MCP Excalidraw 🔌 MCP server Open source

What it is

MCP Excalidraw is a community open-source toolkit by yctimlin that lets AI agents create, edit and export diagrams on a live Excalidraw canvas. The agent can draw a diagram, take a screenshot to check it, fix the layout and save an .excalidraw file. It suits explainer graphics, flowcharts and hand-drawn-style illustrations for posts and slides.

Key features

• Element create, read, update and delete
• Layout tools: align, distribute and group
• Scene description and screenshots so the agent can check its work
• File import and export, including .excalidraw files
• Snapshots and viewport control
• 26 tools, plus a CLI and REST API

How to install

The README installs the companion Agent Skill with npx -y mcp-excalidraw-server install-skill --dir <skills-root> and documents MCP configs for Claude Code, Claude Desktop, Cursor, Codex CLI, OpenCode and Antigravity. The live canvas runs as a local web app that the server talks to.

Pricing and rights

Free and MIT-licensed; Excalidraw itself is open source. Diagrams you make are yours. The v2.0 release targets the 2026-07-28 MCP protocol version.

Who it is for

Bloggers, educators and presenters who want clean diagrams and flowcharts made by an assistant, and developers documenting systems. Teams that keep diagrams in a repository benefit from the .excalidraw export, since diagrams can be versioned and edited later by hand.

Verdict

A capable, maintained diagramming server with a useful screenshot-and-fix loop. It is a community project that needs a local canvas running, and it makes diagrams, not polished marketing graphics.