diff --git a/CliFx/Domain/CommandArgumentSchema.cs b/CliFx/Domain/CommandArgumentSchema.cs
index 0aa4fbf..0cd0cff 100644
--- a/CliFx/Domain/CommandArgumentSchema.cs
+++ b/CliFx/Domain/CommandArgumentSchema.cs
@@ -19,7 +19,7 @@ namespace CliFx.Domain
 
         public Type? ConverterType { get; }
 
-        private readonly Type[]? _validators;
+        public readonly Type[]? ValidatorTypes;
 
         protected CommandArgumentSchema(PropertyInfo? property, string? description, Type? converterType = null, Type[]? validators = null)
         {
@@ -27,7 +27,7 @@ namespace CliFx.Domain
             Description = description;
             ConverterType = converterType;
 
-            _validators = validators;
+            ValidatorTypes = validators;
         }
 
         private Type? TryGetEnumerableArgumentUnderlyingType() =>
@@ -140,7 +140,7 @@ namespace CliFx.Domain
         {
             var value = Convert(values);
 
-            if (_validators.NotEmpty())
+            if (ValidatorTypes.NotEmpty())
                 Validate(value);
 
             Property?.SetValue(command, value);
@@ -171,9 +171,9 @@ namespace CliFx.Domain
                 return;
 
             var failed = new List<ValidationResult>();
-            foreach (var validator in _validators!)
+            foreach (var validator in ValidatorTypes!)
             {
-                var result = validator.InstanceOf<IArgumentValueValidator>().Validate(value!);
+                var result = validator.CreateInstance<IArgumentValueValidator>().Validate(value!);
                 if (result.IsValid)
                     continue;
 
diff --git a/CliFx/Domain/CommandOptionSchema.cs b/CliFx/Domain/CommandOptionSchema.cs
index dc342f4..941a23f 100644
--- a/CliFx/Domain/CommandOptionSchema.cs
+++ b/CliFx/Domain/CommandOptionSchema.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Reflection;
@@ -26,8 +25,8 @@ namespace CliFx.Domain
             bool isRequired,
             string? description,
             Type? converterType = null,
-            Type[]? validators = null)
-            : base(property, description, converterType, validators)
+            Type[]? validatorTypes = null)
+            : base(property, description, converterType, validatorTypes)
         {
             Name = name;
             ShortName = shortName;
@@ -110,9 +109,9 @@ namespace CliFx.Domain
     internal partial class CommandOptionSchema
     {
         public static CommandOptionSchema HelpOption { get; } =
-            new CommandOptionSchema(null, "help", 'h', null, false, "Shows help text.", null);
+            new CommandOptionSchema(null, "help", 'h', null, false, "Shows help text.", converterType: null, validatorTypes: null);
 
         public static CommandOptionSchema VersionOption { get; } =
-            new CommandOptionSchema(null, "version", null, null, false, "Shows version information.", null);
+            new CommandOptionSchema(null, "version", null, null, false, "Shows version information.", converterType: null, validatorTypes: null);
     }
 }
\ No newline at end of file
diff --git a/CliFx/Domain/CommandParameterSchema.cs b/CliFx/Domain/CommandParameterSchema.cs
index 7aa556e..814c8d6 100644
--- a/CliFx/Domain/CommandParameterSchema.cs
+++ b/CliFx/Domain/CommandParameterSchema.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
 using System.Text;
@@ -19,8 +18,8 @@ namespace CliFx.Domain
             string name,
             string? description,
             Type? converterType = null,
-            Type[]? validators = null)
-            : base(property, description, converterType, validators)
+            Type[]? validatorTypes = null)
+            : base(property, description, converterType, validatorTypes)
         {
             Order = order;
             Name = name;
diff --git a/CliFx/Domain/RootSchema.cs b/CliFx/Domain/RootSchema.cs
index 431bc43..98fff68 100644
--- a/CliFx/Domain/RootSchema.cs
+++ b/CliFx/Domain/RootSchema.cs
@@ -126,6 +126,18 @@ namespace CliFx.Domain
                     invalidConverterParameters
                 );
             }
+
+            var invalidValidatorParameters = command.Parameters
+                .Where(p => p.ValidatorTypes != null && !p.ValidatorTypes.All(x => x.Implements(typeof(IArgumentValueValidator))))
+                .ToArray();
+
+            if (invalidValidatorParameters.Any())
+            {
+                throw CliFxException.ParametersWithInvalidValidators(
+                    command,
+                    invalidValidatorParameters
+                );
+            }
         }
 
         private static void ValidateOptions(CommandSchema command)
@@ -208,6 +220,18 @@ namespace CliFx.Domain
                     invalidConverterOptions
                 );
             }
+
+            var invalidValidatorOptions = command.Options
+                .Where(o => o.ValidatorTypes != null && !o.ValidatorTypes.All(x => x.Implements(typeof(IArgumentValueValidator))))
+                .ToArray();
+
+            if (invalidValidatorOptions.Any())
+            {
+                throw CliFxException.OptionsWithInvalidValidators(
+                    command,
+                    invalidValidatorOptions
+                );
+            }
         }
 
         private static void ValidateCommands(IReadOnlyList<CommandSchema> commands)
diff --git a/CliFx/Exceptions/CliFxException.cs b/CliFx/Exceptions/CliFxException.cs
index cb3075f..8535621 100644
--- a/CliFx/Exceptions/CliFxException.cs
+++ b/CliFx/Exceptions/CliFxException.cs
@@ -185,6 +185,19 @@ Specified converter must implement {typeof(IArgumentValueConverter).FullName}.";
             return new CliFxException(message.Trim());
         }
 
+        internal static CliFxException ParametersWithInvalidValidators(
+            CommandSchema command,
+            IReadOnlyList<CommandParameterSchema> invalidParameters)
+        {
+            var message = $@"
+Command '{command.Type.FullName}' is invalid because it contains {invalidParameters.Count} parameter(s) with invalid value validators:
+{invalidParameters.JoinToString(Environment.NewLine)}
+
+Specified validator(s) must inherit from {typeof(ArgumentValueValidator<>).FullName}.";
+
+            return new CliFxException(message.Trim());
+        }
+
         internal static CliFxException OptionsWithNoName(
             CommandSchema command,
             IReadOnlyList<CommandOptionSchema> invalidOptions)
@@ -269,6 +282,19 @@ Specified converter must implement {typeof(IArgumentValueConverter).FullName}.";
 
             return new CliFxException(message.Trim());
         }
+
+        internal static CliFxException OptionsWithInvalidValidators(
+            CommandSchema command,
+            IReadOnlyList<CommandOptionSchema> invalidOptions)
+        {
+            var message = $@"
+Command '{command.Type.FullName}' is invalid because it contains {invalidOptions.Count} option(s) with invalid validators:
+{invalidOptions.JoinToString(Environment.NewLine)}
+
+Specified validators must inherit from {typeof(IArgumentValueValidator).FullName}.";
+
+            return new CliFxException(message.Trim());
+        }
     }
 
     // End-user-facing exceptions