diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d4d35f7273..a69cf155626 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ Docs: https://docs.openclaw.ai
 - Cron/main-session delivery: preserve `heartbeat.target="last"` through deferred wake queuing, gateway wake forwarding, and same-target wake coalescing so queued cron replies still return to the last active chat. (#69021) Thanks @obviyus.
 - Cron/gateway: ignore disabled channels when announce delivery ambiguity is checked, and validate main-session delivery patches against the live cron service default agent so hot-reloaded agent config does not falsely reject valid updates. (#69040) Thanks @obviyus.
 - Matrix/allowlists: hot-reload `dm.allowFrom` and `groupAllowFrom` entries on inbound messages while keeping config removals authoritative, so Matrix allowlist changes no longer require a channel restart to add or revoke a sender. (#68546) Thanks @johnlanni.
+- BlueBubbles: always set `method` explicitly on outbound text sends (`"private-api"` when available, `"apple-script"` otherwise), and prefer Private API on macOS 26 even for plain text. Fixes silent delivery failure on macOS setups without Private API where an omitted `method` let BB Server fall back to version-dependent default behavior that silently drops the message (#64480), and the AppleScript `-1700` error on macOS 26 Tahoe plain text sends (#53159). (#69070) Thanks @xqing3.
 
 ## 2026.4.19-beta.2
 
diff --git a/extensions/bluebubbles/src/send.test.ts b/extensions/bluebubbles/src/send.test.ts
index 3253e841ef0..527774412b1 100644
--- a/extensions/bluebubbles/src/send.test.ts
+++ b/extensions/bluebubbles/src/send.test.ts
@@ -1,6 +1,10 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import "./test-mocks.js";
-import { fetchBlueBubblesServerInfo, getCachedBlueBubblesPrivateApiStatus } from "./probe.js";
+import {
+  fetchBlueBubblesServerInfo,
+  getCachedBlueBubblesPrivateApiStatus,
+  isMacOS26OrHigher,
+} from "./probe.js";
 import type { PluginRuntime } from "./runtime-api.js";
 import { clearBlueBubblesRuntime, setBlueBubblesRuntime } from "./runtime.js";
 import { sendMessageBlueBubbles, resolveChatGuidForTarget, createChatForHandle } from "./send.js";
@@ -15,6 +19,7 @@ import { _setFetchGuardForTesting, type BlueBubblesSendTarget } from "./types.js
 const mockFetch = vi.fn();
 const privateApiStatusMock = vi.mocked(getCachedBlueBubblesPrivateApiStatus);
 const fetchServerInfoMock = vi.mocked(fetchBlueBubblesServerInfo);
+const isMacOS26OrHigherMock = vi.mocked(isMacOS26OrHigher);
 const setFetchGuardPassthrough = createBlueBubblesFetchGuardPassthroughInstaller();
 
 installBlueBubblesFetchTestHooks({
@@ -456,7 +461,7 @@ describe("send", () => {
       const body = JSON.parse(sendCall[1].body);
       expect(body.chatGuid).toBe("iMessage;-;+15551234567");
       expect(body.message).toBe("Hello world!");
-      expect(body.method).toBeUndefined();
+      expect(body.method).toBe("apple-script");
     });
 
     it("auto-enables private-network fetches for loopback serverUrl when allowPrivateNetwork is not set", async () => {
@@ -616,7 +621,7 @@ describe("send", () => {
       expect(result.messageId).toBe("msg-uuid-plain");
       const sendCall = mockFetch.mock.calls[1];
       const body = JSON.parse(sendCall[1].body);
-      expect(body.method).toBeUndefined();
+      expect(body.method).toBe("apple-script");
       expect(body.selectedMessageGuid).toBeUndefined();
       expect(body.partIndex).toBeUndefined();
     });
@@ -644,6 +649,62 @@ describe("send", () => {
       expect(body.effectId).toBe("com.apple.MobileSMS.expressivesend.invisibleink");
     });
 
