Add per-answer thinking disclosure

app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoop.cs

@@ -28,6 +28,7 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
         var toolCallCount = 0;
         var toolResultCharacterCount = 0L;
         var toolSources = new List<Source>();
+        var hasThinkingOutput = false;
 
         while (true)
         {
@@ -47,6 +48,13 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
 
             toolSources.MergeSources(round.Sources);
 
+            if (!string.IsNullOrWhiteSpace(round.ThinkingOutput))
+            {
+                var separator = hasThinkingOutput ? $"{Environment.NewLine}{Environment.NewLine}" : string.Empty;
+                yield return new ContentStreamChunk(string.Empty, $"{separator}{round.ThinkingOutput}", []);
+                hasThinkingOutput = true;
+            }
+
             //
             // A call without an ID cannot be answered: the provider correlates the result by that
             // ID, and inventing one would have the next request rejected. Nothing can be salvaged
@@ -168,4 +176,4 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
     private static string GetDisplayName(ToolCallingLoopContext context, string toolName) => context.RunnableTools
             .FirstOrDefault(tool => tool.Definition.Function.Name.Equals(toolName, StringComparison.Ordinal))
             .Implementation?.GetDisplayName() ?? toolName;
-}
+}

app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingRound.cs

@@ -5,6 +5,7 @@ namespace AIStudio.Tools.ToolCallingSystem.Harness;
 /// longer depends on the provider API it came from.
 /// </summary>
 /// <param name="TextOutput">The text the model produced, empty when it only requested tool calls.</param>
+/// <param name="ThinkingOutput">The human-readable thinking the provider exposed.</param>
 /// <param name="Calls">The tool calls the model requested, empty when it answered instead.</param>
 /// <param name="Sources">Sources the provider itself attached, such as those of a provider-native web search.</param>
-public sealed record ToolCallingRound(string TextOutput, IReadOnlyList<ToolCallingRequestedCall> Calls, IReadOnlyList<ISource> Sources);
+public sealed record ToolCallingRound(string TextOutput, string ThinkingOutput, IReadOnlyList<ToolCallingRequestedCall> Calls, IReadOnlyList<ISource> Sources);