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mcp/harbor
Claude Code

napkin for Claude Code

io.github.sshwarts/napkin

Shared visual canvas (Excalidraw) for collaborative whiteboarding between AI agents and humans.

client:Claude Code transport:stdio runtime:npm

Install napkin in Claude Code

run in your project directory

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

claude mcp add napkin -e ANTHROPIC_API_KEY=<ANTHROPIC_API_KEY> -- npx -y napkin-mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

napkin in other clients

napkin MCP server