Excalidraw Mcp

Lets an assistant create, connect, delete, and read nodes and edges in a local Excalidraw diagram file.

What you can do

This MCP server works on a single Excalidraw diagram file given at startup. Its tools create a node (a shape with a label) and return its ID, create an arrow between two nodes referenced by ID or label text, delete a node or edge by ID or label, and return a markdown representation of the whole diagram including nodes, relationships, labels, frames, and colors.

When to use it

Useful when you want an assistant to build or edit a diagram file directly, for example sketching architecture or flow diagrams as nodes and arrows, or reading an existing diagram back as markdown for review.

Requirements

Runs locally over stdio as an npm package, so Node.js v18.0.0 or newer is needed. The diagram file path must be passed with the required --diagram option. No accounts, API keys, or environment variables are declared.