https://adk-es.fabian-castro-c.dev/api-reference/java/com/google/adk/tools/retrieval/BaseRetrievalTool.html
BaseRetrievalTool (Google Agent Development Kit Maven Parent POM 0.2.1-SNAPSHOT API)
declaration: package: com.google.adk.tools.retrieval, class: BaseRetrievalTool
agent development kit