Conciseness

The body assumes Claude's competence (no explanations of git or PostgreSQL basics) but repeats the same rules in multiple places: 'Do not analyze code diffs' appears in Goal, step 5, and Quality Rules ('Do not include code diffs'); example verification appears in both step 6 and 'Do not write SQL or command examples from memory alone'; the Goal section largely restates the workflow that follows. This fits 'mostly efficient but includes some unnecessary explanation or could be tightened' rather than 4, where redundancy would be minor.

Actionability

Fully executable throughout: a concrete collector invocation ('python3 .../scripts/collect_pg_commits.py commitid1 commitid2 --output markdown/postgres-commit-range.json'), exact git commands ('git rev-parse --verify <commitid1>^{commit}', 'git log --reverse --format=%h%x09%an... --date=short <older>^..<newer>'), specific evidence paths (src/test/regress/sql/, doc/src/sgml/), and complete output templates. Matches the copy-paste-ready anchor with common cases covered.

Workflow Clarity

A clear 7-step sequence with explicit validation checkpoints and feedback loops: verify the checkout looks like PostgreSQL (step 1), 'If the order is unclear, test both ancestry directions... otherwise ask for clarification' (Inputs), an early no-article exit (step 3), and evidence verification before any example is written with a fallback ('If tests/docs/source do not provide enough confidence, do not fabricate a runnable SQL example'). Checklists (落地清单) are built into the required output. Matches the 5 anchor.

Progressive Disclosure

Good structure: sections are clearly headed, and the single bundle file (scripts/collect_pg_commits.py, verified present) is referenced with an explicit path and a description of what its JSON contains. Not 5 because ~60 lines of inlined output templates (Required Article Structure, Article Outline, No-Article Output) could live in a references/ file, keeping SKILL.md a leaner overview.

Specificity

Lists multiple concrete actions — 'Analyze PostgreSQL git commit history between two commit ids', 'write a Chinese Markdown article', 'examples checked against SQL tests, docs, or relevant source', 'group related commits, exclude reverted commits', 'return a no-article analysis' — covering analysis, authoring, verification, and fallback comprehensively. It is not score 4 because coverage has no minor gaps; every capability of the skill is named.

Completeness

Both parts are explicit: the 'what' ('Analyze PostgreSQL git commit history... write a Chinese Markdown article... with examples checked against SQL tests, docs, or relevant source') and a concrete 'when' ('Use when the user is inside a PostgreSQL source checkout and provides two commit ids, asks to interpret Postgres commits...'). Matches the 5 anchor exactly.

Trigger Term Quality

Natural user phrasings are well covered: 'interpret Postgres commits', 'summarize a release/development window', 'provides two commit ids', 'commit logs', 'reverted commits'. Not 5 because a few common variations users would say — 'git log', 'changelog', 'release notes', 'PG' — are absent.

Distinctiveness Conflict Risk

A clear niche — PostgreSQL commit-range analysis producing a Chinese WeChat article for DBAs/developers — with distinct triggers ('two commit ids', 'Postgres commits') that would rarely fire for another skill. Not 4 because there is no meaningful overlap with closely related skills.