1. refine chart handler instruction

2. add mechanism to allow sending multiple messages in a single round

src/Infrastructure/BotSharp.Abstraction/Conversations/Dtos/ChatResponseDto.cs

@@ -42,6 +42,9 @@ public class ChatResponseDto : InstructResult
     [JsonPropertyName("is_streaming")]
     public bool IsStreaming { get; set; }
 
+    [JsonPropertyName("is_append")]
+    public bool IsAppend { get; set; }
+
     [JsonPropertyName("created_at")]
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
 }

src/Infrastructure/BotSharp.Abstraction/Conversations/Models/RoleDialogModel.cs

@@ -127,6 +127,13 @@ public class RoleDialogModel : ITrackableMessage
     [JsonIgnore(Condition = JsonIgnoreCondition.Always)]
     public bool IsStreaming { get; set; }
 
+    /// <summary>
+    /// Additional messages that can be sent sequentially and save to db
+    /// </summary>
+    [JsonIgnore(Condition = JsonIgnoreCondition.Always)]
+    public ChatMessageWrapper? AdditionalMessageWrapper { get; set; }
+
+
     public RoleDialogModel()
     {
     }
@@ -171,7 +178,15 @@ public class RoleDialogModel : ITrackableMessage
             Instruction = source.Instruction,
             Data = source.Data,
             IsStreaming = source.IsStreaming,
-            Annotations = source.Annotations
+            Annotations = source.Annotations,
+            AdditionalMessageWrapper = source.AdditionalMessageWrapper
         };
     }
 }
+
+public class ChatMessageWrapper
+{
+    public int IntervalMilliSeconds { get; set; } = 1000;
+    public bool SaveToDb { get; set; }
+    public List<RoleDialogModel>? Messages { get; set; }
+}

src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.SendMessage.cs

@@ -1,4 +1,3 @@
-using BotSharp.Abstraction.Hooks;
 using BotSharp.Abstraction.Infrastructures.Enums;
 using BotSharp.Abstraction.Messaging;
 using BotSharp.Abstraction.Messaging.Models.RichContent;

src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationStorage.cs

@@ -1,3 +1,4 @@
+using BotSharp.Abstraction.Conversations.Models;
 using BotSharp.Abstraction.Messaging;
 using BotSharp.Abstraction.Messaging.Models.RichContent;
 using BotSharp.Abstraction.Options;
@@ -31,63 +32,21 @@ public class ConversationStorage : IConversationStorage
 
         foreach ( var dialog in dialogs)
         {
-            if (dialog.Role == AgentRole.Function)
+            var innerList = new List<RoleDialogModel> { dialog };
+            if (dialog.AdditionalMessageWrapper != null
+                && dialog.AdditionalMessageWrapper.SaveToDb
+                && dialog.AdditionalMessageWrapper.Messages?.Count > 0)
             {
-                var meta = new DialogMetaData
+                innerList.AddRange(dialog.AdditionalMessageWrapper.Messages);
-                {
-                    Role = dialog.Role,
-                    AgentId = dialog.CurrentAgentId,
-                    MessageId = dialog.MessageId,
-                    MessageType = dialog.MessageType,
-                    FunctionName = dialog.FunctionName,
-                    FunctionArgs = dialog.FunctionArgs,
-                    ToolCallId = dialog.ToolCallId,
-                    CreatedTime = dialog.CreatedAt
-                };
-
-                var content = dialog.Content.RemoveNewLine();
-                if (string.IsNullOrEmpty(content))
-                {
-                    continue;
-                }
-                dialogElements.Add(new DialogElement
-                {
-                    MetaData = meta,
-                    Content = dialog.Content,
-                    SecondaryContent = dialog.SecondaryContent,
-                    Payload = dialog.Payload
-                });
             }
-            else
+
+            foreach (var item in innerList)
             {
-                var meta = new DialogMetaData
+                var element = BuildDialogElement(item);
+                if (element != null)
                 {
-                    Role = dialog.Role,
+                    dialogElements.Add(element);
-                    AgentId = dialog.CurrentAgentId,
-                    MessageId = dialog.MessageId,
-                    MessageType = dialog.MessageType,
-                    SenderId = dialog.SenderId,
-                    FunctionName = dialog.FunctionName,
-                    CreatedTime = dialog.CreatedAt
-                };
-
-                var content = dialog.Content.RemoveNewLine();
-                if (string.IsNullOrEmpty(content))
-                {
-                    continue;
                 }
-
-                var richContent = dialog.RichContent != null ? JsonSerializer.Serialize(dialog.RichContent, _options.JsonSerializerOptions) : null;
-                var secondaryRichContent = dialog.SecondaryRichContent != null ? JsonSerializer.Serialize(dialog.SecondaryRichContent, _options.JsonSerializerOptions) : null;
-                dialogElements.Add(new DialogElement
-                {
-                    MetaData = meta,
-                    Content = dialog.Content,
-                    SecondaryContent = dialog.SecondaryContent,
-                    RichContent = richContent,
-                    SecondaryRichContent = secondaryRichContent,
-                    Payload = dialog.Payload
-                });
             }
         }
 
