diff --git a/astrbot/core/astr_main_agent.py b/astrbot/core/astr_main_agent.py
index 16ebac7a8b..6ed2f4b80f 100644
--- a/astrbot/core/astr_main_agent.py
+++ b/astrbot/core/astr_main_agent.py
@@ -271,6 +271,8 @@ async def _apply_kb(
     config: MainAgentBuildConfig,
 ) -> None:
     if not config.kb_agentic_mode:
+        if event.get_platform_name() == "cron":
+            return
         if req.prompt is None or not req.prompt.strip():
             return
         try:
diff --git a/tests/unit/test_astr_main_agent.py b/tests/unit/test_astr_main_agent.py
index 3723ec0d49..3956ed7801 100644
--- a/tests/unit/test_astr_main_agent.py
+++ b/tests/unit/test_astr_main_agent.py
@@ -391,6 +391,24 @@ async def test_apply_kb_without_agentic_mode(self, mock_event, mock_context):
             {"role": "user", "content": [{"type": "text", "text": "test question"}]}
         ]
 
+    @pytest.mark.asyncio
+    async def test_apply_kb_skips_cron_events(self, mock_event, mock_context):
+        """Test scheduled tasks do not inject KB results as user content."""
+        module = ama
+        mock_event.get_platform_name.return_value = "cron"
+        req = ProviderRequest(prompt="scheduled task", system_prompt="System prompt")
+        config = module.MainAgentBuildConfig(
+            tool_call_timeout=60, kb_agentic_mode=False
+        )
+        retrieve = AsyncMock(return_value="KB result")
+
+        with patch("astrbot.core.astr_main_agent.retrieve_knowledge_base", retrieve):
+            await module._apply_kb(mock_event, req, mock_context, config)
+
+        retrieve.assert_not_awaited()
+        assert req.system_prompt == "System prompt"
+        assert req.extra_user_content_parts == []
+
     @pytest.mark.asyncio
     async def test_apply_kb_with_agentic_mode(self, mock_event, mock_context):
         """Test applying knowledge base in agentic mode."""