文献检索与筛选规范。当用户要求围绕某个课题检索学术文献、做系统综述检索、制定纳入/排除标准、或把候选文献筛选成最终清单时使用。按深度分档（快筛/标准/严格检索）执行，检索过程全程留痕可复现。严格检索档不等于完整系统综述。产出 papers/screening.md、papers/included.md、papers/included.json、papers/to-fetch.md、papers/to-fetch.ris、papers/endnote-import.ris。
Install
npx skills add hongtongzhou-design/ccode --skill lit-searchnpx skills add hongtongzhou-design/ccode --skill lit-search -a claude-code -gnpx skills add hongtongzhou-design/ccode --skill lit-search -a codex -ggemini skills install https://github.com/hongtongzhou-design/ccode.git --path src-tauri/resources/skills/lit-searchgh skill install hongtongzhou-design/ccode lit-searchgit clone --depth 1 https://github.com/hongtongzhou-design/ccode /tmp/hongtongzhou-design__ccode
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/hongtongzhou-design__ccode/src-tauri/resources/skills/lit-search ~/.claude/skills/lit-search # Claude Code
cp -R /tmp/hongtongzhou-design__ccode/src-tauri/resources/skills/lit-search ~/.agents/skills/lit-search # Codex, Cursor, Gemini CLI, Copilot, OpenCode