+    // macOS 26 Tahoe broke AppleScript Messages.app automation (-1700). When
+    // Private API is available on these hosts, plain text sends should prefer
+    // Private API even without reply/effect features. (#53159 Bug B, #64480)
+    it("forces Private API for plain text on macOS 26 when available", async () => {
+      mockBlueBubblesPrivateApiStatusOnce(
+        privateApiStatusMock,
+        BLUE_BUBBLES_PRIVATE_API_STATUS.enabled,
+      );
+      isMacOS26OrHigherMock.mockReturnValue(true);
+      mockResolvedHandleTarget();
+      mockSendResponse({ data: { guid: "msg-macos26" } });
+
+      try {
+        const result = await sendMessageBlueBubbles("+15551234567", "Plain text", {
+          serverUrl: "http://localhost:1234",
+          password: "test",
+        });
+
+        expect(result.messageId).toBe("msg-macos26");
+        const sendCall = mockFetch.mock.calls[1];
+        const body = JSON.parse(sendCall[1].body);
+        expect(body.method).toBe("private-api");
+      } finally {
+        isMacOS26OrHigherMock.mockReturnValue(false);
+      }
+    });
+
+    // If macOS 26 host has Private API disabled, there is nothing we can do —
+    // the AppleScript path is broken on that OS. We still tag the send
+    // explicitly as apple-script rather than omitting `method`; BB Server's
+    // behavior on an omitted field is version-dependent and silently drops
+    // on some setups, which is the worse failure mode. (#64480)
+    it("falls back to apple-script on macOS 26 when Private API is disabled", async () => {
+      mockBlueBubblesPrivateApiStatusOnce(
+        privateApiStatusMock,
+        BLUE_BUBBLES_PRIVATE_API_STATUS.disabled,
+      );
+      isMacOS26OrHigherMock.mockReturnValue(true);
+      mockResolvedHandleTarget();
+      mockSendResponse({ data: { guid: "msg-macos26-no-pa" } });
+
+      try {
+        const result = await sendMessageBlueBubbles("+15551234567", "Plain text", {
+          serverUrl: "http://localhost:1234",
+          password: "test",
+        });
+
+        expect(result.messageId).toBe("msg-macos26-no-pa");
+        const sendCall = mockFetch.mock.calls[1];
+        const body = JSON.parse(sendCall[1].body);
+        expect(body.method).toBe("apple-script");
+      } finally {
+        isMacOS26OrHigherMock.mockReturnValue(false);
+      }
+    });
+
     it("warns and downgrades private-api features when status is unknown", async () => {
       const runtimeLog = vi.fn();
       setBlueBubblesRuntime({ log: runtimeLog } as unknown as PluginRuntime);
@@ -666,7 +727,7 @@ describe("send", () => {
 
         const sendCall = mockFetch.mock.calls[1];
         const body = JSON.parse(sendCall[1].body);
-        expect(body.method).toBeUndefined();
+        expect(body.method).toBe("apple-script");
         expect(body.selectedMessageGuid).toBeUndefined();
         expect(body.partIndex).toBeUndefined();
         expect(body.effectId).toBeUndefined();
@@ -925,7 +986,7 @@ describe("send", () => {
           expect(runtimeLog.mock.calls[0]?.[0]).toContain("Private API status unknown");
           const sendCall = mockFetch.mock.calls[1];
           const body = JSON.parse(sendCall[1].body);
-          expect(body.method).toBeUndefined();
+          expect(body.method).toBe("apple-script");
           expect(body.selectedMessageGuid).toBeUndefined();
         } finally {
           clearBlueBubblesRuntime();
@@ -973,28 +1034,67 @@ describe("send", () => {
           expect(runtimeLog).not.toHaveBeenCalled();
           const sendCall = mockFetch.mock.calls[1];
           const body = JSON.parse(sendCall[1].body);
-          expect(body.method).toBeUndefined();
+          expect(body.method).toBe("apple-script");
           expect(body.selectedMessageGuid).toBeUndefined();
         } finally {
           clearBlueBubblesRuntime();
         }
       });
 
-      it("does not refresh when no reply or effect is requested", async () => {
-        // Cache expired but no Private API features needed — skip refresh
+      // Plain-text sends also need the cache populated so `isMacOS26OrHigher`
+      // can read `os_version` from the same `serverInfoCache`. Without a
+      // refresh on cold/expired cache, macOS 26 detection would silently
+      // miss and force-route would fall back to broken AppleScript.
+      // (Greptile/Codex PR #69070)
+      it("refreshes cache for plain-text sends when status is unknown", async () => {
+        // First call returns null (cache cold/expired). The refresh path
+        // fetches server info; plain-text send still uses AppleScript when
+        // Private API is disabled on the server — but the refresh ran.
+        privateApiStatusMock.mockReturnValueOnce(null).mockReturnValueOnce(false);
+        fetchServerInfoMock.mockResolvedValueOnce({ private_api: false });
         mockResolvedHandleTarget();
-        mockSendResponse({ data: { guid: "msg-plain" } });
+        mockSendResponse({ data: { guid: "msg-plain-refreshed" } });
 
         const result = await sendMessageBlueBubbles("+15551234567", "Plain message", {
           serverUrl: "http://localhost:1234",
           password: "test",
         });
 
