Respect reasoning configuration for reasoning icon determination

app/MindWork AI Studio/Components/ProviderSelection.razor.cs

@@ -69,12 +69,20 @@ public partial class ProviderSelection : MSGComponentBase
         if (capabilities.Contains(Capability.SPEECH_INPUT))
             capabilityIcons.Add(new(Icons.Material.Filled.Mic, this.T("Speech input possible")));
 
-        if (capabilities.Contains(Capability.ALWAYS_REASONING))
+        var reasoningIndicatorState = provider.GetReasoningIndicatorState();
-            capabilityIcons.Add(new(Icons.Material.Filled.Psychology, this.T("Supports reasoning")));
+        if (reasoningIndicatorState is not ReasoningIndicatorState.NONE)
+            capabilityIcons.Add(new(Icons.Material.Filled.Psychology, this.GetReasoningTooltip(reasoningIndicatorState)));
 
         return capabilityIcons;
     }
 
+    private string GetReasoningTooltip(ReasoningIndicatorState reasoningIndicatorState) => reasoningIndicatorState switch
+    {
+        ReasoningIndicatorState.DEFAULT_ON => this.T("Uses reasoning by default"),
+        ReasoningIndicatorState.CONFIGURED => this.T("Uses reasoning from provider settings"),
+        _ => this.T("Uses reasoning"),
+    };
+    
     [SuppressMessage("Usage", "MWAIS0001:Direct access to `Providers` is not allowed")]
     private IEnumerable<AIStudio.Settings.Provider> GetAvailableProviders()
     {

app/MindWork AI Studio/Plugins/configuration/plugin.lua

@@ -70,6 +70,7 @@ CONFIG["LLM_PROVIDERS"] = {}
 --     -- Please refer to the documentation of the selected host for details.
 --     -- Might be something like ... \"temperature\": 0.5 ... for one parameter.
 --     -- Could be something like ... \"temperature\": 0.5, \"max_tokens\": 1000 ... for multiple parameters.
+--     -- Recognized reasoning parameters, such as reasoning_effort, thinking, think, and chat_template_kwargs.enable_thinking, may affect whether AI Studio shows the reasoning icon for this provider.
 --     -- Please do not add the enclosing curly braces {} here. Also, no trailing comma is allowed.
 --     ["AdditionalJsonApiParameters"] = "",
 --

