Conciseness

The body is lean and assumes competence — it gives path-mapping rules, import conventions, and commands without explaining what testing is. Only minor trimming is possible (e.g. the extended rationale in rule 3), keeping it just below fully lean.

Actionability

Guidance is mostly executable: concrete test-file path mappings for packages and projects, a real '@fastgpt' import example, an export-for-test example, and runnable 'pnpm test' commands. The soft step '思考和分析代码后编写测试样例' is the main non-executable gap.

Workflow Clarity

The three-stage flow (task preparation → parallel test writing → verification) includes an explicit validation command with a coverage check and a feedback loop back to stage 2. It misses a 5 because the coverage target contradicts itself — rule 2 demands 100% lines/branches while verification asks for 90%+ — leaving a minor checkpoint inconsistency.

Progressive Disclosure

This is a well-sectioned single-file skill with no bundle files to disclose; the repo-relative links (vitest.config.mts, test/mocks/index.ts) are one level deep and clearly signaled. At ~97 lines it exceeds the under-50-line simple-skill case, so structure is good but not maximally split.

Specificity

The only stated action is "编写单元测试" (write unit tests), which merely restates the domain; no concrete capabilities such as coverage enforcement, framework setup, or test-file placement are named, matching the 'names the domain but actions are minimal or generic' anchor.

Completeness

Both parts are explicitly present: an explicit 'when' clause ("当用户需要编写一个单元测试时") and a 'what' (write unit tests). It falls short of a 5 because the 'what' is thin — no coverage targets, framework, or scope of which files get tests.

Trigger Term Quality

"单元测试" (unit test) is a natural trigger term, but common variations users would say — 测试/test, 测试用例, 覆盖率/coverage, vitest, .test.ts — are all missing, so keyword coverage is partial rather than comprehensive.

Distinctiveness Conflict Risk

'Unit test writing' with no framework or repository context is somewhat specific but could overlap with adjacent skills (integration testing, TDD, running existing tests), so overlap risk with closely related skills remains.