diff --git a/src/agents/openclaw-tools.subagents.sessions-spawn.cron-note.test.ts b/src/agents/openclaw-tools.subagents.sessions-spawn.cron-note.test.ts
new file mode 100644
index 00000000000..789ff410db6
--- /dev/null
+++ b/src/agents/openclaw-tools.subagents.sessions-spawn.cron-note.test.ts
@@ -0,0 +1,63 @@
+import { beforeEach, describe, expect, it } from "vitest";
+import "./test-helpers/fast-core-tools.js";
+import {
+  getCallGatewayMock,
+  getSessionsSpawnTool,
+  resetSessionsSpawnConfigOverride,
+  setupSessionsSpawnGatewayMock,
+} from "./openclaw-tools.subagents.sessions-spawn.test-harness.js";
+import { resetSubagentRegistryForTests } from "./subagent-registry.js";
+import { SUBAGENT_SPAWN_ACCEPTED_NOTE } from "./subagent-spawn.js";
+
+const callGatewayMock = getCallGatewayMock();
+
+type SpawnResult = { status?: string; note?: string };
+
+describe("sessions_spawn: cron isolated session note suppression", () => {
+  beforeEach(() => {
+    callGatewayMock.mockReset();
+    resetSubagentRegistryForTests();
+    resetSessionsSpawnConfigOverride();
+  });
+
+  it("suppresses ACCEPTED_NOTE for cron isolated sessions (mode=run)", async () => {
+    setupSessionsSpawnGatewayMock({});
+    const tool = await getSessionsSpawnTool({
+      agentSessionKey: "agent:main:cron:dd871818:run:cf959c9f",
+    });
+    const result = await tool.execute("call-cron-run", { task: "test task", mode: "run" });
+    const details = result.details as SpawnResult;
+    expect(details.note).toBeUndefined();
+    expect(details.status).toBe("accepted");
+  });
+
+  it("preserves ACCEPTED_NOTE for regular sessions (mode=run)", async () => {
+    setupSessionsSpawnGatewayMock({});
+    const tool = await getSessionsSpawnTool({
+      agentSessionKey: "agent:main:telegram:63448508",
+    });
+    const result = await tool.execute("call-regular-run", { task: "test task", mode: "run" });
+    const details = result.details as SpawnResult;
+    expect(details.note).toBe(SUBAGENT_SPAWN_ACCEPTED_NOTE);
+    expect(details.status).toBe("accepted");
+  });
+
+  it("suppresses ACCEPTED_NOTE for any agent with :cron: in session key", async () => {
+    setupSessionsSpawnGatewayMock({});
+    // Ensure the check uses includes(":cron:") not startsWith("cron:")
+    const tool = await getSessionsSpawnTool({
+      agentSessionKey: "agent:marian-job-search:cron:a7c7874a:run:abc123",
+    });
+    const result = await tool.execute("call-other-agent-cron", { task: "test task", mode: "run" });
+    expect((result.details as SpawnResult).note).toBeUndefined();
+  });
+
+  it("does not suppress note when agentSessionKey is undefined", async () => {
+    setupSessionsSpawnGatewayMock({});
+    const tool = await getSessionsSpawnTool({
+      agentSessionKey: undefined,
+    });
+    const result = await tool.execute("call-no-key", { task: "test task", mode: "run" });
+    expect((result.details as SpawnResult).note).toBe(SUBAGENT_SPAWN_ACCEPTED_NOTE);
+  });
+});
diff --git a/src/agents/subagent-spawn.ts b/src/agents/subagent-spawn.ts
index 37b612145ed..c3773c46ff3 100644
--- a/src/agents/subagent-spawn.ts
+++ b/src/agents/subagent-spawn.ts
@@ -524,13 +524,23 @@ export async function spawnSubagentDirect(
     }
   }
 
+  // Check if we're in a cron isolated session - don't add "do not poll" note
+  // because cron sessions end immediately after the agent produces a response,
+  // so the agent needs to wait for subagent results to keep the turn alive.
+  const isCronSession = ctx.agentSessionKey?.includes(":cron:");
+  const note =
+    spawnMode === "session"
+      ? SUBAGENT_SPAWN_SESSION_ACCEPTED_NOTE
+      : isCronSession
+        ? undefined
+        : SUBAGENT_SPAWN_ACCEPTED_NOTE;
+
   return {
     status: "accepted",
     childSessionKey,
     runId: childRunId,
     mode: spawnMode,
-    note:
-      spawnMode === "session" ? SUBAGENT_SPAWN_SESSION_ACCEPTED_NOTE : SUBAGENT_SPAWN_ACCEPTED_NOTE,
+    note,
     modelApplied: resolvedModel ? modelApplied : undefined,
   };
 }