LanguageTool: checkchecks the current buffer
LanguageTool: suggestshows suggestions if curser is on an error
LanguageTool: clearclears all errors
This package only checks text when asked to do so. Additionally, the linter package does not provide a way to choose from multiple suggestions, as e.g. spell-check does.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.