last ...

Configurations/XAiApiConfiguration.cs

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+using xAiModels.Models;
+
+namespace xAiModels.Configurations
+{
+    public class XAiApiConfiguration
+    {
+        /// <summary>
+        /// Model Providers ...
+        /// </summary>
+        public XAiModelDescriptor[] Models { get; set; } = [];
+    }
+}

Constants/ConfigurationNodeNames.cs

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+namespace xAiModels.Constants
+{
+    public partial struct ConfigurationNodeNames
+    {
+        public const string AI_API_NODE = "AiApiConfiguration";
+    }
+}

Constants/XAiModelProviderType.cs

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+namespace xAiModels.Constants
+{
+    /// <summary>
+    /// Specifiy Provider Type ...
+    /// </summary>
+    public enum XAiModelProviderType
+    {
+        None,
+        Ollama,
+        DeepSeek,
+        HuggingFace        
+    }
+}

Extensions/ChatResponseExtensions.cs

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+using Microsoft.Extensions.AI;
+using xCommons.Extensions;
+
+namespace xAiModels.Extensions
+{
+    public static class ChatResponseExtensions
+    {
+        /// <summary>
+        /// Validate a Chat Response ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValid(this ChatResponse source)
+        {
+            //
+            var result =
+                source is not null &&
+                !source.IsNullOrDefault() &&
+                !string.IsNullOrWhiteSpace(source.Text) &&
+                source.FinishReason == ChatFinishReason.Stop;
+
+            //
+            return result;
+        }
+    }
+}

Extensions/XAiApiConfigurationExtensions.cs

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+using System.Linq;
+using xAiModels.Configurations;
+using xAiModels.Models;
+using xCommons.Extensions;
+
+namespace xAiModels.Extensions
+{
+    public static class XAiApiConfigurationExtensions
+    {
+        /// <summary>
+        /// Validate Api Configuration ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValid(this XAiApiConfiguration source)
+        {
+            return
+                !source.IsNullOrDefault() &&
+                source.Models.HasChild();
+        }
+
+        /// <summary>
+        /// Retrieve Default Model Descriptor ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static XAiModelDescriptor GetDefaultModel(this XAiApiConfiguration source)
+        {
+            //
+            XAiModelDescriptor result = null;
+
+            //
+            if (source.IsValid())
+            {
+                result = source.Models.First();
+            }
+
+            //
+            return result;
+        }
+    }
+}

Models/XAiModelDescriptor.cs

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+using xAiModels.Constants;
+
+namespace xAiModels.Models
+{
+    /// <summary>
+    /// Describe a Provided Model ...
+    /// </summary>
+    public class XAiModelDescriptor
+    {
+        /// <summary>
+        /// Provider Name ...
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// LLM Provider Url ...
+        /// </summary>
+        public string Url { get; set; }
+
+        /// <summary>
+        /// Model Name ...
+        /// </summary>
+        public string LLM { get; set; }
+
+        /// <summary>
+        /// Api Key for Connection ...
+        /// </summary>
+        public string ApiKey { get; set; }
+
+        /// <summary>
+        /// Specified Model Provider Type ...
+        /// </summary>
+        public XAiModelProviderType Provider { get; set; } = XAiModelProviderType.Ollama;        
+    }
+}