Fixing some things left over

app/MindWork AI Studio/Provider/Model.cs

@@ -1,3 +1,5 @@
+using System.Text.Json.Serialization;
+
 using AIStudio.Tools.PluginSystem;
 
 namespace AIStudio.Provider;
@@ -20,6 +22,12 @@ public readonly record struct Model(string Id, string? DisplayName)
     /// </summary>
     public static readonly Model SYSTEM_MODEL = new(SYSTEM_MODEL_ID, null);
 
+    /// <summary>
+    /// The provider-reported default reasoning behavior, when the model catalog supplies it.
+    /// </summary>
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
+    public ModelReasoningBehavior ReasoningBehavior { get; init; }
+
     /// <summary>
     /// Checks if this model is the system-configured placeholder.
     /// </summary>
@@ -71,4 +79,15 @@ public readonly record struct Model(string Id, string? DisplayName)
     public override int GetHashCode() => this.Id?.GetHashCode(StringComparison.Ordinal) ?? 0;
 
     #endregion
-}
+}
+
+/// <summary>
+/// Describes the default reasoning behavior reported by a provider's model catalog.
+/// </summary>
+public enum ModelReasoningBehavior
+{
+    UNKNOWN,
+    OPTIONAL,
+    DEFAULT_ON,
+    ALWAYS_ON,
+}

app/MindWork AI Studio/Provider/OpenAI/ResponsesToolCallingAdapter.cs

@@ -15,6 +15,8 @@ public sealed class ResponsesToolCallingAdapter(Model chatModel, IList<object> b
     IReadOnlyList<(ToolDefinition Definition, IToolImplementation Implementation)> runnableTools,
     Func<ResponsesAPIRequest, CancellationToken, Task<ResponsesResponse?>> executeRequestAsync) : IToolCallingProviderAdapter
 {
+    private const string ENCRYPTED_REASONING_INCLUDE = "reasoning.encrypted_content";
+
     private readonly List<object> internalItems = [];
     private ResponsesResponse? lastResponse;
 
@@ -48,7 +50,7 @@ public sealed class ResponsesToolCallingAdapter(Model chatModel, IList<object> b
             Stream = false,
             Store = false,
             Tools = includeTools ? this.effectiveProviderTools : [],
-            AdditionalApiParameters = apiParameters,
+            AdditionalApiParameters = IncludeEncryptedReasoning(apiParameters),
         }, token);
 
         if (response is null)
@@ -92,6 +94,37 @@ public sealed class ResponsesToolCallingAdapter(Model chatModel, IList<object> b
         Output = content,
     });
 
+    /// <summary>
+    /// Request encrypted reasoning content without replacing any additional output data selected by the user.
+    /// </summary>
+    /// <remarks>
+    /// Tool rounds use stateless Responses requests. OpenAI requires encrypted reasoning items in that mode
+    /// so that the complete output can be passed back with the tool result on the next round.
+    /// </remarks>
+    private static IDictionary<string, object> IncludeEncryptedReasoning(IDictionary<string, object> apiParameters)
+    {
+        var result = new Dictionary<string, object>(apiParameters);
+        var includeKey = result.Keys.FirstOrDefault(key => key.Equals("include", StringComparison.OrdinalIgnoreCase));
+        if (includeKey is null)
+        {
+            result["include"] = new List<object> { ENCRYPTED_REASONING_INCLUDE };
+            return result;
+        }
+
+        var includedOutput = result[includeKey] switch
+        {
+            IEnumerable<object> values => values.ToList(),
+            string value => new List<object> { value },
+            _ => [],
+        };
+
+        if (!includedOutput.Any(value => string.Equals(value as string, ENCRYPTED_REASONING_INCLUDE, StringComparison.Ordinal)))
+            includedOutput.Add(ENCRYPTED_REASONING_INCLUDE);
+
+        result[includeKey] = includedOutput;
+        return result;
+    }
+
     private static IList<object> BuildEffectiveProviderTools(IList<object> providerTools, IReadOnlyList<(ToolDefinition Definition, IToolImplementation Implementation)> runnableTools)
     {
         var localFunctionNames = runnableTools

app/MindWork AI Studio/Provider/OpenAI/ThinkingContent.cs

@@ -9,10 +9,10 @@ internal static class ThinkingContent
 {
     public static string Get(string? reasoningContent, string? reasoning, IEnumerable<JsonElement>? reasoningDetails)
     {
-        if (!string.IsNullOrWhiteSpace(reasoningContent))
+        if (!string.IsNullOrEmpty(reasoningContent))
             return reasoningContent;
 
-        if (!string.IsNullOrWhiteSpace(reasoning))
+        if (!string.IsNullOrEmpty(reasoning))
             return reasoning;
 
         if (reasoningDetails is null)

app/MindWork AI Studio/Provider/OpenRouter/OpenRouterModel.cs

@@ -5,4 +5,24 @@ namespace AIStudio.Provider.OpenRouter;
 /// </summary>
 /// <param name="Id">The model's ID.</param>
 /// <param name="Name">The model's human-readable display name.</param>
-public readonly record struct OpenRouterModel(string Id, string? Name);
+/// <param name="Reasoning">The model's provider-reported reasoning behavior.</param>
+public readonly record struct OpenRouterModel(string Id, string? Name, OpenRouterReasoning? Reasoning)
+{
+    public Model ToModel() => new(this.Id, this.Name)
+    {
+        ReasoningBehavior = this.Reasoning switch
+        {
+            { Mandatory: true } => ModelReasoningBehavior.ALWAYS_ON,
+            { DefaultEnabled: true } => ModelReasoningBehavior.DEFAULT_ON,
+            not null => ModelReasoningBehavior.OPTIONAL,
+            _ => ModelReasoningBehavior.UNKNOWN,
+        },
+    };
+}
+
+/// <summary>
+/// The reasoning defaults returned for a model by OpenRouter's model catalog.
+/// </summary>
+/// <param name="DefaultEnabled">Whether reasoning is enabled when the request does not configure it.</param>
+/// <param name="Mandatory">Whether reasoning cannot be disabled for the model.</param>
+public readonly record struct OpenRouterReasoning(bool DefaultEnabled, bool Mandatory);

app/MindWork AI Studio/Provider/OpenRouter/ProviderOpenRouter.cs

@@ -116,7 +116,7 @@ public sealed class ProviderOpenRouter() : BaseProvider(LLMProviders.OPEN_ROUTER
             storeType,
             "models",
             modelResponse => modelResponse.Data
-                .Select(n => new Model(n.Id, n.Name))
+                .Select(n => n.ToModel())
                 .Where(model => model.IsChatModel()),
             apiKeyProvisional,
             requestConfigurator: (request, secretKey) =>
@@ -133,7 +133,7 @@ public sealed class ProviderOpenRouter() : BaseProvider(LLMProviders.OPEN_ROUTER
         return this.LoadModelsResponse<OpenRouterModelsResponse>(
             SecretStoreType.EMBEDDING_PROVIDER,
             "embeddings/models",
-            modelResponse => modelResponse.Data.Select(n => new Model(n.Id, n.Name)),
+            modelResponse => modelResponse.Data.Select(n => n.ToModel()),
             apiKeyProvisional,
             requestConfigurator: (request, secretKey) =>
             {