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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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19
src/ModelContextProtocol.Core/Client/McpClient.Methods.cs
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@ -1174,10 +1174,10 @@ public abstract partial class McpClient : McpSession
{
Name = requestParams.Name,
Arguments = requestParams.Arguments,
// The SEP-2663 Tasks extension is draft-only. On a legacy session, send a plain tools/call
// The SEP-2663 Tasks extension requires the 2026-07-28 or later protocol revision. On an older session, send a plain tools/call
// (no task capability envelope) so the server returns a direct CallToolResult and never
// creates a task.
Meta = IsDraftProtocol() ? GetMetaWithTaskCapability(requestParams.Meta) : requestParams.Meta,
Meta = IsJuly2026OrLaterProtocol() ? GetMetaWithTaskCapability(requestParams.Meta) : requestParams.Meta,
};
JsonRpcRequest jsonRpcRequest = new()
@ -1405,19 +1405,18 @@ public abstract partial class McpClient : McpSession
}
/// <summary>
/// Throws when the negotiated protocol version is not the draft revision. The SEP-2663 Tasks
/// extension is draft-only, and a task id only ever exists when the session negotiated draft, so
/// invoking <c>tasks/get</c>, <c>tasks/update</c>, or <c>tasks/cancel</c> on a legacy session is a
/// programming error rather than a recoverable protocol condition.
/// Throws when the negotiated protocol version does not support the SEP-2663 Tasks extension. Tasks
/// require the 2026-07-28 or later protocol revision, and a task id only ever exists when the session
/// negotiated such a revision, so invoking <c>tasks/get</c>, <c>tasks/update</c>, or <c>tasks/cancel</c>
/// on an older session is a programming error rather than a recoverable protocol condition.
/// </summary>
private void ThrowIfTasksNotSupported(string operationName)
{
if (!IsDraftProtocol())
if (!IsJuly2026OrLaterProtocol())
{
throw new InvalidOperationException(
$"'{operationName}' requires the draft protocol revision ('{DraftProtocolVersion}'). " +
$"The negotiated protocol version is '{NegotiatedProtocolVersion ?? "(none)"}'. " +
"The Tasks extension is only available under the draft revision.");
$"'{operationName}' requires a newer protocol revision that supports tasks. " +
$"The negotiated protocol version is '{NegotiatedProtocolVersion ?? "(none)"}'.");
}
}
}