app/MindWork AI Studio/Provider/AdditionalApiParametersParser.cs

@@ -0,0 +1,96 @@
+using System.Text.Json;
+
+namespace AIStudio.Provider;
+
+/// <summary>
+/// Parses the provider-specific JSON fragment stored in <see cref="IProvider.AdditionalJsonApiParameters"/>.
+/// </summary>
+/// <remarks>
+/// The provider settings UI stores only the body of a JSON object, such as
+/// <c>"temperature": 0.5</c>. This parser wraps that fragment in curly braces,
+/// parses it as JSON, and converts it to regular CLR dictionaries, lists, and
+/// primitive values so request builders and feature detectors can inspect it.
+/// </remarks>
+public static class AdditionalApiParametersParser
+{
+    /// <summary>
+    /// Try to parse an additional-API-parameters JSON fragment into a dictionary.
+    /// </summary>
+    /// <param name="additionalJsonApiParameters">The JSON object body without the surrounding curly braces.</param>
+    /// <param name="parameters">The parsed parameters if parsing succeeds; otherwise an empty dictionary.</param>
+    /// <param name="errorMessage">The JSON parsing error message if parsing fails; otherwise <see langword="null"/>.</param>
+    /// <returns><see langword="true"/> if the fragment is empty or valid JSON; otherwise <see langword="false"/>.</returns>
+    public static bool TryParse(string additionalJsonApiParameters, out IDictionary<string, object> parameters, out string? errorMessage)
+    {
+        parameters = new Dictionary<string, object>();
+        errorMessage = null;
+        if (string.IsNullOrWhiteSpace(additionalJsonApiParameters))
+            return true;
+
+        try
+        {
+            // The UI stores only the object body, so wrap it before parsing.
+            using var jsonDoc = JsonDocument.Parse($"{{{additionalJsonApiParameters}}}");
+            parameters = ConvertToDictionary(jsonDoc.RootElement);
+            return true;
+        }
+        catch (JsonException ex)
+        {
+            errorMessage = ex.Message;
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Remove keys from a parsed parameter dictionary using case-insensitive matching.
+    /// </summary>
+    /// <param name="parameters">The parsed parameter dictionary to mutate.</param>
+    /// <param name="keysToRemove">The parameter names that should be removed.</param>
+    /// <returns>The same dictionary instance after the matching keys were removed.</returns>
+    public static IDictionary<string, object> RemoveKeys(IDictionary<string, object> parameters, IEnumerable<string> keysToRemove)
+    {
+        var removeSet = new HashSet<string>(keysToRemove, StringComparer.OrdinalIgnoreCase);
+        if (removeSet.Count is 0)
+            return parameters;
+
+        foreach (var key in parameters.Keys.ToList())
+            if (removeSet.Contains(key))
+                parameters.Remove(key);
+
+        return parameters;
+    }
+
+    /// <summary>
+    /// Convert a JSON object element into a dictionary of recursively converted CLR values.
+    /// </summary>
+    /// <param name="element">The JSON object element to convert.</param>
+    /// <returns>A dictionary containing all JSON object properties.</returns>
+    private static IDictionary<string, object> ConvertToDictionary(JsonElement element)
+    {
+        return element.EnumerateObject()
+            .ToDictionary<JsonProperty, string, object>(
+                p => p.Name,
+                p => ConvertJsonValue(p.Value) ?? string.Empty
+            );
+    }
+
+    /// <summary>
+    /// Convert a JSON value to the closest CLR representation used by provider request objects.
+    /// </summary>
+    /// <param name="element">The JSON element to convert.</param>
+    /// <returns>A string, number, boolean, dictionary, list, or empty string for unsupported/null values.</returns>
+    private static object? ConvertJsonValue(JsonElement element) => element.ValueKind switch
+    {
+        JsonValueKind.String => element.GetString(),
+        JsonValueKind.Number => element.TryGetInt32(out var i) ? i :
+            element.TryGetInt64(out var l) ? l :
+            element.TryGetDouble(out var d) ? d :
+            element.GetDecimal(),
+        JsonValueKind.True or JsonValueKind.False => element.GetBoolean(),
+        JsonValueKind.Null => string.Empty,
+        JsonValueKind.Object => ConvertToDictionary(element),
+        JsonValueKind.Array => element.EnumerateArray().Select(ConvertJsonValue).ToList(),
+
+        _ => string.Empty,
+    };
+}

app/MindWork AI Studio/Provider/BaseProvider.cs

@@ -1191,42 +1191,15 @@ public abstract class BaseProvider : IProvider, ISecretId
     protected IDictionary<string, object> ParseAdditionalApiParameters(
         params string[] keysToRemove)
     {
-        if(string.IsNullOrWhiteSpace(this.AdditionalJsonApiParameters))
+        if (!AdditionalApiParametersParser.TryParse(this.AdditionalJsonApiParameters, out var apiParameters, out var errorMessage))
-            return new Dictionary<string, object>();
-        
-        try
         {
-            // Wrap the user-provided parameters in curly brackets to form a valid JSON object:
+            this.logger.LogError("Failed to parse additional API parameters: {ExceptionMessage}", errorMessage);
-            var json = $"{{{this.AdditionalJsonApiParameters}}}";
-            var jsonDoc = JsonSerializer.Deserialize<JsonElement>(json, JSON_SERIALIZER_OPTIONS);
-            var dict = ConvertToDictionary(jsonDoc);
-
-            // Some keys are always removed because we set them:
-            var removeSet = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
-            if (keysToRemove.Length > 0)
-                removeSet.UnionWith(keysToRemove);
-            
-            removeSet.Add("stream");
-            removeSet.Add("model");
-            removeSet.Add("messages");
-
-            // Remove the specified keys (case-insensitive):
-            if (removeSet.Count > 0)
-            {
-                foreach (var key in dict.Keys.ToList())
-                {
-                    if (removeSet.Contains(key))
-                        dict.Remove(key);
-                }
-            }
-
-            return dict;
-        }
-        catch (JsonException ex)
-        {
-            this.logger.LogError("Failed to parse additional API parameters: {ExceptionMessage}", ex.Message);
             return new Dictionary<string, object>();
         }
+
+        // Some keys are always removed because AI Studio sets them itself.
+        var reservedKeys = keysToRemove.Concat(["stream", "model", "messages"]);
+        return AdditionalApiParametersParser.RemoveKeys(apiParameters, reservedKeys);
     }
     
     protected static bool TryPopIntParameter(IDictionary<string, object> parameters, string key, out int value)
@@ -1308,27 +1281,4 @@ public abstract class BaseProvider : IProvider, ISecretId
         return true;
     }
 
