Conciseness

The 45-line router body is lean and assumes Claude's competence: every line is a routing instruction, parameter, or a scope/quality guard (e.g., "if there are more than ~10 segments, switch to the batched long-article strategy in references/script-usage.md"), with no explanation of concepts Claude already knows. Not 4 because no section is over-explanation that could be trimmed.

Actionability

Guidance is mostly executable: it names "Prefer scripts/nature_citation.py", the concrete scope values (`Nature系列` / `CNS` / `CNS及子刊` / flagship-only) passed "as --scope", the ~10-segment batching threshold, and on-demand triggers per topic. Not 5 because the body contains no copy-paste-ready invocation (that lives in references/script-usage.md); not 3 because the directives are specific and runnable, not high-level hints or pseudocode.

Workflow Clarity

The four-step routing sequence is clear (load core, confirm scope/language inline, run the seven-step workflow, open references on demand) with several checkpoints: "State the detected scope and date limits in one short line before searching", "never cite a metadata-only candidate without checking the abstract or publisher page", and the PMID-refetch fallback for missing given names. Not 5 because a full validate→fix→retry loop is not spelled out in the body itself (the seven-step workflow and batching validation live in files that must be loaded).

Progressive Disclosure

The four references/ files are well signaled and one level deep (each maps to an explicit on-demand trigger), but step 1's always_load layer is broken against the actual bundle: "Read [manifest.yaml](manifest.yaml)" and "static/core/principles.md", "static/core/workflow.md", "static/core/chinese-mode.md" do not exist in the skill directory, so the primary navigation path fails. Not 4 because missing always_load files are more than a minor organization gap; not 2 because the references that do exist are clearly signaled rather than buried or inlined.

Specificity

The description lists several concrete actions — "Find and verify Nature/CNS-family literature supporting manuscript claims, with claim-to-source mapping and reference-manager export" — which matches the anchor for several specific actions with minor gaps. It is not 5 because secondary capabilities (author-metadata validation, review artifacts) go unmentioned, and not 3 because it names the domain plus four concrete actions, well beyond 1-2.

Completeness

It answers 'what' clearly ("Find and verify Nature/CNS-family literature supporting manuscript claims, with claim-to-source mapping and reference-manager export") and 'when' explicitly ("Use for ... when this journal scope is requested; use broader literature search for unrestricted sources"). Not 4 because the 'when' is an explicit trigger clause, not merely present-but-vague.

Trigger Term Quality

It includes natural user phrasings in two languages — "Nature系列引用、CNS支撑文献、分段补引用" alongside "Nature/CNS-family literature" and "reference-manager" — giving comprehensive synonym coverage of how users actually request this. Not 4 because it covers the common variations rather than leaving a few natural terms missing.

Distinctiveness Conflict Risk

It carves a clear niche (Nature/CNS-family citation support for manuscripts) and adds an explicit negative boundary — "use broader literature search for unrestricted sources" — that prevents triggering for generic literature-search requests. Not 4 because the overlap risk with related skills is explicitly disambiguated.