Most in-app AI frameworks (CopilotKit, Vercel AI SDK, Mastra) run the agent loop on the server. I tried inverting it: the loop runs in the browser, the server is a thin LLM proxy. Tools are just your existing client functions (store actions, click handlers, whatever you already wrote). Scopes - a unit of tools with live context that gets injected into the system or user prompt. WebMCP plugin - exposes your agent's tools through the browser API. Demo: https://ag2b-example.vercel.app Looking for feedback from people who've built in-app copilots — does the client-side loop solve a real problem for you, or is the server-side fine? submitted by /u/notmedia [link] [comments]