Conciseness

The ~60-line body is lean and imperative throughout — no concept explanations, no padding — and every line carries task-specific guidance ('~240–280px wide' frames, 'Inter / system-ui... IBM Plex Mono', 'One sentence before the artifact, nothing after'). It assumes Claude's competence and every token earns its place.

Actionability

For an instruction-only skill the guidance is fully concrete and executable: exact board structure (header with 'WIREFRAME v0.1 · MOBILE' tag, phone row, connectors, 1–2 annotations), specified fonts, grey-box content inventory per screen type, single-HTML constraints (inline CSS, no external JS/images, data-od-id placement), and a copy-ready artifact output contract with tag format.

Workflow Clarity

A clear 5-step sequence (pick flow steps → lay out board → write single HTML → self-check) with an explicit validation checkpoint step and a corrective feedback loop ('If a screen renders blank as a thumbnail, raise the contrast'). The operation is non-destructive, so no batch/destructive cap applies.

Progressive Disclosure

The skill is self-contained — no references/, scripts/, or assets/ bundle exists and none is needed — and the body is short, single-purpose, and cleanly sectioned (intro, Workflow, Output contract). Per the simple-skill guidance, well-organized sections with no need for external references score 5.

Specificity

The description lists multiple concrete, specific deliverable elements — 'three or four phone frames laid out in a row on a board', 'Grey-box content inside each device, dashed connector arrows + numbered step labels between screens, and a couple of annotation callouts' — in third-person voice, fully matching the 'multiple specific concrete actions; comprehensive coverage' anchor.

Completeness

Both questions are explicitly answered: the 'what' is a lo-fi multi-screen mobile flow wireframe board with connectors and annotations, and the 'when' is an explicit trigger clause ('Use when the brief asks for...') with concrete trigger phrases.

Trigger Term Quality

The 'Use when' clause gives comprehensive natural-term coverage with synonyms across languages: 'mobile wireframe', 'app flow', 'user flow wireframe', 'lo-fi mobile', 'low fidelity', plus the Chinese equivalents '线框图', '移动端线框', 'App 流程'.

Distinctiveness Conflict Risk

The lo-fi mobile flow wireframe niche is clear with distinctive triggers (numbered flow, grey-box, callouts), but terms like 'low fidelity' and 'app flow' carry minor overlap risk with generic wireframe, flowchart, or screen-design skills — fitting the 'mostly distinct; minor overlap risk' anchor rather than the 'minimal conflict risk' anchor.