Vertex AI Search tool is not working

[Hetul-Patel-itp]

Hey everyone 👋

I'm trying to use VertexAiSearchTool with an LlmAgent to query a SharePoint Online federated connector datastore, but it’s not working properly.

The agent simply returns an empty response with no errors, which makes debugging quite difficult since it's a silent failure.

Datastore path:

projects/{project}/locations/global/collections/default_collection/dataStores/{id}-sharepoint-federated_{id}_file

Environment setup:

GOOGLE_CLOUD_LOCATION = us-central1
GOOGLE_GENAI_USE_VERTEXAI = True
Model: gemini-2.0-flash

---

Observed behavior:

When running the agent getting this below output.

--- Running Vertex AI Search Agent ---
Query: Receiving the company asset (Laptop)
Agent Response: ```

--- Full Event Details ---
model_version='gemini-2.0-flash' content=Content(
  parts=[
    Part(
      text="""```
"""
    ),
  ],
  role='model'
) grounding_metadata=GroundingMetadata(
  retrieval_metadata=RetrievalMetadata(),
  retrieval_queries=[                                                                                                 pted=None custom_metadata=None usage_metadata=GenerateContentResponseUsageMetadata(
  candidates_token_count=2,
      modality=<MediaModality.TEXT: 'TEXT'>,
      modality=<MediaModality.TEXT: 'TEXT'>,
      token_count=82
    ),
  ],
  total_token_count=84,
  traffic_type=<TrafficType.ON_DEMAND: 'ON_DEMAND'>
) live_session_resumption_update=None input_transcription=None output_transcription=None avg_logprobs=None logprobs_result=None cache_metadata=None citation_metadata=None interaction_id=None invocation_id='e-634215e7-5ea8-4ea3-a77e-228ed0aaa346' author='docs_qa_agent' actions=EventActions(skip_summarization=None, state_delta={}, artifact_delta={}, transfer_to_agent=None, escalate=None, requested_auth_configs={}, requested_tool_confirmations={}, compaction=None, end_of_agent=None, agent_state=None, rewind_before_invocation_id=None) long_running_tool_ids=None branch=None id='6c185527-0bf6-4ead-a1eb-c30696b09bca' timestamp=1774464897.586301

------------------------------
   

**Questions:** 

1. Does **VertexAiSearchTool** support federated connectors like SharePoint and OneDrive? 
2. Could this behavior indicate a configuration issue, or is this a known limitation? 
3. Is there any additional authentication required for a federated SharePoint connector? 

Any guidance would be really helpful. Thanks!