In my specific case, implementing modern documentation for Remote Imaging Protocol (and old graphics protocol for terminal/bbs usage), and in particular trying to gather what exists of the later version released. The company itself folded, and there wasn't a lot of broad use of the later versions, and only partial information was ever released as a documentation. Claude was able to interrogate the apps, and some available open source, in progress work, and establish a lot of things.
I've still got to direct some edits... I guided a re-flow of the order the documentation was written in, particularly to be consistent between the versions... but it obsessively added verbose summaries to every page/file. All markdown, meant to build a website from, and eventually some compatibility tests, guidelines and a green/open implementation.