Conciseness

The body is dense, procedural Chinese with zero padding — no explanation of concepts Claude already knows, every step operational (discovery rules for the book directory, the three-layer prompt formula, the single authoritative template). It assumes Claude's competence throughout, matching the 'every token earns its place' anchor.

Actionability

It provides a complete, copy-paste-ready prompt template and a fully executable bash export script with error handling ('[ -f "$SRC" ] || ... exit 1'), tool fallbacks (magick/convert/sips), and explicit versioning rules (封面_vN.png, .prompt.txt). The Codex path gives concrete tool invocation instructions; the API path delegates to the reference file, which contains the full commands.

Workflow Clarity

A clear six-step sequence with explicit validation checkpoints: Step 4 requires confirming the image is readable, Step 5 checks file existence and fails fast with a message, and Step 6 is a five-item quality checklist table with an explicit retry loop ('未达标或作者希望调整时…改完重新生成一张'). This matches the anchor-5 validate-fix-retry pattern; this is not a destructive/batch operation, so no cap applies.

Progressive Disclosure

The body is a well-organized overview with exactly two one-level-deep references, each clearly signaled both inline at point of use and in a closing '参考资料' table with a '何时读' (when to read) column. Both referenced files exist and contain the sections cited (「风格库」「平台风格」「构图变体」「题材推断规则」 all present in cover-styles.md), and the split is appropriate — 11KB of style data and the API fallback correctly live outside the body.

Specificity

The description names the domain and several concrete actions: '根据书名、作者名自动分析题材风格，调用 GPT-Image-2 生成含标题和署名的专业级网文封面' plus routing guidance (prefer Codex built-in ImageGen, no separate API key). It lists several specific actions with only minor gaps (e.g., platform sizing/export is not mentioned), matching the anchor-4 example better than the 1-2-action anchor 3.

Completeness

It explicitly answers both what ('自动分析题材风格...生成含标题和署名的专业级网文封面') and when ('触发方式：/story-cover、/封面、「帮我做个封面」...'), listing concrete trigger phrases — a direct match for the anchor-5 example. Not anchor 4, because the 'when' is explicit and specific rather than improvable.

Trigger Term Quality

It includes natural phrases users would actually say: 「帮我做个封面」「生成封面图」「做个小说封面」「封面设计」, plus slash triggers /story-cover and /封面. Coverage is good but a few natural variants are missing (e.g., 「换封面」「封面图」 standalone), which fits anchor 4 rather than the comprehensive anchor 5.

Distinctiveness Conflict Risk

It carves a clear niche (Chinese web-novel covers with title and author signature) with distinct triggers. Minor overlap risk remains with a generic image-generation or cover-design skill (e.g., a user asking for a non-novel 「封面设计」), so anchor 4 fits better than the minimal-conflict anchor 5.