Architecture Diagram Agent Skill

by HezaoHezao

Dark-themed SVG architecture/cloud/infra diagrams as HTML.

1k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

117

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/HezaoHezao/poirot --skill architecture-diagram

The instruction itself

15 sections, as written by the author

Architecture Diagram

Overview

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 → use concept-diagrams
Floor plans, educational visuals → use concept-diagrams
Hand-drawn sketches → use excalidraw

Workflow

User describes their system architecture (components, connections,

technologies)

Generate the HTML file following the design system below
Save with write_file to a .html file
User opens in any browser — works offline, no dependencies

write_file("architecture.html", "<full HTML with inline SVG + CSS>")

Output Location

# Default to current working directory
./[project-name]-architecture.html

Design System

Aesthetic

Dark background: deep navy or black (#0a0a1a, #111)
Grid pattern: subtle dot or line grid in background
Neon accents: luminous colors for different component types
Monospace labels: for technical authenticity
Rounded corners: on boxes (rx=6)
Glow effects: subtle box-shadow on key components

Color Palette

:root {
  --bg: #0a0a1a;
  --grid: #1a1a2e;

  /* Component types */
  --c-frontend: #00D9FF;    /* cyan */
  --c-backend: #50C878;     /* green */
  --c-database: #F5A623;    /* orange */
  --c-external: #C4A7E7;    /* purple */
  --c-queue: #FF6B6B;       /* red */
  --c-cache: #FFD700;       /* gold */

  --text: #E0E0E0;
  --text-dim: #888;
  --border: #333;
}

SVG Template

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Architecture Diagram</title>
<style>
  body {
    margin: 0; padding: 40px;
    background: var(--bg);
    background-image: radial-gradient(circle, var(--grid) 1px, transparent 1px);
    background-size: 30px 30px;
  }
  svg { display: block; margin: 0 auto; }
  .component {
    stroke-width: 2; rx: 6; ry: 6;
    fill-opacity: 0.1;
  }
  .label {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 13px; fill: var(--text);
  }
  .label-type {
    font-size: 10px; fill: var(--text-dim);
    text-transform: uppercase; letter-spacing: 1px;
  }
  .connection {
    stroke: var(--text-dim); stroke-width: 1.5;
    fill: none; stroke-dasharray: 4 2;
    marker-end: url(#arrow);
  }
</style>
</head>
<body>
<svg width="1000" height="700" viewBox="0 0 1000 700">
  <defs>
    <marker id="arrow" markerWidth="8" markerHeight="6" refX="8" refY="3" orient="auto">
      <path d="M0,0 L8,3 L0,6 Z" fill="var(--text-dim)"/>
    </marker>
  </defs>

  <!-- Frontend Layer -->
  <rect class="component" x="50" y="50" width="200" height="80"
        stroke="var(--c-frontend)" fill="var(--c-frontend)"/>
  <text class="label" x="150" y="85" text-anchor="middle">Web App</text>
  <text class="label-type" x="150" y="105" text-anchor="middle">Frontend</text>

  <!-- Backend Layer -->
  <rect class="component" x="400" y="50" width="200" height="80"
        stroke="var(--c-backend)" fill="var(--c-backend)"/>
  <text class="label" x="500" y="85" text-anchor="middle">API Server</text>
  <text class="label-type" x="500" y="105" text-anchor="middle">Backend</text>

  <!-- Database Layer -->
  <rect class="component" x="750" y="50" width="200" height="80"
        stroke="var(--c-database)" fill="var(--c-database)"/>
  <text class="label" x="850" y="85" text-anchor="middle">PostgreSQL</text>
  <text class="label-type" x="850" y="105" text-anchor="middle">Database</text>

  <!-- Connections -->
  <path class="connection" d="M 250 90 L 400 90"/>
  <path class="connection" d="M 600 90 L 750 90"/>
</svg>
</body>
</html>

Diagram Patterns

Layered Architecture

Frontend (top) → Backend (middle) → Database (bottom)
Horizontal layers with vertical connections

Microservice Topology

Central API gateway + surrounding services
Bidirectional connections for sync, one-way for async

Cloud Infrastructure

VPC as a large container box
Subnets as inner boxes
Managed services as icons (S3, Lambda, RDS)

Data Flow

Left-to-right flow
Different line styles for sync (solid) vs async (dashed)

Pitfalls

Too many components: keep to 5-10 boxes max. More = unreadable.

Split into multiple diagrams if needed.

Crossing lines: route connections to minimize crossings. Use right-angle

paths.

No legend: if using color-coded component types, include a legend.
Font sizing: labels must be readable. 13px minimum for component names.

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How to use it

Copy the folder

Take hezaohezao/architecture-diagram from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.