-    private static IDictionary<string, object> ConvertToDictionary(JsonElement element)
-    {
-        return element.EnumerateObject()
-            .ToDictionary<JsonProperty, string, object>(
-                p => p.Name,
-                p => ConvertJsonValue(p.Value) ?? string.Empty
-            );
-    }
-
-    private static object? ConvertJsonValue(JsonElement element) => element.ValueKind switch
-    {
-        JsonValueKind.String => element.GetString(),
-        JsonValueKind.Number => element.TryGetInt32(out var i) ? i :
-            element.TryGetInt64(out var l) ? l :
-            element.TryGetDouble(out var d) ? d :
-            element.GetDecimal(),
-        JsonValueKind.True or JsonValueKind.False => element.GetBoolean(),
-        JsonValueKind.Null => string.Empty,
-        JsonValueKind.Object => ConvertToDictionary(element),
-        JsonValueKind.Array => element.EnumerateArray().Select(ConvertJsonValue).ToList(),
-        
-        _ => string.Empty,
-    };
 }

app/MindWork AI Studio/Provider/Capability.cs

@@ -71,15 +71,20 @@ public enum Capability
     VIDEO_OUTPUT,
     
     /// <summary>
-    /// The AI model can perform reasoning tasks.
+    /// The AI model can perform reasoning tasks. You can enable reasoning optionally, but it is disabled by default.
     /// </summary>
     OPTIONAL_REASONING,
     
     /// <summary>
-    /// The AI model always performs reasoning.
+    /// The AI model always performs reasoning. There is no option to disable reasoning.
     /// </summary>
     ALWAYS_REASONING,
 
+    /// <summary>
+    /// The AI model performs optional reasoning, but it is enabled by default.
+    /// </summary>
+    REASONING_BY_DEFAULT,
+
     /// <summary>
     /// The AI model can embed information or data.
     /// </summary>

app/MindWork AI Studio/Provider/ReasoningIndicatorState.cs

@@ -0,0 +1,27 @@
+namespace AIStudio.Provider;
+
+/// <summary>
+/// Describes whether the provider selection should show the reasoning capability icon.
+/// </summary>
+public enum ReasoningIndicatorState
+{
+    /// <summary>
+    /// Do not show a reasoning indicator for the configured provider.
+    /// </summary>
+    NONE,
+
+    /// <summary>
+    /// Show that the selected model always performs reasoning.
+    /// </summary>
+    ALWAYS_ON,
+
+    /// <summary>
+    /// Show that reasoning is enabled by the provider or model default.
+    /// </summary>
+    DEFAULT_ON,
+
+    /// <summary>
+    /// Show that reasoning was explicitly enabled through the provider settings.
+    /// </summary>
+    CONFIGURED,
+}

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

@@ -10,6 +10,19 @@ public static partial class ProviderExtensions
 
         if (modelName.IndexOf("gemini-") is not -1)
         {
+            // Gemini 2.5 Flash Lite supports thinking, but the default is off:
+            if (modelName.IndexOf("gemini-2.5-flash-lite") is not -1)
+                return
+                [
+                    Capability.TEXT_INPUT, Capability.MULTIPLE_IMAGE_INPUT, Capability.AUDIO_INPUT,
+                    Capability.SPEECH_INPUT, Capability.VIDEO_INPUT,
+
+                    Capability.TEXT_OUTPUT,
+
+                    Capability.OPTIONAL_REASONING, Capability.FUNCTION_CALLING,
+                    Capability.CHAT_COMPLETION_API,
+                ];
+
             // Reasoning models:
             if (modelName.IndexOf("gemini-2.5") is not -1)
                 return

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

@@ -176,6 +176,17 @@ public static partial class ProviderExtensions
                 Capability.RESPONSES_API, Capability.CHAT_COMPLETION_API,
             ];
 
+        if(modelName is "gpt-5.5" || modelName.StartsWith("gpt-5.5-"))
+            return
+            [
+                Capability.TEXT_INPUT, Capability.MULTIPLE_IMAGE_INPUT,
+                Capability.TEXT_OUTPUT, Capability.IMAGE_OUTPUT,
+
+                Capability.FUNCTION_CALLING, Capability.OPTIONAL_REASONING, Capability.REASONING_BY_DEFAULT,
+                Capability.WEB_SEARCH,
+                Capability.RESPONSES_API, Capability.CHAT_COMPLETION_API,
+            ];
+        
         return
             [
                 Capability.TEXT_INPUT, Capability.MULTIPLE_IMAGE_INPUT,

