Throw ArgumentNullExceptions for null arguments (#570)

### Motivation and Context

Use ArgumentNullException as devs expect, and avoid exception-related
work when not throwing.

### Description

.NET developers expect that passing null erroneously to a method will
result in an ArgumentNullException, but currently it's resulting in a
custom ValidationException.

There are also places where string interpolation is being used to create
the error message; the work and allocation associated with that
interpolation is going to happen regardless of whether the exception is
thrown or not.

dotnet/src/Connectors/Connectors.AI.OpenAI/AzureSdk/ClientBase.cs

@@ -40,7 +40,7 @@ public abstract class ClientBase
         CompleteRequestSettings requestSettings,
         CancellationToken cancellationToken = default)
     {
-        Verify.NotNull(requestSettings, "Completion settings cannot be empty");
+        Verify.NotNull(requestSettings);
 
         if (requestSettings.MaxTokens < 1)
         {
@@ -126,8 +126,8 @@ public abstract class ClientBase
         ChatRequestSettings requestSettings,
         CancellationToken cancellationToken = default)
     {
-        Verify.NotNull(chat, "The chat history cannot be null");
-        Verify.NotNull(requestSettings, "Completion settings cannot be empty");
+        Verify.NotNull(chat);
+        Verify.NotNull(requestSettings);
 
         if (requestSettings.MaxTokens < 1)
         {

dotnet/src/Extensions/Planning.ActionPlanner/ActionPlanner.cs

@@ -47,7 +47,7 @@ public sealed class ActionPlanner
         IKernel kernel,
         string? prompt = null)
     {
-        Verify.NotNull(kernel, "The planner requires a non-null kernel instance");
+        Verify.NotNull(kernel);
 
         string promptTemplate = prompt ?? EmbeddedResource.Read("skprompt.txt");
 
@@ -140,7 +140,7 @@ public sealed class ActionPlanner
     [SKFunctionInput(Description = "The current goal processed by the planner", DefaultValue = "")]
     public string ListOfFunctions(string goal, SKContext context)
     {
-        Verify.NotNull(context.Skills, "The planner requires a non-null skill collection");
+        Verify.NotNull(context.Skills);
         var functionsAvailable = context.Skills.GetFunctionsView();
 
         // Prepare list using the format used by skprompt.txt

dotnet/src/Extensions/Planning.SequentialPlanner/SequentialPlanParser.cs

@@ -89,9 +89,6 @@ internal static class SequentialPlanParser
 
                         if (!string.IsNullOrEmpty(functionName) && context.IsFunctionRegistered(skillName, functionName, out var skillFunction))
                         {
-                            Verify.NotNull(functionName, nameof(functionName));
-                            Verify.NotNull(skillFunction, nameof(skillFunction));
-
                             var planStep = new Plan(skillFunction);
 
                             var functionVariables = new ContextVariables();

dotnet/src/Extensions/Planning.SequentialPlanner/SequentialPlanner.cs

@@ -29,7 +29,7 @@ public sealed class SequentialPlanner
         SequentialPlannerConfig? config = null,
         string? prompt = null)
     {
-        Verify.NotNull(kernel, $"{this.GetType().FullName} requires a kernel instance.");
+        Verify.NotNull(kernel);
         this.Config = config ?? new();
 
         this.Config.ExcludedSkills.Add(RestrictedSkillName);

dotnet/src/SemanticKernel.Abstractions/AI/Embeddings/Embedding.cs

@@ -42,7 +42,7 @@ public readonly struct Embedding<TEmbedding> : IEquatable<Embedding<TEmbedding>>
     [JsonConstructor]
     public Embedding(IEnumerable<TEmbedding> vector)
     {
-        Verify.NotNull(vector, nameof(vector));
+        Verify.NotNull(vector);
 
         if (!IsSupported)
         {

dotnet/src/SemanticKernel.Abstractions/AI/Embeddings/IEmbeddingGeneration.cs

@@ -43,7 +43,7 @@ public static class EmbeddingGenerationExtensions
         (this IEmbeddingGeneration<TValue, TEmbedding> generator, TValue value, CancellationToken cancellationToken = default)
         where TEmbedding : unmanaged
     {
-        Verify.NotNull(generator, "Embeddings generator cannot be NULL");
+        Verify.NotNull(generator);
         return (await generator.GenerateEmbeddingsAsync(new[] { value }, cancellationToken).ConfigureAwait(false)).FirstOrDefault();
     }
 }

