diff --git a/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs b/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs
index 20047b76c..8e8106835 100644
--- a/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs
+++ b/src/Plugins/BotSharp.Plugin.ChartHandler/Functions/PlotChartFn.cs
@@ -33,6 +33,10 @@ public async Task<bool> Execute(RoleDialogModel message)
             Id = agent.Id,
             Name = agent.Name,
             Instruction = inst,
+            LlmConfig = new AgentLlmConfig
+            {
+                MaxOutputTokens = 8192
+            },
             TemplateDict = new Dictionary<string, object>
             {
                 { "plotting_requirement", args?.PlottingRequirement ?? string.Empty },
diff --git a/src/Plugins/BotSharp.Plugin.ChartHandler/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/templates/util-chart-plot_instruction.liquid b/src/Plugins/BotSharp.Plugin.ChartHandler/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/templates/util-chart-plot_instruction.liquid
index dc4523f89..0d631b51d 100644
--- a/src/Plugins/BotSharp.Plugin.ChartHandler/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/templates/util-chart-plot_instruction.liquid
+++ b/src/Plugins/BotSharp.Plugin.ChartHandler/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/templates/util-chart-plot_instruction.liquid
@@ -4,10 +4,10 @@ Please take a look at "Plotting Requirement" and generate a javascript code that
 {{ plotting_requirement }}
 
 ***** Hard Requirements *****
-** Your output must be a single <script>...</script> block with everything needed inside.
-** You need to import Plotly.js to plot the charts. The script source should be "https://cdn.plot.ly/plotly-3.0.1.min.js".
+** 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 add the MODE bar for each chart you plot.
-** You must render the charts on the div html element with id {{ chart_element_id }}.
+** You must render the charts under the div html element with id {{ chart_element_id }}.
 ** 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:
     * 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.
     * Use el.requestFullscreen() with fallbacks to el.webkitRequestFullscreen || el.msRequestFullscreen.
@@ -20,7 +20,8 @@ Please take a look at "Plotting Requirement" and generate a javascript code that
 ** You must not create any new html element.
 ** You must not apply any styles on any html element.
 ** Keep code compact (few tokens), but fix all errors before returning.
-** Please fix any code errors before returning the final response.
+** Do not generate charts with zero height and zero width.
+** Please ensure the code can be executed and the charts are rendered correctly.
 
 *** Response Format ***
 You must output the response in the following JSON format: