Its UI is also so clean, reminds me of Apollo

Nice job! I’d add that the target of the Rustdoc link shortcuts can be customized, in case they are not autodetected or point to an undesired location, like so:

/// Use a [Tool]
///
/// [Tool]: lib::types::Tool

That will make the word Tool point to that type (note that the namespaces there - in lib::types::Tool - are relative to the current module / context, so you can use an imported name directly there too, for example).