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    "description": "Search research papers across Crossref, arXiv and PubMed (plus OpenAlex) in one run. Titles, authors, abstracts, DOIs, citation counts, journals and PDF links, merged and de-duplicated. For literature reviews, RAG and research.",
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          },
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            "type": "string",
            "description": "Crossref gives faster, more reliable service to requests that include a contact email (their 'polite pool'). Not stored or used for anything else."
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