Added a free address choice to the Read Web Page tool (#997)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

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

@@ -51,4 +51,24 @@ internal static class ToolSettingsValueParser
         error = string.Format(maximumErrorFormat, key, maximum);
         return false;
     }
+
+    /// <summary>
+    /// Checks that a stored value is one the option source still offers.
+    /// </summary>
+    /// <remarks>
+    /// An empty value passes: whether the field may be empty is decided by the settings schema's
+    /// required list, which the tool settings service checks before this method runs.<br/><br/>
+    /// The error text comes from the caller, like the other checks here, so that it is translated
+    /// in the tool which reports it. It receives the key as {0} and the stored value as {1}.
+    /// </remarks>
+    public static bool TryValidateOptionValue(IReadOnlyDictionary<string, string> settingsValues, string key, string optionSource, string invalidValueErrorFormat, out string error)
+    {
+        error = string.Empty;
+        var value = settingsValues.GetValueOrDefault(key);
+        if (string.IsNullOrWhiteSpace(value) || ToolSettingsOptionSources.GetValues(optionSource).Contains(value))
+            return true;
+
+        error = string.Format(invalidValueErrorFormat, key, value);
+        return false;
+    }
 }