diff --git a/src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs b/src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs
index 0f33c8e..ad37f37 100644
--- a/src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs
+++ b/src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs
@@ -270,7 +270,7 @@ internal sealed class AIFunctionMcpServerTool : McpServerTool
             return new CallToolResponse()
             {
                 IsError = true,
-                Content = [new() { Text = e.Message, Type = "text" }],
+                Content = [new() { Text = $"An error occurred invoking '{request.Params?.Name}'.", Type = "text" }],
             };
         }
 
diff --git a/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs b/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs
index a93a309..57e6eb8 100644
--- a/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs
+++ b/tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs
@@ -376,7 +376,7 @@ public class McpServerBuilderExtensionsToolsTests : ClientServerTestBase
         Assert.True(result.IsError);
         Assert.NotNull(result.Content);
         Assert.NotEmpty(result.Content);
-        Assert.Contains("Test error", result.Content[0].Text);
+        Assert.Contains("An error occurred", result.Content[0].Text);
     }
 
     [Fact]