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code/ui/CurrentTool.cs

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+using Sandbox;
+using Sandbox.Tools;
+using Sandbox.UI;
+using Sandbox.UI.Construct;
+
+public class CurrentTool : Panel
+{
+	public Label Title;
+	public Label Description;
+
+	public CurrentTool()
+	{
+		Title = Add.Label( "Tool", "title" );
+		Description = Add.Label( "This is a tool", "description" );
+	}
+
+	public override void Tick()
+	{
+		var tool = GetCurrentTool();
+		SetClass( "active", tool != null );
+
+		if ( tool != null )
+		{
+			Title.SetText( tool.ClassInfo.Title );
+			Description.SetText( tool.ClassInfo.Description );
+		}
+	}
+
+	BaseTool GetCurrentTool()
+	{
+		var player = Local.Pawn;
+		if ( player == null ) return null;
+
+		var inventory = player.Inventory;
+		if ( inventory == null ) return null;
+
+		if ( inventory.Active is not Tool tool ) return null;
+
+		return tool?.CurrentTool;
+	}
+}