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

@@ -0,0 +1,524 @@
+using AIStudio.Provider;
+
+using Host = AIStudio.Provider.SelfHosted.Host;
+
+namespace AIStudio.Settings;
+
+public static partial class ProviderExtensions
+{
+    /// <summary>
+    /// The reasoning-related intent found in the configured additional API parameters.
+    /// </summary>
+    private enum ReasoningConfigurationState
+    {
+        /// <summary>
+        /// No recognized reasoning parameter was found.
+        /// </summary>
+        NOT_CONFIGURED,
+
+        /// <summary>
+        /// A recognized reasoning parameter explicitly enables reasoning.
+        /// </summary>
+        EXPLICITLY_ENABLED,
+
+        /// <summary>
+        /// A recognized reasoning parameter explicitly disables reasoning.
+        /// </summary>
+        EXPLICITLY_DISABLED,
+    }
+
+    /// <summary>
+    /// Get the effective reasoning indicator state for the configured provider instance.
+    /// </summary>
+    /// <param name="provider">The configured provider.</param>
+    /// <returns>The effective reasoning indicator state.</returns>
+    /// <remarks>
+    /// This combines static model capabilities with per-provider additional API parameters.
+    /// For default-on models, an explicit disabling parameter hides the icon; for optional
+    /// models, an explicit enabling parameter is required before the icon is shown.
+    /// </remarks>
+    public static ReasoningIndicatorState GetReasoningIndicatorState(this Provider provider)
+    {
+        var capabilities = provider.GetModelCapabilities();
+        if (capabilities.Contains(Capability.ALWAYS_REASONING))
+            return ReasoningIndicatorState.ALWAYS_ON;
+        
+        var reasoningConfigurationState = GetReasoningConfigurationState(provider);
+        if (capabilities.Contains(Capability.REASONING_BY_DEFAULT) || UsesReasoningByDefault(provider, capabilities))
+        {
+            return reasoningConfigurationState switch
+            {
+                ReasoningConfigurationState.EXPLICITLY_DISABLED => ReasoningIndicatorState.NONE,
+                ReasoningConfigurationState.EXPLICITLY_ENABLED => ReasoningIndicatorState.CONFIGURED,
+                _ => ReasoningIndicatorState.DEFAULT_ON,
+            };
+        }
+
+        if (capabilities.Contains(Capability.OPTIONAL_REASONING) &&
+            reasoningConfigurationState is ReasoningConfigurationState.EXPLICITLY_ENABLED)
+            return ReasoningIndicatorState.CONFIGURED;
+
+        return ReasoningIndicatorState.NONE;
+    }
+
+    /// <summary>
+    /// Determine provider/host defaults that are not expressible by a model-name capability alone.
+    /// </summary>
+    /// <param name="provider">The configured provider instance.</param>
+    /// <param name="capabilities">The static capabilities detected for the selected model.</param>
+    /// <returns><see langword="true"/> if reasoning should be treated as enabled by default.</returns>
+    private static bool UsesReasoningByDefault(Provider provider, List<Capability> capabilities)
+    {
+        return provider is { UsedLLMProvider: LLMProviders.SELF_HOSTED, Host: Host.OLLAMA } &&
+               capabilities.Contains(Capability.OPTIONAL_REASONING);
+    }
+
+    /// <summary>
+    /// Parse additional API parameters and dispatch them to provider-specific reasoning detectors.
+    /// </summary>
+    /// <param name="provider">The configured provider whose additional API parameters should be inspected.</param>
+    /// <returns>The explicit reasoning configuration state, or <see cref="ReasoningConfigurationState.NOT_CONFIGURED"/> if nothing known was found.</returns>
+    private static ReasoningConfigurationState GetReasoningConfigurationState(Provider provider)
+    {
+        if (!AdditionalApiParametersParser.TryParse(provider.AdditionalJsonApiParameters, out var parameters, out _))
+            return ReasoningConfigurationState.NOT_CONFIGURED;
+
+        return provider.UsedLLMProvider switch
+        {
+            LLMProviders.OPEN_AI => MergeReasoningStates(
+                GetOpenAICompatibleReasoningState(parameters),
+                GetReasoningEffortState(parameters)),
+
+            LLMProviders.ANTHROPIC => GetAnthropicReasoningState(parameters),
+
+            LLMProviders.MISTRAL or LLMProviders.PERPLEXITY => GetReasoningEffortState(parameters),
+
+            LLMProviders.GOOGLE => MergeReasoningStates(
+                GetOpenAICompatibleReasoningState(parameters),
+                GetGoogleReasoningState(parameters)),
+
+            LLMProviders.ALIBABA_CLOUD => MergeReasoningStates(
+                GetOpenAICompatibleReasoningState(parameters),
+                GetQwenReasoningState(parameters)),
+
+            LLMProviders.OPEN_ROUTER or
+                LLMProviders.X or
+                LLMProviders.DEEP_SEEK or
+                LLMProviders.GROQ or
