diff --git a/src/cron/isolated-agent/channel-output-policy.test.ts b/src/cron/isolated-agent/channel-output-policy.test.ts
index f715a5838b01..9277da818d3d 100644
--- a/src/cron/isolated-agent/channel-output-policy.test.ts
+++ b/src/cron/isolated-agent/channel-output-policy.test.ts
@@ -56,6 +56,16 @@ describe("cron channel output policy", () => {
     ).resolves.toEqual({
       preferFinalAssistantVisibleText: false,
     });
+    // deliveryRequested is optional — undefined and missing opts are
+    // equivalent to "not requested" (no channel to deliver to). #90664
+    await expect(
+      resolveCronChannelOutputPolicy(undefined, { deliveryRequested: undefined }),
+    ).resolves.toEqual({
+      preferFinalAssistantVisibleText: true,
+    });
+    await expect(resolveCronChannelOutputPolicy(undefined)).resolves.toEqual({
+      preferFinalAssistantVisibleText: true,
+    });
   });
 
   it("lets channel plugins format current tool context targets", async () => {
diff --git a/src/cron/isolated-agent/channel-output-policy.ts b/src/cron/isolated-agent/channel-output-policy.ts
index cfcba842a2e3..bf68dac2d7ca 100644
--- a/src/cron/isolated-agent/channel-output-policy.ts
+++ b/src/cron/isolated-agent/channel-output-policy.ts
@@ -21,7 +21,7 @@ export async function resolveCronChannelOutputPolicy(
 }> {
   const channelId = normalizeOptionalLowercaseString(channel);
   if (!channelId) {
-    return { preferFinalAssistantVisibleText: opts?.deliveryRequested === false };
+    return { preferFinalAssistantVisibleText: opts?.deliveryRequested !== true };
   }
   const { getChannelPlugin } = await loadChannelPluginRuntime();
   return {