mermaid_expert_skill

Overview

This skill provides expert guidance for Mermaid.js, the text-to-diagram library for creating flowcharts, sequence diagrams, class diagrams, state machines, Gantt charts, git graphs, and block diagrams. It helps you write correct Mermaid syntax, choose appropriate diagram types, and produce clear, embeddable visuals for documentation and presentations. The guidance covers basic syntax, advanced features, integrations, CLI usage, and practical design tips.

How this skill works

I inspect your diagram goal and suggest the best Mermaid diagram type and minimal, valid syntax to implement it. I can generate ready-to-render Mermaid code blocks, recommend configuration and rendering options (browser, CLI, or build pipelines), and provide validation/debug steps when syntax fails. I also advise on styling, subgraphs, and performance techniques for rendering many diagrams in web apps.

When to use it

• You need a quick, maintainable diagram for docs, READMEs, or wiki pages.
• You want to convert process descriptions or user flows into visual flowcharts or state diagrams.
• You are modeling interactions over time with sequence diagrams.
• You need project timelines or milestones visualized with Gantt charts.
• You want to explain architecture via class diagrams, block diagrams, or git graphs.

Best practices

• Keep diagrams focused: limit to ~15–20 nodes for readability; split large flows into subgraphs.
• Prefer top-to-bottom or left-to-right flow for flowcharts to improve comprehension.
• Use clear labels and short text; annotate complex parts with notes rather than long node text.
• Initialize Mermaid once and render on demand to improve performance in single-page apps.
• Validate syntax with mermaid-cli or a quick render to catch errors early.

Example use cases

• Documenting user authentication flow as a flowchart embedded in project docs.
• Showing API call lifecycles with a sequence diagram in engineering design reviews.
• Mapping domain models and relationships using class diagrams for architecture docs.
• Visualizing order-processing states and transitions with a state diagram for QA.
• Creating a Gantt chart of a feature roadmap for product planning and stakeholder updates.