diff --git a/CliFx/Formatting/HelpConsoleFormatter.cs b/CliFx/Formatting/HelpConsoleFormatter.cs
index 16aaf92..9a4b6e8 100644
--- a/CliFx/Formatting/HelpConsoleFormatter.cs
+++ b/CliFx/Formatting/HelpConsoleFormatter.cs
@@ -308,7 +308,8 @@ internal class HelpConsoleFormatter(ConsoleWriter consoleWriter, HelpContext con
     private void WriteDefaultValue(InputSchema schema)
     {
         var defaultValue = context.CommandDefaultValues.GetValueOrDefault(schema);
-        if (defaultValue is null) return;
+        if (defaultValue is null)
+            return;
 
         // Non-Scalar
         if (defaultValue is not string && defaultValue is IEnumerable defaultValues)
diff --git a/CliFx/Input/CommandInput.cs b/CliFx/Input/CommandInput.cs
index 796515d..63a98fb 100644
--- a/CliFx/Input/CommandInput.cs
+++ b/CliFx/Input/CommandInput.cs
@@ -6,7 +6,7 @@ using CliFx.Utils.Extensions;
 namespace CliFx.Input;
 
 /// <summary>
-/// Describes input for a command.
+/// Input provided by the user for a command.
 /// </summary>
 public partial class CommandInput(
     string? commandName,
@@ -16,29 +16,38 @@ public partial class CommandInput(
     IReadOnlyList<EnvironmentVariableInput> environmentVariables
 )
 {
+    /// <summary>
+    /// Name of the requested command.
+    /// </summary>
     public string? CommandName { get; } = commandName;
 
+    /// <summary>
+    /// Provided directives.
+    /// </summary>
     public IReadOnlyList<DirectiveInput> Directives { get; } = directives;
 
+    /// <summary>
+    /// Provided parameters.
+    /// </summary>
     public IReadOnlyList<ParameterInput> Parameters { get; } = parameters;
 
+    /// <summary>
+    /// Provided options.
+    /// </summary>
     public IReadOnlyList<OptionInput> Options { get; } = options;
 
+    /// <summary>
+    /// Provided environment variables.
+    /// </summary>
     public IReadOnlyList<EnvironmentVariableInput> EnvironmentVariables { get; } =
         environmentVariables;
 
-    public bool HasArguments =>
-        !string.IsNullOrWhiteSpace(CommandName)
-        || Directives.Any()
-        || Parameters.Any()
-        || Options.Any();
+    internal bool IsDebugDirectiveSpecified => Directives.Any(d => d.IsDebugDirective);
 
-    public bool IsDebugDirectiveSpecified => Directives.Any(d => d.IsDebugDirective);
-
-    public bool IsPreviewDirectiveSpecified => Directives.Any(d => d.IsPreviewDirective);
+    internal bool IsPreviewDirectiveSpecified => Directives.Any(d => d.IsPreviewDirective);
 }
 
-internal partial class CommandInput
+public partial class CommandInput
 {
     private static IReadOnlyList<DirectiveInput> ParseDirectives(
         IReadOnlyList<string> commandLineArguments,
@@ -126,7 +135,7 @@ internal partial class CommandInput
             if (isOptionIdentifier)
                 break;
 
-            result.Add(new ParameterInput(argument));
+            result.Add(new ParameterInput(index, argument));
         }
 
         return result;
@@ -188,7 +197,7 @@ internal partial class CommandInput
         return result;
     }
 
-    public static CommandInput Parse(
+    internal static CommandInput Parse(
         IReadOnlyList<string> commandLineArguments,
         IReadOnlyDictionary<string, string> environmentVariables,
         IReadOnlyList<string> availableCommandNames
diff --git a/CliFx/Input/DirectiveInput.cs b/CliFx/Input/DirectiveInput.cs
index 12d318a..9e934e7 100644
--- a/CliFx/Input/DirectiveInput.cs
+++ b/CliFx/Input/DirectiveInput.cs
@@ -2,13 +2,19 @@
 
 namespace CliFx.Input;
 
