What is architecture-diagrams?

A guide for creating architecture diagrams with Mermaid, PlantUML, the C4 model, flowcharts, and sequence diagrams. These are text-based ways to show how software parts, data, and interactions fit together.

Documenting services and components, data flows, request sequences, deployments, infrastructure, microservices, integrations, and database structures.

It helps turn a complex system into a maintainable visual explanation that developers can update alongside the system design.

architecture-diagrams — Skill for Claude Code and Codex by aj-geddes

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add aj-geddes/useful-ai-prompts --skill architecture-diagrams

Clone the repo

git clone --depth 1 https://github.com/aj-geddes/useful-ai-prompts

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/architecture-diagrams/github.svg)](https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/architecture-diagrams)

Your own site

<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/architecture-diagrams"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/architecture-diagrams/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/architecture-diagrams"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/architecture-diagrams.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 689 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

Socket pass 14 Sept 2026
Snyk pass 14 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00041	$0.00689
Opus 5.5	$0.00016	$0.00276
Sonnet 5.5	$0.00008	$0.00138
Haiku 4.5	$0.00004	$0.00069

Measured 2mo ago against content hash 3896b896423c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

architecture-diagrams scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/validate-schema.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

architecture-diagrams — 89% identical, 12 lines differ

skills/architecture-diagrams/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Overview

Create clear, maintainable architecture diagrams using code-based diagramming tools like Mermaid and PlantUML for system design, data flows, and technical documentation.

When to Use

System architecture documentation
C4 model diagrams
Data flow diagrams
Sequence diagrams
Component relationships
Deployment diagrams
Infrastructure architecture
Microservices architecture
Database schemas (visual)
Integration patterns

Quick Start

Minimal working example:

graph TB
    subgraph "Client Layer"
        Web[Web App]
        Mobile[Mobile App]
        CLI[CLI Tool]
    end

    subgraph "API Gateway Layer"
        Gateway[API Gateway<br/>Rate Limiting<br/>Authentication]
    end

    subgraph "Service Layer"
        Auth[Auth Service]
        User[User Service]
        Order[Order Service]
        Payment[Payment Service]
        Notification[Notification Service]
    end

    subgraph "Data Layer"
        UserDB[(User DB<br/>PostgreSQL)]
        OrderDB[(Order DB<br/>PostgreSQL)]
        Cache[(Redis Cache)]
        Queue[Message Queue<br/>RabbitMQ]
    end
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Guide	Contents
System Architecture Diagram	System Architecture Diagram
Sequence Diagram	Sequence Diagram
C4 Context Diagram	C4 Context Diagram
Component Diagram	Component Diagram
Deployment Diagram	Deployment Diagram
Data Flow Diagram	Data Flow Diagram
Class Diagram	Class Diagram
Component Diagram	Component Diagram
Deployment Diagram	Deployment Diagram

Read the full file on GitHub · 111 lines

Files

What ships with it

11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 111 lines · 41 tokens per session scan A 3896b896423c

Subscribe to this mod's changes

architecture-diagrams is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (376 stars, last pushed 8mo ago), licensed MIT. It adds 41 tokens to every session and 689 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Planning Writing and docs

architecture-diagrams next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
architecture-diagramsaj-geddes/useful-ai-prompts	Skill	376	8mo ago	MIT	A	41	Claude Code, Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code

architecture-diagrams