Skills tagged diagrams: 3 agent skills for Claude Code

• crypto-protocol-diagram — spthy) models and generates Mermaid sequenceDiagrams with cryptographic annotations.
• excalidraw-use — Place existing images onto an Excalidraw whiteboard, turn a slide deck into clean per-slide images first.
• mermaid-tools — Extracts Mermaid diagrams from markdown files and generates high-quality PNG images using bundled scripts.