[dotnet-code] Consolidate A2A response update creation

[github-actions]

Summary

Consolidates A2A provider streaming response-update construction behind a small unexported helper. This keeps the provider-specific mapping to agent.ResponseUpdate in one place, making future .NET-to-Go ports easier to compare against the .NET response update model without changing runtime behavior.

.NET Reference

• dotnet/src/Microsoft.Agents.AI.Abstractions/AgentResponseUpdate.cs - defines the common response-update shape that provider adapters populate.

Public API and Behavior

No public Go API changed. No intentional behavior change was made.

Tests

• go test ./agent/provider/a2aagent

Notes

Rejected candidates:

• dotnet/src/Microsoft.Agents.AI/Compaction/CompactionProvider.cs / Go agent/compaction: Go already has a narrow Compact helper and further provider changes risked churn for little structural gain.
• dotnet/src/Microsoft.Agents.AI.Workflows/SuperStepStartInfo.cs / Go workflow/event.go: the corresponding Go type is public, so reshaping it would risk public API churn.
• dotnet/src/Microsoft.Agents.AI.Workflows/Observability/WorkflowTelemetryContext.cs / Go workflow observability: the Go telemetry bridge is already compact, and shared workflow runtime changes looked riskier than this A2A-local cleanup.

Generated by .NET-to-Go Code Portability Refactoring Agent · 371.7 AIC · ⌖ 30.8 AIC · ⊞ 20.8K · ◷

---

Note

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The changes have been pushed to branch dotnet-code-a2a-response-update-helper-6794454b255b38d9.

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Show patch preview (110 of 110 lines)

From 6c96a6ffd551f91752cb6f19128af24592c5afb1 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Wed, 24 Jun 2026 22:49:52 +0000
Subject: [PATCH] Consolidate A2A response update creation

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 agent/provider/a2aagent/a2a.go | 57 +++++++++++++---------------------
 1 file changed, 21 insertions(+), 36 deletions(-)

diff --git a/agent/provider/a2aagent/a2a.go b/agent/provider/a2aagent/a2a.go
index 9179c8721..c7bf7be43 100644
--- a/agent/provider/a2aagent/a2a.go
+++ b/agent/provider/a2aagent/a2a.go
@@ -194,15 +194,8 @@ func sendMsg(session *agent.Session, seq iter.Seq2[a2a.Event, error], yield func
 					}
 				}
 			}
-			if !yield(&agent.ResponseUpdate{
-				RawRepresentation:    e,
-				AdditionalProperties: e.Metadata,
-				MessageID:            messageID,
-				ResponseID:           string(e.TaskID),
-				Role:                 message.RoleAssistant,
-				Contents:             contents,
-				CreatedAt:            time.Now(),
-			}, nil) {
+			update := newResponseUpdate(e, e.Metadata, string(e.TaskID), messageID, message.RoleAssistant, contents, time.Now())
+			if !yield(update, nil) {
 				return
 			}
 		case *a2a.TaskArtifactUpdateEvent:
@@ -211,15 +204,8 @@ func sendMsg(session *agent.Session, seq iter.Seq2[a2a.Event, error], yield func
 				yield(nil, err)
 				return
 			}
-			if !yield(&agent.ResponseUpdate{
-				RawRepresentation:    e,
-				AdditionalProperties: e.Metadata,
-				MessageID:            string(e.Artifact.ID),
-				ResponseID:           string(e.TaskID),
-				Contents:             contents,
-				Role:                 message.RoleAssistant,
-				CreatedAt:            time.Now(),
-			}, nil) {
+			update := newResponseUpdate(e, e.Metadata, string(e.TaskID), string(e.Artifact.ID), message.RoleAssistant, contents, time.Now())
+			if !yield(update, nil) {
 				return
 			}
 		case *a2a.Message:
@@ -232,15 +218,8 @@ func sendMsg
... (truncated)