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mermaid-diagram

Generate syntactically correct Mermaid diagrams for flowcharts, sequence, and class diagrams.

Updated Dec 22, 2025
Search Tags:#documentation#mermaid#syntax#flowchart#visualization#diagrams
One-click install
npx skills add https://github.com/royhenengel/Claude-Customizations --skill mermaid-diagram-royhenengel
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mermaid-diagram
Source: https://github.com/royhenengel/Claude-Customizations/tree/main/skills/Documentation/diagrams-builder/references/mermaid-diagram
Command: npx skills add https://github.com/royhenengel/Claude-Customizations --skill mermaid-diagram-royhenengel

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill prevents common errors and ensures syntactically correct Mermaid diagrams, saving you time debugging and iterating on visual representations.

Core Features & Use Cases

  • Syntax Validation: Adheres to official Mermaid specifications, avoiding pitfalls like special characters in labels, incorrect subgraph syntax, and reserved word misuse.
  • Diagram Type Support: Covers flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, and mindmaps.
  • Use Case: You need to create a flowchart for a new user onboarding process. Use this Skill to generate the Mermaid code, ensuring it's valid and easy to render in your documentation.

Quick Start

Generate a basic flowchart showing a start, a process, and an end, with an arrow from start to process and another from process to end.

Frequently Asked Questions about mermaid-diagram

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I generate valid Mermaid flowcharts without syntax errors?▼

To generate valid Mermaid flowcharts, you need automated syntax validation that prevents common errors like special characters in labels, incorrect subgraph syntax, and reserved word misuse, ensuring the code renders correctly in your documentation.

What types of diagrams can I create using Mermaid syntax?▼

Mermaid syntax supports creating flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, and mindmaps for visual representation in documentation and design files.

Why does my Mermaid diagram break when using special characters in labels?▼

Mermaid diagrams break with special characters because the syntax requires strict adherence to official specifications. Reserved word misuse and unescaped special characters in labels cause parsing errors during diagram rendering.

Can I use Mermaid sequence diagrams for documenting user onboarding processes?▼

Yes, you can use Mermaid sequence diagrams to document user onboarding processes. They map interactions between system components, ensuring syntactically correct visual representations that are easy to render in your documentation.

What is the best way to fix subgraph syntax issues in Mermaid diagrams?▼

The best way to fix subgraph syntax issues is to adhere to official Mermaid specifications, which prevents incorrect subgraph syntax and ensures your diagrams remain valid and easy to render.

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