Fix elicitation for Github Copilot CLI (#2214)

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

@@ -462,8 +462,15 @@ public class BaseToolLoaderTests
         Assert.NotNull(elicitParams.RequestedSchema.Properties);
         Assert.Single(elicitParams.RequestedSchema.Properties);
         Assert.True(elicitParams.RequestedSchema.Properties.ContainsKey("decision"));
-        var decisionSchema = Assert.IsType<ElicitRequestParams.UntitledSingleSelectEnumSchema>(elicitParams.RequestedSchema.Properties["decision"]);
-        Assert.Equal(["Approve", "Reject"], decisionSchema.Enum);
+        var decisionSchema = Assert.IsType<ElicitRequestParams.TitledSingleSelectEnumSchema>(elicitParams.RequestedSchema.Properties["decision"]);
+        Assert.Equal("Decision", decisionSchema.Title);
+        Assert.Equal("Approve or reject this sensitive operation.", decisionSchema.Description);
+        Assert.NotNull(decisionSchema.OneOf);
+        Assert.Equal(2, decisionSchema.OneOf.Count);
+        Assert.Equal("Approve", decisionSchema.OneOf[0].Title);
+        Assert.Equal("accept", decisionSchema.OneOf[0].Const);
+        Assert.Equal("Reject", decisionSchema.OneOf[1].Title);
+        Assert.Equal("reject", decisionSchema.OneOf[1].Const);
         Assert.NotNull(elicitParams.RequestedSchema.Required);
         Assert.Single(elicitParams.RequestedSchema.Required);
         Assert.Contains("decision", elicitParams.RequestedSchema.Required);

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

@@ -235,11 +235,15 @@ public abstract class BaseToolLoader(ILogger logger) : IToolLoader
                 {
                     Properties = new Dictionary<string, ElicitRequestParams.PrimitiveSchemaDefinition>
                     {
-                        ["decision"] = new ElicitRequestParams.UntitledSingleSelectEnumSchema
+                        ["decision"] = new ElicitRequestParams.TitledSingleSelectEnumSchema
                         {
                             Title = "Decision",
                             Description = "Approve or reject this sensitive operation.",
-                            Enum = ["Approve", "Reject"]
+                            OneOf = new List<ElicitRequestParams.EnumSchemaOption>
+                            {
+                                new() { Title = "Approve", Const = "accept" },
+                                new() { Title = "Reject", Const = "reject" }
+                            }
                         }
                     },
                     Required = ["decision"]

servers/Azure.Mcp.Server/changelog-entries/1774567876456.yaml

@@ -0,0 +1,3 @@
+changes:
+  - section: "Bugs Fixed"
+    description: "Fixed elicitation for GitHub Copilot CLI by updating from `UntitledSingleSelectEnumSchema` to `TitledSingleSelectEnumSchema`"