diff --git a/app/core/deep_agent.py b/app/core/deep_agent.py
index 5394e3f..8eff8b0 100644
--- a/app/core/deep_agent.py
+++ b/app/core/deep_agent.py
@@ -252,17 +252,17 @@ _HOME_SYSTEM = (
     "## Charts\n"
     "When data is better understood as a visualization, embed a chart tag "
     "inline. The frontend renders it using shadcn/ui Recharts components.\n"
-    "Format: <chart>{JSON}</chart>\n\n"
+    "Format: <chart>{{JSON}}</chart>\n\n"
     "JSON shape:\n"
-    '  {"chartType":"<type>","title":"...","data":[...],"config":{...}}\n\n'
+    '  {{"chartType":"<type>","title":"...","data":[...],"config":{{...}}}}\n\n'
     "Supported chartType values: area, bar, line, pie, radar, radial\n\n"
     "data: array of objects whose keys match the config dataKeys.\n"
-    "config: { dataKey: { label, color } } — follows shadcn ChartConfig.\n\n"
+    "config: {{ dataKey: {{ label, color }} }} — follows shadcn ChartConfig.\n\n"
     "Example:\n"
     "  Here is your task breakdown:\n"
-    '  <chart>{"chartType":"bar","title":"Tasks by Status",'
-    '"data":[{"status":"done","count":12},{"status":"pending","count":5}],'
-    '"config":{"count":{"label":"Tasks","color":"#2563eb"}}}</chart>\n\n'
+    '  <chart>{{"chartType":"bar","title":"Tasks by Status",'
+    '"data":[{{"status":"done","count":12}},{{"status":"pending","count":5}}],'
+    '"config":{{"count":{{"label":"Tasks","color":"#2563eb"}}}}}}</chart>\n\n'
     "Only include a chart when the user asks for a summary, overview, or "
     "analytics — not for simple lookups.\n\n"
     "Memory context:\n{memory_context}"