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Implement SEP-2663 Tasks Extension (#1579)

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pranav Senthilnathan 2026-06-11 13:10:45 -07:00 • committed by GitHub
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37
src/ModelContextProtocol.Core/Protocol/NotificationMethods.cs
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@ -143,39 +143,12 @@ public static class NotificationMethods
public const string CancelledNotification = "notifications/cancelled";
/// <summary>
/// The name of the notification sent when a task status changes.
/// The name of the notification sent by the server to push task status updates to subscribed clients.
/// </summary>
/// <remarks>
/// <para>
/// When a task status changes, receivers may send this notification to inform the requestor
/// of the change. This notification includes the full task state.
/// </para>
/// <para>
/// Requestors must not rely on receiving this notification, as it is optional. Receivers
/// are not required to send status notifications and may choose to only send them for
/// certain status transitions. Requestors should continue to poll via tasks/get to ensure
/// they receive status updates.
/// </para>
/// Part of the <c>io.modelcontextprotocol/tasks</c> extension.
/// Each notification carries a complete task state for the current status, identical to what
/// <c>tasks/get</c> would have returned at that moment.
/// </remarks>
public const string TaskStatusNotification = "notifications/tasks/status";
/// <summary>
/// The metadata key used to associate requests, responses, and notifications with a task.
/// </summary>
/// <remarks>
/// <para>
/// This constant defines the key <c>"io.modelcontextprotocol/related-task"</c> used in the
/// <c>_meta</c> field to associate messages with their originating task across the entire
/// request lifecycle.
/// </para>
/// <para>
/// For example, an elicitation that a task-augmented tool call depends on must share the
/// same related task ID with that tool call's task.
/// </para>
/// <para>
/// For <c>tasks/get</c>, <c>tasks/list</c>, and <c>tasks/cancel</c> operations, this
/// metadata should not be included as the taskId is already present in the message structure.
/// </para>
/// </remarks>
public const string RelatedTaskMetaKey = "io.modelcontextprotocol/related-task";
public const string TaskStatusNotification = "notifications/tasks";
}