Excalidraw MCP Sentinel

Hardened, self-hosted Excalidraw MCP server with SQLite persistence, multi-tenancy, auto-sync, and production-grade security. Version 1.0.6, monthly releases. Forks upstream (mcp_excalidraw) and adds 446 tests, Helmet, CORS, rate limiting, WebSocket challenge-response auth, and Docker hardening. Runs entirely locally without excalidraw.com. Supports 32 MCP tools, 3-tier rate limiting, and isolated workspaces. Requires Node >=20.