dotnet/src/SemanticKernel.Abstractions/Diagnostics/CompilerServicesAttributes.cs

@@ -0,0 +1,23 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#pragma warning disable IDE0130 // Namespace does not match folder structure
+// ReSharper disable once CheckNamespace
+namespace System.Runtime.CompilerServices;
+#pragma warning restore IDE0130
+
+#if !NETCOREAPP
+
+[AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false, Inherited = false)]
+internal sealed class CallerArgumentExpressionAttribute : Attribute
+{
+    public CallerArgumentExpressionAttribute(string parameterName)
+    {
+        this.ParameterName = parameterName;
+    }
+
+    public string ParameterName { get; }
+}
+
+#endif

dotnet/src/SemanticKernel.Abstractions/Diagnostics/Verify.cs

@@ -15,18 +15,18 @@ internal static class Verify
     private static readonly Regex s_asciiLettersDigitsUnderscoresRegex = new("^[0-9A-Za-z_]*$");
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void NotNull([NotNull] object? obj, string message)
+    internal static void NotNull([NotNull] object? obj, [CallerArgumentExpression(nameof(obj))] string? paramName = null)
     {
         if (obj is null)
         {
-            ThrowValidationException(ValidationException.ErrorCodes.NullValue, message);
+            ThrowArgumentNullException(paramName);
         }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal static void NotEmpty([NotNull] string? str, string message)
+    internal static void NotEmpty([NotNull] string? str, string? message = null, [CallerArgumentExpression(nameof(str))] string? paramName = null)
     {
-        NotNull(str, message);
+        NotNull(str, paramName);
         if (string.IsNullOrWhiteSpace(str))
         {
             ThrowValidationException(ValidationException.ErrorCodes.EmptyValue, message);
@@ -62,8 +62,8 @@ internal static class Verify
 
     internal static void StartsWith(string text, string prefix, string message)
     {
-        NotEmpty(text, "The text to verify cannot be empty");
-        NotNull(prefix, "The prefix to verify is empty");
+        NotEmpty(text);
+        NotNull(prefix);
         if (!text.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
         {
             ThrowValidationException(ValidationException.ErrorCodes.MissingPrefix, message);
@@ -104,26 +104,6 @@ internal static class Verify
         }
     }
 
-    internal static void GreaterThan<T>(T value, T min, string message) where T : IComparable<T>
-    {
-        int cmp = value.CompareTo(min);
-
-        if (cmp <= 0)
-        {
-            throw new ValidationException(ValidationException.ErrorCodes.OutOfRange, message);
-        }
-    }
-
-    public static void LessThan<T>(T value, T max, string message) where T : IComparable<T>
-    {
-        int cmp = value.CompareTo(max);
-
-        if (cmp >= 0)
-        {
-            throw new ValidationException(ValidationException.ErrorCodes.OutOfRange, message);
-        }
-    }
-
     [DoesNotReturn]
     private static void ThrowInvalidName(string kind, string name) =>
         throw new KernelException(
@@ -131,6 +111,14 @@ internal static class Verify
             $"A {kind} can contain only ASCII letters, digits, and underscores: '{name}' is not a valid name.");
 
     [DoesNotReturn]
-    private static void ThrowValidationException(ValidationException.ErrorCodes errorCodes, string message) =>
+    internal static void ThrowArgumentNullException(string? paramName) =>
+        throw new ArgumentNullException(paramName);
+
+    [DoesNotReturn]
+    internal static void ThrowArgumentOutOfRangeException<T>(string? paramName, T actualValue, string message) =>
+        throw new ArgumentOutOfRangeException(paramName, actualValue, message);
+
+    [DoesNotReturn]
+    internal static void ThrowValidationException(ValidationException.ErrorCodes errorCodes, string? message) =>
         throw new ValidationException(errorCodes, message);
 }

dotnet/src/SemanticKernel.Abstractions/Orchestration/SKContext.cs

@@ -94,7 +94,10 @@ public sealed class SKContext
     /// <returns>Delegate to execute the function</returns>
     public ISKFunction Func(string skillName, string functionName)
     {
-        Verify.NotNull(this.Skills, "The skill collection hasn't been set");
+        if (this.Skills is null)
+        {
+            Verify.ThrowValidationException(ValidationException.ErrorCodes.NullValue, nameof(this.Skills));
+        }
 
