Polish per-answer thinking disclosure

app/MindWork AI Studio/Chat/ContentBlockComponent.razor

@@ -226,8 +226,9 @@
                         }
                         else if (this.Content.IsStreaming)
                         {
+                            @* The think tags never reach the text: ContentText splits them off while streaming. *@
                             <MudText Typo="Typo.body1" Style="white-space: pre-wrap;">
-                                @textContent.Text.RemoveThinkTags()
+                                @textContent.Text
                             </MudText>
                         }
                         else

app/MindWork AI Studio/Chat/ContentText.cs

@@ -127,13 +127,19 @@ public sealed class ContentText : IContent
                         if (token.IsCancellationRequested)
                             break;
 
-                        // Stop the waiting animation:
-                        this.InitialRemoteWait = false;
                         this.IsStreaming = true;
 
                         // Add the response to the content:
                         this.ApplyStreamChunk(contentStreamChunk);
 
+                        //
+                        // Stop the waiting animation once the answer itself starts. A model which
+                        // is still reasoning has not written anything to read yet, and an empty
+                        // bubble would look like a finished, empty answer. The thinking section
+                        // is available next to the animation the whole time.
+                        //
+                        this.InitialRemoteWait = this.Text.Length is 0;
+
                         // Notify the UI that the content has changed,
                         // depending on the energy saving mode:
                         var now = DateTimeOffset.Now;

app/MindWork AI Studio/Provider/Anthropic/AnthropicResponse.cs

@@ -39,9 +39,16 @@ public sealed record AnthropicResponse
     /// <summary>
     /// The human-readable thinking the model returned, with redacted blocks omitted.
     /// </summary>
-    public string GetThinkingOutput() => string.Concat(this.Content
+    /// <remarks>
+    /// Each thinking block reads as its own paragraph, so they are joined as paragraphs
+    /// rather than run into one another.
+    /// </remarks>
+    public string GetThinkingOutput() => string.Join(
+        $"{Environment.NewLine}{Environment.NewLine}",
+        this.Content
             .Where(x => ReadString(x, "type").Equals("thinking", StringComparison.Ordinal))
-        .Select(x => ReadString(x, "thinking")));
+            .Select(x => ReadString(x, "thinking"))
+            .Where(x => !string.IsNullOrWhiteSpace(x)));
 
     private static string ReadString(JsonElement item, string propertyName)
     {

app/MindWork AI Studio/Provider/Anthropic/ResponseStreamLine.cs

@@ -16,8 +16,8 @@ public readonly record struct ResponseStreamLine(string Type, int Index, Delta D
     /// <inheritdoc />
     public ContentStreamChunk GetContent() => this.Delta.Type switch
     {
-        "thinking_delta" => new(string.Empty, this.Delta.Thinking, []),
-        _ => new(this.Delta.Text, string.Empty, []),
+        "thinking_delta" => new(string.Empty, [], this.Delta.Thinking),
+        _ => new(this.Delta.Text, []),
     };
 
     #region Implementation of IAnnotationStreamLine

app/MindWork AI Studio/Provider/BaseProvider.cs

@@ -1054,6 +1054,15 @@ public abstract class BaseProvider : IProvider, ISecretId
                                     """, StringComparison.InvariantCulture) ||
                 jsonData.StartsWith("""
                                     {"type":"response.reasoning_text.delta"
+                                    """, StringComparison.InvariantCulture) ||
+
+                //
+                // Not a delta of its own: it announces the next part of a reasoning summary.
+                // The stream carries no separator between those parts, so the stream line
+                // turns this event into the paragraph break between them.
+                //
+                jsonData.StartsWith("""
+                                    {"type":"response.reasoning_summary_part.added"
                                     """, StringComparison.InvariantCulture))
             {
                 TDelta? providerResponse;

app/MindWork AI Studio/Provider/ContentStreamChunk.cs

@@ -4,14 +4,10 @@ namespace AIStudio.Provider;
 /// A chunk of content from a content stream, along with its associated sources.
 /// </summary>
 /// <param name="Content">The text content of the chunk.</param>
-/// <param name="Thinking">The provider-exposed thinking content of the chunk.</param>
 /// <param name="Sources">The list of sources associated with the chunk.</param>
-public sealed record ContentStreamChunk(string Content, string Thinking, IList<ISource> Sources)
+/// <param name="Thinking">The provider-exposed thinking content of the chunk.</param>
+public sealed record ContentStreamChunk(string Content, IList<ISource> Sources, string Thinking = "")
 {
-    public ContentStreamChunk(string content, IList<ISource> sources) : this(content, string.Empty, sources)
-    {
-    }
-
     /// <summary>
     /// Implicit conversion to string.
     /// </summary>

app/MindWork AI Studio/Provider/Fireworks/ResponseStreamLine.cs

@@ -14,7 +14,7 @@ public readonly record struct ResponseStreamLine(string Id, string Object, uint
     public bool ContainsContent() => this != default && this.Choices.Count > 0;
 
     /// <inheritdoc />
-    public ContentStreamChunk GetContent() => new(this.Choices[0].Delta.Content, this.Choices[0].Delta.Thinking, []);
+    public ContentStreamChunk GetContent() => new(this.Choices[0].Delta.Content, [], this.Choices[0].Delta.Thinking);
 
     #region Implementation of IAnnotationStreamLine
 

app/MindWork AI Studio/Provider/Model.cs

@@ -25,6 +25,13 @@ public readonly record struct Model(string Id, string? DisplayName)
     /// <summary>
     /// The provider-reported default reasoning behavior, when the model catalog supplies it.
     /// </summary>
+    /// <remarks>
+    /// This travels with the selected model into the user's settings, so it is a copy of what the
+    /// catalog said when the user picked the model, not a live value. It is refreshed when the user
+    /// picks a model again. That is deliberate: the capability lookup works from the stored model
+    /// and must not depend on the provider being reachable. <see cref="ModelReasoningBehavior.UNKNOWN"/>
+    /// falls back to the model-name heuristics, which is also what every older settings file yields.
+    /// </remarks>
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
     public ModelReasoningBehavior ReasoningBehavior { get; init; }
 
@@ -80,14 +87,3 @@ public readonly record struct Model(string Id, string? DisplayName)
 
     #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/ModelReasoningBehavior.cs

@@ -0,0 +1,32 @@
+namespace AIStudio.Provider;
+
+/// <summary>
+/// Describes the default reasoning behavior reported by a provider's model catalog.
+/// </summary>
+/// <remarks>
+/// A catalog which reports this is more reliable than our model-name heuristics, so
+/// <see cref="Model.ReasoningBehavior"/> takes precedence over them. Not every provider
+/// reports it, which is what <see cref="UNKNOWN"/> stands for.
+/// </remarks>
+public enum ModelReasoningBehavior
+{
+    /// <summary>
+    /// The catalog said nothing about reasoning. The model-name heuristics decide.
+    /// </summary>
+    UNKNOWN,
+
+    /// <summary>
+    /// The model can reason, but does not unless the request asks for it.
+    /// </summary>
+    OPTIONAL,
+
+    /// <summary>
+    /// The model reasons unless the request switches it off.
+    /// </summary>
+    DEFAULT_ON,
+
+    /// <summary>
+    /// The model always reasons and it cannot be switched off.
+    /// </summary>
+    ALWAYS_ON,
+}

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

@@ -19,7 +19,7 @@ public record ChatCompletionDeltaStreamLine(string Id, string Object, uint Creat
     public bool ContainsContent() => this.Choices.Count > 0;
 
     /// <inheritdoc />
-    public ContentStreamChunk GetContent() => new(this.Choices[0].Delta.Content, this.Choices[0].Delta.Thinking, []);
+    public ContentStreamChunk GetContent() => new(this.Choices[0].Delta.Content, [], this.Choices[0].Delta.Thinking);
 
     #region Implementation of IAnnotationStreamLine
 

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

@@ -97,6 +97,11 @@ public sealed class ProviderOpenAI() : BaseProvider(LLMProviders.OPEN_AI, new Ur
         // Check if we are using the Responses API or the Chat Completion API:
         var usingResponsesAPI = modelCapabilities.Contains(Capability.RESPONSES_API);
 
