Oh interesting—how do you find OpenCode vs CC? I'll check it out. And I'll try to get a version of this assistant in a form I could share publicly.

I wouldn't say it was oneshotted, but it did produce a working MVP in one Plan execution. Meaning, I went back & forth a few times about requirements, it built a plan, and then CC spent just under 15 minutes writing the code. Once I got the credentials plugged in, the core integrations (Slack, gmail, IMAP, iCloud calendar) and agent loop did work. I can share the initial message if you're curious.