diff --git a/core/Microsoft.Mcp.Core/tests/Microsoft.Mcp.Tests/Helpers/TestEnvironment.cs b/core/Microsoft.Mcp.Core/tests/Microsoft.Mcp.Tests/Helpers/TestEnvironment.cs
index 6886aae237..591cec2309 100644
--- a/core/Microsoft.Mcp.Core/tests/Microsoft.Mcp.Tests/Helpers/TestEnvironment.cs
+++ b/core/Microsoft.Mcp.Core/tests/Microsoft.Mcp.Tests/Helpers/TestEnvironment.cs
@@ -34,4 +34,19 @@ public static void SetAzureSubscriptionId(string subscriptionId)
     /// </summary>
     public static void ClearAzureSubscriptionId()
         => Environment.SetEnvironmentVariable(EnvironmentHelpers.AzureSubscriptionIdEnvironmentVariable, null);
+
+    /// <summary>
+    /// Skips the test if a default subscription is configured via Azure CLI profile or AZURE_SUBSCRIPTION_ID.
+    /// This is useful for tests that validate missing required --subscription parameters,
+    /// which have fallback to default subscription sources in SubscriptionCommand.
+    /// </summary>
+    public static void SkipIfDefaultSubscriptionConfigured()
+    {
+        if (!string.IsNullOrEmpty(CommandHelper.GetDefaultSubscription()))
+        {
+            Xunit.Assert.Skip(
+                "An Azure CLI default subscription is configured; cannot validate missing --subscription. " +
+                "Run 'az logout' or 'az account clear' to clear the profile, then restart the test runner.");
+        }
+    }
 }
diff --git a/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/AvailabilityStatus/AvailabilityStatusGetCommandTests.cs b/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/AvailabilityStatus/AvailabilityStatusGetCommandTests.cs
index 00b9147e9b..e9546dbfaa 100644
--- a/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/AvailabilityStatus/AvailabilityStatusGetCommandTests.cs
+++ b/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/AvailabilityStatus/AvailabilityStatusGetCommandTests.cs
@@ -6,6 +6,7 @@
 using Azure.Mcp.Tools.ResourceHealth.Services;
 using Microsoft.Mcp.Core.Options;
 using Microsoft.Mcp.Tests.Client;
+using Microsoft.Mcp.Tests.Helpers;
 using NSubstitute;
 using NSubstitute.ExceptionExtensions;
 using Xunit;
@@ -172,6 +173,11 @@ public async Task ExecuteAsync_HandlesException_WhenListingResources()
     [InlineData("--subscription")]
     public async Task ExecuteAsync_ReturnsError_WhenRequiredParameterIsMissing(string missingParameter)
     {
+        // The subscription option falls back to the Azure CLI profile or AZURE_SUBSCRIPTION_ID env var.
+        // Skip if a CLI profile default is present so the test only runs when
+        // the missing-subscription path is actually exercised.
+        TestEnvironment.SkipIfDefaultSubscriptionConfigured();
+
         var argsList = new List<string>();
         if (missingParameter != "--subscription")
         {
diff --git a/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/ServiceHealthEvents/ServiceHealthEventsListCommandTests.cs b/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/ServiceHealthEvents/ServiceHealthEventsListCommandTests.cs
index c87e57371a..5ecf953a34 100644
--- a/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/ServiceHealthEvents/ServiceHealthEventsListCommandTests.cs
+++ b/tools/Azure.Mcp.Tools.ResourceHealth/tests/Azure.Mcp.Tools.ResourceHealth.UnitTests/ServiceHealthEvents/ServiceHealthEventsListCommandTests.cs
@@ -6,6 +6,7 @@
 using Azure.Mcp.Tools.ResourceHealth.Services;
 using Microsoft.Mcp.Core.Options;
 using Microsoft.Mcp.Tests.Client;
+using Microsoft.Mcp.Tests.Helpers;
 using NSubstitute;
 using NSubstitute.ExceptionExtensions;
 using Xunit;
@@ -25,6 +26,14 @@ public class ServiceHealthEventsListCommandTests : CommandUnitTestsBase<ServiceH
     [InlineData("--subscription sub123 --filter startTime ge 2023-01-01", true)]
     public async Task ExecuteAsync_ValidatesInput(string args, bool shouldSucceed)
     {
+        // The subscription option falls back to the Azure CLI profile or AZURE_SUBSCRIPTION_ID env var.
+        // For the empty-args (missing subscription) cases, skip when a CLI
+        // profile default is present so we only assert when validation actually fails.
+        if (!shouldSucceed && string.IsNullOrWhiteSpace(args))
+        {
+            TestEnvironment.SkipIfDefaultSubscriptionConfigured();
+        }
+
         // Arrange
         if (shouldSucceed)
         {