OpenCode is great and `opencode serve` in particular is very cool. Though I think the main thing is that you need to manage the OpenCode server yourself and expose it via tailscale or something like that. Our goal is to provide managed infrastructure around the coding agent harness with features like mobile, sandboxes, preview urls, etc.
Our goal is to be harness agnostic as well, so eventually we will be adding support for running OpenCode sessions in Omnara.
When I say harness agnostic, I more mean we're agnostic to what harness is running, sort of like Zed with ACP: https://agentclientprotocol.com/overview/introduction. It still necessitates bringing the SDK and us writing an adapter for the SDK, but you still get to use the same chat interface for all the agent SDKs.
Our goal is to be harness agnostic as well, so eventually we will be adding support for running OpenCode sessions in Omnara.