Conciseness

Most content earns its place (readiness conditions, pitfalls, exact tool names), but "Adapting Existing Components for Fixtures" and "Writing Fixture-Friendly Components" substantially duplicate each other — CSS decoupling, DI, auto-focus options, and exposing domNode are each explained twice with before/after examples. This is 'mostly efficient but could be tightened' rather than level 2, since little of the material explains concepts Claude already knows.

Actionability

Fully executable guidance throughout: exact file paths and glob patterns, named MCP tools (mcp_component-exp_list_fixtures, mcp_component-exp_screenshot), copy-paste TypeScript patterns, a utilities table with per-export purposes, and a referenced real example (sessionsListFixtureUtils.ts). Specific examples cover the common cases (basic group, variants, mocks, icon themes).

Workflow Clarity

The run-locally steps are numbered with concrete tool calls, and validation is taken seriously (bounded condition-based waits that throw, hash comparison at the CI readiness boundary, folder-level preview for mount-order races). It falls short of level 5 because the end-to-end fixture workflow (write → render → screenshot → validate) is never presented as one sequence; the reader assembles it from separate sections.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), so ~400 lines of content load as one monolithic document. Section headers, an anchored cross-link, and the utilities table give it real structure, but content that plausibly belongs in reference files (the component-adaptation patterns, the Learnings section, the full pre-registered service list) is inlined — matching the level-3 anchor of 'some structure but could be better organized'.

Specificity

The description lists concrete actions ("creating or updating component fixtures", "designing UI components to be fixture-friendly") and comprehensively enumerates coverage areas ("fixture file structure, theming, service setup, CSS scoping, async rendering, validation, and common pitfalls"). Multiple specific capabilities with comprehensive coverage; it is not the level-4 anchor because there are no meaningful coverage gaps.

Completeness

Both what ("Covers fixture file structure, theming, service setup, CSS scoping, async rendering, validation, and common pitfalls") and when ("Use when creating or updating component fixtures... or when designing UI components to be fixture-friendly") are explicitly and concretely answered with three distinct trigger scenarios. Matches the level-5 anchor; level 4 would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

Natural domain terms are present ("component fixtures", "screenshot testing", "UI components", "fixture-friendly"), which users in this domain would actually say. It falls short of the level-5 anchor because common variations like "screenshot tests", "visual testing", or "component explorer" are missing.

Distinctiveness Conflict Risk

"Component fixtures" plus "screenshot testing" defines a clear niche with distinct triggers; minimal risk of firing for unrelated skills. It does not sit between anchors — the trigger terms are specific enough to avoid the overlap described at level 4.