Conciseness

The body is entirely operational — channel definitions, exact yarn command mappings, hard rules, and common mistakes — with no explanations of concepts Claude already knows. Every line earns its place, matching the 'lean and efficient' anchor.

Actionability

Guidance is copy-paste ready for six channel variants (e.g., `yarn test --silent --no-watchman <pattern>`), but the listed usage example `/test watch ReactFiberHooks` has no corresponding command mapping in the instructions, leaving a minor execution gap. Not 5 due to that gap; not 3 because everything shown is fully executable rather than pseudocode.

Workflow Clarity

The three-step sequence (parse channel → map to yarn command → "Report test results and any failures") is unambiguous for a single-purpose skill, and the reporting step is an explicit checkpoint. The destructive/batch cap does not apply to test execution.

Progressive Disclosure

The body is under 50 lines, single-task, needs no external reference files (none exist in the bundle), and is organized into well-labeled sections (Arguments, Usage Examples, Release Channels, Instructions, Hard Rules, Common Mistakes). Its one cross-reference ("see `feature-flags` skill") is one level deep and clearly signaled.

Specificity

The description states concrete capabilities — "run tests for React core" — and enumerates supported channels ("source, www, stable, and experimental"), which lists several specific capabilities with minor gaps (watch mode and flag handling are only in the body). It is not 5 because coverage is not comprehensive of the skill's full capability set, and not 3 because it goes beyond 1-2 bare actions.

Completeness

It explicitly answers both questions: what ("run tests for React core. Supports source, www, stable, and experimental channels") and when ("Use when you need to run tests for React core") with a concrete trigger phrase. It fits the anchor 5 example pattern of statement plus 'Use when' clause rather than the 4 anchor's weaker, less specific 'when'.

Trigger Term Quality

Natural user phrases are present ("run tests", "React core", plus the channel names users would actually type), giving good keyword coverage. It is not 5 because common synonyms and variations ("jest", "unit tests", test-file patterns) are missing, and not 3 because coverage is clearly better than 'some relevant keywords'.

Distinctiveness Conflict Risk

"React core" establishes a clear niche with distinct triggers and minimal overlap with other skills; generic test-running wording is tightly scoped by the React-core domain. Not 4, since no meaningful overlap risk with closely related skills is apparent.