Update app.py

app.py

@@ -167,14 +167,16 @@ def analyze_data(csv_file, additional_notes=""):
 
     # Run agent on cleaned CSV
     raw_output = agent.run("""
-        You are a data analysis agent. Follow these instructions EXACTLY:
+        You are a data analysis agent. Output in JSON only. Follow these instructions EXACTLY:
         1. Load the data from the given `source_file` ONLY. DO NOT create your OWN DATA.
         2. Analyze the data structure and generate up to 3 visualizations and 3 insights.
         3. Save all figures to `./figures` as PNG using matplotlib or seaborn.
         4. Use only authorized imports: `pandas`, `numpy`, `matplotlib.pyplot`, `seaborn`, `json`.
         5. DO NOT return any explanations, thoughts, or narration outside the final JSON block
         6. Run only 5 iteration and return output quickly.
-        7. Output ONLY the following JSON code block format, exactly:
+        7. DO NOT include any natural language (e.g., "Thoughts:", "Code:", explanations).
+        8. ONLY output a single, valid JSON block. No markdown or extra text.
+        9. Output ONLY the following JSON code block format, exactly:
         {
             'observations': {
                 'observation_1_key': 'observation_1_value',