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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
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1 changed files with 5704 additions and 712 deletions
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13
tests/ModelContextProtocol.Tests/Client/McpClientTests.cs
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@ -584,15 +584,16 @@ public class McpClientTests : ClientServerTestBase
public async Task ReturnsNegotiatedProtocolVersion(string? protocolVersion)
{
await using McpClient client = await CreateMcpClientForServer(new() { ProtocolVersion = protocolVersion });
Assert.Equal(protocolVersion ?? "2025-11-25", client.NegotiatedProtocolVersion);
// A null ProtocolVersion now prefers the draft revision, which the reactive test server advertises.
Assert.Equal(protocolVersion ?? "2026-07-28", client.NegotiatedProtocolVersion);
}
[Fact]
public async Task ReturnsNegotiatedProtocolVersion_WithExperimentalProtocol()
{
Server.ServerOptions.ProtocolVersion = "DRAFT-2026-v1";
await using McpClient client = await CreateMcpClientForServer(new() { ProtocolVersion = "DRAFT-2026-v1" });
Assert.Equal("DRAFT-2026-v1", client.NegotiatedProtocolVersion);
Server.ServerOptions.ProtocolVersion = "2026-07-28";
await using McpClient client = await CreateMcpClientForServer(new() { ProtocolVersion = "2026-07-28" });
Assert.Equal("2026-07-28", client.NegotiatedProtocolVersion);
}
[Fact]
@ -794,7 +795,9 @@ public class McpClientTests : ClientServerTestBase
[Fact]
public async Task ServerCanPingClient()
{
await using McpClient client = await CreateMcpClientForServer();
// ping is a legacy-only RPC (removed in the draft revision per SEP-2575), so pin the client
// to a legacy protocol version to exercise the server-initiated ping round-trip.
await using McpClient client = await CreateMcpClientForServer(new() { ProtocolVersion = "2025-11-25" });
var pingRequest = new JsonRpcRequest { Method = RequestMethods.Ping };
var response = await Server.SendRequestAsync(pingRequest, TestContext.Current.CancellationToken);