From d1ca874dd1be62014f5c11326f56ae82491cf188 Mon Sep 17 00:00:00 2001
From: Adam Weidman <adamfweidman@google.com>
Date: Thu, 12 Feb 2026 11:20:32 -0500
Subject: [PATCH] fix: deduplicate agent response text from task history

Task history contains multiple status-update messages that may
reference the same A2UI surface. Use only the last non-empty
agent response to avoid duplicate text in Chat output.
---
 .../a2a-server/src/chat-bridge/response-renderer.ts   | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/packages/a2a-server/src/chat-bridge/response-renderer.ts b/packages/a2a-server/src/chat-bridge/response-renderer.ts
index 123aca553a..8ceadce128 100644
--- a/packages/a2a-server/src/chat-bridge/response-renderer.ts
+++ b/packages/a2a-server/src/chat-bridge/response-renderer.ts
@@ -81,10 +81,13 @@ export function renderResponse(
     responseTexts.push(`_${thought.subject}_: ${thought.description}`);
   }
 
-  // Add agent response text (from A2UI surfaces)
-  for (const agentResponse of agentResponses) {
-    if (agentResponse.text) {
-      responseTexts.push(agentResponse.text);
+  // Add agent response text (from A2UI surfaces).
+  // Use only the last non-empty response since later updates supersede earlier
+  // ones for the same surface (history contains multiple status-update messages).
+  for (let i = agentResponses.length - 1; i >= 0; i--) {
+    if (agentResponses[i].text) {
+      responseTexts.push(agentResponses[i].text);
+      break;
     }
   }