diff --git a/.github/workflows/_test-unit-base.yml b/.github/workflows/_test-unit-base.yml
index c4045a08ffb..80d743c5ad7 100644
--- a/.github/workflows/_test-unit-base.yml
+++ b/.github/workflows/_test-unit-base.yml
@@ -112,7 +112,7 @@ jobs:
         if: steps.changes.outputs.decision != 'skip'
         timeout-minutes: 8
         run: |
-          .github/scripts/uv_sync_with_retries.sh --frozen --group ci --group proxy-dev --extra google --extra proxy --extra semantic-router --extra saml
+          .github/scripts/uv_sync_with_retries.sh --frozen --group ci --group proxy-dev --extra google --extra proxy --extra semantic-router --extra saml --extra mongodb
 
       - name: Cache Prisma binaries
         if: steps.changes.outputs.decision != 'skip'
diff --git a/tests/test_litellm/llms/mongodb/vector_stores/test_mongodb_transformation.py b/tests/test_litellm/llms/mongodb/vector_stores/test_mongodb_transformation.py
index e7ed3d77407..0e62e7c11d6 100644
--- a/tests/test_litellm/llms/mongodb/vector_stores/test_mongodb_transformation.py
+++ b/tests/test_litellm/llms/mongodb/vector_stores/test_mongodb_transformation.py
@@ -658,6 +658,19 @@ class TestClientKeyDerivation:
         assert key.socket_timeout_ms == 3_000
         assert key.connect_timeout_ms == 3_000
 
+    def test_a_short_timeout_also_shortens_server_selection(self):
+        """Server selection runs before the connect attempt, so leaving it at the 10s default
+        would let a caller asking for a 3s budget block for 10s before anything is tried."""
+        key = MongoDBVectorStoreConfig._client_key(_MongoDBSearchParams.model_validate(BASE_PARAMS), 3.0)
+
+        assert key.server_selection_timeout_ms == 3_000
+
+    def test_a_generous_timeout_does_not_raise_server_selection_above_the_default(self):
+        key = MongoDBVectorStoreConfig._client_key(_MongoDBSearchParams.model_validate(BASE_PARAMS), 120.0)
+
+        assert key.socket_timeout_ms == 120_000
+        assert key.server_selection_timeout_ms == 10_000
+
     def test_an_httpx_timeout_maps_connect_and_read_separately(self):
         key = MongoDBVectorStoreConfig._client_key(
             _MongoDBSearchParams.model_validate(BASE_PARAMS), httpx.Timeout(connect=2.0, read=45.0, write=5.0, pool=5.0)
@@ -693,6 +706,16 @@ class TestErrorTranslation:
 
         assert "sample_mflix.embedded_movies" in str(translated)
 
+    def test_code_13_alone_is_enough_without_a_recognisable_message(self):
+        """The other unauthorized case carries "not authorized", which the message markers also
+        match, so it cannot tell whether the code is still being checked at all."""
+        from pymongo.errors import OperationFailure
+
+        translated = self._translate(OperationFailure("user lacks privileges on this namespace", code=13))
+
+        assert "rejected the credentials" in str(translated)
+        assert "sample_mflix.embedded_movies" in str(translated)
+
     def test_a_missing_index_names_the_index_and_the_collection(self):
         from pymongo.errors import OperationFailure