I've found Claude to be very useful when writing on the EA Forum. However, certain prompting and other techniques can help a lot.
The main use case I'm personally interested in is writing and interacting with content on the EA Forum / LessWrong and similar, but I'm sure there are other use cases that would be relevant to this community.
Strong agree about context. As a shortcut / being somewhat lazy, I usually give it an introduction I wrote, or a full pitch, then ask it to find relevant literature and sources, and outline possible arguments, before asking it to do something more specific.
I then usually like starting a new session with just the correct parts, so that it's not chasing the incorrect directions it suggested earlier - sometimes with explicit text explaining why obvious related / previously suggested arguments are wrong or unrelated.