In cookbook/pocketflow-agent/utils.py line 51, there is an undefined function call search_web.
When new user follows the README.md step 3 to check the web search features, it happens.

3. Let's do a quick check to make sure your API key is working properly:

python utils.py

It should be corrected to search_web_duckduckgo or search_web_brave to avoid confusion for new user guide.