         if (this.Skills.HasNativeFunction(skillName, functionName))
         {

dotnet/src/SemanticKernel.Abstractions/SemanticFunctions/PromptTemplateConfig.cs

@@ -179,7 +179,10 @@ public class PromptTemplateConfig
     public static PromptTemplateConfig FromJson(string json)
     {
         var result = Json.Deserialize<PromptTemplateConfig>(json);
-        Verify.NotNull(result, "Unable to deserialize prompt template config. The deserialized returned NULL.");
+        if (result is null)
+        {
+            Verify.ThrowValidationException(ValidationException.ErrorCodes.NullValue, "Unable to deserialize prompt template config. The deserialized returned NULL.");
+        }
         return result;
     }
 }

dotnet/src/SemanticKernel.UnitTests/AI/Embeddings/EmbeddingTests.cs

@@ -69,7 +69,7 @@ public class EmbeddingTests
     public void ItThrowsWithNullVector()
     {
         // Assert
-        Assert.Throws<ValidationException>(() => new Embedding<float>(null!));
+        Assert.Throws<ArgumentNullException>("vector", () => new Embedding<float>(null!));
     }
 
     [Fact]

dotnet/src/SemanticKernel.UnitTests/Memory/Collections/MinHeapTests.cs

@@ -1,8 +1,8 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
-using Microsoft.SemanticKernel.Diagnostics;
 using Microsoft.SemanticKernel.Memory.Collections;
 using Xunit;
 
@@ -27,11 +27,10 @@ public class MinHeapTests
         };
 
         // Act
-        var exception = Assert.Throws<ValidationException>(() => action());
+        var exception = Assert.Throws<ArgumentOutOfRangeException>("capacity", () => action());
 
         // Assert
-        Assert.Equal(ValidationException.ErrorCodes.OutOfRange, exception.ErrorCode);
-        Assert.Equal("Out of range: MinHeap capacity must be greater than 0.", exception.Message);
+        Assert.Equal(-1, exception.ActualValue);
     }
 
     [Fact]
@@ -91,11 +90,10 @@ public class MinHeapTests
         var action = () => { minHeap.Add(items, startIndex); };
 
         // Act
-        var exception = Assert.Throws<ValidationException>(() => action());
+        var exception = Assert.Throws<ArgumentOutOfRangeException>("startAt", () => action());
 
         // Assert
-        Assert.Equal(ValidationException.ErrorCodes.OutOfRange, exception.ErrorCode);
-        Assert.Equal("Out of range: startAt value must be less than items count.", exception.Message);
+        Assert.Equal(startIndex, exception.ActualValue);
     }
 
     [Fact]

dotnet/src/SemanticKernel/AI/Embeddings/IEmbeddingIndex.cs

@@ -42,7 +42,7 @@ public static class EmbeddingIndexExtensions
         double minScore = 0.0)
         where TEmbedding : unmanaged
     {
-        Verify.NotNull(index, "Embedding index cannot be NULL");
+        Verify.NotNull(index);
         await foreach (var match in index.GetNearestMatchesAsync(collection, embedding, 1, minScore))
         {
             return match;

dotnet/src/SemanticKernel/Connectors/HuggingFace/TextCompletion/HuggingFaceTextCompletion.cs

@@ -34,7 +34,7 @@ public sealed class HuggingFaceTextCompletion : ITextCompletion, IDisposable
     /// <param name="httpClientHandler">Instance of <see cref="HttpClientHandler"/> to setup specific scenarios.</param>
     public HuggingFaceTextCompletion(Uri endpoint, string model, HttpClientHandler httpClientHandler)
     {
-        Verify.NotNull(endpoint, "Endpoint cannot be null.");
+        Verify.NotNull(endpoint);
         Verify.NotEmpty(model, "Model cannot be empty.");
 
         this._endpoint = endpoint;
@@ -53,7 +53,7 @@ public sealed class HuggingFaceTextCompletion : ITextCompletion, IDisposable
     /// <param name="model">Model to use for service API call.</param>
     public HuggingFaceTextCompletion(Uri endpoint, string model)
     {
-        Verify.NotNull(endpoint, "Endpoint cannot be null.");
+        Verify.NotNull(endpoint);
         Verify.NotEmpty(model, "Model cannot be empty.");
 
         this._endpoint = endpoint;

dotnet/src/SemanticKernel/Connectors/HuggingFace/TextEmbedding/HuggingFaceTextEmbeddingGeneration.cs

