diff --git a/google/genai/tests/interactions/test_agent_paths.py b/google/genai/tests/interactions/test_agent_paths.py
new file mode 100644
index 000000000..a81e68f28
--- /dev/null
+++ b/google/genai/tests/interactions/test_agent_paths.py
@@ -0,0 +1,104 @@
+
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+
+"""Tests for Agents CRUD URL paths on both GenAI and Vertex AI."""
+
+from unittest import mock
+import pytest
+from httpx import Request, Response, Client as HTTPClient
+from google.genai._interactions_private._client import GeminiNextGenAPIClient
+
+
+def _make_client(is_vertex):
+    """Create a private nextgen client configured for GenAI or Vertex."""
+    if is_vertex:
+        base_url = "https://us-central1-aiplatform.googleapis.com/"
+        api_version = "v1beta1"
+    else:
+        base_url = "https://generativelanguage.googleapis.com/"
+        api_version = "v1beta"
+
+    client = GeminiNextGenAPIClient(
+        base_url=base_url,
+        api_key="test-key",
+        api_version=api_version,
+    )
+    if is_vertex:
+        client._is_vertex = True
+        client._vertex_project = "test-project"
+        client._vertex_location = "us-central1"
+    return client
+
+
+@pytest.mark.parametrize("is_vertex", [True, False])
+def test_agents_create_path(is_vertex):
+    client = _make_client(is_vertex)
+    if is_vertex:
+        expected = "https://us-central1-aiplatform.googleapis.com/v1beta1/projects/test-project/locations/us-central1/agents"
+    else:
+        expected = "https://generativelanguage.googleapis.com/v1beta/agents"
+
+    with mock.patch.object(HTTPClient, "send") as mock_send:
+        mock_send.return_value = Response(200, request=Request('POST', ''), json={"id": "a"})
+        client.agents.create(id="a", base_agent="test")
+        request = mock_send.call_args[0][0]
+        assert str(request.url) == expected
+
+
+@pytest.mark.parametrize("is_vertex", [True, False])
+def test_agents_list_path(is_vertex):
+    client = _make_client(is_vertex)
+    if is_vertex:
+        expected = "https://us-central1-aiplatform.googleapis.com/v1beta1/projects/test-project/locations/us-central1/agents"
+    else:
+        expected = "https://generativelanguage.googleapis.com/v1beta/agents"
+
+    with mock.patch.object(HTTPClient, "send") as mock_send:
+        mock_send.return_value = Response(200, request=Request('GET', ''), json={"agents": []})
+        client.agents.list()
+        request = mock_send.call_args[0][0]
+        assert str(request.url) == expected
+
+
+@pytest.mark.parametrize("is_vertex", [True, False])
+def test_agents_get_path(is_vertex):
+    client = _make_client(is_vertex)
+    if is_vertex:
+        expected = "https://us-central1-aiplatform.googleapis.com/v1beta1/projects/test-project/locations/us-central1/agents/my-agent"
+    else:
+        expected = "https://generativelanguage.googleapis.com/v1beta/agents/my-agent"
+
+    with mock.patch.object(HTTPClient, "send") as mock_send:
+        mock_send.return_value = Response(200, request=Request('GET', ''), json={"id": "my-agent"})
+        client.agents.get(id="my-agent")
+        request = mock_send.call_args[0][0]
+        assert str(request.url) == expected
+
+
+@pytest.mark.parametrize("is_vertex", [True, False])
+def test_agents_delete_path(is_vertex):
+    client = _make_client(is_vertex)
+    if is_vertex:
+        expected = "https://us-central1-aiplatform.googleapis.com/v1beta1/projects/test-project/locations/us-central1/agents/my-agent"
+    else:
+        expected = "https://generativelanguage.googleapis.com/v1beta/agents/my-agent"
+
+    with mock.patch.object(HTTPClient, "send") as mock_send:
+        mock_send.return_value = Response(200, request=Request('DELETE', ''), json={})
+        client.agents.delete(id="my-agent")
+        request = mock_send.call_args[0][0]
+        assert str(request.url) == expected