Use WithResources in EverythingServer sample (#400)

Author: stephentoub

samples/EverythingServer/Program.cs

@@ -1,5 +1,6 @@
 using EverythingServer;
 using EverythingServer.Prompts;
+using EverythingServer.Resources;
 using EverythingServer.Tools;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.DependencyInjection;
@@ -14,8 +15,6 @@
 using OpenTelemetry.Resources;
 using OpenTelemetry.Trace;
 
-#pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
-
 var builder = Host.CreateApplicationBuilder(args);
 builder.Logging.AddConsole(consoleLogOptions =>
 {
@@ -38,82 +37,7 @@
     .WithTools<TinyImageTool>()
     .WithPrompts<ComplexPromptType>()
     .WithPrompts<SimplePromptType>()
-    .WithListResourcesHandler(async (ctx, ct) =>
-    {
-        return new ListResourcesResult
-        {
-            Resources =
-            [
-                new ModelContextProtocol.Protocol.Types.Resource { Name = "Direct Text Resource", Description = "A direct text resource", MimeType = "text/plain", Uri = "test://direct/text/resource" },
-            ]
-        };
-    })
-    .WithListResourceTemplatesHandler(async (ctx, ct) =>
-    {
-        return new ListResourceTemplatesResult
-        {
-            ResourceTemplates =
-            [
-                new ResourceTemplate { Name = "Template Resource", Description = "A template resource with a numeric ID", UriTemplate = "test://template/resource/{id}" }
-            ]
-        };
-    })
-    .WithReadResourceHandler(async (ctx, ct) =>
-    {
-        var uri = ctx.Params?.Uri;
-
-        if (uri == "test://direct/text/resource")
-        {
-            return new ReadResourceResult
-            {
-                Contents = [new TextResourceContents
-                {
-                    Text = "This is a direct resource",
-                    MimeType = "text/plain",
-                    Uri = uri,
-                }]
-            };
-        }
-
-        if (uri is null || !uri.StartsWith("test://template/resource/"))
-        {
-            throw new NotSupportedException($"Unknown resource: {uri}");
-        }
-
-        int index = int.Parse(uri["test://template/resource/".Length..]) - 1;
-
-        if (index < 0 || index >= ResourceGenerator.Resources.Count)
-        {
-            throw new NotSupportedException($"Unknown resource: {uri}");
-        }
-
-        var resource = ResourceGenerator.Resources[index];
-
-        if (resource.MimeType == "text/plain")
-        {
-            return new ReadResourceResult
-            {
-                Contents = [new TextResourceContents
-                {
-                    Text = resource.Description!,
-                    MimeType = resource.MimeType,
-                    Uri = resource.Uri,
-                }]
-            };
-        }
-        else
-        {
-            return new ReadResourceResult
-            {
-                Contents = [new BlobResourceContents
-                {
-                    Blob = resource.Description!,
-                    MimeType = resource.MimeType,
-                    Uri = resource.Uri,
-                }]
-            };
-        }
-    })
+    .WithResources<SimpleResourceType>()
     .WithSubscribeToResourcesHandler(async (ctx, ct) =>
     {
         var uri = ctx.Params?.Uri;

samples/EverythingServer/Resources/SimpleResourceType.cs

@@ -0,0 +1,39 @@
+using ModelContextProtocol.Protocol.Types;
+using ModelContextProtocol.Server;
+using System.ComponentModel;
+
+namespace EverythingServer.Resources;
+
+[McpServerResourceType]
+public class SimpleResourceType
+{
+    [McpServerResource(UriTemplate = "test://direct/text/resource", Name = "Direct Text Resource", MimeType = "text/plain")]
+    [Description("A direct text resource")]
+    public static string DirectTextResource() => "This is a direct resource";
+
+    [McpServerResource(UriTemplate = "test://template/resource/{id}", Name = "Template Resource")]
+    [Description("A template resource with a numeric ID")]
+    public static ResourceContents TemplateResource(RequestContext<ReadResourceRequestParams> requestContext, int id)
+    {
+        int index = id - 1;
+        if ((uint)index >= ResourceGenerator.Resources.Count)
+        {
+            throw new NotSupportedException($"Unknown resource: {requestContext.Params?.Uri}");
+        }
+
+        var resource = ResourceGenerator.Resources[index];
+        return resource.MimeType == "text/plain" ?
+            new TextResourceContents
+            {
+                Text = resource.Description!,
+                MimeType = resource.MimeType,
+                Uri = resource.Uri,
+            } :
+            new BlobResourceContents
+            {
+                Blob = resource.Description!,
+                MimeType = resource.MimeType,
+                Uri = resource.Uri,
+            };
+    }
+}