diff --git a/src/cron/isolated-agent.delivers-response-has-heartbeat-ok-but-includes.test.ts b/src/cron/isolated-agent.delivers-response-has-heartbeat-ok-but-includes.test.ts
index 023c1e9eedc..8ea21bffefe 100644
--- a/src/cron/isolated-agent.delivers-response-has-heartbeat-ok-but-includes.test.ts
+++ b/src/cron/isolated-agent.delivers-response-has-heartbeat-ok-but-includes.test.ts
@@ -138,11 +138,10 @@ describe("runCronIsolatedAgentTurn", () => {
     });
   });
 
-  it("handles media heartbeat delivery and last-target text delivery", async () => {
+  it("delivers media payloads even when heartbeat text is suppressed", async () => {
     await withTempHome(async (home) => {
       const { storePath, deps } = await createTelegramDeliveryFixture(home);
 
-      // Media should still be delivered even if text is just HEARTBEAT_OK.
       mockEmbeddedAgentPayloads([
         { text: "HEARTBEAT_OK", mediaUrl: "https://example.com/img.png" },
       ]);
@@ -156,9 +155,13 @@ describe("runCronIsolatedAgentTurn", () => {
       expect(mediaRes.status).toBe("ok");
       expect(deps.sendMessageTelegram).toHaveBeenCalled();
       expect(runSubagentAnnounceFlow).not.toHaveBeenCalled();
+    });
+  });
+
+  it("keeps non-empty heartbeat text when last-target ack suppression is disabled", async () => {
+    await withTempHome(async (home) => {
+      const { storePath, deps } = await createTelegramDeliveryFixture(home);
 
-      vi.mocked(runSubagentAnnounceFlow).mockClear();
-      vi.mocked(deps.sendMessageTelegram).mockClear();
       mockEmbeddedAgentPayloads([{ text: "HEARTBEAT_OK 🦞" }]);
 
       const cfg = makeCfg(home, storePath);
@@ -194,10 +197,23 @@ describe("runCronIsolatedAgentTurn", () => {
         "HEARTBEAT_OK 🦞",
         expect.objectContaining({ accountId: undefined }),
       );
+    });
+  });
 
-      vi.mocked(deps.sendMessageTelegram).mockClear();
-      vi.mocked(runSubagentAnnounceFlow).mockClear();
-      vi.mocked(callGateway).mockClear();
+  it("deletes the direct cron session after last-target text delivery", async () => {
+    await withTempHome(async (home) => {
+      const { storePath, deps } = await createTelegramDeliveryFixture(home);
+
+      mockEmbeddedAgentPayloads([{ text: "HEARTBEAT_OK 🦞" }]);
+
+      const cfg = makeCfg(home, storePath);
+      cfg.agents = {
+        ...cfg.agents,
+        defaults: {
+          ...cfg.agents?.defaults,
+          heartbeat: { ackMaxChars: 0 },
+        },
+      };
 
       const deleteRes = await runCronIsolatedAgentTurn({
         cfg,