TypeError: 'ActionSearch' object is not subscriptable (deep research API)

[loopasam]

Notebook containing the bug: https://github.com/openai/openai-cookbook/blob/main/examples/deep_research_api/introduction_to_deep_research_api.ipynb

This block:

# Find the first web search step
search = next(item for item in response.output if item.type == "web_search_call")
print("Query:", search.action["query"])
print("Status:", search.status)

Produces an error: TypeError: 'ActionSearch' object is not subscriptable

Fix: Use object dot notation instead, replace

search.action["query"] with search.action.query