@@ -33,7 +33,7 @@ public sealed class HuggingFaceTextEmbeddingGeneration : IEmbeddingGeneration<st
     /// <param name="httpClientHandler">Instance of <see cref="HttpClientHandler"/> to setup specific scenarios.</param>
     public HuggingFaceTextEmbeddingGeneration(Uri endpoint, string model, HttpClientHandler httpClientHandler)
     {
-        Verify.NotNull(endpoint, "Endpoint cannot be null.");
+        Verify.NotNull(endpoint);
         Verify.NotEmpty(model, "Model cannot be empty.");
 
         this._endpoint = endpoint;
@@ -52,7 +52,7 @@ public sealed class HuggingFaceTextEmbeddingGeneration : IEmbeddingGeneration<st
     /// <param name="model">Model to use for service API call.</param>
     public HuggingFaceTextEmbeddingGeneration(Uri endpoint, string model)
     {
-        Verify.NotNull(endpoint, "Endpoint cannot be null.");
+        Verify.NotNull(endpoint);
         Verify.NotEmpty(model, "Model cannot be empty.");
 
         this._endpoint = endpoint;

dotnet/src/SemanticKernel/Kernel.cs

@@ -123,7 +123,7 @@ public sealed class Kernel : IKernel, IDisposable
     {
         // Future-proofing the name not to contain special chars
         Verify.ValidSkillName(skillName);
-        Verify.NotNull(customFunction, $"The {nameof(customFunction)} parameter is not set to an instance of an object.");
+        Verify.NotNull(customFunction);
 
         customFunction.SetDefaultSkillCollection(this.Skills);
         this._skillCollection.AddSemanticFunction(customFunction);

dotnet/src/SemanticKernel/KernelBuilder.cs

@@ -69,7 +69,7 @@ public sealed class KernelBuilder
     /// <returns>Updated kernel builder including the logger.</returns>
     public KernelBuilder WithLogger(ILogger log)
     {
-        Verify.NotNull(log, "The logger instance provided is NULL");
+        Verify.NotNull(log);
         this._log = log;
         return this;
     }
@@ -81,7 +81,7 @@ public sealed class KernelBuilder
     /// <returns>Updated kernel builder including the semantic text memory entity.</returns>
     public KernelBuilder WithMemory(ISemanticTextMemory memory)
     {
-        Verify.NotNull(memory, "The memory instance provided is NULL");
+        Verify.NotNull(memory);
         this._memory = memory;
         return this;
     }
@@ -93,7 +93,7 @@ public sealed class KernelBuilder
     /// <returns>Updated kernel builder including the memory storage.</returns>
     public KernelBuilder WithMemoryStorage(IMemoryStore storage)
     {
-        Verify.NotNull(storage, "The memory instance provided is NULL");
+        Verify.NotNull(storage);
         this._memoryStorage = storage;
         return this;
     }
@@ -107,8 +107,8 @@ public sealed class KernelBuilder
     public KernelBuilder WithMemoryStorageAndTextEmbeddingGeneration(
         IMemoryStore storage, IEmbeddingGeneration<string, float> embeddingGenerator)
     {
-        Verify.NotNull(storage, "The memory instance provided is NULL");
-        Verify.NotNull(embeddingGenerator, "The embedding generator instance provided is NULL");
+        Verify.NotNull(storage);
+        Verify.NotNull(embeddingGenerator);
         this._memory = new SemanticTextMemory(storage, embeddingGenerator);
         return this;
     }
@@ -120,7 +120,7 @@ public sealed class KernelBuilder
     /// <returns>Updated kernel builder including the retry handler factory.</returns>
     public KernelBuilder WithRetryHandlerFactory(IDelegatingHandlerFactory httpHandlerFactory)
     {
-        Verify.NotNull(httpHandlerFactory, "The retry handler factory instance provided is NULL");
+        Verify.NotNull(httpHandlerFactory);
         this._httpHandlerFactory = httpHandlerFactory;
         return this;
     }
@@ -132,7 +132,7 @@ public sealed class KernelBuilder
     /// <returns>Updated kernel builder including the given configuration.</returns>
     public KernelBuilder WithConfiguration(KernelConfig config)
     {
-        Verify.NotNull(config, "The configuration instance provided is NULL");
+        Verify.NotNull(config);
         this._config = config;
         return this;
     }
@@ -144,7 +144,7 @@ public sealed class KernelBuilder
     /// <returns>Updated kernel builder including the updated configuration.</returns>
     public KernelBuilder Configure(Action<KernelConfig> configure)
     {
-        Verify.NotNull(configure, "The configuration action provided is NULL");
+        Verify.NotNull(configure);
         configure.Invoke(this._config);
         return this;
     }

