A few months ago I needed an agentic coding assistant inside a internal CI repair tool I was building. The obvious move was to embed something that already exists — Claude Code, or Google's Antigravity SDK. Both work well. Neither one gets you what you actually need once you're shipping a product on top of it. Claude Code isn't embeddable as infrastructure. You can shell out to it, but you don't own the runtime, the protocol, or the failure modes. Antigravity gets you closer, it's an SDK you ...