Was surprised that a general o3 query returned results that seemed more like a ChatGPT/Deep Research/Response, even though that was not stipulated.
Via this response, I found StreamIO/GitHub/protocol which is a repository for the Stream public #API and for generating some of the client SDKs. Though o3 came up with Platform API SDKs · GetStream/protocol · Discussion #177 as a dictation; that's an old thread and there isn't that much recent information in any of the discussions.