Cnvs.App
Let your coding agent and you edit the same live whiteboard while scoping features, sketching flows, or leaving visual notes without accounts or API keys.
Overview
app.cnvs/whiteboard is a Build-phase MCP server that connects agents to zero-auth real-time collaborative whiteboards on cnvs.app.
What is this MCP server?
- 10 MCP tools: open_board, get_board, get_preview, add_text, add_link, add_image, draw_stroke, move, erase, wait_for_upda
- Zero authentication—agents and humans join the same board immediately
- Streamable HTTP remote with subscribe and cnvs:// board state plus preview.svg resources
- Bundled cnvs-whiteboard and mcp-listen skills for agent collaboration patterns
- OpenAPI at cnvs.app and protocol 2025-06-18 with quotas manifest
- 10 publisher-listed MCP tools
- 2 bundled companion skills (cnvs-whiteboard, mcp-listen)
- Authentication: none
What problem does it solve?
You need a shared visual workspace your agent can read and update live without OAuth setup or a separate design tool subscription.
Who is it for?
Solo builders and tiny teams who want MCP-driven whiteboarding for planning, wireframes, and agent-human pair sessions with no API key.
Skip if: Teams that need enterprise SSO, offline-first drawing, or pixel-perfect design systems inside Figma.
What do I get? / Deliverables
After registering the Streamable HTTP remote, your agent can open boards, mutate elements, subscribe to updates, and keep you and the model aligned on one live canvas.
- Live shared boards with text, links, images, and strokes readable via MCP and cnvs:// resources
- SVG previews and JSON board state your agent can diff across turns
- Notification-driven updates when using subscribe and wait_for_update
Recommended MCP Servers
Journey fit
Real-time boards sit where solo builders plan sprints, map user flows, and align on scope before and during implementation. PM-style collaboration—text, links, images, strokes, and moves on a shared canvas—is the natural home in build/pm rather than a one-off integration task.
How it compares
Hosted collaborative canvas MCP, not a static diagram generator skill or a generic browser automation plugin.
Common Questions / FAQ
Who is app.cnvs/whiteboard for?
Indie developers and agent users who want real-time whiteboard collaboration where both the human and the MCP client can edit the same board without signing in.
When should I use app.cnvs/whiteboard?
Use it during scoping, system sketching, or live working sessions when visual state must stay in sync between you and your coding agent.
How do I add app.cnvs/whiteboard to my agent?
Add the Streamable HTTP MCP remote from the registry entry to Claude Code, Cursor, or any MCP 2025-06-18 client, then invoke tools like open_board and get_board; authentication is none per publisher metadata.