Fetch Paper

Resolves one DOI or arXiv ID to a legal open-access copy (PDF URL, arXiv HTML rendering, landing page) and optionally downloads it for transient reading. This is the fetch layer that find-papers, literature-review, study-exemplars, and draft-related-work build on.

When to use

• The user has a DOI, doi.org URL, arXiv ID, or arxiv.org URL and wants the paper.
• Another skill needs full text for a paper it found (lit review, exemplar study).
• The user asks "is there an open-access version of this paper?"
• NOT for topic/title/venue search — run find-papers first to get the identifier.

Inputs