diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf4858f22b1..55b4cb6295d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -66,6 +66,7 @@ Docs: https://docs.openclaw.ai
 - WhatsApp/onboarding: canonicalize setup and pairing allowlist entries to WhatsApp's digit-only phone ids while still accepting E.164, JID, and `whatsapp:` inputs, so personal-phone allowlists match WhatsApp Web sender ids after setup. Thanks @vincentkoc.
 - Gateway/startup: load provider plugins that own explicitly configured image, video, or music generation defaults so generation tools become live after gateway restart instead of remaining catalog-only. Fixes #77244. Thanks @buyuangtampan, @Nikoxx99, and @vincentkoc.
 - Slack/subagents: keep resumed parent `message.send` calls in the originating Slack thread when ambient session thread context is present, and suppress successful silent child completion rows from follow-up findings. Thanks @bek91.
+- Slack/mentions: record thread participation for successful visible threaded Slack sends, including message-tool and media delivery paths, so unmentioned replies in bot-participated threads can bypass mention gating as documented. Fixes #77648. Thanks @bek91.
 - Infra/Windows: skip the POSIX `/tmp/openclaw` preferred path on Windows in `resolvePreferredOpenClawTmpDir` so log files, TTS temp files, and other writes land in `%TEMP%\openclaw-<uid>` instead of `C:\tmp\openclaw`. Fixes #60713. Thanks @juan-flores077.
 - Gateway/diagnostics: make stuck-session recovery outcome-driven and generation-guarded, add `diagnostics.stuckSessionAbortMs`, and emit structured recovery requested/completed events so stale or skipped recovery no longer looks like a successful abort.
 - Media/Windows: open saved attachment temp files read/write before fsync so Windows WebChat and `chat.send` media offloads no longer fail with EPERM during durability flush. (#76593) Thanks @qq230849622-a11y.
diff --git a/extensions/slack/src/action-runtime.test.ts b/extensions/slack/src/action-runtime.test.ts
index cc0dcac4e70..ff7a8423cea 100644
--- a/extensions/slack/src/action-runtime.test.ts
+++ b/extensions/slack/src/action-runtime.test.ts
@@ -16,7 +16,6 @@ const reactSlackMessage = vi.fn(async (..._args: unknown[]) => ({}));
 const readSlackMessages = vi.fn(async (..._args: unknown[]) => ({}));
 const removeOwnSlackReactions = vi.fn(async (..._args: unknown[]) => ["thumbsup"]);
 const removeSlackReaction = vi.fn(async (..._args: unknown[]) => ({}));
-const recordSlackThreadParticipation = vi.fn();
 const sendSlackMessage = vi.fn(async (..._args: unknown[]) => ({ channelId: "C123" }));
 const unpinSlackMessage = vi.fn(async (..._args: unknown[]) => ({}));
 
@@ -103,7 +102,6 @@ describe("handleSlackAction", () => {
       pinSlackMessage,
       reactSlackMessage,
       readSlackMessages,
-      recordSlackThreadParticipation,
       removeOwnSlackReactions,
       removeSlackReaction,
       sendSlackMessage,
diff --git a/extensions/slack/src/action-runtime.ts b/extensions/slack/src/action-runtime.ts
index 28e798fc5d0..86dce489abf 100644
--- a/extensions/slack/src/action-runtime.ts
+++ b/extensions/slack/src/action-runtime.ts
@@ -12,7 +12,6 @@ import {
   type OpenClawConfig,
   withNormalizedTimestamp,
 } from "./runtime-api.js";
-import { recordSlackThreadParticipation } from "./sent-thread-cache.js";
 import { parseSlackTarget, resolveSlackChannelId } from "./targets.js";
 
 const messagingActions = new Set([
@@ -78,7 +77,6 @@ export const slackActionRuntime = {
   pinSlackMessage: createLazySlackAction("pinSlackMessage"),
   reactSlackMessage: createLazySlackAction("reactSlackMessage"),
   readSlackMessages: createLazySlackAction("readSlackMessages"),
-  recordSlackThreadParticipation,
   removeOwnSlackReactions: createLazySlackAction("removeOwnSlackReactions"),
   removeSlackReaction: createLazySlackAction("removeSlackReaction"),
   sendSlackMessage: createLazySlackAction("sendSlackMessage"),
@@ -273,14 +271,6 @@ export async function handleSlackAction(
                 blocks,
               });
 
