Conciseness

The body runs ~330 lines and restates the framework multiple times — the Values/Principles table, the 'Why these four?' essay, four worked examples, and the phrasebook all re-explain principles already covered; it is mostly efficient per-section but visibly padded for a SKILL.md, so it sits at the midpoint rather than the lean 4-5.

Actionability

Concrete decision rules ('a value either lands on the ramp or it doesn't', 'codicons are 16px or 12px'), named tokens (--vscode-cornerRadius-small, --vscode-strokeThickness), an explicit spacing ramp (0,2,4,6,8,10,12,16,20,24,28,32,36,40), and a do/don't phrasebook give mostly executable guidance; it is not 5 because much guidance is evaluative phrasing rather than copy-paste-ready mechanics.

Workflow Clarity

A clear reasoning sequence is given — 'name the feeling, find the principle it breaks, then reach for the move' and the 5-step feedback order (feeling → surface → principle → move → number); it is not 5 because there are no validation/retry checkpoints, though none are strictly required for this non-destructive skill.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ absent), yet the doc inlines the full Moves mechanical toolbox and the phrasebook that could live in separate files, and its only external links (baseSizes.ts, design-tokens.instructions.md, coding-guidelines.instructions.md) point outside the bundle and cannot be verified; structure within the file is good but content is monolithic, matching the 3 anchor.

Specificity

Quotes 'reasoning about UI in design terms instead of raw pixels' and lists concrete application actions ('deciding a radius, spacing, type role, icon size, border, color, or motion', 'translating a "this feels off" observation into a concrete, principled fix'); it names several specific surfaces but the core 'what' is a shared vocabulary rather than discrete operations, so it sits just below the comprehensive 5.

Completeness

Explicitly answers both — what ('The VS Code design philosophy — a shared Values→Principles→Moves vocabulary for reasoning about UI in design terms') and when ('Use when designing, building, reviewing, or giving feedback on any visual surface; when deciding a radius, spacing, type role, icon size, border, color, or motion') — with concrete trigger phrases; it is not a 4 because the 'when' is as explicit and specific as the 'what'.

Trigger Term Quality

Natural trigger phrases a user would say appear ('designing, building, reviewing, or giving feedback on any visual surface', 'this feels off', 'radius, spacing, type role, icon size'); good keyword coverage with the colloquial 'this feels off' anchor, but a few common synonyms a designer might voice are not exhaustively listed, keeping it at 4 rather than 5.

Distinctiveness Conflict Risk

Scoped to 'VS Code design philosophy' with distinct Values→Principles→Moves triggers, giving a clear niche; it is not a 5 because the broader UI/design-feedback framing could overlap with general design or brand-skills at the margin.