What is oai-calculator and why is GPT calling it often?

API
1

I am using the API and recently I noticed that I would get responses like this json, at random times (but always first, before any search is done) whenever GPT decides to do a web search (not always when a search is done, but if I get this response, there is always a search afterwards):

{
    "action":
    {
        "query": "calculator: 1+1",
        "type": "search",
        "sources":
        [
            {
                "type": "api",
                "name": "oai-calculator"
            }
        ]
    },
    "id": "ws_0ef00aecf6315950006953eda092808197abf388bc13e9c949",
    "status": "completed",
    "type": "web_search_call"
}

What is the point of this? I feel like it checks if it has a connection, maybe? It is rather strange. And it is not documented (type: api is not, and sources having the property name is not); it was causing errors in my parser (unless it’s recently documented, I didn’t check).