Conciseness

The body is pure instruction — 'Analyze the file to understand what to test' is a single line, the three templates are tight, and no testing concepts Claude already knows are explained. Every section earns its place.

Actionability

Three near-complete executable templates plus the concrete convention 'Create the test in `__tests__/original-name.spec.ts`' and run commands. Not 5 because the component template contains a literal placeholder (`inputs: { /* ... */ }`), the service test never asserts response data or calls httpMock.verify(), and 'Run: `ng test --watch=false` or `npx vitest run`' leaves the runner ambiguous (the adapter template imports from 'vitest' while the service uses Angular TestBed).

Workflow Clarity

A clear 4-step sequence (analyze, determine type, create, run) is present, but the only checkpoint is the final run command with no guidance on verifying tests pass or fixing failures — matching 'Steps listed but validation gaps; checkpoints missing or implicit'. Not 4 because there is no explicit pass/fail checkpoint or error-recovery step; test creation is neither destructive nor batch, so no additional cap applies.

Progressive Disclosure

A well-organized single-file skill: clear '## Steps' structure with one subsection per test type, no buried references, and nothing that clearly belongs in a separate file. Not 5 because at roughly 71 lines with three full templates it sits above the lean inline-only size where the top anchor's optimal structure applies.

Specificity

'creates tests for adapters, services, and components' names the domain and one concrete action with concrete targets, matching 'Names domain and 1-2 concrete actions, but not comprehensive'. Not 4 because it lists a single action rather than several specific actions; not 2 because the action and targets are concrete, not generic.

Completeness

Both parts are explicit: what ('creates tests for adapters, services, and components') and when ('Use when a module needs test coverage'). Not 5 because the when-clause is a single trigger condition without additional concrete trigger phrasings; not 3 because neither part is missing or merely implied.

Trigger Term Quality

'Use when a module needs test coverage' supplies the natural phrase 'test coverage', but common variations users would actually say — 'write tests', 'unit tests', 'add tests', 'specs' — are missing, matching 'Some relevant keywords but missing common variations or synonyms'.

Distinctiveness Conflict Risk

'adapters, services, and components' ties the skill to a specific frontend architecture, but the trigger 'a module needs test coverage' is broad and would overlap with any general test-writing skill, matching 'Somewhat specific but could still overlap with similar skills'.