Default web search to `type="approximate"`

Confirm this is a feature request for the Python library and not the underlying OpenAI API.

• This is a feature request for the Python library

Describe the feature or improvement you're requesting

Currently, if a user passes tools=[{"type": "web_search"}] to client.responses.create, it's get turned into this (on the OpenAI server side) with the country set to US:

{
    "type": "web_search",
    "search_context_size": "medium",
    "user_location": {
        "city": None,
        "country": "US",  # <- note this line
        "region": None,
        "timezone": None,
        "type": "approximate",
    },
}

And apparently this is by design.

But I would say that this is NOT what the developer wants or expects.

The workaround is to pass tools=[{"type": "web_search", "user_location": {"type": "approximate"}}] (which is what the OpenAI playground does - I guess they agree that defaulting to the US is a bad idea).

I would suggest that if the server-side isn't going to change, then defaulting to this in the SDKs will better align with user/developer expectation.

At the very least, if defaulting to the USA really is the intended behaviour in the backend and for the client SDKs, it would be nice to say so in the docs, so it's not a hidden surprise.

Something like:

Note that if you pass tools=[{"type": "web_search"}] without specifying a location, then the following string will be injected into the system prompt: "The user is in an estimated location of United States."

Additional context

No response

Start at the Python library's client.responses.create handling for tools and trace how a web_search tool without user_location is serialized. Check the relevant tests or request payload assertions, then verify that the default location type is approximate and that the documented behavior matches the resulting request.