+                LLMProviders.FIREWORKS or
+                LLMProviders.HUGGINGFACE or
+                LLMProviders.HELMHOLTZ or
+                LLMProviders.GWDG => MergeReasoningStates(
+                    GetOpenAICompatibleReasoningState(parameters),
+                    GetReasoningEffortState(parameters),
+                    GetQwenReasoningState(parameters),
+                    GetGoogleReasoningState(parameters)),
+
+            LLMProviders.SELF_HOSTED => provider.Host switch
+            {
+                Host.OLLAMA => MergeReasoningStates(
+                    GetOpenAICompatibleReasoningState(parameters),
+                    GetOllamaReasoningState(parameters),
+                    GetQwenReasoningState(parameters)),
+
+                Host.LLAMA_CPP => MergeReasoningStates(
+                    GetOpenAICompatibleReasoningState(parameters),
+                    GetLlamaCppReasoningState(parameters),
+                    GetQwenReasoningState(parameters)),
+
+                Host.VLLM => MergeReasoningStates(
+                    GetOpenAICompatibleReasoningState(parameters),
+                    GetReasoningEffortState(parameters),
+                    GetVllmReasoningState(parameters),
+                    GetQwenReasoningState(parameters),
+                    GetGoogleReasoningState(parameters)),
+
+                _ => MergeReasoningStates(
+                    GetOpenAICompatibleReasoningState(parameters),
+                    GetReasoningEffortState(parameters),
+                    GetQwenReasoningState(parameters),
+                    GetGoogleReasoningState(parameters)),
+            },
+
+            _ => ReasoningConfigurationState.NOT_CONFIGURED,
+        };
+    }
+
+    /// <summary>
+    /// Detect OpenAI-compatible reasoning parameters.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <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.
+    /// </remarks>
+    private static ReasoningConfigurationState GetOpenAICompatibleReasoningState(IDictionary<string, object> parameters)
+    {
+        var reasoningState = ReasoningConfigurationState.NOT_CONFIGURED;
+        if (TryGetParameter(parameters, "reasoning", out var reasoning))
+        {
+            reasoningState = reasoning switch
+            {
+                IDictionary<string, object> reasoningObject when TryGetParameter(reasoningObject, "effort", out var effort) => GetLevelState(effort),
+                IDictionary<string, object> reasoningObject when TryGetParameter(reasoningObject, "summary", out var summary) => GetLevelState(summary),
+                IDictionary<string, object> => ReasoningConfigurationState.NOT_CONFIGURED,
+                _ => GetLevelState(reasoning),
+            };
+        }
+
+        return MergeReasoningStates(reasoningState, GetReasoningEffortState(parameters));
+    }
+
+    /// <summary>
+    /// Detect a top-level <c>reasoning_effort</c> parameter.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    private static ReasoningConfigurationState GetReasoningEffortState(IDictionary<string, object> parameters)
+    {
+        return TryGetParameter(parameters, "reasoning_effort", out var reasoningEffort)
+            ? GetLevelState(reasoningEffort)
+            : ReasoningConfigurationState.NOT_CONFIGURED;
+    }
+
+    /// <summary>
+    /// Detect Anthropic extended-thinking parameters.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    private static ReasoningConfigurationState GetAnthropicReasoningState(IDictionary<string, object> parameters)
+    {
+        if (!TryGetParameter(parameters, "thinking", out var thinking))
+            return ReasoningConfigurationState.NOT_CONFIGURED;
+
+        return thinking switch
+        {
+            IDictionary<string, object> thinkingObject when TryGetParameter(thinkingObject, "type", out var type) => GetAnthropicThinkingTypeState(type),
+            _ => GetLevelState(thinking),
+        };
+    }
+
+    /// <summary>
+    /// Detect Google Gemini thinking parameters across OpenAI-compatible additional parameters.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    /// <remarks>
+    /// Google can expose thinking options through <c>thinking_config</c>,
+    /// <c>generation_config.thinking_config</c>, <c>thinking_level</c>, and summary settings.
+    /// Summary settings only prove that thinking is enabled when they request summaries;
+    /// disabling summaries does not necessarily disable reasoning.
+    /// </remarks>
+    private static ReasoningConfigurationState GetGoogleReasoningState(IDictionary<string, object> parameters)
+    {
+        var states = new List<ReasoningConfigurationState>();
+
+        if (TryGetParameter(parameters, "thinking_config", out var thinkingConfig) &&
+            thinkingConfig is IDictionary<string, object> thinkingConfigObject)
+            states.Add(GetGoogleThinkingConfigState(thinkingConfigObject));
