Conciseness

The body is mostly tables and commands with no concept re-teaching, but 'Activation Conditions' (5 bullets) and 'When to Use This Skill' (3 bullets) duplicate each other, and the opening line 'Write reliable tests with Bun units and Rstest integrations' merely restates the frontmatter. This matches 'mostly efficient but could be tightened' rather than the minor-trim level 4.

Actionability

Concrete, executable guidance throughout: the commands block ('bun run test:unit', 'bun run test:coverage', etc.), explicit conventions ('.test.ts = Bun unit, .test.tsx / .integration.test.ts = Rstest integration'), and the specific path 'test-utils/test-utils.tsx'. Not 5 because there is no inline example of actually writing or mocking a test — that is deferred entirely to referenced files not present in this bundle.

Workflow Clarity

A clear derivable sequence exists (pick test type via the Quick Reference table, apply conventions, run the matching command) and no destructive/batch cap applies. Not 5 because 'Debugging test failures' is listed as an activation condition yet no debugging feedback loop is described, and no command for running a single test file is given.

Progressive Disclosure

References are only one level deep and gathered in a navigation table, but the five referenced files ('test-unit-vs-integration.md', 'test-mock-patterns.md', etc.) are named without paths while the Rules section vaguely says 'See rules/ directory for detailed guidance' — inconsistent signaling, and no bundle directories exist here to verify the files. This matches 'references present but not clearly signaled' rather than the mostly-clear level 4.

Specificity

Lists several concrete actions with named tools — 'Write and maintain tests', 'mock utilities', 'Zustand store testing patterns' — anchored to Bun/Rstest, matching the 'several specific actions; minor gaps in coverage' anchor. It falls short of 5 because coverage is not comprehensive (no coverage, CI, or debugging actions) and above 3 because it goes beyond 1-2 generic actions.

Completeness

The 'what' is clear (write and maintain tests with specific tooling) but there is no 'Use when...' clause or equivalent trigger guidance anywhere, which caps completeness at 3 per the judging guidelines. This matches the anchor 'Has a clear what but when is missing or only weakly implied'.

Trigger Term Quality

Contains natural terms users would say ('tests', 'mock', 'store testing') plus specific tool names (Bun, Rstest, Zustand), matching 'good keyword coverage; a few natural terms missing'. Not 5 because it omits file extensions (.test.ts) and plain phrases like 'unit tests'/'integration tests' — 'Bun units and Rstest integrations' is awkward phrasing users would not naturally say.

Distinctiveness Conflict Risk

The named stack ('Bun units and Rstest integrations', 'Zustand store testing patterns') carves a mostly distinct niche with minor overlap risk against other testing skills — the body itself defers e2e workflows to a separate skill. Not 5 because the generic 'Write and maintain tests' lead-in could collide with other testing skills absent explicit delimiters in the description.