modelcontextprotocol/csharp-sdk
Watch
1
0
Fork
You've already forked csharp-sdk
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 1

Relax legacy request metadata validation (#1852)

Browse source 
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Tarek Mahmoud Sayed <10833894+tarekgh@users.noreply.github.com>
This commit is contained in:
Stephen Halter 2026-09-13 16:30:42 -07:00 • committed by GitHub
commit 324ccd83c3
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 780 additions and 391 deletions
Download patch file Download diff file Expand all files Collapse all files

14
tests/ModelContextProtocol.Tests/Server/TaskProtocolGatingTests.cs
View file

@ -123,23 +123,23 @@ public class TaskProtocolGatingTests : ClientServerTestBase
}
[Fact]
public async Task LegacyClient_CallToolRaw_WithForgedTaskOptIn_RejectsReservedMetadata()
public async Task LegacyClient_CallToolRaw_WithForgedTaskOptIn_IgnoresPerRequestCapability()
{
await using var client = await CreateMcpClientForServer(new McpClientOptions { ProtocolVersion = LatestStableVersion });
var ct = TestContext.Current.CancellationToken;
// Forge a SEP-2575 capabilities envelope carrying the tasks extension opt-in on a legacy
// request. The server rejects reserved per-request metadata before it can affect behavior.
var ex = await Assert.ThrowsAsync<McpProtocolException>(async () => await client.CallToolAsTaskAsync(
// A forward-compatible client may carry SEP-2575 capabilities on a legacy request. The
// metadata is tolerated, but it cannot opt the legacy session into modern-only tasks.
var result = await client.CallToolAsTaskAsync(
new CallToolRequestParams
{
Name = "test-tool",
Arguments = CreateArguments("input", "forged"),
Meta = CreateForgedTaskOptInMeta(),
}, ct));
}, ct);
Assert.Equal(McpErrorCode.InvalidRequest, ex.ErrorCode);
Assert.Contains(ClientCapabilitiesMetaKey, ex.Message);
Assert.False(result.IsTask);
Assert.NotNull(result.Result);
}
[Fact]