Introducing Excaliclaw: A Skill for OpenClaw to Generate Excalidraw Diagrams

This article describes the development of Excaliclaw, a custom skill for OpenClaw that generates Excalidraw diagrams. The author explains the challenge of integrating the Excalidraw MCP server with OpenClaw, which doesn't render MCP UI natively. Through iterative debugging, they solved issues like empty exports, missing labels, font rendering, and arrow routing. The final skill packages reliable patterns including explicit text elements, proper draw order, and Excalifont usage. The article includes technical details about MCP transport configuration, diagram element sizing, and export payload requirements. It concludes with installation instructions for the Excaliclaw skill via OpenClaw.