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.
This is pretty basic, but seems effective.
In the Claude settings you can provide a system prompt. Here's a slightly-edited version of the one I use. While short, I've found that this generally seems to improve conversations for me. Specifically, I like that Claude seems very eager to try estimating things numerically. One weird but minor downside though is that it will sometimes randomly bring up items here in conversation, like, "I suggest writing that down, using your Glove80 keyboard."