diff --git a/tests/unit/vertex_adk/test_agent_engine_templates_adk.py b/tests/unit/vertex_adk/test_agent_engine_templates_adk.py
index 980e985433..19fb6c79d4 100644
--- a/tests/unit/vertex_adk/test_agent_engine_templates_adk.py
+++ b/tests/unit/vertex_adk/test_agent_engine_templates_adk.py
@@ -800,6 +800,22 @@ def test_enable_tracing_warning(self, caplog):
         # app.set_up()
         # assert "enable_tracing=True but proceeding with tracing disabled" in caplog.text
 
+    # TODO(b/384730642): Re-enable this test once the parent issue is fixed.
+    # @pytest.mark.parametrize(
+    #     "enable_tracing,want_warning",
+    #     [
+    #         (True, False),
+    #         (False, True),
+    #         (None, False),
+    #     ],
+    # )
+    # @pytest.mark.usefixtures("caplog")
+    # def test_tracing_disabled_warning(self, enable_tracing, want_warning, caplog):
+    #     _ = agent_engines.AdkApp(agent=_TEST_AGENT, enable_tracing=enable_tracing)
+    #     assert (
+    #         "[WARNING] Your 'enable_tracing=False' setting" in caplog.text
+    #     ) == want_warning
+
     @mock.patch.dict(os.environ)
     def test_span_content_capture_disabled_by_default(self):
         app = agent_engines.AdkApp(agent=_TEST_AGENT)
diff --git a/tests/unit/vertex_adk/test_reasoning_engine_templates_adk.py b/tests/unit/vertex_adk/test_reasoning_engine_templates_adk.py
index 917b9430d1..add706859a 100644
--- a/tests/unit/vertex_adk/test_reasoning_engine_templates_adk.py
+++ b/tests/unit/vertex_adk/test_reasoning_engine_templates_adk.py
@@ -781,6 +781,25 @@ def test_enable_tracing_warning(self, caplog):
         # app.set_up()
         # assert "enable_tracing=True but proceeding with tracing disabled" in caplog.text
 
+    # TODO(b/384730642): Re-enable this test once the parent issue is fixed.
+    # @pytest.mark.parametrize(
+    #     "enable_tracing,want_warning",
+    #     [
+    #         (True, False),
+    #         (False, True),
+    #         (None, False),
+    #     ],
+    # )
+    # @pytest.mark.usefixtures("caplog")
+    # def test_tracing_disabled_warning(self, enable_tracing, want_warning, caplog):
+    #     app = reasoning_engines.AdkApp(
+    #         agent=Agent(name=_TEST_AGENT_NAME, model=_TEST_MODEL),
+    #         enable_tracing=enable_tracing
+    #     )
+    #     assert (
+    #         "[WARNING] Your 'enable_tracing=False' setting" in caplog.text
+    #     ) == want_warning
+
 
 def test_dump_event_for_json():
     from google.adk.events import event
diff --git a/vertexai/agent_engines/templates/adk.py b/vertexai/agent_engines/templates/adk.py
index db1b1ff423..4176b58e4a 100644
--- a/vertexai/agent_engines/templates/adk.py
+++ b/vertexai/agent_engines/templates/adk.py
@@ -724,6 +724,32 @@ def set_up(self):
 
         custom_instrumentor = self._tmpl_attrs.get("instrumentor_builder")
 
+        if self._tmpl_attrs.get("enable_tracing") is False:
+            _warn(
+                (
+                    "Your 'enable_tracing=False' setting is being deprecated "
+                    "and will be removed in a future release.\n"
+                    "This legacy setting overrides the new Cloud Console "
+                    "toggle and environment variable controls.\n"
+                    "Impact: The Cloud Console may incorrectly show telemetry "
+                    "as 'On' when it is actually 'Off', and the UI toggle will "
+                    "not work.\n"
+                    "Action: To fix this and control telemetry, please remove "
+                    "the 'enable_tracing' parameter from your deployment "
+                    "code.\n"
+                    "You can then use the "
+                    "'GOOGLE_CLOUD_AGENT_ENGINE_ENABLE_TELEMETRY' "
+                    "environment variable:\n"
+                    "agent_engines.create(\n"
+                    "  env_vars={\n"
+                    '    "GOOGLE_CLOUD_AGENT_ENGINE_ENABLE_TELEMETRY": true|false\n'
+                    "  }\n"
+                    ")\n"
+                    "or the toggle in the Cloud Console: "
+                    "https://console.cloud.google.com/vertex-ai/agents."
+                ),
+            )
+
         if custom_instrumentor and self._tracing_enabled():
             self._tmpl_attrs["instrumentor"] = custom_instrumentor(project)
 
diff --git a/vertexai/preview/reasoning_engines/templates/adk.py b/vertexai/preview/reasoning_engines/templates/adk.py
index eefe01ed53..8b49b992c6 100644
--- a/vertexai/preview/reasoning_engines/templates/adk.py
+++ b/vertexai/preview/reasoning_engines/templates/adk.py
@@ -657,6 +657,32 @@ def set_up(self):
         else:
             os.environ["ADK_CAPTURE_MESSAGE_CONTENT_IN_SPANS"] = "false"
 
+        if self._tmpl_attrs.get("enable_tracing") is False:
+            _warn(
+                (
+                    "Your 'enable_tracing=False' setting is being deprecated "
+                    "and will be removed in a future release.\n"
+                    "This legacy setting overrides the new Cloud Console "
+                    "toggle and environment variable controls.\n"
+                    "Impact: The Cloud Console may incorrectly show telemetry "
+                    "as 'On' when it is actually 'Off', and the UI toggle will "
+                    "not work.\n"
+                    "Action: To fix this and control telemetry, please remove "
+                    "the 'enable_tracing' parameter from your deployment "
+                    "code.\n"
+                    "You can then use the "
+                    "'GOOGLE_CLOUD_AGENT_ENGINE_ENABLE_TELEMETRY' "
+                    "environment variable:\n"
+                    "agent_engines.create(\n"
+                    "  env_vars={\n"
+                    '    "GOOGLE_CLOUD_AGENT_ENGINE_ENABLE_TELEMETRY": true|false\n'
+                    "  }\n"
+                    ")\n"
+                    "or the toggle in the Cloud Console: "
+                    "https://console.cloud.google.com/vertex-ai/agents."
+                ),
+            )
+
         enable_logging = bool(self._telemetry_enabled())
 
         self._tmpl_attrs["instrumentor"] = _default_instrumentor_builder(