diff --git a/nanobot/cli/commands.py b/nanobot/cli/commands.py
index 25fa8e1..2662e9f 100644
--- a/nanobot/cli/commands.py
+++ b/nanobot/cli/commands.py
@@ -296,18 +296,30 @@ def gateway(
     # Set cron callback (needs agent)
     async def on_cron_job(job: CronJob) -> str | None:
         """Execute a cron job through the agent."""
+        from nanobot.agent.tools.message import MessageTool
+        reminder_note = (
+            "[Scheduled Task] Timer finished.\n\n"
+            f"Task '{job.name}' has been triggered.\n"
+            f"Scheduled instruction: {job.payload.message}"
+        )
+
         response = await agent.process_direct(
-            job.payload.message,
+            reminder_note,
             session_key=f"cron:{job.id}",
             channel=job.payload.channel or "cli",
             chat_id=job.payload.to or "direct",
         )
-        if job.payload.deliver and job.payload.to:
+
+        message_tool = agent.tools.get("message")
+        if isinstance(message_tool, MessageTool) and message_tool._sent_in_turn:
+            return response
+
+        if job.payload.deliver and job.payload.to and response:
             from nanobot.bus.events import OutboundMessage
             await bus.publish_outbound(OutboundMessage(
                 channel=job.payload.channel or "cli",
                 chat_id=job.payload.to,
-                content=response or ""
+                content=response
             ))
         return response
     cron.on_job = on_cron_job