<no-longer-relevant>Given that it captures messages and processes them somehow, having visibility into the business logic involved would help create trust (especially so since "messages that sound more heated than intended" implies that message content is being sent out to a third-party LLM).</no-longer-relevant>

EDIT: I ended up pulling the source from wherever the browser extensions live out of curiosity, I take that part about third-parties back. Given how many of these extensions feel like data grabs, I'd suggest leaning more on the "this doesn't make any network requests to anything" angle. It's a huge plus when handling sensitive data. Now, saying it doesn't quite replace posting the source upfront so users can audit it themselves, but it's a great step in the right direction.

Gmail already has this, it'll say "It seems like you forgot to attach a file."