Conciseness

The body is mostly task-relevant and does not explain concepts Claude already knows, but it is noticeably heavy: a ~185-line full BRD template is inlined inline (including fully populated boilerplate rows like the RACI matrix, resource table, and milestone table with placeholder dates), and the workflow is stated twice (ASCII flow diagram plus the step sections). This fits the 3 anchor ("mostly efficient but... could be tightened") rather than 2, since nearly all content is skill-specific rather than filler, and rather than 4 because the template's boilerplate rows add real token cost without instruction value.

Actionability

Guidance is highly concrete for an instruction-only skill: exact file-naming conventions ("[product-name-en]-brd.md", "[product-name]-architecture.svg"), a concrete SVG tech spec (viewBox, font stack, hex palette), a full copy-paste-ready BRD template, and specific search-keyword formats ("[产品领域] market size"). It stops short of 5 only because the two mandatory SVG charts — a core deliverable — get a style spec but no example markup or structural skeleton to anchor generation.

Workflow Clarity

The four-step sequence is clear, ordered, and visualized in an overview diagram, and the "写作质量标准" checklists function as post-generation validation checkpoints (e.g., verifying SVGs are saved as files and referenced correctly). It does not reach 5 because the checklists lack an explicit feedback loop — nothing instructs re-checking or fixing output when a checklist item fails — leaving checkpoints implicit rather than enforced.

Progressive Disclosure

The body has good section structure (workflow, steps, template, quality checks, scenarios, triggers), but it is a monolithic SKILL.md with no reference files: the full BRD template, the SVG chart specifications, and the special-scenario handling are all inlined when the template in particular clearly belongs in a separate references/ file. This matches the 3 anchor ("some structure... content that should be separate is inline") rather than 2, because organization and navigation within the file are solid.

Specificity

The description lists several concrete actions — "自动生成图文并茂、结构完整的 BRD", "以 Markdown 格式保存到当前项目 markdown/ 目录", "同时输出配套 SVG 图表文件" — with specific output formats and destinations. It falls just short of the 5 anchor because phrases like "图文并茂、结构完整" are mildly padded, and it stays at 4 rather than 3 because the actions named are specific and together cover the skill's full behavior.

Completeness

Both questions are answered explicitly: the "what" is stated up front (generate a complete BRD in Markdown with companion SVG charts to the markdown/ directory), and the "when" is given via a dedicated "触发条件：" clause with concrete trigger phrases and an explicit instruction to fire even on a one-sentence idea. Not 4 because the trigger guidance is already fully explicit, not merely adequate.

Trigger Term Quality

Trigger coverage is comprehensive and natural, including synonyms and variations users would actually say: "写 BRD", "帮我写需求文档", "生成 BRD", "我有个产品想法", "帮我把这个 idea 写成文档", "PRD/BRD 模板", "产品立项文档", plus an edge-case example "我想做一个 XX 产品". This matches the 5 anchor's requirement of natural terms including synonyms; nothing common appears missing.

Distinctiveness Conflict Risk

BRD generation is a clear niche with distinct, product-document-specific triggers ("产品立项文档", "写商业需求文档"), so conflict risk is low — matching the 4 anchor of "mostly distinct; minor overlap risk". It does not reach 5 because broader phrases like "帮我把这个 idea 写成文档" and the inclusion of "PRD" could bleed into generic document-writing or PRD skills.