@@ -148,4 +107,67 @@ public class ConversationStorage : IConversationStorage
 
         return results;
     }
+
+    private DialogElement? BuildDialogElement(RoleDialogModel dialog)
+    {
+        DialogElement? element = null;
+
+        if (dialog.Role == AgentRole.Function)
+        {
+            var meta = new DialogMetaData
+            {
+                Role = dialog.Role,
+                AgentId = dialog.CurrentAgentId,
+                MessageId = dialog.MessageId,
+                MessageType = dialog.MessageType,
+                FunctionName = dialog.FunctionName,
+                FunctionArgs = dialog.FunctionArgs,
+                ToolCallId = dialog.ToolCallId,
+                CreatedTime = dialog.CreatedAt
+            };
+
+            var content = dialog.Content.RemoveNewLine();
+            if (!string.IsNullOrEmpty(content))
+            {
+                element = new DialogElement
+                {
+                    MetaData = meta,
+                    Content = dialog.Content,
+                    SecondaryContent = dialog.SecondaryContent,
+                    Payload = dialog.Payload
+                };
+            }
+        }
+        else
+        {
+            var meta = new DialogMetaData
+            {
+                Role = dialog.Role,
+                AgentId = dialog.CurrentAgentId,
+                MessageId = dialog.MessageId,
+                MessageType = dialog.MessageType,
+                SenderId = dialog.SenderId,
+                FunctionName = dialog.FunctionName,
+                CreatedTime = dialog.CreatedAt
+            };
+
+            var content = dialog.Content.RemoveNewLine();
+            if (!string.IsNullOrEmpty(content))
+            {
+                var richContent = dialog.RichContent != null ? JsonSerializer.Serialize(dialog.RichContent, _options.JsonSerializerOptions) : null;
+                var secondaryRichContent = dialog.SecondaryRichContent != null ? JsonSerializer.Serialize(dialog.SecondaryRichContent, _options.JsonSerializerOptions) : null;
+                element = new DialogElement
+                {
+                    MetaData = meta,
+                    Content = dialog.Content,
+                    SecondaryContent = dialog.SecondaryContent,
+                    RichContent = richContent,
+                    SecondaryRichContent = secondaryRichContent,
+                    Payload = dialog.Payload
+                };
+            }
+        }
+
+        return element;
+    }
 }

src/Infrastructure/BotSharp.Core/Routing/RoutingService.InvokeFunction.cs

@@ -65,6 +65,7 @@ public partial class RoutingService
             message.StopCompletion = clonedMessage.StopCompletion;
             message.RichContent = clonedMessage.RichContent;
             message.Data = clonedMessage.Data;
+            message.AdditionalMessageWrapper = clonedMessage.AdditionalMessageWrapper;
         }
         catch (JsonException ex)
         {

src/Plugins/BotSharp.Plugin.ChartHandler/BotSharp.Plugin.ChartHandler.csproj

@@ -30,6 +30,5 @@
 
   <ItemGroup>
     <ProjectReference Include="..\..\Infrastructure\BotSharp.Core\BotSharp.Core.csproj" />
-    <ProjectReference Include="..\BotSharp.Plugin.ChatHub\BotSharp.Plugin.ChatHub.csproj" />
   </ItemGroup>
 </Project>

src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs

@@ -1,9 +1,4 @@
-using BotSharp.Abstraction.Conversations.Dtos;
-using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.Messaging.Models.RichContent.Template;
-using BotSharp.Abstraction.Users;
-using BotSharp.Plugin.ChatHub.Helpers;
-using System.Runtime.CompilerServices;
 
 namespace BotSharp.Plugin.ChartHandler.Functions;
 
