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Follow-ups to #1610: de-draft 2026-07-28 terminology, renumber error codes, ProtocolVersion floor (#1671)

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Stephen Halter 2026-06-25 14:07:52 -07:00 • committed by GitHub
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33
tests/ModelContextProtocol.Tests/Server/RawStreamConformanceTests.cs
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@ -1,4 +1,4 @@
#if !NET472
#if !NET472
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using ModelContextProtocol.Protocol;
@ -14,7 +14,7 @@ namespace ModelContextProtocol.Tests.Server;
/// <summary>
/// Wire-format conformance tests for <see cref="McpServer"/> driven directly against the underlying
/// stream — without going through <see cref="ModelContextProtocol.Client.McpClient"/>. This exercises the
/// SEP-2575 (sessionless / no-initialize) and SEP-2567 (server/discover) flows by hand-crafting JSON-RPC
/// SEP-2575 (no initialize handshake) and SEP-2567 (server/discover, no session id) flows by hand-crafting JSON-RPC
/// messages and asserting on the exact responses the server emits.
/// </summary>
/// <remarks>
@ -24,7 +24,6 @@ namespace ModelContextProtocol.Tests.Server;
/// </remarks>
public sealed class RawStreamConformanceTests : LoggedTest, IAsyncDisposable
{
private const string DraftVersion = McpHttpHeaders.DraftProtocolVersion;
private readonly Pipe _clientToServer = new();
private readonly Pipe _serverToClient = new();
@ -77,15 +76,15 @@ public sealed class RawStreamConformanceTests : LoggedTest, IAsyncDisposable
return JsonNode.Parse(line!)!;
}
private static string DraftMetaFragment(string protocolVersion = DraftVersion) =>
private static string July2026ProtocolMetaFragment(string protocolVersion = McpHttpHeaders.July2026ProtocolVersion) =>
@"""_meta"":{""io.modelcontextprotocol/protocolVersion"":""" + protocolVersion +
@""",""io.modelcontextprotocol/clientInfo"":{""name"":""raw"",""version"":""1.0""}," +
@"""io.modelcontextprotocol/clientCapabilities"":{}}";
[Fact]
public async Task ServerDiscover_ReturnsSupportedVersionsIncludingDraft()
public async Task ServerDiscover_ReturnsSupportedVersionsIncludingJuly2026Protocol()
{
await SendAsync(@"{""jsonrpc"":""2.0"",""id"":1,""method"":""server/discover"",""params"":{" + DraftMetaFragment() + "}}");
await SendAsync(@"{""jsonrpc"":""2.0"",""id"":1,""method"":""server/discover"",""params"":{" + July2026ProtocolMetaFragment() + "}}");
var response = await ReadAsync();
Assert.Equal("2.0", response["jsonrpc"]!.GetValue<string>());
@ -97,7 +96,7 @@ public sealed class RawStreamConformanceTests : LoggedTest, IAsyncDisposable
var supportedVersions = result!["supportedVersions"]!.AsArray()
.Select(n => n!.GetValue<string>())
.ToList();
Assert.Contains(DraftVersion, supportedVersions);
Assert.Contains(McpHttpHeaders.July2026ProtocolVersion, supportedVersions);
// Capabilities and serverInfo are mandatory in DiscoverResult per SEP-2575.
Assert.NotNull(result["capabilities"]);
@ -112,13 +111,13 @@ public sealed class RawStreamConformanceTests : LoggedTest, IAsyncDisposable
}
[Fact]
public async Task DraftToolsCall_WithoutInitialize_Succeeds_WhenFullMetaProvided()
public async Task July2026ProtocolToolsCall_WithoutInitialize_Succeeds_WhenFullMetaProvided()
{
// Spec: under SEP-2575 the client may skip server/discover and go straight to a normal RPC, as long
// as every request carries the full _meta envelope with protocolVersion, clientInfo and capabilities.
await SendAsync(
@"{""jsonrpc"":""2.0"",""id"":42,""method"":""tools/call"",""params"":{""name"":""echo"",""arguments"":{""text"":""hello""}," +
DraftMetaFragment() + "}}");
July2026ProtocolMetaFragment() + "}}");
var response = await ReadAsync();
Assert.Equal(42, response["id"]!.GetValue<int>());
@ -130,12 +129,12 @@ public sealed class RawStreamConformanceTests : LoggedTest, IAsyncDisposable
}
[Fact]
public async Task DraftRequest_WithUnsupportedProtocolVersion_ReturnsMinus32004WithSupported()
public async Task July2026ProtocolRequest_WithUnsupportedProtocolVersion_ReturnsMinus32022WithSupported()
{
// Server should respond with UnsupportedProtocolVersionError (-32004) and a data.supported[] list.
// Server should respond with UnsupportedProtocolVersionError (-32022) and a data.supported[] list.
await SendAsync(
@"{""jsonrpc"":""2.0"",""id"":7,""method"":""tools/call"",""params"":{""name"":""echo"",""arguments"":{""text"":""x""}," +
DraftMetaFragment("9999-99-99") + "}}");
July2026ProtocolMetaFragment("9999-99-99") + "}}");
var response = await ReadAsync();
Assert.Equal(7, response["id"]!.GetValue<int>());
@ -147,13 +146,13 @@ public sealed class RawStreamConformanceTests : LoggedTest, IAsyncDisposable
Assert.NotNull(data);
Assert.Equal("9999-99-99", data!["requested"]!.GetValue<string>());
var supported = data["supported"]!.AsArray().Select(n => n!.GetValue<string>()).ToList();
Assert.Contains(DraftVersion, supported);
Assert.Contains(McpHttpHeaders.July2026ProtocolVersion, supported);
}
[Fact]
public async Task LegacyInitialize_StillWorks_OnDraftDefaultServer()
public async Task LegacyInitialize_StillWorks_OnJuly2026ProtocolDefaultServer()
{
// Dual-era: a draft-default server (ProtocolVersion = DraftVersion in McpServerOptions) must still
// Dual-era: a server defaulting to the 2026-07-28 protocol (ProtocolVersion = McpHttpHeaders.July2026ProtocolVersion in McpServerOptions) must still
// accept the legacy initialize handshake from clients that don't speak the new protocol.
await SendAsync(@"{""jsonrpc"":""2.0"",""id"":1,""method"":""initialize"",""params"":{""protocolVersion"":""2025-11-25"",""capabilities"":{},""clientInfo"":{""name"":""legacy"",""version"":""1.0""}}}");
@ -167,9 +166,9 @@ public sealed class RawStreamConformanceTests : LoggedTest, IAsyncDisposable
[Fact]
public async Task MixedSequence_Discover_Then_Initialize_Then_ToolsCall_AllSucceed()
{
// Dual-era servers must accept draft and legacy traffic on the same connection. The exact mix below
// Dual-era servers must accept 2026-07-28 and legacy traffic on the same connection. The exact mix below
// is what a permissive client running against an unknown server would emit while probing.
await SendAsync(@"{""jsonrpc"":""2.0"",""id"":1,""method"":""server/discover"",""params"":{" + DraftMetaFragment() + "}}");
await SendAsync(@"{""jsonrpc"":""2.0"",""id"":1,""method"":""server/discover"",""params"":{" + July2026ProtocolMetaFragment() + "}}");
var discover = await ReadAsync();
Assert.NotNull(discover["result"]);