), and the "when" is an explicit "Use when the user asks for a design system or brand kit in this format, built from a code repository, a design tool or scratch, names claude-design-system or the Design System type, or wants to revise a folder that holds project/design-system.json" with concrete trigger phrases. It even adds a negative boundary ("Not for a free-form HTML style guide, UI kit or token page"); not score 4 because the "when" clause is already fully explicit and specific.

Trigger Term Quality

Good natural keyword coverage: "design system", "brand kit", "code repository", "design tool", the skill name "claude-design-system", and the concrete file marker "project/design-system.json". A few natural synonyms a user might say are missing (e.g. "design tokens", "brand guidelines", "brand book"), so it falls just short of the comprehensive-synonyms anchor; it is clearly above the anchor where only relevant-but-partial keywords are present.

Distinctiveness Conflict Risk

It carves out a clear niche — the claude.ai Design System artifact format kept as local files — with distinct triggers (the format name, the project/design-system.json marker, the skill name) and an explicit exclusion of the nearest neighbors ("Not for a free-form HTML style guide, UI kit or token page"). Conflict risk with generic styling or token skills is minimal; it is not score 4 because there is no identifiable closely-related skill it would wrongly trigger for.