+        // Whether the model reasons at all, no matter whether it may be switched off:
+        var isReasoningModel = modelCapabilities.Contains(Capability.ALWAYS_REASONING) ||
+                               modelCapabilities.Contains(Capability.REASONING_BY_DEFAULT) ||
+                               modelCapabilities.Contains(Capability.OPTIONAL_REASONING);
+        
         // Prepare the request path based on the API we are using:
         var requestPath = usingResponsesAPI ? "responses" : "chat/completions";
         
@@ -225,6 +230,7 @@ public sealed class ProviderOpenAI() : BaseProvider(LLMProviders.OPEN_AI, new Ur
         {
             var adapter = new ResponsesToolCallingAdapter(
                 chatModel,
+                isReasoningModel,
                 baseInput,
                 additionalApiParameters,
                 providerTools,

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

@@ -5,20 +5,37 @@ namespace AIStudio.Provider.OpenAI;
 /// </summary>
 /// <param name="Type">The type of the response.</param>
 /// <param name="Delta">The delta content of the response.</param>
+/// <param name="SummaryIndex">The reasoning summary part this line belongs to.</param>
 public record ResponsesDeltaStreamLine(
     string Type,
-    string? Delta) : IResponseStreamLine
+    string? Delta,
+    int SummaryIndex) : IResponseStreamLine
 {
+    private const string SUMMARY_PART_ADDED = "response.reasoning_summary_part.added";
+    private const string SUMMARY_TEXT_DELTA = "response.reasoning_summary_text.delta";
+    private const string REASONING_TEXT_DELTA = "response.reasoning_text.delta";
+
+    /// <summary>
+    /// Whether this line starts a reasoning summary part which follows an earlier one.
+    /// </summary>
+    /// <remarks>
+    /// A reasoning summary arrives as several parts, and each one reads as its own paragraph.
+    /// The stream carries no separator between them, so the boundary has to come from the
+    /// event which announces the next part.
+    /// </remarks>
+    private bool IsFollowUpSummaryPart => this.Type is SUMMARY_PART_ADDED && this.SummaryIndex > 0;
+
     #region Implementation of IResponseStreamLine
 
     /// <inheritdoc />
-    public bool ContainsContent() => this.Delta is not null;
+    public bool ContainsContent() => this.Delta is not null || this.IsFollowUpSummaryPart;
 
     /// <inheritdoc />
     public ContentStreamChunk GetContent() => this.Type switch
     {
-        "response.reasoning_summary_text.delta" or "response.reasoning_text.delta" => new(string.Empty, this.Delta ?? string.Empty, this.GetSources()),
-        _ => new(this.Delta ?? string.Empty, string.Empty, this.GetSources()),
+        SUMMARY_PART_ADDED => new(string.Empty, this.GetSources(), this.IsFollowUpSummaryPart ? $"{Environment.NewLine}{Environment.NewLine}" : string.Empty),
+        SUMMARY_TEXT_DELTA or REASONING_TEXT_DELTA => new(string.Empty, this.GetSources(), this.Delta ?? string.Empty),
+        _ => new(this.Delta ?? string.Empty, this.GetSources()),
     };
 
     //

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

@@ -42,11 +42,23 @@ public sealed record ResponsesResponse
             }));
     }
 
-    public string GetThinkingOutput() => string.Concat(this.Output
+    /// <summary>
+    /// The human-readable thinking the model returned.
+    /// </summary>
+    /// <remarks>
+    /// A reasoning item carries its summary and its raw text as arrays of parts, and each part
+    /// reads as its own paragraph. The API states no separator between them, so we join them
+    /// as paragraphs instead of running them into one another.
+    /// </remarks>
+    public string GetThinkingOutput() => JoinParagraphs(this.Output
         .Where(x => ReadString(x, "type").Equals("reasoning", StringComparison.Ordinal))
         .SelectMany(x => ReadArrayItems(x, "summary").Concat(ReadArrayItems(x, "content")))
         .Select(x => ReadString(x, "text")));
 
