diff --git a/src/cron/service.main-job-passes-heartbeat-target-last.test.ts b/src/cron/service.main-job-passes-heartbeat-target-last.test.ts
new file mode 100644
index 00000000000..03a8eb214dd
--- /dev/null
+++ b/src/cron/service.main-job-passes-heartbeat-target-last.test.ts
@@ -0,0 +1,122 @@
+import { describe, expect, it, vi } from "vitest";
+import type { HeartbeatRunResult } from "../infra/heartbeat-wake.js";
+import { CronService } from "./service.js";
+import { setupCronServiceSuite, writeCronStoreSnapshot } from "./service.test-harness.js";
+import type { CronJob } from "./types.js";
+
+const { logger, makeStorePath } = setupCronServiceSuite({
+  prefix: "cron-main-heartbeat-target",
+});
+
+describe("cron main job passes heartbeat target=last", () => {
+  it("should pass heartbeat.target=last to runHeartbeatOnce for wakeMode=now main jobs", async () => {
+    const { storePath } = await makeStorePath();
+    const now = Date.now();
+
+    const job: CronJob = {
+      id: "test-main-delivery",
+      name: "test-main-delivery",
+      enabled: true,
+      createdAtMs: now - 10_000,
+      updatedAtMs: now - 10_000,
+      schedule: { kind: "every", everyMs: 60_000 },
+      sessionTarget: "main",
+      wakeMode: "now",
+      payload: { kind: "systemEvent", text: "Check in" },
+      state: { nextRunAtMs: now - 1 },
+    };
+
+    await writeCronStoreSnapshot({ storePath, jobs: [job] });
+
+    const enqueueSystemEvent = vi.fn();
+    const requestHeartbeatNow = vi.fn();
+    const runHeartbeatOnce = vi.fn<
+      (opts?: {
+        reason?: string;
+        agentId?: string;
+        sessionKey?: string;
+        heartbeat?: { target?: string };
+      }) => Promise<HeartbeatRunResult>
+    >(async () => ({
+      status: "ran" as const,
+      durationMs: 50,
+    }));
+
+    const cron = new CronService({
+      storePath,
+      cronEnabled: true,
+      log: logger,
+      enqueueSystemEvent,
+      requestHeartbeatNow,
+      runHeartbeatOnce,
+      runIsolatedAgentJob: vi.fn(async () => ({ status: "ok" as const })),
+    });
+
+    await cron.start();
+
+    // Wait for the timer to fire
+    await vi.advanceTimersByTimeAsync(2_000);
+
+    // Give the async run a chance to complete
+    await vi.advanceTimersByTimeAsync(1_000);
+
+    cron.stop();
+
+    // runHeartbeatOnce should have been called
+    expect(runHeartbeatOnce).toHaveBeenCalled();
+
+    // The heartbeat config passed should include target: "last" so the
+    // heartbeat runner delivers the response to the last active channel.
+    const callArgs = runHeartbeatOnce.mock.calls[0]?.[0];
+    expect(callArgs).toBeDefined();
+    expect(callArgs?.heartbeat).toBeDefined();
+    expect(callArgs?.heartbeat?.target).toBe("last");
+  });
+
+  it("should not pass heartbeat target for wakeMode=next-heartbeat main jobs", async () => {
+    const { storePath } = await makeStorePath();
+    const now = Date.now();
+
+    const job: CronJob = {
+      id: "test-next-heartbeat",
+      name: "test-next-heartbeat",
+      enabled: true,
+      createdAtMs: now - 10_000,
+      updatedAtMs: now - 10_000,
+      schedule: { kind: "every", everyMs: 60_000 },
+      sessionTarget: "main",
+      wakeMode: "next-heartbeat",
+      payload: { kind: "systemEvent", text: "Check in" },
+      state: { nextRunAtMs: now - 1 },
+    };
+
+    await writeCronStoreSnapshot({ storePath, jobs: [job] });
+
+    const enqueueSystemEvent = vi.fn();
+    const requestHeartbeatNow = vi.fn();
+    const runHeartbeatOnce = vi.fn(async () => ({
+      status: "ran" as const,
+      durationMs: 50,
+    }));
+
+    const cron = new CronService({
+      storePath,
+      cronEnabled: true,
+      log: logger,
+      enqueueSystemEvent,
+      requestHeartbeatNow,
+      runHeartbeatOnce,
+      runIsolatedAgentJob: vi.fn(async () => ({ status: "ok" as const })),
+    });
+
+    await cron.start();
+    await vi.advanceTimersByTimeAsync(2_000);
+    await vi.advanceTimersByTimeAsync(1_000);
+    cron.stop();
+
+    // wakeMode=next-heartbeat uses requestHeartbeatNow, not runHeartbeatOnce
