diff --git a/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs b/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs
index fc526132..3c8981b6 100644
--- a/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs
+++ b/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs
@@ -508,20 +508,33 @@ public void WithTools_Parameters_Satisfiable_From_DI(bool parameterInServices)
     }
 
     [Theory]
-    [InlineData(false)]
-    [InlineData(true)]
-    public void WithToolsFromAssembly_Parameters_Satisfiable_From_DI(bool parameterInServices)
+    [InlineData(ServiceLifetime.Singleton)]
+    [InlineData(ServiceLifetime.Scoped)]
+    [InlineData(ServiceLifetime.Transient)]
+    [InlineData(null)]
+    public void WithToolsFromAssembly_Parameters_Satisfiable_From_DI(ServiceLifetime? lifetime)
     {
         ServiceCollection sc = new();
-        if (parameterInServices)
+        switch (lifetime)
         {
-            sc.AddSingleton(new ComplexObject());
+            case ServiceLifetime.Singleton:
+                sc.AddSingleton(new ComplexObject());
+                break;
+
+            case ServiceLifetime.Scoped:
+                sc.AddScoped(_ => new ComplexObject());
+                break;
+
+            case ServiceLifetime.Transient:
+                sc.AddTransient(_ => new ComplexObject());
+                break;
         }
+
         sc.AddMcpServer().WithToolsFromAssembly();
         IServiceProvider services = sc.BuildServiceProvider();
 
         McpServerTool tool = services.GetServices<McpServerTool>().First(t => t.ProtocolTool.Name == "EchoComplex");
-        if (parameterInServices)
+        if (lifetime is not null)
         {
             Assert.DoesNotContain("\"complex\"", JsonSerializer.Serialize(tool.ProtocolTool.InputSchema));
         }
diff --git a/tests/ModelContextProtocol.Tests/Server/McpServerToolTests.cs b/tests/ModelContextProtocol.Tests/Server/McpServerToolTests.cs
index 2d747d9d..30d13fd9 100644
--- a/tests/ModelContextProtocol.Tests/Server/McpServerToolTests.cs
+++ b/tests/ModelContextProtocol.Tests/Server/McpServerToolTests.cs
@@ -45,20 +45,47 @@ public async Task SupportsIMcpServer()
         Assert.Equal("42", result.Content[0].Text);
     }
 
-    [Fact]
-    public async Task SupportsServiceFromDI()
+    [Theory]
+    [InlineData(ServiceLifetime.Singleton)]
+    [InlineData(ServiceLifetime.Scoped)]
+    [InlineData(ServiceLifetime.Transient)]
+    public async Task SupportsServiceFromDI(ServiceLifetime injectedArgumentLifetime)
     {
-        MyService expectedMyService = new();
+        MyService singletonService = new();
 
         ServiceCollection sc = new();
-        sc.AddSingleton(expectedMyService);
-        IServiceProvider services = sc.BuildServiceProvider();
+        switch (injectedArgumentLifetime)
+        {
+            case ServiceLifetime.Singleton:
+                sc.AddSingleton(singletonService);
+                break;
+
+            case ServiceLifetime.Scoped:
+                sc.AddScoped(_ => new MyService());
+                break;
+
+            case ServiceLifetime.Transient:
+                sc.AddTransient(_ => new MyService());
+                break;
+        }
 
-        McpServerTool tool = McpServerTool.Create((MyService actualMyService) =>
+        sc.AddSingleton(services =>
         {
-            Assert.Same(expectedMyService, actualMyService);
-            return "42";
-        }, new() { Services = services });
+            return McpServerTool.Create((MyService actualMyService) =>
+            {
+                Assert.NotNull(actualMyService);
+                if (injectedArgumentLifetime == ServiceLifetime.Singleton)
+                {
+                    Assert.Same(singletonService, actualMyService);
+                }
+
+                return "42";
+            }, new() { Services = services });
+        });
+
+        IServiceProvider services = sc.BuildServiceProvider();
+
+        McpServerTool tool = services.GetRequiredService<McpServerTool>();
 
         Assert.DoesNotContain("actualMyService", JsonSerializer.Serialize(tool.ProtocolTool.InputSchema));