Conciseness

There is no padding that explains concepts Claude already knows — every section is domain-specific policy — but the body repeats itself: the scope exclusion ("研究目标、技术路线…不属于本 Skill") appears in 目标, 执行步骤 3, and 专属约束; backup/rollback rules are stated in 输出管理, 校验, and 失败与恢复; and long multi-clause sentences stack overlapping conditions that could be split. It is not 4 because the redundancy is more than minor instances, and not 2 because there are no irrelevant explanations or padded sections.

Actionability

Concrete, executable guidance throughout: exact commands (`python skills/nsfc-justification-writer/scripts/run.py validate-config`, `preview --dry-run`, `rollback --project-root <项目目录> --run-id <run_id> --yes`, the test script invocation), real file paths, specific flags, and quantified rules (研究意义 2–3 段、15%–25%). It is not 5 because full invocation syntax for `preview`/`diagnose` is only implied (subcommand shown without the complete command line) and no worked example of a diff or output is included.

Workflow Clarity

A six-step numbered sequence is followed by a dedicated 校验 section with runnable checks (validate-config → diagnose → preview --dry-run) and a 失败与恢复 section that enumerates failure modes with explicit recovery loops: reject write → fix → re-run preview; backup before every write; list-runs → rollback --yes for undo. Since writes modify user files, validation is present and explicit, so the missing-validation cap does not apply. It is not 4 because checkpoints and error-recovery feedback loops are explicit per failure mode, not merely present.

Progressive Disclosure

Three references — [分节写法](references/section_writing.md), [质量控制](references/quality_control.md), [回归样例](references/regression_examples.md) — are one level deep, all verified to exist, and each is linked at its point of need with explicit load timing ("先按需读取…规划", "完成正文后读取…复核", "需要回归对照时读取"). The split is appropriate: the body holds orchestration and safety policy while the references hold the domain detail. It is not 4 because signaling, depth, and placement all match the top anchor with no buried or nested references.

Specificity

The description lists four concrete actions on a precisely defined artifact — "写作、重构、审查或润色 NSFC/科研基金申请书的立项依据" (write, restructure, review, or polish the justification section of NSFC/grant applications) — comprehensively covering that section's lifecycle. It is not 4 because the action coverage of the target artifact is complete rather than having minor gaps, and the explicit exclusion ("不负责研究目标、技术路线或其他章节") further sharpens it.

Completeness

The 'when' is explicit and strong ("当用户要求…时使用") and the 'what' is conveyed by the four action verbs plus a clear out-of-scope boundary. It is not 5 because the 'what' is folded into the when-clause rather than stated as a standalone capability sentence (e.g. what the skill actually produces for the section); it is not 3 because the 'when' is explicit with concrete trigger phrasing, not merely implied.

Trigger Term Quality

Natural trigger terms are present: "NSFC", "科研基金申请书", "立项依据", and the four action verbs users would actually say when requesting this work. It is not 5 because common colloquial variants are missing — e.g. "国自然" (the standard informal name for NSFC), "标书", "基金本子", or proposal file extensions — and not 3 because coverage goes beyond 'some relevant keywords' to the natural phrasing of the request.

Distinctiveness Conflict Risk

A clear niche — only the 立项依据 (justification) section of NSFC/grant applications — with an explicit exclusion of "研究目标、技术路线或其他章节", making accidental triggering of adjacent grant-writing or general-editing skills unlikely. Neighboring anchor 4 ('minor overlap risk with closely related skills') is a worse fit since the boundary to those closely related skills is stated explicitly.