Address PR feedback: Add validation, error handling, refactoring, and tests

Co-Authored-By: Joe Moura <joao@crewai.com>

docs/how-to/human-input-on-execution.mdx

@@ -20,10 +20,20 @@ By default, human input is collected via the command line using the `input()` fu
 
 ```python
 def get_input_from_api(final_answer: str) -> str:
-    """Get human feedback from an API instead of CLI."""
-    # Make an API call to get feedback
-    response = requests.post("https://your-api.com/feedback", json={"answer": final_answer})
-    return response.json()["feedback"]
+    """Get human feedback from an API instead of CLI with error handling."""
+    try:
+        # Make an API call to get feedback
+        response = requests.post(
+            "https://your-api.com/feedback", 
+            json={"answer": final_answer},
+            timeout=10  # Set timeout to avoid long waits
+        )
+        response.raise_for_status()  # Raise exception for HTTP errors
+        return response.json().get("feedback", "")
+    except (requests.RequestException, json.JSONDecodeError, KeyError) as e:
+        print(f"Error getting feedback from API: {str(e)}")
+        # Fallback to CLI input if API fails
+        return input(f"API failed, please provide feedback manually:\n\n{final_answer}\n\nYour feedback: ")
 
 task = Task(
     description="Analyze the latest market trends",
@@ -34,6 +44,8 @@ task = Task(
 )
 ```
 
+Note: CrewAI will automatically fallback to the default input method if your custom function raises an exception, but implementing your own fallback gives you more control over the user experience.
+
 The custom function should:
 - Accept a string parameter (the agent's final answer)
 - Return a string (the human feedback)