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mermaid-diagrams

Create and validate portable Mermaid diagrams for architecture and process documentation.

86|9|Updated Jun 5, 2026
Search Tags:#pdf#mermaid#rendering#flowchart#sequence#diagrams#c4
One-click install
npx skills add https://github.com/magnus919/hermes-profiles --skill mermaid-diagrams-magnus919
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mermaid-diagrams
Source: https://github.com/magnus919/hermes-profiles/tree/main/skills/mermaid-diagrams
Command: npx skills add https://github.com/magnus919/hermes-profiles --skill mermaid-diagrams-magnus919

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires mermaid, and includes scripts (resource) and references (resource) components.

What problem does it solve?

Diagram authors need a portable, platform-agnostic way to create, render, and validate Mermaid diagrams that can be embedded in Markdown, HTML, PDFs, or CLI pipelines without relying on a single rendering engine.

Core Features & Use Cases

  • Generates valid Mermaid syntax for flowcharts, sequences, C4 approximations, class/state/ER diagrams, Gantt and block diagrams.
  • Renders diagrams via mermaid-cli or CDN, with pre-validation to catch syntax errors before output.
  • Supports rendering in Markdown, HTML, PDF workflows and agent-focused contexts; includes a reference gallery in the repository to cover common layout constraints and PDF-optimized workflows.

Quick Start

Invoke the validation script on a .mmd file and render the diagram to SVG or PDF using Mermaid CLI for integration into your docs.

Frequently Asked Questions about mermaid-diagrams

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

FAQPage Schema
How do I render Mermaid diagrams in PDF pipelines without a browser rendering engine?▼

You can render Mermaid diagrams in PDF pipelines by using mermaid-cli to pre-render syntax into SVG files, which can then be embedded directly into your PDF documents without relying on a live browser engine.

Can I validate Mermaid syntax before embedding flowcharts in Markdown reports?▼

Yes, you can run a validation script on your .mmd files to catch syntax errors in flowcharts and sequence diagrams before embedding the pre-rendered SVG outputs into Markdown reports.

Does this approach support generating C4 and ER diagrams for architecture documentation?▼

Generating C4 approximations and ER diagrams for architecture documentation is fully supported, alongside flowcharts, sequences, class, state, Gantt, and block diagrams for process documentation.

What is the best way to embed pre-rendered Mermaid SVGs in HTML reports?▼

The best way to embed Mermaid SVGs in HTML reports is to validate the diagram syntax first, then use mermaid-cli to render the output to an SVG file and reference it directly within your HTML.

Are there limitations when using Mermaid CLI for cross-environment diagram rendering?▼

Cross-environment diagram rendering limitations include layout constraints in complex diagrams, but you can navigate these using the provided reference gallery which covers common layout constraints and PDF-optimized workflows.

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