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mermaid-diagrams

Generate Mermaid diagrams for architecture, data flows, and sequences.

Updated Apr 12, 2026
Search Tags:#architecture#mermaid#flowchart#generate#diagram#c4#sequence-diagram
One-click install
npx skills add https://github.com/davidrrowley/CortexYouV3 --skill mermaid-diagrams-davidrrowley
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mermaid-diagrams
Source: https://github.com/davidrrowley/CortexYouV3/tree/main/.agents/skills/mermaid-diagrams
Command: npx skills add https://github.com/davidrrowley/CortexYouV3 --skill mermaid-diagrams-davidrrowley

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Creating accurate, consistent, and renderable technical diagrams by hand is time-consuming and error-prone; this Skill codifies best practices, syntax rules, and diagram templates so teams can produce production-quality Mermaid diagrams quickly and reliably.

Core Features & Use Cases

  • Multi-format coverage: Ready-to-render guidance and patterns for C4 context and container diagrams, sequence diagrams, flowcharts, ER diagrams, state machines, class diagrams, git graphs, and Gantt charts.
  • Syntax & convention enforcement: Clear rules for node IDs, label quoting, comment style, titles, subgraphs for trust boundaries, and recommended node shapes to avoid common rendering errors.
  • Practical examples and mistakes: Templates and annotated examples for common architecture scenarios (order processing, payment flows, async event chains) and a checklist of frequent mistakes to fix before rendering.
  • Use Cases: Architecture documentation, design reviews, runbook visuals, API callflows, database schema diagrams, and release branch visualizations.

Quick Start

Create a C4 Container diagram for an Order Management System showing web, API, database, worker, message queue, and external payment gateway and return only the Mermaid code.

Frequently Asked Questions about mermaid-diagrams

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

FAQPage Schema
How do I generate a Mermaid sequence diagram for an API callflow?▼

To generate a Mermaid sequence diagram for an API callflow, you describe the interactions and receive valid Mermaid syntax using idiomatic constructs for async and sequence flows, proper titles, and alphanumeric node IDs.

What is the best way to create a C4 container diagram for an Order Management System?▼

Creating a C4 container diagram for an Order Management System involves defining components like web, API, database, and message queues, which the generator outputs as valid Mermaid syntax using subgraphs for trust boundaries.

Why does my Mermaid flowchart fail to render with special characters in node labels?▼

Mermaid flowcharts fail to render with special characters in node labels if labels are not properly quoted; enforcing quoted labels for special characters and alphanumeric node IDs prevents common rendering errors.

Can I use Mermaid to visualize database schema and entity relationships?▼

Yes, you can use Mermaid to visualize database schema and entity relationships by generating ER diagrams that apply syntax rules and recommended node shapes for production-quality architecture documentation.

Does this approach support visualizing release branches and git workflows?▼

Yes, this approach supports visualizing release branches and git workflows by generating gitGraph scenarios using valid Mermaid syntax, proper titles, and %% comments for reliable technical documentation.

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