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Default draft protocol support: sessionless + handshake-less (SEP-2575 + SEP-2567) (#1610)

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Stephen Halter 2026-06-23 21:24:22 -07:00 • committed by GitHub
commit 6c323e783b
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1 changed files with 5704 additions and 712 deletions
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20
tests/ModelContextProtocol.AspNetCore.Tests/MapMcpTests.cs
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@ -111,7 +111,10 @@ public abstract partial class MapMcpTests(ITestOutputHelper testOutputHelper) :
await app.StartAsync(TestContext.Current.CancellationToken);
var httpRequestException = await Assert.ThrowsAsync<HttpRequestException>(() => ConnectAsync());
// Session-scoped user validation across requests is a legacy stateful-session behavior; the
// draft revision is sessionless. Pin to the latest stable version to keep covering it.
var httpRequestException = await Assert.ThrowsAsync<HttpRequestException>(
() => ConnectAsync(configureClient: options => options.ProtocolVersion = "2025-11-25"));
Assert.Equal(HttpStatusCode.Forbidden, httpRequestException.StatusCode);
}
@ -159,6 +162,10 @@ public abstract partial class MapMcpTests(ITestOutputHelper testOutputHelper) :
var sampleCount = 0;
await using var mcpClient = await ConnectAsync(configureClient: options =>
{
// Server->client sampling over the open response stream is a stateful-session behavior.
// Under draft, Streamable HTTP is forced sessionless, so the implicit-MRTR suspend path
// doesn't apply over HTTP (draft sampling is covered by the stdio MRTR tests). Pin legacy.
options.ProtocolVersion = "2025-11-25";
options.Handlers.SamplingHandler = async (parameters, _, _) =>
{
Assert.NotNull(parameters?.Messages);
@ -319,7 +326,13 @@ public abstract partial class MapMcpTests(ITestOutputHelper testOutputHelper) :
new Dictionary<string, object?> { ["message"] = "hi" },
cancellationToken: TestContext.Current.CancellationToken);
Assert.Contains(RequestMethods.Initialize, observedMethods);
// The client now defaults to the draft revision, whose handshake is server/discover
// rather than the legacy initialize request. On the stateful Streamable HTTP fixture the
// sessionless draft request is refused, so the client downgrades to the legacy initialize.
var expectedHandshakeMethod = UseStreamableHttp && !Stateless
? RequestMethods.Initialize
: RequestMethods.ServerDiscover;
Assert.Contains(expectedHandshakeMethod, observedMethods);
Assert.Contains(RequestMethods.ToolsList, observedMethods);
Assert.Contains(RequestMethods.ToolsCall, observedMethods);
}
@ -373,6 +386,9 @@ public abstract partial class MapMcpTests(ITestOutputHelper testOutputHelper) :
await using var client = await ConnectAsync(configureClient: opts =>
{
// Server-originated sampling requests and the initialize response are legacy stateful
// behaviors; the draft revision routes sampling through MRTR and drops initialize.
opts.ProtocolVersion = "2025-11-25";
opts.Capabilities = clientOptions.Capabilities;
opts.Handlers = clientOptions.Handlers;
});