diff --git a/src/Infrastructure/BotSharp.Abstraction/Functions/Models/FunctionDef.cs b/src/Infrastructure/BotSharp.Abstraction/Functions/Models/FunctionDef.cs
index e2a56817..bd71009b 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Functions/Models/FunctionDef.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Functions/Models/FunctionDef.cs
@@ -25,6 +25,10 @@ public class FunctionDef
     [JsonPropertyName("parameters")]
     public FunctionParametersDef Parameters { get; set; } = new FunctionParametersDef();
 
+    [JsonPropertyName("output")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? Output { get; set; }
+
     public override string ToString()
     {
         return $"{Name}: {Description}";
diff --git a/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeAgent.cs b/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeAgent.cs
index bec44bc4..7bfd9352 100644
--- a/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeAgent.cs
+++ b/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeAgent.cs
@@ -101,8 +101,8 @@ public partial class RoutingService
                 Context.SetDialogs(dialogs);
 
                 // Send to Next LLM
-                var agentId = routing.Context.GetCurrentAgentId();
-                await InvokeAgent(agentId, dialogs);
+                var curAgentId = routing.Context.GetCurrentAgentId();
+                await InvokeAgent(curAgentId, dialogs);
             }
         }
         else
diff --git a/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeFunction.cs b/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeFunction.cs
index fb074dfc..aaa81694 100644
--- a/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeFunction.cs
+++ b/src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeFunction.cs
@@ -1,4 +1,7 @@
 using BotSharp.Abstraction.Functions;
+using BotSharp.Abstraction.Options;
+using BotSharp.Abstraction.Templating;
+
 namespace BotSharp.Core.Routing;
 
 public partial class RoutingService
@@ -8,6 +11,12 @@ public partial class RoutingService
         var function = _services.GetServices<IFunctionCallback>().FirstOrDefault(x => x.Name == name);
         if (function == null)
         {
+            var executed = await InvokeDummyFunction(name, message);
+            if (executed)
+            {
+                return true;
+            }
+
             message.StopCompletion = true;
             message.Content = $"Can't find function implementation of {name}.";
             _logger.LogError(message.Content);
@@ -87,4 +96,54 @@ public partial class RoutingService
 
         return result;
     }
+
+    private async Task<bool> InvokeDummyFunction(string functionName, RoleDialogModel message)
+    {
+        if (string.IsNullOrEmpty(message.CurrentAgentId))
+        {
+            return false;
+        }
+
+        var agentService = _services.GetRequiredService<IAgentService>();
+        var agent = await agentService.GetAgent(message.CurrentAgentId);
+        var found = agent?.Functions?.FirstOrDefault(x => x.Name == functionName);
+        if (string.IsNullOrWhiteSpace(found?.Output))
+        {
+            return false;
+        }
+
+        var clonedMessage = RoleDialogModel.From(message);
+        clonedMessage.FunctionName = functionName;
+        clonedMessage.Indication = "Running";
+
+        var hooks = _services
+            .GetRequiredService<ConversationHookProvider>()
+            .HooksOrderByPriority;
+
+        foreach (var hook in hooks)
+        {
+            await hook.OnFunctionExecuting(clonedMessage);
+        }
+
+        var render = _services.GetRequiredService<ITemplateRender>();
+        var state = _services.GetRequiredService<IConversationStateService>();
+        var options = _services.GetRequiredService<BotSharpOptions>();
+
+        var dict = new Dictionary<string, object>();
+        foreach (var item in state.GetStates())
+        {
+            dict[item.Key] = item.Value;
+        }
+
+        var text = render.Render(found.Output, dict);
+        message.Content = text;
+        clonedMessage.Content = text;
+
+        foreach (var hook in hooks)
+        {
+            await hook.OnFunctionExecuted(clonedMessage);
+        }
+
+        return true;
+    }
 }
diff --git a/src/Plugins/BotSharp.Plugin.MongoStorage/Models/FunctionDefMongoElement.cs b/src/Plugins/BotSharp.Plugin.MongoStorage/Models/FunctionDefMongoElement.cs
index f274eb0c..8ad69be5 100644
--- a/src/Plugins/BotSharp.Plugin.MongoStorage/Models/FunctionDefMongoElement.cs
+++ b/src/Plugins/BotSharp.Plugin.MongoStorage/Models/FunctionDefMongoElement.cs
@@ -12,6 +12,7 @@ public class FunctionDefMongoElement
     public string? VisibilityExpression { get; set; }
     public string? Impact { get; set; }
     public FunctionParametersDefMongoElement Parameters { get; set; } = new();
+    public string? Output { get; set; }
 
     public static FunctionDefMongoElement ToMongoElement(FunctionDef function)
     {
@@ -27,7 +28,8 @@ public class FunctionDefMongoElement
                 Type = function.Parameters.Type,
                 Properties = JsonSerializer.Serialize(function.Parameters.Properties),
                 Required = function.Parameters.Required,
-            }
+            },
+            Output = function.Output
         };
     }
 
@@ -45,7 +47,8 @@ public class FunctionDefMongoElement
                 Type = function.Parameters.Type,
                 Properties = JsonSerializer.Deserialize<JsonDocument>(function.Parameters.Properties.IfNullOrEmptyAs("{}")),
                 Required = function.Parameters.Required,
-            }
+            },
+            Output = function.Output
         };
     }
 }