diff --git a/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts b/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts
index 7b94be57b411..f57b0f192c58 100644
--- a/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts
+++ b/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts
@@ -47,6 +47,8 @@ let mockedPinnedMainDmOwner: string | undefined;
 let capturedReplyOptions:
   | {
       disableBlockStreaming?: boolean;
+      sourceReplyDeliveryMode?: "automatic" | "message_tool_only";
+      suppressTyping?: boolean;
       suppressDefaultToolProgressMessages?: boolean;
       commentaryProgressEnabled?: boolean;
       onVerboseProgressVisibility?: (isActive: () => boolean) => void;
@@ -516,12 +518,15 @@ vi.mock("openclaw/plugin-sdk/channel-outbound", async (importOriginal) => {
     },
     resolveChannelMessageSourceReplyDeliveryMode: (params: {
       cfg?: { messages?: { groupChat?: { visibleReplies?: string } } };
-      ctx?: { ChatType?: string };
+      ctx?: { ChatType?: string; InboundEventKind?: string };
       requested?: "automatic" | "message_tool_only";
     }) => {
       if (params.requested) {
         return params.requested;
       }
+      if (params.ctx?.InboundEventKind === "room_event") {
+        return "message_tool_only";
+      }
       const chatType = params.ctx?.ChatType;
       if (chatType === "group" || chatType === "channel") {
         return params.cfg?.messages?.groupChat?.visibleReplies === "automatic"
@@ -978,6 +983,8 @@ vi.mock("../reply.runtime.js", () => ({
     };
     replyOptions?: {
       disableBlockStreaming?: boolean;
+      sourceReplyDeliveryMode?: "automatic" | "message_tool_only";
+      suppressTyping?: boolean;
       suppressDefaultToolProgressMessages?: boolean;
       onItemEvent?: (payload: {
         kind?: string;
@@ -1130,6 +1137,8 @@ vi.mock("../reply.runtime.js", () => ({
   dispatchInboundMessage: async (params: {
     replyOptions?: {
       disableBlockStreaming?: boolean;
+      sourceReplyDeliveryMode?: "automatic" | "message_tool_only";
+      suppressTyping?: boolean;
       suppressDefaultToolProgressMessages?: boolean;
       onAssistantMessageStart?: () => Promise<void> | void;
       onReasoningEnd?: () => Promise<void> | void;
@@ -2087,6 +2096,30 @@ describe("dispatchPreparedSlackMessage preview fallback", () => {
     expect(statusReactionControllerMock.setDone).not.toHaveBeenCalled();
   });
 
+  it("suppresses Slack typing for ambient room events", async () => {
+    await dispatchPreparedSlackMessage(
+      createPreparedSlackMessage({
+        cfg: { messages: { groupChat: { visibleReplies: "automatic" } } },
+        ctxPayload: { ChatType: "channel", InboundEventKind: "room_event" },
+      }),
+    );
+
+    expect(capturedReplyOptions?.sourceReplyDeliveryMode).toBe("message_tool_only");
+    expect(capturedReplyOptions?.suppressTyping).toBe(true);
+  });
+
+  it("leaves Slack typing unsuppressed for normal channel turns", async () => {
+    await dispatchPreparedSlackMessage(
+      createPreparedSlackMessage({
+        cfg: { messages: { groupChat: { visibleReplies: "automatic" } } },
+        ctxPayload: { ChatType: "channel" },
+      }),
+    );
+
+    expect(capturedReplyOptions?.sourceReplyDeliveryMode).toBe("automatic");
+    expect(capturedReplyOptions?.suppressTyping).toBeUndefined();
+  });
+
   it("escapes Slack mrkdwn in tool progress preview labels", async () => {
     const draftStream = createDraftStreamStub();
     createSlackDraftStreamMock.mockReturnValueOnce(draftStream);
diff --git a/extensions/slack/src/monitor/message-handler/dispatch.ts b/extensions/slack/src/monitor/message-handler/dispatch.ts
index cce570481b0c..e89a9c504dbe 100644
--- a/extensions/slack/src/monitor/message-handler/dispatch.ts
+++ b/extensions/slack/src/monitor/message-handler/dispatch.ts
@@ -503,6 +503,7 @@ export async function dispatchPreparedSlackMessage(prepared: PreparedSlackMessag
     ctx: prepared.ctxPayload,
   });
   const sourceRepliesAreToolOnly = sourceReplyDeliveryMode === "message_tool_only";
+  const suppressRoomEventTyping = prepared.ctxPayload.InboundEventKind === "room_event";
 
   // Shared context for the `message_sent` plugin hook emitted on each delivered
   // reply (both the `deliverReplies` paths and the native-streaming finalizer).
@@ -1904,6 +1905,9 @@ export async function dispatchPreparedSlackMessage(prepared: PreparedSlackMessag
       replyOptions: {
         skillFilter: prepared.channelConfig?.skills,
         sourceReplyDeliveryMode,
+        // Room events are observe-style turns; Slack status indicators imply an
+        // automatic visible reply and can auto-open assistant threads.
+        suppressTyping: suppressRoomEventTyping ? true : undefined,
         hasRepliedRef,
         disableBlockStreaming,
         onModelSelected,