Added a semantic search tool (#1005)

app/MindWork AI Studio/Settings/DataModel/DataSourceRetrievalMode.cs

@@ -0,0 +1,21 @@
+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// How the data sources of a chat are searched.
+/// </summary>
+public enum DataSourceRetrievalMode
+{
+    /// <summary>
+    /// The model searches the data sources itself, through the tool semantic_search, whenever a
+    /// question calls for it. No agent takes part: the chat model picks the data sources and
+    /// judges what it found.
+    /// </summary>
+    SEMANTIC_SEARCH,
+
+    /// <summary>
+    /// AI Studio searches the data sources with every message, before the model answers. This is
+    /// the classic RAG process, with its agents for selecting data sources and for validating what
+    /// was found.
+    /// </summary>
+    EVERY_MESSAGE,
+}