Clean up fibonacci agent

Author: dirkbrnd

cookbook/examples/agents/fib_calcs_agent.py renamed to cookbook/examples/agents/fibonacci_agent.py

@@ -3,17 +3,16 @@
 from agno.agent import Agent
 from agno.models.openai import OpenAIChat
 from agno.tools.calculator import CalculatorTools
-from agno.tools import tool
 
-def get_fibonacci_series(count: int = 5) -> int:
+def get_fibonacci_series(count: int = 5) -> str:
     """Generate a Fibonacci series up to the specified count."""
     if count <= 0:
         return "Count must be a positive integer."
-    
+
     fib_series = [0, 1]
     for i in range(2, count):
         fib_series.append(fib_series[-1] + fib_series[-2])
-    
+
     return json.dumps(fib_series[:count])
 
 agent = Agent(
@@ -26,13 +25,13 @@ def get_fibonacci_series(count: int = 5) -> int:
             exponentiate=True,
             is_prime=True
         )
-    ], 
-    show_tool_calls=True, 
+    ],
+    show_tool_calls=True,
     markdown=True
 )
 
 agent.print_response("""
     1. Get 10 elements of fibonacci series
     2. Calculate the sum of cubes of the prime numbers in the series
     3. Subtract 4
-""", stream=True)
+""", stream=True)