Update elicitation schema (#2193)

Author: xiangyan99

core/Azure.Mcp.Core/tests/Azure.Mcp.Core.UnitTests/Areas/Server/Commands/ToolLoading/BaseToolLoaderTests.cs

@@ -420,7 +420,7 @@ public async Task HandleSecretElicitation_WhenUserDeclines_RejectsOperation()
     }
 
     [Fact]
-    public async Task HandleSecretElicitation_UsesConfirmSchemaProperty()
+    public async Task HandleSecretElicitation_UsesDecisionEnumSchema()
     {
         // Arrange
         var mockServer = Substitute.For<McpServer>();
@@ -452,18 +452,20 @@ public async Task HandleSecretElicitation_UsesConfirmSchemaProperty()
         await TestableBaseToolLoader.HandleSecretElicitationAsyncPublic(
             request, "test-tool", dangerouslyDisableElicitation: false, logger, CancellationToken.None);
 
-        // Assert - verify the schema has a confirm boolean property
+        // Assert - verify the schema has a decision single-select enum property with approve/reject
         Assert.NotNull(capturedRequest);
         Assert.NotNull(capturedRequest.Params);
         var elicitParams = JsonSerializer.Deserialize<ElicitRequestParams>(capturedRequest.Params.ToJsonString());
         Assert.NotNull(elicitParams);
         Assert.NotNull(elicitParams.RequestedSchema);
         Assert.NotNull(elicitParams.RequestedSchema.Properties);
         Assert.Single(elicitParams.RequestedSchema.Properties);
-        Assert.True(elicitParams.RequestedSchema.Properties.ContainsKey("confirm"));
+        Assert.True(elicitParams.RequestedSchema.Properties.ContainsKey("decision"));
+        var decisionSchema = Assert.IsType<ElicitRequestParams.UntitledSingleSelectEnumSchema>(elicitParams.RequestedSchema.Properties["decision"]);
+        Assert.Equal(["Approve", "Reject"], decisionSchema.Enum);
         Assert.NotNull(elicitParams.RequestedSchema.Required);
         Assert.Single(elicitParams.RequestedSchema.Required);
-        Assert.Contains("confirm", elicitParams.RequestedSchema.Required);
+        Assert.Contains("decision", elicitParams.RequestedSchema.Required);
     }
 
     [Fact]

core/Microsoft.Mcp.Core/src/Areas/Server/Commands/ToolLoading/BaseToolLoader.cs

@@ -192,21 +192,22 @@ protected McpClientOptions CreateClientOptions(McpServer server)
         {
             logger.LogInformation("Tool '{Tool}' handles sensitive data. Requesting user confirmation via elicitation.", toolName);
 
-            // Create the elicitation request with a confirmation checkbox
+            // Create the elicitation request with a single-select enum for approve/reject
             var protocolRequest = new ElicitRequestParams
             {
                 Message = $"⚠️ SECURITY WARNING: The tool '{toolName}' may expose secrets or sensitive information.\n\nThis operation could reveal confidential data such as passwords, API keys, certificates, or other sensitive values.\n\nDo you want to continue with this potentially sensitive operation?",
                 RequestedSchema = new()
                 {
                     Properties = new Dictionary<string, ElicitRequestParams.PrimitiveSchemaDefinition>
                     {
-                        ["confirm"] = new ElicitRequestParams.BooleanSchema
+                        ["decision"] = new ElicitRequestParams.UntitledSingleSelectEnumSchema
                         {
-                            Title = "Confirm",
-                            Description = "I confirm that I want to proceed with this sensitive operation."
+                            Title = "Decision",
+                            Description = "Approve or reject this sensitive operation.",
+                            Enum = ["Approve", "Reject"]
                         }
                     },
-                    Required = ["confirm"]
+                    Required = ["decision"]
                 }
             };