Conciseness

Mostly efficient — no filler explaining basics Claude already knows — but the core 'lead with the feeling, not the pixel' message is restated four times (intro, 'How to read this', the Moves preamble, and the feedback section), and the ~25-line 'Why these four?' section is essayistic rationale rather than instruction. Fits 'mostly efficient but includes some unnecessary explanation or could be tightened' better than 'minor instances that could be trimmed' (4), since a 30-40% cut is achievable without losing guidance.

Actionability

Fully concrete for an instruction-only skill: named tokens (`--vscode-cornerRadius-small/medium/large/circle`, `--vscode-strokeThickness`), exact values (4/6/8px tiers, the enumerated spacing ramp, 16/12px icon sizes, 400/600 weights, `heading1-3`/`body1-2`/`label1-3` roles), a per-move decision rule, and a do/don't phrasebook covering the common cases. Every move tells the reader exactly which value to pick and how to phrase the bug.

Workflow Clarity

The diagnostic sequence is explicit and repeated consistently: 'name the feeling, find the principle, then reach for the move' (bottom-up reading), a numbered 5-step feedback order (feeling → surface → principle → move → number), five worked examples modeling the sequence end-to-end, and an explicit conflict-resolution rule for the sentence-case/title-case contradiction. There are no validation checkpoints because nothing destructive or batch is performed, so the rubric's validation cap does not apply.

Progressive Disclosure

Internal structure is good (clear sections, anchor links from principles to moves), but everything — the phrasebook table, the feedback protocol, and the worked examples — is inlined in a ~320-line single-file skill with no bundled reference files, and the only external pointers (`baseSizes.ts`, `design-tokens.instructions.md`) are repo-relative paths outside the bundle that cannot be verified from the skill itself. This fits 'some structure but content that should be separate is inline' rather than 'most content appropriately placed' (4).

Specificity

Quotes multiple specific concrete actions and decision points — 'designing, building, reviewing, or giving feedback on any visual surface', 'deciding a radius, spacing, type role, icon size, border, color, or motion', 'translating a "this feels off" observation into a concrete, principled fix' — comprehensively covering this skill's domain. Anti-drift check: this is not 'several specific actions with minor gaps' (4); the enumerated attribute decisions leave no obvious coverage hole for a design-vocabulary skill.

Completeness

Both halves are explicit: the 'what' is 'a shared Values→Principles→Moves vocabulary for reasoning about UI in design terms instead of raw pixels', and the 'when' is a full 'Use when...' clause with three concrete trigger conditions. This mirrors the anchor-5 example structure (what + 'Use when...' with concrete triggers).

Trigger Term Quality

Comprehensive natural-language coverage: users would actually say 'designing', 'reviewing', 'giving feedback', 'radius', 'spacing', 'icon size', 'border', 'color', 'motion', and especially 'this feels off' — the colloquial phrase this skill exists to handle. Synonyms are subsumed (padding → spacing, font → type role), matching the 'comprehensive coverage including synonyms' anchor better than 'a few natural terms missing' (4).

Distinctiveness Conflict Risk

Clear niche — the VS Code design philosophy — anchored by distinct triggers ('type role', 'elevation' vocabulary, 'this feels off') that no generic design, chart, or coding skill would claim. It is written in third person with no over-claims, so no specificity penalty applies.