What this developer tool does
Validate a Git tag name and, when requested, check whether it follows a semantic-version pattern. The page separates Git ref errors from release-naming conventions, which helps when a tag is technically legal but does not match an automated release workflow.
Applies Git check-ref-format restrictions, then optionally parses a v-prefixed Semantic Version 2.0.0 label.
Annotated and lightweight tags use the same ref-name restrictions. This check does not inspect whether the tag already exists.