+    private static string JoinParagraphs(IEnumerable<string> parts) => string.Join(
+        $"{Environment.NewLine}{Environment.NewLine}",
+        parts.Where(part => !string.IsNullOrWhiteSpace(part)));
+
     public IReadOnlyList<Source> GetSources() => this.Output
         .Where(x => ReadString(x, "type").Equals("message", StringComparison.Ordinal))
         .SelectMany(ReadContentItems)

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

@@ -11,7 +11,7 @@ namespace AIStudio.Provider.OpenAI;
 /// correlated by call ID. Unlike Chat Completions, the whole output of a round has to be sent
 /// back for the next one, reasoning items included, or the API refuses to continue.
 /// </remarks>
-public sealed class ResponsesToolCallingAdapter(Model chatModel, IList<object> baseInput, IDictionary<string, object> apiParameters, IList<object> providerTools,
+public sealed class ResponsesToolCallingAdapter(Model chatModel, bool isReasoningModel, IList<object> baseInput, IDictionary<string, object> apiParameters, IList<object> providerTools,
     IReadOnlyList<(ToolDefinition Definition, IToolImplementation Implementation)> runnableTools,
     Func<ResponsesAPIRequest, CancellationToken, Task<ResponsesResponse?>> executeRequestAsync) : IToolCallingProviderAdapter
 {
@@ -50,7 +50,7 @@ public sealed class ResponsesToolCallingAdapter(Model chatModel, IList<object> b
             Stream = false,
             Store = false,
             Tools = includeTools ? this.effectiveProviderTools : [],
-            AdditionalApiParameters = IncludeEncryptedReasoning(apiParameters),
+            AdditionalApiParameters = isReasoningModel ? IncludeEncryptedReasoning(apiParameters) : apiParameters,
         }, token);
 
         if (response is null)
@@ -99,7 +99,8 @@ public sealed class ResponsesToolCallingAdapter(Model chatModel, IList<object> b
     /// </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.
+    /// so that the complete output can be passed back with the tool result on the next round.<br/><br/>
+    /// Only a reasoning model gets this, because the include is meaningless for every other one.
     /// </remarks>
     private static IDictionary<string, object> IncludeEncryptedReasoning(IDictionary<string, object> apiParameters)
     {
@@ -111,11 +112,15 @@ public sealed class ResponsesToolCallingAdapter(Model chatModel, IList<object> b
             return result;
         }
 
+        //
+        // Whatever the user put there stays. A value we cannot read as a list is kept as the
+        // single entry it appears to be: the API rejecting the user's own value is the honest
+        // outcome, while dropping it here would hide the mistake behind a request that works.
+        //
         var includedOutput = result[includeKey] switch
         {
             IEnumerable<object> values => values.ToList(),
-            string value => new List<object> { value },
-            _ => [],
+            var value => [value],
         };
 
         if (!includedOutput.Any(value => string.Equals(value as string, ENCRYPTED_REASONING_INCLUDE, StringComparison.Ordinal)))

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

@@ -8,6 +8,9 @@ namespace AIStudio.Provider.OpenRouter;
 /// <param name="Reasoning">The model's provider-reported reasoning behavior.</param>
 public readonly record struct OpenRouterModel(string Id, string? Name, OpenRouterReasoning? Reasoning)
 {
+    /// <summary>
+    /// Converts the catalog entry into the model the rest of the app works with.
+    /// </summary>
     public Model ToModel() => new(this.Id, this.Name)
     {
         ReasoningBehavior = this.Reasoning switch
@@ -19,10 +22,3 @@ public readonly record struct OpenRouterModel(string Id, string? Name, OpenRoute
         },
     };
 }
-
-/// <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/OpenRouterReasoning.cs

@@ -0,0 +1,12 @@
+namespace AIStudio.Provider.OpenRouter;
+
+/// <summary>
+/// The reasoning defaults returned for a model by OpenRouter's model catalog.
+/// </summary>
+/// <remarks>
+/// The catalog reports more than this, such as the supported efforts and the default one.
+/// We read only what decides the model's reasoning capability today.
+/// </remarks>
+/// <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/Perplexity/ResponseStreamLine.cs