@@ -11,6 +6,7 @@ public class PlotChartFn : IFunctionCallback
 {
     private readonly IServiceProvider _services;
     private readonly ILogger<PlotChartFn> _logger;
+    private readonly ChartHandlerSettings _settings;
     private readonly BotSharpOptions _options;
 
     public string Name => "util-chart-plot_chart";
@@ -20,10 +16,12 @@ public class PlotChartFn : IFunctionCallback
     public PlotChartFn(
         IServiceProvider services,
         ILogger<PlotChartFn> logger,
+        ChartHandlerSettings settings,
         BotSharpOptions options)
     {
         _services = services;
         _logger = logger;
+        _settings = settings;
         _options = options;
     }
 
@@ -43,7 +41,7 @@ public class PlotChartFn : IFunctionCallback
             Instruction = inst,
             LlmConfig = new AgentLlmConfig
             {
-                MaxOutputTokens = 8192
+                MaxOutputTokens = _settings?.ChartPlot?.MaxOutputTokens ?? 8192
             },
             TemplateDict = new Dictionary<string, object>
             {
@@ -52,7 +50,8 @@ public class PlotChartFn : IFunctionCallback
             }
         };
 
-        var response = await GetChatCompletion(innerAgent, [
+        var response = await GetChatCompletion(innerAgent,
+        [
             new RoleDialogModel(AgentRole.User, "Please follow the instruction to generate the javascript code.")
             {
                 CurrentAgentId = message.CurrentAgentId,
@@ -72,59 +71,32 @@ public class PlotChartFn : IFunctionCallback
             }
         };
 
-        // Send report summary after 1.5 seconds if exists
         if (!string.IsNullOrEmpty(obj?.ReportSummary))
         {
-            _ = Task.Run(async () =>
+            message.AdditionalMessageWrapper = new()
             {
-                var services = _services.CreateScope().ServiceProvider;
+                IntervalMilliSeconds = 1500,
-                await Task.Delay(1500);
+                SaveToDb = true,
-                await SendDelayedMessage(services, obj.ReportSummary, convService.ConversationId, agent.Id, agent.Name);
+                Messages = new List<RoleDialogModel>
-            });
+                {
+                    new()
+                    {
+                        Role = AgentRole.Assistant,
+                        MessageId = message.MessageId,
+                        CurrentAgentId = message.CurrentAgentId,
+                        Content = obj.ReportSummary,
+                        FunctionName = message.FunctionName,
+                        FunctionArgs = message.FunctionArgs,
+                        CreatedAt = DateTime.UtcNow
+                    }
+                }
+            };
         }
 
         message.StopCompletion = true;
         return true;
     }
 
-    private async Task SendDelayedMessage(IServiceProvider services, string text, string conversationId, string agentId, string agentName)
-    {
-        try
-        {
-            var messageId = Guid.NewGuid().ToString();
-            var messageData = new ChatResponseDto
-            {
-                ConversationId = conversationId,
-                MessageId = messageId,
-                Text = text,
-                Sender = new() { FirstName = agentName, LastName = "", Role = AgentRole.Assistant }
-            };
-            
-            var dialogModel = new RoleDialogModel(AgentRole.Assistant, text)
-            {
-                MessageId = messageId,
-                CurrentAgentId = agentId,
-                CreatedAt = DateTime.UtcNow
-            };
-
-            var storage = services.GetService<IConversationStorage>();
-            storage?.Append(conversationId, dialogModel);
-            await SendEvent(services, ChatEvent.OnMessageReceivedFromAssistant, conversationId, messageData);
-
-        }
-        catch (Exception ex)
-        {
-            _logger.LogError(ex, "Failed to send delayed message");
-        }
-    }
-
-    private async Task SendEvent<T>(IServiceProvider services, string @event, string conversationId, T data, [CallerMemberName] string callerName = "")
-    {
-        var user = services.GetService<IUserIdentity>();
-        var json = JsonSerializer.Serialize(data, _options.JsonSerializerOptions);
-        await EventEmitter.SendChatEvent(services, _logger, @event, conversationId, user?.Id, json, nameof(PlotChartFn), callerName);
-    }
-
     private async Task<string> GetChatCompletion(Agent agent, List<RoleDialogModel> dialogs)
     {
         try
@@ -169,12 +141,11 @@ public class PlotChartFn : IFunctionCallback
         var model = "gpt-5";
 
