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science-source-matrix

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Use when choosing which retrieval source to query, when a search returns suspiciously few results, when OpenAlex budget runs low, or when a source is rate-limited or blocked; covers per-source capability, quotas, fallback order, and how to tell "source broke" from "query too narrow".

dsh-science/skills/science/science-source-matrix/SKILL.md

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# 检索源矩阵：谁查什么、什么时候换源

## 开局先做两件事
1. `science_source_status` —— 看谁在冷却、OpenAlex 还剩多少美元预算；
2. `science_lit_query` —— 本地库有没有现成的。**同一课题不要重复烧配额**。

## 源的能力分工

| 源 | 强在哪 | 弱在哪 | 用法 |
|---|---|---|---|
| **OpenAlex** | 覆盖面最广，带引用数、OA 位置、摘要倒排索引 | **有美元预算**（无 key $0.10/天） | 首选，但一次查询别超 25 条 |
| **Crossref** | DOI 权威、元数据最规范、出版信息全 | 无摘要（部分有）、检索是相关性排序非布尔 | 补 DOI 与卷期页；查不到某篇的准确出版信息时用它 |
| **Europe PMC** | 生物医学全覆盖，**直接给 OA 全文链接** | 非生物医学覆盖弱 | 医学/生物方向第一顺位；M1.1 全文链的第 4–5 级靠它 |
| **PubMed** | 临床与生物医学索引最严（MeSH） | 两步请求、无 OA 链接 | 系统综述的纳排标准靠它；配合 Europe PMC 拿全文 |
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