+
+        if (TryGetParameter(parameters, "generation_config", out var generationConfig) &&
+            generationConfig is IDictionary<string, object> generationConfigObject)
+        {
+            if (TryGetParameter(generationConfigObject, "thinking_config", out var nestedThinkingConfig) &&
+                nestedThinkingConfig is IDictionary<string, object> nestedThinkingConfigObject)
+                states.Add(GetGoogleThinkingConfigState(nestedThinkingConfigObject));
+
+            if (TryGetParameter(generationConfigObject, "thinking_summaries", out var thinkingSummaries))
+                states.Add(GetThinkingSummariesState(thinkingSummaries));
+
+            if (TryGetParameter(generationConfigObject, "thinking_level", out var thinkingLevel))
+                states.Add(GetLevelState(thinkingLevel));
+        }
+
+        if (TryGetParameter(parameters, "thinking_summaries", out var topLevelThinkingSummaries))
+            states.Add(GetThinkingSummariesState(topLevelThinkingSummaries));
+
+        if (TryGetParameter(parameters, "thinking_level", out var topLevelThinkingLevel))
+            states.Add(GetLevelState(topLevelThinkingLevel));
+
+        return MergeReasoningStates(states);
+    }
+
+    /// <summary>
+    /// Detect Google Gemini thinking-budget and include-thoughts settings.
+    /// </summary>
+    /// <param name="thinkingConfig">The parsed <c>thinking_config</c> object.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    private static ReasoningConfigurationState GetGoogleThinkingConfigState(IDictionary<string, object> thinkingConfig)
+    {
+        var states = new List<ReasoningConfigurationState>();
+
+        if (TryGetParameter(thinkingConfig, "thinking_budget", out var thinkingBudget) ||
+            TryGetParameter(thinkingConfig, "thinkingBudget", out thinkingBudget))
+            states.Add(GetBudgetState(thinkingBudget));
+
+        if (TryGetParameter(thinkingConfig, "include_thoughts", out var includeThoughts) ||
+            TryGetParameter(thinkingConfig, "includeThoughts", out includeThoughts))
+            states.Add(GetLevelState(includeThoughts));
+
+        return MergeReasoningStates(states);
+    }
+
+    /// <summary>
+    /// Detect Google Gemini thinking-summary values that imply reasoning is active.
+    /// </summary>
+    /// <param name="value">The configured thinking-summary value.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    /// <remarks>
+    /// A disabled or missing summary does not prove that thinking is disabled, so only
+    /// known enabling values are treated as explicit reasoning configuration.
+    /// </remarks>
+    private static ReasoningConfigurationState GetThinkingSummariesState(object? value) => value switch
+    {
+        string text when text.Equals("auto", StringComparison.OrdinalIgnoreCase) ||
+        text.Equals("on", StringComparison.OrdinalIgnoreCase) ||
+        text.Equals("summarized", StringComparison.OrdinalIgnoreCase) => ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        true => ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        _ => ReasoningConfigurationState.NOT_CONFIGURED,
+    };
+
+    /// <summary>
+    /// Detect Ollama's <c>think</c> parameter.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    private static ReasoningConfigurationState GetOllamaReasoningState(IDictionary<string, object> parameters)
+    {
+        return TryGetParameter(parameters, "think", out var think)
+            ? GetLevelState(think)
+            : ReasoningConfigurationState.NOT_CONFIGURED;
+    }
+
+    /// <summary>
+    /// Detect llama.cpp server reasoning parameters.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    /// <remarks>
+    /// llama.cpp exposes runtime reasoning control through parameters such as
+    /// <c>reasoning</c>, <c>reasoning_budget</c>, and template-specific kwargs.
+    /// </remarks>
+    private static ReasoningConfigurationState GetLlamaCppReasoningState(IDictionary<string, object> parameters)
+    {
+        var states = new List<ReasoningConfigurationState>();
+
+        if (TryGetParameter(parameters, "reasoning", out var reasoning))
+            states.Add(GetLlamaCppReasoningModeState(reasoning));
+
+        if (TryGetParameter(parameters, "reasoning_budget", out var reasoningBudget))
+            states.Add(GetBudgetState(reasoningBudget));
+
+        if (TryGetParameter(parameters, "chat_template_kwargs", out var chatTemplateKwargs) &&
+            chatTemplateKwargs is IDictionary<string, object> chatTemplateKwargsObject)
+            states.Add(GetQwenReasoningState(chatTemplateKwargsObject));
+
+        return MergeReasoningStates(states);
+    }
+
+    /// <summary>
+    /// Detect vLLM reasoning parameters.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    /// <remarks>
+    /// vLLM supports both top-level reasoning fields and chat-template kwargs, depending