         var state = _services.GetRequiredService<IConversationStateService>();
-        var settings = _services.GetRequiredService<ChartHandlerSettings>();
         provider = state.GetState("chart_plot_llm_provider")
-                        .IfNullOrEmptyAs(settings.ChartPlot?.LlmProvider)
+                        .IfNullOrEmptyAs(_settings.ChartPlot?.LlmProvider)
                         .IfNullOrEmptyAs(provider);
         model = state.GetState("chart_plot_llm_model")
-                     .IfNullOrEmptyAs(settings.ChartPlot?.LlmModel)
+                     .IfNullOrEmptyAs(_settings.ChartPlot?.LlmModel)
                      .IfNullOrEmptyAs(model);
 
         return (provider, model);

src/Plugins/BotSharp.Plugin.ChartHandler/Settings/ChartHandlerSettings.cs

@@ -7,6 +7,7 @@ public class ChartHandlerSettings
 
 public class ChartPlotSetting
 {
-    public string LlmProvider { get; set; }
+    public string? LlmProvider { get; set; }
-    public string LlmModel { get; set; }
+    public string? LlmModel { get; set; }
+    public int? MaxOutputTokens { get; set; }
 }

src/Plugins/BotSharp.Plugin.ChartHandler/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/templates/util-chart-plot_instruction.liquid

@@ -1,29 +1,39 @@
 Please take a look at "Plotting Requirement" and generate a javascript code that can be used to render the charts on an html element.
+You must strictly follow the "Hard Requirements", "Render Requirements", "Code Requirements" and "Response Format" below.
 
 === Plotting Requirement ===
 {{ plotting_requirement }}
 
+
 ***** Hard Requirements *****
 ** Your output javascript code must be wrapped in one or multiple <script>...</script> blocks with everything needed inside.
-** You need to import ECharts.js to plot the charts. The script source is "https://cdnjs.cloudflare.com/ajax/libs/echarts/6.0.0/echarts.min.js".
+** You need to import ECharts.js exactly once to plot the charts. The script source is "https://cdnjs.cloudflare.com/ajax/libs/echarts/5.5.1/echarts.min.js".
-** You need to add the MODE bar for each chart you plot.
+** You must add an ECharts Toolbox bar at the top left corner of the chart.
-** You must render the charts under the div html element with id {{ chart_element_id }}.
+** ALWAYS add a "Full screen" button right next to the Toolbox bar.
-** Add a custom mode bar button named "Fullscreen" that toggles the chart container in and out of fullscreen using the Fullscreen API. Requirements for this button:
+** The "Full screen" button can toggle the chart container in and out of fullscreen using the Fullscreen API. Requirements for this button:
-    * Always call the Fullscreen API on the chart container div itself (document.getElementById("{{ chart_element_id }}")), not on the document or on Plotly’s SVG.
+    * Always call the Fullscreen API on the chart container div itself (document.getElementById("{{ chart_element_id }}")), not on the document.
     * Use el.requestFullscreen() with fallbacks to el.webkitRequestFullscreen || el.msRequestFullscreen.
     * Exit fullscreen with document.exitFullscreen() and vendor fallbacks.
     * Listen for fullscreenchange, webkitfullscreenchange, and msfullscreenchange to keep the button working across repeated clicks and ESC exits.
     * Ensure the chart fully expands and scales to the entire screen when fullscreen is active.
-    * Provide a simple inline SVG path icon for the button (no external assets).
+    * fullscreenBtn must be a fully-formed object {show: true, name, title, icon: 'path://M3 3 H9 V5 H5 V9 H3 Z M15 3 H21 V9 H19 V5 H15 Z M3 15 H5 V19 H9 V21 H3 Z M19 15 H21 V21 H15 V19 H19 Z', onclick}.
-    * Use Plotly.newPlot(container, data, layout, {displayModeBar:true, modeBarButtonsToAdd:[fullscreenBtn]});
+    * When using "chart.setOption" to define the fullscreen button, DO NOT use "graphic". Include the fullscreenBtn object in toolbox.feature with name 'myFullscreen'.
-    * fullscreenBtn must be a fully-formed object {name, title, icon, click}.
+
+
+***** Render Requirements *****
+** You must render the charts under the div html element with id {{ chart_element_id }}.
 ** You must not create any new html element.
+** You must ensure the generated charts have visible height (at least 500px) and width (at least 800px). DO NOT generate charts with zero height or zero width.
 ** You must not apply any styles on any html element.
-** Keep code compact (few tokens), but fix all errors before returning.
+
-** Do not generate charts with zero height and zero width.
+
+***** Code Requirements *****
+** You must strictly follow the valid javascript and ECharts.js syntax.
+** You must ensure no syntax/runtime error before returning the response.
 ** Please ensure the code can be executed and the charts are rendered correctly.
 
