From 1ba5df3e3bb3c9966ee46ebdff60f96b4afef9be Mon Sep 17 00:00:00 2001
From: Frank Yang <frank.ekn@gmail.com>
Date: Sun, 29 Mar 2026 16:12:44 +0800
Subject: [PATCH] fix(slack): gate disabled ack cleanup on delivery

---
 extensions/slack/src/monitor.tool-result.test.ts         | 2 ++
 extensions/slack/src/monitor/message-handler/dispatch.ts | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/extensions/slack/src/monitor.tool-result.test.ts b/extensions/slack/src/monitor.tool-result.test.ts
index d8564dde85e..2f2f5cdf77b 100644
--- a/extensions/slack/src/monitor.tool-result.test.ts
+++ b/extensions/slack/src/monitor.tool-result.test.ts
@@ -588,6 +588,8 @@ describe("monitorSlackProvider tool results", () => {
         channel_type: "channel",
       }),
     });
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    await flush();
 
     expect(sendMock).not.toHaveBeenCalled();
     expect(reactMock).toHaveBeenCalledTimes(1);
diff --git a/extensions/slack/src/monitor/message-handler/dispatch.ts b/extensions/slack/src/monitor/message-handler/dispatch.ts
index f348f477448..052757a9d35 100644
--- a/extensions/slack/src/monitor/message-handler/dispatch.ts
+++ b/extensions/slack/src/monitor/message-handler/dispatch.ts
@@ -692,7 +692,7 @@ export async function dispatchPreparedSlackMessage(prepared: PreparedSlackMessag
 
   if (!statusReactionsEnabled) {
     removeAckReactionAfterReply({
-      removeAfterReply: ctx.removeAckAfterReply,
+      removeAfterReply: ctx.removeAckAfterReply && anyReplyDelivered,
       ackReactionPromise: prepared.ackReactionPromise,
       ackReactionValue: prepared.ackReactionValue,
       remove: () =>