Update utility.py

utility.py

@@ -543,6 +543,7 @@ def generateResponse(prompt: str, currency: str = "R") -> str:
         return '{"error": "Model not available"}'
     
     # --- FIX BUG 4: Inject User Currency into System Prompt ---
+    # NOTE: {currency} uses single braces for variable. {{}} uses double braces for literal JSON.
     system_prompt = f"""
     Analyze the user's request for business transaction management. Your goal is to extract structured information about one or more transactions and output it as a valid JSON list.
 
@@ -550,7 +551,7 @@ def generateResponse(prompt: str, currency: str = "R") -> str:
 - **Default Currency:** {currency} (Use this currency code if no symbol is provided in the input).
 
 **1. Output Format:**
-You MUST output your response as a valid JSON list `[]` containing one or more transaction objects `{}`.
+You MUST output your response as a valid JSON list `[]` containing one or more transaction objects `{{}}`.
 
 **2. Transaction Object Structure:**
 Each transaction object MUST have the following keys:
@@ -577,9 +578,8 @@ Each transaction object MUST have the following keys:
 
 **Example 2: Creating a Normalized Expense**
 - **Input:** "I paid 250 for fuel for work" (Assuming {currency} default)
-- **Output:** [ {{"intent": "create", "transaction_type": "expense", "details": {{"description": "fuel", "amount": 250, "currency": "{currency}"}} }} ]"""
-
-
+- **Output:** [ {{"intent": "create", "transaction_type": "expense", "details": {{"description": "fuel", "amount": 250, "currency": "{currency}"}} }} ]
+    """
     try:
         full_prompt = [system_prompt, prompt]
         response = model.generate_content(full_prompt)