Conciseness

Dense and operational almost everywhere — decision table, fallback matrix, preflight, and copy-paste commands with no padding and no explanation of concepts Claude already knows. Falls short of the 5 anchor due to minor trims available: repeated path-independence caveats ("don't hardcode a home path — the skill may live under ~/.claude/skills/..." plus the parenthetical "or: cd into this skill dir"), and the tail block on setup.sh's whitespace re-serialization of ~/.claude.json spends tokens on an ancillary edge case. Well above 3's 'some unnecessary explanation'.

Actionability

Mostly copy-paste ready: `pdf2md paper.pdf out/ -m ocr`, `bash scripts/batch-local.sh ~/papers ~/papers_md`, exact token names, URLs, and concrete limits (≤20p/10MB) plus natural-language MCP prompts. Not the 5 anchor because the two path-independent invocation snippets are broken as written — `bash "$(dirname "$0")/scripts/check.sh"` resolves to the caller's cwd, not the skill dir, and `cd "$(dirname SKILL.md)"` is a no-op (dirname of a bare filename is '.') — so the working alternative has to be inferred from the comment, and the Setup section's `bash setup.sh` has no corresponding file in the bundle.

Workflow Clarity

Clear sequencing (decision table → fallback → preflight → usage → setup) with a real validation checkpoint (run check.sh before token-gated tools, "do not silently fail") and an error-recovery loop ("A parse fails or returns garbage on one path → retry the same file on the other path before giving up; report which path"). Falls short of 5 because batch workflows (batch-local.sh, cloud batch prompts) end with no post-run verification step — nothing says to check outputs exist/are non-empty before reporting success — a minor validation gap rather than the 3-cap, since preflight validation and failure-recovery loops are present.

Progressive Disclosure

The in-body structure is good and the reference is clearly signaled ("Deep detail lives in `reference.md`; read it when you need backends, REST endpoints, or disk/uninstall info"), but scoring against the actual bundle: `reference.md` does not exist anywhere in the skill, and `setup.sh` — the core command of the Setup section — is also missing, while only `scripts/batch-local.sh` and `scripts/check.sh` resolve. The one-level-deep reference design that justifies keeping SKILL.md lean dead-ends, so the split is half-implemented — more than the 4 anchor's 'minor organization gaps' and worse navigation than the 5 anchor requires.

Specificity

Concrete actions with comprehensive coverage across all three capabilities: "parse/convert a PDF, image, Word, PPT, or Excel into Markdown/JSON", "search scientific papers / literature", and "bootstrap this toolchain on a new device", including what's handled ("formulas, tables, or scanned/multi-column layout"). It clearly matches the 5 anchor ("multiple specific concrete actions; comprehensive coverage") rather than 4, which would require minor gaps in coverage of the skill's capabilities.

Completeness

Explicitly answers both questions: what ("High-fidelity academic document parsing (MinerU) + scientific literature retrieval (SciVerse), with one-command setup") and when ("Use when the user wants to parse/convert a PDF... to search scientific papers / literature... or to bootstrap this toolchain"), each with concrete trigger phrases. Matches the 5 anchor exactly; 4 would require the 'when' to be less explicit or specific.

Trigger Term Quality

Extensive natural trigger phrases a user would actually say, in both English and Chinese: "PDF转markdown", "提取论文内容", "公式转LaTeX", "mineru", "pdf2md", "文献检索", "找论文", "semantic search papers", "配置文档解析环境". Coverage — synonyms, tool names, task phrasings, and named formats (Word, PPT, Excel) — exceeds the 5-anchor example; the only nit is no literal file extensions like ".pdf", which keeps it at 5 rather than being a real gap since formats are named in words.

Distinctiveness Conflict Risk

Clear niche (academic/high-fidelity parsing + literature search) with distinct tool-name triggers, and it actively resolves the one overlap risk: "For generic PDF ops (merge, split, rotate, fill forms, plain text extract) prefer the built-in `pdf` skill." The explicit boundary guidance means minimal conflict risk, matching the 5 anchor rather than 4's 'minor overlap risk'.