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Add DeferChangedEvents() to McpServerPrimitiveCollection for batched change notifications (#1689)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jeffhandley <1031940+jeffhandley@users.noreply.github.com>
Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Copilot 2026-07-07 15:15:45 -04:00 • committed by GitHub
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44
tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsResourcesTests.cs
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@ -207,6 +207,50 @@ public partial class McpServerBuilderExtensionsResourcesTests : ClientServerTest
Assert.DoesNotContain(resources, t => t.Name == "NewResource");
}
[Fact]
public async Task DeferChangedEvents_BatchAddResources_EmitsExactlyOneNotification()
{
// Under the 2026-07-28 protocol, list-changed notifications are delivered only over a
// subscriptions/listen stream. Pin the legacy revision to test the session-wide broadcast.
await using McpClient client = await CreateMcpClientForServer(new McpClientOptions
{
ProtocolVersion = McpHttpHeaders.November2025ProtocolVersion,
});
var serverOptions = ServiceProvider.GetRequiredService<IOptions<McpServerOptions>>().Value;
var serverResources = serverOptions.ResourceCollection;
Assert.NotNull(serverResources);
int notificationCount = 0;
var firstNotification = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
await using (client.RegisterNotificationHandler(NotificationMethods.ResourceListChangedNotification, (notification, cancellationToken) =>
{
if (Interlocked.Increment(ref notificationCount) == 1)
{
firstNotification.TrySetResult(true);
}
return default;
}))
{
using (serverResources.DeferChangedEvents())
{
serverResources.Add(McpServerResource.Create([McpServerResource(Name = "BatchResource1", UriTemplate = "test://batch1")] () => "1"));
serverResources.Add(McpServerResource.Create([McpServerResource(Name = "BatchResource2", UriTemplate = "test://batch2")] () => "2"));
serverResources.Add(McpServerResource.Create([McpServerResource(Name = "BatchResource3", UriTemplate = "test://batch3")] () => "3"));
}
await firstNotification.Task.WaitAsync(TestContext.Current.CancellationToken);
// Do a round-trip so that any second (erroneous) notification has time to arrive.
var resources = await client.ListResourcesAsync(cancellationToken: TestContext.Current.CancellationToken);
Assert.Contains(resources, t => t.Name == "BatchResource1");
Assert.Contains(resources, t => t.Name == "BatchResource2");
Assert.Contains(resources, t => t.Name == "BatchResource3");
Assert.Equal(1, notificationCount);
}
}
[Fact]
public async Task AttributeProperties_Propagated()
{