-        if (threadTs && result.channelId && account.accountId) {
-          slackActionRuntime.recordSlackThreadParticipation(
-            account.accountId,
-            result.channelId,
-            threadTs,
-          );
-        }
-
         // Keep "first" mode consistent even when the agent explicitly provided
         // threadTs: once we send a message to the current channel, consider the
         // first reply "used" so later tool calls don't auto-thread again.
@@ -318,14 +308,6 @@ export async function handleSlackAction(
           ...(title ? { uploadTitle: title } : {}),
         });
 
-        if (threadTs && result.channelId && account.accountId) {
-          slackActionRuntime.recordSlackThreadParticipation(
-            account.accountId,
-            result.channelId,
-            threadTs,
-          );
-        }
-
         if (context?.hasRepliedRef && context.currentChannelId) {
           if (sameSlackChannelTarget(to, context.currentChannelId)) {
             context.hasRepliedRef.value = true;
diff --git a/extensions/slack/src/outbound-delivery.test.ts b/extensions/slack/src/outbound-delivery.test.ts
index c894d7b7e3a..601f239c75d 100644
--- a/extensions/slack/src/outbound-delivery.test.ts
+++ b/extensions/slack/src/outbound-delivery.test.ts
@@ -92,6 +92,25 @@ describe("slack outbound shared hook wiring", () => {
     expect(sendMessageSlackMock).toHaveBeenCalledTimes(1);
   });
 
+  it("passes replyToId as Slack threadTs for threaded outbound delivery", async () => {
+    await deliverOutboundPayloads({
+      cfg,
+      channel: "slack",
+      to: "C123",
+      payloads: [{ text: "hello" }],
+      accountId: "default",
+      replyToId: "1712000000.000001",
+    });
+
+    expect(sendMessageSlackMock).toHaveBeenCalledWith(
+      "C123",
+      "hello",
+      expect.objectContaining({
+        threadTs: "1712000000.000001",
+      }),
+    );
+  });
+
   it("respects cancel from the shared hook without a second adapter pass", async () => {
     const hookRegistry = createEmptyPluginRegistry();
     const handler = vi.fn().mockResolvedValue({ cancel: true });
diff --git a/extensions/slack/src/send.blocks.test.ts b/extensions/slack/src/send.blocks.test.ts
index 5f085a60029..6ecb1520014 100644
--- a/extensions/slack/src/send.blocks.test.ts
+++ b/extensions/slack/src/send.blocks.test.ts
@@ -1,5 +1,9 @@
 import { describe, expect, it } from "vitest";
 import { createSlackSendTestClient, installSlackBlockTestMocks } from "./blocks.test-helpers.js";
+import {
+  clearSlackThreadParticipationCache,
+  hasSlackThreadParticipation,
+} from "./sent-thread-cache.js";
 
 installSlackBlockTestMocks();
 const { sendMessageSlack } = await import("./send.js");
@@ -67,6 +71,49 @@ describe("sendMessageSlack NO_REPLY guard", () => {
   });
 });
 
