mermaid-diagram

Create syntactically valid Mermaid diagrams across seven diagram types.

Updated Mar 5, 2026

Search Tags:#documentation #mermaid #flowchart #diagramming #diagrams #class-diagram #sequence-diagram

Ready to run

npx skills add https://github.com/johwer/marketplace --skill mermaid-diagram-johwer

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: mermaid-diagram
Source: https://github.com/johwer/marketplace/tree/main/skills/mermaid-diagram
Command: npx skills add https://github.com/johwer/marketplace --skill mermaid-diagram-johwer

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Mermaid diagram authors often struggle to produce syntactically valid diagrams and to avoid common pitfalls such as special characters in labels, subgraph syntax, incorrect note usage, and reserved words.

Core Features & Use Cases

Diagram correctness across multiple types: flowchart, sequenceDiagram, classDiagram, stateDiagram, erDiagram, gantt, mindmap.
Error prevention and style guidance: follows official specs and avoids common mistakes.
Use case: document architecture, design workflows, and visualizing processes with confidence.

Quick Start

Use mermaid to draft a basic flowchart for a user onboarding flow.

Frequently Asked Questions about mermaid-diagram

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

FAQPage Schema

How do I create error-free mermaid diagrams for documentation?▼

To create error-free mermaid diagrams, enforce official syntax and avoid common pitfalls like special characters in labels or incorrect subgraph syntax. This ensures valid flowcharts, sequence diagrams, and class diagrams render correctly in your docs.

Why does my mermaid flowchart fail to render due to syntax errors?▼

Mermaid flowcharts often fail due to special characters in labels, incorrect subgraph syntax, or reserved words. Following official specs and using ready-to-use structures prevents these common diagramming mistakes.

What types of mermaid diagrams can I use to document software architecture?▼

You can document software architecture using multiple mermaid diagram types, including flowchart, sequenceDiagram, classDiagram, stateDiagram, erDiagram, gantt, and mindmap to visualize processes and designs.

Can I use mermaid class diagrams and sequence diagrams in the same documentation?▼

Yes, you can use mermaid class diagrams and sequence diagrams together in documentation. The syntax supports multiple diagram types, allowing you to accurately document both static structures and dynamic workflows.

What is the best way to avoid reserved word errors in mermaid diagrams?▼

The best way to avoid reserved word errors in mermaid diagrams is to strictly follow official syntax rules and apply style guidance. Using validated structures prevents incorrect note usage and reserved word conflicts.

How do I draft a basic mermaid flowchart for a user onboarding process?▼

To draft a basic mermaid flowchart for user onboarding, use official flowchart syntax and ready-to-use structures. This guides formatting and ensures the diagram accurately visualizes the workflow without errors.