+/// <summary>
+/// Input provided by the means of a directive.
+/// </summary>
 public class DirectiveInput(string name)
 {
+    /// <summary>
+    /// Directive name.
+    /// </summary>
     public string Name { get; } = name;
 
-    public bool IsDebugDirective =>
+    internal bool IsDebugDirective =>
         string.Equals(Name, "debug", StringComparison.OrdinalIgnoreCase);
 
-    public bool IsPreviewDirective =>
+    internal bool IsPreviewDirective =>
         string.Equals(Name, "preview", StringComparison.OrdinalIgnoreCase);
 }
diff --git a/CliFx/Input/EnvironmentVariableInput.cs b/CliFx/Input/EnvironmentVariableInput.cs
index 4ebd59f..01419f7 100644
--- a/CliFx/Input/EnvironmentVariableInput.cs
+++ b/CliFx/Input/EnvironmentVariableInput.cs
@@ -3,11 +3,20 @@ using System.IO;
 
 namespace CliFx.Input;
 
+/// <summary>
+/// Input provided by the means of an environment variable.
+/// </summary>
 public class EnvironmentVariableInput(string name, string value)
 {
+    /// <summary>
+    /// Environment variable name.
+    /// </summary>
     public string Name { get; } = name;
 
+    /// <summary>
+    /// Environment variable value.
+    /// </summary>
     public string Value { get; } = value;
 
-    public IReadOnlyList<string> SplitValues() => Value.Split(Path.PathSeparator);
+    internal IReadOnlyList<string> SplitValues() => Value.Split(Path.PathSeparator);
 }
diff --git a/CliFx/Input/OptionInput.cs b/CliFx/Input/OptionInput.cs
index 327a19d..99ed920 100644
--- a/CliFx/Input/OptionInput.cs
+++ b/CliFx/Input/OptionInput.cs
@@ -3,7 +3,7 @@
 namespace CliFx.Input;
 
 /// <summary>
-/// Describes the materialized input for an option of a command.
+/// Input provided by the means of an option.
 /// </summary>
 public class OptionInput(string identifier, IReadOnlyList<string> values)
 {
@@ -13,7 +13,7 @@ public class OptionInput(string identifier, IReadOnlyList<string> values)
     public string Identifier { get; } = identifier;
 
     /// <summary>
-    /// Provided option values.
+    /// Option value(s).
     /// </summary>
     public IReadOnlyList<string> Values { get; } = values;
 
diff --git a/CliFx/Input/ParameterInput.cs b/CliFx/Input/ParameterInput.cs
index d533859..2a1713e 100644
--- a/CliFx/Input/ParameterInput.cs
+++ b/CliFx/Input/ParameterInput.cs
@@ -1,10 +1,15 @@
 namespace CliFx.Input;
 
 /// <summary>
-/// Describes the materialized input for a parameter of a command.
+/// Input provided by the means of a parameter.
 /// </summary>
-public class ParameterInput(string value)
+public class ParameterInput(int order, string value)
 {
+    /// <summary>
+    /// Parameter order.
+    /// </summary>
+    public int Order { get; } = order;
+
     /// <summary>
     /// Parameter value.
     /// </summary>
diff --git a/CliFx/Schema/CommandSchema.cs b/CliFx/Schema/CommandSchema.cs
index 68df727..b9fc517 100644
--- a/CliFx/Schema/CommandSchema.cs
+++ b/CliFx/Schema/CommandSchema.cs
@@ -5,7 +5,7 @@ using System.Diagnostics.CodeAnalysis;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Describes an individual command, with its parameter and option bindings.
+/// Describes an individual command, along with its parameter and option inputs.
 /// </summary>
 public class CommandSchema(
     [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type type,
@@ -27,7 +27,7 @@ public class CommandSchema(
     public string? Name { get; } = name;
 
     /// <summary>
-    /// Whether this command is the application's default command.
+    /// Whether the command is the application's default command.
     /// </summary>
     public bool IsDefault { get; } = string.IsNullOrWhiteSpace(name);
 
@@ -37,12 +37,12 @@ public class CommandSchema(
     public string? Description { get; } = description;
 
     /// <summary>
-    /// Command parameters.
+    /// Parameter inputs of the command.
     /// </summary>
     public IReadOnlyList<ParameterSchema> Parameters { get; } = parameters;
 
