diff --git a/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs b/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs
index 8958ecca..8e810683 100644
--- a/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs
+++ b/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs
@@ -21,13 +21,13 @@ public class PlotChartFn : IFunctionCallback
 
     public async Task<bool> Execute(RoleDialogModel message)
     {
-        var db = _services.GetRequiredService<IBotSharpRepository>();
         var agentService = _services.GetRequiredService<IAgentService>();
         var convService = _services.GetRequiredService<IConversationService>();
 
         var args = JsonSerializer.Deserialize<LlmContextIn>(message.FunctionArgs);
+
         var agent = await agentService.GetAgent(message.CurrentAgentId);
-        var inst = db.GetAgentTemplate(BuiltInAgentId.UtilityAssistant, "util-chart-plot_instruction");
+        var inst = GetChartPlotInstruction(message.CurrentAgentId);
         var innerAgent = new Agent
         {
             Id = agent.Id,
@@ -84,6 +84,27 @@ public class PlotChartFn : IFunctionCallback
         }
     }
 
+    private string GetChartPlotInstruction(string agentId)
+    {
+        var db = _services.GetRequiredService<IBotSharpRepository>();
+        var state = _services.GetRequiredService<IConversationStateService>();
+
+        var templateContent = string.Empty;
+        var templateName = state.GetState("chart_plot_template");
+
+        if (!string.IsNullOrEmpty(templateName))
+        {
+            templateContent = db.GetAgentTemplate(agentId, templateName);
+        }
+        else
+        {
+            templateName = "util-chart-plot_instruction";
+            templateContent = db.GetAgentTemplate(BuiltInAgentId.UtilityAssistant, templateName);
+        }
+
+        return templateContent;
+    }
+
     private (string, string) GetLlmProviderModel()
     {
         var provider = "openai";
diff --git a/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadImageFn.cs b/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadImageFn.cs
index f8a0f593..2e30929e 100644
--- a/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadImageFn.cs
+++ b/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadImageFn.cs
@@ -98,10 +98,9 @@ public class ReadImageFn : IFunctionCallback
     {
         try
         {
-            var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
-            var provider = llmProviderService.GetProviders().FirstOrDefault(x => x == "openai");
-            var model = llmProviderService.GetProviderModel(provider: provider, id: "gpt-4o", multiModal: true);
-            var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model.Name);
+            var provider = "openai";
+            var model = "gpt-5-mini";
+            var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model);
             var response = await completion.GetChatCompletions(agent, dialogs);
             return response.Content;
         }
diff --git a/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadPdfFn.cs b/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadPdfFn.cs
index ab8ab8a9..7436fce5 100644
--- a/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadPdfFn.cs
+++ b/src/Plugins/BotSharp.Plugin.FileHandler/Functions/ReadPdfFn.cs
@@ -89,10 +89,9 @@ public class ReadPdfFn : IFunctionCallback
     {
         try
         {
-            var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
-            var provider = llmProviderService.GetProviders().FirstOrDefault(x => x == "openai");
-            var model = llmProviderService.GetProviderModel(provider: provider, id: "gpt-4o", multiModal: true);
-            var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model.Name);
+            var provider = "openai";
+            var model = "gpt-5-mini";
+            var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model);
             var response = await completion.GetChatCompletions(agent, dialogs);
             return response.Content;
         }
diff --git a/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs b/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs
index cd14e375..2ffbdb53 100644
--- a/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs
+++ b/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs
@@ -230,8 +230,13 @@ public class QdrantDb : IVectorDb
         {
             foreach (var item in payload)
             {
+                if (item.Value == null || item.Key.IsEqualTo(KnowledgePayloadName.Text))
+                {
+                    continue;
+                }
+
                 var value = item.Value.DataValue?.ConvertToString();
-                if (value == null || item.Key.IsEqualTo(KnowledgePayloadName.Text))
+                if (string.IsNullOrEmpty(value))
                 {
                     continue;
                 }