The repository's README.md links to <https://docs.streamdal.com/sdks>, which is not there.

Those SDKs are simply libraries though, aren't they? "SDK" often stands for more than that (e.g., development tools, bits of code not properly packaged), and may be appalling if you don't want to wrap a project around such an SDK, as opposed to merely incorporating a library.

But then I wonder why it has to be a library at all, limited to just 3 languages: why not to implement a more unixy interface, perhaps with named pipes? And/or a library with C API (so that it can be called from any common language), providing file descriptors to write into. With the former approach, basic named pipes or files and actual tail -f can be used, too.