It's definitely not as trivial as the json converter. But not anywhere even close to complex. Recording audio is very simple, calling a remote API is too. The complex part is encoding the WAV blob. But that is just knowledge about the format with the exact code snippet that claude uses found in the first stack overflow answer.

And it is strange that Claude picked the AudioRecorder when the MediaRecorder exists. I'd wager a beginner would have used the latter(i don't use javascript and am not better than a beginner in any way, but i found that) since it outputs a straight wav file and doesn't need the encoding step. And since the data isn't streamed to OpenAI there's no need for the audio chunks that AudioRecorder provides. So Claude did it in an unnecessarily complex way, that doesn't make the problem complex.