/architecture-diagram

name: architecture-diagram
description: "Dark-themed SVG architecture/cloud/infra diagrams as HTML."
version: 1.0.0
author: Cocoon AI (hello@cocoon-ai.com), ported by Hermes Agent
license: MIT
dependencies: []
metadata:
  hermes:
    tags: [architecture, diagrams, SVG, HTML, visualization, infrastructure, cloud]
    related_skills: [concept-diagrams, excalidraw]
origin: adapted
source_repo: cocoon-ai/architecture-diagram-skill
source_url: https://cocoon-ai.com
source_license: MIT
language: en

Architecture Diagram Skill

Generate professional, dark-themed technical architecture diagrams as standalone HTML files with inline SVG graphics. No external tools, no API keys, no rendering libraries — just write the HTML file and open it in a browser.

Scope

**Best suited for:**

• Software system architecture (frontend / backend / database layers)
• Cloud infrastructure (VPC, regions, subnets, managed services)
• Microservice / service-mesh topology
• Database + API map, deployment diagrams
• Anything with a tech-infra subject that fits a dark, grid-backed aesthetic

**Look elsewhere first for:**

• Physics, chemistry, math, biology, or other scientific subjects
• Physical objects (vehicles, hardware, anatomy, cross-sections)
• Floor plans, narrative journeys, educational / textbook-style visuals
• Hand-drawn whiteboard sketches (consider `excalidraw`)
• Animated explainers (consider an animation skill)

If a more specialized skill is available for the subject, prefer that. If none fits, this skill can also serve as a general SVG diagram fallback — the output will just carry the dark tech aesthetic described below.

Based on [Cocoon AI's architecture-diagram-generator](https://github.com/Cocoon-AI/architecture-diagram-generator) (MIT).

Workflow

1. User describes their system architecture (components, connections, technologies) 2. Generate the HTML file following the design system below 3. Save with `write_file` to a `.html` file (e.g. `~/architecture-diagram.html`) 4. User opens in any browser — works offline, no dependencies

Output Location

Save diagrams to a user-specified path, or default to the current working directory:

./[project-name]-architecture.html

Preview

After saving, suggest the user open it:

# macOS
open ./my-architecture.html
# Linux
xdg-open ./my-architecture.html

Design System & Visual Language

Color Palette (Semantic Mapping)

Use specific `rgba` fills and hex strokes to categorize components:

| Component Type | Fill (rgba) | Stroke (Hex) | | :--- | :--- | :--- | | **Frontend** | `rgba(8, 51, 68, 0.4)` | `#22d3ee` (cyan-400) | | **Backend** | `rgba(6, 78, 59, 0.4)` | `#34d399` (emerald-400) | | **Database** | `rgba(76, 29, 149, 0.4)` | `#a78bfa` (violet-400) | | **AWS/Cloud** | `rgba(120, 53, 15, 0.3)` | `#fbbf24` (amber-400) | | **Security** | `rgba(136, 19, 55, 0.4)` | `#fb7185` (rose-400) | | **Message Bus** | `rgba(251, 146, 60, 0.3)` | `#fb923c` (orange-400) | | **External** | `rgba(30, 41, 59, 0.5)` | `#94a3b8` (slate-400) |

Typography & Background

• **Font:** JetBrains Mono (Monospace), loaded from Google Fonts
• **Sizes:** 12px (Names), 9px (Sublabels), 8px (Annotations), 7px (Tiny labels)
• **Background:** Slate-950 (`#020617`) with a subtle 40px grid pattern

<!-- Background Grid Pattern -->
<pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse">
  <path d="M 40 0 L 0 0 0 40" fill="none" stroke="#1e293b" stroke-width="0.5"/>
</pattern>

Technical Implementation Details

Component Rendering

Components are rounded rectangles (`rx="6"`) with 1.5px strokes. To prevent arrows from showing through semi-transparent fills, use a **double-rect masking technique**: 1. Draw an opaque background rect (`#0f172a`) 2. Draw the semi-transparent styled rect on top

Connection Rules

• **Z-Order:** Draw arrows *early* in the SVG (after the grid) so they render behind component boxes
• **Arrowheads:** Defined via SVG markers
• **Security Flows:** Use dashed lines in rose color (`#fb7185`)
• **Boundaries:**
• *Security Groups:* Dashed (`4,4`), rose color
• *Regions:* Large dashed (`8,4`), amber color, `rx="12"`

Spacing & Layout Logic

• **Standard Height:** 60px (Services); 80-120px (Large components)
• **Vertical Gap:** Minimum 40px between components
• **Message Buses:** Must be placed *in the gap* between services, not overlapping them
• **Legend Placement:** **CRITICAL.** Must be placed outside all boundary boxes. Calculate the lowest Y-coordinate of all boundaries and place the legend at least 20px below it.

Document Structure

The generated HTML file follows a four-part layout: 1. **Header:** Title with a pulsing dot indicator and subtitle 2. **Main SVG:** The diagram contained within a rounded border card 3. **Summary Cards:** A grid of three cards below the diagram for high-level details 4. **Footer:** Minimal metadata

Info Card Pattern

<div class="card">
  <div class="card-header">
    <div class="card-dot cyan"></div>
    <h3>Title</h3>
  </div>
  <ul>
    <li>• Item one</li>
    <li>• Item two</li>
  </ul>
</div>

Output Requirements

• **Single File:** One self-contained `.html` file
• **No External Dependencies:** All CSS and SVG must be inline (except Google Fonts)
• **No JavaScript:** Use pure CSS for any animations (like pulsing dots)
• **Compatibility:** Must render correctly in any modern web browser

Template Reference

Load the full HTML template for the exact structure, CSS, and SVG component examples:

skill_view(name="architecture-diagram", file_path="templates/template.html")

The template contains working examples of every component type (frontend, backend, database, cloud, security), arrow styles (standard, dashed, curved), security groups, region boundaries, and the legend — use it as your structural reference when generating diagrams.