Conciseness

Every bullet is a rule that names exact modules and functions ("src/hints.rs", "ui/hint_line.rs draw, draw_clipped, line, spans, styled", "list_nav::digit"), with zero padding and no explanation of concepts Claude already knows — Ratatui itself is never introduced. Nothing here could be trimmed without losing a real constraint, matching the lean-and-efficient anchor.

Actionability

For an instruction-only skill the guidance is maximally concrete: named helpers with their contracts ("step(down, len, wrap, selectable)"), enumerated per-screen cases ("/model and /thinking: Enter or s; /resume: Enter or d; /mcp: Enter, d or e"), and guard tests that enforce the rules ("tests/units/color_literals.rs"). The enumerated common cases leave no gap between rule and execution, so it sits at the top anchor rather than 4.

Workflow Clarity

The rules themselves are unambiguous (the single-action exception applies to each rule), and the Verification section supplies explicit validation checkpoints: update affected client-e2e scenarios, regenerate goldens, and extend the named unit tests when a helper changes. It also includes error-recovery guidance ("Do not add exemptions to make it pass: move the color into src/ui/theme/"), fitting the explicit-validation anchor rather than the minor-gaps anchor at 4.

Progressive Disclosure

The body is a compact set of well-organized sections with details correctly delegated one level deep to clearly signaled repo files ("Local code rules, scenarios and goldens live in vibe/cli-rust/AGENTS.md and client-e2e/AGENTS.md", repeated in Verification). No nesting beyond one level, no inlined material that belongs elsewhere, and easy navigation across the eight sections.

Specificity

The description lists many concrete covered areas ("any screen, list, picker, footer hint, keyboard shortcut, list navigation, scrolling or mouse clicks, back/close behavior, search field, selection highlight, color, or onboarding/dialog copy") that comprehensively mirror every section of the skill body. It is not a 4 because there are no coverage gaps relative to what the skill actually contains.

Completeness

It explicitly answers both questions: what ("Ratatui UI conventions for the Mistral Vibe Rust CLI (vibe/cli-rust)") and when ("Use when adding or changing any screen, list, picker, footer hint, ..."), with a full list of concrete trigger phrases. Both what and when are explicit, so this is clearly the top anchor rather than 4.

Trigger Term Quality

Natural phrases a user would say during TUI work appear throughout: "keyboard shortcut", "scrolling", "mouse clicks", "search field", "selection highlight", "list navigation", "back/close behavior", "color". Coverage of natural terms for this domain is essentially exhaustive, matching the anchor for comprehensive keyword coverage.

Distinctiveness Conflict Risk

The description is pinned to a specific product, framework (Ratatui), and repository path (vibe/cli-rust), giving it a clear niche with distinct triggers and minimal risk of firing for the wrong skill.