dotnet/src/SemanticKernel/Memory/Collections/MinHeap.cs

@@ -28,7 +28,10 @@ internal sealed class MinHeap<T> : IEnumerable<T> where T : IComparable<T>
 
     public MinHeap(T minValue, int capacity)
     {
-        Verify.GreaterThan(capacity, MinCapacity, $"MinHeap capacity must be greater than {MinCapacity}.");
+        if (capacity < MinCapacity)
+        {
+            Verify.ThrowArgumentOutOfRangeException(nameof(capacity), capacity, $"MinHeap capacity must be greater than {MinCapacity}.");
+        }
 
         this._items = new T[capacity + 1];
         //
@@ -106,11 +109,13 @@ internal sealed class MinHeap<T> : IEnumerable<T> where T : IComparable<T>
 
     public void Add(IList<T> items, int startAt = 0)
     {
-        Verify.NotNull(items, nameof(items));
+        Verify.NotNull(items);
 
         int newItemCount = items.Count;
-
-        Verify.LessThan(startAt, newItemCount, $"{nameof(startAt)} value must be less than {nameof(items)} count.");
+        if (startAt >= newItemCount)
+        {
+            Verify.ThrowArgumentOutOfRangeException(nameof(startAt), startAt, $"{nameof(startAt)} value must be less than {nameof(items)}.{nameof(items.Count)}.");
+        }
 
         this.EnsureCapacity(this._count + (newItemCount - startAt));
         for (int i = startAt; i < newItemCount; ++i)
@@ -148,7 +153,10 @@ internal sealed class MinHeap<T> : IEnumerable<T> where T : IComparable<T>
 
     public void EnsureCapacity(int capacity)
     {
-        Verify.GreaterThan(capacity, MinCapacity, $"MinHeap capacity must be greater than {MinCapacity}.");
+        if (capacity < MinCapacity)
+        {
+            Verify.ThrowArgumentOutOfRangeException(nameof(capacity), capacity, $"MinHeap capacity must be greater than {MinCapacity}.");
+        }
 
         // 0th item is always a sentinel
         capacity++;

dotnet/src/SemanticKernel/Memory/MemoryConfiguration.cs

@@ -51,8 +51,8 @@ public static class MemoryConfiguration
     [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope", Justification = "The embeddingGenerator object is disposed by the kernel")]
     public static void UseMemory(this IKernel kernel, IEmbeddingGeneration<string, float> embeddingGenerator, IMemoryStore storage)
     {
-        Verify.NotNull(storage, "The storage instance provided is NULL");
-        Verify.NotNull(embeddingGenerator, "The embedding generator is NULL");
+        Verify.NotNull(storage);
+        Verify.NotNull(embeddingGenerator);
 
         kernel.RegisterMemory(new SemanticTextMemory(storage, embeddingGenerator));
     }

dotnet/src/SemanticKernel/Memory/VolatileMemoryStore.cs

@@ -56,8 +56,8 @@ public class VolatileMemoryStore : IMemoryStore
     /// <inheritdoc/>
     public Task<string> UpsertAsync(string collectionName, MemoryRecord record, CancellationToken cancel = default)
     {
-        Verify.NotNull(record, "Memory record cannot be NULL");
-        Verify.NotNull(record.Metadata.Id, "Memory metadata ID cannot be NULL");
+        Verify.NotNull(record);
+        Verify.NotNull(record.Metadata.Id);
 
         if (this.TryGetCollection(collectionName, out var collectionDict, create: false))
         {

dotnet/src/SemanticKernel/Orchestration/SKContextExtensions.cs

@@ -1,5 +1,6 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.SemanticKernel.SkillDefinition;
 
