Doop Is an AGPL Multiplayer Design Canvas Where MCP Agents Draw Alongside You

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Doop (github.com/kgoedecke/doop, 580 stars, AGPL v3, 77 commits) positions itself explicitly as the open-source alternative to Paper.design: a real-time canvas where agents connect over MCP via OAuth as themselves, sketch frames, fill real copy and review their own work while a human steers. It exposes a concrete MCP toolset including list_canvases, create_canvas, view_website, import_webpage, create_frame, set_frame_html, append_frame_html, edit_frame_html and get_frame_screenshot. The architectural bet is that a design tool's API surface should be HTML frames an agent can append to incrementally, not a proprietary vector document format, which is a different attack on Figma than yet another text-to-mockup generator.