Neat, are you able to handle threads/responses well even if the responder is not from gmail? I worked on a toy project and put together a library for myself over time that was harder to do then I expected due to the various email nuances:
http://fraind.email, I noted what I think would make a reasonable email library/offering to simplify this here:
http://fraind.email/augmAIl, the top ones were:
1. make it so you don't have to give every AI Agent access to your entire inbox, route only specific info to them for their specialty
2. easily track what they've done and "read"
3. easily transform email into the standard chat thread
4. add whitelists/blacklists/etc. to not respond to or send to the AI assistant
I think there's a lot to do in this space, I'll check out your code!