-*** Response Format ***
+
+***** Response Format *****
 You must output the response in the following JSON format:
 {
     "greeting_message": "A short polite message that informs user that the charts have been generated.",

src/Plugins/BotSharp.Plugin.ChatHub/Helpers/EventEmitter.cs

@@ -3,9 +3,9 @@ using System.Runtime.CompilerServices;
 
 namespace BotSharp.Plugin.ChatHub.Helpers;
 
-public class EventEmitter
+internal class EventEmitter
 {
-    public static async Task SendChatEvent<T>(
+    internal static async Task SendChatEvent<T>(
         IServiceProvider services,
         ILogger logger,
         string @event,

src/Plugins/BotSharp.Plugin.ChatHub/Hooks/ChatHubConversationHook.cs

@@ -5,6 +5,7 @@ using BotSharp.Abstraction.Routing.Models;
 using BotSharp.Abstraction.SideCar;
 using BotSharp.Abstraction.Users.Dtos;
 using Microsoft.AspNetCore.SignalR;
+using System;
 using System.Runtime.CompilerServices;
 
 namespace BotSharp.Plugin.ChatHub.Hooks;
@@ -112,15 +113,48 @@ public class ChatHubConversationHook : ConversationHookBase
             }
         };
 
-        // Send typing-off to client
+        // Send type-off to client
         var action = new ConversationSenderActionModel
         {
             ConversationId = conv.ConversationId,
             SenderAction = SenderActionEnum.TypingOff
         };
         await SendEvent(ChatEvent.OnSenderActionGenerated, conv.ConversationId, action);
-
         await SendEvent(ChatEvent.OnMessageReceivedFromAssistant, conv.ConversationId, data);
+
+        if (message.AdditionalMessageWrapper?.Messages?.Count > 0)
+        {
+            action.SenderAction = SenderActionEnum.TypingOn;
+            await SendEvent(ChatEvent.OnSenderActionGenerated, conv.ConversationId, action);
+
+            foreach (var item in message.AdditionalMessageWrapper.Messages)
+            {
+                await Task.Delay(message.AdditionalMessageWrapper.IntervalMilliSeconds);
+
+                data = new ChatResponseDto
+                {
+                    ConversationId = conv.ConversationId,
+                    MessageId = item.MessageId,
+                    Text = !string.IsNullOrEmpty(item.SecondaryContent) ? item.SecondaryContent : item.Content,
+                    Function = item.FunctionName,
+                    RichContent = item.SecondaryRichContent ?? item.RichContent,
+                    Data = item.Data,
+                    States = state.GetStates(),
+                    IsAppend = true,
+                    Sender = new()
+                    {
+                        FirstName = "AI",
+                        LastName = "Assistant",
+                        Role = AgentRole.Assistant
+                    }
+                };
+                await SendEvent(ChatEvent.OnMessageReceivedFromAssistant, conv.ConversationId, data);
+            }
+
+            action.SenderAction = SenderActionEnum.TypingOff;
+            await SendEvent(ChatEvent.OnSenderActionGenerated, conv.ConversationId, action);
+        }
+
         await base.OnResponseGenerated(message);
     }