Server data from the Official MCP Registry
Zero-auth real-time collaborative whiteboard with MCP — AI agents + humans edit the same board live.
Zero-auth real-time collaborative whiteboard with MCP — AI agents + humans edit the same board live.
Remote endpoints: streamable-http: https://cnvs.app/mcp
Valid MCP server (2 strong, 1 medium validity signals). 2 known CVEs in dependencies (0 critical, 2 high severity) Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.
10 tools verified · Open access · 3 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
This plugin requests these system permissions. Most are normal for its category.
Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"app-cnvs-whiteboard": {
"url": "https://cnvs.app/mcp"
}
}
}From the project's GitHub README.
Agent Skills + MCP server discovery for cnvs.app — the free, no-signup real-time collaborative whiteboard. Any AI agent can read, write, draw, diagram, and subscribe to live human edits on a shared canvas, either through the hosted MCP server or the REST fallback.
Works with Claude Code, Claude Desktop, Cursor, OpenCode / OpenAI Codex, Aider (with MCP plugin), any other MCP-speaking client, and Hermes-family agents.
Endpoint: https://cnvs.app/mcp (Streamable HTTP, protocol 2025-06-18, no auth — the board ID is the access key).
Registered in the official MCP Registry as app.cnvs/whiteboard.
open_board, get_board, get_preview, add_text, add_link, add_image, draw_stroke, move, erase, wait_for_update. All ten have 1:1 REST mirrors at https://cnvs.app/api/boards/<id>/… for runtimes that can't speak MCP.cnvs://board/{id}/state.json (full snapshot, subscribable) and cnvs://board/{id}/preview.svg (visual render, subscribable).resources/subscribe supported with notifications/resources/updated pushed over SSE, debounced ~3 s after activity settles./quotas.json, /openapi.json, /llms.txt, /.well-known/mcp.json, /.well-known/mcp/server.json.One-line config — add this to your client's mcpServers object:
{
"mcpServers": {
"cnvs": {
"type": "http",
"url": "https://cnvs.app/mcp"
}
}
}
claude mcp add --transport http cnvs https://cnvs.app/mcp
# Create a board
curl -X POST https://cnvs.app/api/boards
# Add text
curl -X POST https://cnvs.app/api/boards/<id>/texts \
-H 'Content-Type: application/json' \
-d '{"x":100,"y":200,"content":"# Hello","author":"ai:myagent"}'
# Long-poll for live changes
curl "https://cnvs.app/api/boards/<id>/wait?timeout_ms=25000"
Full REST reference: /llms.txt, /openapi.json.
Two related Agent Skills live in this repo, published under the agentskills.io open standard so they work in any compatible runtime. Install them into ~/.claude/skills/ to teach the agent how to use the MCP server well (preview-before-JSON, REST-over-MCP for writes, author-tag conventions, subscription-then-react loop).
cnvs-whiteboard/ — PRIMARYTeaches an AI agent how to collaborate on a cnvs.app board in real time:
Activates on any cnvs.app board reference (URL https://cnvs.app/#<id>, cnvs://board/<id>/..., or a bare board ID) or phrases like "collaborate on / draw / diagram / annotate / watch a shared whiteboard or canvas."
mcp-listen/ — GENERICPush-to-model pump for any Streamable-HTTP MCP server with subscriptions. Opens a session, subscribes to the given resource URIs, and emits one JSON line per notifications/resources/updated event on stdout — designed to be wrapped by Claude Code's Monitor tool so every server push becomes an in-chat notification (no polling, no log tailing).
Not cnvs-specific. Works against file watchers, remote queues, task runners, anything exposing resources/subscribe over MCP. cnvs-whiteboard delegates its push channel here.
# cnvs-whiteboard (SKILL.md only — no deps)
mkdir -p ~/.claude/skills/cnvs-whiteboard && cd ~/.claude/skills/cnvs-whiteboard
curl -O https://cnvs.app/cnvs-whiteboard/SKILL.md
# mcp-listen (SKILL.md + scripts/ + npm install)
mkdir -p ~/.claude/skills/mcp-listen && cd ~/.claude/skills/mcp-listen
curl -O https://cnvs.app/mcp-listen/SKILL.md \
-O https://cnvs.app/mcp-listen/package.json \
--create-dirs -o scripts/listen.mjs https://cnvs.app/mcp-listen/scripts/listen.mjs
npm install
Alternatively git clone this repo and cp -r .claude/skills/* ~/.claude/skills/ — the .claude/skills/ directory contains symlinks into cnvs-whiteboard/ and mcp-listen/ for Claude Code's expected layout.
Both skills follow the agentskills.io spec:
name matches the containing directory namedescription under 1024 characters, imperative phrasing, explicit trigger keywordsscripts/ subdirectory for bundled code (mcp-listen)license: MIT, compatibility field declared, cross-references in each skill's "Related skills" section to prevent activation overlapEarlier versions had a single page (/skill-cnvs.md on cnvs.app — now a legacy redirect). Splitting into two coherent units follows the spec's "design coherent units" best practice:
cnvs-whiteboard owns the cnvs.app-specific workflow (read / write / render / gotchas).mcp-listen owns the generic push-to-model pattern (usable against any MCP server).Cross-references keep them pairing cleanly: cnvs-whiteboard mentions mcp-listen as its delegated push channel; mcp-listen mentions cnvs-whiteboard as the companion for cnvs-specific work. No activation overlap in practice.
Skills are also served live at:
https://cnvs.app/cnvs-whiteboard/SKILL.mdhttps://cnvs.app/mcp-listen/SKILL.mdhttps://cnvs.app/mcp-listen/scripts/listen.mjshttps://cnvs.app/mcp-listen/package.jsonThe cnvs.app URLs are the canonical install targets for curl-based installers; this GitHub repo is the reference for aggregators that crawl public sources (skills.sh, etc.) and for users who prefer git clone.
app.cnvs/whiteboard — browse/.well-known/mcp.json — links both skills/.well-known/mcp/server.json — MCP Registry entry with publisher-provided _meta.skills[]/llms.txt — LLM-friendly full referencedaymade/claude-code-skills, majiayu000/claude-skill-registry (submitted)MIT. See LICENSE.
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