Add reproduction test for custom logger conflict issue

This test demonstrates the original problem where custom Python loggers
don't work when CrewAI's verbose=True is enabled, and can be used to
verify the fix works correctly.

Co-Authored-By: Jo\u00E3o <joao@crewai.com>

test_logging_reproduction.py

@@ -0,0 +1,97 @@
+"""
+Reproduction test for issue #3197: Custom logger conflicts with Crew AI logging
+This script demonstrates the problem where custom Python loggers don't work 
+when CrewAI's verbose=True is enabled.
+"""
+import logging
+from crewai import Agent, Task, Crew
+from crewai.tools import BaseTool
+from pydantic import BaseModel, Field
+
+
+class TestInput(BaseModel):
+    message: str = Field(description="Message to log")
+
+
+class CustomLoggingTool(BaseTool):
+    name: str = "custom_logging_tool"
+    description: str = "A tool that uses Python's logging module to demonstrate the conflict"
+    args_schema: type[BaseModel] = TestInput
+
+    def _run(self, message: str) -> str:
+        logger = logging.getLogger("custom_tool_logger")
+        logger.setLevel(logging.INFO)
+        
+        if not logger.handlers:
+            handler = logging.StreamHandler()
+            formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+            handler.setFormatter(formatter)
+            logger.addHandler(handler)
+        
+        logger.info(f"CUSTOM LOGGER MESSAGE: {message}")
+        print(f"PRINT MESSAGE: {message}")
+        
+        return f"Logged message: {message}"
+
+
+def test_logging_with_verbose_true():
+    """Test case that reproduces the logging conflict when verbose=True"""
+    print("=== Testing with verbose=True (should show logging conflict) ===")
+    
+    agent = Agent(
+        role="Test Agent",
+        goal="Test custom logging functionality",
+        backstory="An agent that tests logging",
+        tools=[CustomLoggingTool()],
+        verbose=True
+    )
+    
+    task = Task(
+        description="Use the custom logging tool to log a test message",
+        expected_output="A confirmation that the message was logged",
+        agent=agent
+    )
+    
+    crew = Crew(
+        agents=[agent],
+        tasks=[task],
+        verbose=True
+    )
+    
+    result = crew.kickoff()
+    print(f"Result: {result}")
+
+
+def test_logging_with_verbose_false():
+    """Test case that shows logging works when verbose=False"""
+    print("\n=== Testing with verbose=False (logging should work) ===")
+    
+    agent = Agent(
+        role="Test Agent",
+        goal="Test custom logging functionality", 
+        backstory="An agent that tests logging",
+        tools=[CustomLoggingTool()],
+        verbose=False
+    )
+    
+    task = Task(
+        description="Use the custom logging tool to log a test message",
+        expected_output="A confirmation that the message was logged",
+        agent=agent
+    )
+    
+    crew = Crew(
+        agents=[agent],
+        tasks=[task],
+        verbose=False
+    )
+    
+    result = crew.kickoff()
+    print(f"Result: {result}")
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.INFO)
+    
+    test_logging_with_verbose_false()
+    test_logging_with_verbose_true()