Update Patronus AI evaluator tool and example

src/crewai_tools/tools/patronus_eval_tool/example.py

@@ -1,34 +1,27 @@
-import os
-
 from crewai import Agent, Crew, Task
 from patronus_eval_tool import PatronusEvalTool
 
 
 patronus_eval_tool = PatronusEvalTool(
-    evaluators=[{
-        "evaluator": "judge",
-        "criteria": "patronus:is-code"
-    }],
-    tags={}
+    evaluators=[{"evaluator": "judge", "criteria": "patronus:is-code"}], tags={}
 )
 
 # Create a new agent
 coding_agent = Agent(
     role="Coding Agent",
-    goal="Generate high quality code. Use the evaluation tool to score the agent outputs",
-    backstory="Coding agent to generate high quality code. Use the evaluation tool to score the agent outputs",
+    goal="Generate high quality code and verify that the code is correct by using Patronus AI's evaluation tool to check validity of your output code.",
+    backstory="You are an experienced coder who can generate high quality python code. You can follow complex instructions accurately and effectively.",
     tools=[patronus_eval_tool],
     verbose=True,
 )
 
 # Define tasks
 generate_code = Task(
-    description="Create a simple program to generate the first N numbers in the Fibonacci sequence.",
+    description="Create a simple program to generate the first N numbers in the Fibonacci sequence. Use the evaluator as `judge` from Patronus AI with the criteria `patronus:is-code` and feed your task input as input and your code as output to verify your code validity.",
     expected_output="Program that generates the first N numbers in the Fibonacci sequence.",
     agent=coding_agent,
 )
 
-
 crew = Crew(agents=[coding_agent], tasks=[generate_code])
 
-crew.kickoff()
+crew.kickoff()