diff --git a/server.py b/server.py
index 866a6cf..e50b841 100644
--- a/server.py
+++ b/server.py
@@ -1589,7 +1589,14 @@ async def run_plan_visualization(run_id: str, request: Request):
     '''
 
     # Add collapsible Plan JSON section
-    plan_json_str = json.dumps(plan_data, indent=2)
+    # Parse nested plan_json if present (it's double-encoded as a string)
+    display_plan = plan_data.copy()
+    if "plan_json" in display_plan and isinstance(display_plan["plan_json"], str):
+        try:
+            display_plan["plan_json"] = json.loads(display_plan["plan_json"])
+        except json.JSONDecodeError:
+            pass
+    plan_json_str = json.dumps(display_plan, indent=2)
     # Escape HTML entities in JSON
     plan_json_str = plan_json_str.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
     content += f'''