Update app.py

app.py

@@ -12,11 +12,11 @@ def get_btc_price() -> str:
     url = "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd"
     response = requests.get(url)
     if response.status_code != 200:
-        return '{"error": "Failed to fetch Bitcoin price"}'
+        return "Failed to fetch Bitcoin price"
     data = response.json()
     price = data.get('bitcoin', {}).get('usd')
     if price is None:
-        return '{"error": "Bitcoin price not found"}'
+        return "Bitcoin price not found"
     return f"The current Bitcoin price is ${price:.2f} USD."
 
 @tool
@@ -29,7 +29,7 @@ def get_btc_historical_prices(days: int = 30) -> str:
     url = f"https://api.coingecko.com/api/v3/coins/bitcoin/market_chart?vs_currency=usd&days={days}&interval=daily"
     response = requests.get(url)
     if response.status_code != 200:
-        return '{"error": "Failed to fetch historical Bitcoin prices"}'
+        return "Failed to fetch historical Bitcoin prices"
     data = response.json()
     prices = data.get('prices', [])
     df = pd.DataFrame(prices, columns=['timestamp', 'price'])