Added mailboxes as local data sources (#1022)

app/MindWork AI Studio/Tools/ToolCallingSystem/IToolCollection.cs

@@ -0,0 +1,20 @@
+namespace AIStudio.Tools.ToolCallingSystem;
+
+/// <summary>
+/// A tool collection written in C#: what it is, and how the app presents it.
+/// </summary>
+/// <remarks>
+/// Like a tool written in C#, a collection states its own definition, so no string key has to join
+/// a definition to its texts. Whether a collection exists right now is not its own question: it
+/// exists as long as one of its tools does, see IToolImplementation.IsAvailable.
+/// </remarks>
+public interface IToolCollection
+{
+    public ToolCollectionDefinition GetDefinition();
+
+    public string Icon { get; }
+
+    public string GetDisplayName();
+
+    public string GetDescription();
+}