+    expect(requestHeartbeatNow).toHaveBeenCalled();
+    // runHeartbeatOnce should NOT have been called for next-heartbeat mode
+    expect(runHeartbeatOnce).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/cron/service/state.ts b/src/cron/service/state.ts
index 3ad9cc1f591..604fd842b68 100644
--- a/src/cron/service/state.ts
+++ b/src/cron/service/state.ts
@@ -56,6 +56,8 @@ export type CronServiceDeps = {
     reason?: string;
     agentId?: string;
     sessionKey?: string;
+    /** Optional heartbeat config override (e.g. target: "last" for cron-triggered heartbeats). */
+    heartbeat?: { target?: string };
   }) => Promise<HeartbeatRunResult>;
   /**
    * WakeMode=now: max time to wait for runHeartbeatOnce to stop returning
diff --git a/src/cron/service/timer.ts b/src/cron/service/timer.ts
index 42be9848294..7a0a8d181c1 100644
--- a/src/cron/service/timer.ts
+++ b/src/cron/service/timer.ts
@@ -663,6 +663,11 @@ export async function executeJobCore(
           reason,
           agentId: job.agentId,
           sessionKey: targetMainSessionKey,
+          // Cron-triggered heartbeats should deliver to the last active channel.
+          // Without this override, heartbeat target defaults to "none" (since
+          // e2362d35) and cron main-session responses are silently swallowed.
+          // See: https://github.com/openclaw/openclaw/issues/28508
+          heartbeat: { target: "last" },
         });
         if (
           heartbeatResult.status !== "skipped" ||
diff --git a/src/gateway/server-cron.test.ts b/src/gateway/server-cron.test.ts
index 82a6d05f8e9..cd322bc6ebd 100644
--- a/src/gateway/server-cron.test.ts
+++ b/src/gateway/server-cron.test.ts
@@ -40,7 +40,7 @@ describe("buildGatewayCronService", () => {
     fetchWithSsrFGuardMock.mockClear();
   });
 
-  it("canonicalizes non-agent sessionKey to agent store key for enqueue + wake", async () => {
+  it("routes main-target jobs to the main session for enqueue + wake", async () => {
     const tmpDir = path.join(os.tmpdir(), `server-cron-${Date.now()}`);
     const cfg = {
       session: {
@@ -73,12 +73,12 @@ describe("buildGatewayCronService", () => {
       expect(enqueueSystemEventMock).toHaveBeenCalledWith(
         "hello",
         expect.objectContaining({
-          sessionKey: "agent:main:discord:channel:ops",
+          sessionKey: "agent:main:main",
         }),
       );
       expect(requestHeartbeatNowMock).toHaveBeenCalledWith(
         expect.objectContaining({
-          sessionKey: "agent:main:discord:channel:ops",
+          sessionKey: undefined,
         }),
       );
     } finally {
diff --git a/src/gateway/server-cron.ts b/src/gateway/server-cron.ts
index c97d90b99f3..7430870f111 100644
--- a/src/gateway/server-cron.ts
+++ b/src/gateway/server-cron.ts
@@ -182,11 +182,29 @@ export function buildGatewayCronService(params: {
     },
     runHeartbeatOnce: async (opts) => {
       const { runtimeConfig, agentId, sessionKey } = resolveCronWakeTarget(opts);
+      // Merge cron-supplied heartbeat overrides (e.g. target: "last") with the
+      // fully resolved agent heartbeat config so cron-triggered heartbeats
+      // respect agent-specific overrides (agents.list[].heartbeat) before
+      // falling back to agents.defaults.heartbeat.
+      const agentEntry =
+        Array.isArray(runtimeConfig.agents?.list) &&
+        runtimeConfig.agents.list.find(
+          (entry) =>
+            entry && typeof entry.id === "string" && normalizeAgentId(entry.id) === agentId,
+        );
+      const baseHeartbeat = {
+        ...runtimeConfig.agents?.defaults?.heartbeat,
+        ...agentEntry?.heartbeat,
+      };
+      const heartbeatOverride = opts?.heartbeat
+        ? { ...baseHeartbeat, ...opts.heartbeat }
+        : undefined;
       return await runHeartbeatOnce({
         cfg: runtimeConfig,
         reason: opts?.reason,
         agentId,
         sessionKey,
+        heartbeat: heartbeatOverride,
         deps: { ...params.deps, runtime: defaultRuntime },
       });
     },