+    /// on model family and reasoning parser configuration.
+    /// </remarks>
+    private static ReasoningConfigurationState GetVllmReasoningState(IDictionary<string, object> parameters)
+    {
+        var states = new List<ReasoningConfigurationState>();
+
+        if (TryGetParameter(parameters, "thinking_token_budget", out var thinkingTokenBudget))
+            states.Add(GetBudgetState(thinkingTokenBudget));
+
+        if (TryGetParameter(parameters, "chat_template_kwargs", out var chatTemplateKwargs) &&
+            chatTemplateKwargs is IDictionary<string, object> chatTemplateKwargsObject)
+        {
+            states.Add(GetQwenReasoningState(chatTemplateKwargsObject));
+
+            if (TryGetParameter(chatTemplateKwargsObject, "thinking", out var thinking))
+                states.Add(GetLevelState(thinking));
+        }
+
+        return MergeReasoningStates(states);
+    }
+
+    /// <summary>
+    /// Detect Qwen-style <c>enable_thinking</c> parameters.
+    /// </summary>
+    /// <param name="parameters">The parsed additional API parameters.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    /// <remarks>
+    /// Some OpenAI-compatible servers accept <c>enable_thinking</c> either at the
+    /// top level or under <c>chat_template_kwargs</c>.
+    /// </remarks>
+    private static ReasoningConfigurationState GetQwenReasoningState(IDictionary<string, object> parameters)
+    {
+        var states = new List<ReasoningConfigurationState>();
+
+        if (TryGetParameter(parameters, "enable_thinking", out var enableThinking))
+            states.Add(GetLevelState(enableThinking));
+
+        if (TryGetParameter(parameters, "chat_template_kwargs", out var chatTemplateKwargs) &&
+            chatTemplateKwargs is IDictionary<string, object> chatTemplateKwargsObject &&
+            TryGetParameter(chatTemplateKwargsObject, "enable_thinking", out var nestedEnableThinking))
+            states.Add(GetLevelState(nestedEnableThinking));
+
+        return MergeReasoningStates(states);
+    }
+
+    /// <summary>
+    /// Interpret Anthropic's <c>thinking.type</c> value.
+    /// </summary>
+    /// <param name="value">The configured Anthropic thinking type.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    private static ReasoningConfigurationState GetAnthropicThinkingTypeState(object? value) => value switch
+    {
+        string text when text.Equals("enabled", StringComparison.OrdinalIgnoreCase) ||
+        text.Equals("adaptive", StringComparison.OrdinalIgnoreCase) => ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        string text when IsDisabledText(text) => ReasoningConfigurationState.EXPLICITLY_DISABLED,
+        _ => GetLevelState(value),
+    };
+
+    /// <summary>
+    /// Interpret llama.cpp's <c>reasoning</c> mode value.
+    /// </summary>
+    /// <param name="value">The configured llama.cpp reasoning mode.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    /// <remarks>
+    /// <c>auto</c> means the server decides from the model/template, so it is treated as
+    /// not configured by the user rather than as explicitly enabled.
+    /// </remarks>
+    private static ReasoningConfigurationState GetLlamaCppReasoningModeState(object? value) => value switch
+    {
+        string text when text.Equals("on", StringComparison.OrdinalIgnoreCase) => ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        string text when text.Equals("off", StringComparison.OrdinalIgnoreCase) => ReasoningConfigurationState.EXPLICITLY_DISABLED,
+        string text when text.Equals("auto", StringComparison.OrdinalIgnoreCase) => ReasoningConfigurationState.NOT_CONFIGURED,
+        _ => GetLevelState(value),
+    };
+
+    /// <summary>
+    /// Interpret token-budget style values used by several providers.
+    /// </summary>
+    /// <param name="value">The configured budget value.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    /// <remarks>
+    /// A zero budget disables reasoning; non-zero values, including unrestricted negative
+    /// budgets, indicate that reasoning is available for the request.
+    /// </remarks>
+    private static ReasoningConfigurationState GetBudgetState(object? value) => value switch
+    {
+        int i => i is 0 ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        long l => l is 0 ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        double d => Math.Abs(d) < double.Epsilon ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        decimal m => m is 0 ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        _ => GetLevelState(value),
+    };
+
+    /// <summary>
+    /// Interpret common boolean, numeric, and level-style reasoning values.
+    /// </summary>
+    /// <param name="value">The raw parsed parameter value.</param>
+    /// <returns>The detected reasoning configuration state.</returns>
