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google__adk-docs/docs/integrations/vertex-ai-rag-engine.md
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Vertex AI RAG Engine Perform private data retrieval using Vertex AI RAG Engine /adk-docs/integrations/assets/vertex-ai.png
data
google

Vertex AI RAG Engine tool for ADK

Supported in ADKPython v0.1.0Java v0.2.0

The vertex_ai_rag_retrieval tool allows the agent to perform private data retrieval using Vertex AI RAG Engine.

When you use grounding with Vertex AI RAG Engine, you need to prepare a RAG corpus beforehand. Please refer to the RAG ADK agent sample or Vertex AI RAG Engine page for setting it up.

!!! warning "Warning: Single tool per agent limitation"

This tool can only be used ***by itself*** within an agent instance.
For more information about this limitation and workarounds, see
[Limitations for ADK tools](/adk-docs/tools/limitations/).

=== "Python"

```py
--8<-- "examples/python/snippets/tools/built-in-tools/vertexai_rag_engine.py"
```