diff --git a/src/google/adk/cli/cli_deploy.py b/src/google/adk/cli/cli_deploy.py
index 5082ba32..9b096d05 100644
--- a/src/google/adk/cli/cli_deploy.py
+++ b/src/google/adk/cli/cli_deploy.py
@@ -253,8 +253,8 @@ def to_agent_engine(
     temp_folder: str,
     adk_app: str,
     staging_bucket: str,
-    agent_engine_name: str,
     trace_to_cloud: bool,
+    agent_engine_id: Optional[str] = None,
     absolutize_imports: bool = True,
     project: Optional[str] = None,
     region: Optional[str] = None,
@@ -294,9 +294,9 @@ def to_agent_engine(
     project (str): Google Cloud project id.
     region (str): Google Cloud region.
     staging_bucket (str): The GCS bucket for staging the deployment artifacts.
-    agent_engine_name (str): The name of the Agent Engine instance to update if
-      it exists. Format: `projects/{project}/locations/{location}/reasoningEngines/{resource_id}`.
     trace_to_cloud (bool): Whether to enable Cloud Trace.
+    agent_engine_id (str): The ID of the Agent Engine instance to update. If not
+      specified, a new Agent Engine instance will be created.
     absolutize_imports (bool): Whether to absolutize imports. If True, all relative
       imports will be converted to absolute import statements. Default is True.
     requirements_file (str): The filepath to the `requirements.txt` file to use.
@@ -407,7 +407,7 @@ def to_agent_engine(
 
     click.echo('Deploying to agent engine...')
     agent_engine = agent_engines.ModuleAgent(
-        module_name='agent_engine_app',
+        module_name=adk_app,
         agent_name='adk_app',
         register_operations={
             '': [
@@ -425,7 +425,7 @@ def to_agent_engine(
             'async_stream': ['async_stream_query'],
             'stream': ['stream_query', 'streaming_agent_run_with_events'],
         },
-        sys_paths=[temp_folder],
+        sys_paths=[temp_folder[1:]],
     )
     agent_config = dict(
         agent_engine=agent_engine,
@@ -436,10 +436,11 @@ def to_agent_engine(
         extra_packages=[temp_folder],
     )
 
-    if not agent_engine_name:
+    if not agent_engine_id:
       agent_engines.create(**agent_config)
     else:
-      agent_engines.update(resource_name=agent_engine_name, **agent_config)
+      name = f'projects/{project}/locations/{region}/reasoningEngines/{agent_engine_id}'
+      agent_engines.update(resource_name=name, **agent_config)
   finally:
     click.echo(f'Cleaning up the temp folder: {temp_folder}')
     shutil.rmtree(temp_folder)
diff --git a/src/google/adk/cli/cli_tools_click.py b/src/google/adk/cli/cli_tools_click.py
index 4124be22..c0671c58 100644
--- a/src/google/adk/cli/cli_tools_click.py
+++ b/src/google/adk/cli/cli_tools_click.py
@@ -947,14 +947,14 @@ def cli_deploy_cloud_run(
     help="Required. GCS bucket for staging the deployment artifacts.",
 )
 @click.option(
-    "--agent_engine_name",
+    "--agent_engine_id",
     type=str,
     default=None,
     help=(
-        "Optional. Name of the Agent Engine instance to update if it exists"
+        "Optional. ID of the Agent Engine instance to update if it exists"
         " (default: None, which means a new instance will be created)."
-        " Format:"
-        " `projects/{project}/locations/{location}/reasoningEngines/{resource_id}`."
+        " The corresponding resource name in Agent Engine will be:"
+        " `projects/{project}/locations/{region}/reasoningEngines/{agent_engine_id}`."
     ),
 )
 @click.option(
@@ -1042,7 +1042,7 @@ def cli_deploy_agent_engine(
     project: str,
     region: str,
     staging_bucket: str,
-    agent_engine_name: Optional[str],
+    agent_engine_id: Optional[str],
     trace_to_cloud: bool,
     display_name: str,
     description: str,
@@ -1065,7 +1065,7 @@ def cli_deploy_agent_engine(
         project=project,
         region=region,
         staging_bucket=staging_bucket,
-        agent_engine_name=agent_engine_name,
+        agent_engine_id=agent_engine_id,
         trace_to_cloud=trace_to_cloud,
         display_name=display_name,
         description=description,
diff --git a/tests/unittests/cli/utils/test_cli_deploy.py b/tests/unittests/cli/utils/test_cli_deploy.py
index 958a3879..3b708d10 100644
--- a/tests/unittests/cli/utils/test_cli_deploy.py
+++ b/tests/unittests/cli/utils/test_cli_deploy.py
@@ -454,7 +454,6 @@ def test_to_agent_engine_happy_path(
       temp_folder=str(temp_folder),
       adk_app="my_adk_app",
       staging_bucket="gs://my-staging-bucket",
-      agent_engine_name="",
       trace_to_cloud=True,
       project="my-gcp-project",
       region="us-central1",