What problem does it solve? Adding defensible citations to a manuscript requires splitting text into citable claims, searching the right journals, verifying that each paper actually supports the claim, and formatting references for a citation manager. This Skill automates that pipeline while restricting results to Nature Portfolio, the Science family, and Cell Press journals. ## Core Features & Use Cases - Claim segmentation and search: Splits passages into stable claim units (S001, S002...), builds English search queries, and queries Crossref and PubMed with journal-scope and date filters. - Conservative support grading: Labels each candidate as strong, partial, background, limiting, or metadata-only support, and never cites a paper without checking its abstract or publisher page. - Reference-manager export: Exports RIS by default, plus ENW and Zotero RDF, with an author-integrity gate that blocks surname-only or incomplete author metadata and refetches records by PMID. - Use Case: Paste an introduction paragraph and ask for Nature-series citations from the last five years; receive a segment-to-reference mapping table, an interactive HTML browser for filtering candidates, and a Zotero- or EndNote-ready RIS file. ## Quick Start Use the nature-citation skill to split this manuscript paragraph into claims and find supporting Nature, Science, or Cell references, then export them as a RIS file.