diff --git a/src/google/adk/cli/cli_eval.py b/src/google/adk/cli/cli_eval.py
index 33c1693208..e82f444993 100644
--- a/src/google/adk/cli/cli_eval.py
+++ b/src/google/adk/cli/cli_eval.py
@@ -24,7 +24,7 @@
 import click
 from google.genai import types as genai_types
 
-from ..agents.llm_agent import Agent
+from ..agents.base_agent import BaseAgent
 from ..evaluation.base_eval_service import BaseEvalService
 from ..evaluation.base_eval_service import EvaluateConfig
 from ..evaluation.base_eval_service import EvaluateRequest
@@ -86,11 +86,18 @@ def get_default_metric_info(
   )
 
 
-def get_root_agent(agent_module_file_path: str) -> Agent:
+async def get_root_agent(agent_module_file_path: str) -> BaseAgent:
   """Returns root agent given the agent module."""
   agent_module = _get_agent_module(agent_module_file_path)
-  root_agent = agent_module.agent.root_agent
-  return root_agent
+  agent_module_with_agent = getattr(agent_module, "agent", agent_module)
+  if hasattr(agent_module_with_agent, "root_agent"):
+    return agent_module_with_agent.root_agent
+  elif hasattr(agent_module_with_agent, "get_agent_async"):
+    root_agent, _ = await agent_module_with_agent.get_agent_async()
+    return root_agent
+  raise ValueError(
+      "Agent module should have either `root_agent` or `get_agent_async`."
+  )
 
 
 def try_get_reset_func(agent_module_file_path: str) -> Any:
diff --git a/src/google/adk/cli/cli_tools_click.py b/src/google/adk/cli/cli_tools_click.py
index 5b5d3e5c82..fec7dd5a1a 100644
--- a/src/google/adk/cli/cli_tools_click.py
+++ b/src/google/adk/cli/cli_tools_click.py
@@ -812,7 +812,7 @@ def cli_eval(
   print(f"Using evaluation criteria: {eval_config}")
   eval_metrics = get_eval_metrics_from_config(eval_config)
 
-  root_agent = get_root_agent(agent_module_file_path)
+  root_agent = asyncio.run(get_root_agent(agent_module_file_path))
   app_name = os.path.basename(agent_module_file_path)
   agents_dir = os.path.dirname(agent_module_file_path)
   eval_sets_manager = None
diff --git a/tests/unittests/cli/utils/test_cli_eval.py b/tests/unittests/cli/utils/test_cli_eval.py
index c6d21fa707..c5f9d1918a 100644
--- a/tests/unittests/cli/utils/test_cli_eval.py
+++ b/tests/unittests/cli/utils/test_cli_eval.py
@@ -19,6 +19,8 @@
 from types import SimpleNamespace
 from unittest import mock
 
+import pytest
+
 
 def test_get_eval_sets_manager_local(monkeypatch):
   mock_local_manager = mock.MagicMock()
@@ -49,3 +51,46 @@ def test_get_eval_sets_manager_gcs(monkeypatch):
   )
   assert manager == mock_gcs_manager
   mock_create_gcs.assert_called_once_with("gs://bucket")
+
+
+@pytest.mark.asyncio
+async def test_get_root_agent_supports_root_agent(monkeypatch):
+  root_agent = mock.MagicMock()
+  agent_module = SimpleNamespace(agent=SimpleNamespace(root_agent=root_agent))
+  monkeypatch.setattr(
+      "google.adk.cli.cli_eval._get_agent_module",
+      lambda _agent_module_file_path: agent_module,
+  )
+  from google.adk.cli.cli_eval import get_root_agent
+
+  assert await get_root_agent("some/dir") == root_agent
+
+
+@pytest.mark.asyncio
+async def test_get_root_agent_supports_get_agent_async(monkeypatch):
+  root_agent = mock.MagicMock()
+  get_agent_async = mock.AsyncMock(return_value=(root_agent, object()))
+  agent_module = SimpleNamespace(
+      agent=SimpleNamespace(get_agent_async=get_agent_async)
+  )
+  monkeypatch.setattr(
+      "google.adk.cli.cli_eval._get_agent_module",
+      lambda _agent_module_file_path: agent_module,
+  )
+  from google.adk.cli.cli_eval import get_root_agent
+
+  assert await get_root_agent("some/dir") == root_agent
+  get_agent_async.assert_awaited_once()
+
+
+@pytest.mark.asyncio
+async def test_get_root_agent_raises_without_supported_entrypoint(monkeypatch):
+  agent_module = SimpleNamespace(agent=SimpleNamespace())
+  monkeypatch.setattr(
+      "google.adk.cli.cli_eval._get_agent_module",
+      lambda _agent_module_file_path: agent_module,
+  )
+  from google.adk.cli.cli_eval import get_root_agent
+
+  with pytest.raises(ValueError, match="root_agent|get_agent_async"):
+    await get_root_agent("some/dir")
diff --git a/tests/unittests/cli/utils/test_cli_tools_click.py b/tests/unittests/cli/utils/test_cli_tools_click.py
index 5977f90dd7..0ebd181dd2 100644
--- a/tests/unittests/cli/utils/test_cli_tools_click.py
+++ b/tests/unittests/cli/utils/test_cli_tools_click.py
@@ -59,7 +59,9 @@ def mock_load_eval_set_from_file():
 
 @pytest.fixture
 def mock_get_root_agent():
-  with mock.patch("google.adk.cli.cli_eval.get_root_agent") as mock_func:
+  with mock.patch(
+      "google.adk.cli.cli_eval.get_root_agent", new_callable=mock.AsyncMock
+  ) as mock_func:
     mock_func.return_value = root_agent
     yield mock_func