[dotnet-port] Populate MessageID from TaskStatusUpdateEvent.Status.Message in A2A agent

[github-actions]

Summary

When the Go A2A agent receives a TaskStatusUpdateEvent during streaming, ResponseUpdate.MessageID was always set to the TaskID. The upstream .NET fix (microsoft/agent-framework#6043) corrects this by using the message ID from Status.Message.MessageId when that message is present — providing accurate per-message correlation metadata instead of the task-level ID.

This PR ports that fix: MessageID is now populated from e.Status.Message.ID when the status update carries a message, falling back to string(e.TaskID) when no message is present (preserving the existing behavior for status events without a message).

Ported .NET PRs

• .NET: fix: populate MessageId from TaskStatusUpdateEvent in A2AAgent agent-framework#6043 — fix: populate MessageId from TaskStatusUpdateEvent.Status.Message

Upstream commit: abc9b60ec9943670a5dbe14d2a06a701b0475481

Breaking Changes

No. The fallback to TaskID preserves the existing behavior when Status.Message is nil.

Tests and Examples

• Updated agent/provider/a2aagent/a2a.go with the fix.
• Added TestRunStreamingWithTaskStatusUpdateEvent_WithMessage to agent/provider/a2aagent/a2a_test.go which verifies that MessageID is taken from Status.Message.ID when present, and that ResponseID remains the TaskID.
• Existing TestRunStreamingWithTaskStatusUpdateEvent continues to exercise the fallback path (no message in status).
• All tests pass: go test ./agent/provider/a2aagent/...

Notes

Other new upstream commits (793403f3 MCP long-running task support, 9fdd7429 Magentic orchestration sample) were reviewed but not ported: the MCP long-running task feature introduces new .NET-specific abstractions not present in the Go SDK, and the Magentic sample depends on orchestration infrastructure not yet fully present in Go.

Generated by .NET to Go Porting Agent · ● 12.1M · ◷

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Show patch preview (102 of 102 lines)

From 603e3a96d4bcca91d2d4b9410fbff2a4f285888b Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Sat, 23 May 2026 09:34:04 +0000
Subject: [PATCH] fix: populate MessageID from
 TaskStatusUpdateEvent.Status.Message

When the Go A2A agent receives a TaskStatusUpdateEvent during streaming,
ResponseUpdate.MessageID is now set from Status.Message.ID when the
message is present, falling back to the TaskID otherwise.

This aligns with the .NET fix in microsoft/agent-framework#6043.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 agent/provider/a2aagent/a2a.go      |  6 +++-
 agent/provider/a2aagent/a2a_test.go | 49 +++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/agent/provider/a2aagent/a2a.go b/agent/provider/a2aagent/a2a.go
index 33619973..ac273f14 100644
--- a/agent/provider/a2aagent/a2a.go
+++ b/agent/provider/a2aagent/a2a.go
@@ -179,10 +179,14 @@ func sendMsg(session *agent.Session, seq iter.Seq2[a2a.Event, error], yield func
 				return
 			}
 		case *a2a.TaskStatusUpdateEvent:
+			messageID := string(e.TaskID)
+			if e.Status.Message != nil {
+				messageID = e.Status.Message.ID
+			}
 			if !yield(&agent.ResponseUpdate{
 				RawRepresentation:    e,
 				AdditionalProperties: e.Metadata,
-				MessageID:            string(e.TaskID),
+				MessageID:            messageID,
 				ResponseID:           string(e.TaskID),
 				Role:                 message.RoleAssistant,
 				CreatedAt:            time.Now(),
diff --git a/agent/provider/a2aagent/a2a_test.go b/agent/provider/a2aagent/a2a_test.go
index 7b9ddec7..089e5b66 100644
--- a/agent/provider/a2aagent/a2a_test.go
+++ b/agent/provider/a2aagent/a2a_test.go
@@ -1338,6 +1338,55 @@ func TestRunStreamingWithTaskStatusUpdateEvent(t *testing.T) {
 	}
 }
 
+// TestRunStreamingWithTaskStatusUpdateEvent_WithMessage tests that MessageID is populated
+// from Status.Message.ID when the status update contains 
... (truncated)