last ...

Configurations/XAiApiConfiguration.cs

@@ -8,5 +8,10 @@ namespace xAiApi.Configurations
         /// Allowed Models to Use ...
         /// </summary>
         public XAiModelDescriptor[] Models { get; set; } = [];
+
+        /// <summary>
+        /// Allowed Prompts to Use ...
+        /// </summary>
+        public XAiPromptDescriptor[] Prompts { get; set; } = [];
     }
 }

Constants/XAiApiConstants.cs

@@ -6,5 +6,8 @@ namespace xAiApi.Constants
         // Database Descriptor ...
         public const string XAiApiDbIdentifier = "xAiApiDb";
         public const string XAiApiMigrationsAssemblyIdentifier = "xAiApi";
+
+        //
+        public const string XAiApiIntroductionPromptName = "Introduction";
     }
 }

Extensions/XModelsExtensions.cs

@@ -1,5 +1,7 @@
+using System.Collections.Generic;
 using System.Linq;
 using xAiApi.Configurations;
+using xAiApi.Constants;
 using xAiApi.Models;
 using xCommons.Extensions;
 
@@ -38,7 +40,58 @@ namespace xAiApi.Extensions
             var result =
                 !source.IsNullOrDefault() &&
                 source.Models.HasChild() &&
-                source.Models.All(m => m.IsValid());
+                source.Models.All(m => m.IsValid()) &&
+                source.Prompts.All(m => m.IsValid()) &&
+                source.Prompts.Any(p => p.Name
+                    .Equals(
+                        XAiApiConstants.XAiApiIntroductionPromptName,
+                        System.StringComparison.InvariantCultureIgnoreCase));
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate Specified Param ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValid(this XAiPromptParam source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.Name.IsNullOrEmpty() &&
+                !source.Param.IsNullOrEmpty();
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate Specified Prompt ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValid(this XAiPromptDescriptor source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.Name.IsNullOrEmpty() &&
+                !source.Template.IsNullOrEmpty();
+            if (!result)
+            {
+                return result;
+            }
+
+            //
+            if (source.Params.HasChild())
+            {
+                result =
+                    result &&
+                    source.Params.All(x => x.IsValid());
+            }
 
             //
             return result;
@@ -97,5 +150,96 @@ namespace xAiApi.Extensions
             //
             return result;
         }
+
+        /// <summary>
+        /// Retrieve Introduction Prompt ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static XAiPromptDescriptor GetIntroductionPrompt(this XAiApiConfiguration source)
+        {
+            //
+            XAiPromptDescriptor result = null;
+
+            //
+            if (source.IsValid())
+            {
+                //
+                result = source.Prompts
+                    .FirstOrDefault(p => p.Name
+                        .Equals(
+                            XAiApiConstants.XAiApiIntroductionPromptName,
+                            System.StringComparison.InvariantCultureIgnoreCase));
+            }
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Select Specified Prompts and Parse it's Template
+        /// and Generate Message ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <param name="name"></param>
+        /// <param name="params"></param>
+        /// <returns></returns>
+        public static string GetPrompt(
+            this XAiApiConfiguration source,
+            string name,
+            IDictionary<string, string> @params = null
+        )
+        {
+            //
+            var result = string.Empty;
+
+            //
+            // Normalize ...
+            if (name.IsNullOrEmpty())
+            {
+                name = XAiApiConstants.XAiApiIntroductionPromptName;
+            }
+
+            //
+            if (source.IsValid())
+            {
+                //
+                var prompt = source.Prompts
+                    .FirstOrDefault(p => p.Name
+                        .Equals(
+                            name,
+                            System.StringComparison.InvariantCultureIgnoreCase
+                        )
+                    );
+                if (!prompt.IsNullOrDefault())
+                {
+                    //
+                    result = prompt.Template;
+
+                    //
+                    // Handle Params ...
+                    if (!@params.IsNullOrDefault() && @params.HasChild())
+                    {
+                        //
+                        // Select Params ...
+                        var existsParams = prompt.Params
+                            .Where(p => @params.Any(pr => pr.Key == p.Name))
+                            .Distinct()
+                            .ToList();
+
+                        //
+                        // Replace Selected Params ...
+                        existsParams
+                            .ForEach(pk =>
+                            {
+                                result = result.Replace(pk.Param, @params[pk.Name]);
+                            });
+                    }
+                }
+            }
+
+            //
+            return result;
+        }
     }
 }

Models/XAiPromptDescriptor.cs

@@ -0,0 +1,49 @@
+namespace xAiApi.Models
+{
+    /// <summary>
+    /// Describe Specified Prompt ...
+    /// </summary>
+    public class XAiPromptDescriptor
+    {
+        /// <summary>
+        /// Prompt Name ...
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Prompt Template ... 
+        /// </summary>
+        public string Template { get; set; }
+
+        /// <summary>
+        /// Prompt Description ...
+        /// </summary>
+        public string Description { get; set; }
+
+        /// <summary>
+        /// Prompt Template Params ...
+        /// </summary>
+        public XAiPromptParam[] Params { get; set; } = [];
+    }
+
+    /// <summary>
+    /// Specified a Prompt Param ...
+    /// </summary>
+    public class XAiPromptParam
+    {
+        /// <summary>
+        /// Param Name ...
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Param Identifier ...
+        /// </summary>
+        public string Param { get; set; }
+
+        /// <summary>
+        /// Parma Description ...
+        /// </summary>
+        public string Description { get; set; }
+    }
+}