Conciseness

Prose is lean and there is no concept-explaining padding, but large sections catalog textbook React knowledge Claude already has (error boundaries, controlled forms, focus management, render props, standard memoization) with little that is non-obvious beyond a few gems (the useQuery refs note, 'copy before sorting — sort mutates in place'). Mostly efficient, but hundreds of lines could be trimmed — matching anchor 3 rather than 4, since whole sections add little beyond Claude's baseline knowledge.

Actionability

The examples are near-copy-paste-ready, complete TypeScript with usage snippets across components, hooks, state, forms, animation, and a11y. Minor gaps keep it from 5: the Dropdown keyboard example ends at '{/* Dropdown implementation */}' and the form elides '{/* Other fields */}', plus the CreateMarketForm's try/catch is 'Success handling'/'Error handling' placeholders rather than concrete guidance.

Workflow Clarity

This is a pattern catalog, not a sequenced process: the 'When to Activate' section gives selection triggers and sections are well-grouped, but there is no workflow, ordering, or validation checkpoints (e.g., 'how to choose between Context and Zustand', or verifying a memoization actually improved renders). Not a risky/destructive skill, so no cap applies; it lands at anchor 3 — useful structure present, but guidance for moving from trigger to chosen pattern is implicit.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent) and ~650 lines are inlined in SKILL.md with good section headers. That matches anchor 3: some structure, but content that would clearly work better as separate reference files (per-topic pattern pages) is inline. It avoids anchor 2 because the sectioning and headings do provide usable structure and navigation.

Specificity

The description lists several specific coverage areas — "React, Next.js, state management, performance optimization, and UI best practices" — but these are topic areas rather than concrete actions (compare "Extract text and tables from PDF files"), leaving minor gaps. It sits above score 3 (only 1-2 concrete actions) but the generic phrase 'UI best practices' keeps it below the comprehensive, action-oriented anchor 5.

Completeness

Both parts are explicitly answered: the 'what' ("Frontend development patterns for React, Next.js, state management, performance optimization, and UI best practices") and a concrete 'when' ("Use when building or reviewing React or Next.js components, state, or render performance"). This matches anchor 5's pattern of a clear what plus an explicit, trigger-phrase-bearing when clause; anchor 4's weaker example ('Use when working with PDF files') is noticeably less specific.

Trigger Term Quality

Natural trigger phrases users would say are present: "React or Next.js components", "state", "render performance", "building or reviewing". Coverage is good but misses common synonyms and variations a user might say (e.g., 'hooks', 'frontend', 'web UI', 'App Router'), so it falls between anchors 4 and 5, closer to 4.

Distinctiveness Conflict Risk

The React/Next.js scoping and the building/reviewing trigger make it mostly distinct with minor overlap risk against closely related skills (general web development, testing, or framework-specific tooling skills). It does not fully claim a niche with minimal conflict the way the PDF-example anchor 5 does.