This one makes Claude proactively suggest Mermaid diagrams when you're explaining systems, APIs, database schemas, or workflows. It includes a decision tree for picking the right diagram type (flowchart vs sequence vs ER vs class), syntax quick references for nodes and edges, and real examples like API request flows and state machines. The diagrams render natively in GitHub, GitLab, VS Code, and Obsidian, which is handy if you're already documenting there. It's opinionated about best practices like using meaningful labels and keeping diagrams focused. Good for architecture discussions or design docs where a visual would clarify things faster than another wall of text.
npx skills add https://github.com/ccheney/robust-skills --skill mermaid-diagrams