-        expect(result.messageId).toBe("msg-plain");
-        expect(fetchServerInfoMock).not.toHaveBeenCalled();
+        expect(result.messageId).toBe("msg-plain-refreshed");
+        expect(fetchServerInfoMock).toHaveBeenCalledTimes(1);
         const sendCall = mockFetch.mock.calls[1];
         const body = JSON.parse(sendCall[1].body);
-        expect(body.method).toBeUndefined();
+        expect(body.method).toBe("apple-script");
+      });
+
+      // Cold cache + macOS 26 + Private API enabled on refresh — the
+      // refresh populates the cache, `isMacOS26OrHigher` returns true, and
+      // plain-text routes through Private API instead of broken AppleScript.
+      // (Greptile/Codex PR #69070)
+      it("force-routes macOS 26 plain-text through Private API after cold-cache refresh", async () => {
+        privateApiStatusMock.mockReturnValueOnce(null).mockReturnValueOnce(true);
+        fetchServerInfoMock.mockResolvedValueOnce({
+          private_api: true,
+          os_version: "26.0",
+        });
+        isMacOS26OrHigherMock.mockReturnValue(true);
+        mockResolvedHandleTarget();
+        mockSendResponse({ data: { guid: "msg-macos26-refreshed" } });
+
+        try {
+          const result = await sendMessageBlueBubbles("+15551234567", "Plain message", {
+            serverUrl: "http://localhost:1234",
+            password: "test",
+          });
+
+          expect(result.messageId).toBe("msg-macos26-refreshed");
+          expect(fetchServerInfoMock).toHaveBeenCalledTimes(1);
+          const sendCall = mockFetch.mock.calls[1];
+          const body = JSON.parse(sendCall[1].body);
+          expect(body.method).toBe("private-api");
+        } finally {
+          isMacOS26OrHigherMock.mockReturnValue(false);
+        }
       });
 
       it("degrades gracefully when refresh returns null (server unreachable)", async () => {
diff --git a/extensions/bluebubbles/src/send.ts b/extensions/bluebubbles/src/send.ts
index 027714bc563..a2506a73ca5 100644
--- a/extensions/bluebubbles/src/send.ts
+++ b/extensions/bluebubbles/src/send.ts
@@ -11,6 +11,7 @@ import {
   fetchBlueBubblesServerInfo,
   getCachedBlueBubblesPrivateApiStatus,
   isBlueBubblesPrivateApiStatusEnabled,
+  isMacOS26OrHigher,
 } from "./probe.js";
 import type { OpenClawConfig } from "./runtime-api.js";
 import { warnBlueBubbles } from "./runtime.js";
@@ -88,11 +89,18 @@ function resolvePrivateApiDecision(params: {
   privateApiStatus: boolean | null;
   wantsReplyThread: boolean;
   wantsEffect: boolean;
+  accountId?: string;
 }): PrivateApiDecision {
-  const { privateApiStatus, wantsReplyThread, wantsEffect } = params;
+  const { privateApiStatus, wantsReplyThread, wantsEffect, accountId } = params;
   const needsPrivateApi = wantsReplyThread || wantsEffect;
+  // On macOS 26 Tahoe, AppleScript Messages.app automation is broken
+  // (`-1700` error) for outbound sends. Prefer Private API even for plain
+  // text when it is available so sends still reach the recipient.
+  // (#53159 Bug B, #64480)
+  const forceOnMacOS26 =
+    isMacOS26OrHigher(accountId) && isBlueBubblesPrivateApiStatusEnabled(privateApiStatus);
   const canUsePrivateApi =
-    needsPrivateApi && isBlueBubblesPrivateApiStatusEnabled(privateApiStatus);
+    (needsPrivateApi || forceOnMacOS26) && isBlueBubblesPrivateApiStatusEnabled(privateApiStatus);
   const throwEffectDisabledError = wantsEffect && privateApiStatus === false;
   if (!needsPrivateApi || privateApiStatus !== null) {
     return { canUsePrivateApi, throwEffectDisabledError };
@@ -474,10 +482,14 @@ export async function sendMessageBlueBubbles(
   const wantsReplyThread = normalizeOptionalString(opts.replyToMessageGuid) !== undefined;
   const wantsEffect = Boolean(effectId);
 
