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

@@ -13,6 +13,12 @@ public sealed class ToolSettingsFieldDefinition
     [JsonPropertyName("enum")]
     public List<string> EnumValues { get; init; } = [];
 
+    /// <summary>
+    /// Value shown and saved for an optional choice when no value has been stored yet.
+    /// A choice with a default does not offer a separate "Not set" option.
+    /// </summary>
+    public string DefaultValue { get; init; } = string.Empty;
+
     /// <summary>
     /// Name of a list of options the app maintains, as an alternative to spelling them out in
     /// the enum field. See the tool settings option sources for the available names.
@@ -44,4 +50,4 @@ public sealed class ToolSettingsFieldDefinition
     public IReadOnlyList<ToolSettingsOption> GetOptions() => string.IsNullOrWhiteSpace(this.OptionSource)
         ? this.EnumValues.Select(value => new ToolSettingsOption(value, value)).ToList()
         : ToolSettingsOptionSources.Resolve(this.OptionSource);
-}
+}