+describe("sendMessageSlack thread participation", () => {
+  it("records participation after a successful threaded send", async () => {
+    clearSlackThreadParticipationCache();
+    const client = createSlackSendTestClient();
+
+    await sendMessageSlack("channel:C123", "hello thread", {
+      token: "xoxb-test",
+      cfg: SLACK_TEST_CFG,
+      client,
+      threadTs: "1712345678.123456",
+    });
+
+    expect(hasSlackThreadParticipation("default", "C123", "1712345678.123456")).toBe(true);
+  });
+
+  it("does not record participation for unthreaded sends", async () => {
+    clearSlackThreadParticipationCache();
+    const client = createSlackSendTestClient();
+
+    await sendMessageSlack("channel:C123", "hello channel", {
+      token: "xoxb-test",
+      cfg: SLACK_TEST_CFG,
+      client,
+    });
+
+    expect(hasSlackThreadParticipation("default", "C123", "1712345678.123456")).toBe(false);
+  });
+
+  it("does not record participation for invalid thread ids", async () => {
+    clearSlackThreadParticipationCache();
+    const client = createSlackSendTestClient();
+
+    await sendMessageSlack("channel:C123", "hello invalid thread", {
+      token: "xoxb-test",
+      cfg: SLACK_TEST_CFG,
+      client,
+      threadTs: "not-a-slack-thread",
+    });
+
+    expect(hasSlackThreadParticipation("default", "C123", "not-a-slack-thread")).toBe(false);
+  });
+});
+
 describe("sendMessageSlack chunking", () => {
   it("keeps 4205-character text in a single Slack post by default", async () => {
     const client = createSlackSendTestClient();
diff --git a/extensions/slack/src/send.ts b/extensions/slack/src/send.ts
index 3839cc91209..ceb145e225b 100644
--- a/extensions/slack/src/send.ts
+++ b/extensions/slack/src/send.ts
@@ -24,7 +24,9 @@ import { createSlackTokenCacheKey, getSlackWriteClient } from "./client.js";
 import { markdownToSlackMrkdwnChunks } from "./format.js";
 import { SLACK_TEXT_LIMIT } from "./limits.js";
 import { loadOutboundMediaFromUrl } from "./runtime-api.js";
+import { recordSlackThreadParticipation } from "./sent-thread-cache.js";
 import { parseSlackTarget } from "./targets.js";
+import { normalizeSlackThreadTsCandidate } from "./thread-ts.js";
 import { resolveSlackBotToken } from "./token.js";
 import { truncateSlackText } from "./truncate.js";
 const SLACK_UPLOAD_SSRF_POLICY = {
@@ -535,7 +537,7 @@ export async function sendMessageSlack(
     recipient,
     threadTs: opts.threadTs,
   });
-  return await runQueuedSlackSend(queueKey, () =>
+  const result = await runQueuedSlackSend(queueKey, () =>
     sendMessageSlackQueued({
       trimmedMessage,
       opts,
@@ -546,6 +548,11 @@ export async function sendMessageSlack(
       blocks,
     }),
   );
+  const threadTs = normalizeSlackThreadTsCandidate(opts.threadTs);
+  if (threadTs && result.channelId && account.accountId) {
+    recordSlackThreadParticipation(account.accountId, result.channelId, threadTs);
+  }
+  return result;
 }
 
 async function sendMessageSlackQueued(params: {
diff --git a/extensions/slack/src/send.upload.test.ts b/extensions/slack/src/send.upload.test.ts
index db2502e1056..ddbcb2d05fc 100644
--- a/extensions/slack/src/send.upload.test.ts
+++ b/extensions/slack/src/send.upload.test.ts
@@ -1,6 +1,10 @@
 import type { WebClient } from "@slack/web-api";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { installSlackBlockTestMocks } from "./blocks.test-helpers.js";
+import {
+  clearSlackThreadParticipationCache,
+  hasSlackThreadParticipation,
+} from "./sent-thread-cache.js";
 
 // --- Module mocks (must precede dynamic import) ---
 installSlackBlockTestMocks();
@@ -96,6 +100,7 @@ describe("sendMessageSlack file upload with user IDs", () => {
     loadOutboundMediaFromUrlMock.mockClear();
     clearSlackDmChannelCache();
     clearSlackSendQueuesForTest();
+    clearSlackThreadParticipationCache();
   });
 
   afterEach(() => {
@@ -297,6 +302,7 @@ describe("sendMessageSlack file upload with user IDs", () => {
         thread_ts: "171.222",
       }),
     );
+    expect(hasSlackThreadParticipation("default", "C123CHAN", "171.222")).toBe(true);
   });
 
   it("uses explicit upload filename and title overrides when provided", async () => {