-  // Lazy refresh: when the cache has expired and Private API features are needed,
-  // fetch server info before making the decision. This prevents silent degradation
-  // of reply threading and effects after the 10-minute cache TTL expires. (#43764)
-  if (privateApiStatus === null && (wantsReplyThread || wantsEffect)) {
+  // Lazy refresh: when the cache has expired, fetch server info before
+  // making the decision. Originally scoped to reply/effect features (#43764)
+  // to avoid silent degradation after the 10-minute cache TTL expires. Now
+  // always fires on null status, because `isMacOS26OrHigher()` reads from
+  // the same cache and plain-text sends on macOS 26 need Private API too —
+  // without this, `forceOnMacOS26` silently falls back to broken AppleScript
+  // after TTL expiry or on a cold cache. (#64480, Greptile/Codex PR #69070)
+  if (privateApiStatus === null) {
     try {
       await fetchBlueBubblesServerInfo({
         baseUrl,
@@ -496,6 +508,7 @@ export async function sendMessageBlueBubbles(
     privateApiStatus,
     wantsReplyThread,
     wantsEffect,
+    accountId,
   });
   if (privateApiDecision.throwEffectDisabledError) {
     throw new Error(
@@ -505,14 +518,16 @@ export async function sendMessageBlueBubbles(
   if (privateApiDecision.warningMessage) {
     warnBlueBubbles(privateApiDecision.warningMessage);
   }
+  // Always set `method` explicitly. BB Server's behavior on an omitted
+  // `method` is version-dependent and silently drops on some setups (e.g.
+  // macOS without Private API — message lands in Messages.app locally but
+  // never reaches the phone). (#64480)
   const payload: Record<string, unknown> = {
     chatGuid,
     tempGuid: crypto.randomUUID(),
     message: strippedText,
+    method: privateApiDecision.canUsePrivateApi ? "private-api" : "apple-script",
   };
-  if (privateApiDecision.canUsePrivateApi) {
-    payload.method = "private-api";
-  }
 
   // Add reply threading support
   if (wantsReplyThread && privateApiDecision.canUsePrivateApi) {
diff --git a/extensions/bluebubbles/src/test-harness.ts b/extensions/bluebubbles/src/test-harness.ts
index 000d080c8b7..1600f7904bb 100644
--- a/extensions/bluebubbles/src/test-harness.ts
+++ b/extensions/bluebubbles/src/test-harness.ts
@@ -85,6 +85,7 @@ type BlueBubblesProbeMockModule = {
   fetchBlueBubblesServerInfo: Mock<() => Promise<Record<string, unknown> | null>>;
   getCachedBlueBubblesPrivateApiStatus: Mock<() => boolean | null>;
   isBlueBubblesPrivateApiStatusEnabled: Mock<(status: boolean | null) => boolean>;
+  isMacOS26OrHigher: Mock<(accountId?: string) => boolean>;
 };
 
 export function createBlueBubblesProbeMockModule(): BlueBubblesProbeMockModule {
@@ -94,6 +95,7 @@ export function createBlueBubblesProbeMockModule(): BlueBubblesProbeMockModule {
       .fn()
       .mockReturnValue(BLUE_BUBBLES_PRIVATE_API_STATUS.unknown),
     isBlueBubblesPrivateApiStatusEnabled: vi.fn((status: boolean | null) => status === true),
+    isMacOS26OrHigher: vi.fn().mockReturnValue(false),
   };
 }
 
diff --git a/scripts/check-no-raw-channel-fetch.mjs b/scripts/check-no-raw-channel-fetch.mjs
index c5d35d3dddf..b5bfea51c62 100644
--- a/scripts/check-no-raw-channel-fetch.mjs
+++ b/scripts/check-no-raw-channel-fetch.mjs
@@ -14,7 +14,7 @@ const sourceRoots = ["src/channels", "src/routing", "src/line", "extensions"];
 // Temporary allowlist for legacy callsites. New raw fetch callsites in channel/plugin runtime
 // code should be rejected and migrated to fetchWithSsrFGuard/shared channel helpers.
 const allowedRawFetchCallsites = new Set([
-  bundledPluginCallsite("bluebubbles", "src/test-harness.ts", 130),
+  bundledPluginCallsite("bluebubbles", "src/test-harness.ts", 132),
   bundledPluginCallsite("bluebubbles", "src/types.ts", 189),
   bundledPluginCallsite("browser", "src/browser/cdp.helpers.ts", 268),
   bundledPluginCallsite("browser", "src/browser/client-fetch.ts", 192),