 #pragma warning disable IDE0130
@@ -16,7 +17,7 @@ internal static class SKContextExtensions
     /// <param name="skillName">The skill name</param>
     /// <param name="functionName">The function name</param>
     /// <param name="registeredFunction">The registered function, if found</param>
-    internal static bool IsFunctionRegistered(this SKContext context, string skillName, string functionName, out ISKFunction? registeredFunction)
+    internal static bool IsFunctionRegistered(this SKContext context, string skillName, string functionName, [NotNullWhen(true)] out ISKFunction? registeredFunction)
     {
         context.ThrowIfSkillCollectionNotSet();
 

dotnet/src/SemanticKernel/Planning/Plan.cs

@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text.Json;
 using System.Text.Json.Serialization;
@@ -395,7 +396,6 @@ public sealed class Plan : ISKFunction
         {
             if (context.IsFunctionRegistered(plan.SkillName, plan.Name, out var skillFunction))
             {
-                Verify.NotNull(skillFunction, nameof(skillFunction));
                 plan.SetFunction(skillFunction);
             }
         }

dotnet/src/SemanticKernel/SkillDefinition/ImportSemanticSkillFromDirectory.cs

@@ -87,7 +87,6 @@ public static class ImportSemanticSkillFromDirectoryExtension
                 if (File.Exists(configPath))
                 {
                     config = PromptTemplateConfig.FromJson(File.ReadAllText(configPath));
-                    Verify.NotNull(config, $"Invalid prompt template configuration, unable to parse {configPath}");
                 }
 
                 kernel.Log.LogTrace("Config {0}: {1}", functionName, config.ToJson());

dotnet/src/SemanticKernel/SkillDefinition/SKFunction.cs

@@ -97,14 +97,14 @@ public sealed class SKFunction : ISKFunction, IDisposable
         SemanticFunctionConfig functionConfig,
         ILogger? log = null)
     {
-        Verify.NotNull(functionConfig, "Function configuration is empty");
+        Verify.NotNull(functionConfig);
 
         async Task<SKContext> LocalFunc(
             ITextCompletion client,
             CompleteRequestSettings requestSettings,
             SKContext context)
         {
-            Verify.NotNull(client, "AI LLM backed is empty");
+            Verify.NotNull(client);
 
             try
             {
@@ -207,7 +207,7 @@ public sealed class SKFunction : ISKFunction, IDisposable
     /// <inheritdoc/>
     public ISKFunction SetAIService(Func<ITextCompletion> serviceFactory)
     {
-        Verify.NotNull(serviceFactory, "AI LLM service factory is empty");
+        Verify.NotNull(serviceFactory);
         this.VerifyIsSemantic();
         this._aiService = serviceFactory.Invoke();
         return this;
@@ -216,7 +216,7 @@ public sealed class SKFunction : ISKFunction, IDisposable
     /// <inheritdoc/>
     public ISKFunction SetAIConfiguration(CompleteRequestSettings settings)
     {
-        Verify.NotNull(settings, "AI LLM request settings are empty");
+        Verify.NotNull(settings);
         this.VerifyIsSemantic();
         this._aiRequestSettings = settings;
         return this;
@@ -292,7 +292,7 @@ public sealed class SKFunction : ISKFunction, IDisposable
         ILogger? log = null
     )
     {
-        Verify.NotNull(delegateFunction, "The function delegate is empty");
+        Verify.NotNull(delegateFunction);
         Verify.ValidSkillName(skillName);
         Verify.ValidFunctionName(functionName);
         Verify.ParametersUniqueness(parameters);
@@ -497,7 +497,7 @@ public sealed class SKFunction : ISKFunction, IDisposable
 
     private static MethodDetails GetMethodDetails(MethodInfo methodSignature, object? methodContainerInstance, ILogger? log = null)
     {
-        Verify.NotNull(methodSignature, "Method is NULL");
+        Verify.NotNull(methodSignature);
 
         var result = new MethodDetails
         {

dotnet/src/SemanticKernel/SkillDefinition/SkillCollection.cs

@@ -51,7 +51,7 @@ public class SkillCollection : ISkillCollection
     /// <inheritdoc/>
     public ISkillCollection AddNativeFunction(ISKFunction functionInstance)
     {
-        Verify.NotNull(functionInstance, "The function is NULL");
+        Verify.NotNull(functionInstance);
         if (!this._skillCollection.ContainsKey(functionInstance.SkillName))
         {
             // Important: names are case insensitive

dotnet/src/Skills/Skills.OpenAPI/Extensions/KernelOpenApiExtensions.cs

@@ -199,7 +199,7 @@ public static class KernelOpenApiExtensions
         AuthenticateRequestAsyncCallback? authCallback = null,
         CancellationToken cancellationToken = default)
     {
-        Verify.NotNull(kernel, nameof(kernel));
+        Verify.NotNull(kernel);
         Verify.ValidSkillName(skillName);
 
         // Parse