Research Paper & DOI Lookup (Crossref)

There is only one tool, so there is no possibility of confusion or misselection between tools. Its purpose is clearly stated as a single lookup operation for DOI resolution and keyword/author/title search.

With a single tool named paper_lookup, there is no convention to violate. The name follows a readable snake_case pattern and clearly describes the action on a paper resource.

A single tool is thin for a server, even though the description indicates it handles both DOI resolution and keyword search. The count is borderline: focused but potentially limiting if future operations like citation formatting or abstract retrieval are needed.

The tool covers the core lookup workflows: DOI verification and searching by keywords, author, or title with filters. It returns rich metadata, but abstracts are explicitly excluded and there is no separate operation for bulk lookup or citation formatting, which are minor gaps.