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mermaid-builder

Generate syntactically valid Mermaid diagrams for flowcharts, sequence, class, state, Gantt, ER, and data lineage.

47|11|Updated Nov 26, 2025
Search Tags:#mermaid#flowchart#sequence#diagram#er diagram
One-click install
npx skills add https://github.com/majesticlabs-dev/majestic-marketplace --skill mermaid-builder
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mermaid-builder
Source: https://github.com/majesticlabs-dev/majestic-marketplace/tree/main/plugins/majestic-engineer/skills/mermaid-builder
Command: npx skills add https://github.com/majesticlabs-dev/majestic-marketplace --skill mermaid-builder

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Helps produce correct, readable Mermaid diagrams for flowcharts, sequences, ER diagrams, and more, with a strong emphasis on label quoting and structure.

Core Features & Use Cases

  • Label Quoting Rule: always quote labels with spaces or special chars
  • Minimal to advanced diagram types: flowchart, sequence, class, ER, etc.
  • Quick references and examples for many diagram types
  • Validation patterns to ensure diagrams render correctly

Quick Start

Provide the diagram type and content; the builder returns syntactically valid Mermaid code ready to render.

Frequently Asked Questions about mermaid-builder

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

FAQPage Schema
How do I create a syntactically correct Mermaid flowchart?▼

Mermaid flowcharts require properly quoted labels (use quotes for spaces or special characters), correct arrow syntax, and valid node definitions. Provide your diagram structure and the builder generates syntactically valid code ready to render.

What Mermaid diagram types can I generate?▼

Mermaid supports flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, ER diagrams, and data lineage visualizations. The builder enforces syntax rules and best-practice conventions for each type.

Why do my Mermaid labels with spaces keep failing?▼

Mermaid requires labels containing spaces or special characters to be quoted. The builder enforces this label quoting rule automatically, preventing render errors from unquoted multi-word labels.

Can I use subgraphs and validation checks in my Mermaid diagrams?▼

Yes. The builder supports subgraphs for modularization and includes validation patterns to ensure diagrams render correctly. It provides guidance on structure, labeling, and styling across all diagram types.

How do I ensure my ER diagram or sequence diagram follows Mermaid conventions?▼

The builder enforces Mermaid syntax rules and best-practice conventions for ER diagrams, sequence diagrams, and all other supported types. Provide your diagram content and receive validated, ready-to-render code.

Do I need prior knowledge of Mermaid syntax to generate diagrams?▼

No. You describe the diagram type and content; the builder handles syntax validation and formatting. Quick references and examples guide label quoting, arrow syntax, and diagram-specific structure.

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