Perform advanced CNKI searches with field filters such as subject, title, keyword, author, journal, year range, and source category (SCI/EI/CSSCI/北大核心/CSCD). Use when Codex needs 精确筛选知网文献、限定作者/期刊/年份/来源类别，或普通关键词检索不够准确。
Trigger authorized CNKI paper PDF or CAJ downloads from a paper detail page. Use when Codex needs 在用户已登录且有下载权限时下载知网论文、优先 PDF、必要时 CAJ，或根据论文 URL 打开详情页后触发浏览器下载。
Export CNKI citation metadata from a paper detail page or search results page, output GB/T 7714 text, save RIS/EndNote-style data, or push items to Zotero through the local Zotero Connector API. Use when Codex needs 导出知网引用、批量保存检索结果、写入 Zotero、生成 GB/T 7714 引文，或复用结果页 exportId。
Query CNKI journal indexing and evaluation data, including 北大核心, CSSCI, CSCD, SCI, EI, AMI, Scopus, ISSN/CN, sponsor, publication cycle, paper count, and impact factors. Use when Codex needs 判断期刊级别、查询是否核心/CSSCI/CSCD/EI/SCI、核对期刊收录和评价指标。
Search CNKI journal navigation by journal name, ISSN, CN number, or sponsor and return structured journal candidates. Use when Codex needs 查找知网期刊、确认 ISSN/CN、获取影响因子、主办单位、被引/下载数据，或为收录查询和期刊目录浏览定位期刊详情页。
Browse CNKI journal issues and extract a specific issue table of contents, with optional authorized original TOC PDF download. Use when Codex needs 查看某期刊某年某期目录、列出该期论文题名作者页码、打开原版目录浏览，或在用户有权限时触发目录 PDF 下载。
Navigate CNKI search result pages or change sorting order. Use when Codex needs 知网结果翻页、跳到指定页、上一页/下一页、按发表时间/被引/下载/相关度/综合排序，并继续解析新的结果页。
Extract full metadata from a CNKI paper detail page, including title, authors, affiliations, abstract, keywords, fund, classification, source, publication info, and citation network counts. Use when Codex needs 查看某篇知网论文详情、整理摘要关键词、引用前核对元数据，或从搜索结果 URL 进入详情页解析。