doop puts a multiplayer design canvas behind an MCP server so Claude Code streams frames in next to your cursor
GitHub·medium signal
kgoedecke/doop took 255 stars and 22 forks in the two days after its 2026-08-22 creation, positioned as the AGPL-3.0 open-source alternative to Paper.design. Designs live on a shareable canvas of frames that render real HTML in sandboxed iframes; people edit in the browser and agents edit through the built-in MCP server, with live cursors, presence and an activity feed showing both. A scripted demo agent performs on the first canvas even with no API key configured.