minor change

src/Infrastructure/BotSharp.Abstraction/Agents/Models/Agent.cs

@@ -100,6 +100,7 @@ public class Agent
             AllowRouting = agent.AllowRouting,
             Profiles = agent.Profiles,
             RoutingRules = agent.RoutingRules,
+            LlmConfig = agent.LlmConfig,
             CreatedDateTime = agent.CreatedDateTime,
             UpdatedDateTime = agent.UpdatedDateTime,
         };

src/Infrastructure/BotSharp.Abstraction/Agents/Models/AgentLlmConfig.cs

@@ -6,11 +6,13 @@ public class AgentLlmConfig
     /// Completion Provider
     /// </summary>
     [JsonPropertyName("provider")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public string? Provider { get; set; }
 
     /// <summary>
     /// Model name
     /// </summary>
     [JsonPropertyName("model")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public string? Model { get; set; }
 }

src/Plugins/BotSharp.Plugin.MongoStorage/Models/AgentLlmConfigMongoElement.cs

@@ -5,7 +5,7 @@ namespace BotSharp.Plugin.MongoStorage.Models;
 public class AgentLlmConfigMongoElement
 {
     public string? Provider { get; set; }
-    public string Model { get; set; }
+    public string? Model { get; set; }
 
     public static AgentLlmConfigMongoElement? ToMongoElement(AgentLlmConfig? config)
     {