+    private static ReasoningConfigurationState GetLevelState(object? value) => value switch
+    {
+        bool booleanValue => booleanValue ? ReasoningConfigurationState.EXPLICITLY_ENABLED : ReasoningConfigurationState.EXPLICITLY_DISABLED,
+        int i => i is 0 ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        long l => l is 0 ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        double d => Math.Abs(d) < double.Epsilon ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        decimal m => m is 0 ? ReasoningConfigurationState.EXPLICITLY_DISABLED : ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        string text when IsDisabledText(text) => ReasoningConfigurationState.EXPLICITLY_DISABLED,
+        string text when IsEnabledText(text) => ReasoningConfigurationState.EXPLICITLY_ENABLED,
+        _ => ReasoningConfigurationState.NOT_CONFIGURED,
+    };
+
+    /// <summary>
+    /// Determine whether a string value is a known reasoning-enabling value.
+    /// </summary>
+    /// <param name="text">The string value to inspect.</param>
+    /// <returns><see langword="true"/> if the value should be treated as enabling reasoning.</returns>
+    private static bool IsEnabledText(string text)
+    {
+        return text.Equals("true", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("yes", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("on", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("enabled", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("low", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("minimal", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("medium", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("high", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("max", StringComparison.OrdinalIgnoreCase);
+    }
+
+    /// <summary>
+    /// Determine whether a string value is a known reasoning-disabling value.
+    /// </summary>
+    /// <param name="text">The string value to inspect.</param>
+    /// <returns><see langword="true"/> if the value should be treated as disabling reasoning.</returns>
+    private static bool IsDisabledText(string text)
+    {
+        return string.IsNullOrWhiteSpace(text) ||
+               text.Equals("false", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("no", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("off", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("none", StringComparison.OrdinalIgnoreCase) ||
+               text.Equals("disabled", StringComparison.OrdinalIgnoreCase);
+    }
+
+    /// <summary>
+    /// Merge multiple detected reasoning states into a single state.
+    /// </summary>
+    /// <param name="states">The detected states from provider-specific parameter checks.</param>
+    /// <returns>The merged state.</returns>
+    /// <remarks>
+    /// Explicit disabling wins over enabling because user-provided off switches should
+    /// suppress default-on reasoning indicators.
+    /// </remarks>
+    private static ReasoningConfigurationState MergeReasoningStates(IEnumerable<ReasoningConfigurationState> states)
+    {
+        var result = ReasoningConfigurationState.NOT_CONFIGURED;
+        foreach (var state in states)
+        {
+            if (state is ReasoningConfigurationState.EXPLICITLY_DISABLED)
+                return ReasoningConfigurationState.EXPLICITLY_DISABLED;
+
+            if (state is ReasoningConfigurationState.EXPLICITLY_ENABLED)
+                result = ReasoningConfigurationState.EXPLICITLY_ENABLED;
+        }
+
+        return result;
+    }
+
+    /// <summary>
+    /// Merge multiple detected reasoning states into a single state.
+    /// </summary>
+    /// <param name="states">The detected states from provider-specific parameter checks.</param>
+    /// <returns>The merged state.</returns>
+    private static ReasoningConfigurationState MergeReasoningStates(params ReasoningConfigurationState[] states)
+    {
+        return MergeReasoningStates(states.AsEnumerable());
+    }
+
+    /// <summary>
+    /// Try to read a parameter from a dictionary using case-insensitive key matching.
+    /// </summary>
+    /// <param name="parameters">The parsed parameter dictionary.</param>
+    /// <param name="key">The parameter name to find.</param>
+    /// <param name="value">The matched parameter value, if found.</param>
+    /// <returns><see langword="true"/> if a matching key was found; otherwise <see langword="false"/>.</returns>
+    private static bool TryGetParameter(IDictionary<string, object> parameters, string key, out object? value)
+    {
+        value = null;
+        if (parameters.Count is 0)
+            return false;
+
+        var foundKey = parameters.Keys.FirstOrDefault(k => string.Equals(k, key, StringComparison.OrdinalIgnoreCase));
+        if (foundKey is null)
+            return false;
+
+        value = parameters[foundKey];
+        return true;
+    }
+}