     /// <summary>
-    /// Command options.
+    /// Option inputs of the command.
     /// </summary>
     public IReadOnlyList<OptionSchema> Options { get; } = options;
 
diff --git a/CliFx/Schema/InputSchema.cs b/CliFx/Schema/InputSchema.cs
index 0401641..4f4e260 100644
--- a/CliFx/Schema/InputSchema.cs
+++ b/CliFx/Schema/InputSchema.cs
@@ -4,7 +4,7 @@ using CliFx.Extensibility;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Describes an input binding of a command.
+/// Describes an input of a command.
 /// </summary>
 public abstract class InputSchema(
     PropertyBinding property,
@@ -19,7 +19,7 @@ public abstract class InputSchema(
     public PropertyBinding Property { get; } = property;
 
     /// <summary>
-    /// Whether this input can accept more than one value.
+    /// Whether the input can accept more than one value.
     /// </summary>
     public bool IsSequence { get; } = isSequence;
 
diff --git a/CliFx/Schema/OptionSchema.cs b/CliFx/Schema/OptionSchema.cs
index c59dce2..493760e 100644
--- a/CliFx/Schema/OptionSchema.cs
+++ b/CliFx/Schema/OptionSchema.cs
@@ -6,7 +6,7 @@ using CliFx.Extensibility;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Describes an option binding of a command.
+/// Describes an option input of a command.
 /// </summary>
 public class OptionSchema(
     PropertyBinding property,
diff --git a/CliFx/Schema/ParameterSchema.cs b/CliFx/Schema/ParameterSchema.cs
index 15f75db..b52f40d 100644
--- a/CliFx/Schema/ParameterSchema.cs
+++ b/CliFx/Schema/ParameterSchema.cs
@@ -4,7 +4,7 @@ using CliFx.Extensibility;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Describes a parameter binding of a command.
+/// Describes a parameter input of a command.
 /// </summary>
 public class ParameterSchema(
     PropertyBinding property,
diff --git a/CliFx/Schema/PropertyBinding.cs b/CliFx/Schema/PropertyBinding.cs
index a7a48dc..fa3e651 100644
--- a/CliFx/Schema/PropertyBinding.cs
+++ b/CliFx/Schema/PropertyBinding.cs
@@ -6,11 +6,13 @@ using System.Linq;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Represents a CLR property binding.
+/// Represents a wrapper around a CLR property that provides read and write access to its value.
 /// </summary>
 public class PropertyBinding(
-    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.Interfaces | DynamicallyAccessedMemberTypes.PublicMethods)]
-    Type type,
+    [DynamicallyAccessedMembers(
+        DynamicallyAccessedMemberTypes.Interfaces | DynamicallyAccessedMemberTypes.PublicMethods
+    )]
+        Type type,
     Func<object, object?> getValue,
     Action<object, object?> setValue
 )
@@ -18,7 +20,9 @@ public class PropertyBinding(
     /// <summary>
     /// Underlying CLR type of the property.
     /// </summary>
-    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.Interfaces | DynamicallyAccessedMemberTypes.PublicMethods)]
+    [DynamicallyAccessedMembers(
+        DynamicallyAccessedMemberTypes.Interfaces | DynamicallyAccessedMemberTypes.PublicMethods
+    )]
     public Type Type { get; } = type;
 
     /// <summary>
@@ -27,7 +31,7 @@ public class PropertyBinding(
     public object? GetValue(object instance) => getValue(instance);
 
     /// <summary>
-    /// Sets the value of the property on the specified instance.
+    /// Sets the current value of the property on the specified instance.
     /// </summary>
     public void SetValue(object instance, object? value) => setValue(instance, value);
 
@@ -40,7 +44,7 @@ public class PropertyBinding(
             Type.GetEnumValuesAsUnderlyingType();
 #else
                 // AOT-compatible APIs are not available here, but it's unlikely
-                // someone will be AOT-compiling a net6.0 or older app anyway.
+                // that someone will be AOT-compiling a net6.0 or older app anyway.
                 Type.GetEnumValues();
 #endif