@@ -15,7 +15,7 @@ public readonly record struct ResponseStreamLine(string Id, string Object, uint
     public bool ContainsContent() => this != default && this.Choices.Count > 0;
 
     /// <inheritdoc />
-    public ContentStreamChunk GetContent() => new(this.Choices[0].Delta.Content, this.Choices[0].Delta.Thinking, this.GetSources());
+    public ContentStreamChunk GetContent() => new(this.Choices[0].Delta.Content, this.GetSources(), this.Choices[0].Delta.Thinking);
     
     /// <inheritdoc />
     public bool ContainsSources() => this != default && this.SearchResults.Count > 0;

app/MindWork AI Studio/Settings/ProviderExtensions.Reasoning.cs

@@ -73,9 +73,7 @@ public static partial class ProviderExtensions
 
         return provider.UsedLLMProvider switch
         {
-            LLMProviders.OPEN_AI => MergeReasoningStates(
-                GetOpenAICompatibleReasoningState(parameters),
-                GetReasoningEffortState(parameters)),
+            LLMProviders.OPEN_AI => GetOpenAICompatibleReasoningState(parameters),
 
             LLMProviders.ANTHROPIC => GetAnthropicReasoningState(parameters),
 
@@ -101,7 +99,6 @@ public static partial class ProviderExtensions
                 LLMProviders.HELMHOLTZ or
                 LLMProviders.GWDG => MergeReasoningStates(
                     GetOpenAICompatibleReasoningState(parameters),
-                    GetReasoningEffortState(parameters),
                     GetQwenReasoningState(parameters),
                     GetGoogleReasoningState(parameters)),
 
@@ -119,14 +116,12 @@ public static partial class ProviderExtensions
 
                 Host.VLLM => MergeReasoningStates(
                     GetOpenAICompatibleReasoningState(parameters),
-                    GetReasoningEffortState(parameters),
                     GetVllmReasoningState(parameters),
                     GetQwenReasoningState(parameters),
                     GetGoogleReasoningState(parameters)),
 
                 _ => MergeReasoningStates(
                     GetOpenAICompatibleReasoningState(parameters),
-                    GetReasoningEffortState(parameters),
                     GetQwenReasoningState(parameters),
                     GetGoogleReasoningState(parameters)),
             },
@@ -142,7 +137,8 @@ public static partial class ProviderExtensions
     /// <returns>The detected reasoning configuration state.</returns>
     /// <remarks>
     /// OpenAI-compatible providers commonly use a nested <c>reasoning</c> object and/or
-    /// a top-level <c>reasoning_effort</c> parameter.
+    /// a top-level <c>reasoning_effort</c> parameter. Both are covered here, so a caller
+    /// does not merge <see cref="GetReasoningEffortState"/> on top of this one again.
     /// </remarks>
     private static ReasoningConfigurationState GetOpenAICompatibleReasoningState(IDictionary<string, object> parameters)
     {

app/MindWork AI Studio/Tools/AIJobs/AIJobService.cs

@@ -396,10 +396,12 @@ public sealed class AIJobService(SettingsManager settingsManager, MessageBus mes
                 return false;
 
             var aiText = state.ChatGenerationRequest.AIText;
-            aiText.InitialRemoteWait = false;
             aiText.IsStreaming = true;
             aiText.ApplyStreamChunk(contentStreamChunk);
 
+            // The waiting animation stays until the answer itself starts, cf. ContentText:
+            aiText.InitialRemoteWait = aiText.Text.Length is 0;
+
             if (state.Snapshot.Status is not AIJobStatus.RUNNING)
             {
                 state.Snapshot = state.Snapshot with

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

@@ -51,7 +51,7 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
             if (!string.IsNullOrWhiteSpace(round.ThinkingOutput))
             {
                 var separator = hasThinkingOutput ? $"{Environment.NewLine}{Environment.NewLine}" : string.Empty;
-                yield return new ContentStreamChunk(string.Empty, $"{separator}{round.ThinkingOutput}", []);
+                yield return new ContentStreamChunk(string.Empty, [], $"{separator}{round.ThinkingOutput}");
                 hasThinkingOutput = true;
             }