Add SchemaCreateOptions in McpServerToolCreateOptions/McpServerPromptCreateOptions (#354)

* Add SchemaCreateOptions in McpServerToolCreateOptions

* Use TransformSchemaNode for SchemaCreateOptions testing

* Add SchemaCreateOptions in McpServerPromptCreateOptions also

src/ModelContextProtocol/Server/AIFunctionMcpServerPrompt.cs

@@ -130,6 +130,7 @@ internal sealed class AIFunctionMcpServerPrompt : McpServerPrompt
                     return null;
                 }
             },
+            JsonSchemaCreateOptions = options?.SchemaCreateOptions,
         };
 
     /// <summary>Creates an <see cref="McpServerPrompt"/> that wraps the specified <see cref="AIFunction"/>.</summary>

src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs

@@ -151,6 +151,7 @@ internal sealed class AIFunctionMcpServerTool : McpServerTool
                     return null;
                 }
             },
+            JsonSchemaCreateOptions = options?.SchemaCreateOptions,
         };
 
     /// <summary>Creates an <see cref="McpServerTool"/> that wraps the specified <see cref="AIFunction"/>.</summary>

src/ModelContextProtocol/Server/McpServerPromptCreateOptions.cs

@@ -1,3 +1,4 @@
+using Microsoft.Extensions.AI;
 using ModelContextProtocol.Utils.Json;
 using System.ComponentModel;
 using System.Text.Json;
@@ -55,6 +56,14 @@ public sealed class McpServerPromptCreateOptions
     /// </remarks>
     public JsonSerializerOptions? SerializerOptions { get; set; }
 
+    /// <summary>
+    /// Gets or sets the JSON schema options when creating <see cref="AIFunction"/> from a method.
+    /// </summary>
+    /// <remarks>
+    /// Defaults to <see cref="AIJsonSchemaCreateOptions.Default"/> if left unspecified.
+    /// </remarks>
+    public AIJsonSchemaCreateOptions? SchemaCreateOptions { get; set; }
+
     /// <summary>
     /// Creates a shallow clone of the current <see cref="McpServerPromptCreateOptions"/> instance.
     /// </summary>
@@ -65,5 +74,6 @@ public sealed class McpServerPromptCreateOptions
             Name = Name,
             Description = Description,
             SerializerOptions = SerializerOptions,
+            SchemaCreateOptions = SchemaCreateOptions,
         };
 }

src/ModelContextProtocol/Server/McpServerToolCreateOptions.cs

@@ -1,3 +1,4 @@
+using Microsoft.Extensions.AI;
 using ModelContextProtocol.Utils.Json;
 using System.ComponentModel;
 using System.Text.Json;
@@ -132,6 +133,14 @@ public sealed class McpServerToolCreateOptions
     /// </remarks>
     public JsonSerializerOptions? SerializerOptions { get; set; }
 
+    /// <summary>
+    /// Gets or sets the JSON schema options when creating <see cref="AIFunction"/> from a method.
+    /// </summary>
+    /// <remarks>
+    /// Defaults to <see cref="AIJsonSchemaCreateOptions.Default"/> if left unspecified.
+    /// </remarks>
+    public AIJsonSchemaCreateOptions? SchemaCreateOptions { get; set; }
+
     /// <summary>
     /// Creates a shallow clone of the current <see cref="McpServerToolCreateOptions"/> instance.
     /// </summary>
@@ -147,5 +156,6 @@ public sealed class McpServerToolCreateOptions
             OpenWorld = OpenWorld,
             ReadOnly = ReadOnly,
             SerializerOptions = SerializerOptions,
+            SchemaCreateOptions = SchemaCreateOptions,
         };
 }

tests/ModelContextProtocol.Tests/Server/McpServerPromptTests.cs

@@ -3,7 +3,9 @@ using Microsoft.Extensions.DependencyInjection;
 using ModelContextProtocol.Protocol.Types;
 using ModelContextProtocol.Server;
 using Moq;
+using System.ComponentModel;
 using System.Reflection;
+using System.Text.Json;
 
 namespace ModelContextProtocol.Tests.Server;
 
@@ -316,6 +318,30 @@ public class McpServerPromptTests
             TestContext.Current.CancellationToken));
     }
 
+    [Fact]
+    public async Task SupportsSchemaCreateOptions()
+    {
+        AIJsonSchemaCreateOptions schemaCreateOptions = new()
+        {
+            TransformSchemaNode = (context, node) =>
+            {
+                node["description"] = "1234";
+                return node;
+            }
+        };
+
+        McpServerPrompt prompt = McpServerPrompt.Create(([Description("argument1")] int num, [Description("argument2")] string str) =>
+        {
+            return new ChatMessage(ChatRole.User, "Hello");
+        }, new() { SchemaCreateOptions = schemaCreateOptions });
+
+        Assert.NotNull(prompt.ProtocolPrompt.Arguments);
+        Assert.All(
+            prompt.ProtocolPrompt.Arguments,
+            x => Assert.Equal("1234", x.Description)
+        );
+    }
+
     private sealed class MyService;
 
     private class DisposablePromptType : IDisposable

tests/ModelContextProtocol.Tests/Server/McpServerToolTests.cs

@@ -355,6 +355,29 @@ public partial class McpServerToolTests
         Assert.Equal("image", result.Content[1].Type);
     }
 
+    [Fact]
+    public async Task SupportsSchemaCreateOptions()
+    {
+        AIJsonSchemaCreateOptions schemaCreateOptions = new ()
+        {
+            TransformSchemaNode = (context, node) =>
+            {
+                node["text"] = "1234";
+                return node;
+            },
+        };
+
+        McpServerTool tool = McpServerTool.Create((int num, string str) =>
+        {
+            return "42";
+        }, new() { SchemaCreateOptions = schemaCreateOptions });
+
+        Assert.All(
+            tool.ProtocolTool.InputSchema.GetProperty("properties").EnumerateObject(),
+            x => Assert.True(x.Value.TryGetProperty("text", out JsonElement value) && value.ToString() == "1234")
+        );
+    }
+
     private sealed class MyService;
 
     private class DisposableToolType : IDisposable