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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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92
tests/Common/Utils/NodeHelpers.cs
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@ -2,6 +2,7 @@ using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.RegularExpressions;
using ModelContextProtocol.Protocol;
namespace ModelContextProtocol.Tests.Utils;
@ -187,8 +188,12 @@ public static class NodeHelpers
/// the pinned version in package.json) means this also returns <see langword="true"/>
/// when a newer private build has been installed locally via
/// <c>npm install --no-save &lt;path-to-conformance&gt;</c>.
/// Additionally requires that the installed conformance package emits the draft wire
/// version this SDK speaks — see <see cref="HasMatchingDraftWireVersion"/>.
/// </summary>
public static bool HasSep2243Scenarios() => HasInstalledConformanceVersionAtLeast(new Version(0, 2, 0));
public static bool HasSep2243Scenarios()
=> HasInstalledConformanceVersionAtLeast(new Version(0, 2, 0))
&& HasMatchingDraftWireVersion();
/// <summary>
/// Checks whether the SEP-2549 "caching" conformance scenario (added in conformance
@ -197,8 +202,47 @@ public static class NodeHelpers
/// Reading the installed version (rather than the pinned version in package.json) means
/// this also returns <see langword="true"/> when a newer private build has been installed
/// locally via <c>npm install --no-save &lt;path-to-conformance&gt;</c>.
/// Additionally requires that the installed conformance package emits the draft wire
/// version this SDK speaks — see <see cref="HasMatchingDraftWireVersion"/>.
/// </summary>
public static bool HasCachingScenario() => HasInstalledConformanceVersionAtLeast(new Version(0, 2, 0));
public static bool HasCachingScenario()
=> HasInstalledConformanceVersionAtLeast(new Version(0, 2, 0))
&& HasMatchingDraftWireVersion();
/// <summary>
/// Returns <see langword="true"/> when the installed conformance package's bundled
/// dist emits the same draft protocol version string as this SDK
/// (<see cref="McpHttpHeaders.DraftProtocolVersion"/>). Used to suppress draft-only
/// conformance scenarios when the published conformance binary is still pinned to a
/// stale wire string (for example, conformance 0.2.0-alpha.2 ships
/// <c>"DRAFT-2026-v1"</c> while this SDK speaks <c>"2026-07-28"</c>).
/// </summary>
/// <remarks>
/// This check is a pragmatic alternative to inspecting the conformance package's
/// internal constants: the bundled <c>dist/index.js</c> is minified so we can't grep
/// the constant name, but the literal version string survives bundling and is unique
/// enough to be a reliable signal.
/// </remarks>
public static bool HasMatchingDraftWireVersion()
{
try
{
var repoRoot = FindRepoRoot();
var distPath = Path.Combine(
repoRoot, "node_modules", "@modelcontextprotocol", "conformance", "dist", "index.js");
if (!File.Exists(distPath))
{
return false;
}
var bundled = File.ReadAllText(distPath);
return bundled.Contains(McpHttpHeaders.DraftProtocolVersion, StringComparison.Ordinal);
}
catch
{
return false;
}
}
/// <summary>
/// Returns <see langword="true"/> when the conformance package installed in node_modules
@ -373,42 +417,20 @@ public static class NodeHelpers
}
/// <summary>
/// Checks whether the SEP-2322 (Multi Round-Trip Requests / IncompleteResult)
/// conformance scenarios are available by reading the conformance package version
/// from the repo's package.json. MRTR scenarios require a conformance package version
/// that includes SEP-2322 support (see
/// Checks whether the SEP-2322 (Multi Round-Trip Requests / InputRequiredResult)
/// conformance scenarios are available, by reading the <em>installed</em> conformance
/// package version from node_modules. The <c>incomplete-result-*</c> scenarios were
/// introduced in conformance package 0.2.0 (see
/// https://github.com/modelcontextprotocol/conformance/pull/188).
/// Reading the installed version (rather than the pinned version in package.json) means
/// this also returns <see langword="true"/> when a newer private build has been installed
/// locally via <c>npm install --no-save &lt;path-to-conformance&gt;</c>.
/// Additionally requires that the installed conformance package emits the draft wire
/// version this SDK speaks — see <see cref="HasMatchingDraftWireVersion"/>.
/// </summary>
public static bool HasMrtrScenarios()
{
try
{
var repoRoot = FindRepoRoot();
var packageJsonPath = Path.Combine(repoRoot, "package.json");
if (!File.Exists(packageJsonPath))
{
return false;
}
var json = System.Text.Json.JsonDocument.Parse(File.ReadAllText(packageJsonPath));
if (json.RootElement.TryGetProperty("dependencies", out var deps) &&
deps.TryGetProperty("@modelcontextprotocol/conformance", out var versionElement))
{
var versionStr = versionElement.GetString();
if (versionStr is not null && Version.TryParse(versionStr, out var version))
{
// SEP-2322 scenarios are expected in conformance package >= 0.2.0
return version >= new Version(0, 2, 0);
}
}
return false;
}
catch
{
return false;
}
}
=> HasInstalledConformanceVersionAtLeast(new Version(0, 2, 0))
&& HasMatchingDraftWireVersion();
private static ProcessStartInfo NpmStartInfo(string arguments, string workingDirectory)
{