Is there a workspace for AI-generated UI?

Yes — Vessel. It's the open-source workspace built specifically for reviewing UI that AI coding agents (Claude Code, v0, Bolt, Lovable, Cursor, Replit Agent) produce. Drop the zip, render it live, comment on the canvas, dispatch fixes back to the agent.

The category needed a name

Frontend has had a workspace for design files (Figma), a workspace for code review (GitHub), a workspace for discussion (Slack), and a workspace for shipping (your deploy pipeline). It didn't have a workspace for the artifact AI agents now produce — a runnable bundle of TSX/JSX/MDX/HTML that has to be reviewed before it ships.

Vessel is that workspace. The interaction model is: open a project (drop a zip or paste a URL handoff), render it, talk to it. The features that follow — inspect, comment, token override, dispatch — are all in service of that one loop.

What's in the workspace

Drop: unzip + sandboxed render in the browser. No build step.

Inspect: click any rendered pixel, jump to the source file + line. Full computed styles, ancestor chain, related imports.

Comment: threads anchored to the element (not coordinates), so they survive version diffs.

Tokens: tune colors, spacing, type live and watch the running app update.

Dispatch: any inspected element + comment becomes a structured prompt sent back to Claude Code.

Versions: every upload, AI edit, and manual save is a scrubbable snapshot.

Self-host or use the hosted version

The hosted version is at usevessel.dev/app. No signup. Or clone the repo from GitHub and run it yourself — it's a static site, no backend.